WO2007112628A1 - Procédé de commande pour créer des services de multidiffusion et de diffusion dans le système de communication sans fil - Google Patents

Procédé de commande pour créer des services de multidiffusion et de diffusion dans le système de communication sans fil Download PDF

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Publication number
WO2007112628A1
WO2007112628A1 PCT/CN2006/003752 CN2006003752W WO2007112628A1 WO 2007112628 A1 WO2007112628 A1 WO 2007112628A1 CN 2006003752 W CN2006003752 W CN 2006003752W WO 2007112628 A1 WO2007112628 A1 WO 2007112628A1
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WO
WIPO (PCT)
Prior art keywords
mbs
processing unit
terminal
service
control plane
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PCT/CN2006/003752
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English (en)
Chinese (zh)
Inventor
Hong Chen
Hongmei Xu
Yunzhong Liu
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Zte Corporation
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Publication of WO2007112628A1 publication Critical patent/WO2007112628A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/189—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast in combination with wireless systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services

Definitions

  • the present invention relates to a control method for implementing a multicast and broadcast service (MBS), which is applicable to an IEEE 802.16 wireless communication system.
  • MMS multicast and broadcast service
  • MBS is an important function of a wireless communication system defined by the IEEE 802.16 protocol.
  • MBS is divided into single base station access and multiple base station access.
  • the former refers to multicast and broadcast services in one base station; the latter refers to all terminals that register to multicast and broadcast services at the network level can receive multiple
  • the encrypted base layer control data of the base station is synchronously transmitted on the downlink connection.
  • the MBS involved in this article is the multicast and broadcast service for this multi-base station access.
  • Figure 1 shows the process of receiving MBS data by a terminal in an 802.16 wireless communication system.
  • the MAC layer of the 802.16 protocol defines a connection-based service flow 4 and a strict QoS (Quality of Service) guarantee mechanism.
  • the terminal or the network side establishes an MBS service flow by initiating a DSA (Dynamic Service Add) process, and the associated QoS and the broadcast data can obtain the QoS provided by the service flow.
  • DSA Dynamic Service Add
  • MBS Server unified processing unit MBS server
  • wireless communication systems also supported multicast and broadcast services.
  • the network side supports multicast and broadcast services.
  • the existing network architecture can be used as a reference for 802.16 systems.
  • the core network part can be directly used in 802.16.
  • the system is connected to the CSN (Connective Service Network).
  • CSN Connective Service Network
  • the access network function of the previous system is different from that of the 802.16 system, so the implementation method is not applicable to the 802.16 system.
  • Prior to P] there was no complete system architecture for implementing the MBS function of the 802.16 protocol.
  • the management of traffic or connections is very important and is completely different from other networks that do not have strict QoS requirements.
  • the characteristics of unified management and unified scheduling of MBS services are different from those of unicast services.
  • the technical problem to be solved by the present invention is to provide a control method for implementing multicast and broadcast services in a wireless communication system, which can effectively utilize core network resources of other existing systems, and saves operators money.
  • the present invention provides a control method for implementing a multicast and a broadcast service in a wireless communication system, the method comprising a terminal-side initiated multicast and broadcast service MBS connection establishment process, the process comprising the following steps:
  • the terminal obtains the MBS content information, sends a dynamic service flow increase request message to the access network, and triggers the MBS signaling processing unit to send an MBS service establishment request to the MBS server control plane processing unit;
  • the MBS server control plane processing unit After the authentication and authorization and accounting server requests authorization, the MBS server control plane processing unit requests the MBS controller to increase the MBS service flow;
  • the MBS controller sends an MBS service setup response to the MBS signaling processing unit through the MBS server control plane processing unit, and the access network sends a dynamic service flow enhancement p response to the terminal, carrying the MBS group security association information associated with the MBS service.
  • the terminal returns a dynamic service flow increase acknowledgement to the access network, triggering the MBS signaling processing unit to
  • the MBS server control plane processing unit sends a connection establishment indication
  • the MBS server control plane processing unit After receiving the connection establishment indication, the MBS server control plane processing unit interacts with the multicast router to request the multicast group to enter the port;
  • step (gl) The MBS service data stream is sent from the multicast router, processed by the MBS server data plane processing unit and the MBS packet processing unit, and then sent to the terminal. Further, in step (cl), after the authorization is passed, the MBS server control plane processing unit finds that the MBS connection has been established, and then performs the following steps:
  • the access network directly returning the MBS service establishment response to the MBS signaling processing unit, and adding the terminal to the current user list; (e2) the access network sends a dynamic service flow increase response to the terminal, where the response includes the MBS service association MBS group security association information; (f2) The terminal returns a dynamic service flow increase confirmation to the access network, and receives the MBS service data by using the obtained service key. Further, if the terminal does not receive the group service key to which the MBS group security association belongs, the terminal sends a key request message while returning the dynamic service flow increase confirmation to the access network, and the access network 4 searches for the service key. Return to the terminal by a reply message.
  • step (gl) the MBS server data plane processing unit uniformly performs bandwidth scheduling on the MBS service data sent by the multicast router, and sends the bandwidth to the MBS packet processing unit, and the MBS packet processing unit group physical frame is sent to the terminal.
  • the method further includes an MBS connection release process initiated by the terminal side, where the process includes the following steps:
  • the terminal sends a dynamic service flow deletion request message to the access network, and triggers the MBS signaling processing unit to send an MBS service release request to the MBS server control plane processing unit;
  • the MBS server control plane processing unit determines the terminal. If the terminal is the last receiving user of the MBS service flow, the following steps are performed: (c3) The MBS server control plane processing unit sends the MBS service to the MBS controller. Stream delete request;
  • the MBS controller returns an MBS service flow deletion response to the MBS server control plane processing unit, the MBS server control plane processing unit returns an MBS service release response to the MBS signaling processing unit, and the access network sends a service flow deletion response message to the terminal. Stop sending the MBS service flow; (e3) The MBS server control plane processing unit performs message exchange with the multicast router to request to exit the multicast group. Further, in step (b3), if the MBS server control plane processing unit determines that the terminal that initiated the MBS service release request is not the last receiving user of the MBS service flow, the following steps are performed: (c4) the MBS server control plane processing unit The MBS signaling processing unit returns an MBS service release response, and simultaneously deletes the terminal from the current user list;
  • the access network returns a dynamic service flow deletion response message to the terminal.
  • the present invention further provides a control method for implementing a multicast and a broadcast service in a wireless communication system, where the method includes a network-side initiated multicast and broadcast service MBS connection establishment process, and the process includes the following steps:
  • the MBS controller sends an MBS service flow increase request to the MBS server control plane processing unit, triggering the MBS server control plane processing unit to send an MBS service setup request to the MBS signaling processing unit, and the access network sends the dynamic service flow increase to the terminal. Requesting, and carrying the MBS group security association information associated with the MBS service;
  • the terminal returns a dynamic service flow addition response message to the access network, and the MBS signaling processing unit sends an MBS service establishment response to the MBS server control plane processing unit; (c5) the MBS server control plane processing unit returns the MBS to the MBS controller.
  • the service flow increases the response, and the MBS server control plane processing unit performs message interaction with the multicast router, requesting the multicast group to force the incoming port;
  • step (d5) The MBS service data stream is sent from the multicast router, processed by the MBS server data plane processing unit and the MBS packet processing unit, and then sent to the terminal. Further, in step (a5), if the terminal does not receive the group service key to which the MBS group security association belongs, the terminal sends a key request message while returning the response message to the MBS signaling processing unit, and the access network The service key is returned to the terminal through a reply message. Further, in step (d5), the MBS server data plane processing unit uniformly performs bandwidth scheduling on the MBS service data sent by the multicast router, and sends the bandwidth to the MBS packet processing unit, and the MBS packet processing unit group physical frame is sent to the terminal. Further, the method further includes a MBS connection release process initiated by the network side, where the process includes the following steps:
  • the MBS controller sends an MBS service flow deletion request to the MBS server control plane processing unit, triggers the MBS server control plane processing unit to send an MBS service release request to the MBS signaling processing unit, and the access network sends a dynamic service flow deletion request to the terminal.
  • the terminal sends a service flow deletion response message to the access network, and the MBS signaling processing unit returns an MBS service release response to the MBS server control plane processing unit;
  • the MBS server control plane processing unit performs message interaction with the multicast router, requesting to exit the multicast group;
  • the MBS server control plane processing unit returns an MBS service flow deletion response to the MBS controller.
  • the broadcast/multicast service can be effectively implemented in the 802.16e wireless communication system, and the multicast and broadcast processes of other existing systems can be largely reused, and the existing other systems can be effectively utilized.
  • the core network resources save operators the overhead.
  • the method of the invention optimizes the business process under the premise of ensuring the realization of the MBS service function, and the process complexity is small, the time is short, the resources are small, and the implementation is convenient.
  • the method of the present invention effectively integrates the service flow establishment and authentication process to ensure that the illegal users cannot receive the broadcast/multicast service, thereby ensuring the interests of the operator.
  • FIG. 1 is a schematic diagram of a process of receiving MBS data by a terminal in an 802.16 wireless communication system
  • FIG. 2 is a system architecture diagram of an 802.16 wireless communication system used by the present invention
  • FIG. 3 is a flow chart of establishing an MBS connection initiated by a terminal side according to an embodiment of the present invention
  • FIG. 4 is a flowchart of establishing an MBS connection initiated by a network side according to an embodiment of the present invention
  • FIG. 5 is a flowchart of a terminal joining an existing MBS connection according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of a terminal exiting from an MBS connection according to an embodiment of the present invention
  • FIG. 1 is a schematic diagram of a process of receiving MBS data by a terminal in an 802.16 wireless communication system
  • FIG. 2 is a system architecture diagram of an 802.16 wireless communication system used by the present invention
  • FIG. 3 is a flow chart of establishing an MBS connection initiated by a terminal side according to
  • FIG. 7 is a flowchart of an MBS connection release initiated by a terminal side according to an embodiment of the present invention
  • FIG. 8 is a flow chart of MBS connection release initiated by a network side according to an embodiment of the present invention.
  • 1 shows the process in which a terminal receives an MBS: data in an 802.16 wireless communication system.
  • three adjacent base stations 101, 102, and 103 are included in one MBS area 100, two terminals 104 and 105 that receive MBS data, and an access gateway 107 that uniformly manages the MBS, and the thick line 106 is moved by the terminal 105. route.
  • the base stations 101, 102, and 103 belong to the MBS area i or 100, and the three are synchronized. Send the same MBS data.
  • Terminals 104 and 105 join the same MBS connection and receive the same multicast and broadcast data.
  • the access gateway 107 uniformly manages the MBS service flows established in the area 100, and transmits the same MAC layer MBS data packets to the three base stations.
  • the terminal 105 moves from the base station 102 coverage area to the base station 103 coverage area on the route 106, there is no need to re-establish the MBS connection, that is, no MBS connection related handover is required.
  • the terminal 105 is in the area between the base stations 102 and 103, the MBS data sent by the two base stations is simultaneously received, and the effect of diversity combining is achieved, thereby improving the reception s.
  • Figure 2 shows a system architecture diagram for implementing multicast and broadcast services in an 802.16 wireless communication system.
  • the thin solid lines in the figure represent the signaling interactions between entities, the thick solid lines represent the data transfer, and the dashed lines are the interactions outside the scope of this paper.
  • the 802.16 wireless communication system includes a terminal 200, an access service network 201, a visited connection service network 202, and a home connection service network 203.
  • the access service network 201 needs to implement the MBS function defined in the 802.16 protocol, and is quite different from the conventional wireless communication system, and therefore is our design focus.
  • the functions to be connected to the monthly network 202 and 203 are basically the same as those of the existing wireless communication system core network. Therefore, we propose to use the existing core network to implement the architecture and method of multicast and broadcast service functions.
  • the access service network 201 includes four functional entities: an MBS signaling processing unit 204, an MBS packet processing unit 205, a MBS control plane processing unit 206, and a MBS server data plane processing unit 207.
  • the MBS server control plane processing unit and the MBS signaling processing unit form a signaling plane for the access network to process the MBS service;
  • the MBS server data plane processing unit and the MBS packet processing unit form an access network to process the data plane of the MBS service.
  • the system architecture that implements the MBS function in the wireless communication system can effectively manage the MBS service flow and process the MBS data.
  • the main functions of each functional entity in the access service network are as follows:
  • the MBS server control plane processing unit completes the control plane functions of the MBS area unified processing, including MBS area configuration, service 4 authorization, MBS connection multicast CID (connection identifier, Connect Identifier) allocation, and MBS key management.
  • the MBS signaling processing unit is responsible for establishing resources related to the MBS connection.
  • the function of the MBS server data plane processing unit is the bandwidth uniform scheduling, segmentation and group MAC layer frames of the MBS connection.
  • the MBS packet processing unit is a processing result group physical layer frame of the MBS monthly server data plane processing unit.
  • the interaction modes of the functional entities of the access service network are as follows:
  • the MBS server control plane processing unit interacts with the MBS signaling processing unit and the connected monthly service network to complete service authorization and key distribution.
  • the MBS server control plane processing unit allocates the MBS connection multicast CID and sends it to the MBS signaling processing unit.
  • the MBS server data plane processing unit sends the result of the unified processing to the MBS packet processing unit.
  • the system architecture for implementing the MBS function in the wireless communication system provided by the invention can effectively complete the management of the MBS service flow, including the service authorization, the allocation of the MBS connection multicast CID, etc.; at the same time, the MBS data processing can be effectively completed, including the MBS. Scheduling, framing, processing of MAC PDUs, etc.
  • the visited connection service network 202 includes four functional entities: a multicast and broadcast service controller 208, a multicast and broadcast service content server 209, a multicast router 210, and a visited AAA (authentication, authorization, and accounting, Authentication, Authorization). And Accounting ) 212.
  • Multicast and Broadcast Business Content Provider 21 1 may be an operator or a third party vendor.
  • the home connection service network 203 includes: a home AAA server 213 and a user attribute database.
  • the access network architecture implementing the MBS function in the wireless communication system separates the control plane and the data plane processing, thereby facilitating the reliability transmission of the control plane and the real-time transmission of the data plane.
  • the access network architecture implementing the MBS function in the wireless communication system will be proposed by the 802.16 protocol.
  • the MBS server is divided into two different functional entities according to the control plane and the data plane function, which is beneficial to the decomposition and concrete implementation of the business process.
  • the invention provides a control method conforming to the system architecture based on the system architecture, and the MBS service can be effectively implemented in the 802.16 wireless communication system.
  • the control method includes the following processes: an MBS connection establishment process initiated by the terminal side; Process 2: MBS connection establishment process initiated by the network side; Process 3: Terminal force. Enter an existing MBS connection; Process 4: The terminal exits from the MBS connection; Process 5: The MBS connection release process initiated by the terminal side; Process 6: The MBS connection release process initiated by the network side. As shown in FIG.
  • the MBS connection establishment process initiated by the terminal side includes the following steps: Step 301: The terminal obtains MBS content information, and sends a dynamic service flow increase request message (DSA-REQ) to the access network to request to establish an MBS service.
  • Step 303: The MBS signaling processing unit located in the access network sends an MBS service establishment request to the MBS server control plane processing unit;
  • MBS Controller MBS controller
  • Step 307 The MBS controller returns an MBS service flow increase response;
  • Step 308 The MBS server control plane processing unit returns an MBS service establishment response to the MBS signaling processing unit;
  • Step 309 Access network to the terminal Sending a dynamic service flow increase response (DSA-RSP), the response includes the MBS group security association information (MBS GSA) associated with the MBS service;
  • Step 310 The terminal returns a dynamic service flow increase confirmation (DSA-ACK) to the access network, If the terminal has previously obtained the group service key (MBS GTEK) to which the MBS group security association belongs, step 311 is performed, otherwise ⁇ Step 312;
  • Step 311 The access network receives the dynamic service flow increase confirmation (DSA-ACK) After MBS signaling
  • the processing unit sends a connection establishment indication to the MBS server control plane processing unit, and the MBS server control plane processing unit performs step t 314 again;
  • Step 312 If the terminal does not have the group service key to which the MBS group security association associated with the
  • Step 314 After receiving the connection establishment indication, the MBS server control plane processing unit performs message interaction with the multicast router, and the request is more The broadcast group joins; Step 315: The MBS service data stream is sent from the multicast router to the MBS server data plane processing unit; Step 3: The MBS server data plane processing unit uniformly performs bandwidth scheduling on the MBS service data, and sends the bandwidth to the MBS package. Processing unit: Step 317: The MBS packet processing unit group physical frame is sent to the terminal. As shown in FIG. 4, the MBS connection establishment process initiated by the network side includes the following steps: Step 401: The MBS controller sends an MBS service flow enhancement port request to the MBS server control plane processing unit.
  • Step 402 The MBS server control plane processing unit sends an MBS service establishment request to the MBS signaling processing unit.
  • Step 403 The network sends a dynamic service flow increase request message (DSA-REQ) to the terminal, and requests to establish an MBS service, where the message includes MBS group security association information (MBS GSA) associated with the MBS service;
  • Step 404 The terminal returns dynamic information to the access network.
  • the traffic flow increase response message (DSA-RSP) if the terminal has received the group service key (MBS GTEK) to which the MBS group security association belongs, step 405 is performed, otherwise step 406 is performed;
  • Step 405 The MBS signaling processing unit sends an MBS service establishment response to the MBS server control plane processing unit, and then performs step 408.
  • Step 406 If the terminal does not have the group service key (MBS GTEK) to which the MBS group security association associated with the MBS service belongs. After receiving the dynamic service flow increase response (DSA-RSP) to the access network, the terminal sends a key request message (PKM-REQ) to request the MBS related service key (MBS GTEK); Step 407: The network accesses the service key to the terminal through the response message (PKM-RSP), and then proceeds to step 405; Step 408: After receiving the MBS service establishment response of the MBS signaling processing unit, the MBS server control plane processing unit controls the MBS.
  • MBS GTEK group service key
  • DSA-RSP dynamic service flow increase response
  • PLM-REQ key request message
  • MBS GTEK MBS related service key
  • Step 409 At the same time as step 408, the MBS server control plane processing unit performs message interaction with the multiple routers, requesting multiple groups to join;
  • Step 410 MBS service data flow Sending from the multicast router to the MBS server data plane processing unit;
  • Step 411 The MBS server data plane processing unit uniformly performs bandwidth scheduling on the MBS service data, and sends the bandwidth to the MBS package.
  • the terminal joins a dedicated MBS connection, including the following steps: Step 501: The terminal sends a dynamic service flow to the access network.
  • Step 502 The access network returns a Receive Confirmation message (DSX-RVD);
  • Step 503 The MBS signaling processing unit in the access network controls the surface processing unit to the MBS server Sending an MBS service establishment request;
  • Step 504 The MBS server control plane processing unit requests authorization from the AAA server;
  • Step 505 The AAA server returns a 4 authorized response to the MBS server control plane processing unit.
  • Step 506 The MBS server control plane processing unit finds that the MBS connection is established, and directly returns an MBS service establishment response to the MBS signaling processing unit, and the The terminal is added to the current user list.
  • Step 507 The access network sends a dynamic service flow increase response (DSA-RSP) to the terminal, where the response includes MBS group security association information (MBS GSA) associated with the MBS service;
  • Step 508 Terminal Returning a dynamic service flow increase confirmation (DSA-ACK) to the access network, if the terminal has previously received the group service key (MBS GTEK) to which the MBS group security association belongs, step 511 is performed, otherwise, step 509 is performed;
  • Step 509 If the terminal does not have the group service key (MBS GTEK ) to which the MBS group security association associated with the MBS service belongs, the terminal sends a key request while returning a dynamic service flow increase acknowledgement (DSA-ACK) to the access network.
  • DSA dynamic service flow increase response
  • Step 510 The access network returns the service key to the terminal by using a response message (PKM-RSP); Step 51 1 : End The MBS service data is successfully received by using the obtained service key.
  • the terminal exiting the MBS connection process includes the following steps: Step 601: The terminal sends a dynamic service flow deletion request message (DSD-REQ) to the access network, requesting The MBS service processing unit in the access network sends an MBS service release request to the MBS server control plane processing unit.
  • Step 603 The MBS server control plane processing unit finds that the terminal is not the MBS service flow.
  • the access network returns a dynamic service flow deletion response message (DSD-RSP) to the terminal.
  • DSD-RSP dynamic service flow deletion response message
  • the MBS connection release process initiated by the terminal side includes the following steps: Step 701: The terminal sends a dynamic service flow deletion request message (DSD-REQ) to the access network, requesting to release the MBS service. Step 702: The access network returns a receiving acknowledgement message (DSX-RVD) to the terminal.
  • Step 703 Accessing the access
  • the MBS signaling processing unit in the network sends an MBS service release request to the MBS server control plane processing unit;
  • Step 704 The MBS server control plane processing unit finds that the terminal is the last receiving user of the MBS service flow (if not the last user) Using the foregoing terminal to exit the MBS connection process), sending an MBS service flow deletion request to the MBS controller (MBS Controller);
  • Step 705 The MBS controller returns an MBS service flow deletion response to the MBS server control plane processing unit;
  • Step 706 MBS server control
  • the surface processing unit returns an MBS service release response to the MBS signaling processing unit.
  • Step 707 The access network sends a service flow deletion response message (DSD-RSP) to the terminal to stop the sending of the MBS service flow.
  • Step 708 MBS server control plane The processing unit interacts with the multicast router to request to exit the multi-plug group; as shown in FIG.
  • the connection release process includes the following steps: Step 801: The MBS controller sends an MBS service 3 ⁇ 4 L deletion request to the MBS server control plane processing unit; Step 802: The MBS server control plane processing unit sends the MBS service to the MBS signaling processing unit And releasing the request; Step 803: The access network sends a dynamic service flow deletion request message (DSD-REQ) to the terminal, requesting to release the MBS service; Step 804: The terminal sends a service flow deletion response message (DSD-RSP) to the access network; 805: MBS signaling processing unit returns MBS to MBS server control plane processing unit Service release response; Step 806: The MBS server control plane processing unit performs message interaction with the multiple routers to request to exit the multi-plug group; Step 807: The MBS server control plane processing unit returns the MBS service flow to the MBS controller.
  • DSD-REQ dynamic service flow deletion request message
  • DSD-RSP service flow deletion response message
  • the broadcast/multicast service can be effectively implemented in the 802.16e wireless communication system, and the connection connection service can be realized to a large extent with the multicast and broadcast processes of other existing systems.
  • the multiplex of the network and the home connection service network can effectively utilize the visited network to connect to the service network and the core network resources of the service network at the home address, thereby saving the operator.
  • the control method of "terminal exits from M0S connection” under the premise of ensuring the realization of the MBS service function, the business process is well optimized, the process complexity is small, the time is short, the resources are small, and the implementation is convenient.
  • the provided control method effectively integrates the business flow establishment and authentication authorization process to ensure that illegal users cannot receive wide Broadcast/multicast services guarantee the interests of operators.”

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Abstract

L'invention concerne un procédé de commande permettant de créer des services de multidiffusion et de diffusion dans le système de communication sans fil, qui consiste en ce que: (a) l'unité de commande MBS envoie la demande d'accroissement du flux de services MBS à l'unité de traitement plane de commande du serveur MBS, déclenche ladite unité de traitement pour envoyer une demande d'établissement de services MBS à l'unité de traitement de signalisation MBS, le réseau d'accès envoyant au terminal une demande d'accroissement de flux de service dynamique; (b) le terminal renvoie au réseau d'accès un message de réponse d'accroissement de flux de service dynamique, l'unité de traitement de signalisation MBS envoyant la réponse d'établissement de services MBS à l'unité de traitement plane de commande du serveur MBS; (c) ladite unité de traitement plane de commande du serveur MBS renvoie à l'unité de commande MBS une réponse d'accroissement de flux de services MBS et, parallèlement, elle interagit avec le routeur de multidiffusion par message demandant au groupe de multidiffusion de se joindre; (d) le flux de données de services MBS est envoyé du routeur de multidiffusion au terminal. Le procédé selon l'invention peut exploiter de manière efficace les ressources de réseau principal d'autres systèmes existants, ce qui épargne au fournisseur des dépenses.
PCT/CN2006/003752 2006-04-04 2006-12-30 Procédé de commande pour créer des services de multidiffusion et de diffusion dans le système de communication sans fil WO2007112628A1 (fr)

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