Gateway device, method for controlling radio transmission, and radio communication system

The present invention relates to a gateway device, a wireless transmission control method, and a wireless communication system using a wireless base station (Base Station: hereinafter, simply referred to as BS) that wirelessly accommodates a wireless terminal (Mobile Subscriber: hereinafter, simply referred to as MS). .. An example of application of a radio base station is an ultra-small radio base station (Femto Base Station: hereinafter, simply referred to as Femto BS).

In recent years, the IEEE802.16 working group has defined a point-to-multipoint (hereinafter simply referred to as P-MP) type communication method in which multiple MSs can be connected to BS.

In addition, the IEEE802.16 Working Group defines two types of applications: the 802.16d specification (802.16-2004) mainly for fixed communication applications and the 802.16e specification (802.16e-2005) for mobile communication applications. There is.

In such wireless communication systems that adopt IEEE 802.11d / e, technologies such as Orthogonal Frequency Division Multiplexing (OFDM) and Orthogonal Frequency Division Multiplexing Access (OFDMA) are used. Mainly adopted.

FIG. 30 is a block diagram showing a schematic configuration inside a wireless communication system adopting IEEE802.16d / e.

The wireless communication system 100 shown in FIG. 30 includes an Internet 101, an Access Service Network (hereinafter, simply referred to as ASN) 104 that accommodates and connects a plurality of BS 103s that wirelessly accommodate a plurality of MS 102s, and an Internet 101. It also has a Connectivity Service Network (hereinafter, simply referred to as CSN) 105 for communicating and connecting between ASN 104 and ASN 104.

Further, in addition to the plurality of BS103s, the ASN104 arranges an ASN gateway (hereinafter, simply referred to as ASN-GW) 106 that controls a communication interface between the CSN105 and the ASN104, and transfers packets at layer 2. In addition, CSN105 routes and forwards packets at layer 3.

In recent years, the development of femto BS, which is a miniaturized version of BS103, has progressed, and femto BS has been placed in general homes and offices where the radio wave environment is not good, and the Internet 101 is provided through an Internet service provider (hereinafter, simply referred to as ISP). A technology for connecting to the ASN104 via communication has been devised.

FIG. 31 is a block diagram showing a schematic configuration inside a wireless communication system using a femto BS. The same configuration as that of the wireless communication system 100 shown in FIG. 30 is designated by the same reference numeral, and the description of the overlapping configuration and operation will be omitted.

The wireless communication system 100A shown in FIG. 31 is provided with a femto BS107 that is arranged in, for example, a general home or office and wirelessly accommodates the MS102.

The femto BS107 connects to the ISP 108 through an asymmetric Digital Subscriber Line (hereinafter, simply referred to as an ADSL line) or an optical fiber line, and communicates with the ASN 104 directly from the ISP 108 or via the Internet 101.

In addition, ASN104 has Femto GW109, which controls the communication interface with Femto BS107 via ISP108 and Internet 101.

The Femto GW109 uses IP security (IP Security: hereinafter simply referred to as IPsec) to realize encrypted communication with the Femto BS107 to prevent data eavesdropping and falsification, ensuring the security of the ASN104.

<nplcit num="1"><text>IEEE Std 802.16TM-2004</text></nplcit><nplcit num="2"><text>IEEE Std 802.16eTM-2005</text></nplcit>

<p> In the conventional wireless communication system 100A, for example, when the femto BS107 is placed in a limited place such as a general household, the MS102 wirelessly accommodated in the femto BS107 is a specific user such as a family member or a visitor of the general household in which the femto BS107 is placed. It will be limited to MS102.</p><p> However, according to the conventional wireless communication system 100A, for example, even though there is no user using the MS102, that is, the MS102 is not in the calling area of the femto BS107, the wireless transmission of the femto BS107 to the MS102 is continued. Therefore, the wireless transmission output may lead to wasteful transmission power waste and unnecessary radio wave interference with adjacent cells.</p><p> The present invention has been made in view of the above points, and one aspect of the present invention is to avoid wasting transmission power or giving interference to adjacent cells.</p>

<p> The disclosure device includes a network connection providing unit that provides a network connection to the wireless terminal wirelessly accommodated in a specific wireless base station among wireless base stations that wirelessly accommodate the wireless terminal for each calling area, and the wireless terminal. When the message is received by the receiving unit and the receiving unit that receives the message related to the movement or location registration, the radio base station in the specific calling area including the calling area of the specific radio base station is wirelessly accommodated. The first terminal presence / absence determination unit that determines whether or not the wireless terminal of the above is lost, and the first terminal presence / absence determination unit determines that the wireless terminal that is wirelessly accommodated in the wireless base station in the specific calling area disappears. If so, it has a command control unit that transmits a transmission stop command for stopping wireless transmission to the wireless terminal to the specific wireless base station.</p><p> The disclosure device includes a network connection providing unit that provides a network connection to a wireless terminal wirelessly accommodated in a specific wireless base station among wireless base stations that wirelessly accommodate the wireless terminal for each calling area, and the wireless terminal. When the receiving unit receives the message related to movement or location registration and the receiving unit receives the message, it is determined whether or not there is the wireless terminal wirelessly accommodated in the wireless base station in the specific calling area. When it is determined by the second terminal presence / absence determination unit and the second terminal presence / absence determination unit that there is the wireless terminal wirelessly accommodated in the wireless base station in the specific calling area, the specific wireless base station is contacted. It also has a command control unit that transmits a transmission restart command for resuming wireless transmission to the wireless terminal.</p><p> The disclosure method includes a network connection providing step of providing a network connection to the wireless terminal wirelessly accommodated in a specific wireless base station among the wireless base stations wirelessly accommodating the wireless terminal for each calling area, and the wireless terminal. When the message is received in the receiving step of receiving the message related to the movement or location registration of the radio, the radio base station in the specific calling area including the calling area of the specific radio base station is wirelessly accommodated. In the first terminal presence / absence determination step for determining whether or not the wireless terminal of the above is lost, and in the first terminal presence / absence determination step, it is determined that the wireless terminal currently being wirelessly accommodated in the wireless base station in the specific calling area disappears. When this is done, a command control step of transmitting a transmission stop command for stopping wireless transmission to the wireless terminal to the specific wireless base station is included.</p><p> The disclosure method includes a network connection providing step of providing a network connection to a wireless terminal wirelessly accommodated in a specific wireless base station among wireless base stations wirelessly accommodating the wireless terminal for each calling area, and the wireless terminal. When a reception step for receiving a message related to movement or location registration and the message are received in the reception step, it is determined whether or not there is the wireless terminal wirelessly accommodated in the wireless base station in the specific calling area. When it is determined in the second terminal presence / absence determination step and the second terminal presence / absence determination step that there is the wireless terminal wirelessly accommodated in the wireless base station in the specific calling area, the specific wireless base station is contacted. A command control step for transmitting a transmission resumption command for resuming wireless transmission to the wireless terminal is included.</p><p> The disclosure system includes a wireless base station that wirelessly accommodates a wireless terminal for each calling area, and a gateway device that provides a network connection to the wireless terminal wirelessly accommodated in a specific wireless base station among the wireless base stations. In the wireless communication system having the above, the gateway device has a receiving unit that receives a message related to the movement or location registration of the wireless terminal, and when the receiving unit receives the message, the specific wireless base station has a receiving unit. The first terminal presence / absence determination unit for determining whether or not the wireless base station in the specific call area including the call area has no wireless terminals currently accommodated, and the first terminal presence / absence determination unit determine the specific call area. When it is determined that the wireless terminal in the wireless base station is no longer accommodated, a command control unit that transmits a transmission stop command to stop wireless transmission to the wireless terminal to the specific wireless base station. When the specific radio base station receives the transmission stop command, the specific radio base station stops radio transmission to the radio terminal.</p><p> The disclosure system includes a wireless base station that wirelessly accommodates a wireless terminal for each calling area, and a gateway device that provides a network connection to the wireless terminal wirelessly accommodated in a specific wireless base station among the wireless base stations. The gateway device has a receiving unit that receives a message related to the movement or location registration of the wireless terminal, and when the receiving unit receives the message, the wireless communication in the specific calling area is provided. The second terminal presence / absence determination unit that determines whether or not the base station has the wireless terminal, and the second terminal presence / absence determination unit that wirelessly accommodates the wireless base station in the specific calling area. When it is determined that there is a terminal, the specific wireless base station has a command control unit that transmits a transmission restart command for resuming wireless transmission to the wireless terminal to the specific wireless base station. When the transmission restart command is received, the wireless transmission to the wireless terminal is restarted.</p>

<p> According to the disclosure device, disclosure method, and disclosure system, a specific radio base station can be controlled by managing and controlling the radio transmission state of the specific radio base station based on the presence or absence of a wireless terminal wirelessly accommodated in the specific radio base station. This has the effect of avoiding unnecessary waste of transmission power or interference with adjacent cells.</p>

<figref num="1">FIG. 1 is a block diagram showing a schematic configuration inside the wireless communication system of this embodiment.</figref><figref num="2">FIG. 2 is a block diagram showing a schematic configuration inside the femto BS.</figref><figref num="3">FIG. 3 is a block diagram showing a schematic configuration inside the femto GW.</figref><figref num="4">FIG. 4 is an explanatory diagram showing the table contents of the neighboring BS list management table inside the femto GW.</figref><figref num="5">FIG. 5 is an explanatory diagram that briefly shows the data structure of the information managed by the location registration database inside the femto GW.</figref><figref num="6">FIG. 6 is a sequence showing the processing operation inside the wireless communication system related to the initial setting of the femto BS.</figref><figref num="7">FIG. 7 is a sequence showing the processing operation inside the wireless communication system accompanying the movement between call groups from the femto BS to another BS by the MS in the idle mode.</figref><figref num="8">FIG. 8 is a sequence showing the processing operation inside the wireless communication system due to the movement between call groups from the BS to the BS near the femto BS by the MS in the idle mode.</figref><figref num="9">FIG. 9 is a flowchart showing the processing operation inside the BS (femto BS) related to the range request reception processing.</figref><figref num="10">FIG. 10 is a flowchart showing the processing operation inside the femto BS related to the access list addition processing.</figref><figref num="11">FIG. 11 is a flowchart showing the processing operation inside the femto BS related to the withdrawal request reception processing.</figref><figref num="12">FIG. 12 is a flowchart showing the processing operation inside the femto BS related to the call notification transmission processing.</figref><figref num="13">FIG. 13 is a flowchart showing the processing operation inside the femto BS related to the location registration range request reception processing.</figref><figref num="14">FIG. 14 is a flowchart showing the processing operation inside the femto GW related to the transmission stop processing.</figref><figref num="15">FIG. 15 is a flowchart showing the processing operation inside the femto BS related to the transmission stop command reception processing.</figref><figref num="16">FIG. 16 is a flowchart showing the processing operation inside the femto GW related to the transmission control processing.</figref><figref num="17">FIG. 17 is a flowchart showing the processing operation inside the femto BS related to the transmission restart command reception processing.</figref><figref num="18">FIG. 18 is a block diagram showing a schematic configuration inside the femto GW of the second embodiment.</figref><figref num="19">FIG. 19 is a block diagram showing a schematic configuration inside the ASN-GW of the second embodiment.</figref><figref num="20">FIG. 20 is a sequence showing the processing operation inside the wireless communication system when the MS starts a new connection to the femto BS.</figref><figref num="21">FIG. 21 is a sequence showing the processing operation inside the wireless communication system due to the transition to the idle mode after the handover associated with the movement between the calling groups from the femto BS to another BS.</figref><figref num="22">FIG. 22 is a sequence showing the processing operation inside the wireless communication system due to the movement between call groups from another BS to the BS near the femto BS.</figref><figref num="23">FIG. 23 is a flowchart showing the processing operation inside the ASN-GW related to the idle transition request reception processing.</figref><figref num="24">FIG. 24 is a flowchart showing the processing operation inside the femto GW related to the transmission stop processing in response to the reception of the position information.</figref><figref num="25">FIG. 25 is a flowchart showing the processing operation inside the ASN-GW related to the location registration request reception processing.</figref><figref num="26">FIG. 26 is a flowchart showing the processing operation inside the femto GW related to the transmission control processing in response to the reception of the position information.</figref><figref num="27">FIG. 27 is a sequence showing the processing operation inside the wireless communication system associated with the handover from the femto BS to another BS.</figref><figref num="28">FIG. 28 is a sequence showing the processing operation inside the wireless communication system associated with the handover from another BS to the femto BS.</figref><figref num="29">FIG. 29 is a flowchart showing the processing operation inside the femto GW related to the transmission control processing in response to the reception of the handover (HO) confirmation notification.</figref><figref num="30">FIG. 30 is a block diagram showing a schematic configuration inside a wireless communication system adopting IEEE802.16d / e.</figref><figref num="31">FIG. 31 is a block diagram showing a schematic configuration inside a wireless communication system using a femto BS.</figref>

Code description

1,1A, 1B wireless communication system 2 MS 3 BS 5 internet 7 Femto BS 8 ISP 11,11A ASN-GW 12,12A Femto GW 13 AAA server 52,52A PC section 53 Pre-movement judgment unit 54 1st connection presence / absence judgment unit 55 Active state judgment unit 56 Command control unit 57 2nd connection presence / absence judgment unit 58 Idle state judgment unit 61 Neighborhood BS list management table 62 Location registration database 63 Femto BS management table

Hereinafter, examples relating to the gateway device, the wireless transmission control method, and the wireless communication system of the present invention will be described in detail with reference to the drawings.

This embodiment is a wireless communication system having a BS that wirelessly accommodates an MS for each calling area and a femto GW that provides a network connection to the MS wirelessly accommodated in the femto BS among the BSs.

When the femto GW receives a message related to the movement or location registration of the MS, if it is determined that the BS in the specific calling area including the calling area of the femto BS will no longer have the MS being wirelessly accommodated, the femto GW will contact the femto BS. Send a transmission stop command to stop wireless transmission to the MS.

As a result, when the femto BS receives the transmission stop command, the wireless transmission to the MS is stopped, so that it is possible to avoid wasting the transmission power of the femto BS or giving interference to the adjacent cell.

In addition, when the femto GW receives a message related to the movement or location registration of the MS, if it is determined that there is an MS wirelessly accommodated in the BS in a specific calling area, the femto BS wirelessly transmits to the MS. Send to resume Send a resume command.

As a result, when the femto BS receives the transmission resume command, the wireless transmission to the MS is resumed, so that the stopped wireless transmission can be resumed.

FIG. 1 is a block diagram showing a schematic configuration inside the wireless communication system of this embodiment.

The wireless communication system 1 shown in FIG. 1 includes an ASN4 that accommodates and connects a plurality of BS3s that wirelessly accommodate a plurality of MS2s, an Internet 5, and a CSN6 that connects the ASN4 and the Internet 5, for example, in a general home or office. It has a femto BS7 that is arranged and wirelessly accommodates a plurality of MS2s, and an ISP8 that connects to the femto BS7 and connects to the Internet 5 via an optical fiber line or an ADSL line.

The MS2 corresponds to, for example, a personal computer having a wireless function, a mobile terminal, a mobile phone terminal, or the like.

Each BS3 has a call area that can be wirelessly accommodated for each BS3, and each BS3 wirelessly accommodates the MS2 existing in the call area. Further, each femto BS7 also has a call area that can be wirelessly accommodated for each femto BS7, and each femto BS7 wirelessly accommodates a connectable MS2 existing in the call area.

The BS3 and femto BS7 in the wireless communication system 1 are managed in units of call groups such as # 1 and # 2, and the wireless communication system 1 is a call group ID that identifies the call group (hereinafter, simply referred to as PGID). ) And the BSID that identifies BS3 and femto BS7 belonging to the calling group are managed.

In ASN4, there are multiple BS3s, ASN-GW11 that controls the communication interface between BS3 and CSN6, Femto GW12 that controls the communication interface between Femto BS7 and ASN4 via ISP8, and Authentication / Authorization / Account (Authentication). , Authorization and Accounting: It has a server 13 (hereinafter simply referred to as AAA).

FIG. 2 is a block diagram showing a schematic configuration inside the femto BS7.

The femto BS7 shown in FIG. 2 has an antenna unit 21 for transmitting and receiving a wireless signal, a duplexer 22 that enables the antenna unit 21 to be shared by the transmission / reception system, and a duplexer 22 that receives and demolishes the wireless signal from the other party to decode the error correction code. a radio signal receiving unit 23 for reduction, modulates applying encoding processing of the error correction coding to data to be transmitted to the destination, no via the antenna section 21 and the radio signal transmitter 24 for transmitting a line signal, a radio signal It has a radio transmission / reception control unit 25 that controls a reception unit 23 and a radio signal transmission unit 24.

Further, the femto BS7 includes a communication interface 26 that controls an interface with the ISP 8, a femto BS side encryption / decryption processing unit 27 that encrypts or decrypts an IP packet, and a femto BS side storage unit 28 that stores various information. , It has a femto BS side control unit 29 that controls the entire femto BS7. The communication interface 26 can also be directly connected to the femto GW12 without going through the ISP8.

The femto BS side storage unit 28 has a state management unit 31 that manages its own state (active state / idle state) and an access list 33 that manages MS2 that can connect to itself. The idle state of the femto BS7 is a stopped state in which wireless transmission of control information and the like to the MS2 being wirelessly accommodated is stopped, and the active state is a wireless transmission of control information and the like to the MS2 being wirelessly accommodated. It corresponds to the operating state in which the stop is released.

Further, the femto BS side control unit 29 relays and terminates through the wireless link protocol and the network side protocol, and enables MS2 authentication and data communication.

FIG. 3 is a block diagram showing a schematic configuration inside the femto GW12.

The femto GW12 shown in FIG. 3 has a first communication interface 41 that controls an interface with a femto BS7 via, for example, ISP8 or the Internet 5, and a second communication that controls an interface with an internal device in ASN4 such as ASN-GW11 or BS3. It has an interface 42.

In addition, the femto GW12 has a femto GW side encryption / decryption processing unit 43 that encrypts or decrypts an IP packet that exchanges packets with the femto BS7 via the first communication interface 41, and a femto GW side storage unit that stores various information. It has 44 and a femto GW side control unit 45 that controls the entire femto GW 12.

The femto GW side control unit 45 communicates with the AAA server 13 that executes authentication of BS3, femto BS7, and MS2, and also sets an authenticator section 51 that sets a data transfer path to and from the femto BS7, and each MS2. It has a call controller (hereinafter, simply referred to as a PC) unit 52 that calls and controls the call.

The authentication unit 51 makes a communication connection with the AAA server 13 as necessary at the time of initial setting of the femto BS7, and executes the authentication of the femto BS7. The femto BS7 obtains a digital certificate for the AAA server 13 in advance, and the authentication unit 51 authenticates the femto BS7 using the digital certificate through the AAA server 13 and obtains this authentication result. Is.

Further, when the MS2 is newly connected to the femto BS7, the authentication unit 51 makes a communication connection with the AAA server 13 and passes through the AAA server 13 based on the MS2 identification information and the BSID included in the EAP message from the femto BS7. It acquires the connection authentication result that confirms whether the connection between MS2 and Femto BS7 is permitted.

In addition, since the AAA server 13 manages the list of MS2s that are allowed to connect to the femto BS7 based on the information at the time of the new installation contract of the femto BS7, the management contents and the EAP message from the femto BS7 are included. Based on the identification information of MS2 and BSID, it is confirmed whether or not the connection between MS2 and femto BS7 is permitted.

The femto BS7 can also acquire a list of MS2s that are allowed to connect to the femto BS7 as setting information from the AAA server 13 when the femto BS7 is newly connected.

Further, the femto GW side storage unit 44 manages the location information of the neighboring BS list management table 61 that manages adjacent BS3s for each femto BS7, for example, BS3s belonging to the same PGID as neighboring BSs, and the MS2 managed by the femto GW12. It has a location registration database 62 and a femto BS management table 63 that manages the status information (active state / idle state) of the femto BS7 that it manages.

Further, the femto GW side control unit 45 executes the femto BS transmission control determination process described later based on the contents of the neighborhood BS list management table 61, the location registration database 62, and the femto BS management table 63.

When the femto GW side control unit 45 receives a move or location registration message from the MS2, for example, a location registration confirmation, the location registration update MS2 is under the destination BS based on the neighborhood BS list management table 61 and the location registration database 62. It has a pre-movement determination unit 53 that determines whether or not the first condition that the femto BS7 or BS3 in the vicinity of the femto BS7 was present before moving to is satisfied.

In the femto GW side control unit 45, when the first condition is satisfied by the pre-movement determination unit 53, all MS2s connectable to the femto BS7 are separated from the femto BS7 and the BS3 belonging to the same PGID as the femto BS7. It has a first connection presence / absence determination unit 54 that determines whether or not two conditions are satisfied.

The femto GW side control unit 45 determines whether or not the state of the femto BS7 satisfies the third condition, which is the active state, when the second condition is satisfied by the first connection presence / absence determination unit 54. have.

When the active state determination unit 55 satisfies the third condition, the femto GW side control unit 45 determines that the first condition, the second condition, and the third condition are satisfied, and wirelessly transmits the femto BS7 to MS2. It has a command control unit 56 that transmits a transmission stop command (Dormant Command) to the femto BS7 in order to stop the transmission.

In addition, if the femto GW side control unit 45 does not satisfy the first condition in the pre-movement determination unit 53, the femto BS7 or the BS3 near the femto BS7 is subordinated before the location registration update MS2 moves to the subordinate of the destination BS3. Whether or not MS2 that can be connected to femto BS7 meets the fifth condition that exists in femto BS7 or BS3 that belongs to the same PGID as femto BS7. It has a second connection presence / absence determination unit 57 for determination.

The femto GW side control unit 45 determines whether or not the femto BS7 state satisfies the sixth condition, which is the idle state, when the fifth condition is satisfied by the second connection presence / absence determination unit 57. Has 58.

When the idle state determination unit 58 satisfies the sixth condition, the command control unit 56 determines that the fourth condition, the fifth condition, and the sixth condition are satisfied, and wirelessly transmits the femto BS7 to MS2 while the operation is stopped. A Wake-up Command is sent to the femto BS7 in order to resume.

FIG. 4 is an explanatory diagram showing the table contents of the neighboring BS list management table 61 inside the femto GW12.

The femto GW12 manages BS3 adjacent to each femto BS7, for example, BS3 belonging to the same PGID as neighboring BSs in the neighboring BS list management table 61. The setting information of the neighboring BS list management table 61 is to generate a list of BS3 adjacent to the installation location applied at the time of the new installation contract for femto BS7 from the cell design information.

In addition, the setting information of the neighborhood BS list management table 61 can be dynamically set according to the movement of the MS2. That is, when the MS2 hands over from the femto BS7 to the destination BS3, or when the MS2 moves from the femto BS7 to the destination BS3 and registers the location, the destination BS3 is regarded as a neighborhood BS of the femto BS7 and the neighborhood BS list is managed. It may be added to Table 61.

Further, the femto BS7 itself may receive the radio signal of the peripheral BS3, and based on the radio signal, the peripheral BS3 of the femto BS7 may be added to the neighborhood BS list management table 61 as a neighborhood BS.

FIG. 5 is an explanatory diagram that briefly shows the data structure of the information managed by the location registration database 62 inside the femto GW12.

The location registration database 62 manages the location information of MS2 managed by the femto GW12.

The location information includes MAC address 62A that identifies MS2, PGID62B that identifies the calling group to which MS2 belongs, BSID62C that identifies BS3 or femto BS7 that wirelessly accommodates MS2, and whether or not there is an incoming call to MS2 in idle mode. It has a call cycle 62D for transmitting the call notification message and a call offset 62E for offset management of the timing of the call cycle 62D.

Next, the operation of the wireless communication system 1 of the first embodiment will be described. FIG. 6 is a sequence showing the processing operation inside the wireless communication system 1 related to the initial setting of the femto BS.

The initial setting of the femto BS corresponds to the setting operation from the new installation of the femto BS7 in the wireless communication system 1 to the start of communication with the MS2 that can be connected to the femto BS7 via the femto BS7.

For example, suppose that a new femto BS7 is installed in the house and connected to ISP8 via an ADSL line or an optical fiber line.

When the femto BS7 shown in FIG. 6 establishes a connection with the ISP8, it sets an IPsec tunnel to ensure communication confidentiality with the femto GW12 (step S11).

The femto GW12 communicates with the AAA server 13 as needed to authenticate the femto BS7 (step S12). Since the femto BS7 has acquired the digital certificate for the AAA server 13 in advance, the AAA server 13 authenticates the femto BS7 using the digital certificate.

When the authentication of the femto BS7 is successful, the AAA server 13 sends the configuration information of the femto BS7 to the femto BS7 (step S13). If the authentication is successful, the femto BS7 can also acquire the setting information of the femto BS7 from a server other than the AAA server 13.

When the femto BS7 receives the setting information, it starts the basic operation as a base station (step S14).

The basic operation as a base station is preamble, downlink (hereinafter, simply referred to as DL) / uplink (hereinafter, simply referred to as UL) MAP information (hereinafter, simply referred to as UL). Control information such as DL / UL-MAP), Down Channel Discripter (hereinafter, simply referred to as DCD) / Up Channel Discripter (hereinafter, simply referred to as UCD), etc. are being wirelessly accommodated. It transmits wirelessly to MS2.

Next, when the MS2 starts a new connection to the newly installed femto BS7, the femto BS7 executes the authentication operation of the MS2 in order to determine whether or not to allow the connection of the MS2.

That is, the MS2 and the femto BS7 adjust the transmission parameters (frequency, timing and transmission power) through the ranging process (step S15) and negotiate the SBC (SS Basic Capability) (step S16).

In addition, MS2 uses the Privacy Key Management (hereinafter, simply referred to as PKM) protocol, and the Extensible Authentication Protocol (hereinafter, simply referred to as EAP) message for authenticating MS2 is femto BS7. Send to (step S17). The PKM is used to transfer the EAP message between the femto BS7 and MS2. In addition, the EAP message includes MS2 identification information for authenticating MS2.

When the femto BS7 receives an EAP message for MS2 authentication, it uses the EAP-Transfer protocol to transfer an EAP message containing its BSID to the femto GW12 in addition to the MS2 identification information. (Step S18).

The authentication unit 51 inside the femto GW12 forwards the EAP message received from the femto BS7 to the AAA server 13 using the RADIUS protocol or the like.

Whether or not the AAA server 13 permits the connection between the MS2 and the femto BS7 based on the management contents related to the connection permission of the femto BS7 and the MS2, the MS2 identification information included in the EAP message, and the BSID of the femto BS7. Execute connection authentication and send the connection authentication result to femto GW12 (step S19).

If the femto GW12 allows the connection between the MS2 and the femto BS7 through the AAA server 13, it uses the EAP forwarding protocol to forward the EAP message of successful authentication to the femto BS7 (step S20).

When the femto BS7 receives the EAP message (EAP transfer) of successful authentication in step S20, it adds a MAC (Media Access Controll) address that identifies the MS2 of successful authentication to the access list (Access List) 33 (step S21). ..

When the femto BS7 adds the successfully authenticated MS2 to the access list 33, the femto BS7 sends an EAP message of the successfully authenticated MS2 to the MS2 (step S22).

When the femto BS7 sends an EAP message of successful authentication of MS2 to MS2, it executes a registration (REG) operation (step S23) and starts communication with MS2 (step S24).

In addition, when the femto GW12 receives the EAP message of the authentication failure of MS2 through the AAA server 13, it sends the authentication failure to MS2 via femto BS7 and reconnects to other femto BS7 or other BS3 to MS2. Will be urged.

In addition, if the MAC address of the MS2 is not in the access list 33, the femto BS7 sends an authentication failure to the MS2 and prompts the MS2 to reconnect to another femto BS7 or another BS3.

In the sequence of FIG. 6, the case where the MS2 newly connects to the newly installed femto BS7 has been described as an example, but for example, when the MS2 connects to the destination femto BS7 according to the handover, or in the idle mode. Even if MS2 returns to active mode and connects to femto BS7, if the MAC address of MS2 is not in access list 33 in femto BS7, connection authentication between MS2 and femto BS7 in steps S17 to S20 is executed. If the authentication is successful, the MAC address of MS2 will be added to the access list 33 in Femto BS7.

Next, the operation when the MS2 moves from the femto BS7 to another BS3 after the MS2 shifts from the active mode to the idle mode and leaves the femto BS7 will be described. FIG. 7 is a sequence showing the processing operation inside the wireless communication system 1 accompanying the movement between call groups from the femto BS7 to another BS3 by the MS2 in the idle mode.

The MS2 shown in FIG. 7 sends a withdrawal request (DREG-REQ) message to the femto BS7 when transitioning from the active mode to the idle mode (step S31).

Upon receiving the withdrawal request message, the femto BS7 sends an idle transition request (IM Entry State Change-Request) to the femto GW12 as a preparatory step for the MS2 to transition to idle mode (step S32). The idle transition request includes MS2 information (various registration information, security information, service flow information, etc.), MS2 PGID, and a BSID for identifying the source BS, that is, the femto BS7.

Since the femto GW12 manages the PGID as necessary information regarding the MS2, the PCID that identifies the PC unit 52 of the femto GW12, the call cycle, etc., when an idle transition request is received, the idle including the PGID, the PCID, the call cycle, etc. Send an IM Entry State Change-Response to the femto BS7 (step S33).

Upon receiving the idle transition request response, the femto BS7 sends a withdrawal command (DERG-CMD) message including the call cycle to MS2 (step S34). Upon receiving the exit command message, the MS2 will transition to idle mode (step S35).

Furthermore, if the MS2 in idle mode is under its control, the femto BS7 sends a Paging Advertisement (PAG-ADV) message to the MS2 based on the call cycle included in the idle transition request response. (Step S36).

Also, if MS2 in idle mode moves to BS3 far away from the femto BS7, for example BS3 in # 2 (step S37), MS2 is in the calling area of BS3 in # 2, so # 2 You will receive the call notification message obtained from BS3.

However, in MS2, the PGID included in the call notification message received by BS3 of # 2 and the PGID included in the call notification message received by femto BS7 are different, so that he / she is in the call area of BS3 of femto BS7 to # 2. Recognizing that it has moved to, it will start its own location registration update operation.

When the MS2 activates the location registration update operation, it sends a range request (RNG-REQ) message including the PCI ID and the location registration update flag (hereinafter, simply referred to as the LU flag) to BS3 of # 2 (step S38). The LU flag indicates that the range request message is a message requesting its own location registration.

When BS3 of # 2 receives the range request message from MS2, it registers the location including the PGID and the BSID that identifies BS3 of its own # 2 based on the PCID from MS2, that is, the PCID of the PC part 52 of the femto GW12. A request (LU Req) is sent to the PC section 52 inside the femto GW12 via ASN-GW11 (step S39) (step S40).

When the PC unit 52 inside the femto GW12 receives the location registration request via ASN-GW11, it sends a location registration request response (LU Rsp) to BS3 of # 2 via ASN-GW11 (step S41) (step S42). ..

In the location registration request response, a message authentication code (Cipher-based message authentication code: hereinafter simply referred to as CMAC) for checking the validity of the range request message received from MS2 in step S38 on the BS3 side of # 2). Contains key information for calculating.

When BS3 of # 2 receives the location registration request response, it calculates the CMAC of the range registration request message based on the CMAC key information included in the location registration request response, and calculates the calculation result CMAC and the CMAC attached to the range registration request message. Check the validity of the range request message by comparing with.

When BS3 of # 2 confirms the validity of the range request message from MS2 based on the CMAC comparison result, it sends a range request response (RNG-RSP) message including the validity confirmation to MS2 (step S43).

Further, BS3 of # 2 transmits the location registration confirmation (LU Confirm) for the location registration request response in step S42 to the PC unit 52 inside the femto GW12 via ASN-GW11 (step S44) (step S45).

When the PC unit 52 inside the femto GW12 receives the location registration confirmation from BS3 of # 2 via ASN-GW11, it is based on the BSID and PGID of BS3 of # 2 included in the location registration request received in step S40. , The location information of MS2 is updated and registered in the location registration database 62 (step S46).

Then, when the femto GW12 updates the location registration database 62, the femto BS transmission control determination process is executed (step S47).

In the femto BS transmission control determination process, based on the contents of the location registration database 62, the femto BS7 or the BS3 in the vicinity of the femto BS7 is performed before the location registration update MS2 is moved under the BS3 of # 2 by the pre-movement determination unit 53. All MS2s that satisfy the first condition that they existed under the control and can be connected to the femto BS7 by the first connection presence / absence determination unit 54 are separated from the femto BS7 and the BS3 belonging to the same PGID as the femto BS7. The second condition is satisfied, and further, the active state determination unit 55 determines whether or not the third condition that the femto BS7 is in the active state is satisfied.

When the first condition, the second condition, and the third condition are satisfied through the femto BS transmission control determination process, the command control unit 56 inside the femto GW12 is in an idle state with respect to the femto BS7, that is, the wireless transmission of control information is stopped. A send stop command is sent to the femto BS7 to indicate (step S48).

When the femto BS7 receives the transmission stop command from the femto GW12, the femto BS7 shifts to an idle state in which the wireless transmission of control information is stopped (step S49). As a result, the femto BS7 can avoid wasting transmission power or giving interference to adjacent cells.

Further, when the femto BS7 shifts to the idle state in which the wireless transmission is stopped, an acknowledgment (Ack) indicating the transition to the idle state is transmitted to the femto GW12 (step S50).

When the femto GW12 receives the confirmation response of the idle state from the femto BS7, the femto BS7 status information is updated in the femto BS management table 63 as the idle state.

Next, the operation when the MS2 in the idle mode moves from the femto BS7 to another BS3 to a BS3 near the femto BS7, for example, BS3 of # 1, will be described. FIG. 8 is a sequence showing the processing operation inside the wireless communication system 1 accompanying the movement between call groups from another BS3 to BS3 near the femto BS7 by MS2 in the idle mode.

For example, when MS2 in idle mode moves from BS3 of # 2 to BS3 of # 1, the PGID included in the call notification message received from BS3 of # 1 and the PGID included in the call notification message received from BS3 of # 2. Because it is different from, it recognizes that it has moved from the femto BS7 to the calling area of BS3 of # 1, and activates its own location registration update operation.

When the MS2 in idle mode activates the location registration update operation, it sends a range request message including the PCI ID and LU flag to BS3 of # 1 (step S61).

When BS3 of # 1 receives the range request message from MS2, it sends a location registration request including PGID and BSID that identifies BS3 of its own # 1 via ASN-GW11 based on the PCID included in the range request message (step). In S62), it is transmitted to the PC unit 52 inside the femto GW12 (step S63).

When the PC unit 52 inside the femto GW12 receives the location registration request via ASN-GW11, it sends a location registration request response including the CMAC key information that authenticates the validity of the range request message via ASN-GW11 (step S64). Send to BS3 of # 1 (step S65).

When BS3 of # 1 receives the location registration request response, it calculates the CMAC of the range registration request message based on the CMAC key information included in the location registration request response, and calculates the CMAC of the calculation result and the CMAC attached to the range registration request message. Check the validity of the range request message by comparing with.

When BS3 of # 1 confirms the validity of the range request message from MS2 based on the CMAC comparison result, it sends a range request response message including the validity confirmation to MS2 (step S66) and responds to the location registration request. The location registration confirmation is transmitted to the PC unit 52 inside the femto GW12 via ASN-GW11 (step S67) (step S68).

When the PC unit 52 inside the femto GW12 receives the location registration confirmation from BS3 of # 1 via ASN-GW11, it is based on the BSID and PGID of BS3 of # 1 included in the location registration request received in step S63. , The location information of MS2 is updated and registered in the location registration database 62 (step S69).

Then, when the femto GW12 updates the location registration database 62, the femto BS transmission control determination process is executed (step S70).

In the femto BS transmission control determination process, based on the contents of the location registration database 62, the femto BS7 or the BS3 in the vicinity of the femto BS7 is performed before the location registration update MS2 moves under the BS3 of # 1 in the pre-movement determination unit 53. No. 1 that does not satisfy the first condition that existed under the control, that is, the fourth condition is satisfied, and the current MS2 is under the control of femto BS7 or BS3 that belongs to the same PGID as femto BS7 in the second connection presence / absence determination unit 57. The five conditions are satisfied, and further, the idle state determination unit 58 determines whether or not the femto BS7 satisfies the sixth condition in the idle state.

When the fourth condition, the fifth condition, and the sixth condition are satisfied through the femto BS transmission control determination process, the command control unit 56 inside the femto GW12 activates the femto BS7, that is, restarts the wireless transmission of control information. A send resume command is sent to the femto BS7 for instruction (step S71).

When the femto BS7 receives the transmission resume command from the femto GW12, the femto BS7 shifts to the active state of resuming the wireless transmission of the control information (step S72). As a result, the femto BS7 will resume basic operation as a base station for MS2.

Further, when the femto BS7 shifts to the active state for resuming wireless transmission, the femto BS7 transmits an acknowledgment indicating the active state to the femto GW12 (step S73).

When the femto GW12 receives the confirmation response of the active state from the femto BS7, the femto BS7 status information is updated in the femto BS management table 63 as the active state.

Next, the operation of BS3 (femto BS7) that has received the range request message (see step S38 in FIG. 7 and step S61 in FIG. 8) from MS2 will be described. FIG. 9 is a flowchart showing the processing operation inside BS3 (femto BS7) related to the range request reception processing.

In FIG. 9, when BS3 (femto BS7) receives the range request message from MS2 (step S81), it determines whether or not the MAC address of MS2 of the range request message is in the access list 33 (step S82).

BS3 (femto BS7) determines whether the range request message has CMAC when the MAC address of MS2 is in the access list 33 (step S82 affirmative) (step S83).

The range request message with CMAC is a range request message from MS2 that has moved from the adjacent BS3 by handover or MS2 that has returned from idle mode to active mode. In addition, the range request message without CMAC is a message sent from MS2 in the start process of the initial stage after the power is turned on.

BS3 (Femto BS7) obtains the key information for confirming the validity of CMAC from Femto GW12 when the range request message has CMAC (step S83 affirmative), and calculates CMAC based on this obtained key information. , Compare the calculated CMAC with the CMAC attached to the ranging request message (step S84).

BS3 (femto BS7) determines whether or not the CMAC matches based on the comparison result (step S85).

If the CMAC matches (step S85 affirmative), BS3 (femto BS7) determines that the range request message is valid and allows connection with the MS2 that sent the range request message (step S86), as shown in FIG. The processing operation shown in is terminated.

In addition, BS3 (femto BS7) does not have the MAC address of MS2 in the access list 33 (step S82 denied), or the range request message does not have CMAC (step S83 denied), or the CMAC does not match. (Negation of step S85), Judging that the range request message received in step S81 is not valid, execute full authentication with femto GW12 and AAA server 13 to start MS2 authentication of the range request message. This ends the processing operation shown in FIG. 9 (step S87).

Full authentication means EAP authentication in which MS2 uses the PKM protocol to send an EAP message including a digital certificate to AAA server 13 via Femto BS7 and Femto GW12, and authenticates MS2 on the AAA server 13 side. It is equivalent.

Further, the EAP message is transferred between the femto BS7 and the femto GW12 using the EAP transfer protocol, and the EAP message is transferred between the femto BS7 and the AAA server 13 using an authentication protocol such as RADIUS.

In addition, when executing full authentication of MS2, BS3 (femto BS7) obtains the authentication result of MS2 on the AAA server 13 side from femto GW12 using the EAP transfer protocol.

In the range request reception process shown in FIG. 9, when the range request message from MS2 is received, the MAC address of MS2 related to the range request message is in the access list 33, the range request message has CMAC, and the range request message is attached. When the CMAC of the range request message matches, BS3 (femto BS7) allows connection with the MS2 that sent the range request message, so it is possible to prevent unauthorized connection of MS2 to BS3 (femto BS7). it can.

In the range request reception process, if the MAC address of MS2 related to the range request message is not in the access list 33, or if the range request message does not have CMAC, or if the CMAC of the range request message does not match, BS3 Since (Femto BS7) executes full authentication of MS2 that sent the range request message, it is possible to prevent unauthorized connection of MS2 to BS3 (Femto BS7).

Next, the operation of the femto BS7 when the full authentication of MS2 is executed and the EAP message of the successful authentication of MS2 on the AAA server 13 side is received from the femto GW12 using the EAP forwarding protocol will be described. FIG. 10 is a flowchart showing the processing operation inside the femto BS7 related to the access list addition processing.

In FIG. 10, when the femto BS7 receives an EAP message from the AAA server 13 via the femto GW12 using the EAP forwarding protocol (step S91), the femto BS7 determines whether the MS2 authentication is successful based on the EAP message (step S91). Step S92).

If the MS2 authentication is successful (step S92 affirmative), the femto BS7 adds the MS2 MAC address to the access list 33 (step S93), and ends the processing operation shown in FIG.

Further, the femto BS7 ends the processing operation shown in FIG. 10 when the authentication of MS2 is not successful (step S92 is denied).

When the femto BS7 adds the MAC address of the MS2 to the access list 33, the femto BS7 forwards the authentication success or authentication failure EAP message received by the EAP forwarding protocol to the MS2.

The MAC address of MS2 added to the access list 33 may be automatically deleted after a certain period of time, or may be deleted according to a command.

In the access addition process shown in Fig. 10, when an EAP message by the EAP transfer protocol is received via the femto GW12 and the MS2 authentication is successful, the MAC address of this MS2 is added to the access list 33 in the femto BS7. Therefore, the femto BS7 can recognize the connectable MS2 based on the contents of the access list 33.

Next, the operation of the femto BS7 that has received the MS2 withdrawal request message will be described. FIG. 11 is a flowchart showing the processing operation inside the femto BS7 related to the withdrawal request reception processing.

When the femto BS7 receives the withdrawal request message from the MS2 in FIG. 11 (step S101), the femto BS7 transmits the idle transition request of the MS2 to the PC unit 52 in the femto GW12 (step S102).

When the femto GW12 receives the idle transition request, it registers the BSID and MS2 information included in the idle transition request. Further, the femto GW12 stores the PCID that identifies its own PC unit 52 and the idle mode parameters (call cycle, etc.), and stores these PCIDs and idle mode parameters (call cycle, etc.) in the idle transition request response. , Send this idle transition request response to femto BS7.

When the femto GW12 sends an idle transition request response to the femto BS7, the femto GW12 sets the system timer and monitors the presence or absence of the location registration update of the MS2 before the system timer times out.

The femto GW12 can delete the related information of MS2 if there is no location registration update of MS2 by the time the system timer expires. The PC unit 52 inside the femto GW12 updates and registers idle mode parameters (call cycle, etc.) in the location registration database 62 as the location information of the MS2.

When the femto BS7 receives the idle transition request response from the femto GW12 (step S103), it stores the idle mode parameters (call cycle, etc.) included in the idle transition request response (step S104), and includes this parameter. A withdrawal command message is sent to MS2 (step S105), and the processing operation shown in FIG. 11 ends.

As a result, the MS2 shifts to the idle mode in response to the withdrawal command message, and stores the idle mode parameters (call cycle, etc.) included in the withdrawal command message.

After that, the MS2 periodically receives a call notification message indicating the presence or absence of an incoming call from the femto BS7 based on the idle mode parameters (call cycle, etc.) stored.

In the withdrawal request reception process on the femto BS7 side shown in FIG. 11, since the withdrawal command message is sent to the MS2 in response to the withdrawal request command from the MS2, the MS2 can shift to the idle mode.

In addition, in the withdrawal request reception process, a withdrawal command message including idle mode parameters (call cycle, etc.) is sent to MS2. Therefore, in MS2, femto BS7 is based on the call cycle even in idle mode. It is possible to periodically receive a call notification message indicating whether or not there is an incoming call from, and recognize whether or not there is an incoming call.

FIG. 12 is a flowchart showing the processing operation inside the femto BS7 related to the call notification transmission processing.

The femto BS7 determines whether or not the call cycle of the idle mode parameter has been reached (step S111).

When the call cycle is reached (step S111 affirmative), the femto BS7 sends a call notification message to MS2 (step S112), and proceeds to step S111.

If the femto BS7 does not reach the call cycle (negation of step S111), the femto BS7 continues the determination operation of step S111 until the call cycle is reached.

In the call notification transmission process on the femto BS7 side shown in FIG. 12, even if the MS2 is in idle mode, the call notification message is transmitted to the MS2 according to the call cycle, so that the MS2 recognizes the presence or absence of an incoming call. be able to.

Next, the operation of the femto BS7 (BS3) when a range request message including the LU flag (location registration range request message) is received from MS2 will be described. FIG. 13 is a flowchart showing the processing operation inside the femto BS7 (BS3) related to the location registration range request reception processing.

The MS2 will start the location registration update operation in order to register its current position on a regular basis or when it moves under BS3 belonging to a new calling group. For example, in the periodic location registration update, a range registration request message for location registration is sent to BS3 or femto BS7 with the start timing when the internal timer held by MS2 is timed up. Further, in the location registration update due to movement, the range registration request message for location registration is transmitted to BS3 or femto BS7 with the activation timing when the PGID of the received call notification message changes.

It is assumed that the MS2 sends a range request message (location registration range request message) including the PCI ID and LU flag to the destination femto BS7 (BS3). The PCID corresponds to the latest PCID among the PCIDs notified at the time of transition to idle mode or the latest update of location registration.

In FIG. 13, when the femto BS7 (BS3) receives the range request message including the LU flag (step S121), the femto BS7 (BS3) receives the PCID from MS2 and its own BSID via ASN-GW11 based on the PCID included in the range request message. A location registration request including the above is transmitted to the PC unit 52 inside the femto GW12 (step S122).

When the femto GW12 receives the location registration request, the femto GW12 updates the location information of the MS2 to the location registration database 62 based on the PGID related to the MS2 included in the location registration request and the latest BSID. Further, the femto GW12 sends a location registration request response to the femto BS7 (BS3) and resets the system timer. The timer time of the system timer is set to be slightly longer than the timer time of the internal timer held by MS2.

When the femto BS7 (BS3) receives the location registration request response from the femto GW12 (step S123), it calculates the CMAC of the range registration request message based on the CMAC key information included in the location registration request response, and obtains the calculation result. Compare the CMAC with the CMAC attached to the range request message, and confirm the validity of the range request message received in step S121 (step S124).

When the femto BS7 (BS3) confirms the validity of the range request message from MS2, it sends a range request response message including the validity confirmation to MS2, and confirms the location registration for the location registration request via ASN-GW11. Is transmitted to the femto GW12 (step S125), and the processing operation shown in FIG. 13 is terminated.

Further, when the femto BS7 (BS3) cannot confirm the validity of the range request message from MS2, the femto BS7 (BS3) sends a range request response message including the invalidity confirmation to MS2 in step S125, and the process shown in FIG. End the operation.

In the location registration range registration request reception process on the femto BS7 (BS3) side shown in FIG. 13, a range request message including the LU flag was received from MS2, and the validity of the range request message was confirmed based on the CMAC of the range request message. In this case, since the range registration request response message is sent to the MS2 and the location registration confirmation is sent to the femto GW12, the location registration can be notified to the MS2 and the femto GW12.

Next, the transmission stop processing of the femto GW12 will be described. FIG. 14 is a flowchart showing the processing operation inside the femto GW12 related to the transmission stop processing.

When the femto GW12 receives a location registration request from the destination BS3 (femto BS7) (step S131), the femto GW12 registers the location including the key information for checking the CMAC of the range request message on the destination BS3 (femto BS7) side. The request response is sent to the destination BS3 (femto BS7) (step S132).

After sending the location registration request response, the femto GW12 receives a location registration confirmation indicating whether the BS3 (femto BS7) side has confirmed the validity of the range request message from MS2 (step S133), and the femto GW12 confirms the location registration. Based on this, if the validity of the range request message can be confirmed, the location information of MS2 is updated to the location registration database 62 based on the BSID and PGID included in the previously received location registration request (step S134).

Based on the contents of the location registration database 62, the pre-movement determination unit 53 of the femto GW12 is the first that exists under the femto BS7 or the BS3 near the femto BS7 before the MS2 of the location registration update moves under the destination BS3. It is determined whether or not the condition is satisfied (step S135).

In the first connection presence / absence determination unit 54 of the femto GW12, when the first condition is satisfied by the pre-movement determination unit 53 (step S135 affirmative), all MS2s connectable to the femto BS7 have the same PGID as the femto BS7 and the femto BS7. It is determined whether or not the second condition of being away from BS3 belonging to is satisfied (step S136).

The active state determination unit 55 of the femto GW12 determines whether or not the femto BS7 satisfies the third condition of the active state when the first connection presence / absence determination unit 54 satisfies the second condition (step S136 affirmative). Determine (step S137).

When the active state determination unit 55 satisfies the third condition (step S137 affirmative), the command control unit 56 of the femto GW12 indicates the femto BS7 to be in an idle state, that is, to stop wireless transmission of control information. , Send a stop transmission command to femto BS7 (step S138).

When the femto BS7 receives the transmission stop command from the femto GW12, the femto BS7 shifts to an idle state in which the wireless transmission of control information is stopped. As a result, the femto BS7 can avoid wasting transmission power and causing interference with adjacent cells.

When the femto GW12 sends a transmission stop command to the femto BS7, the femto GW12 waits for an acknowledgment that the femto BS7 has transitioned to the idle state (step S139).

When the femto GW12 receives the confirmation response of the idle state (step S140), the femto BS7 updates the state information of the femto BS7 to the femto BS management table 63 as an idle state (step S141), and ends the processing operation shown in FIG.

In addition, the femto GW12 does not satisfy the first condition in the pre-movement determination unit 53 (step S135 negative), or does not satisfy the second condition in the first connection presence / absence determination unit 54 (step S136 negative). Or, when the active state determination unit 55 does not satisfy the third condition (step S137 negated), the processing operation shown in FIG. 14 is terminated.

In the transmission stop processing on the femto GW12 side shown in FIG. 14, when the location registration confirmation of MS2 is received, the contents of the location registration database 62 are updated, and the first condition, the second condition, and the second condition are updated based on the contents of the location registration database 62. When the three conditions are satisfied, the transmission stop command is transmitted to the femto BS7, so that the femto BS7 side can avoid wasting transmission power and giving interference to adjacent cells.

Next, the operation of the femto BS7 that has received the transmission stop command from the femto GW12 will be described. FIG. 15 is a flowchart showing the processing operation inside the femto BS7 related to the transmission stop command reception processing.

In FIG. 15, when the femto BS7 receives the transmission stop command from the femto GW12 (step S151), the femto BS7 determines whether or not the subordinate MS2 exists (step S152).

If the subordinate MS2 does not exist (step S152 negative), the femto BS7 shifts to the idle state to stop wireless transmission (step S153), and sends an acknowledgment indicating the transition to the idle state to the femto GW12 (step S152). S154).

When the femto BS7 transmits an idle status acknowledgment to the femto GW12, the femto BS7 ends the processing operation shown in FIG. 15 while remaining in the reception standby state of the transmission restart command.

In the transmission stop command reception process on the femto BS7 side shown in FIG. 15, when the transmission stop command from the femto GW12 is received, the state shifts to the idle state in which the wireless transmission of control information is stopped, so that the femto BS7 side is useless. It is possible to avoid wasting transmission power and causing interference with adjacent cells.

Next, the transmission control process including the transmission stop process and the transmission restart process of the femto GW12 will be described. FIG. 16 is a flowchart showing the processing operation inside the femto GW12 related to the transmission control processing.

In FIG. 16, after sending the location registration request response, the femto GW12 receives a location registration confirmation indicating that the validity of the MS2 range request message has been confirmed from the destination BS3 (femto BS7) side (step S161). If the validity of the ranging request message can be confirmed based on the location registration confirmation, the location information of MS2 is updated to the location registration database 62 based on the BSID and PGID included in the previously received location registration request (step S162). ).

Based on the contents of the location registration database 62, the pre-movement determination unit 53 in the femto GW12 exists under the femto BS7 or the BS3 near the femto BS7 before the location registration update MS2 moves under the destination BS3. 1 Determine whether the condition is met (step S163).

In the first connection presence / absence determination unit 54 in the femto GW12, when the first condition is satisfied by the pre-movement determination unit 53 (step S163 affirmative), all MS2s that can be connected to the femto BS7 are the same as the femto BS7 and the femto BS7. It is determined whether or not the second condition of being away from BS3 belonging to the PGID is satisfied (step S164).

If the active state determination unit 55 in the femto GW12 satisfies the second condition in the first connection presence / absence determination unit 54 (step S164 affirmative), whether or not the femto BS7 satisfies the third condition in the active state. Is determined (step S165).

When the active state determination unit 55 satisfies the third condition (step S165 affirmative), the command control unit 56 in the femto GW12 indicates the femto BS7 to be in an idle state, that is, to stop wireless transmission of control information. Therefore, a transmission stop command is transmitted to the femto BS7 (step S166).

When the femto BS7 receives the transmission stop command from the femto GW12, the femto BS7 shifts to an idle state in which the wireless transmission of control information is stopped. As a result, the femto BS7 can avoid wasting transmission power and causing interference with adjacent cells.

When the femto GW12 sends a transmission stop command to the femto BS7, the femto GW12 is in a waiting state for receiving an acknowledgment indicating the status of the femto BS7 from the femto BS7 (step S167). When the femto BS7 receives the transmission stop command, it shifts from the active state to the idle state, so that the confirmation response of the idle state is transmitted to the femto GW12.

When the femto GW12 receives an acknowledgment indicating the status of the femto BS7 (step S168), the femto BS7 updates the status information of the femto BS7 to the femto BS management table 63 (step S169), and ends the processing operation shown in FIG.

Further, the pre-movement determination unit 53 in the femto GW12 exists under the femto BS7 or the BS3 near the femto BS7 before the MS2 of the location registration update moves under the move destination BS3 based on the contents of the location registration database 62. If the first condition is not satisfied (step S163 is denied), it is determined that the fourth condition is satisfied.

In addition, when the fourth condition is satisfied, the second connection presence / absence determination unit 57 in the femto GW12 determines whether the current MS2 satisfies the fifth condition under the control of BS3 belonging to the same PGID as the femto BS7 or the femto BS7. Determine (step S170).

When the second connection presence / absence determination unit 57 satisfies the fifth condition (step S170 affirmative), the idle state determination unit 58 in the femto GW12 determines whether the femto BS7 satisfies the sixth condition in the idle state. (Step S171).

When the sixth condition is satisfied by the idle state determination unit 58 (step S171 affirmative), the command control unit 56 in the femto GW12 indicates to the femto BS7 that it is in the active state, that is, restarts wireless transmission of control information. , Send a send resume command to femto BS7 (step S172).

When the femto BS7 receives the transmission restart command from the femto GW12, the femto BS7 shifts to the active state of restarting the wireless transmission of the control information. As a result, the femto BS7 will resume basic operation as a base station for MS2.

When the femto GW12 transmits a transmission restart command to the femto BS7, the femto GW12 proceeds to step S167 so as to be in a waiting state for receiving an acknowledgment indicating status information from the femto BS7. In the femto BS7, when the transmission restart command is received, the idle state is changed to the active state. Therefore, in order to send the confirmation response of the active state to the femto GW12, the process proceeds to step S167.

When the femto GW12 receives the confirmation response of the active state in step S168, the femto BS7 status information is updated to the femto BS management table 63 as the active state in step S168, and the processing operation shown in FIG. 16 ends.

In addition, the femto GW12 does not satisfy the second condition in the first connection presence / absence determination unit 54 (step S164 negative), or does not satisfy the third condition in the active state determination unit 55 (step S165 negative). Or, when the fifth condition is not satisfied by the second connection presence / absence determination unit 57 (step S170 is denied), or when the sixth condition is not satisfied by the idle state determination unit 58 (step S171 is denied), FIG. The processing operation shown is terminated.

In the transmission control process on the femto GW12 side shown in FIG. 16, when the location registration confirmation of MS2 is received, the contents of the location registration database 62 are updated, and the first condition, the second condition, and the second condition are updated based on the contents of the location registration database 62. When the three conditions are satisfied, the transmission stop command is transmitted to the femto BS7, so that the femto BS7 side can avoid wasting transmission power and giving interference to adjacent cells.

In the transmission control process on the femto GW12 side, when the location registration confirmation of MS2 is received, the contents of the location registration database 62 are updated, and the fourth condition, the fifth condition, and the sixth condition are satisfied based on the contents of the location registration database 62. In that case, since the transmission resume command is transmitted to the femto BS7, the wireless transmission of the control information can be resumed on the femto BS7 side.

Next, the operation of the femto BS7 when the transmission resume command is received from the femto GW12 will be described. FIG. 17 is a flowchart showing the processing operation inside the femto BS7 related to the transmission restart command reception processing.

When the femto BS7 shown in FIG. 17 receives the transmission resume command from the femto GW12 (step S181), the femto BS7 shifts to the active state for resuming the wireless transmission of control information (step S182), and the femto GW12 gives an acknowledgment indicating the active state. Send to (step S183).

When the femto BS7 transmits the confirmation response in the active state to the femto GW12, the femto BS7 ends the processing operation shown in FIG. 17 while remaining in the reception standby state of the transmission stop command.

In the transmission restart command reception process on the femto BS7 side shown in FIG. 17, when the transmission restart command from the femto GW12 is received, the state shifts to the active state in which the wireless transmission of the stopped control information is restarted. Then, the wireless transmission of the control information can be resumed.

In the first embodiment, when the location registration confirmation of MS2 is received, the contents of the location registration database 62 are updated, and if the first condition, the second condition, and the third condition are satisfied based on the contents of the location registration database 62, the femto Since the transmission stop command is transmitted to BS7, it is possible to avoid wasting transmission power and causing interference to adjacent cells on the femto BS7 side.

In the first embodiment, when the location registration confirmation of MS2 is received, the contents of the location registration database 62 are updated, and if the fourth condition, the fifth condition, and the sixth condition are satisfied based on the contents of the location registration database 62, the femto Since the transmission resume command is transmitted to the BS7, the femto BS7 side can resume the wireless transmission of the control information.

In the first embodiment, the PC unit 52 for the MS2 is provided inside the femto GW12, and the PC unit 52 in the femto GW12 is in the active / idle state of the femto BS7 by constantly acquiring the latest position information of the MS2. However, it lacks the expandability of the system to always place the PC unit 52 inside the femto GW12.

Therefore, the wireless communication system 1A in the case where the PC unit 52 is provided inside the ASN-GW11 other than the femto GW12 will be described below as the second embodiment.

FIG. 18 is a block diagram showing a schematic configuration inside the femto GW12A of the second embodiment. FIG. 19 is a block diagram showing a schematic configuration inside the ASN-GW11A of the second embodiment. The same configurations as those of the wireless communication system 1 of the first embodiment are designated by the same reference numerals, and the overlapping configurations and operation configurations are omitted.

The femto GW side control unit 45A inside the femto GW 12A shown in FIG. 18 does not include a PC unit 52 having a call controller function, but has an authentication unit 51, a pre-movement determination unit 53, a first connection presence / absence determination unit 54, and an active state. It includes a determination unit 55, a command control unit 56, a second connection presence / absence determination unit 57, and an idle state determination unit 58.

The ASN-GW11A shown in FIG. 19 contains various information such as a third communication interface 71 that controls a communication interface connected to an internal device of ASN4 such as BS3 and femto GW12, and a fourth communication interface 72 that controls a communication interface with CSN6. It has an ASN-GW side storage unit 73 for storing the interface and an ASN-GW side control unit 74 for controlling the entire ASN-GW11A.

Inside the control unit 74 on the ASN-GW side, a PC unit 52A having a call controller function is built in.

In addition, the AAA server 13 is based on the information at the time of the new installation contract of the femto BS7, along with the identification information related to the MS2 that is permitted to connect to the femto BS7, the BSID of the femto BS7 connected to the MS2, and the PC ID of the ASN-GW11A. Manages the list of.

Next, the operation of the wireless communication system 1A of the second embodiment will be described. FIG. 20 is a sequence showing the processing operation inside the wireless communication system 1A when the MS2 starts a new connection to the femto BS7.

The MS2 and femto BS7 shown in FIG. 20 adjust the transmission parameters (frequency, timing and transmission power) and negotiate the SBC through the range process (step S191) (step S192).

The MS2 uses the PKM protocol to send an EAP message to the femto BS7 to authenticate the MS2 (step S193). The EAP message includes MS2 identification information and the like for MS2 authentication.

When the femto BS7 receives the EAP message for MS2 authentication, it uses the EAP forwarding protocol to forward the EAP message containing its own BSID to the femto GW12A in addition to the MS2 identification information (step S194).

The authentication unit 51 inside the femto GW12A transfers the EAP message received from the femto BS7 to the AAA server 13 using the RADIUS protocol or the like.

Whether or not the AAA server 13 permits the connection between the MS2 and the femto BS7 based on the management contents related to the connection permission of the femto BS7 and the MS2, the MS2 identification information included in the EAP message, and the BSID of the femto BS7. Perform connection authentication and send the connection authentication result to the femto GW12A (step S195).

If the femto GW12A allows the connection between the MS2 and the femto BS7 through the AAA server 13, it uses the EAP forwarding protocol to forward the EAP message of successful authentication to the femto BS7 (step S196).

When the femto BS7 receives the EAP message (EAP transfer) of the successful authentication in step S196, the femto BS7 adds the MAC address of the MS2 of the successful authentication to the access list 33 (step S197).

When the femto BS7 adds the MAC address of the successfully authenticated MS2 to the access list 33, the femto BS7 sends an EAP message of the successfully authenticated MS2 to the MS2 (step S198).

When the femto BS7 sends an EAP message of successful authentication of MS2 to MS2, it executes a registration operation (step S199) and starts communication with MS2 (step S200).

In addition, when the femto GW12A receives the EAP message of the authentication failure of MS2 through the AAA server 13, it sends the authentication failure to MS2 via femto BS7 and reconnects to other femto BS7 or other BS3 to MS2. Will be urged.

In addition, if the MAC address of the MS2 is not in the access list 33, the femto BS7 sends an authentication failure to the MS2 and prompts the MS2 to reconnect to another femto BS7 or another BS3.

Next, the operation when the MS2 shifts to the idle mode after the handover accompanying the movement between the call groups from the femto BS7 to the other BS3 will be described. FIG. 21 is a sequence showing the processing operation inside the wireless communication system 1A when shifting to the idle mode after the handover accompanying the movement between the calling groups from the femto BS7 to the other BS3.

The MS2 shown in FIG. 21 transmits a withdrawal request message to the destination BS3 when shifting to the idle mode after the handover from the femto BS7 to the destination BS3 (step S211) (step S212).

When the destination BS3 receives the withdrawal request message, it sends an idle transition request to the PC unit 52A in the ASN-GW11A as a preparatory step for the MS2 to shift to the idle mode (step S213). The idle transition request includes a source BS, that is, a BSID for identifying the destination BS, a PC ID that identifies the PC unit 52 inside the ASN-GW11A, and MS2 information (various registration information, security information, service flow information, etc.). ) Etc. are included.

The PC unit 52A inside the ASN-GW11A manages the PGID as necessary information about MS2, the PCID that identifies the PC unit 52A inside the ASN-GW11A, the call cycle, etc., so when an idle transition request is received, the idle transition is performed. Send the request to AAA server 13 (step S214).

When the AAA server 13 receives the idle transition request from the ASN-GW11A, it acquires the MS-related information related to the femto BS7 and the femto GW12A connected to the managed MS2 based on the MS2 information included in the idle transition request. Send an idle transition request response containing MS-related information to the ASN-GW11A (step S215).

When the ASN-GW11A receives the idle transition request response, it sends this idle transition request response to the destination BS3 (step S216).

When the destination BS3 receives the idle transition request response from the ASN-GW11A, it sends a withdrawal command message including a call cycle to the MS2 for the withdrawal request message from the MS2 (step S217). As a result, when the MS2 receives the exit command message, it shifts to idle mode (step S218).

When the ASN-GW11A receives the idle transition request response from the AAA server 13 in step S215, the ASN-GW11A identifies the femto GW12A of the femto BS7 to which the MS2 can be connected from the MS2 information acquired in the idle transition request response.

When the ASN-GW11A identifies the femto GW12A of the femto BS7, it transmits the position information of the MS2 to the femto GW12A (step S219). The location information of MS2 includes the PGID of the calling group in which MS2 exists and the BSID of the destination BS3 under which MS2 is subordinate.

When the femto GW12A receives the position information from the ASN-GW11A, the femto GW12A updates the position information of the MS2 to the position registration database 62 (step S220) based on the position information of the MS2, and gives a confirmation response to the position information of the step S219. Send to ASN-GW11A (step S220A).

Further, when the femto GW12A transmits an acknowledgment to the ASN-GW11A, the femto BS transmission control determination process is executed based on the contents of the location registration database 62 (step S221).

When the first condition, the second condition, and the third condition are satisfied through the femto BS transmission control determination process, the command control unit 56 inside the femto GW12A is in an idle state with respect to the femto BS7, that is, stops wireless transmission of control information. A send stop command is sent to the femto BS7 to indicate (step S222).

When the femto BS7 receives the transmission stop command from the femto GW12A, the femto BS7 shifts to an idle state in which the wireless transmission of control information is stopped (step S223). As a result, the femto BS7 can avoid wasting transmission power and causing interference with adjacent cells.

Further, when the femto BS7 shifts to the idle state in which the wireless transmission is stopped, the femto BS7 transmits an acknowledgment indicating the idle state to the femto GW12A (step S224).

When the femto GW12A receives the confirmation response of the idle state from the femto BS7, the femto BS7 status information is updated in the femto BS management table 63 as the idle state.

Next, the operation when the MS2 in the idle mode moves from another BS3 to the BS3 near the femto BS7 between call groups will be described. FIG. 22 is a sequence showing the processing operation inside the wireless communication system 1A accompanying the movement between call groups from another BS3 to BS3 near the femto BS7.

When the MS2 moves from another BS3 to the BS3 near the femto BS7, the MS2 activates its own location registration update operation.

When the MS2 shown in FIG. 22 activates the location registration update operation, it sends a range request message (location registration range request message) including the PCI ID and LU flag to the destination BS3 (step S231).

When the destination BS3 receives the range-up request message from MS2, it sends a location registration request including a PGID and a BSID that identifies itself to the ASN-GW11A based on the PCID included in the range-up request message (step S232).

When the PC unit 52A inside the ASN-GW11A receives the location registration request from the destination BS3, the MS2 related to the MS2 including the CMAC key information that authenticates the validity of the range request message from the MS2 on the destination BS3 side. Determine whether or not the information (security information) is possessed.

If the PC unit 52A inside the ASN-GW11A does not have the MS-related information including the key information, it sends a text request (Context-Req) requesting the transfer of the key information to the AAA server 13 (step S233). ).

Upon receiving the text request, the AAA server 13 receives a text report (Context-Rpt) containing MS-related information, namely femto BS7 and femto GW12A information, along with key information that authenticates the validity of the MS2 range request message. Is transmitted to the PC section 52A inside the ASN-GW11A (step S234).

When the PC unit 52A inside the ASN-GW11A receives the text report, it stores the CMAC key information included in the text report in the location registration request response and sends this location registration request response to the destination BS3 (step S235).

When the destination BS3 receives the location registration request response, it calculates the CMAC of the range registration request message based on the CMAC key information included in the location registration request response, and calculates the calculation result CMAC and the CMAC attached to the range registration request message. And confirm the validity of the range request message.

When the destination BS3 confirms the validity of the range request message from MS2 based on the CMAC comparison result, it sends a range request response including the validity confirmation to MS2 in response to the range request message (step S236). , The location registration confirmation for the location registration request in step S235 is transmitted to the PC unit 52A inside the ASN-GW11A (step S237).

When the PC unit 52A inside the ASN-GW11A receives the location registration confirmation, it updates and registers the location information of MS2 based on the BSID and PGID of the destination BS3 included in the location registration request received earlier in step S232. ..

The ASN-GW11A identifies the femto GW12A of the femto BS7 to which the MS2 can be connected from the MS2 information acquired in the location registration request in step S232.

When the ASN-GW11A identifies the femto GW12A of the femto BS7, it transmits the position information of the MS2 to the femto GW12A (step S238). The location information of MS2 includes the PGID in which MS2 exists and the BSID of the destination BS3 or the destination femto BS7 under which MS2 is subordinate.

When the femto GW12A receives the location information from the ASN-GW11A, it updates the contents of the location registration database 62 based on the location information of the MS2 (step S239) and sends an acknowledgment to the location information to the ASN-GW11A (step S239). Step S240).

Then, when the femto GW12A transmits an acknowledgment to the ASN-GW11A, the femto BS transmission control determination process is executed based on the contents of the location registration database 62 (step S241).

When the 4th condition, the 5th condition and the 6th condition are satisfied through the femto BS transmission control determination process, the femto GW12A transmits the femto BS7 in an active state, that is, to indicate the resumption of wireless transmission of control information. Send a resume command to femto BS7 (step S242).

When the femto BS7 receives the transmission resume command from the femto GW12A, the femto BS7 shifts to the active state of resuming the wireless transmission of the control information (step S242A). As a result, the femto BS7 will resume basic operation as a base station for MS2.

Further, when the femto BS7 shifts to the active state for resuming wireless transmission, the femto BS7 sends an acknowledgment indicating the active state to the femto GW12A (step S243).

When the femto GW12A receives the confirmation response of the active state from the femto BS7, the femto BS7 updates the active state of the femto BS7 as state information in the femto BS management table 63.

Further, when the PC unit 52A inside the ASN-GW11A receives the location registration request from BS3 in step S232, if it has MS-related information including the CMAC key information, the CMAC key information is input in step S235. Send the including location registration request response to the destination BS3.

Next, the operation of the ASN-GW11A when an idle transition request is received from the destination BS3 will be described.

MS2 sends a withdrawal request message to BS3 to which it currently belongs when shifting to idle mode. When the BS3 receives the withdrawal request message, it sends the idle transition request of MS2 to the PC unit 52A in the ASN-GW11A. The idle transition request includes BSID and MS2 information (various registration information, security information, service flow information, etc.) for identifying the source BS.

FIG. 23 is a flowchart showing the processing operation inside the ASN-GW11A related to the idle transition request reception processing.

When the ASN-GW11A shown in FIG. 23 receives an idle transition request from the destination BS3 (step S251), it determines whether or not it has MS-related information related to MS2 of the idle transition request (step S252). It is assumed that the MS-related information includes the CMAC key information in addition to the information of the femto BS7 and the femto GW12A that can be connected to the MS2.

When the ASN-GW11A has the MS-related information related to MS2 (step S252 affirmative), it sends an idle transition request response including the CMAC key information in the MS-related information to the destination BS3 (step S253).

The ASN-GW11A identifies the femto GW12A of the femto BS7 to which the MS2 can be connected from the MS-related information possessed or acquired in the idle transition request response described later.

When the ASN-GW11A identifies the femto GW12A of the femto BS7, it transmits the position information of the MS2 to the femto GW12A (step S254). The location information of MS2 includes the PGID and BSID in which MS2 exists.

When the ASN-GW11A receives the confirmation response from the femto GW12A for the position information (step S255), the processing operation shown in FIG. 23 ends.

If the ASN-GW11A does not have the MS-related information related to MS2 (step S252 denied), the ASN-GW11A sends an idle transition request to the AAA server 13 (step S256).

As a result, when the AAA server 13 receives the idle migration request, it acquires the MS-related information related to MS2 based on the MS2 information included in the idle migration request, and makes an idle migration request response including the acquired MS-related information in ASN-. Send to GW11A.

When the ASN-GW11A receives the idle transition request response (step S257), it acquires the MS-related information related to MS2 included in this idle transition request response, registers the MS-related information related to this MS2 (step S258), and idles. The process proceeds to step S253 in order to send the migration request response to BS3.

In the idle transition request reception process on the ASN-GW11A side shown in FIG. 23, when an idle transition request is received from the destination BS3, it is determined whether or not the MS-related information related to MS2 is possessed, and the MS-related information related to MS2 is determined. If you have, the idle transition request response including the CMAC key information in the MS related information is sent to the destination BS3, so check the validity of the MS2 range request message on the ASN-GW11A side. The key information of the CMAC to be used can be provided to the destination BS3.

In the idle transition request reception process on the ASN-GW11A side, when an idle transition request is received from the destination BS3, it is determined whether or not the MS-related information related to MS2 is possessed, and the MS-related information related to MS2 is retained. If not, the MS-related information is acquired from the AAA server 13, and the idle transition request response including the CMAC key information in the acquired MS-related information is sent to the destination BS3, so the ASN-GW11A side Then, the CMAC key information for confirming the validity of the MS2 range request message can be provided to the destination BS3.

Next, the operation of the femto GW12A when the position information is received from the ASN-GW11A will be described. FIG. 24 is a flowchart showing the processing operation inside the femto GW12A related to the transmission stop processing in response to the reception of the position information.

When the femto GW12A shown in FIG. 24 receives the location information of MS2 from the ASN-GW11A (step S261), the femto GW12A updates the location information of MS2 to the location registration database 62 based on the location information (step S262), and with respect to the location information. Send an acknowledgment to ASN-GW11A (step S263).

Then, based on the contents of the location registration database 62, the pre-movement determination unit 53 inside the femto GW12A existed under the femto BS7 or the BS3 near the femto BS7 before the location registration update MS2 moved to the destination BS3. Determine if the first condition is met (step S264).

In the first connection presence / absence determination unit 54 inside the femto GW12A, when the first condition is satisfied by the pre-movement determination unit 53 (step S264 affirmation), all MS2s that can be connected to the femto BS7 are the same as the femto BS7 and the femto BS7. It is determined whether or not the second condition of being away from BS3 belonging to the PGID is satisfied (step S265).

If the active state determination unit 55 inside the femto GW12A satisfies the second condition in the first connection presence / absence determination unit 54 (step S265 affirmative), whether or not the femto BS7 satisfies the third condition in the active state. Is determined (step S266).

When the active state determination unit 55 satisfies the third condition (step S266 affirmative), the command control unit 56 inside the femto GW12A indicates the femto BS7 to be in an idle state, that is, to stop wireless transmission of control information. Therefore, a transmission stop command is transmitted to the femto BS7 (step S267).

When the femto GW12A receives the confirmation response to the transmission stop command from the femto BS7, that is, the confirmation response of the idle state (step S268), the femto BS7 status information is updated to the femto BS management table 63 as the idle state. ..

In addition, the femto GW12A does not satisfy the first condition in the pre-movement determination unit 53 (step S264 negation), or does not satisfy the second condition in the first connection presence / absence determination unit 54 (step S265 negation). Or, when the active state determination unit 55 does not satisfy the third condition (step S266 negated), the processing operation shown in FIG. 24 is terminated.

In the transmission stop processing on the femto GW12A side shown in FIG. 24, when the location information of MS2 is received via the ASN-GW11A, the contents of the location registration database 62 are updated, and the first condition and the first condition are based on the contents of the location registration database 62. When the 2nd condition and the 3rd condition are satisfied, the transmission stop command is sent to the femto BS7, so that the femto BS7 side can avoid wasting transmission power and giving interference to adjacent cells. it can.

When the MS2 moves to the BS3 near the femto BS7, the MS2 sends a range request message including the PCI ID and the LU flag to the destination BS3. Then, when the destination BS3 receives the range request message from MS2, it sends a location registration request including the PGID and the BSID that identifies itself to the ASN-GW11A.

Therefore, the processing operation inside the ASN-GW11A when the location registration request is received from the destination BS3 will be described. FIG. 25 is a flowchart showing the processing operation inside the ASN-GW11A related to the location registration request reception processing.

In FIG. 25, when the ASN-GW11A receives the location registration request of MS2 from the destination BS3 (step S271), it determines whether or not it has the MS-related information related to MS2 (step S272).

When the ASN-GW11A has MS-related information related to MS2 (step S272 affirmative), it sends a location registration request response to the location registration request to the destination BS3 (step S273).

When ASN-GW11A receives the location registration confirmation for the location registration request response from the destination BS3 (step S274), MS2 is based on the BSID and PGID of the destination BS2 included in the location registration request previously received in step S271. By executing the location registration update of (step S275), the processing operation shown in FIG. 25 is terminated.

In addition, when ASN-GW11A has MS-related information related to MS2 in step S272, it identifies the femto GW12 of femto BS7 to which MS2 can be connected from the information of MS2 acquired by the location registration request, and the femto GW12 of MS2 The location information is transmitted to the femto GW12A (step S276).

Further, when the ASN-GW11A receives an acknowledgment for the position information from the femto GW12A (step S277), the processing operation shown in FIG. 25 ends.

In addition, if ASN-GW11A does not have MS-related information related to MS2 (step S272 denied), AAA makes a text request requesting the transfer of CMAC key information to confirm the validity of the ranging request message from MS2. Send to server 13 (step S278).

When ASN-GW11A receives a text report containing MS-related information of MS2 from AAA server 13 (step S279), it registers the MS-related information contained in the text report (step S280) and confirms the validity of the range request message. In order to send the location registration request response including the key information of the CMAC to be performed to the destination BS, the process proceeds to step S273.

In the location registration request reception process on the ASN-GW11A side shown in FIG. 25, when the location registration request of MS2 from the destination BS3 is received, it is determined whether or not the MS2 related information is possessed, and the MS related information is retained. If so, the idle transition request response including the CMAC key information in the MS related information is sent to the destination BS3, so the ASN-GW11A side confirms the validity of the MS2 range request message. Key information can be provided to the destination BS3.

In the location registration request reception process on the ASN-GW11A side, when a location registration request is received from the destination BS3, it is determined whether or not it has MS-related information, and if it does not have MS-related information, it is AAA. Since the MS-related information is acquired from the server 13 and the location registration request response including the CMAC key information in the acquired MS-related information is sent to the destination BS3, the range request of MS2 is performed on the ASN-GW11A side. CMAC key information for confirming the validity of the message can be provided to the destination BS3.

Next, the processing operation inside the femto GW12A when the position information is received from the ASN-GW11A will be described. FIG. 26 is a flowchart showing the processing operation inside the femto GW12A related to the transmission control processing in response to the reception of position information.

When the femto GW12A receives the location information from the ASN-GW11A in FIG. 26 (step S291), the femto GW12A updates the location information of the MS2 to the location registration database 62 based on the location information (step S292).

The femto GW12A sends an acknowledgment to the location information from the ASN-GW11A to the ASN-GW11 (step S293).

Based on the contents of the location registration database 62, the pre-movement determination unit 53 inside the femto GW12A was present under the femto BS7 or the BS3 near the femto BS7 before the location registration update MS2 moved to the destination BS3. It is determined whether or not the condition is satisfied (step S294).

In the first connection presence / absence determination unit 54 inside the femto GW12A, when the first condition is satisfied by the pre-movement determination unit 53 (step S294 affirmative), all MS2s that can be connected to the femto BS7 are the same as the femto BS7 and the femto BS7. It is determined whether or not the second condition of being away from BS3 belonging to the PGID is satisfied (step S295).

If the active state determination unit 55 inside the femto GW12A satisfies the second condition in the first connection presence / absence determination unit 54 (step S295 affirmative), whether or not the femto BS7 satisfies the third condition in the active state. Is determined (step S296).

When the active state determination unit 55 satisfies the third condition (step S296 affirmative), the command control unit 56 inside the femto GW12A indicates the femto BS7 to be in an idle state, that is, to stop wireless transmission of control information. Therefore, a transmission stop command is transmitted to the femto BS7 (step S297).

When the femto BS7 receives the transmission stop command from the femto GW12A, the femto BS7 shifts to an idle state in which the wireless transmission of control information is stopped. As a result, the femto BS7 stops its basic operation as a base station for the MS2.

When the femto GW12A receives an acknowledgment for a command from the femto BS7 (step S298), for example, when it receives an acknowledgment indicating an idle state for a transmission stop command, the femto BS7 status information is set as an idle state in the femto BS management table 63. Will be updated.

In addition, if the second connection presence / absence determination unit 57 inside the femto GW12A does not satisfy the first condition in the pre-movement determination unit 53 (step S294 denied), before the location registration update MS2 moves under the destination BS3. It is judged that the 4th condition that did not exist under the femto BS7 and the BS3 near the femto BS7 is satisfied, and the 5th condition that the current MS2 is under the BS3 that belongs to the same PGID as the femto BS7 or the femto BS7 is set. It is determined whether or not the condition is satisfied (step S299).

The idle state determination unit 58 inside the femto GW12A determines whether the femto BS7 satisfies the sixth condition in the idle state when the second connection presence / absence determination unit 57 satisfies the fifth condition (step S299 affirmative). (Step S300).

When the idle state determination unit 58 satisfies the sixth condition (step S300 affirmative), the command control unit 56 inside the femto GW12A indicates to the femto BS7 that it is in the active state, that is, restarts wireless transmission of control information. Therefore, the transmission resume command is transmitted to the femto BS7 (step S301), and the process proceeds to step S298.

When the femto BS7 receives the transmission resume command from the femto GW12A, the femto BS7 shifts to the active state of resuming the wireless transmission of the control information. As a result, the femto BS7 will resume basic operation as a base station for MS2.

Then, when the femto GW12A receives an acknowledgment indicating the active state for the transmission restart command from the femto BS7 in step S298, the femto BS7 status information is updated in the femto BS management table 63 as the active state.

In addition, the femto GW12A does not satisfy the second condition in the first connection presence / absence determination unit 54 (step S295 negative), or the active state determination unit 55 does not satisfy the third condition (step S296 negative). Or, when the second connection presence / absence determination unit 57 does not satisfy the fifth condition (step S299 negative), or when the idle state determination unit 58 does not satisfy the sixth condition (step S300 negative), FIG. 26 shows. The processing operation shown is terminated.

In the transmission control process on the femto GW12A side shown in FIG. 26, when the location information of MS2 is received via the ASN-GW11A, the contents of the location registration database 62 are updated, and the first condition and the first condition are based on the contents of the location registration database 62. When the 2nd condition and the 3rd condition are satisfied, the transmission stop command is sent to the femto BS7, so that the femto BS7 side can avoid wasting transmission power and giving interference to the adjacent area. it can.

In the transmission control process on the femto GW12A side, when the location information of MS2 is received via ASN-GW11A, the contents of the location registration database 62 are updated, and based on the contents of the location registration database 62, the fourth condition, the fifth condition, and the fifth condition When the 6 conditions are satisfied, the transmission resume command is transmitted to the femto BS7, so that the femto BS7 side can resume the wireless transmission of the control information.

In the second embodiment, even if the PC unit 52A is arranged inside the ASN-GW11A, when the location information of the MS2 is received via the ASN-GW11A, the contents of the location registration database 62 are updated based on the location information, and the location registration database 62 Based on the contents of, when the 1st condition, the 2nd condition and the 3rd condition are satisfied, the transmission stop command is transmitted to the femto BS7, so that the femto BS7 side wastes the transmission power and is adjacent to the femto BS7. It is possible to avoid interference with the area.

In the second embodiment, when the location information of MS2 is received via the ASN-GW11A, the contents of the location registration database 62 are updated, and the fourth condition, the fifth condition, and the sixth condition are satisfied based on the contents of the location registration database 62. In that case, since the transmission resume command is transmitted to the femto BS7, the wireless transmission of the control information can be resumed on the femto BS7 side.

In the second embodiment, the ASN-GW11A requests the AAA server 13 for MS-related information, for example, information related to the femto GW12A and the femto BS7 related to the MS2, and acquires the MS-related information from the AAA server 13. .. On the other hand, it goes without saying that the same effect can be obtained even if the MS-related information is stored in the MS2 itself and the MS-related information is included in the range request message and transmitted to the BS3 and the ASN-GW11A. No.

Further, in the second embodiment, the femto GW12A holds the neighboring BS of the femto BS7 in the neighboring BS list management table 61, the femto GW12A acquires the position information of the MS2 from the ASN-GW11A, and the femto GW12A itself itself. , The femto BS transmission control determination process is executed based on the neighboring BS and the position information. On the other hand, for example, ASN-GW11A acquires the neighboring BS of the femto BS7 held in the femto GW12A, and the ASN-GW11A itself determines the femto BS transmission control based on the position information of the nearby BS and MS2 of the femto BS7. Needless to say, the same effect can be obtained even if the processing is executed.

In the first and second embodiments, the embodiment in which the MS2 in the idle mode is monitored and the active / idle state of the femto BS7 is controlled has been described.

Next, an embodiment at the time of handover in which the MS2 moves from the femto BS7 to another BS2 during communication via the femto BS7 will be described below as Example 3.

The same configurations as those of the wireless communication system 1 of the first embodiment are designated by the same reference numerals, and the description of the overlapping configurations and operations will be omitted. FIG. 27 is a sequence showing the processing operation inside the wireless communication system 1B associated with the handover from the femto BS7 to another BS3.

When the reception quality of the radio signal from the femto BS7 falls below a certain threshold value, the MS2 activates a handbar (hereinafter, simply referred to as HO) that switches the connection from the femto BS7 to another BS3 having a good reception quality.

When the MS2 detects that the HO has started, it sends an MSHO request (MOB MSHO-REQ) message to the femto BS7 (step S311). In addition, MS2 periodically performs a wireless scan operation to measure the reception quality of wireless signals for femto BS7 and BS3 in the vicinity of MS2 in order to detect the connection destination BS3 and femto BS7 (target BS). Is running.

In addition, the MSHO request message includes a BSID indicating the target BS.

When Femto BS7 receives the MSHO request message from MS2, Femto GW12 (HO-Req) confirms the availability of resources of the connection destination BS3 based on the BSID of the connection destination BS3 included in the MSHO request message. It is transmitted to the connection destination BS3 via step S312) and ASN-GW11 (step S313) (step S314).

When the connection destination BS3 receives the HO request, it determines the presence or absence of bandwidth for guaranteeing the communication quality (Quality of Service: hereinafter simply referred to as QoS) of the MS2 connection, and responds to the HO request including the determination result. (HO-Rsp) is transmitted to femto BS7 via ASN-GW11 (step S315) and femto GW12 (step S316) (step S317).

When the femto BS7 receives the HO request response, it sends an MSHO request response (MOB BSHO-RSP) message containing the information contained in the HO request response to MS2 (step S318).

Further, the femto BS7 transmits an HO acknowledgment (HO-Ack) to the HO request response in step S317 to BS3 via the femto GW12 (step S319) and ASN-GW11 (step S320) (step S321).

When the MS2 receives the MSHO request response message in step S318, it confirms the HO execution to the connection destination BS3 and sends the MSHO execution instruction (MOB HO-IND) message including the BSID of the new connection destination BS3 to the femto BS7. Send (step S322).

When the femto BS7 receives the MSHO execution instruction message, the HO confirmation notification (HO-Cnf (Confirm)) at which MS2 starts HO is sent to the new connection destination BS3 via the femto GW12 (step S323) and ASN-GW11 (step S324). Send to (step S325).

Further, when the femto GW12 receives the HO confirmation notification from the femto BS7 in step S323, the femto GW12 updates the location information of MS2 to the location registration database 62 (step S326) based on the HO confirmation notification, and adds the contents of the location registration database 62. Based on this, the femto BS transmission control determination process is executed (step S327).

When the first condition, the second condition, and the third condition are satisfied through the femto BS transmission control determination process, the femto GW12 transmits the femto BS7 in an idle state, that is, to indicate the stop of wireless transmission of control information. Send a stop command to femto BS7 (step S328).

The first connection presence / absence determination unit 54 determines whether or not all MS2s that can be connected to the femto BS7 satisfy the second condition that the femto BS7 and the BS3 that belongs to the same PGID as the femto BS7 satisfy the second condition. It may be determined based on whether or not all the connections for MS communication set with the femto BS7 have been switched to another BS3, that is, whether or not there is a connection.

When the femto BS7 receives the transmission stop command from the femto GW12 in step S328, the femto BS7 shifts to an idle state in which the wireless transmission of control information is stopped (step S329). As a result, the femto BS7 can avoid wasting transmission power and causing interference with adjacent cells.

Further, when the femto BS7 shifts to the idle state in which the wireless transmission is stopped in step S329, the femto BS7 transmits an acknowledgment indicating the idle state to the femto GW12 (step S330). As a result, when the femto GW12 receives the confirmation response of the idle state, the femto BS7 status information is updated to the femto BS management table 63 as the idle state.

Further, when the destination BS3 receives the HO confirmation notification from the femto BS7 via the femto GW12 and ASN-GW11 in step S325, the destination BS3 sends the HO confirmation response to the HO confirmation notification to the ASN-GW11 (step S331) and femto GW12 (step). Send to femto BS7 via S332) (step S333).

Then, the MS2 is completely moved from the femto BS7 to the destination BS3 (step S334), so that the MS2 is accommodated and connected to the destination BS3.

In Femto GW12, a method of detecting the absence of MS2 under Femto BS7 based on the presence or absence of a connection for MS communication has been described. For example, Femto BS7 itself detects the presence or absence of a connection, and based on the presence or absence of this connection, Needless to say, it is possible to autonomously shift to the idle state or request the femto GW12 to shift to the idle state.

FIG. 28 is a sequence showing the processing operation inside the wireless communication system 1B associated with the handover related to the movement between call groups from another BS3 to the femto BS7.

When the reception quality of the radio signal from BS3 falls below a certain threshold, MS2 activates HO to switch the connection from BS3 to femto BS7 with good reception quality.

When MS2 detects the HO start, it sends an MSHO request message to BS3 (step S341).

When BS3 receives the MSHO request message from MS2, it makes an HO request to confirm the availability of resources of the connection destination femto BS7 based on the BSID of the connection destination femto BS7 included in the MSHO request message ASN-GW11 (step S342). And it is transmitted to the connection destination femto BS7 via the femto GW12 (step S343) (step S344).

When the femto BS7 receives the HO request, it determines whether or not there is a band for guaranteeing the QoS of the MS2 connection, and sends the HO request response including the determination result to the femto GW12 (step S345) and ASN-GW11 (step S346). ) To BS3 (step S347).

When the BS3 receives the HO request response, it sends an MSHO request response message containing the information contained in the HO request response to MS2 (step S348), and sends an HO acknowledgment to the HO request response to ASN-GW11 (step S349) and Send to femto BS7 via femto GW12 (step S350) (step S351).

When the MS2 receives the MSHO request response message from BS3 in step S348, it confirms the HO execution to the connection destination femto BS7 and sends the MSHO execution instruction message including the BSID of the new connection destination femto BS7 to BS3. (Step S352).

Upon receiving the MSHO execution instruction message, BS3 sends an HO confirmation notification that MS2 starts HO to the new connection destination femto BS7 via ASN-GW11 (step S353) and femto GW12 (step S354) (step S355).

When the femto GW12 receives the HO confirmation notification from BS3 in step S354, the femto GW12 updates the location information of MS2 to the location registration database 62 based on the HO confirmation notification (step S356), and performs the femto BS transmission control determination process. Execute (step S357).

When the fourth condition, the fifth condition, and the sixth condition are satisfied through the femto BS transmission control determination process, the femto GW12 transmits the femto BS7 in an active state, that is, to indicate the resumption of wireless transmission of control information. Send a resume command to femto BS7 (step S358).

When the femto BS7 receives the transmission resume command from the femto GW12, the femto BS7 shifts to the active state of resuming the wireless transmission of the control information (step S359). As a result, the femto BS7 can resume wireless transmission.

Further, when the femto BS7 shifts to the active state of resuming wireless transmission, the femto BS7 sends an acknowledgment indicating the active state to the femto GW12 (step S360).

When the femto GW12 receives the confirmation response of the active state from the femto BS7, the femto BS7 status information is updated in the femto BS management table 63 as the active state.

Further, the femto BS7 transmits an HO confirmation response to the HO confirmation notification to the BS3 via the femto GW12 (step S361) and ASN-GW11 (step S362) (step S363).

In FIG. 28, the sequence of shifting the state of the femto BS7 from the idle state to the active state during the handover from BS3 to the femto BS7 has been described, but the scan in which the MS2 measures the reception quality of the radio signals of other BS3s. Needless to say, the state of the femto BS7 may be changed from the idle state to the active state at the time of measurement.

Further, as shown in FIGS. 27 and 28, the transmission control process on the femto GW12 side when the HO confirmation notification is received in response to the HO activation of MS2 will be described. FIG. 29 is a flowchart showing the processing operation inside the femto GW12 related to the transmission control processing in response to the reception of the HO confirmation notification.

In FIG. 29, the femto GW12 receives the HO confirmation notification from the ASN-GW11 or the femto BS7 (step S371). When the femto GW12 receives the HO confirmation notification from the femto BS7 in step S371, the femto GW12 forwards the HO confirmation notification to BS3 via the ASN-GW11 (step S372).

Further, when the femto GW12 receives the HO confirmation notification from the ASN-GW11 in step S371, the femto GW12 forwards the HO confirmation notification to the femto BS7 in step S372.

When the pre-movement determination unit 53 inside the femto GW12 transfers the HO confirmation notification, it is placed under the femto BS7 or the BS near the femto BS7 before the MS2 of the HO moves under the destination BS3 based on the connection information of the managed MS2. It is determined whether or not the existing first condition is satisfied (step S373).

In the first connection presence / absence determination unit 54 inside the femto GW12, when the first condition is satisfied by the pre-movement determination unit 53 (step S373 affirmative), all MS2s that can be connected to the femto BS7 are the same as the femto BS7 and the femto BS7. It is determined whether or not the second condition of being away from BS3 belonging to the PGID is satisfied (step S374).

If the active state determination unit 55 inside the femto GW12 satisfies the second condition in the first connection presence / absence determination unit 54 (step S374 affirmative), whether or not the femto BS7 satisfies the third condition in the active state. Is determined (step S375).

When the active state determination unit 55 satisfies the third condition, the command control unit 56 inside the femto GW12 indicates the femto BS7 to be in an idle state, that is, to stop the wireless transmission of control information. To femto BS7 (step S376).

When the femto BS7 receives the transmission stop command from the femto GW12, the femto BS7 shifts to an idle state in which the wireless transmission of control information is stopped. As a result, the femto BS7 can avoid wasting transmission power and causing interference with adjacent cells.

Further, when the femto GW12 receives the confirmation response to the command from the femto BS7, for example, the confirmation response of the idle state to the transmission stop command (step S377), the femto BS7 status information is set to the idle state and the femto BS management table 63 is updated. Then, the processing operation shown in FIG. 29 is terminated.

In addition, if the second connection presence / absence determination unit 57 inside the femto GW12 does not satisfy the first condition in the pre-movement determination unit 53 (step S373 is denied), before the location registration update MS2 moves under the move destination BS3. It is judged that the fourth condition that did not exist under femto BS7 or BS3 near femto BS7 was satisfied, and the current MS2 satisfied the fifth condition that exists in BS3 that belongs to the same PGID as femto BS7 or femto BS7. Whether or not it is determined (step S378).

When the fifth condition is satisfied (step S378 affirmative), the idle state determination unit 58 inside the femto GW12 determines whether or not the femto BS7 satisfies the sixth condition in the idle state (step S379).

When the idle state determination unit 58 satisfies the sixth condition (step S379 affirmative), the command control unit 56 inside the femto GW12 indicates to the femto BS7 that it is in the active state, that is, restarts wireless transmission of control information. Therefore, the transmission resume command is transmitted to the femto BS7 (step S380), and the process proceeds to step S377.

When the femto BS7 receives the transmission resume command from the femto GW12, the femto BS7 shifts to the active state of resuming the wireless transmission of the control information. As a result, the femto BS7 will resume basic operation as a base station for MS2.

Then, when the femto GW12 receives the confirmation response of the active state to the transmission restart command in step S380, the femto BS7 status information is updated in the femto BS management table 63 as the active state.

Further, in the femto GW12, when the first connection presence / absence determination unit 54 does not satisfy the second condition (step S374 is denied), or when the active state determination unit 55 does not satisfy the third condition (step S375 is denied). Or, when the second connection presence / absence determination unit 57 does not satisfy the fifth condition (step S378 negation), or when the idle state determination unit 58 does not satisfy the sixth condition (step S379 negation), FIG. 29 shows. The processing operation shown is terminated.

In the transmission control process on the femto GW12 side shown in FIG. 29, when the HO confirmation notification of MS2 is received, the contents of the location registration database 62 are updated, and the first condition, the second condition, and the second condition are updated based on the contents of the location registration database 62. When the three conditions are satisfied, the transmission stop command is transmitted to the femto BS7, so that the femto BS7 side can avoid wasting transmission power and giving interference to adjacent cells.

In the transmission control process on the femto GW12 side, when the HO confirmation notification of MS2 is received, the contents of the location registration database 62 are updated, and the fourth condition, the fifth condition, and the sixth condition are satisfied based on the contents of the location registration database 62. In that case, since the transmission resume command is transmitted to the femto BS7, the wireless transmission of the control information can be resumed on the femto BS7 side.

In the third embodiment, when the HO confirmation notification of the MS2 is received at the time of the handover of the MS2, the contents of the location registration database 62 are updated, and the first condition, the second condition, and the third condition are set based on the contents of the location registration database 62. When the condition is satisfied, the transmission stop command is transmitted to the femto BS7, so that the femto BS7 side can avoid wasting transmission power and giving interference to adjacent cells.

In the third embodiment, when the HO confirmation notification of the MS2 is received at the time of the handover of the MS2, the contents of the location registration database 62 are updated, and the fourth condition, the fifth condition, and the sixth condition are set based on the contents of the location registration database 62. When the condition is satisfied, the transmission resume command is transmitted to the femto BS7, so that the femto BS7 side can resume the wireless transmission of the control information.

In the first to third embodiments, the pre-movement determination unit 53 satisfies the first condition, the first connection presence / absence determination unit 54 satisfies the second condition, and the active state determination unit 55 is the first. The transmission stop command is sent to the femto BS7 when the three conditions are met, but the transmission stop command is sent when the second condition is met even if the first and third conditions are not met. You may. Further, the femto BS7 that has received the transmission stop command may intermittently transmit the control information wirelessly instead of completely stopping the wireless transmission of the control information until the transmission restart command is received.

Further, in the above-described first to third embodiments, the pre-movement determination unit 53 satisfies the fourth condition, the second connection presence / absence determination unit 57 satisfies the fifth condition, and the idle state determination unit 58 is the fifth condition. The transmission restart command is sent to the femto BS7 when the 6 conditions are met, but the transmission restart command is sent when the 5th condition is met even if the 4th and 6th conditions are not met. You may.

Although the embodiments of the present invention have been described above, the scope of the technical idea of the present invention is not limited by the present embodiment, and various types are provided as long as they do not deviate from the scope of the technical idea described in the claims. It goes without saying that various embodiments are feasible. Moreover, the effect described in this example is not limited to this.

In addition, it is of course possible to manually perform all or part of the various processes described in this embodiment, which are described as being automatically performed, and vice versa. It goes without saying that it is possible to automatically perform all or part of the processing described as being done. Needless to say, the processing procedure, control procedure, specific name, and information including various data and parameters described in this embodiment can be changed as appropriate unless otherwise specified.

Further, each component of each of the illustrated devices is described in a functional concept, and is not necessarily physically configured as shown in the figure. Specific embodiments of the devices are shown in the figure. It goes without saying that it cannot be limited.

Furthermore, various processing functions performed by each device are performed on a CPU (Central Processing Unit) (or a micro computer such as an MPU (Micro Processing Unit) or MCU (Micro Controller Unit)), or on the same CPU (or MPU, MCU, etc.). Needless to say, all or any part of the program may be executed on the program to be analyzed and executed by the (microcomputer), or on the hardware by the wired logic.