Power control method and signaling method of tfci field against shared downlink channel in mobile communication system

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a power control method for a mobile communication system, and more particularly to a method for performing power control using TFCI for a downlink shared channel depending on the handover status, the number of wireless links, and the number of base stations that send TFCI2.

【0002】

[Conventional technology]

FIG. 1 is a drawing showing the structure of a wireless connection network during a conventional soft-handover (Intra RNS, Inter Node B Soft-handover) between base stations in the same control station (RNC). According to FIG. 1, the serving control station (SRNC: Serving RNC, 106) existing in the UMTS radio network (102) below the core network (101) is the serving radio network subsystem (SRNS: Serving Radio Network Subsystem, 104). Manages dedicated radio resources assigned to each mobile station (UE, 110) within. At this time, the mobile station (110) is one base station (Node B, 108) in the serving control station (106) and another base station (Node). When moving to B, 109), the base station (108, 109) demodulates each signal received from the mobile station (110) and sends the demodulated frame to the serving control station (106). There, the serving control station (106) can select the highest frame among the transmitted and received frames. In this way, the mobile station (110) can communicate with two base stations (108, 109) at the same time while moving to sustainably maintain a call channel. Here, the serving control station (106), the base station and the like (108, 109) are included in the serving radio network subsystem (104).

【0003】

FIG. 2 is a drawing showing the structure of a wireless connection network at the time of soft handover between control stations different from each other in the past. According to FIG. 2, the UMTS wireless connection network (102) has a plurality of base stations (108, 109, 116, 118), each of which is a serving control station (SRNC, 106) and a destination control station (DRNC, 114). Under the controlled wireless environment, the call channel is simultaneously set to each base station (109, 116) existing in the two control stations (106, 114) when the mobile station (110) is in soft-handover. maintain. Here, the serving control station (106) manages the dedicated radio resources assigned to each mobile station, and the destination control station (DRNC, 114) is the mobile station (110) serving the serving control station (106). When moving out of the control area range of the above to the own area, the radio resource is provided to the mobile station (110). The serving control station (106) and the destination control station (114) are present in the serving radio network subsystem (SRNS, 104) and the destination radio network subsystem (DRNS, 112), respectively.

【0004】

As described above, there are a plurality of base stations under each control station (106, 114), and the mobile station (110) at the time of soft handover belongs to each of these two control stations. Maintain transmission at the same time as the base station of. At this time, in each case, even if a handover is established from one of the base stations to a new base station, the mobile station always communicates with a minimum of two base stations in two other cells. ..

【0005】

The 3GPP system has a Downlink Shared CHannel (DSCH) as a channel for burst data type transmission.

【0006】

FIG. 3 is a drawing showing the configuration of the downlink shared channel. In Figure 3, the downlink shared channel consists of a 10 ms radio frame, which may be shared and used by different users for each frame. It allows a large number of users to be assigned a channelization code for a downlink shared channel. On the other hand, even after the downlink sharing channel has been shared by a large number of users, a code having a constant data transmission rate at a specific moment can be used by only one user. Therefore, the downlink shared channel occupied by the specific mobile station is controlled by the mobile station that occupies the channel.

【0007】

In general, a downlink shared channel can always operate in cooperation with a dedicated channel (DCH). That is, the mobile station that occupies the downlink shared channel always has a dedicated channel. According to general power control, a mobile station measures the power of a dedicated channel transmitted from a base station, and will generate a transmit power control (TPC) command in the future and send it to the base station. As a result, the base station updates the power of the dedicated channel based on the transmission power control command. In addition, the base station can update the power of the downlink shared channel by using the updated dedicated channel power. A dedicated channel that operates together with the downlink shared channel in this way is called an associated dedicated channel (associated DCH).

【0008】

FIG. 4 is a drawing showing the configuration of a dedicated channel. According to Figure 4, the dedicated channel has a frame period (T)._f) Is composed of 10ms wireless frames, and each wireless frame contains 15 slots (Slot # 0 to Slot # 14). Here, one slot length (T_slot) Is 2560 chips. Further, in the dedicated channel, a physical data channel (DPDCH: Dedicated Physical Data CHannel) and a physical control channel (DPCCH: Dedicated Physical Control CHannel) are intervened with each other. Here, the physical control channel is TPC (N)._TPC Bit field, TFCI (N)_TFCIIt can include bit fields and pilot fields. Here, the TFCI field contains information for the channel currently being transmitted. For example, the TFCI field can transmit information about the amount of data currently transmitted to the radio frame, the coding method, and the like.

【0009】

When the data of one user is transmitted to one user at the same time through the dedicated channel and the downlink shared channel, the TFCI information for the dedicated channel (hereinafter referred to as TFCI1) and the TFCI for the downlink shared channel are used by the TFCI field. Information (called TFCI2) can be transmitted at the same time. To this end, the TFCI field can divide the bits contained in the TFCI field transmitted per slot into two, one for TFCI1 and the other for TFCI2. ..

【0010】

There are two methods for sending the TFCI1 and the TFCI2. That is, the first method is when TFCI1 and TFCI2 are transmitted by forming one code word based on one coding (second order Reed Muller coding). This is called Logical SPlit Mode. The second method is when TFCI1 and TFCI2 form different codewords through their respective coding (first order Reed Muller coding), and the bits of the two codewords formed by this are mixed and transmitted. is there. This is in hard split mode (Hard SPlit) Mode). Here, the second method is used to send TFCI2 when the dedicated channels are transmitted by the base stations at different control stations (RNCs) from each other. In this case, TFCI2 can transmit only part of the entire wireless link. That is, TFCI2 is not transmitted at a control station different from the control station that sends the downlink shared channel. Therefore, there has been a proposal to make the power control in TFCI1 and TFCI2 different in the hard split mode, but one of them uses the power control method of the downlink shared channel.

【0011】

In general, dedicated channels support soft handover, whereas downlink shared channels do not support soft handover. Therefore, when the dedicated channel is in the soft handover situation and the downlink shared channel is transmitted only by one base station, different power controls are required for both. That is, the dedicated channel generates a TPC instruction by combining the powers coming from many base stations, but since the downlink shared channel is transmitted from one base station, the power control of the downlink shared channel is performed through the power control by the TPC instruction. I can't carry it out. For this reason, a power control method different from the conventional power control must be applied to the downlink shared channel.

【0012】

There are two possible methods for controlling the power of such a downlink shared channel. That is, the first method makes SSDT work only on the uplink. When a mobile station is soft-handovered, the mobile station measures the power of each base station using SSDT, selects the base station having the largest received power as the primary base station, and then performs this. Is sent to the base station through physical signaling. At this time, each base station or the like continuously sends information when it is set as the main base station, but a non-primary base station or the like interrupts the transmission. Here, operating only on the uplink means that the signal for selecting the main base station is transmitted on the uplink, but ON / OFF of the power on the downlink does not operate.

【0013】

At this time, the power control of the downlink shared channel can operate in two modes. If the base station to which the downlink shared channel is currently transmitted is the main base station, the power is transmitted to a certain level higher than the reference power, which changes the power according to the TPC instruction generated by the dedicated channel. be able to. On the other hand, a higher power offset can be assigned if the base station sending the downlink shared channel is not the main base station. Such a power offset value can be set high enough to be received in all areas of the cell.

【0014】

The second method is a method in which the mobile station generates a TPC instruction for a dedicated channel and a TPC instruction for a downlink shared channel and transmits them to the base station. However, the second method has the problem that the mobile station must measure not only the power for the dedicated channel but also the power for the downlink shared channel.

【0015】

The downlink power control process will be described in more detail below. First, the mobile station measures the signal-to-interference ratio (SIR) of the dedicated channel and compares the measured signal-to-interference ratio (SIRest) with the target signal-to-interference ratio (SIR target). If the measured signal-to-interference ratio (SIRest) is greater than the target signal-to-interference ratio (SIRtarget) (SIRest> SIRtarget), the mobile station sends a "0" TPC instruction at the base station. On the other hand, when the measured signal-to-interference ratio (SIRest) is smaller than the target signal-to-interference ratio (SIRtarget) (SIRest <SIRtarget), the mobile station can transmit a TPC instruction of "1". Then, the base station adjusts the power of the dedicated channel as follows based on the received TPC instruction.

【0016】

P (k) = P (k-1) + P_TPC(k) <Equation 1> That is, the power P (k) of the current dedicated channel is the power P (k-1) adjusted by the TPC instruction in the previous power P (k-1)._TPCAdjust (k). That is, when TPCest (k) = 1, P_TPCWhen (k) = + ΔTPC and TPCest (k) = 0 P_TPC(k) =-ΔTPC. When the measured SIRest is smaller than the target SIR target, the power of the dedicated channel is increased by + ΔTPC, but when the measured SIRest is larger than the target SIR target, the power of the dedicated channel is decreased by + ΔTPC.

【0017】

Based on the power P (k) of the current dedicated channel, the power P of the TFCI field of the physical control channel_TFCI(k) can be expressed by the following equation.

【0018】

P_TFCI(k) = P (k) + PO1 <Equation 2> Here, PO1 means the power offset between the physical data channel and the TFCI field. That is, the power in the TFCI field of the physical control channel has the value obtained by adding the power offset (PO1) to the power of the current dedicated channel.

【0019】

Hereinafter, the method of signaling the power offset described above will be described.

【0020】

In general, communication protocols can be classified into a control plane (Control Plane, Fig. 5) and a user plane (User Plane, Fig. 6). This is because it is common for the entire system to distinguish between the intended control signaling for control and the actual end-user data. The control plane protocol is a protocol used in a radio network among UMTS protocols, as shown in FIG. 5, RRC (Radio Resource Control), RANAP (Radio Access Network Application Part), RNSAP (Radio Network Subsystem Application Part), There are NBAP (NodeB Application Part) and so on.

【0021】

According to Figure 5, the protocol used between the mobile station (UE) and the control station (RNC) is the RRC protocol, which is used for the lub interface between the base station (Node B) and the control station (RNC). The protocol is NBAP, the protocol used for the lur interface between the control station (RNC) and the control station (RNC) is RNSAP, and the protocol used for the lu interface between the control station (RNC) and the core network (CN) is RANAP. Such a wireless network control plane protocol exists in a client-server environment. That is, in the lu interface, UTRAN acts as a wireless connection server, and the core network (CN) It acts as a client that requests connection services from UTRAN. Similarly, in the lub interface, the base station acts as the server, the control station (RNC) acts as the client, and in the lur interface, the destination control station (DRNC) acts as the server and serves as the serving control station (SRNC). Acts as a client requesting control services for remote base stations and the like. Such protocols include all between the base station and the control station (RNC), between the control station (RNC) and the control station (RNC), and between the core network (CN) and the control station (RNC). It can contain various control messages for the resources of the Radio Access Bearer that spans the interval.

【0022】

On the other hand, in the user plane protocol, there is a frame protocol (FP) for carrying UMTS user data frames. Again, there are protocols such as lubFP, lurFP and luUP (User Plane Protocol) between each interface as shown in Figure 6. Such a frame protocol (FP) carries out many control techniques other than uplink and downlink data transmission. In the control technology provided by such a frame protocol, there are technologies such as time adjustment and synchronization that play an important role in asynchronous CDMA. In addition to that, an outer loop power control command can be transmitted by the mobile station.

【0023】

Figure 7 shows the types of control frames used in the user plane protocol for dedicated channels on the 3GP Pllur / lub interface. According to Figure 7, the control frames are external loop power control, time adjustment, DL synchronization, UL synchronization, DL signaling for downlink shared channels, DL node synchronization, UL node synchronization, RX time deviation, radio. There are 10 types such as RADIO INTERFACE PARAMETER UPDATE and timing advance, and each control frame can be distinguished by 8-bit coding information. Among the control frames, the wireless interface parameter update includes 8-bit concatenated frames (CFN), 5-bit transmit power control (TPC) power offset, and 1-bit downlink power control (DPC), as shown in FIG. It is used when updating the mode information. The control frame format consists of a 4-byte payload in total.

【0024】

On the other hand, sending control signaling using the control plane on the user plane has the advantage that it can react faster than sending signaling using the control plane, and the size of the message is smaller. However, when the control signaling is sent by using the control frame on the user plane, there is a disadvantage that the signaling is unreliable and transmitted. The control information transmitted in the normal control plane (Control Plane) is called a "control message", and the control information transmitted in the user plane is called a "control frame".

【0025】

FIGS. 9a to 9d show the channel connection state of each base station and mobile station by the hard handover of the downlink shared channel or the soft handover of the associated dedicated channel when the mobile station moves to a new control station. It is an exemplary figure. That is, FIG. 9a shows before the soft handover of the dedicated channel associated with the downlink shared channel occurs, and FIG. 9b shows the soft handover of the dedicated channel associated with the downlink shared channel and the occurrence of the downlink shared channel hard handover. In front of, FIG. 9c shows the occurrence of the hard handover of the downlink shared channel, and FIG. 9d shows the end state of the soft handover of the dedicated channel associated with the downlink shared channel.

【0026】

In addition, FIGS. 10a and 10b show when the soft handover of the linked dedicated channel and the hard handover of the downlink shared channel generated by the movement of the mobile station (UE) together with FIGS. 9a and 9b do not occur. Is the traditional Signaling Procedure of.

【0027】

[Problems to be Solved by the Invention]

Therefore, as described above, the conventional downlink shared channel power control method can be applied to the power control of TFCI2. Since the TFCI field is a field included in the physical control channel, power control equivalent to that of the physical control channel is established. As described above, the TFCI field can be sorted into TFCI1 and TFCI2. However, in the downlink shared channel hard split mode, the TFCI for the downlink shared channel may not be transmitted at all base stations, resulting in a decrease in TFCI performance. That is, since the TFCI field is transmitted including information such as the number of data bits of the frame currently transmitted and the coding method, if the reception of the TFCI field is not properly established, the data of the wireless frame is correct. Cannot be detected. In other words, if the TFCI field cannot be received correctly, information about the spreading factor and data volume of the downlink shared channel will not be transmitted properly.

【0028】

On the other hand, when the mobile station is in a soft handover situation, the power control is based on the sum of the power transmitted by all the base stations forming the Active Set. However, TFCI2 is not transmitted at all base stations, but is transmitted only at some base stations, as already fully explained above. Therefore, when power control is established, it is not easy to maintain the power of TFCI2 at a constant quality.

【0029】

In the conventional power control method, the power offset of the TFCI field for the dedicated physical channel (DPCH) can be set only at the time of wireless link setup. The power control of the dedicated physical channel can be established based on the set power offset. That is, the power offset of the TFCI field for a dedicated physical channel can only be changed during wireless link setup, so other power can be allocated if the channel environment or the configuration of the base station that forms the wireless link changes. Can not.

【0030】

Also, according to the conventional method, a high power offset can be assigned to the TFCI field to maintain the quality of the TFCI field, but this is just fixing the power of the TFCI field rather than adjusting it. Power can be over-consumed.

【0031】

As described above, traditional signaling procedures do not perform separate power control for TFCI in downlink shared channel hard split mode, and the power offset for TFCI is independent of the movement of the mobile station and the number of radio links sending TFCI2. Instead, I always used the TFCI power offset in the control plane NBAP and RNSAP messages when setting up the radio link for the first time.

【0032】

Therefore, along with the above, a proposal has been made to separately perform power control for TFCI in the downlink shared channel hard split mode, but it is still practical in the 3GPP wireless network (RAN) interface standard. The reality is that there is no way to make this possible.

【0033】

Further, for TFCI power control in such a downlink shared channel hard split mode, between the base station (Node B) and the control station (RNC) and between the control station (RNC) and the control station (RNC). In the meantime, there is a need for a method of transmitting the control message as described above. However, until now, it has not been defined how to transmit the power control instruction to TFCI in such downlink shared channel hard split mode, and the concrete operation procedure by it is also defined. I wasn't. Accordingly, conventional techniques can cause a lot of confusion in manufacturing 3GPP asynchronous systems and terminals that perform power control for TFCI in downlink shared channel hard split mode.

【0034】

An object of the present invention is to provide a method for increasing the reliability of control information for a downlink shared channel by adding an additional control signal in order to solve the above-mentioned problems. ..

【0035】

Another object of the present invention is to provide a method for controlling the transmission power of control information for a downlink shared channel when additional control signals are not available.

【0036】

Another object of the present invention is to provide a method for performing power control using TFCI for a downlink shared channel depending on the handover situation, the number of radio links, and the number of base stations sending TFCI2.

【0037】

At the same time, another object of the present invention is to provide a signaling method for directing the power offset set by the power control method to the control plane or the user plane.

【0038】

[Means for solving problems]

In the control information transmission method for the downlink shared channel of the present invention, the first base station sends data to a plurality of mobile stations through any one communication channel, and the control information for the communication channel is transmitted through at least one control channel. In the transmitting wireless communication system, any one of the plurality of mobile stations communicates with the second base station, and the second base station sends data to the plurality of mobile stations through its own downlink shared channel. In the case of a base station that sends control information for its own downlink shared channel through a control channel, the second base station sends control information for the downlink shared channel of the first base station to the mobile station. It is a feature.

【0039】

The control information transmission method for the downlink shared channel of the present invention may be characterized in that the control information for the downlink shared channel of the first base station is transmitted from the first base station to the second base station.

【0040】

In the control information transmission method for the downlink shared channel of the present invention, the transmission of the control information is performed between the first control station that controls the first base station and the second control station that controls the second base station. It may be characterized by being carried out.

【0041】

The control information transmission method for the downlink shared channel of the present invention may be characterized in that the first control station transmits the control information to the second control station by using the control frame on the user plane.

【0042】

The control information transmission method for the downlink shared channel of the present invention may be characterized in that the first control station transmits the control information at the first base station using a control frame on the user plane.

【0043】

The control information transmission method for the downlink shared channel of the present invention may be characterized in that the first control station transmits the control information to the second control station by using a control message on the control plane.

【0044】

The control information transmission method for the downlink shared channel of the present invention may be characterized in that the first control station transmits the control information at the first base station by using a control message on the control plane.

【0045】

In the control information transmission method for the downlink shared channel of the present invention, when the first base station is the main base station, the transmission of the channel including the control information depends on whether or not the SSDT mode of the mobile station operates. It may be characterized by different electric powers.

【0046】

The control information transmission method for the downlink shared channel of the present invention may be characterized in that when the SSDT mode is not operated in the mobile station, the first base station is set to a non-main base station.

【0047】

In the control information transmission method for the downlink shared channel of the present invention, when the first base station is set to a non-main base station, the transmission power of the channel containing the control information is increased by a certain amount and transmitted. May be a feature.

【0048】

In the control information transmission method for the downlink shared channel of the present invention, the transmission power of the channel including the control information is adjusted based on the transmission power control command generated from the transmission power of the communication channel of the first base station. It may be characterized by being done.

【0049】

In the control information transmission method for the downlink shared channel of the present invention, the first base station sends data to a plurality of mobile stations through any one communication channel, and the control information for the communication channel is transmitted through at least one control channel. In the wireless communication system to be transmitted, any one of the plurality of mobile stations communicates with the second base station, and the second base station controls the downlink shared channel of the first base station to the mobile station. When the information is not transmitted, the transmission power of the channel including the control information transmitted by the first base station may be increased.

【0050】

The control information transmission method for a downlink shared channel according to claim 12, wherein the control information transmission method for the downlink shared channel of the present invention is characterized in that the degree of increase in the transmission power is preset.

【0051】

In the control information transmission method for the downlink shared channel of the present invention, when the second base station is one of the active base stations subject to handover, increasing the transmission power is an active base station that does not transmit control information. It may be characterized by the ratio of the number of base stations to the total number of active base stations.

【0052】

The control information transmission method for the downlink shared channel of the present invention may be characterized in that control information is transmitted from the first base station to the second base station.

【0053】

In the control information transmission method for the downlink shared channel of the present invention, the transmission of the control information is performed between the first control station that controls the first base station and the second control station that controls the second base station. It may be characterized by being carried out.

【0054】

The control information transmission method for the downlink shared channel of the present invention is also characterized in that the first control station determines whether or not to transmit the control information and provides the control information to the first base station. Good.

【0055】

In the control information transmission method for the downlink shared channel of the present invention, when the second base station is one of the active base stations to be handed over, any one of the plurality of mobile stations is the third base. When the third base station communicates with the station through the control channel and the third base station sends control information for the communication channel of the first base station to the mobile station, the control information sent by the third base station is included. It may be characterized in that the transmission power of the channel is increased by a certain amount.

【0056】

The control information transmission method for the downlink shared channel of the present invention may be characterized in that increasing the transmission power depends on the ratio of the number of base stations transmitting the control information to the total number of active base stations.

【0057】

The power control method of the TFCI field for the downlink shared channel of the present invention is a mobile communication system including a serving control station and a destination control station that each manage a plurality of base stations, and the downlink shared channel and the associated dedicated channel are soft. In the handover situation, in the method of controlling the power of the TFCI field for the downlink shared channel, the number of base stations that send TFCI2 depends on whether or not the base station that sends the downlink shared channel is the main base station. The stage of judgment and here, the TFCI2 shows information for the downlink shared channel, and the stage of setting different power offsets depending on the judgment result, and the stage of sending TFCI2 using the set power offset. It is characterized in that it is established including stages.

【0058】

In the power control method of the TFCI field for the downlink shared channel of the present invention, when the base station that sends the downlink shared channel is the main base station, different power control is performed depending on whether or not the SSDT mode operates in the mobile station. It may be characterized by being established.

【0059】

The power control method of the TFCI field for the downlink shared channel of the present invention is that when the mobile station operates in SSDT mode, the power of the TFCI field is contained in the dedicated physical control channel of the dedicated channel. It may be characterized by being equal to.

【0060】

In the power control method of the TFCI field for the downlink shared channel of the present invention, when the base station that sends the downlink shared channel is a non-primary base station, the power of the TFCI field is preset. It may be characterized by that.

【0061】

The method of controlling the power of the TFCI field for the downlink shared channel of the present invention is that when the mobile station does not operate the SSDT mode, the power of the TFCI field is mainly transmitted to the preset power regardless of the main base station. It may be characterized by being set to no base station.

【0062】

In the power control method of the TFCI field for the downlink shared channel of the present invention, the power offset (TFCIPO, TFCIPO_primary) set by whether or not the base station sending the downlink shared channel is the main base station is the control frame of the user plane. It may be characterized by being added to.

【0063】

The power control method of the TFCI field for the downlink shared channel of the present invention may be characterized in that the presence or absence of the power offset is indicated by the radio interface parameter update flag of the control frame of the user plane.

【0064】

In the power control method of the TFCI field for the downlink shared channel of the present invention, the power offset (TFCIPO, TFCIPO_primary) set depending on whether the base station sending the downlink shared channel is the main base station is used as the control message of the control plane. It may be characterized by being added.

【0065】

The power control method of the TFCI field for the downlink shared channel of the present invention is based on the ratio of the number of base stations sending the TFCI2 to the total number of base stations when the TFCI2 is transmitted from a plurality of base stations in the active set. It may be characterized in that the power is controlled based on the power offsets assigned so as to be different.

【0066】

In the power control method of the TFCI field for the downlink shared channel of the present invention, the power offset (TFCIPO_primary, TFCIPO_non_primary) set depending on whether the base station sending TFCI2 is the main base station is added to the control frame of the user plane. May be a feature.

【0067】

The power control method of the TFCI field for the downlink shared channel of the present invention may be characterized in that the presence or absence of the power offset is indicated by the radio interface parameter update flag of the control frame of the user plane. ..

【0068】

The power control method of the TFCI field for the downlink shared channel of the present invention is down in the method of controlling the power of the TFCI field for the downlink shared channel when the dedicated channel associated with the mobile communication system is in the soft handover situation. Power so that it differs depending on the stage of determining whether the base station sending the link shared channel is the main base station and whether the base station sending the downlink shared channel is the main base station and whether the SSDT mode operates. It is characterized by including the stage of performing control.

【0069】

According to one desirable embodiment of the present invention for achieving the above object, a first base station sends data to a plurality of mobile stations through one communication channel and of the communication channel through at least one control channel. In a mobile communication system that sends control information, one of the plurality of mobile stations communicates with a second base station, and the second base station data to a plurality of mobile stations through its own downlink shared channel. In the case of a base station that sends control information for its own downlink shared channel through a control channel, the second base station sends control information for the downlink shared channel of the first base station to the mobile station. A way to send is provided.

【0070】

According to the method, the control information is transmitted by the first base station to the second base station, and the control information is transmitted to the first control station and the second base station that control the first base station. It can be carried out with a second control station that controls the station. Here, the first control station can send control information by using a control frame on the user plane or a control message on the control plane.

【0071】

According to another desirable embodiment of the present invention, a movement in which a first base station sends data to a plurality of mobile stations through one communication channel and sends control information of the communication channel through at least one control channel. In the communication system, any one of the plurality of mobile stations communicates with the second base station, and the second base station transmits the control information of the downlink shared channel of the first base station to the mobile station. When not transmitting, a method of increasing the transmission power of the channel including the control information transmitted by the first base station is provided.

【0072】

According to the method, when the second base station is one of the active base stations to be handovered, the increase in the transmission power is the number of active base stations that do not send control information and the total number of active base stations. Can be based on the ratio with.

【0073】

According to the method, the first control station can determine whether or not the control information is transmitted and provide the control information to the first base station.

【0074】

According to the method, when the second base station is one of the active base stations to be handed over, any one of the plurality of mobile stations communicates with the third base station through the control channel. Then, when the third base station sends control information for the communication channel of the first base station to the mobile station, the transmission power of the channel including the control information sent by the third base station is about a certain amount. Can be raised and sent.

【0075】

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, desirable embodiments of the present invention will be described with reference to the accompanying drawings.

【0076】

General downlink power control can be performed by simultaneously adjusting the power of the physical control channel and the physical data channel. The powers of the physical control channels and the physical data channels are adjusted equally in intensity, and their relative ratios do not change.

【0077】

However, when a dedicated channel associated with the downlink shared channel exists in the soft handover situation, a power control method different from this is required. That is, TFCI2 is performed by different power controls to maintain the reception quality of the TFCI field containing TFCI2.

【0078】

TFCI2 is certainly transmitted at the base station to which the downlink shared channel is transmitted, but TFCI2 may be transmitted or not transmitted at the base station where the downlink shared channel is not transmitted.

【0079】

The present invention provides a TFCI power control method for downlink shared channels to perform power control according to the handover status, the number of radio links and the number of base stations sending TFCI2, and the power offset set by the method. Regarding the signaling method for sending.

【0080】

First, in the present invention, two methods can be considered in the front force control method of the TFCI field for the downlink shared channel, which is effective at the time of handover of the 3GPP system. One is a method that considers when TFCI2 is sent only at the base station to which the downlink shared channel is transmitted [Case 1], and the other is a method that considers when TFCI2 is transmitted at multiple base stations [Case 1]. Case 2].

【0081】

[Case 1] When sending TFCI2 only at the base station to which the downlink shared channel is transmitted The above method is simple because it adjusts only the power of TFCI2 transmitted from one base station without considering the configuration of the active set, but it is possible to allocate more power than necessary.

【0082】

First, the first method adjusts the power of TFCI2 depending on whether or not it is in the handover mode of the mobile station. That is, when the mobile station is in the handover mode, it transmits to a certain high power, and if not, it transmits to a lower power than when it is in the handover mode. This allows the TFCI field power offset value of the new signaling to be set in the upper hierarchy information to make the TFCI field power offset value variable.

【0083】

The second method is to allocate different powers to the TFCI field depending on the mode selected by the mobile station (UE). In FIG. 4, the power adjustment of the remaining physical control channels and physical data channels excluding the TFCI field can be performed by a conventional power control method. However, the TFCI field is subject to different power controls depending on the mode selected by the mobile station (UE).

【0084】

The mobile station (UE) operates the SSDT only on the uplink, measures the power received from each base station, and sets the base station with the highest power among the main base stations. Then, when the base station to which the downlink shared channel is transmitted is selected as the main base station, the power control of TFCI2 holds equal to the other fields of the physical control channel. If the base station to which the downlink shared channel is transmitted is not the main base station, TFCI2 with a certain power can be transmitted from the base station to the mobile station. That is, the power of TFCI2 can be expressed by the following equation.

【0085】

1) When the base station to which the downlink shared channel is transmitted is the main base station P_TFCI(k) = P (k) + PO1 + Pp <Equation 3> 2) When the base station to which the downlink shared channel is transmitted is not the main base station P_TFCI(k) = Pnp <Equation 4> Here, Pp is a parameter for sending with a higher power than the reference TFCI field power, and Pnp is constant when the base station is not the main base station and the mobile station (UE) is in the handover situation. It is a parameter for sending with the electric power of. Also, P (k) is the power of the current dedicated channel and PO1 is the power offset between the physical data channel and the TFCI field. From the above equations 3 and 4, it can be seen that the power of TFCI2 is transmitted to a larger value when it is not the main base station than when it is the main base station.

【0086】

When SSDT mode does not work, when setting the power of TFCI2, the base station that sends the downlink shared channel is always set to the non-main base station without allocating the power depending on the presence or absence of the main base station, and the constant power is set. Can be sent at.

【0087】

Same as the first method, by setting the TFCI field power offset, which is a new signaling for the main cell and the non-main cell, and changing the TFCI field power offset value, the power control of TFCI2 in such a case can be performed. It is possible.

【0088】

On the other hand, when setting the power of TFCI2, the power can be allocated as follows depending on whether it is a main base station or a non-main base station.

【0089】

If the base station sending the downlink shared channel is the main base station, the power of TFCI2 can be shown with Equation 5.

【0090】

P_TFCI(k) = P (k) + Pp <Equation 5> Also, if the base station sending the downlink shared channel is not the main base station, the power of the TFCI field for the downlink shared channel can be shown together in Equation 6.

【0091】

P_TFCI(k) = P (k) + Pnp <Equation 6> Here, Pp is the power offset when the base station that sends the downlink shared channel is the main base station, and Pnp is the power offset when the base station that sends the downlink shared channel is not the main base station. Then, when the base station that sends the downlink shared channel is not the main base station, the Pnp value can be set high and the power can be sent in consideration of the cell boundary neighborhood. Alternatively, if you set the Pnp value above the power that can be allocated in the TFCI field for the downlink shared channel, the TFCI field can be sent to the maximum power.

【0092】

The third method is when the downlink shared channel and the dedicated channel are powered by different TPC instructions. The mobile station (UE) generates a transmit power control (TPC1) instruction for a dedicated channel excluding the TFCI field and a transmit power control (TPC2) instruction for a downlink shared channel. To this end, the mobile station (UE) measures two power sources. That is, the mobile station measures the power of the dedicated channel excluding the TFCI field and the power of the downlink shared channel, respectively. First, the mobile station measures the signal-to-interference ratio (SIR) using the pilot signal of the physical control channel to generate a transmit power control command for the dedicated channel.

【0093】

On the other hand, the mobile station uses the downlink shared channel to measure the power of the downlink shared channel. When using a downlink shared channel, it is easy to measure the signal-to-interference ratio (SIR) because it is transmitted continuously with strong power, but because there are frames that are not transmitted to the downlink shared channel, signal-to-interference It is not easy to measure the ratio. However, although TFCI2 occupies only a part in one slot, it is transmitted continuously, so that the signal-to-interference ratio can be measured in all frames. Even when the mobile station cannot receive the downlink shared channel, the transmission power control command for the downlink shared channel can be generated by receiving the TFCI2 and measuring the power from the TFCI2.

【0094】

The power of the dedicated channel excluding the TFCI field can be shown together with Equation 7 below.

【0095】

P1 (k) = P1 (k-1) + P_TPC1(k) <Equation 7> The current power P1 (k) of the dedicated channel, excluding the TFCI field from Equation 7, is the previous power P1 (k-1) adjusted by TPC1._TPC1(k) may be adjusted. That is, when TPC1est (k) = 1, P_TPC1If (k) = + ΔTPC and TPC1est (k) = 0, then P_TPC1(k) =-ΔTPC. In other words, when the measured signal-to-interference ratio (SIRest) is smaller than the target signal-to-interference ratio (SIR target), the power of the dedicated channel excluding TFCI is increased by + ΔTPC. On the other hand, when the measured signal-to-interference ratio (SIRest) is larger than the target signal-to-interference ratio (SIR target), the power of the dedicated channel excluding TFCI is reduced by about + ΔTPC.

【0096】

On the other hand, the power of the downlink shared channel can be shown together with Equation 8 below.

【0097】

P2 (k) = P2 (k-1) + P_TPC2(k) <Equation 8> From Equation 8 above, the current power P2 (k) of the downlink shared channel adjusts the power PTPC2 (k) adjusted by TPC2 with the previous power P2 (k-1). That is, when TPC2est (k) = 1, P_TPC2When (k) = + ΔTPC and TPC2est (k) = 0 P_TPC2(k) =-ΔTPC. In other words, if the measured signal-to-interference ratio (SIRest) is smaller than the target signal-to-interference ratio (SIR target), the power of TFCI2 is increased by + ΔTPC. On the other hand, when the measured signal-to-interference ratio (SIRest) is larger than the target signal-to-interference ratio (SIR target), the power of TFCI2 can be reduced by about + ΔTPC.

【0098】

Therefore, the power of TFCI2 can be calculated together with the following equation 9 based on the power of the downlink shared channel.

【0099】

P_TFCI(k) = P2 (k) + PO1 <Equation 9> Here, PO1 means the power offset between the physical data channel and the TFCI field. As shown from the above equation 9, the power of the TFCI2 is calculated by adding the power offset value to the power of the downlink shared channel. Then, when allocating the power of TFCI2, the dedicated channel can be assigned the same power as the TFCI field or different.

【0100】

However, when the power of TFCI2 and TFCI1 is controlled differently, the real number part signal and the imaginary part signal of one symbol may have different powers from each other. That is, as shown in FIG. 11, such a case occurs when 2 bits are assigned as the TFCI field. However, if the entire TFCI field is adjusted to the power (P2) of the downlink shared channel, the above-mentioned problems can be solved. That is, the TFCI field included in the dedicated channel includes TFCI1 and TFCI2, and at this time, there are cases where two pieces of information are transmitted to one symbol. In such a case, the TFCI field containing two TFCI bits can be adjusted according to the transmit power control (TPC2) instruction generated for the power control of TFCI2.

【0101】

On the other hand, the power of TFCI2 can be adjusted by a separate control signal other than the transmission power control command. Signal-to-interference ratio (SIR) measurements from mobile stations or CRC (Cyclic Redundancy) Check) When the confirmation is transmitted to the base station and the power control for the downlink shared channel is established, the power control for the downlink shared channel is linked with the power control for the downlink shared channel, that is, the power control of TFCI2 is executed from the above equations 2 and 3. Can be done. Also, in the case of a base station that sends a downlink shared channel, both the first method and the second method described above can be applied both when the mobile station is in the handover or when it is not. .. That is, regardless of whether the mobile station is in a handover or not, how to allocate different powers to each other depending on the mode in which the mobile station selects TFCI2, and each TPC generated from the downlink shared channel and the dedicated channel. It can be applied to both methods of allocating different powers to each other according to instructions. Then, the power offset can be set separately depending on whether the base station that sends the downlink shared channel is the main base station or the non-main base station.

【0102】

[Case 2] When TFCI2 is transmitted by multiple base stations The power in the TFCI field can be adjusted according to the status of the base station to which TFCI2 is currently transmitted in the active set. However, in such a case, other settings are required due to the change in the active set configuration. For this reason, when the TFCI2 is transmitted from multiple base stations in the active set, each by a power offset assigned differently depending on the ratio of the number of base stations sending the TFCI field to the total number of base stations. The power in the TFCI field can be controlled. Here, the power offset allocation can be established in consideration of the diversity gain and the power control gain.

【0103】

For example, when there are 10 base stations that send TFCI1 and there are 3 base stations that send TFCI2 among the 10 base stations, the power offset is 7/10 of the conventional power. In addition, when 5 of the 10 base stations send TFCI2, a 5/10 power offset can be added to the conventional power.

【0104】

In this way, when the number of base stations sending TFCI2 increases, the power offset of TFCI2 decreases in inverse proportion to this. However, if the number of base stations sending TFCI2 decreases, the power offset of TFCI2 can be increased. The method for power control of TFCI2 has been described above. Such methods can commonly inform whether or not to use the TFCI2 power control method through the NBAP and RNSAP protocols. For this purpose, control information called the downlink shared channel TFCI power control identifier (PC Indicator) can be added to the RADIO LINK SETUP REQUEST message and the RADIO LINK RECONFIGURATIQN PREPARE message. If the downlink shared channel TFCI power control identifier is ON, it indicates that the downlink shared channel TFCI power control is operating for the wireless link that is newly set or reset, and if it is OFF, it does not operate. Shown.

【0105】

The signaling method will be described in detail below with reference to each embodiment.

【0106】

[First Example] Signaling to notify the TFCI power offset of a physical control channel or the like that sends TFCI2 when a soft handover is performed from the control station to which the base station to which the base station to which the dedicated channel sends the downlink shared channel belongs to another control station. Regarding procedures.

【0107】

The first method (Method-1a) is to carry the TFCI power offset value applied to the physical control channel that sends the TFCI2 value, etc., when the handover is performed on the associated dedicated channel. You can use a control frame in the form of a plane with new fields added. When the handover is completed by the above method and the general TFCI power offset value of R99 / R4 becomes signaling, the general TFCI power offset value can be added to the corresponding field to know.

【0108】

This method is for the first method, which uses the conventionally used wireless interface parameter update control frame in Fig. 8 with new fields for TFCI power control, and for the downlink shared channel hard split mode. There is a second way to create a new control frame for TFCI power control. At this time, in the required information, the TFCI power offset generally applied for the dedicated channel, the TFCI power offset applied to the physical control channel that sends TFCI2 at the time of soft handover of the associated dedicated channel, etc. There is. In this way, the applied power offset value is updated by the calculated and presented method when the number of links belonging to the active set changes or the number of links sending TFCI2 changes due to changes in the wireless link configuration due to handover. Can be done. When the handover is completed by the above method and the general TFCI power offset value of R99 / R4 is used, the general TFCI power offset value can be added to the corresponding field to know. Hereinafter, each method will be specifically described.

【0109】

According to the first method, FIG. 12 is a modified format of the conventional (FIG. 8) wireless interface parameter update control frame, in which the wireless interface parameter update flag field has a TFCI power offset (TFCIPO) value. Show if it is included. If the handover is completed by the first method and the general TFCI power offset value of R99 / R4 must be used, the general TFCI power offset value can be added to the corresponding field to know. ..

【0110】

According to the second method, FIG. 13 is the format of the newly generated control frame to signal the TFCI power offset value in downlink shared channel hard split mode. This new control frame can be used to signal the TFCI power offset value in downlink shared channel hard split mode.

【0111】

The field length for entering such TFCI power offset values in FIGS. 12 and 13 is 7 bits, but can be up to 8 bits. When using the 7-bit TFCI power offset in FIGS. 12 and 13, the offset can be changed by 0.25 dB, so the offset range is 0-31.75 dB.

【0112】

The wireless interface parameter update control frame format in Figure 12 is a 2-byte wireless interface parameter update flag field, a 1-byte CFN field, 1 byte TPC power offset (PO) (5 bits), DPC mode (1 bit) and spare (1 bit). It contains a 2-bit) information field and a format that includes a TFCI power offset (TFCIPO) field that occupies 7 bits or more in 1 byte, and consists of a 5-byte payload. In addition, the control frame format for DSCH TFCI power control in Figure 13 includes a 1-byte enhanced DSCH TFCI power control flag field and a TFCI power offset (TFCIPO) field that occupies at least 7 bits in 1 byte. It consists of a 2-byte payload.

【0113】

In order to compare the signaling procedure according to the method according to the first embodiment with the signaling procedure of the prior art, a soft hand of a dedicated channel associated with a downlink shared channel by moving a mobile station (UE) together with FIGS. 9a-9d. An example will be described in which over and downlink shared channel hard handover occurs.

【0114】

First, the signaling procedure when the first method is used is shown in FIGS. 14a to 14d. When radio links are added or deleted in Figures 14a to 14d to change the active set, or when the number of radio links sending TFCI2 is changed, the usage pattern of the control frame used in the user plane is (Fig. 14a). 12) can be used to inform the appropriate TFCI power offset. 14a to 14d show the procedure corresponding to each case of FIGS. 9a to 9d, in which the wireless link setup process is performed between the serving control station and the base station in FIG. 14a, and each control station is wireless in FIG. 14b. After the link setup stage, the serving control station sends the TFCI power offset (TFCIPO) value to the jurisdiction base station and the destination control station, and the destination control station sends the TFCI power offset (TFCIPO) value to the jurisdiction base station in a control frame called a radio interface parameter update message. be able to. In FIG. 14c, the serving control station sends to the jurisdiction base station and the destination control station, and the destination control station sends the radio interface parameter update message to the jurisdiction base station with the power offset control information (TFCIPO) included. In Figure 14d, the serving control station sends radio interface parameter update information and power, including power offset control information (TFCIPO), to the destination control station and the destination control station to the competent base station.

【0115】

The signaling procedure when the second method is used is shown in FIGS. 15a to 15d. Figures 15a to 15d are very similar to Figures 14a to 14d and are new control frames for TFCI power control only on behalf of the "control frame called wireless interface parameter update" used in Figures 14b to 14d. "DSCH TFCI power control" (see Fig. 13 for the form) can be used.

【0116】

On the other hand, the second method (Method-1b) is a physical control channel that sends a TFCI2 value during soft handover of a dedicated channel associated with messages used by NBAP and RNSAP for TFCI power control on the control plane. Enter additional parameters for the TFCI power offset value applied to. The signaling procedure when using the second method is shown in FIGS. 16a to 16d. As shown in Figures 16a to 16d, instead of notifying the TFCI power offset when first setting up the radio link and not after that, NBAP or RNSAP radio link reconfiguration preparation, radio, depending on the radio link status. By inserting the TFCI power offset value (TFCIPO1) applied to the physical control channel that sends the TFCI2 value at the time of soft handover of the associated dedicated channel inside the link reset completion and wireless link reset command message. is there. When the handover is completed by the second method and the general TFCI power offset value of R99 / R4 is used, the general TFCI power offset value can be added to the corresponding field to notify the corresponding field.

【0117】

[Second Example] The present invention relates to a signaling procedure that notifies the TFCI power offset of all physical control channels that send TFCI2 at the time of handover so as to be different depending on the main cell or the non-main cell according to the uplink SSDT signaling information.

【0118】

Before explaining the signaling procedure according to the second embodiment, the situations related thereto are shown in FIGS. 17a to 17e. 17a to 17e show the channel connection status between each base station and mobile station by the hard handover of the downlink shared channel or the soft handover of the associated dedicated channel when the mobile station moves to a new control station. It is a 1st example figure. That is, FIG. 17a shows the situation before the soft handover occurs of the downlink shared channel and the associated dedicated channel, and FIG. 17b shows the soft handover occurred between the control stations of the dedicated channel associated with the downlink shared channel. Figure 17c shows the situation before the hard handover of the downlink shared channel occurs, and Fig. 17c shows the situation of the hard handover occurring between the control stations of the downlink shared channel and the soft handover occurring between the control stations of the dedicated channel. A hard handover occurrence situation between the control stations of the downlink shared channel, and FIG. 17e shows a soft handover end situation of the dedicated channel associated with the downlink shared channel.

【0119】

18a and 18b are signaling procedures when the prior art is used in the situations of FIGS. 17a-17c. In Fig. 18a and Fig. 18b, even if the equipment that supports SSDT is used, the physical control channel that belongs to the main cell among the physical control channels that send the TFCI2 value at the time of soft handover of the associated dedicated channel and TFCI2 There was no signaling to assign other TFCI power offsets to physical control channels that belong to non-primary cells, such as physical control channels that send values. Since the TFCI power offset information in FIGS. 18a-18b is transmitted only when the wireless link is newly set up, it is transmitted only in the case of FIGS. 17a and 17c. Therefore, as a conventional procedure, it is not possible to set an appropriate TFCI power offset value depending on the number of mobile stations and the number of wireless links that send TFCI2.

【0120】

The first method [Method-2a] is the physical control belonging to the main cell in the physical control channel that sends the TFCI2 value at the time of soft handover of the dedicated channel associated for TFCI power control in the user plane. The TFCI power offset value applied to the channel and the TFCI power offset applied to the physical control channel belonging to the non-main cell, such as the physical control channel that sends the TFCI2 value during soft handover of the associated dedicated channel. I used a control frame in the form of adding a new field to put information about the value.

【0121】

The first method is similar to the first method of the first embodiment. However, the control information to be added is different from the first method of the first embodiment, and the situation in which such information is actually required is different. As a result, the operation of the procedure and the format of the control frame also change. The first method to use the wireless interface parameter update control frame used in Fig. 7 by adding a new field for TFCI power control, or the control for TFCI power control for the downlink shared channel hard split mode. There is a second way to create a new frame. At this time, the TFCI power offset (TFCIPO_primary) value applied to the physical control channel belonging to the main cell among the physical control channels that send the TFCI2 value at the time of soft handover of the associated dedicated channel in the required information etc. And there is a TFCI power offset (TFCIPO_non_primary) value that is applied to the physical control channel that belongs to a cell that is not the main of the physical control channels that send the TFCI2 value during soft handover of the associated dedicated channel. Such values are used in different situations according to the change of the link due to the handover. That is, if the number of links belonging to the active set changes or the number of links sending TFCI2 changes, it will be updated by the calculated and presented method. Each method will be specifically described.

【0122】

In the first method, Figure 19 shows a modified format of the conventional wireless interface parameter update control frame, in which the 3rd bit of the wireless interface parameter update flag contains the TFCIPO value in the 5th byte. , The 4th bit can indicate whether the 6th byte contains TFCIPO_primary, and the 5th bit can indicate whether the 7th byte contains TFCIPO_non_primary.

【0123】

In the second method, Figure 20 shows the newly created control frame format to inform the TFCI power offset value in downlink shared channel hard split mode. This new control frame can be used to signal the TFCI power offset value in downlink shared channel hard split mode. The control frame format in Figure 20 is 1-byte DSCH. It is applied to the physical control channel belonging to the main cell among the TFCI power control flag field, the physical control channel that sends the TFCI2 value at the time of soft handover of the dedicated channel associated with at least 7 bits in 1 byte, etc. TFCI power offset (TFCIPO_primary) field, TFCI power offset (TFCIPO_non_primary) applied to physical control channels that belong to cells that are not the main physical control channels that send TFCI2 values during soft handover of the associated dedicated channel. It can contain fields and consist of a 4-byte payload. The field length for entering such TFCI power offset values in FIGS. 19 and 20 is 7 bits, but can be up to 8 bits. When using the 7-bit TFCI power offset shown in Fig. 12, the offset can be changed by 0.25 dB, so the offset range can be from 0 to 31.75 dB.

【0124】

The signaling procedure in the situation shown in FIGS. 17a to 17e when the first method is used is shown in FIGS. 21a to 21e. In Figures 18a to 18e, regardless of the movement of the mobile station or the fluctuation of the number of wireless links that send TFCI2, the power offset with respect to TFCI always informs us by the NBAP and RNSAP messages on the control plane when setting up the wireless link for the first time. You can use the TFCI power offset. Also, only NBAP and RNSAP messages on the control plane can be used to propagate the TFCI power offset between control stations or between base stations. That is, there was no way to inform the TFCI power offset in the control frame of the user plane. However, if the radio links are added or removed in Figures 21b-21e to change the active set, or if the number of radio links sending TFCI2 is changed, the control frame used in the user plane is used (form). Can inform you of the appropriate TFCI power offset (see Figure 19).

【0125】

The signaling procedure in the situation shown in FIGS. 17a to 17e when the second method is used is shown in FIGS. 22a to 22e. It is possible to send "DSCH TFCI power control" (see Figure 20 for the form), which is a new control frame for TFCI power control only, on behalf of the control frame "Radio Interface Parameter Update" used in Figures 21a to 21e. it can.

【0126】

The second method [Method-2b] is in the physical control channel that sends the TFCI2 value at the time of soft handover of the dedicated channel associated with the message used in NBAP and RNSAP for TFCI power control on the control plane. The TFCI power offset value applied to the physical control channel belonging to the main cell in, and the physical control channel belonging to the non-main cell among the physical control channels that send the TFCI2 value during soft handover of the associated dedicated channel. Enter additional parameters for the TFCI power offset value applied to. When the handover is completed by the above method and the general TFCI power offset value of R99 / R4 is used, the general TFCI power offset value can be added to the corresponding field to notify the field.

【0127】

23a-23e are signaling procedures that adjust the TFCI power offset using a second method to assist the second embodiment in situations such as those 17a-17e. As shown in the drawing, instead of notifying the TFCI power offset when setting up the first wireless link and not after that, depending on the situation, NBAP or RNSAP wireless link reset preparation, wireless link reset complete, wireless link reset TFCI power offset (TFCIPO_primary) of the physical control channel belonging to the main cell among the physical control channels that send the TFCI2 value during soft handover of the dedicated channel associated with the setting command message, and the physical control that sends the TFCI2 value. This is a method of notifying by inserting the TFCI power offset (TFCIPO_non_primary) for the physical control channel belonging to the non-main cell in the channel. When the handover is completed by the second method and the general TFCI power offset value of R99 / R4 is used, the general TFCI power offset value can be added to the corresponding field to notify the relevant field.

【0128】

[Third Example] Signaling that notifies the TFCI power offset of the physical control channel of the cell that sends the downlink shared channel according to the uplink SSDT signaling information at the time of handover to be different depending on the main cell or the non-main cell. Regarding procedures. In Figures 18a and 18b, signaling that allocates other TFCI power offsets depending on whether the base station that sends the downlink shared channel is the main cell or not, even if equipment that supports SSDT is used. Did not exist. When conventional power control techniques are used, the TFCI power offset information in Figures 18a and 18b is transmitted only when the radio link is newly set up, so it can only be transmitted in the case of Figures 17a and 17c. it can. Therefore, as a conventional procedure, it is not possible to set an appropriate TFCI power offset value when changing from a main base station to a non-main base station according to a change in radio link conditions.

【0129】

The first method (Method-3a) is to use the downlink shared channel among the physical control channels of the cell that sends the TFCI2 value during soft handover of the dedicated channel associated for TFCI power control in the user plane. The TFCI power offset value applied when the cell to be sent is the main cell, and the cell that does not send the downlink shared channel among the physical control channels of the cell that sends the TFCI2 value during soft handover of the associated dedicated channel. And, in the form of adding a new field to enter information for the TFCI power offset value that is applied when the cell that sends the downlink shared channel is not the main cell, such as the physical control channel of the cell that sends the TFCI2 value. Use control frames. The first method is similar to the first method in the second embodiment. However, unlike the first method of the second embodiment, the control information to be added is different from the situation in which such information is actually required, so that the procedure operation and the format of the control frame can be changed. ..

【0130】

The first method to use the wireless interface parameter update control frame used in Fig. 7 by adding a new field for TFCI power control, or the control for TFCI power control for the downlink shared channel hard split mode. There is a second way to generate a new frame. At this time, the required information is applied when the cell that sends the downlink shared channel is the main cell among the physical control channels of the cell that sends the TFCI2 value during the soft handover of the associated dedicated channel. TFCI power offset (TFCIPO_primary) value and TFCI2 during soft handover of associated dedicated channel In cells that do not send downlink shared channels, such as the physical control channel of the cell that sends the value, and in cells that do not send the downlink shared channel, such as in the physical control channel of the cell that sends the TFCI2 value. There is a TFCI power offset (TFCIPO_non_primary) value that applies in some cases. Such values are used in different situations according to the change of the link due to the handover. That is, if the number of links belonging to the active set changes or the number of links sending TFCI2 changes, it can be updated by the calculated and presented method. When the handover is completed and the general TFCI power offset value is used in the third embodiment, the general TFCI power offset value can be added to the corresponding field to notify the field. Each method will be described in detail.

【0131】

In the first method, FIG. 24 is a modified format of the conventional wireless interface parameter update control frame. In this format, the 3rd bit of the wireless interface parameter update flag indicates whether the 5th byte contains the TFCIPO1 value, and the 4th bit indicates whether the 6th byte contains the TFCIPO_primary.

【0132】

According to FIG. 24, the control frame format consists of a 2-byte radio interface parameter update flag field, a 1-byte CFN information field, a 1-byte TPC power offset and DPC mode field, a minimum of 7 bits or more TFCIPO field, and a minimum. It consists of a TFCIPO_primary field with a limit of 7 bits or more and a 6-byte payload. Here, the TFCI power offset value applied to the physical control channel belonging to the non-main cell among the physical control channels that send the TFCI2 value at the time of soft handover of the associated dedicated channel is the recalled TFCIPO field value. Can be applied.

【0133】

In the second method, Figure 25 is a newly created control frame format to inform the TFCI power offset value in downlink shared channel hard split mode. This new control frame can be used to signal the TFCI power offset value in downlink shared channel hard split mode.

【0134】

According to Figure 25, the control frame format consists of a 3-byte payload, including a 1-byte DSCH TFCI power control flag field, a minimum of 7-bit TFCIPO field, and a minimum of 7-bit TFCIPO_primary field.

【0135】

The field length for entering such TFCI power offset values in FIGS. 24 and 25 is 7 bits, but can be up to 8 bits. When using the 7-bit TFCI power offset shown in Fig. 12, the offset can be changed by 0.25 dB, so the offset range can be from 0 to 31.75 dB.

【0136】

The signaling procedure in the situation shown in FIGS. 17a to 17e when the first method is used is as shown in FIGS. 26a to 26e. In Figures 18a to 18e, the power offset with respect to TFCI is always notified by the NBAP and RNSAP messages on the control plane when setting up the radio link for the first time regardless of the movement of the mobile station or the fluctuation of the number of radio links that send TFCI2. Power offsets can be used. Also, only NBAP and RNSAP messages on the control plane can be used to propagate the TFCI power offset between control stations or between base stations. That is, there was no way to inform the TFCI power offset in the control frame of the user plane. However, if the radio links are added or removed in FIGS. 26a-26e to change the active set, or if the number of radio links sending TFCI2 is changed, the control frame used in the user plane is used (form). Can inform you of the appropriate TFCI power offset (see Figure 24).

【0137】

When using the second method, the signaling procedure in the situation shown in FIGS. 17a to 17e is shown in FIGS. 27a to 27e. It is possible to send "DSCH TFCI power control" (see Figure 25 for the form), which is a new control frame for TFCI power control only, on behalf of the control frame "Radio Interface Parameter Update" used in Figures 26a to 26d. it can.

【0138】

The second method (Method-3b) is the soft handover of the dedicated channel associated with the TFCI power offset value, which is common in messages used by NBAP and RNSAP for TFCI power control of R99 / R4 on the control plane. Dedicated associated with the TFCI power offset value (or other value if the cell is main or not main) applied to the cell sending the downlink shared channel, such as the physical control channel of the cell sending TFCI2 at Additional parameters for the TFCI power offset value applied to cells that do not send downlink shared channels, such as the physical control channels of cells that send TFCI2 values during soft handover of channels, will be included.

【0139】

FIG. 28 is a signaling procedure that adjusts the TFCI power offset to support the second method in the second method in situations such as those in FIGS. 17a-17e. As shown in the drawing, instead of notifying the TFCI power offset when setting up the first wireless link and not notifying it after that, depending on the situation, NBAP or RNSAP wireless link reset preparation, wireless link reset completion, wireless link reset Down in the TFCI power offset value (TFCIPO1), which is generally applied for dedicated channels inside the configuration command message, and the physical control channel of the cell that sends the TFCI2 value during soft handover of the associated dedicated channel. The TFCI power offset value (TFCIPO_primary) applied when the cell that sends the link shared channel is the main cell, and the base station that sends the TFCI2 value but does not send the downlink shared channel during soft handover of the associated dedicated channel. Enter the TFCI power offset value (TFCIPO_non_primary) of the physical control channel sent by the base station when the cell that sends the downlink shared channel is not the main cell among the physical control channels of the cell that sends the TFCI2 value. This is a way to inform.

【0140】

On the other hand, it is also possible to send the parameters required in the first embodiment and the second embodiment at once in one frame format on the user plane (fourth embodiment). As the fourth embodiment, there is a method of inputting the parameters used in the first and second embodiments in one frame format on the user plane. The frame formats used in this case are shown in FIGS. 29 and 30. When using a frame as shown in FIG. 29, the procedure for the first method of the first method (Method-1a) of the first embodiment and the first method (Method-2a) of the second embodiment. If you want to send a wireless interface parameter update control frame, you can send it to both. Then, when using the same new frame of FIG. 30, the procedure for the second method of the first method (Method-1a) of the first embodiment and the first method (Method-2a) of the second embodiment are used. In the procedure for the second method of), when sending the control frame of DSCH TFCI power control, it can be sent to both.

【0141】

According to Figure 29, the control frame format consists of a 2-byte radio interface parameter update flag field, a 1-byte CFN information field, a 1-byte TPC power offset and DPC mode field, and a minimum of 7 bits associated with each byte. TFCI power offset (TFCIPO) field applied to physical control channels that send TFCI2 values during soft handover of dedicated dedicated channels, physical control channels that send TFCI2 values during soft handover of associated dedicated channels, etc. The TFCI power offset (TFCIPO_primary) field applied to the physical control channel belonging to the main cell in, the non-main cell in the physical control channel that sends the TFCI2 value during soft handover of the associated dedicated channel, etc. Consists of a 7-byte payload, including a TFCI power offset (TFCIPO_non_primary) field applied to the physical control channel belonging to.

【0142】

According to Figure 30, the control frame format is applied to the DSCH TFCI power control flag, the physical control channel that sends the TFCI2 value during soft handover of a dedicated channel associated with at least 7 bits in a byte, etc. TFCI power offset field (TFCIPO), TFCI power offset (TFCIPO_primary) field applied to the physical control channel belonging to the main cell, such as the physical control channel that sends the TFCI2 value during soft handover of the associated dedicated channel, A 4-byte payload containing a TFCI power offset (TFCIPO_non_primary) applied to a physical control channel that belongs to a non-primary cell, such as a physical control channel that sends a TFCI2 value during soft handover of an associated dedicated channel. Consists of. It is also possible to send the parameters required in the first and third embodiments at once in one frame format on the user plane.

【0143】

According to the sixth embodiment, it is also possible to consider a method of inputting the parameters according to the first and third embodiments in one frame format on the user plane. The frame formats used in this case are shown in FIGS. 24 and 25. When using the frame format as shown in FIG. 24, the procedure for the first method of the first method (Method-1a) of the first embodiment and the first method of the third embodiment (Method-3a). In the procedure for the first method of, when sending a radio interface parameter update control frame, it can be sent to both. Then, when using a new frame as in FIG. 25, the procedure for the second method of the first method (Method-1a) of the first embodiment and the first method (Method-3a) of the third embodiment are used. ) In the procedure for DSCH When sending a control frame for TFCI power control, it can be sent to both. At this time, TFCIPO is commonly used from the first method of the first method (Method-1a) of the first embodiment and the first method of the first method (Method-3a) of the third embodiment. Can be And the actual parameter values may be equal or otherwise different depending on the case.

【0144】

Hereinafter, other examples of the present invention will be described. In the TFCI field of the associated dedicated channel, change the power reference point of the downlink shared channel to the physical data channel, pile lot field and TPC field of the associated dedicated channel. In the above, the TFCI field is divided into the hard split mode and the logic split mode for power control, but the physical data channel field, pile lot field and TPC field of the associated dedicated channel are sorted into the hard split mode and the logic split mode. The power control method may be simple because there is no. At this time, when signaling the downlink shared channel and the TFCI, the downlink shared channel power offset and the power offset of the TFCI can be set equally without any other setting for signaling.

【0145】

On the other hand, when the TFCI field is in hard split mode, two power offsets can be signaled to each of the downlink shared channel and TFCI. In such a case, MAX (DSCHPO_primary, TFCIPO_primary) can be defined in primary_MAX_pow, and MAX (DSCHPO_non_primary, TFCIPO_non_primary) can be defined in non-primary_MAX_pow. Where MAX (DSCHPO_primary, TFCIPO_primary) is in DSCHPO_primary or TFCIPO_primary MAX (DSCHPO_non_primary, TFCIPO_non_primary) means a large value in DSCHPO_non_primary or TFCIPO_non_primary. TFCIPO_primary and TFCIPO_non_primary indicate the TFCI power offset in the main cell or non-main cell, respectively, and DSCHPO_primary and DSCHPO_non_primary indicate the power offset of the downlink shared channel in the main cell or non-main cell, respectively.

【0146】

Therefore, in the hard split mode, primary_MAX_pow and non-primary_MAX_pow are signaled by the power offset of the TFCI field. That is, both the primary_MAX_pow and non-primary_MAX_pow are included in the wireless link setup message and the wireless link reset preparation message inside the power offset field for signaling.

【0147】

[Effect of the invention]

As described above, according to the present invention, when the downlink shared channel and the associated dedicated channel are in a soft handover situation, the TFCI field for the downlink shared channel is controlled so as to be different from the dedicated channel. By doing so, the reception quality of TFCI for downlink shared channels can be improved.

【0148】

According to the present invention, by defining a message or frame format in the control plane or the user plane for transmitting information for power control to TFCI in the downlink shared channel hard split mode, and a procedure according to each. , 3GPP Asynchronous systems and terminals can perform power control for TFCI in downlink shared channel hard split mode.

【0149】

According to the present invention, when using control messages and frame forms and procedures, the TFCI power offset will be appropriate not only when the wireless link is set up for the first time, but also due to changes in the number of mobile stations and the number of wireless links that send TFCI2. You can set a value to let us know this information. Although described in detail above through desirable examples of the present invention, the content is not limited to the above examples. In addition, a person having ordinary knowledge in the above technical field can make various changes or modifications to the present invention within the scope of the above-mentioned claims.

[Simple explanation of drawings]

[Figure 1]

The structure of the wireless connection network during soft handover between base stations within the same control station.

[Figure 2]

The structure of the wireless connection network during soft handover between different control stations.

[Fig. 3]

A drawing showing the configuration of a downlink shared channel.

[Fig. 4]

A drawing showing the configuration of a dedicated channel.

[Fig. 5]

A drawing showing a UMTS radio network control plane protocol.

[Fig. 6]

A drawing showing the UMTS radio network user plane protocol.

[Fig. 7]

A drawing showing the types of control frames used in the user plane protocol for dedicated channels on the 3GPPlur / lub interface.

[Fig. 8]

Conventional wireless interface parameter update control frame format configuration diagram.

[Fig. 9a]

The first example figure which shows the channel connection state of each base station and a mobile station by the hard handover of the downlink shared channel or the soft handover of the associated dedicated channel when a mobile station moves to a new control station.

[Fig. 9b]

The first example figure which shows the channel connection state of each base station and a mobile station by the hard handover of the downlink shared channel or the soft handover of the associated dedicated channel when a mobile station moves to a new control station.

[Fig. 9c]

The first example figure which shows the channel connection state of each base station and a mobile station by the hard handover of the downlink shared channel or the soft handover of the associated dedicated channel when a mobile station moves to a new control station.

[Fig. 9d]

The first example figure which shows the channel connection state of each base station and a mobile station by the hard handover of the downlink shared channel or the soft handover of the associated dedicated channel when a mobile station moves to a new control station.

[Fig. 10a]

A flow diagram of a conventional signaling procedure when the soft handover of the linked dedicated channel and the hard handover of the downlink shared channel generated by the movement of the mobile station together with FIGS. 9a and 9b do not occur.

[Fig. 10b]

A flow diagram of a conventional signaling procedure when the soft handover of the linked dedicated channel and the hard handover of the downlink shared channel generated by the movement of the mobile station together with FIGS. 9a and 9b do not occur.

[Fig. 11]

A drawing showing the data structure of a physical data channel and a physical control channel.

[Fig. 12]

In the first embodiment according to the present invention, the modified format configuration diagram of the wireless interface parameter update control frame.

[Fig. 13]

The format block diagram of the control frame newly added for the downlink shared channel TFCI power control in the 1st Example by this invention.

[Fig. 14a]

The flow chart for demonstrating one signaling procedure method of 1st Example by this invention.

[Fig. 14b]

The flow chart for demonstrating one signaling procedure method of 1st Example by this invention.

[Fig. 14c]

The flow chart for demonstrating one signaling procedure method of 1st Example by this invention.

[Fig. 14d]

The flow chart for demonstrating one signaling procedure method of 1st Example by this invention.

[Fig. 15a]

The flow chart for demonstrating another signaling procedure method of 1st Embodiment by this invention.

[Fig. 15b]

The flow chart for demonstrating another signaling procedure method of 1st Embodiment by this invention.

[Fig. 15c]

The flow chart for demonstrating another signaling procedure method of 1st Embodiment by this invention.

[Fig. 15d]

The flow chart for demonstrating another signaling procedure method of 1st Embodiment by this invention.

[Fig. 16a]

The flow chart for demonstrating another signaling procedure method of 1st Embodiment by this invention.

[Fig. 16b]

The flow chart for demonstrating another signaling procedure method of 1st Embodiment by this invention.

[Fig. 16c]

The flow chart for demonstrating another signaling procedure method of 1st Embodiment by this invention.

[Fig. 16d]

The flow chart for demonstrating another signaling procedure method of 1st Embodiment by this invention.

[Fig. 17a]

In the present invention, a second exemplary diagram shows a soft handover of a dedicated channel associated with a downlink shared channel and a hard handover of a downlink shared channel due to the movement of a mobile station.

[Fig. 17b]

In the present invention, a second exemplary diagram shows a soft handover of a dedicated channel associated with a downlink shared channel and a hard handover of a downlink shared channel due to the movement of a mobile station.

[Fig. 17c]

In the present invention, a second exemplary diagram shows a soft handover of a dedicated channel associated with a downlink shared channel and a hard handover of a downlink shared channel due to the movement of a mobile station.

[Fig. 17d]

In the present invention, a second exemplary diagram shows a soft handover of a dedicated channel associated with a downlink shared channel and a hard handover of a downlink shared channel due to the movement of a mobile station.

[Fig. 17e]

In the present invention, a second exemplary diagram shows a soft handover of a dedicated channel associated with a downlink shared channel and a hard handover of a downlink shared channel due to the movement of a mobile station.

[Fig. 18a]

Flow diagrams showing conventional signaling procedures in the situations of Figures 9a-9d.

[Fig. 18b]

Flow diagrams showing conventional signaling procedures in the situations of Figures 9a-9d.

[Fig. 19]

In the second embodiment according to the present invention, the modified format configuration diagram of the wireless interface parameter update control frame.

[Fig. 20]

In the second embodiment according to the present invention, the format configuration diagram of the control frame newly added for the downlink shared channel TFCI power control.

[Fig. 21a]

The flow chart for demonstrating one signaling procedure method of 2nd Example by this invention.

[Fig. 21b]

The flow chart for demonstrating one signaling procedure method of 2nd Example by this invention.

[Fig. 21c]

The flow chart for demonstrating one signaling procedure method of 2nd Example by this invention.

[Fig. 21d]

The flow chart for demonstrating one signaling procedure method of 2nd Example by this invention.

[Fig. 21e]

The flow chart for demonstrating one signaling procedure method of 2nd Example by this invention.

[Fig. 22a]

The flow chart for demonstrating another signaling procedure method of 2nd Example by this invention.

[Fig. 22b]

The flow chart for demonstrating another signaling procedure method of 2nd Example by this invention.

[Fig. 22c]

The flow chart for demonstrating another signaling procedure method of 2nd Example by this invention.

[Fig. 22d]

The flow chart for demonstrating another signaling procedure method of 2nd Example by this invention.

[Fig. 22e]

The flow chart for demonstrating another signaling procedure method of 2nd Example by this invention.

[Fig. 23a]

The flow chart for demonstrating another signaling procedure method of 2nd Embodiment by this invention.

[Fig. 23b]

The flow chart for demonstrating another signaling procedure method of 2nd Embodiment by this invention.

[Fig. 23c]

The flow chart for demonstrating another signaling procedure method of 2nd Embodiment by this invention.

[Fig. 23d]

The flow chart for demonstrating another signaling procedure method of 2nd Embodiment by this invention.

[Fig. 23e]

The flow chart for demonstrating another signaling procedure method of 2nd Embodiment by this invention.

[Fig. 24]

The format block diagram of the control frame of the radio interface parameter update for 3rd Embodiment of this invention.

[Fig. 25]

In the third embodiment of the present invention, the format configuration diagram of the control frame newly added for the downlink shared channel TFCI power control.

[Fig. 26a]

The flow chart for demonstrating one signaling procedure method of 3rd Embodiment by this invention.

[Fig. 26b]

The flow chart for demonstrating one signaling procedure method of 3rd Embodiment by this invention.

[Fig. 26c]

The flow chart for demonstrating one signaling procedure method of 3rd Embodiment by this invention.

[Fig. 26d]

The flow chart for demonstrating one signaling procedure method of 3rd Embodiment by this invention.

[Fig. 26e]

The flow chart for demonstrating one signaling procedure method of 3rd Embodiment by this invention.

[Fig. 27a]

The flow chart for demonstrating another signaling procedure method of 3rd Example by this invention.

[Fig. 27b]

The flow chart for demonstrating another signaling procedure method of 3rd Example by this invention.

[Fig. 27c]

The flow chart for demonstrating another signaling procedure method of 3rd Example by this invention.

[Fig. 27d]

The flow chart for demonstrating another signaling procedure method of 3rd Example by this invention.

[Fig. 27e]

The flow chart for demonstrating another signaling procedure method of 3rd Example by this invention.

[Fig. 27e]

The flow chart for demonstrating another signaling procedure method of 3rd Example by this invention.

[Fig. 28a]

The flow chart for demonstrating another signaling procedure method of 3rd Example according to this invention.

[Fig. 28b]

The flow chart for demonstrating another signaling procedure method of 3rd Example according to this invention.

[Fig. 28c]

The flow chart for demonstrating another signaling procedure method of 3rd Example according to this invention.

[Fig. 28d]

The flow chart for demonstrating another signaling procedure method of 3rd Example according to this invention.

[Fig. 28e]

The flow chart for demonstrating another signaling procedure method of 3rd Example according to this invention.

[Fig. 29]

Deformed format configuration diagram of the wireless link interface parameter update control frame for the first and second embodiments of the present invention.

[Fig. 30]

The format block diagram of the control frame newly added for the 1st and 2nd Examples by this invention.

[Explanation of symbols]

101 core network 102 UMTS Wireless Network 104 Serving Wireless Network Serving System 106 Serving control station 108 base station 109 base station 116 base station 118 base station 110 mobile station 112 Destination Radio Network Serve System 114 Destination Control Station