WO2007100084A1

WO2007100084A1 - Packet communication system and packet communication method

Info

Publication number: WO2007100084A1
Application number: PCT/JP2007/054019
Authority: WO
Inventors: Akito Fukui; Takahisa Aoyama
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2006-03-03
Filing date: 2007-03-02
Publication date: 2007-09-07

Abstract

A packet communication system and method capable of reducing the delay of a medium caused by MBMS notification. By the system and method, a multicast judging section (114) of a PoC AS (110) judges whether or not multicast communication is used on the basis of the number of terminals called in each called domain determined in an INVITE message. If multicast communication is used, an IMS processing section (111) includes a PoC multicast flag representing that the service is a PoC service using multicast in an INVITE message and sends it to the called terminal. On receiving the INVITE message, an MBMS processing section (155) of the called terminal recognizes that a PoC service using multicast communication is provided and starts to receive the MCCH information, MSCH information and MTCH information without performing MBMS notification.

Description

Specification

Packet communication system and packet communication method

Technical field

The present invention relates to a packet communication system and a packet communication method that perform multicast packet communication.

Background art

[0002] In the field of mobile communication !, in recent years, technical studies have been conducted on Multimedia Broadcast / Multicast Service (hereinafter referred to as “MBMS”). . MBMS is one-to-many communication rather than one-to-one communication, and one base station device transmits the same data (for example, music data, video image data, etc.) simultaneously to multiple communication terminal devices. To do.

[0003] Advantages of MBMS include the following. In other words, when each communication terminal device receives information transmitted from the base station device by using a single channel for streaming 'service, etc., the number of communication terminal devices that want to receive the information increases. The load on the line will increase. However, when MBMS is used, even if the number of communication terminal devices increases, all of those communication terminal devices receive information using the same channel, so communication that can receive information without increasing the load imposed on the wireless line The number of terminal devices can be increased. Currently, services using MBMS are considered such as traffic information distribution, music distribution, station-use distribution, and sports broadcast distribution.

FIG. 1 is a configuration diagram of a packet communication system 10 that provides MBMS. The MBMS packet communication system 10 includes a content provider 11, BM—SC (Broadcast / Multicast Service Center) 12, GGSN13, SGSN14, base station control station equipment (hereinafter referred to as “RNC”) 15, and base station equipment (hereinafter referred to as “RNC”). , ΓΝοάθ Β) 16 and communication terminal equipment (hereinafter referred to as “UE”) 17.

In addition, the GGSN 13 and SGSN 14 constitute a core network (hereinafter referred to as “CN”) 18, and the RNC 15 and Node B 16 constitute a radio access network (hereinafter referred to as “RAN”) 19. It is made.

[0006] The content provider 11 is a content provider, and provides content provided by MBMS to the BM-SC 12 as MBMS data.

[0007] The BM-SC 12 instructs the GGSN 13 and forwards MBMS data provided from the content provider 11 to the GGSN 13.

[0008] The GGSN 13 sets a bearer plane for transferring MBMS data to and from the SGSN 14 according to the instructions of the BM-SC12.

[0009] The SGSN 14 performs MBMS control for each user (for example, MBMS Multicast Service Activation, MBMS Session Start Request, MBMS Registration, MBMS Session Stop) and transfers MBMS data to the RNC 15.

[0010] RNC15 was transferred from SGSN14 to transfer MBMS data efficiently.

Duplicate MBMS data and transfer the duplicated MBMS data to each Node B16

[0011] The Node B 16 wirelessly transmits the MBMS data transferred from the RNC 15 to the UE 17 using the common channel of the wireless interface. The public network is used for data transfer between RNC 15 and Node B 16.

[0012] UE 17 performs MBMS bearer service control and receives MBMS data wirelessly transmitted from Node B 16.

[0013] Thus, the content provided by the content provider 11 is transmitted to the plurality of UEs 17 under the Node B 16 as MBMS data all at once.

[0014] For a packet communication system that provides such MBMS, when providing PoC (Push-to-talk Cellular) service, a server (PoC AS) for content provider power PoC is provided. In order for the destination terminal to receive the voice transmitted from the calling terminal, the RAN needs to call the destination terminal using paging (“Notification” in MBMS). This detail is disclosed in Non-Patent Document 1!

Non-Patent Document 1: 3GPP TR23.979 V.6.2.0, 3GPP enablers for Open Mobile Alliance (O MA) Push-to-talk over Cellular (PoC) services; Stage 2

Disclosure of the invention Problems to be solved by the invention

[0015] However, the MBMS Notification cycle is based on the paging call cycle, and is, for example, a 5-second cycle, which increases the delay of voice (media). On the other hand, if the MBMS Notification cycle is shortened, the called terminal frequently checks the MBMS Notification, which increases the battery consumption of the terminal and shortens the standby time.

[0016] The present invention has been made in view of the strong point, and an object thereof is to provide a packet communication system and a packet communication method for reducing media delay caused by MBMS Notification.

Means for solving the problem

[0017] The packet communication system of the present invention, when providing a PoC service using multicast communication, notifies the receiving side wireless communication terminal device of the provision of the PoC service by signaling, and the signaling And a wireless communication terminal device that recognizes that the PoC service is provided and starts to receive setting information necessary for multicast communication.

[0018] In the packet communication method of the present invention, when the server device provides the PoC service using multicast communication, the step of notifying the receiving side wireless communication terminal device by signaling that the PoC service is provided; A step of recognizing that the wireless communication terminal apparatus is provided with the PoC service by the signaling and starting reception of setting information necessary for multicast communication.

The invention's effect

According to the present invention, media delay caused by MBMS Notification can be reduced.

Brief Description of Drawings

[0020] [FIG. 1] Configuration diagram of a packet communication system providing MBMS

2 is a block diagram showing a configuration of a packet communication system according to Embodiment 1 of the present invention. FIG. 3 is a sequence diagram showing a communication procedure of the packet communication system shown in FIG. [FIG. 4] A diagram showing the timing of MCCH information broadcasted to a RAN power terminal

FIG. 5 is a sequence diagram showing a communication procedure of the packet communication system according to the second embodiment of the present invention.

FIG. 6 is a sequence diagram showing a communication procedure of the packet communication system according to the third embodiment of the present invention.

FIG. 7 is a sequence diagram showing a communication procedure of the packet communication system according to the fourth embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0022] (Embodiment 1)

FIG. 2 is a block diagram showing a configuration of packet communication system 100 according to Embodiment 1 of the present invention. First, PoC AS110 will be described. An IMS (IP Multi-media Sub-system) processing unit 111 performs IMS processing such as an INVITE message specified in Non-Patent Document 1!

[0023] A TBCP (Talk Burst Control Protocol) processing unit 112 performs processing such as Talk Burst confirm and Receiving talk burst defined in the OMA PoC User Plane.

[0024] Talk Burst processing section 113 receives Talk Burst from calling terminal 160 and distributes it to called terminal 150.

[0025] The multicast determination unit 114 determines whether or not to use multicast communication when providing the PoC service, and notifies the IMS processing unit 111 and the TBCP processing unit 112 of the determination results.

[0026] The BM-SC 120 includes an MBMS processing unit 121. The MBMS processing unit 121 transfers Talk Burst to the IMSZPS 130 and performs processing such as Session Start for starting multicast communication.

The IMSZPS (destination side) 130 includes an IMS processing unit 131, an MBMS processing unit 132, and a packet transfer processing unit 133. The IMSZPS (calling side) 135 includes an IMS processing unit 136 and a packet transfer processing unit 137. IMS processing units 131 and 136 perform IMS processing such as INVITE messages specified in 3GPP IMS, and MBMS processing unit 132 performs 3GPP Sends Session Start for MBMS described in MBMS, replicates and distributes data. The packet transfer processing units 133 and 137 transfer the received packet.

The RAN (destination side) 140 includes an MBMS processing unit 141, an RRC processing unit 142, and a wireless transmission unit 143. The RAN (originating side) 145 includes a wireless transmission unit 146. The MBMS processing unit 141 generates and transmits Notification, MCCH (MBMS point-to-multipoint Control Channel) / MSCH (MBMS point-to-multipoint Scheduling Channel) information and data for MBMS described in 3GPP MBMS. Duplicate and distribute. The RRC processing unit 142 performs radio resource control with the terminal 150. The wireless transmission units 143 and 146 perform wireless transmission processing of signals transmitted to and received from the terminal.

The destination terminal 150 includes a radio transmission unit 151, an IMS processing unit 152, a TBCP processing unit 153, an RRC processing unit 154, an MBMS processing unit 155, and a Talk Burst processing unit 156. The calling terminal 160 includes a wireless transmission unit 161, an IMS processing unit 162, a TBCP processing unit 163, and a Talk Burst processing unit 164. The radio transmission units 151 and 161 perform radio transmission processing of signals transmitted and received with the RAN. The IMS processing units 152 and 162 perform IMS processing such as the INVITE message specified in Non-Patent Document 1. The TBCP processing units 153 and 163 perform processing such as Talk Burst confirm and Receiving talk burst specified in the OMA PoC User Plane. The RRC processing unit 154 performs radio resource control with the RNC. The MBMS processing unit 155 is described in 3GPP MBMS, performs notification for MBMS, generation and transmission of MCCH / MSCH information, and replicates and distributes data. Talk Burst processing units 156 and 164 perform Talk Burst processing.

Next, the communication procedure of the packet communication system 100 described above will be described with reference to FIG. In FIG. 3, in ST201, the originating terminal 160, which is a PoC user, turns on the power, in ST202, the originating terminal 160, the RAN145 and the IMSZPS135 perform PS Attach processing, in ST203, the establishment of the PDP context, in ST204 And IMS registration.

[0031] In ST205, the receiving terminal 150, which is a PoC user, turns on the power, and in ST 206, the receiving terminal 150 and RAN140 and IMSZPS130 and the power PS Attach process, and in ST207, the PDP con text is established. Then, each IMS registration.

[0032] In ST209, the originating terminal 160 power PoC session is started, and in ST210, the originating terminal 160 I The MS processing unit 162 sends an INVITE message including the address of one or more called terminals 150 to the IMSZPS135, and in ST211 the IMSZPS135 forwards the INVITE message sent from the calling terminal 160 to the IMS processing illill of the PoC AS110. . The INVITE message transferred to the IMS processing unit 111 of the PoC AS 110 is output to the multicast judgment unit 114.

[0033] In ST212, the multicast decision unit of PoC AS110 114 is set in the NVITE message! /, And based on the number of called terminals for each incoming domain! The IMS processor 111 is notified of the determination result. When using multicast communication, the IMS processing unit 111 sets the service contents of multicast communication, service announcement information such as an IP multicast address, and a PoC Multicast flag indicating PoC service using multicast. In ST213, the INVITE message is included in the INVITE message and transmitted to the IMS processing unit 152 of the called terminal 150 via the IMS processing unit 131 of the IMSZPS 130.

[0034] In ST214, whether or not the PoC Multicast flag indicating that the PoC service uses multicast is set in the INVITE message received by the IMS processing unit 152 of the called terminal 150 is set. Notify MBMS processor 155 of PoC Multicast flag

In ST 215, an MBMS Service Activation procedure for using multicast communication is performed between MBMS processing section 155 of called terminal 150 and MBMS processing section 132 of IMSZPS 130. In this procedure, IP multicast address, APN (Access Point Name), NSA PI (Network Service Access Point Identifier), MBMb Bearer capability ^ TMGI (Temporary Multicast Group Identifier), etc. are notified to MBMS processing unit 155 of destination terminal 150. It is.

[0036] In ST216, MMS FN (MBMS notification Indicator Channel—FN) information element indicating the start timing of the Modulation Period in the MBMS System Information of the MBMS processing unit 141 of the RAN 140, and the Modification Period Length information indicating the period of the Modification Period. The information element and the Repetition Period Length information element indicating the period of the Repetition Period are also notified to the MBMS processing unit 155 of the destination terminal 150. FIG. 4 shows the timing of MCCH information broadcast from RAN 140 to destination terminal 150. The MCCH information is changed only in the modification period unit (for example, 5 seconds), and the same information is repeatedly broadcast in the repetition period unit. The Modification Period and Repetition Period are common periods for each radio cell, and since the terminal does not need to recognize these periods for each service, it can be easily realized.

[0038] The start timing of the modification period is determined by the MI CH_FN information element in MBMS System Information, the period of the modification period by the modification period length information element, and the period of the repetition period by the repetition period length information element. To be notified to the terminal!

[0039] In Fig. 3, it is described that MBMS system info transmission (ST216) is performed after ST215, but MBMS system info is information that is continuously broadcasted, and is normally broadcasted before ST215. Has been.

[0040] In ST217, when it is confirmed that the PoC Multicast flag is set in the INVITE message received in ST213, and the PoC service using multicast communication is provided, the MBMS processing unit 155 of the called terminal 150 is provided. The receiving terminal 150 that recognizes and performs the MBMS Notification with the MBMS processing unit 141 of the RAN 140 receives the MICH_FN information element, the Modification Period Length † blueprint element, the Repetition Period Length † blueprint element, and receives the Modification Period. Start intermittent reception of MCCH information at the start timing of.

Here, the timing of intermittent reception of MCCH information need not be limited to the start timing of Modification Period, but the start timing is optimal in order to minimize the reception delay of MCCH information.

[0042] If the destination terminal 150 does not receive the MICH-FN information element or Modification Period Length information element by ST216, the MCCH information is intermittently received or always received regardless of the start timing of the Modification Period. May be performed.

[0043] In addition, the destination terminal 150 always receives MCCH information only during the Modification Period in which ST217 is started (and the specific number of Modification Periods thereafter), and in the subsequent Modulation Period, the MCCH is received at the head timing. Information may be intermittently received. This is because MC CH information is changed during the Modification Period, and repeats for 1 Modification Period or more. This is effective in the case of being sent back. For example, there may be a case of receiving MBMS service bearer info of ST233 immediately after receiving PoC multicast flag.

[0044] In ST218 to ST221, when starting PoC, IMS processing unit 152 of destination terminal 150 sends a 20 0 OK message to IMS processing unit 131 of IMSZPS130, IMS processing unit 111 of PoC AS 110, and IMS processing unit of IMSZPS135. The data is transmitted to the IMS processing unit 162 of the calling terminal 160 via 136.

[0045] In ST222 to ST225, the IMS processing unit 162 of the calling terminal 160 confirms the reception of the 200 OK message, and sends an ACK message to the IMS processing unit 136 of the IMS / PS 135, the IMS processing unit 111 of the PoC AS 110, IMS / PS. The data is transmitted to the IMS processing unit 152 of the called terminal 150 via the 130 IMS processing units 131.

[0046] In ST226, when it is confirmed that Poc AS110 IMS processing unit 111 power source terminal 160 and destination terminal 150 can start Poc, it notifies TBCP processing unit 112 of PoC AS110, and The TBCP processing unit 112 of the PoC AS 110 transmits a Talk Burst confirm message to the TBCP processing unit 163 of the calling terminal 160 and gives the right to speak.

[0047] In ST227, the TBCP processing unit 112 of the PoC AS 110 transmits a Receiving Talk Burst message to the TBCP processing unit 153 of the called terminal 150 to instruct to receive the Talk Burst.

[0048] In ST228 to ST229, since Talk burst processing unit 164 of calling terminal 160 performs multicast communication of Media (voice), Media is transmitted to BM via Talk burst processing unit 113 of PoC AS 110.

-Send to MBMS processing unit 121 of SCI 20.

[0049] In ST230 to ST231, the MBMS processing unit 121 of the BM-SC 120 transmits Session Start to the MBMS processing unit 141 of the RAN 140 via the MBMS processing unit 132 of the IMSZPS 130 in order to notify the start of multicast communication. .

[0050] In ST232, MBMS processing section 141 of RAN 140 performs MBMS counting for counting the number of service receiving terminals in each cell.

[0051] In ST233 to ST234, the MBMS processing unit 141 of the RAN 140 starts the processing of MBMS Notification, and simultaneously transmits MCCH information and MSCH information to the called terminal 150. At this time, MBMS processing section 155 of called terminal 150 has already started intermittent reception of MCCH information. Therefore, MCCH information and MSCH information are received without waiting for MBMS Notification.

[0052] In ST235, the MBMS processing unit 121 of the BM—SC 120 sends the media (voice) to the MBMS processing unit 132 of the IMS / PS 130 and the MBMS processing unit 141 of the RAN 140, and the MBMS processing unit 155 of the destination terminal 150. Deliver to. At this time, the MBMS processing unit 132 of the IMSZPS 130 and the MBMS processing unit 141 of the RAN 140 copy the Media (voice) and distribute it to a plurality of cells, if necessary. The MBMS processing unit 155 of the destination terminal 150 outputs the received Media (voice) to the talk burst processing unit 156, and the voice is played back at the destination terminal 150, for example.

[0053] Thus, according to Embodiment 1, the PoC Multicast flag indicating that the PoC AS is a PoC service using multicast is included in the INVITE message, and the destination terminal that has received this INVITE message receives the MBMS Notification. Since the reception of MCCH information, M SCH information, and MTCH information is started immediately without acquiring the MBMS Notification processing, the delay associated with this processing can be reduced.

(Embodiment 2)

Since the configuration of the packet communication system according to Embodiment 2 of the present invention is the same as the configuration shown in FIG. 2 of Embodiment 1, it will be described with the aid of FIG. 2, and redundant description will be omitted.

FIG. 5 is a sequence diagram showing a communication procedure of the packet communication system according to Embodiment 2 of the present invention. However, the parts in FIG. 5 that are the same as those in FIG. 3 are given the same reference numerals as those in FIG.

[0056] Fig. 5 shows an example of an automatic response in which IMSZPS 130 responds on behalf of the receiving terminal 150 in response to the INVITE message transmitted from the PoC AS 110, and returns 200 OK. In this example, the voice of the calling terminal 160 is transmitted to all the called terminals 150 without the terminal 150 responding. In addition, the communication procedure shown in FIG. 5 is the same as that of the first embodiment. The contention control of the request for speech and the permission for speech is continuously performed by TBCP, and INVITE is not transmitted / received for each speech. Applicable.

[0057] In FIG. 5, in ST301, the PoC AS 110 multicast decision unit 114 power SlNVITE message is set to determine whether or not the ability to use multicast communication is based on the number of called terminals for each incoming domain. And the IMS processor 111 is notified of the determination result. The IMS processing unit 111, when using multicast communication, Service Announcement information such as an IP multicast address is included in the INVITE message, and the INVITE message is transmitted to the IMS processing unit 152 of the called terminal 150 via the IMS processing unit 131 of the IMS / PS 130.

[0058] In ST302, when the TBCP processing unit 112 of the PoC AS 110 uses multicast communication, a Receiving Talk Burst message including a PoC Multicast flag indicating that the PoC service uses multicast is sent to the TBCP processing unit of the destination terminal 150. Send to 153 and instruct to receive talk burst via multicast communication.

[0059] In ST303, the MBMS processing section 141 of the RAN 140 has the MICH FN information element indicating the start timing of the Modulation Period, the Modification Period Length information element indicating the period of the Modification Period, and the period of the Repetition Period. The information including the Repetition Period Length information element shown is notified to the MBMS processing unit 155 of the called terminal 150.

[0060] In ST304, TBCP processing section 153 of terminating terminal 150 confirms whether the PoC multicast flag is set in the Receiving Talk Burst message received in ST302, and if so, it uses multicast communication. Recognize that a PoC service is provided, receive MICH_FN information element, Modification Period Length information element, Repetition Period Length information element without performing MBM S Notification, and receive MCCH information intermittently at the beginning timing of Modification Period. Start.

[0062] In ST232 to ST233, MBMS processing section 141 of RAN 140 starts processing of MBMS Notification and simultaneously starts transmission of MCCH information and MSCH information. At this time, since the MBMS processing unit 155 of the called terminal 150 has already started intermittent reception of MCCH information, it receives MCCH information and MSCH information without waiting for MBMS Notification.

[0063] As described above, according to the second embodiment, the contention control of the speech request and the speech permission is continuously performed by the TBCP in the first embodiment, and the INVITE is not transmitted / received for each speech, and from the PoC AS. When IMSZPS automatically responds to the sent INVITE message Even if the receiving terminal 150 that receives this Receiving Talk Burst message receives the MBMS Notification, the MCCH immediately receives the MCCH. By starting reception of information, MSCH information, and MTCH information, MBMS Notification processing can be reduced, so that the delay associated with this processing can be reduced.

[Embodiment 3]

Since the configuration of the packet communication system according to Embodiment 3 of the present invention is the same as the configuration shown in FIG. 2 of Embodiment 1, it will be described with the aid of FIG. 2, and redundant description will be omitted.

FIG. 6 is a sequence diagram showing a communication procedure of the packet communication system according to the third embodiment of the present invention. However, the parts in FIG. 6 that are the same as those in FIG. 3 are denoted by the same reference numerals as those in FIG.

[0066] In FIG. 6, in ST401 to ST402, the multicast judgment unit 114 of the PoC AS 110 is set to the IN VITE message, and the power to use multicast communication is determined based on the number of called terminals for each incoming domain. It judges whether or not, and notifies the IMS processing unit 111 of the judgment result. When using multicast communication, the IMS processing unit 111 includes service information of multicast communication and service announcement information such as an IP multicast address in the INVITE message, and the INVITE message is passed through the IMS processing unit 131 of the IMSZPS 130. To the IMS processing unit 152 of the destination terminal 150.

[0067] In ST403, when the TBCP processing unit 112 of the PoC AS 110 uses multicast communication, the receiving CP 150 receives a Receiving Talk Burst message including a PoC Multicast flag indicating that the PoC service uses multicast. Send to 153 and instruct to receive talk burst via multicast communication.

[0068] In ST404, TBCP processing section 153 of called terminal 150 checks whether the PoC multicast flag is set in the Receiving Talk Burst message received in ST403, and if so, it uses multicast communication. Since it recognizes that the PoC service is provided and has already started intermittent reception of MCCH information, it starts receiving MCCH information, MSCH information, and MTCH information immediately after performing MBMS Notification.

[0069] In ST404, the MBMS processing unit 141 of the RAN 140 performs each count counted in ST216. A threshold judgment is made between the number of service receiving terminals of a cell and a predetermined threshold value. If the number of service receiving terminals is equal to or less than the predetermined threshold value, an individual setting individually set with the RRC processing unit 154 of each destination terminal 150 MCCH information is reported using the control channel (DDCH). Thereby, the delay required for receiving terminal 150 to receive MCCH information can be further reduced.

[0070] However, when the number of service reception terminals of each cell counted exceeds the predetermined threshold, the MBMS processing unit 141 of the RAN 140 notifies the same MCCH information to all destination terminals 150 using the dedicated control channel. This increases the waste of radio resources, so MCCH information is reported using a common channel (FACH).

Thus, according to Embodiment 3, when the number of service receiving terminals in each cell is less than or equal to a predetermined threshold, MCCH information is notified to each destination terminal 150 using the dedicated control channel. Thus, the delay required for receiving terminal 150 to receive the MCCH information can be further reduced.

[Embodiment 4]

Since the configuration of the packet communication system according to Embodiment 4 of the present invention is the same as the configuration shown in FIG. 2 of Embodiment 1, it will be described with the aid of FIG. 2, and redundant description will be omitted.

FIG. 7 is a sequence diagram showing a communication procedure of the packet communication system according to Embodiment 4 of the present invention. However, the parts in FIG. 7 that are the same as those in FIG. 3 are given the same reference numerals as in FIG.

[0074] In ST501, MBMS processing section 141 of RAN 140 performs threshold determination between the number of service receiving terminals in each cell counted in ST216 and a predetermined threshold value. When the number of service receiving terminals is equal to or less than the predetermined threshold value, MCCH information is reported using the dedicated control channel (DDCH) that is set individually with the RRC processing unit 154 of the terminal 150.

[0075] In ST502 to ST503, MBMS processing section 141 of RAN 140 starts processing of MBMS Notification and simultaneously starts transmission of MCCH information and MSCH information. At this time, since the MBMS processing unit 155 of the called terminal 150 has already started intermittent reception of MCCH information, it receives MCCH information and MSCH information without waiting for MBMS Notification.

[0076] Furthermore, when performing a PoC service using multicast, the multicast radio bearer used in the call is considered to be the same, and the multicast carrier included in the MCCH information is considered. The wireless radio bearer setting information is received only once when communication is started, and after that, only the MTCH scheduling information is received, thereby further reducing the delay required for receiving the MCCH information.

[0077] Note that information such as Modified Service info, Common cell PtM info, Current cell PtM info, Neighboring cell PtM info, etc. can be considered as the setting information of the multicast radio bearer. Also, MBMS scheduling info can be considered as MTCH scheduling information.

In each of the above embodiments, the case where the present invention is configured by nodeware has been described as an example. However, the present invention can also be realized by software.

[0079] Further, each functional block used in the description of each of the above embodiments is typically realized as an LSI which is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include a part or all of them. Here, due to the difference in the power integration of LSI,

Sometimes called IC, system LSI, super LSI, or ultra LSI.

Further, the method of circuit integration is not limited to LSI's, and implementation using dedicated circuitry or general purpose processors is also possible. An FPGA (Field Programmable Gate Array) that can be programmed after LSI manufacturing, or a reconfigurable 'processor that can reconfigure the connection and settings of circuit cells inside the LSI may be used.

[0081] Further, if integrated circuit technology that replaces LSI emerges as a result of progress in semiconductor technology or other derived technology, it is naturally also possible to perform functional block integration using that technology. Biotechnology can be applied.

[0082] Patent application filed March 3, 2006 2006-058566 and Patent application filed October 13, 2006

The entire disclosure of the specification, drawings and abstract contained in the 2006-280230 Japanese application is incorporated herein by reference. Industrial applicability

The packet communication system and the packet communication method according to the present invention can reduce the media delay caused by MBMS Notification and can be applied to a system that provides MBMS.

Claims

The scope of the claims

[1] When a PoC service is provided using multicast communication, a server device that notifies the receiving side wireless communication terminal device that the PoC service is provided by signaling and receiving the PoC service provided by the signaling A wireless communication terminal device that recognizes and starts receiving setting information necessary for multicast communication;

A packet communication system comprising:

[2] The packet communication system according to claim 1, wherein the signaling is IMS signaling or PoC signaling.

[3] When the number of wireless communication terminal devices that receive services in a cell managed by a plurality of wireless base station devices is equal to or less than a predetermined threshold, multicast communication is performed by using an individual control channel set individually for each wireless communication terminal device 2. The packet according to claim 1, further comprising: a radio access network for notifying setting information necessary for multicast communication and notifying setting information necessary for multicast communication through a common channel when the number of wireless communication terminal devices exceeds a predetermined threshold. Communications system.

[4] When the server device provides the PoC service using multicast communication, the step of notifying the receiving side wireless communication terminal device by signaling that the PoC service is provided;

Recognizing that the wireless communication terminal apparatus is provided with the PoC service by the signaling, and starting reception of setting information necessary for multicast communication. A packet communication method comprising:

[5] Multicast determination means for determining whether or not the ability to use multicast communication is based on the number of receiving-side radio communication terminal devices;

When providing a PoC service using multicast communication, a signaling means for notifying the receiving-side wireless communication terminal device by signaling that the PoC service is provided; and

A server device comprising:

[6] The signaling means repeatedly informs setting information necessary for multicast communication. And a server device according to claim 5 for notifying change timing information of setting information necessary for multicast communication.

[7] A wireless communication terminal device comprising receiving means for receiving signaling notifying that a PoC service is provided using multicast communication and starting reception of setting information necessary for multicast communication.

8. The receiving unit according to claim 7, wherein the receiving unit receives setting information change timing information necessary for multicast communication, and intermittently receives setting information necessary for multicast communication based on the received change timing information. Wireless communication terminal device.