WO2008043298A1 - Procédé et station de base pour terminal mobile dans un système de diffusion multidestination - Google Patents

Procédé et station de base pour terminal mobile dans un système de diffusion multidestination Download PDF

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Publication number
WO2008043298A1
WO2008043298A1 PCT/CN2007/070803 CN2007070803W WO2008043298A1 WO 2008043298 A1 WO2008043298 A1 WO 2008043298A1 CN 2007070803 W CN2007070803 W CN 2007070803W WO 2008043298 A1 WO2008043298 A1 WO 2008043298A1
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WIPO (PCT)
Prior art keywords
terminal
base station
multicast broadcast
broadcast service
service
Prior art date
Application number
PCT/CN2007/070803
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English (en)
French (fr)
Inventor
Wei Zhang
Jianjun Wu
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2008043298A1 publication Critical patent/WO2008043298A1/zh
Priority to US12/405,738 priority Critical patent/US20090180418A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a Multicast Broadcast Service (MBS) technology.
  • MMS Multicast Broadcast Service
  • WiMAX Worldwide Interoperability for Microwave Access
  • IEEE Institute of Electrical and Electronics Engineers
  • the WiMAX network is mainly composed of three parts, namely, a client (terminal), an Access Service Network (ASN), and a Connectivity Service Network (CSN), including a prepaid server ( Prepaid Service, referred to as "PPS”), Authentication Authorization and Accounting Server (“AAA Server”) and other logical entities.
  • ASN Access Service Network
  • CSN Connectivity Service Network
  • PPS Prepaid Service
  • AAA Server Authentication Authorization and Accounting Server
  • the ASN includes a base station (Base Station abbreviated as "BS") and an Access Service Network GateWay ("ASN GW”).
  • the WiMAX network now mainly follows the IEEE 802.16-2004 (802.16d) standard, which was established in July 2004.
  • the IEEE 802.16-2004 (802.16d) standard operating band is 2 GHz to 1 l GHz and is a licensed and unlicensed hybrid band.
  • the physical layer uses Orthogonal Frequency Division Multiplexing (OFDM) and Orthogonal Frequency Multiple Access (OFDMDMA) technology to effectively resist multipath fading. . In the case of optimal channel fading, the transmission rate can approach 75 Mbps.
  • the logical structure of the WiMAX network is shown in Figure 1.
  • the R1 interface is a wireless air interface and is mainly defined by IEEE802.16d/e. The remaining interfaces are all wired interfaces.
  • MMS Multicast & Broadcast Service
  • IP Internet Protocol
  • WiMAX defines the MBS service, which is a point-to-multipoint service that provides a data source to send data to multiple users in the mobile network, realizes network 5 resource sharing, and improves network resource utilization. , especially the air interface resources.
  • the MBS defined by WiMAX not only enables plain text low-rate message-like multicast and broadcast, but also enables multicast and broadcast of high-speed multimedia services, which undoubtedly conforms to the trend of future mobile data development.
  • a service flow identifier (“SFID") is used to identify different one-way service flows, and a connection identifier (“CID", for example) is used to identify different connections. All traffic flows are transmitted through the connection of the Medium Access Control (MAC) layer at the air interface, and the traffic is mapped to the corresponding connection through the mapping between the SFID of the service flow and the CID connected to the MAC layer.
  • MAC Medium Access Control
  • the MBS service based on the WiMAX network also specifically identifies the multicast connection through the multicast connection identifier (Multicast CID), and identifies a multicast industry through the MBS Contents ID: 5
  • a Protocol Data Unit (“PDU") transmitted on a Mulicast CID may contain one or more MBS services.
  • MBS service some globally defined service flows may carry broadcast or multicast information to multiple terminal/subscriber stations ("Serbs”), which contain QoS parameters for the purpose of improving service security. Sexually, it is sometimes encrypted with a globally defined data encryption key.
  • the MBS service based on WiMAX network supports two access modes: single base station access and multiple base station access.
  • MBS Zone identified by MBS_zone ID
  • MBS GSA MBS Group Security Association
  • the content of the same MBS service stream is sent, and the terminal that registers the MBS service can receive the MBS service data through multiple base stations in the MBS domain.
  • the terminal can receive the MBS service data through multiple base stations in the MBS domain, and is in the IDLE mode.
  • the next terminal when performing cross-base station mobility in the MBS domain, does not need to re-enter the network and re-establish the MBS service connection, and can receive the MBS service without being affected, and realize seamless handover of the MBS 0 service.
  • the 802.16e protocol does not describe the process and specific steps of the IDLE mode terminal 5 mobile MBS service in the MBS domain.
  • the IDLE mode terminal moves from the original serving base station to another base station in the same MBS domain after the session starts, the moving target base station belongs to the same paging group as the original base station, in this case, The terminal does not perform location update. If the target base station does not use the user to receive the MBS service or the number of users using the service is lower than the threshold, the point-to-multipoint (PTM) is not used: 0 mode playback In the service, the terminal in idle mode cannot get the required service.
  • PTM point-to-multipoint
  • the idle mode terminal that has joined the service moves to another base station within the same paging group in the same MBS domain before the start of the session, if the mobile target base station does not play the service because no other terminal uses the MBS service. And before the session starts, if the target base station still does not perceive the existence of the terminal, the target base station does not provide the corresponding MBS service for the terminal that moves to its range, and the terminal only: 5 can wait for the periodic location update. Or the base station initiates periodic user count statistics to obtain the required MBS monthly service.
  • embodiments of the present invention provide a method and a base station for mobile terminal movement in a multicast broadcast system, so that the idle state terminal can maintain the continuity of the multicast broadcast service while moving.
  • an embodiment of the present invention provides a method for terminal movement in a multicast broadcast system, including the steps of:
  • the target base station acquires information about the multicast broadcast service that the terminal needs to receive in the idle mode; and provides the corresponding multicast broadcast service to the terminal according to the acquired information.
  • An embodiment of the present invention further provides a base station, including:
  • An information acquiring module configured to acquire information about a multicast broadcast service that the terminal needs to receive when the terminal in the idle mode moves to the coverage of the target base station;
  • a service providing module configured to provide a multicast broadcast service to the terminal according to the information acquired by the information acquiring module.
  • the embodiment of the present invention initiates a location update procedure when the terminal in the idle mode moves between different paging groups, and the procedure notifies the target base station of the information of the MBS service that the terminal needs to receive, so that the target base station
  • the terminal can provide the corresponding MBS service according to the obtained information, so as to ensure the continuity of the MBS service when the terminal moves between different MBS domains or different paging groups, and avoid the terminal not being served for a long time after the mobile terminal is moved.
  • 1 is a logical structure diagram of a WiMAX network in the prior art
  • FIG. 2 is a flow chart showing a method of terminal movement in a multicast broadcast system according to a first embodiment of the present invention
  • FIG. 3 is a flow chart of a method for moving a terminal in a multicast broadcast system according to a second embodiment of the present invention.
  • FIG. 4 is a flow chart showing a method of terminal movement in a multicast broadcast system according to a third embodiment of the present invention.
  • FIG. 5 is a flow chart showing a method of terminal movement in a multicast broadcast system according to a fourth embodiment of the present invention.
  • FIG. 5 is a flow chart of a method for moving a terminal in a multicast broadcast system according to a fifth embodiment of the present invention.
  • FIG. 7 is a flowchart of a method for a terminal to move between different MBS domains in a multicast broadcast system according to a sixth embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a base station according to a seventh embodiment of the present invention. detailed description
  • the target base station when the terminal in the idle mode moves to the coverage of the target base station, if the preset reporting condition is met, the target base station is notified of the information of the MBS service that the terminal needs to receive, so that the target base station can be timely. Obtain the information of the MBS service of the terminal under the jurisdiction, and
  • the terminal provides the corresponding MBS service to ensure the continuity of the MBS service before and after the mobile terminal moves.
  • the first embodiment relates to a method for the terminal to move in a multicast broadcast system.
  • the method is applicable to the multicast broadcast system of the WiMAX system, that is, the MBS service in the WiMAX system in this embodiment is as shown in FIG. 2 .
  • step 201 the terminal first determines the item.
  • the terminal can monitor whether the target base station and the original base station belong to the same paging group or the same MBS domain by monitoring the information of the target base station. If the target base station and the original base station belong to the same MBS domain of the same paging group, proceed to step 202; if the target base station and the original base station do not belong to the same paging group but belong to the same MBS domain, proceed to step 211, and the terminal initiates a location update to the target base station. Process, notification by location update operation
  • the target base station determines whether the bearer of the MBS service has been established. If the target base station does not belong to the same MBS domain, the process proceeds to step 213, and the terminal needs to exit.
  • the MBS service information sent by the target base station is received, and the MBS service information stored by the terminal is updated to ensure that the terminal can continuously receive the MBS service from other MBS domains. For details, refer to the sixth embodiment of the present invention.
  • step 202 the terminal further determines whether the current MBS service session has started. If the service has started, the terminal is already receiving the MBS service. If the data goes to step 203, the process ends. Regarding the case where the terminal moves before the start of the MBS service, how to ensure that the terminal receives the MBS service in time when the service starts, refer to the third, fourth, and fifth embodiments of the present invention.
  • step 203 the terminal receives the required "MBS" in the specified frame according to the Next MBS Frame Offset indicated by the "MBS Resource Mapping Message MBS MAP" message obtained before the movement.
  • Resource mapping message MBS MAF message (the message contains the multicast connection identifier Multicast CID identifier required for receiving the service, referred to as "MCID"). If the "MBS MAP" message required by the terminal is received in the specified frame, the message is entered.
  • Step 212 continue to synchronize according to the prior art Receiving its MBS service; otherwise, proceeding to step 204.
  • step 204 the terminal acquires the message by listening to the "downlink resource mapping message DL_MAP” message. Required "MBS MAP" message, if within the scheduled time limit
  • the terminal obtains the required "MBS MAP" message, and proceeds to step 212 to continue to receive its MBS service synchronously according to the prior art; conversely, if the predetermined time limit is exceeded, the terminal has not received the corresponding "MBS MAP" message. It indicates that the target base station does not multicast the MBS service data, and proceeds to step 205.
  • step 205 the terminal notifies the target base station of the MBS service information that the terminal needs to receive, to prompt the user of the MBS service that the target base station currently needs to receive the service.
  • the terminal may extend the ranging request "RNG_REQ” message in the location update process by initiating a Location Update process, in which the MBS service information that the terminal is using is carried, and the "RNG-REQ” message is passed.
  • the MBS service information of the terminal is reported; or the location update response "Location Update Response” message returned by the anchor paging controller (Paging Controller, referred to as "PC") to the target base station during the location update process, in the response message Carrying the terminal
  • the MBS service information includes: MBS Service ID (Multicast Broadcast Service Identity), Content ID (Content Identity), Multicast CID, MGSAID (Multicast Broadcast Service Group Security Association Identity), SFID (Service Flow Identity), MBS Zone ID (Multiple Broadcast broadcast service domain identity), IP multicast
  • the target base station does not play the service, the target base station does not multicast the MBS service data required by the terminal for a variety of reasons, which may be:
  • the target base station uses the Point to Point (“PTP") mode to play the MBS service data because there are fewer users receiving the MBS service.
  • PTP Point to Point
  • step 206 after receiving the MBS service information of the terminal, the target base station determines whether the MBS service is currently carried, if the PTM mode is currently being carried and selected. (In the case that the session has started, the terminal does not need to receive data even if the terminal does not receive the data.) In this case, the process proceeds to step 212, where the terminal waits and synchronously receives the MBS service according to the prior art. If the target base station selects the MBS service in the PTP mode, the process proceeds directly to step 210; if the service is not currently carried, the process proceeds to step 5 207. Through multiple judgments, various reasons for the terminal not receiving the MBS service data are filtered out, and the processing is specifically performed according to different reasons to ensure that the terminal can successfully receive the MBS service data required by the target base station.
  • the target base station may perform statistics on the number of users currently using the MBS service in the current base station. If the MBS service is currently transmitted in the PTP mode and the current number of users exceeds the preset threshold, the MBS is used. The transmission mode of the service is converted to PTM.
  • step 207 the target base station does not carry the MBS service, and the target base station registers with the upstream gateway node, requires the MBS service to be carried, and establishes a bearer channel of the MBS service if necessary.
  • a method of registering a gateway node with a target base station and establishing a bearer channel refer to the prior art session start scheme.
  • the base station determines whether the PTM mode is currently used to provide the MBS service to the terminal according to the actual situation. If yes, the process proceeds to step 209; otherwise, if the PTP mode is selected to transmit the MBS service, the process proceeds to step 210.
  • the target base station uses the multicast CID agreed by the MBS domain and
  • MGSAID which sends the MBS service data through PTM mode.
  • the terminal only needs to continue to listen to the "DL-MAP":0 message to get the MBS service data that it needs, which effectively prevents the terminal from receiving the MBS service after moving to the target base station for a long time.
  • the target base station selects to provide the user with the PTP mode, and the target base station activates the user by using the Paging Info obtained from the location update process, and then performs PTM to PTP mode conversion on the terminal, indicating the
  • the terminal receives the MBS industry through the PTP connection: 5 service data.
  • the target base station is used to transmit the MBS service data with less network resources in the PTP mode, and does not affect the terminal that moves to its coverage to receive the MBS service, which makes up for the deficiencies in the prior art.
  • the second embodiment of the present invention mainly relates to a method for terminal mobile in a multicast broadcast system, and the method is applicable to a multicast broadcast system of a WiMAX system.
  • the MBS service in this embodiment is based on WiMAX.
  • the MBS service of the system is shown in Figure 3.
  • the target base station clearly identifies whether the current MBS service is currently played and whether the service is currently played in the PTM mode in the broadcast signaling. In this way, the terminal can easily determine the playback status of the MBS service required by the terminal, so that the terminal 5 actively cooperates with the target base station to update the next terminal information according to the actual situation, so that the target base station provides the corresponding MBS service.
  • step 301 the terminal first determines whether the target base station and the original serving base station of the terminal belong to the same paging group and belong to the same MBS domain, and the terminal can judge by monitoring the information of the target base station. Whether the target base station and the original base station belong to the same paging 0 group or the same MBS domain. If the target base station and the original base station belong to the same MBS domain of the same paging group, proceed to step 302; if the target base station and the original base station do not belong to the same paging group but belong to the same MBS domain, proceed to step 310 to perform a location update operation, and pass the location.
  • the update operation notifies the target base station of the MBS service information of the local terminal, and then proceeds to step 305.
  • the subsequent processing is the same as that in the first embodiment. If the target base station and the original base station do not belong to the same MBS domain, the process proceeds to step 312, and the terminal needs to retreat.
  • the idle mode or the initiating location update process is performed, and the MBS service information sent by the target base station is received, and the MBS service information stored by the terminal is updated to ensure that the terminal can continuously receive the MBS service from other MBS domains. For details, refer to the sixth embodiment of the present invention.
  • the terminal determines whether the current MBS service session has started. If the service has started: 0, the terminal is already receiving the MBS. If the business data is, then the process proceeds to step 303, otherwise the process ends.
  • the terminal moves before the start of the MBS service how to ensure that the terminal receives the MBS service in time when the service starts, refer to the third, fourth, and fifth embodiments of the present invention.
  • step 303 the terminal determines, according to the broadcast signaling of the target base station, whether the target base station currently plays its required MBS service through the PTM mode, and if yes, proceeds to step 311, according to the prior art: 5 receives the MBS service; If the target base station does not currently play the MBS service or plays the MBS service in the PTP mode, the process proceeds to step 304.
  • step 304 the terminal notifies the target base station of the information of the MBS service that the terminal needs to receive, to prompt the user that the target base station currently needs to add a MBS service to receive the service.
  • the terminal can initiate a location update process in the location update process. Expanding the "RNG-REQ” message, carrying the MBS service information that the terminal is using, reporting the MBS service information of the terminal through the "RNG-REQ” message, or transmitting the wrong PC to the target base station through the location update process.
  • the returned "Location Update Response" response message carries the MBS service information that the terminal is using, and notifies the base station of the MBS service of the terminal.
  • the MBS service information includes: MBS service ID, Contents ID, Multicast CID, MGSAID, SFID, MBS Zone ID, IP multicast address, and the like.
  • the target base station determines whether the MBS service is currently carried, and if the target base station selects to play the PTM mode,
  • step 309 If the MBS service is currently carried, but the target base station selects the MBS service in the PTP mode, the process proceeds directly to step 309; otherwise, if the MBS service is not currently carried, the process proceeds to step 306.
  • various reasons for the terminal not receiving the MBS service data are filtered out, and the processing is specifically performed according to different reasons to ensure that the terminal can successfully receive the MBS service data required by the target base station.
  • Steps 306 to 309 are similar to steps 207 to 210, and are not mentioned here.
  • the base station may obtain the MBS service information of the idle state terminal by using the following method: For the idle state terminal that has joined the MBS service, once it finds that it has moved to the new base station Within the coverage, the terminal initiates a location update process, and the base station obtains the information that the terminal joins the MBS service through the location update process.
  • :0 in turn, can provide the terminal with the required services.
  • the third embodiment of the present invention mainly relates to a method for terminal mobile in a multicast broadcast system, and the method is applicable to a WiMAX system.
  • the MBS service in the method is based on the MBS service of the WiMAX system, as shown in FIG. 4 .
  • the terminal in the idle mode moves to the coverage of the target base station before the start of its MBS service.
  • This embodiment is suitable for data encryption needs to be performed.
  • the MBS server performs the update of the MBS service key before the start of the MBS service session, and sends a related message by initiating the key update process to indicate the information of the MBS service that each terminal joins to the terminal on the base station to which the terminal belongs.
  • the base station can obtain the terminal information using the service within its management range before starting the MBS service, and can also confirm the location of the terminal. Avoid It is avoided that the terminal information in the coverage area that the base station knows does not conform to the actual situation, and the terminal that moves to the base station cannot receive the MBS service correctly.
  • the mobile terminal moves to the idle mode terminal within the coverage of the target base station, and after receiving the message of the key update procedure, the MBS service information is sent to the target base station.
  • the target base station determines that the terminal needs to receive the MBS service message, and determines whether the base station has registered the MBS service with the upstream gateway node, and if yes, Going directly to step 405, otherwise, proceeding to step 404, the target base station registers with the upstream gateway node and requests to carry the MBS service.
  • step 405 the target base station establishes a service bearer channel at the beginning of the MBS service session, and the target base station plays the data of the MBS service to the terminal in the selected PTP/PTM mode.
  • the specific play mode refer to the related art. .
  • the fourth embodiment of the present invention mainly relates to a method for moving a terminal in a multicast broadcast system.
  • the method is applicable to a WiMAX system.
  • the MBS service in the method is based on the MBS service of the WiMAX system, as shown in FIG. 5.
  • the terminal in the idle mode moves to the coverage of the target base station before the start of its MBS service.
  • the terminal obtains the start time of the MBS service through Service Announcement before the start of its MBS service.
  • the terminal may also actively notify the terminal by the network side one time before the session starts.
  • the process proceeds to step 502.
  • the terminal When the time when the start of the MBS service is less than the preset duration, that is, the preset update time before the start of the MBS service, the terminal initiates a location update process, and the target update process is used to notify the target.
  • the base station needs to receive the MBS service.
  • the terminal may generate a random length delay when the time from the start of the MBS service is less than the preset duration, and then initiate the delay: 5 location update Process.
  • the terminal actively cooperates with the base station to update the terminal information in the coverage area, which can effectively avoid the terminal information in the coverage area that is known by the base station from being inconsistent with the actual situation, and the terminal newly moved to the base station cannot correctly receive the MBS service. .
  • the terminal may augment the "RNG-REQ” message in the location update process, and carry the MBS service information that the terminal is using, and report the MBS service letter of the terminal through the "RNG-REQ” message.
  • the "Location Update Response" message returned by the anchor PC to the target base station during the location update process the MBS service information that the terminal is using is carried in the response message, and the base station is notified of the MBS service information of the terminal.
  • MBS Service ID includes: MBS Service ID, Contents ID, Multicast CID, MGSAID, SFID, MBS Zone ID, IP Multicast Address, etc.
  • step 503 after the target base station receives the MBS service information of the terminal, it determines whether the base station has registered the MBS service with the upstream gateway node, and if yes, proceeds directly to step 505, otherwise, proceeds to step 504, and the target base station approaches the upstream gateway.
  • the node registers and requests to carry the MBS service.
  • step 505 the target base station establishes a service bearer channel at the beginning of the MBS service session, and the target base station plays the data of the MBS service to the terminal in the selected PTP/PTM mode.
  • the specific play mode refer to the related art. .
  • the fifth embodiment of the present invention mainly relates to a method for terminal mobility in a multicast broadcast system, and the method is applicable to a WiMAX system, and the MBS service in the method is based on the MBS service of the WiMAX system.
  • the terminal in the idle mode moves to the coverage of the target base station before the MBS service starts.
  • the target base station initiates periodic user statistics regardless of whether the MBS service session starts and whether the terminal uses the MBS service within the coverage of the current base station.
  • the user information is used to update the information of the terminal in the target base station to ensure that the target base station provides the corresponding MBS service to the terminal in time.
  • step 602 the terminal that moves to the target base station reports its MBS service information to the target base station after receiving the periodically initiated user statistics message. Then, the process proceeds to step 603.
  • Steps 603 to 605 are similar to steps 503 to 505, and are not mentioned here.
  • the above schemes judge and process the phenomenon that the terminal may not be able to receive the MBS service after the terminal does not change the location update condition of the terminal.
  • a sixth embodiment of the present invention relates to a method for a terminal to move between different MBS domains, as shown in FIG. 7.
  • the target base station after the terminal moves does not belong to the same MBS domain, that is, when the terminal crosses the original MBS domain during the mobile process, in order to ensure that the terminal continues to receive the MBS service that it is receiving 5 before, the corresponding update needs to be updated.
  • step 701 the terminal notifies the target base station that the terminal exits the idle mode by using the RNG_REQ message.
  • the target base station sends an exit idle mode request to the anchor PC.
  • the anchor PC returns an idle mode exit response message to the target base station, and carries the original MBS service information of the terminal user in the response message.
  • the target base station can learn the MBS service information that the terminal is receiving or has joined before, and if the MBS domain where the current target base station is located can also carry the MBS service, the target base station according to the current MBS domain.
  • Corresponding information constructing an RNG-RSP message, and returning to the terminal the MBS service ID, Content ID, LCID, MCID, SFID, GSAID, etc. used by the MBS service in the MBS domain to which the current base station belongs;
  • the 0 bears the MBS service, and the terminal is notified by the RNG-RSP message: The base station does not provide the MBS service.
  • step 705 the service ASN where the target base station is located initiates the process of the bearer related process of the MBS service to ensure the data of the MBS service. And business information can be sent to the
  • the terminal After obtaining the content, the terminal optionally initiates a key request process, obtains a transmission key of the MBS service, and continues to use the service through the content and the transmission key of the MBS service.
  • the terminal After acquiring the service, the terminal can initiate the process of entering the idle mode again to return to the idle mode.
  • the MBS service information of the terminal may also be transmitted to the base station in the foregoing manner, and the bearer adjustment procedure of the base station is triggered.
  • the terminal does not exit the Idle mode, and informs the base station of the required MBS service through the location update procedure, and the notification manner may be extended by 5 RNG-REQ or location update response message. , will not repeat them here.
  • the base station returns the parameter corresponding to the MBS service in the MBS domain to the terminal through the RNG-RSP.
  • a seventh embodiment of the present invention relates to a base station, as shown in FIG. 8, including an information acquiring module, configured to acquire information about an MBS service that a terminal needs to receive when a terminal moves in an idle mode to a coverage of a target base station, and The base station updates the MBS service information of the terminal in the coverage area, so that the terminal does not correctly receive the MBS service because the terminal information in the coverage area is not consistent with the actual one.
  • a service providing module configured to: when the base station does not register the MBS service indicated by the information acquired by the acquiring module, register the service with the upper-level gateway node, establish a bearer channel of the service with the upper-level gateway node, and adopt a point-to-point or point-to-multipoint mode, Provide MBS services for terminals.
  • the information acquiring module may include any one of the following submodules or any combination thereof: a module for acquiring MBS service information that the terminal needs to receive from a location update process initiated by the terminal; a module for obtaining a multicast broadcast service that the terminal needs to receive in the process of exiting the idle mode initiated by the service domain; a module for obtaining the MBS service information that the terminal needs to receive from the periodic user statistics process; Obtained in the key update process initiated by the MBS server
  • the terminal initiates a location update process when the one of the following conditions is met, and the acquiring module obtains the MBS service information of the terminal by using the location update process: the target base station and the original serving base station of the terminal belong to different paging groups; the MBS service has started. And the terminal does not receive the data of the MBS service within the coverage of the target base station; the terminal determines that the target base station does not play the MBS service or in the point-to-point mode
  • the service providing module may include one of the following modules or any combination thereof: For counting, when the multicast broadcast service is registered, counting the number of users currently transmitting the multicast broadcast service using the point-to-point mode, if the multicast broadcast service is currently transmitted using the point-to-point mode and the user If the number exceeds the preset gate P ⁇ , the transmission mode of the multicast broadcast service is converted into a point-to-multipoint module;
  • the service providing module may further include: when the multicast broadcast service is provided to the terminal by using a point-to-point mode, instructing the terminal to enter an active mode, and connecting through a point-to-point connection And receiving, by the terminal, a module of the multicast broadcast service data.
  • the present invention initiates a location update procedure when the terminal in the idle mode moves between different paging groups, and the process notifies the target base station of the information of the MBS service that the terminal needs to receive, so that the target base station can
  • the obtained information provides the corresponding MBS service for the terminal, so as to ensure the continuity of the MBS service 5 when the terminal moves between different MBS domains or different paging groups, and avoids that the terminal does not get the service after moving for a long time.
  • the terminal When the terminal moves between the base stations of different MBS domains, in order to continue to receive the original MBS service content, the terminal must exit the idle mode, and the target base station can obtain the MBS service that the terminal needs to receive from the anchor PC through the process of exiting the idle mode. Information to provide corresponding MBS services.
  • the terminal in the idle mode moves from the original base station to the same paging group: when the target base station coverage is within the 0 MBS domain, if the terminal is within the coverage of the target base station, the data of the MBS service is not received. Or the terminal determines, according to the information included in the broadcast signaling of the target base station, that the target base station does not play the MBS service or plays the MBS service in the PTP mode, and notifies the target base station of the MBS service information that the terminal needs to receive through the location update procedure.
  • the target base station is configured to provide the corresponding MBS service for the terminal, thereby ensuring that the terminal can maintain the continuity of the MBS service in the MBS domain after the MBS service starts: 5, and avoid the terminal being unable to obtain the service after the mobile phone is moved for a long time.
  • the target base station initiates an update process before the service starts, and the terminal is reported to be reported through the process.
  • the terminal When the time when the MBS service to be received by the terminal is less than the preset duration, the terminal reports the MBS service that needs to be received, so that the base station can provide the service normally when the service starts, and ensure that the terminal can receive the MBS domain normally. MBS business.
  • the target base station initiates periodic user statistics. After the terminal in the idle mode moves from the original base station to the coverage of the target base station in the same MBS domain of the same paging group, the terminal reports the MBS service information that needs to be received through the user statistics process, thereby At the beginning, it is possible to provide the corresponding terminal in time.
  • the MBS service enables the terminal to move within the MBS domain without affecting the normal reception of its MBS service.
  • the target base station After receiving the MBS information of the terminal, the target base station registers the service with the higher-level gateway node, and establishes a bearer channel for the MBS service with the upper-level gateway node, and provides the terminal with the PTP or PTM mode. This service ensures the continuity of the service during the terminal movement.
  • the terminal If the target base station provides the MBS service to the terminal through the PTP mode, the terminal is instructed to enter the activation mode to establish a point-to-point connection for the terminal, so that the terminal successfully receives the MBS data.

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Description

多播广播系统中终端移动的方法和基站
本申请分别要求于 2006年 9月 27日、 2007年 2月 15日提交中国专利局、 申请号分别为 200610141725.8、 200710084531.3、 发明名称均为 "多播广播系 统中终端移动的方法和基站"的中国专利申请的优先权 , 其全部内容通过 )用 结合在本申请中。
技术领域
本发明涉及无线通信领域， 特别涉及多播广播业务（Multicast Broadcast Service, 简称" MBS" )技术。
背景技术
随着通信技术的发展和用户需求的增长，数据业务得到了迅速发展，数据 业务量的迅速增长使得人们对通信带宽的需求日益高涨，宽带接入正在向产业 界展现出一个巨大的市场。 为突破接入网的带宽瓶颈，人们推出了多种宽带接 入技术。
微波接入全球互通 ( Worldwide Interoperability for Microwave Access, 简 称" WiMAX" ),是目前业界对基于电子和电气工程师协会（ Institute of Electrical and Electronics Engineers, 简称" IEEE" ) 802.16系列标准的无线城域网接入技 术，其基本目标是提供一种在城域网一点对多点的多厂商环境下，可有效互操 作的宽带无线接入手段。 WiMAX网络主要由三个部分组成，即客户端（终端）、 接入服务网 （ Access Service Network , 简称 "ASN" ) 和连接服务网络 ( Connectivity Service Network, 简称" CSN" ), 包括预付费服务器 （Prepaid Service, 简称" PPS" )、 认证、 授权和计费服务器（ Authentication Authorization and Accounting Server, 简称" AAA Server" )等等逻辑实体。 其中， ASN包括 基站（ Base Station 简称" BS" )和接入服务网络网关（ Access Service Network GateWay, 简称" ASN GW" )。 WiMAX网络现在主要遵循的是 2004年 7月制 定的 IEEE 802.16-2004 ( 802.16d )标准。 IEEE 802.16-2004 ( 802.16d )标准工 作频段是 2GHz到 l lGHz,是授权和非授权的混合频段。其物理层采用正交频 分复用 （ Orthogonal Frequency Division Multiplexing, 简称' OFDM" )和正交频 分多址接入 ( Orthogonal Frequency Multiple Access, 简称' OFDMA" )技术， 能有效的抗多径衰落。 最佳信道衰落情况下， 其传输速率可以逼近 75Mbps。 WiMAX网络逻辑结构如图 1所示。 其中 R1接口为无线空中接口， 主要 由 IEEE802.16d/e定义。 其余接口均为有线接口。
以上对 WiMAX 网络作了简单介绍， 下面对多播广播业务（Multicast & Broadcast Service , 简称" MBS" )进行说明。
5 随着 Internet (因特网 ) 的迅猛发展， 人们对移动通信的需求已不再满足 于电话和消息业务， 大量多媒体业务涌现出来，其中一些应用业务要求多个用 户能同时接收相同数据， 如视频点播、 电视广播、视频^义、 网上教育和互动 游戏等。目前在有线网络上可以采用网间互联协议（ Internet Protocol ,简称" IP" ) 组播和广播技术来实现，但是将这些业务移植到移动网上，与一般的数据相比，
0 由于这些业务具有数据量大、持续时间长、 时延敏感等特点， 并且移动网具有 特定的网络结构、 功能实体和无线接口等， 现有 IP组播和广播技术并不能直 接适用于移动网。
为了有效地利用移动网络资源， WiMAX定义了 MBS业务， MBS业务是 在移动网络中提供一个数据源向多个用户发送数据的点到多点业务，实现网络 5 资源共享， 提高网络资源的利用率， 尤其是空口接口资源。 WiMAX定义的 MBS 不仅能实现纯文本低速率的消息类组播和广播， 而且还能实现高速多媒 体业务的组播和广播， 这无疑顺应了未来移动数据发展的趋势。
在 WiMAX网络中，通过业务流标识（ Service Flow Identifier,简称" SFID" ), 来标识不同的单向业务流， 通过连接标识（Connection ID, 简称 "CID，，）来 :0 标识不同的连接， 所有的业务流在空口通过媒体访问控制 （ Medium Access Control, 简称" MAC" )层的连接进行传送， 通过在业务流的 SFID与 MAC层 连接的 CID之间进行映射， 将业务流在对应的连接上传输。 基于 WiMAX网 络 MBS业务在上述标识的基础上， 还通过多播连接标识（Multicast CID )专 门标识组播连接， 通过组播内容标识（MBS Contents ID )来标识一个组播业 ：5 务，一个 Mulicast CID上传输的协议数据单元（ Protocol Data Unit,简称" PDU" ) 可以包含一个或多个 MBS业务。
在 MBS业务中，某些全球定义的服务流可以携带到多个终端 /下属用户站 ( Subscriber Station, 简称" SS" )的广播或多播信息， 这些服务流包含 QoS 参 数 ,为了提高业务的安全性 ,有时会用全球定义的数据加密密钥对其进行加密。 基于 WiMAX网络的 MBS业务支持两种接入模式： 单基站接入和多基站 接入。 在多基站接入模式下， 一个 MBS域（即 MBS Zone, 用 MBS— zone ID 来标识）内的所有基站用相同的 Multicast CID和 MBS组安全联盟（ MBS Group Security Association, 简称" MBS GSA" ), 发送同一 MBS业务流的内容， 注册 5 了 MBS服务的终端可以在该 MBS域内通过多个基站接收 MBS业务数据。
在现有技术中，根据协议 802.16e-2005的描述，对于多基站接入模式下的 MBS业务，终端除了可以在该 MBS域内通过多个基站接收 MBS业务数据外， 对于处于 IDLE (空闲 )模式下的终端， 在 MBS域内进行跨基站移动时， 无 需重入网以及重建 MBS业务连接，可以不受影响的接收 MBS业务，实现 MBS 0 业务的无缝切换。
但是， 在实际应用中， 会存在以下问题： 在某些情况下， 终端根据协议 802.16e-2005的描述移动到 MBS域内其它基站的范围内后， 会产生长时间得 不到服务的现象。
造成这种情况的主要原因在于， 由于 802.16e协议没有描述 IDLE模式终 5 端在 MBS域内移动保持 MBS业务的过程及具体步骤。在特殊情况下 ,如 IDLE 模式终端在会话开始之后， 从原服务基站移动到同一 MBS域内的另一基站范 围内， 所移动的目标基站所属的寻呼组和原基站相同， 在此情况下， 终端不会 执行位置更新 , 如果该目标基站由于没有用户接收该 MBS业务或者使用该业 务的用户数低于门限， 而没有使用点到多点（Point to Multipoint, 简称" PTM" ) :0 模式播放业务时， 处于空闲模式的终端无法得到所需要的业务。 比如， 在会话 开始之前， 已加入业务的空闲模式终端移动到同一 MBS域同一寻呼组内的另 一基站范围内时， 如果移动的目标基站由于没有其他终端使用该 MBS业务而 没有播放该业务，且在会话开始前，目标基站依旧未感知到该终端的存在的话， 则目标基站不会为该移动到其范围内的终端提供相应的 MBS业务， 该终端只 ：5 能等到周期性位置更新或者基站发起周期性用户数统计后 ,才能得到所需要的 MBS月良务。
发明内容
有鉴于此，本发明的实施方式提供一种多播广播系统中终端移动的方法和 基站， 使得空闲状态终端在移动时， 能够保持多播广播业务的连续性。 为实现上述目的，本发明的实施方式提供了一种多播广播系统中终端移动 的方法， 包括步骤：
目标基站获取空闲模式下的终端需要接收的多播广播业务的信息； 根据所获取的信息为所述终端提供对应的多播广播业务。
5 本发明的实施方式还提供了一种基站， 包括：
信息获取模块，用于在空闲模式下的终端移动到所述目标基站覆盖范围内 时 , 获取所述终端需要接收的多播广播业务的信息；
业务提供模块，用于根据所述信息获取模块获取的信息为所述终端提供多 播广播业务。
0 由此可知，本发明的实施方式通过空闲模式下的终端在不同寻呼组间移动 时， 发起位置更新流程， 该流程通知该目标基站所述终端需要接收的 MBS业 务的信息，使得目标基站能够根据获取的信息为该终端提供对应的 MBS业务， 从而确保终端在不同 MBS域或不同寻呼组之间移动时， 能够保持 MBS业务 的连续性， 避免终端在移动后长时间得不到服务。
5 附图说明
图 1是现有技术中 WiMAX网络逻辑结构图；
图 2是根据本发明第一实施方式的多播广播系统中终端移动的方法流程 图；
图 3 是根据本发明第二实施方式的多播广播系统中终端移动的方法流程
:0 图；
图 4是根据本发明第三实施方式的多播广播系统中终端移动的方法流程 图；
图 5 是根据本发明第四实施方式的多播广播系统中终端移动的方法流程 图；
:5 图 6是根据本发明第五实施方式的多播广播系统中终端移动的方法流程 图；
图 7是根据本发明第六实施方式的多播广播系统中终端在不同 MBS域之 间移动的方法流程图；
图 8是根据本发明第七实施方式的基站结构示意图。 具体实施方式
本发明的实施方式中 , 空闲模式下的终端在移动到目标基站覆盖范围内 时， 如果满足预设的上报条件， 则通知该目标基站本终端需要接收的 MBS业 务的信息， 使得目标基站能够及时获取下辖终端的 MBS业务的信息， 并为该
5 终端提供对应的 MBS业务， 从而保证终端在移动前后 MBS业务的连续性。
下面对本发明第一实施方式进行说明。第一实施方式涉及多播广播系统中 终端移动的方法，该方法适用于 WiMAX系统的多播广播系统， 即本实施例中 的 MBS业务 于 WiMAX系统的 MBS业务， 具体如图 2所示。
终端在移动到目标基站覆盖范围内时， 进入步骤 201， 终端首先判断该目
0 标基站与终端的原服务基站是否属于同一寻呼组以及是否属于同一 MBS域， 终端可以通过监听目标基站的信息，判断目标基站与原基站是否属于同一寻呼 组或同一 MBS域。 如果目标基站与原基站属于同一寻呼组同一 MBS域， 则 进入步骤 202;如果目标基站与原基站不属于同一寻呼组但属于同一 MBS域， 则进入步骤 211， 终端向目标基站发起位置更新流程， 通过位置更新操作通知
5 目标基站本终端的 MBS业务信息， 并接着进入步骤 206， 目标基站判断当前 是否已经建立该 MBS业务的承载；如果目标基站与原基站不属于同一个 MBS 域， 则进入步骤 213 , 终端需要退出空闲模式或发起位置更新流程， 接收目标 基站发送的 MBS业务信息， 并更新终端存储的 MBS业务信息， 以保证终端 可以从其他 MBS域连续接收其 MBS业务， 具体参见本发明第六实施方式。
:0 如果终端移动的目标基站与原基站属于同一寻呼组同一 MBS域， 则在步 骤 202中， 终端进一步判断当前该 MBS业务会话是否已经开始， 如果业务已 经开始， 即终端已经在接收 MBS业务数据， 则进入步骤 203， 反之则结束本 流程。 关于在 MBS业务开始前终端发生移动的情况下， 如何确保该终端在业 务开始时及时接收该 MBS业务， 可参见本发明第三、 第四、 第五实施方式。
：5 在步骤 203中，终端根据移动之前得到的" MBS资源映射消息 MBS MAP" 消息指示的 Next MBS Frame Offset (下一个 MBS业务的帧偏移量）， 在指定 的帧接收所需的" MBS资源映射消息 MBS MAF，消息（该消息中包含接收业务 所需的多播连接标识 Multicast CID标识， 简称 "MCID" )， 如果在指定的帧收 到了终端所需的" MBS MAP"消息， 则进入步骤 212, 按照现有技术继续同步 接收其 MBS业务； 反之则进入步骤 204。
由于终端在接收基站所发送的" MBS MAP"消息时可能失去同步， 从而无 法正确接收该消息， 针对这一点， 在步骤 204中， 终端通过监听 "下行资源映 射消息 DL— MAP"消息来获取所需的" MBS MAP"消息，如果在预定时限内，终
5 端得到了所需的" MBS MAP"消息， 则同样进入步骤 212， 按照现有技术继续 同步接收其 MBS业务； 反之，如果超过预定时限， 终端还未收到对应的 "MBS MAP"消息，则表明该目标基站并未多播播放该 MBS业务数据，进入步骤 205。
在步骤 205中，终端通知该目标基站本终端需要接收的 MBS业务的信息， 以提示目标基站当前存在一个该 MBS业务的用户需要接收业务。
0 终端可以通过发起位置更新 ( Location Update )流程，在位置更新流程中， 扩充测距请求 "RNG— REQ"消息，在该消息中携带终端正在使用的 MBS业务信 息，通过" RNG— REQ"消息上报本终端的 MBS业务信息；或者终端通过位置更 新的过程中， 锚寻呼控制器（Paging Controller, 简称" PC" ) 向目标基站返回 的位置更新响应" Location Update Response"消息， 在该响应消息中携带该终端
5 正在使用的 MBS业务信息， 通知基站该终端的 MBS业务信息。 通过以上方 式， 在终端进入空闲模式的时候， 网络侧需要将该终端的 MBS业务相关的信 息发送到锚 PC保存。 MBS业务信息包含： MBS业务 ID(多播广播业务标识）、 Content ID (内容标识）、 Multicast CID、 MGSAID (多播广播业务组安全联盟 标识）、 SFID (服务流标识）、 MBS Zone ID (多播广播业务域标识）、 IP多播
:0 地址等。 接着进入步骤 206。
如果目标基站没有播放业务， 目标基站未多播播放终端所需的 MBS业务 数据的原因有多种， 可能是：
a)该 MBS业务当前没有数据需要播放；
b)目标基站的覆盖范围内， 由于某种原因（比如当前没有用户需要接收该 ：5 MBS业务）， 而没有播放该业务数据；
c)由于接收该 MBS业务的用户较少，目标基站使用点到点（ Point to Point, 简称" PTP" )模式播放该 MBS业务数据。
因此在步骤 206中， 目标基站收到该终端的 MBS业务信息后， 判断当前 是否已经承载该 MBS业务， 如果当前确实已经承载并选用 PTM模式播放业 务， （即在会话已开始的情况下， 终端即使没有收到数据， 也只是由于该 MBS 业务暂时没有数据需要发送）， 此时进入步骤 212, 终端根据现有技术等待并 同步接收该 MBS业务； 如果当前确实已经承载， 但目标基站选用 PTP模式播 放该 MBS业务， 则直接进入步骤 210; 如果当前未承载该业务， 则进入步骤 5 207。 通过多重判断， 过滤出终端未收到 MBS业务数据的各种原因，根据不同 的原因， 针对性地进行处理， 确保终端能够成功地从目标基站接收其所需的 MBS业务数据。
可选地， 目标基站收到终端的通知后， 可以对本基站下当前使用 MBS业 务的用户数进行统计，如果当前使用 PTP模式传输该 MBS业务且当前用户数 0 超过预置门限， 则将该 MBS业务的传输模式转换为 PTM。
在步骤 207中， 目标基站尚未承载该 MBS业务， 则目标基站向上游网关 节点进行注册， 要求承载该 MBS业务， 并在必要时建立该 MBS业务的承载 通道。网关节点与目标基站注册以及建立承载通道的方法可参见现有技术中会 话开始方案。
5 接着进入步骤 208, 基站根据实际情况确定当前是否选择使用 PTM模式 为终端提供该 MBS业务， 如果是则进入步骤 209; 反之， 如果选择使用 PTP 模式传输该 MBS业务， 则进入步骤 210。
在步骤 209 中， 目标基站使用所在 MBS 域约定的 Multicast CID 以及
MGSAID,通过 PTM模式发送该 MBS业务数据。终端只需继续监听" DL— MAP" :0 消息就可以得到自己需要的 MBS业务数据， 有效防止终端移动到目标基站后 长时间无法接收 MBS业务的现象。
在步骤 210中， 目标基站选择使用 PTP方式为用户提供服务， 则目标基 站使用从位置更新流程得到的 Paging Info (寻呼信息）激活用户 , 之后对该终 端执行 PTM到 PTP的模式转换， 指示该终端通过 PTP的连接接收该 MBS业 :5 务数据。使得目标基站在使用 PTP模式以更少的网络资源传输 MBS业务数据 的同时， 不影响移动到其覆盖范围内的终端接收该 MBS业务， 弥补了现有技 术中的不足。
本发明第二实施方式主要涉及多播广播系统中终端移动的方法，该方法适 用于 WiMAX系统的多播广播系统， 本实施例中的 MBS业务是基于 WiMAX 系统的 MBS业务， 具体如图 3所示。 在本实施方式中， 为了使终端能够明确 判断其 MBS业务在目标基站的播放情况， 目标基站在广播信令中明确标识出 当前该 MBS业务是否被播放以及该业务当前是否通过 PTM模式播放。 通过 这一方式， 使得终端能够轻松判断其所需的 MBS业务的播放情况， 以便终端 5 根据实际情况主动配合目标基站更新其下终端信息，促使目标基站为其提供相 应的 MBS业务。
终端在移动到目标基站覆盖范围内时， 进入步骤 301， 终端首先判断该目 标基站与终端的原服务基站是否属于同一寻呼组以及是否属于同一 MBS域， 终端可以通过监听目标基站的信息，判断目标基站与原基站是否属于同一寻呼 0 组或同一 MBS域。 如果目标基站与原基站属于同一寻呼组同一 MBS域， 则 进入步骤 302;如果目标基站与原基站不属于同一寻呼组但属于同一 MBS域， 则进入步骤 310， 进行位置更新操作， 通过位置更新操作通知目标基站本终端 的 MBS业务信息， 并接着进入步骤 305， 后继的处理与实施方式一中相同； 如果目标基站与原基站不属于同一个 MBS域， 则进入步骤 312， 终端需要退 5 出空闲模式或发起位置更新流程， 接收目标基站发送的 MBS业务信息， 更新 终端存储的 MBS业务信息 , 以保证终端可以从其他 MBS域连续接收其 MBS 业务， 具体参见本发明第六实施方式。
如果终端移动的目标基站与原基站属于同一寻呼组同一 MBS域， 则在步 骤 302中， 终端进一步判断当前该 MBS业务会话是否已经开始， 如果业务已 :0 经开始， 即终端已经在接收 MBS业务数据， 则进入步骤 303， 反之则结束本 流程。 关于在 MBS业务开始前终端发生移动的情况下， 如何确保该终端在业 务开始时及时接收该 MBS业务， 可参见本发明第三、 第四、 第五实施方式。
在步骤 303中，终端根据目标基站的广播信令判断该目标基站当前是否通 过 PTM模式播放其所需的 MBS业务， 如果是则进入步骤 311， 根据现有技术 ：5 接收该 MBS业务； 反之， 如果该目标基站当前未播放该 MBS业务或在 PTP 模式下播放该 MBS业务， 则进入步骤 304。
在步骤 304中，终端通知该目标基站本终端需要接收的 MBS业务的信息， 以提示目标基站当前新增一个该 MBS业务的用户需要接收业务。
终端可以通过发起位置更新 ( Location Update )流程，在位置更新流程中， 扩充" RNG— REQ"消息，在该消息中携带终端正在使用的 MBS业务信息，通过 "RNG— REQ"消息上报本终端的 MBS业务信息；或者终端通过位置更新的过程 中， 错 PC向目标基站返回的" Location Update Response"响应消息 , 在该响应 消息中携带该终端正在使用的 MBS业务信息， 通知基站该终端的 MBS业务
5 信息。 通过上述方法， 在终端进入空闲模式的时候， 网络侧需要将该终端的 MBS业务相关的信息发送到锚 PC保存。 MBS业务信息包含： MBS业务 ID、 Contents ID, Multicast CID、 MGSAID、 SFID、 MBS Zone ID, IP多播地址等。
接着进入步骤 305， 目标基站收到该终端的 MBS业务信息后， 判断当前 是否已经承载该 MBS业务， 如果已经承载且目标基站选用 PTM模式播放该
0 MBS业务， 则结束本流程； 如果当前已经承载， 但目标基站选用 PTP模式播 放该 MBS业务， 则直接进入步骤 309; 反之， 如果当前未承载该 MBS业务， 则进入步骤 306。 通过判断， 过滤出终端未收到 MBS业务数据的各种原因， 根据不同的原因，针对性地进行处理，确保终端能够成功地从目标基站接收其 所需的 MBS业务数据。
5 步骤 306至步骤 309与步骤 207至步骤 210相类似， 在此不再赞述。
另外作为本发明第一实施方式与第二实施方式的补充，也可以使用如下方 法使基站获得空闲态终端的 MBS业务信息： 对于已加入 MBS业务的空闲态 终端， 一旦发现其移动到了新的基站的覆盖范围内， 则终端会发起一次位置更 新过程， 基站通过位置更新过程， 可获得该终端加入了该 MBS业务的信息，
:0 进而可以为终端提供所需的业务。
本发明第三实施方式主要涉及多播广播系统中终端移动的方法，该方法适 用于 WiMAX系统， 该方法中的 MBS业务是基于 WiMAX系统的 MBS业务， 具体如图 4所示。 在本实施方式中， 空闲模式下的终端是在其 MBS业务开始 之前，移动到目标基站的覆盖范围内。本实施方式适用于需要进行数据加密的
：5 MBS业务。
在步骤 401中， MBS服务器在 MBS业务会话开始之前， 进行 MBS业务 密钥的更新，通过发起密钥更新流程下发相关消息， 指示各终端向其所属的基 站上 终端所加入的 MBS业务的信息。 使基站在 MBS业务开始前， 能够得 到其管理范围内使用该业务的终端信息， 同时也能够确认终端所处的位置。避 免因为基站所知道的其覆盖范围内终端信息与实际的不符，而导致新移动到该 基站范围内的终端无法正确接收其 MBS业务。
接着进入步骤 402， 移动到目标基站覆盖范围内的空闲模式终端， 收到该 密钥更新流程的消息后， 向目标基站上 4艮其 MBS业务信息。
5 接着进入步骤 403， 目标基站收到该终端的 MBS业务信息后， 确定本基 站覆盖范围内存在终端需要接收该 MBS业务消息， 判断本基站是否已经向上 游网关节点注册该 MBS业务， 如果是则直接进入步骤 405, 反之则进入步骤 404, 目标基站向上游网关节点注册， 要求承载该 MBS业务。
在步骤 405中， 目标基站在该 MBS业务会话开始时，建立业务承载通道， 0 该目标基站以选定的 PTP/PTM模式向终端播放该 MBS业务的数据， 具体的 播放方式可参见现有技术。
本发明第四实施方式主要涉及多播广播系统中终端移动的方法，该方法适 用于 WiMAX系统， 该方法中的 MBS业务是基于 WiMAX系统的 MBS业务， 具体如图 5所示。 在本实施方式中， 空闲模式下的终端是在其 MBS业务开始 5 之前， 移动到目标基站的覆盖范围内。
在步骤 501中 , 终端在其 MBS业务开始前， 通过 Service Announcement (业务公告 )获取该 MBS业务的开始时间。 终端获取 MBS业务开始时间的 方式有多种， 除了通过 Service Announcement获取外， 也可以在会话开始前一 段时间由网络侧主动通知终端。
:0 接着进入步骤 502， 终端在离该 MBS业务开始的时间小于预设时长时， 即在该 MBS业务开始前的预设时长内， 发起终端的位置更新流程， 通过该位 置更新流程通知该目标基站本终端需要接收的 MBS业务。 为了防止所有的终 端在同一时刻发起位置更新流程而对网络形成冲击， 终端可以在离该 MBS业 务开始的时间小于预设时长时，产生一个随机长度的延迟，该延迟过后再发起 ：5 位置更新流程。通过终端主动配合基站更新其覆盖范围内的终端信息， 能够有 效避免因为基站所知道的其覆盖范围内终端信息与实际的不符，而导致新移动 到该基站范围内的终端无法正确接收其 MBS业务。
终端可以在位置更新流程中扩充" RNG— REQ"消息， 在该消息中携带终端 正在使用的 MBS业务信息， 通过" RNG— REQ"消息上报本终端的 MBS业务信 息；或者终端通过位置更新的过程中，锚 PC向目标基站返回的 "Location Update Response"消息， 在该响应消息中携带该终端正在使用的 MBS业务信息， 通知 基站该终端的 MBS业务信息。 通过上述方法， 在终端进入空闲模式的时候， 网络侧需要将该终端的 MBS业务相关的信息发送到锚 PC保存。 MBS业务信
5 息包含： MBS业务 ID、 Contents ID、 Multicast CID、 MGSAID、 SFID、 MBS Zone ID、 IP多播地址等。
接着进入步骤 503， 目标基站收到该终端的 MBS业务信息后， 判断本基 站是否已经向上游网关节点注册该 MBS业务， 如果是则直接进入步骤 505， 反之则进入步骤 504， 目标基站向上游网关节点注册， 要求承载该 MBS业务。
0 在步骤 505中， 目标基站在该 MBS业务会话开始时，建立业务承载通道， 该目标基站以选定的 PTP/PTM模式向终端播放该 MBS业务的数据， 具体的 播放方式可参见现有技术。
本发明第五实施方式主要涉及多播广播系统中终端移动的方法，该方法适 用于 WiMAX系统， 该方法中的 MBS业务是基于 WiMAX系统的 MBS业务，
5 具体如图 6所示。本实施方式中， 空闲模式下的终端在其 MBS业务开始之前， 移动到目标基站的覆盖范围内。
在步骤 601中， 目标基站不论 MBS业务会话是否开始， 当前基站覆盖范 围内是否有终端使用该 MBS业务， 都发起周期性用户统计。 通过用户统计， 更新目标基站中终端的信息，确保目标基站及时为终端提供相应的 MBS业务。
:0 接着进入步骤 602， 移动到该目标基站的终端收到其周期性发起的用户统 计消息后， 向目标基站上报其 MBS业务信息。 接着进入步骤 603。
步骤 603至步骤 605与步骤 503至步骤 505相类似， 在此不再赞述。
以上各方案是在不变更终端的位置更新条件的前提下，对终端可能存在的 移动后无法接收其 MBS业务的现象进行判断和处理。
:5 作为上述方案的扩充，也可以考虑扩展终端进行位置更新的条件： 对于已 加入 MBS业务的空闲模式下的终端（无论该业务是否已经开始），只要其更换 了基站， 就要执行一次位置更新流程， 促使终端向移动后的目标基站上报其 MBS 业务信息， 以便网络侧能够及时更新该终端的位置， 相应的目标基站能 够及时提供对应的 MBS业务。 本发明第六实施方式涉及终端在不同 MBS域之间移动的方法， 具体如图 7所示。
在终端移动后的目标基站与原基站不属于同一个 MBS域时， 即终端在移 动过程中跨了原 MBS域时， 为了保证终端继续可以连续接收其之前正在接收 5 的 MBS业务， 需要更新相应的在 MBS域内唯一的相关 MBS业务信息， 如 MBS业务 ID、 Content ID、 LCID、 MCID, GSAID, SFID以及 MBS业务传 输密钥等， 此时终端需退出空闲模式。
如果终端此时已经获知目标基站不能够承载该 MBS业务， 则无需再采取 本实施方式， 否则如图 7所示， 在步骤 701中， 终端通过 RNG— REQ消息通知 0 目标基站本终端退出空闲模式。
接着进入步骤 702， 目标基站收到该消息后， 向锚 PC发送退出空闲模式 请求。
接着进入步骤 703， 锚 PC收到该请求后， 向该目标基站返回的空闲模式 退出响应消息 , 并在该响应消息中携带该终端用户的原始 MBS业务信息。
5 接着进入步骤 704， 目标基站可以通过该信息获知该终端之前正在接收或 者已加入的 MBS业务信息， 此时如果当前目标基站所在的 MBS域也能够承 载该 MBS业务， 则目标基站根据当前 MBS域的对应信息， 构造 RNG— RSP 消息， 向终端返回当前基站所属 MBS域中该 MBS业务使用的 MBS业务 ID、 Content ID, LCID、 MCID, SFID, GSAID等内容； 反之如果目标基站没有能
:0 力承载该 MBS 业务， 则通过 RNG— RSP 消息通知该终端： 本基站不提供该 MBS业务。
如果当前该目标基站没有真正承载该 MBS业务， 但有能力承载该 MBS 业务， 则进入步骤 705， 由目标基站所在的服务 ASN发起该 MBS业务的承载 相关过程的处理， 以保证该 MBS业务的数据以及业务信息能够及时发送给该
：5 终端。
所述终端在获取上述内容后， 在需要时， 可选地发起密钥请求过程， 获取 该 MBS业务的传输密钥， 通过上述内容和 MBS业务的传输密钥继续使用业 务。
在获取业务之后 , 终端可以再次发起进入空闲模式的流程回到空闲模式。 对于一般情况下终端退出空闲模式， 终端的 MBS业务信息也可以以上述方式 传输到基站， 并引发基站的承载调整流程。
作为对实施例六的补充，可以有对应的优化流程，即终端不退出 Idle模式， 通过位置更新流程通知基站其所需要的 MBS业务， 通知的方式可以通过扩展 5 RNG-REQ或者位置更新响应消息，在此不再赘述。基站将该 MBS域内该 MBS 业务对应的参数通过 RNG-RSP返回给终端。
本发明第七实施方式涉及一种基站， 如图 8所示， 包含信息获取模块， 用 于在空闲模式下的终端移动到目标基站覆盖范围内时， 获取终端需要接收的 MBS业务的信息，促使基站更新其覆盖范围内的终端的 MBS业务信息，从而 0 避免因为基站所知道的其覆盖范围内终端信息与实际的不符，而导致新移动到 该基站范围内的终端无法正确接收其 MBS业务； 业务提供模块， 用于在基站 未注册获取模块获取的信息指示的 MBS业务时， 向上级网关节点注册业务， 与上级网关节点建立业务的承载通道， 并通过点到点或点到多点模式， 为终端 提供 MBS业务。
5 所述信息获取模块可以包括下述任一子模块或其任意组合：用于从通过终 端发起的位置更新流程中获取终端需要接收的 MBS业务信息的模块； 用于从 终端在跨越多播广播业务域时发起的退出空闲模式的流程中获取该终端需要 接收的多播广播业^言息的模块；用于从周期性用户统计流程中获取终端需要 接收的 MBS业务信息的模块； 用于从 MBS服务器发起的密钥更新流程中获
:0 取终端需要接收的 MBS业^言息的模块。
其中， 终端在满足以下条件之一时， 发起位置更新流程， 获取模块通过该 位置更新流程获取该终端的 MBS业务信息： 目标基站与终端的原服务基站属 于不同的寻呼组； MBS 业务已开始， 且终端在目标基站的覆盖范围内， 未收 到 MBS业务的数据； 终端确定目标基站未播放 MBS业务或在点到点模式下
：5 播放 MBS业务； 当前距离终端需要接收的 MBS业务开始的时间小于预设时 长。 以上各信息获取方法和预设条件涵盖了终端移动后无法收到 MBS业务的 各种可能性的判断方法， 以及检测手段，从各个角度杜绝了基站不知道移动到 其覆盖范围内终端信息的可能性，为移动中的终端接收 MBS业务提供了保障。
优选的， 所述业务提供模块可以包括下述模块之一或其任意组合： 用于在所述多播广播业务已注册时，对当前使用点到点模式传输所述多播 广播业务的用户数进行统计，如果当前使用点到点模式传输该多播广播业务且 所述用户数超过预置门 P艮，则将该多播广播业务的传输模式转换为点到多点的 模块；
5 用于在所述多播广播业务未注册时，向上级网关节点注册所述多播广播业 务，在与所述上级网关节点之间建立所述多播广播业务的承载通道后，通过点 到点或点到多点模式， 为所述终端提供所述多播广播业务的模块。
优选的， 所述业务提供模块还可以包括： 用于在通过点到点模式为所述终 端提供所述多播广播业务时，指示所述终端进入激活模式， 并通过点到点的连 0 接接收终端发送的所述多播广播业务数据的模块。
由上述实施方式可知，本发明通过空闲模式下的终端在不同寻呼组间移动 时， 发起位置更新流程， 该流程通知该目标基站所述终端需要接收的 MBS业 务的信息，使得目标基站能够根据获取的信息为该终端提供对应的 MBS业务， 从而确保终端在不同 MBS域或不同寻呼组之间移动时， 能够保持 MBS业务 5 的连续性， 避免终端在移动后长时间得不到服务。
在终端在不同 MBS域的基站间移动时， 为了能够继续接收原先的 MBS 业务内容，终端必须退出空闲模式，目标基站能够通过其退出空闲模式的流程， 从锚 PC获取该终端需要接收的 MBS业务信息， 从而提供对应的 MBS业务。
在 MBS业务开始后， 空闲模式下的终端从原基站移动到同一寻呼组同一 :0 MBS 域的目标基站覆盖范围内时， 如果终端在目标基站的覆盖范围内， 未收 到 MBS业务的数据， 或终端根据目标基站在广播信令包含的信息， 判定目标 基站未播放该 MBS业务或在 PTP模式下播放该 MBS业务， 则通过位置更新 流程通知该目标基站本终端需要接收的 MBS业务的信息， 促使目标基站为该 终端提供对应的 MBS业务， 从而确保终端在 MBS业务开始后， 在 MBS域内 :5 移动时，能够保持 MBS业务的连续性，避免终端在移动后长时间得不到服务。
对于空闲模式下的终端在 MBS业务开始前， 从原基站移动到同一寻呼组 同一 MBS域的目标基站覆盖范围内的情况， 由目标基站在业务开始前发起更 新流程， 通过该流程命令终端上报其需要接收的 MBS业务的信息， 从而在业 务开始时， 目标基站能够及时为该终端提供对应的 MBS 业务， 使得终端在 MBS域内移动时， 不会影响其即将开始的 MBS业务的正常接收。 当前离终端需要接收的 MBS业务开始的时间小于预设时长时， 终端上报 需要接收的 MBS业务， 使得在业务开始时， 基站能够正常提供该业务， 确保 终端在 MBS域内移动时， 能够正常接收其 MBS业务。
目标基站发起周期性用户统计，空闲模式下的终端从原基站移动到同一寻 呼组同一 MBS域的目标基站覆盖范围内后 , 通过该用户统计过程上报需要接 收的 MBS 业务的信息， 从而在业务开始时， 能够及时为该终端提供对应的
MBS业务，使得终端在 MBS域内移动时， 不会影响其 MBS业务的正常接收。
目标基站收到终端的 MBS信息后， 如果当前为对该 MBS业务注册， 则 向上级网关节点注册该业务， 与该上级网关节点建立 MBS业务的承载通道， 并通过 PTP或 PTM模式， 为终端提供该业务， 保证终端移动过程中业务的连 续性。
如果目标基站通过 PTP模式为终端提供该 MBS业务， 则指示终端进入激 活模式， 为终端建立点到点的连接， 使该终端成功接收该 MBS的数据。
虽然通过参照本发明的某些优选实施方式，已经对本发明进行了图示和描 述，但本领域的普通技术人员应该明白，可以在形式上和细节上对其作各种改 变， 而不偏离本发明的精神和范围。

Claims

权 利 要 求
1. 一种多播广播系统中终端移动的方法， 其特征在于， 包括： 目标基站获取空闲模式下的终端需要接收的多播广播业务的信息； 根据所获取的信息为所述终端提供对应的多播广播业务。
5 2. 根据权利要求 1所述的多播广播系统中终端移动的方法，其特征在于， 所述目标基站通过终端发起的位置更新流程获取所述终端需要接收的多播广 播业务信息。
3. 根据权利要求 2所述的多播广播系统中终端移动的方法，其特征在于， 所述终端在满足预设条件时， 发起所述位置更新流程， 其中， 所述预设条
0 件至少包括下述条件之一：
所述终端移动到新的基站；
所述终端的原服务基站与移动后的目标基站属于不同的寻呼组； 所述终端的原服务基站与移动后的目标基站属于不同多播广播业务域； 所述多播广播业务已开始，且所述终端在目标基站的覆盖范围内， 未收到 5 所述多播广播业务的数据；
所述终端确定所述目标基站未承载所述多播广播业务或在点到点模式下 播放所述多播广播业务；
当前距离所述终端需要接收的多播广播业务开始的时间小于预设时长。
4. 根据权利要求 3所述的多播广播系统中终端移动的方法，其特征在于， :0 如果所述预设条件是所述终端确定所述目标基站未承载所述多播广播业务或 在点到点模式下播放所述多播广播业务， 则所述方法还包括：
目标基站在广播信令中携带用于标识是否承载所述多播广播业务的信息 以及标识所述业务播放模式的信息，所述终端根据所述信息确定是否满足所述 预设条件。
：5
5. 根据权利要求 1所述的多播广播系统中终端移动的方法，其特征在于， 如果所述目标基站与所述终端的原服务基站属于不同的多播广播业务域，则所 述目标基站获取空闲模式下的终端需要接收的多播广播业务的信息包括：
所述目标基站通过所述终端退出空闲模式的流程或所述终端发起的位置 更新流程， 获取该终端需要接收的多播广播业务信息。
6. 根据权利要求 1所述的多播广播系统中终端移动的方法，其特征在于， 所述目标基站通过以下方式获取所述终端需要接收的多播广播业务信息：
所述目标基站通过周期性用户统计流程获取所述终端需要接收的多播广 播业务信息； 或
5 所述目标基站通过多播广播业务服务器发起的密钥更新流程获取所述终 端需要接收的多播广播业^言息。
7.根据权利要求 1至 6中任一项所述的多播广播系统中终端移动的方法， 其特征在于， 所述目标基站如果无能力承载所述多播广播业务， 则通知所述终 端本基站不支持该多播广播业务。
0 8.根据权利要求 1至 6中任一项所述的多播广播系统中终端移动的方法， 其特征在于，所述终端在进入空闲模式时将多播广播业务的信息保存到锚寻呼 控制器。
9.根据权利要求 2至 6中任一项所述的多播广播系统中终端移动的方法， 其特征在于， 所述终端通过位置更新流程中的测距请求消息，通知所述目标基
5 站本终端需要接收的多播广播业务的信息； 或
所述终端通过位置更新流程中的位置更新响应消息，通知所述目标基站本 终端需要接收的多播广播业务的信息。
10.根据权利要求 2至 6中任一项所述的多播广播系统中终端移动的方法， 其特征在于， 所述目标基站获取所述终端的多播广播业务信息后，如果所述目
:0 标基站未注册所述业务， 则该目标基站向上级网关节点注册所述业务，在所述 目标基站与上级网关节点之间建立所述业务的承载通道，并通过点到点或点到 多点模式， 为所述终端提供所述业务。
11.根据权利要求 2至 6中任一项所述的多播广播系统中终端移动的方法， 其特征在于， 所述目标基站获取所述终端的多播广播业务信息后，
:5 如果所述目标基站已注册所述业务，则对本基站覆盖范围内当前使用所述 多播广播业务的用户数进行统计 ,如果当前使用点到点模式传输该多播广播业 务且所述用户数超过预置门限，则将该多播广播业务的传输模式转换为点到多 点。
12.根据权利要求 2至 6中任一项所述的多播广播系统中终端移动的方法， 其特征在于，如果所述目标基站通过点到点模式为所述终端提供所述多播广播 业务， 则指示所述终端进入激活模式，通过点到点的连接接收所述多播广播业 务数据。
13.根据权利要求 1至 6中任一项所述的多播广播系统中终端移动的方法， 5 其特征在于， 所述多播广播业务信息至少包括以下之一：
多播广播业务标识、 内容标识、 多播连接标识、 多播广播业务组安全联盟 标识以及服务流标识。
14. 一种基站， 其特征在于， 包含：
信息获取模块，用于在空闲模式下的终端移动到所述目标基站覆盖范围内 0 时， 获取所述终端需要接收的多播广播业务的信息；
业务提供模块，用于根据所述信息获取模块获取的信息为所述终端提供多 播广播业务。
15. 根据权利要求 14所述的基站， 其特征在于， 所述信息获取模块至少 包括下述模块之一：
5 用于从终端发起的位置更新流程中获取所述终端需要接收的多播广播业 务信息的模块；
用于从终端跨越多播广播业务域时发起的退出空闲模式的流程中获取该 终端需要接收的多播广播业 ^言息的模块；
用于从周期性用户统计流程中获取所述终端需要接收的多播广播业务信 :0 息的模块；
用于从多播广播业务服务器发起的密钥更新流程中获取所述终端需要接 收的多播广播业^言息的模块。
16. 根据权利要求 15所述的基站， 其特征在于，
所述终端在满足以下条件之一时，发起所述位置更新流程， 所述信息获取 ：5 模块通过该位置更新流程获取该终端的多播广播业务信息：
所述目标基站与所述终端的原服务基站属于不同的寻呼组；
所述多播广播业务已开始，且所述终端在目标基站的覆盖范围内， 未收到 所述多播广播业务的数据；
所述终端确定所述目标基站未播放所述多播广播业务或在点到点模式下 播放所述多播广播业务；
当前距离所述终端需要接收的多播广播业务开始的时间小于预设时长。
17. 根据权利要求 14所述的基站， 其特征在于， 所述业务提供模块至少 包括下述模块之一：
用于在所述多播广播业务已注册时，对当前使用点到点模式传输所述多播 广播业务的用户数进行统计，如果当前使用点到点模式传输该多播广播业务且 所述用户数超过预置门 P艮，则将该多播广播业务的传输模式转换为点到多点的 模块；
用于在所述多播广播业务未注册时，向上级网关节点注册所述多播广播业 务，在与所述上级网关节点之间建立所述多播广播业务的承载通道后，通过点 到点或点到多点模式， 为所述终端提供所述多播广播业务的模块。
18. 根据权利要求 17所述的基站， 其特征在于， 所述业务提供模块还包 括：
用于在通过点到点模式为所述终端提供所述多播广播业务时，指示所述终 端进入激活模式，并通过点到点的连接接收终端发送的所述多播广播业务数据 的模块。
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