A method of transmitting and receiving control information for point-to-multipoint multimedia multicast service

The present invention relates to a method of transmitting and receiving control information, and more particularly to a method of transmitting and receiving control information for a one-to-polymorphic multimedia multicast service.

Figure 1 shows the network structure of UMTS (Universal Mobile Telecommunications System) using conventional technology. More specifically, the UMTS system consists of a user terminal (User Equipment: UE), a UTMS radio access network (UMTS Terrestrial Radio Access Network: UTRAN), and a core network (Core Network: CN). UTRAN is further equipped with one or more Radio Network Sub-systems (RNS), each RNS is managed by one Radio Network Controller (RNC) and this RNC. It is composed of one or more base stations NodeB. In addition, one or more cells exist in one NodeB. Hereinafter, the UE may be referred to as a mobile terminal, a mobile station, a terminal, or the like.

Figure 2 shows the structure of the wireless interface protocol between the terminal and UTRAN based on the Standardization Project (3GPP) wireless network standard for 3rd generation mobile communication systems. As shown in FIG. 2, the wireless interface protocol is horizontally composed of a physical hierarchy, a data link hierarchy, and a network hierarchy from bottom to top. Further, the interface protocol is composed of a user plane for transmitting data information and a control plane for transmitting control signals vertically from left to right. These protocol hierarchies are based on the lower three hierarchies of the Open Systems Interconnection (OSI) reference model, the first tier (L1), the second tier (L2), and the third tier (L2). It can be divided into L3).

The first layer (L1) or the physical layer uses a physical channel to provide an information transmission service to the upper layer. Structurally, the physical hierarchy is connected to the upper Medium Access Control (MAC) hierarchy via a transmission channel, and is between the media connection control hierarchy and the physical hierarchy via this transmission channel. Data is transmitted in. At the same time, data transmission between the transmitting side and the receiving side of the physical hierarchy is also performed via the physical channel.

The media connection control (MAC) layer of the second layer (L2) uses logical channels to transmit information to the upper layer or the Radio Link Control (RLC) layer. The RLC hierarchy supports the transmission of reliable data, and the RLC service data unit (SDU) sent from the upper hierarchy can be divided and / or concatenated.

The third layer (L3) Radio Resource Control (RRC) layer operates only in the control plane. The RRC controls the logical, transmit and physical channels in connection with the configuration, reconfiguration and release of the Radio Bearer (RB). Here, RB refers to a service provided from the second layer for data transmission between the terminal and UTRAN. Usually, the setting of RB means the process of defining the characteristics of the protocol hierarchy and the channel required to provide a specific service, and setting the specific parameters and operation method of each.

The Multimedia Broadcast / Multicast Service (MBMS) will be described in detail. MBMS uses the MBMS bearer service to provide streaming or background services to multiple user terminals. The MBMS service consists of one or more sessions, and MBMS data is sent through the MBMS bearer service only if the session is in progress.

FIG. 3 is a configuration diagram of the MBMS service from the user terminal side by the conventional technology. As shown in Fig. 3, UTRAN uses RB to provide MBMS bearer service to user terminals. Here, RB can be represented by two types of methods, that is, a one-to-one radio bearer and a one-to-poly radio bearer. Here, a one-to-one radio bearer is a two-way radio bearer, a logical channel (ie, Dedicated Traffic Channel: DTCH), a transmit channel (ie, Dedicated Channel: DCH), and a physical channel (ie, Dedicated Physical Channel: DTCH): It is composed of DPCH) or Secondary Common Control Physical Channel (SCCPCH). Also, the one-to-poly radio bearer is a one-way downlink radio bearer, which, as shown in Figure 3, has a logical channel (ie, MBMS Traffic Channel: MTCH) and a transmit channel (ie, Forward). It consists of an Access Channel (FACH) and a physical channel (ie, SCCPCH). The logical channel MTCH is set while each MBMS service provided in one cell is provided in the cell, and is used to provide user plane data to a plurality of terminals.

Logical Channel MBMS Control Channel (MCCH) is a one-to-polymorphic downlink channel used to transmit control information associated with MBMS. The logical channel MCCH is mapped to the downlink access channel (FACH) and the FACH is mapped to the SCCPCH. One MCCH exists in only one cell.

The conventional method described above has the following problems. In the conventional technique, when UTRAN tries to transmit a large amount of MCCH information in one change cycle, UTRAN is obliged to increase the MCCH transmission speed or easily extend the transmission cycle. However, when increasing the MCCH transmission speed, NodeB consumes more power, and at the same time, the update of MCCH information may be delayed.

<p> The present invention relates to a method for transmitting and receiving control information in a one-to-polymorphic multimedia multicast service that can substantially avoid one or more problems caused by the limitations and inconveniences of the above-mentioned conventional techniques.</p><p> An object of the present invention is to provide a method of receiving broadcast information from a network in a wireless communication system.</p><p> Another object of the present invention is to provide a method of transmitting broadcast information from a network to a mobile terminal in a wireless communication system.</p><p> Yet another object of the present invention is to provide a method for acquiring service information.</p>

<p> Further features, objectives and features of the invention will be disclosed in the specification below, which will be obvious to those with ordinary knowledge in the art of the invention, or will be learned from the practice of the invention. Another object and advantage of the present invention will be realized and obtained by the disclosed description and accompanying drawings, as well as the configurations specifically pointed out in the claims. </p><p> In order to achieve the objects and other advantages of the present invention, according to the specific and preferable features of the present invention, the method of receiving broadcast information from a network in a wireless communication system including a mobile terminal is described as described in the mobile terminal. Receives information grouped into a specific number. Further, when each message corresponds to each time interval, the mobile terminal provided in the wireless communication system receives and receives a plurality of messages based on the information grouped into the specific number. Broadcast information is acquired from multiple messages that have been sent.</p><p> Further, according to another feature of the present invention, a method of transmitting broadcast information from a network to a mobile terminal in a wireless communication system is disclosed. In this method, the network groups a plurality of pieces of information into a specific number and assigns a time interval to each specific group. In addition, the network transmits information grouped into a specific number, and when each message corresponds to each time interval, the network sends the plurality of messages.</p><p> Furthermore, according to still another feature of the present invention, a method of receiving broadcast information from a network in a wireless communication system is disclosed. In this method, the network will use the control channel if the first message contains information grouped into a specific number and the second message contains a list of elements assigned to each group. Receive multiple messages. The network then receives the next message if each next message corresponds to a time interval, and acquires broadcast information from the received next message.</p><p> Furthermore, according to still another feature of the present invention, a method of acquiring service information is disclosed. More specifically, the mobile terminal receives a plurality of messages during at least one change cycle and stores the contents of the plurality of messages. At this time, when the length of the change cycle is an integer larger than "0", the mobile terminal acquires the length of the change cycle from a plurality of stored messages, and the length of the change cycle is "0". If, the reception of multiple messages is terminated.</p>

<p> The description of the means for solving the above-mentioned problems according to the present invention and the description of the embodiments described later are examples and purposes of explanation, and are intended to provide a further description of the present invention. Should be understood.</p>

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the figure, the same components are designated by the same reference numerals as much as possible.

FIG. 4 shows an example of the MCCH information transmission method. MCCH is an example of broadcast information. More specifically, UTRAN, which provides the MBMS service, sends MCCH information to a plurality of user terminals via the MCCH channel. MCCH information is transmitted periodically according to the change cycle and the repetition cycle. Furthermore, MCCH information can be roughly divided into important information and non-important information. Therefore, the non-important information can be freely changed for transmission during all change cycles and repetition cycles. On the other hand, important information can be changed only during the change cycle. That is, the important information is repeatedly transmitted once for each repetition cycle, and the changed important information is transmitted exclusively at the start of the change cycle.

Here, the MCCH information refers to a control message related to MBMS (that is, an RRC message related to MBMS). MCCH information includes MBMS Modified Services Information (MSI), MBMS Unmodified Services Information (USI), MBMS 1-to-Multipoint RB Information, and access. Contains information and. Of these MCCH information, the access information message is classified as non-important information, while the remaining MCCH information messages are classified as important information.

When UTRAN sends all the messages contained in the MCCH information, if the message to be sent contains information about a particular service, the message to be sent contains the MBMS send identifier. Is done. Specifically, the MBMS transmission identifier is composed of an MBMS session identifier and an MBMS service identifier. If an MBMSMSI message is to be sent, the message to be sent includes the MBMS transmission identifier and the service-related information corresponding to this transmission identifier.

In addition, as shown in FIG. 3, UTRAN periodically transmits data via the MBMS notification indicator channel. Here, the data includes information for notifying whether the MCCH information is updated. If a user terminal wants to be provided with only one MBMS service, that user terminal periodically goes through MICH without receiving data via MCCH or MTCH before a particular session of the service begins. To receive data. For reference, in the description of the present application, updating MCCH information refers to the generation, addition, modification, or removal of specific items with respect to MCCH information.

UTRAN sends data via MICH and MSI messages to inform if MCCH information is updated during the change cycle. The MSI message contains identifier information for any service that is updated during the change cycle in the current cell and operational information about user terminals that subscribe to the service. At this time, the MBMS transmission identifier is used as the identifier information. Here, the MBMS transmission identifier may be composed only of the MBMS service identifier indicating a specific service, or may be a combination of an MBMS session identifier indicating a specific session of a specific service and an MBMS service identifier.

The identifier information of the service that has not been changed during the change cycle is transmitted via the USI message. At this time, the MBMS transmission identifier of the service is used as the identification information.

When a session for a particular MBMS service is activated, UTRAN sends a notification identifier (NI) via MICH. NI means instructing a user terminal wishing to receive a specific MBMS service to receive data from MCCH. While receiving data via MICH, the user terminal first receives an MSI message to know if the MBMS service it is trying to receive has changed during the change cycle. At this time, if the MBMS service has been changed, the user terminal acquires the changed MCCH information. The user terminal can receive the MSI message and the USI message sent during one change cycle and create a list of all services provided in the current cell during the change cycle.

If the user terminal attempts to receive a particular MBMS service using a one-to-poly radio bearer, the user terminal can receive MCCH information, including RB information, via the MCCH channel, 1 The received MCCH information is used to assign the polymorphic RB to the user terminal. After the user terminal configures the one-to-polymorphic RB, the user terminal can continue to receive data via the MTCH-mapped SCCPCH and receive data for a particular MBMS service sent over the MTCH. get.

UTRAN can send MBMS data discontinuously via MTCH. At this time, UTRAN periodically sends a scheduling message to the user terminal via the MBMS scheduling channel (MSCH) of SCCPCH, as shown in FIG. Here, the scheduling message informs the transmission start point and the transmission cycle of the MBMS data sent during one scheduling cycle. For this reason, UTRAN is obliged to notify the user terminal of the scheduling cycle of the scheduling information in advance.

Table 1 below shows the structure of MSI messages and USI messages in the absence of service changes according to a preferred embodiment of the invention. (table 1)

<tables num="1"><img file="JP4900973B2_D0001.tif" /></tables> In the embodiment of the present invention, the USI message can be changed at each USI cycle (UP), and the MSI message can be changed at each modification period (MP). The length of UP is S times the length of MP. According to Table 1 above, the length of UP is three times longer than the length of MP. Where S is 3. In other words, one UP contains 3 MPs. Also, the lengths of UP and MP can be expressed in time intervals. The time intervals may be the same length or different lengths.

As shown in Table 1 above, the information on unchanged services is classified into one of these three MPs and grouped. Unlike the prior art in which the USI message transmitted information about all unchanged services during 1MP, the USI message according to embodiments of the present invention contains some (or specific) of the information about the unchanged services. Send. To achieve this, all MBMS services for which a session is in progress in the cell are divided into S service groups (G1, G2, G3 groups), and each group is assigned to a different MP. Here, S of MP includes one UP.

For example, the 1st to 5th services belong to G1, the 6th to 10th services belong to G2, the 11th to 14th services belong to G3, and so on. May be grouped. Refer to Table 1 above, the 5th service from the 1st service is assigned to the MP (MP # 1) in UP # 1, and the MP (MP # 2) in UP # 1 is assigned to the 6th service. The 10th service is assigned from, and the remaining 11th to 14th services are assigned to MP (MP # 3) in UP # 1. If a particular service is assigned to a particular MP in the UP, that assignment is made for subsequent UPs as well. Such allocation is maintained until the end of the session of the service.

According to an embodiment of the present invention, UTRAN sends an MSI and USI message containing the service information of the cell to the user terminal. Before the MSI and USI messages are received, the user terminal gets the information associated with the group's S number. Therefore, the user terminal receives a plurality of messages in succession based on the S number of the group. Here, each MSI message or USI message corresponds to a time interval or is set with a different cycle length.

Table 1 above shows a scenario when there is no service information to be changed or modified in any MP. That is,<u style="single">table 1</u>There are no changes in MP # 1 to MP # 6 (ie no MSI messages), as shown in. Thus, the service information is only included in the USI, but not in the MSI message because the service has not changed. Here we indicate the information that a service (eg, 1st service, 8th service, 14th service) has been sent in an MSI message and / or a USI message during a particular MP / UP.

Table 2 below shows a scenario when there is service information to be changed in each MP except MP # 5. (Table 2)

<tables num="2"><img file="JP4900973B2_D0002.tif" /></tables> As in conventional technology, if a change in information about the service is indicated during a particular MP, the MSI message will be sent during the particular MP. That is, the MSI message contains identifier information for the modified service, regardless of the service group (G1, G2, G3) to which the service belongs. However, the USI message sent during a particular MP contains information for that service only if the information for that service is not changed to that MP and the service belongs to the service group assigned to that MP. However, USI messages sent during a particular MP do not contain modified service information, only information about unchanged services is assigned to that particular MP.

For example, referring to Table 2 above, changes in service information are indicated by the second and eighth services of MP # 1. Also, changes in service information are indicated by the second, third, and fifth services of MP # 2, and further changes in service information are indicated by the 11th and 14th services of MP # 3. Is done. In MP # 1, the information for the second service has already been assigned to MP # 1, so the modified service information associated with the second service is not included in the USI for MP # 1 and is not included in the USI for MP # 1. Included only in MSI. Also, since the information of the 8th service is assigned to MP # 2, the unchanged service information related to the 8th service is also included in the MSI of MP # 1 and of the 8th service that has not changed. Information is also included in the USI of MP # 2. Here, if the information of the 8th service is not changed again during the next cycle (that is, MP # 2), the information of the 8th service is included unchanged and assigned.

In MP # 2, changes to the information for the second service are shown in MP # 2, so the changed information for the second service is included in the MP # 2 MSI message. Even though the information for the second service was assigned to MP # 1, it is not included in the USI message for MP # 1 because the information for the second service was changed during MP # 1. The modified service information is included in the corresponding MP MSI message.

In MP # 3, the information for the 11th and 12th services has already been assigned to MP # 3, so the changed service information is included in the MSI, and the information for the remaining 12th and 13th services is not yet available. Included in USI because it is a modification.

In UP # 2, changes to the 10th service information and 12th service information are shown in MP # 4, and changes to the 8th service information and 12th service information are further MP # 2. Shown in 6. Thus, these modified service information is included in the corresponding MP MSI message. Here, the modified 10th service information is shown in MP # 4, so the modified service information is included in the MP # 4 MSI message, and at the same time, the modified 10th service. Information is also included in the already assigned MP # 5 USI messages. In addition, the modified 12th service information is included in MP # 4 and MP # 6, so this service is included in the MP's MSI. Also, the modified 12th service information is included in the MP # 6 MSI message, so it is not included in the MP # 6 USI message. After all, the information for the modified 8th service is shown in MP # 6, so the information for the modified 8th service is not only included in the MP # 6 MSI message, but also the assigned MP # Also included in the USI message of 5.

In the embodiment of the present invention, the MCCH information sent during all the change cycles transmits only the information of the service included in the MSI message and the USI message during the change cycle. For example, messages sent via MCCH (eg, MBMS1 vs. polymorphic wireless bearer information, MBMS general information, MBMS access information-MCCH information) are sent via MP # 6 MSI and USI messages8 Only the MCCH information associated with the 11th service, the 11th service, the 12th service, the 13th service and the 14th service is transmitted. In another embodiment, the MCCH information sent during each change cycle can include MCCH information related to all services in the UP to which the user terminal belongs.

Table 3 below shows an example of how that particular service information is transmitted when a session for that particular service starts or ends. (Table 3)

<tables num="3"><img file="JP4900973B2_D0003.tif" /></tables> When a session for a particular service is activated, UTRAN assigns to a particular service group. For this reason, UTRAN includes the service's identifier information in the MSI message for a particular MP. UTRAN also includes the service's identifier information in the USI message of the MP assigned to that service group. If the MP in the MSI message and the MP in the USI message are the same, the service identifier for a particular service will only be included in the MSI message for that MP.

As shown in Table 3 above, if MP # 2 signals the start of a session for the 15th service, UTRAN will include the information for the 15th service in the MP # 2 MSI message and 15 in 1UP. Send the identifier information of the information of the 15th service to the USI message of the first group assigned to the second service. At this time, since the session of the 15th service starts in MP # 2, the information of the 15th service is not included in MP # 1 but is included in the USI message starting from MP # 4.

For the 17th service session starting with MP # 2, the 17th service information is included in the MP # 2 MSI. Also, since UTRAN assigned the information for the 17th service to the second group of UP (ie MP # 2, MP # 5), the information for the 17th service is then included in the USI message for MP # 5. Is done.

For the 16th service session starting with MP # 4, the 16th service information is included in the MP # 4 MSI. Also, since UTRAN assigned the information for the 16th service to the 3rd group of UP (ie MP # 3, MP # 6), the information for the 16th service is then included in the USI message for MP # 6. Is done.

However, if MP # 2 indicates the end of the session for the third service, UTRAN will include the third service in the MP # 2 MSI message and will be assigned information about the third service in the first place. Delete the information for the third service from the first group (ie MP # 1) that is in. Therefore, after the deletion, the information of the third service will not be transmitted during the next MP. However, since the third service is assigned to the first group (ie MP # 1), the identifier information of the third service is included in the USI message in MP # 1.

Also, if MP # 3 indicates the end of the session for the 11th service, UTRAN will include the information for the 11th service in the MP # 3 MSI message and the 11th service is assigned in the first place. Delete the information for the 11th service from the 3rd group. Therefore, after the deletion, the information of the 11th service will not be transmitted any more during the next MP during the MP. For example, as shown in Table 3 above, the next MP in which the session of the 11th service ends in MP # 3, that is, MP # 6, does not include the 11th service. However, since the third service is pre-assigned to the first group, the identifier information for the third service is included in the MP # 1 USI message.

In addition, if UTRAN includes the information for the 10th service in the MP # 4 MSI message, it removes the information for the 10th service from the 2nd group to which the information for the 10th service is originally assigned. Therefore, after this, the information of the 10th service is not transmitted during MP.

In addition, if MP # 4 indicates the end of the session for the 10th service, UTRAN will include the information for the 10th service in the MP # 4 MSI message and will be assigned the information for the 10th service in the first place. Delete the information of the 10th service from the 2nd group. Therefore, after the deletion, the information of the 10th service will not be transmitted any more during the next MP.

When a group of identifier information is used in an MSI message, all available MBMS service identifiers are broadcast during the change cycle to accommodate user terminals in other cells, so all services belonging to that group are USI. Included in the message.

FIG. 5 shows a procedure for acquiring service information of a user terminal according to a preferred embodiment of the present invention. In the embodiment of the present invention, in order for the user terminal to completely acquire the service information of a specific cell, the user terminal must receive MSI messages and USI messages corresponding to the length of the USI cycle (UP). It doesn't become. When the user terminal moves to a new cell, starts the MBMS service for the first time, or when an error occurs in managing the service information, the user terminal mentioned above during UP to acquire all the service information in that cell. Receive a message. After receiving all the service information in this way, the user terminal receives only the MSI message to check the status of the service information. Here, if there is no movement or movement of the user terminal, it is not necessary to perform such an operation or procedure.

When referring to the procedure for acquiring the service information of the user terminal, UTRAN transmits the length of the USI cycle (UP) to the user terminal via BCCH or MCCH. When transmitting the length of UP via MCCH, UTRAN can use MSI or USI messages that are sent periodically to transmit the length of UP. Preferably, the UP length information is included in the USI message, and if the UP length is changed or modified, the changed UP length information should be included in the MSI message.

The details of the operation of FIG. 5 will be described below. In order to completely acquire the service information of a specific cell, the user terminal receives the information via the MCCH channel and receives the MSI message and the USI message during any change cycle. At this time, the user terminal saves the contents of the MSI message and the USI message (that is, service information). When using MSI and USI messages, the UPDML length can be obtained. Here, the length of UP is represented by S1, and the value of S1 corresponds to a multiple of the length of the change cycle. The user terminal saves the S1 value and sets m to S1 (m = S1) (S10).

The user terminal then receives the MSI message and the USI message during the next change cycle and saves the MSI message and the contents of the USI message. At this time, the user terminal acquires the length of UP by using the MSI message or the USI message. Here, the length of UP is represented by S2, and the S2 value corresponds to a multiple of the change cycle length. At this time, the user terminal sets m to m-1 (m = m-1) (S20).

After step S20, the user terminal determines whether the received S2 value is equal to the stored S1 (S30). If the S2 value is not equal to S1, the user terminal sets the S1 value replaced with the S2 value to another S1 value. The replaced S1 value is resaved and m is reset to S1. The user terminal deletes or removes all previously stored MSI and USI messages, except for recently saved MSI and USI messages (ie, the current MP's MSI and USI messages). After that, the user terminal re-executes the operation of step S20 (S40).

If the S2 value is equal to the S1 value, the user terminal currently determines whether the m value is 0. If the m value is not 0, the user terminal re-executes the operation in step S20 (S50). However, if the m value is 0, the stored MSI and USI messages contain all the service information for that cell and there is no more service information to be received in connection with that cell. It is clear (S60).

FIG. 6 is a configuration diagram of a wireless communication device that performs the operation of the present invention. This wireless communication device 100 stores a processing unit module 110 such as a microprocessor or a digital processor, an RF module 135, a power control module 106, an antenna 140, a battery 155, a display module 115, and a keypad 120. It is equipped with a module 130 (eg ROM, SRAM, flash memory), a speaker 145, and a microphone 150.

The button on the keypad 120 is used for inputting command information by pressing, and the microphone 145 is used for activating voice recognition. The processing unit module 110 can receive and process input commands to perform user-requested functions. In addition, the required data can be retrieved and used in the storage module 130 to perform the user-requested function. Further, the processing unit module 110 can display information related to the user's command and the search data from the storage module 130 on the display module 115 for the convenience of the user.

The processing unit module 110 can transmit instruction information to the RF module 135 to transmit a radio signal including voice communication data. The RF module 135 includes a transmitter and a receiver for transmitting and receiving radio signals. Here, the radio signal is finally transmitted and received using the antenna 140. If the RF module 135 can receive the radio signal, it converts the radio signal to a baseband frequency in order for the processing unit module 110 to process the radio signal. The converted signal is transmitted through the speaker 145 or is transmitted in a readable form. The RF module 135 can be used to receive data from the network or to send measurement or generated information in a wireless communication device to the network. The storage module 130 can be used to store measurement or generated information in the wireless communication device. Further, the processing unit module 110 can be suitably used for receiving data from the wireless communication device, processing the received data, or transmitting the processed data.

The wireless network and wireless communication device 100 provided with the one-to-many multimedia or multicast service has a plurality of service group controls in which control information related to the plurality of services is grouped into service groups via the RF module 135. Receive information. Further, a plurality of service group control information periodically received from the processing unit module 110 is used to acquire control information regarding the service being received by the wireless communication device 100. Further, the control information grouped in service group units can be repeatedly received via the processing unit module 110 that controls the RF module 135.

It is self-evident to those with ordinary knowledge of the invention that the invention can be embodied in other particular forms without departing from the spirit and essential features of the invention. Therefore, the detailed description described above should not be construed as restrictive in all respects and should be considered merely exemplary. The scope of the invention should be determined by a reasonable interpretation of the claims, and any modifications within the equivalent scope of the invention are within the scope of the invention.

The accompanying drawings provided to aid in a further understanding of the present invention are included as forming part of the application of the present application and describe the principles of the present invention together with embodiments and related descriptions of the present invention. Shown in. <figref num="1">The figure which shows the network structure of UMTS (Universal Mobile Telecommunications System) by the conventional technology.</figref><figref num="2">The figure which shows the structure of the wireless interface protocol between a user terminal and UTRAN based on the wireless connection network standard of the standardization project (3GPP) of the 3rd generation mobile communication system by the prior art.</figref><figref num="3">The figure which shows the structure of the MBMS service from the user terminal side for the MBMS service by the conventional technology.</figref><figref num="4">The figure which shows an example of the transmission method of MCCH information by a prior art.</figref><figref num="5">The figure which shows the procedure which acquired the service information by the user terminal according to this invention.</figref><figref num="6">The figure which shows the structure of the wireless communication device such as a mobile terminal which performs the operation of this invention.</figref>