WO2008113263A1 - Method for supporting multimedia broadcast/multicast service in evolvement of system architecture - Google Patents

Method for supporting multimedia broadcast/multicast service in evolvement of system architecture Download PDF

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Publication number
WO2008113263A1
WO2008113263A1 PCT/CN2008/000555 CN2008000555W WO2008113263A1 WO 2008113263 A1 WO2008113263 A1 WO 2008113263A1 CN 2008000555 W CN2008000555 W CN 2008000555W WO 2008113263 A1 WO2008113263 A1 WO 2008113263A1
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WO
WIPO (PCT)
Prior art keywords
broadcast multicast
multimedia broadcast
multicast service
system architecture
service
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PCT/CN2008/000555
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English (en)
French (fr)
Inventor
Hua Chao
Zhongji Hu
He Wang
Yonggang Wang
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Alcatel Shanghai Bell Co., Ltd.
Alcatel Lucent
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Application filed by Alcatel Shanghai Bell Co., Ltd., Alcatel Lucent filed Critical Alcatel Shanghai Bell Co., Ltd.
Priority to JP2009553892A priority Critical patent/JP5653044B2/ja
Priority to US12/531,744 priority patent/US8451764B2/en
Priority to EP08715008A priority patent/EP2141823A4/en
Publication of WO2008113263A1 publication Critical patent/WO2008113263A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/40—Connection management for selective distribution or broadcast
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/18—Service support devices; Network management devices

Definitions

  • the present invention relates to supporting evolved multimedia broadcast multicast services in a core network of a wireless communication system
  • EMBMS Evolved Multimedia Broadcast/Multicast Semce
  • SAE/LTE System Architecture Deduction/Long Term Evolution
  • LTE Long Term Evolution
  • Multimedia Broadcast Multicast Service is a service introduced by 3GPP REL6, which refers to a point-to-multipoint service in which a data source sends data to multiple users, thereby realizing resource sharing between the network (including the core network and the access network). Achieve services for as many multimedia users as possible with the same needs with as few resources as possible.
  • the MBMS service can realize low-rate message-like multicast and broadcast, and can also realize multicast and broadcast of higher-rate multimedia services by using a common transport channel and a public radio bearer, for example, Mobile TV.
  • Fig. 1 schematically shows a mobile communication network as an example of a WCDMA system.
  • a plurality of base stations (NodeBs) 11 , 2, 13 and the like in a mobile communication network are connected to a base station controller (RNC) 10.
  • RNC base station controller
  • a radio network controller 10 manages a thousand base stations, and a NodeB and an RNC are connected by a wired transmission, and an interface between the two is defined as an Iub interface.
  • the RNC 10 can also be connected to the SGSN device of the System Architecture Evolution Network (CN) via the Iu interface. .
  • CN System Architecture Evolution Network
  • the network elements supporting MBMS mainly include: BM-SC (Broadcast Multicast Service Center), GGSN (GPRS Gateway Support Node), SGSN (Serving Gateway Support Node), Access Network (UTRAN) including Base Station (NodeB) and Wireless Network Control (KNC), UE (user equipment).
  • BM-SC Broadcast Multicast Service Center
  • GGSN GPRS Gateway Support Node
  • SGSN Serving Gateway Support Node
  • Access Network UTRAN
  • NodeB Base Station
  • KNC Wireless Network Control
  • UE user equipment
  • the BM-SC is an entry for the content provider for authorizing and initiating the MBMS bearer service in the PLMN (land-based public mobile communication network), and transmitting the MBMS data according to a predetermined time schedule.
  • the radio network controller performs radio resources on the MBMS bearer service. The allocation and control, and the transmission of MBMS data to the base station.
  • the base station is responsible for efficiently transmitting MBMS service data and control signaling over the air interface.
  • 3GPP defines the SAE/LTE specification.
  • SAE/LTE cancels the network element radio network controller (RNC).
  • the functionality of the RNC is spread across the evolved NodeB (eNode B) and core network. Compared with the pre-evolution network structure, the current SAE/LTE-based network structure is flatter.
  • the radio access network part is simplified by the original two network node structures (base station NodeB + radio network controller RNC) into a network node structure (enhanced base station eNodeB, hereinafter referred to as eNB).
  • eNB enhanced base station
  • eNodeB enhanced base station
  • eNB enhanced base station
  • eNodeB enhanced base station
  • eNB enhanced base station
  • eNodeB enhanced base station
  • eNB enhanced base station
  • eNodeB enhanced base station
  • eNB enhanced base station
  • eNB enhanced
  • An object of the present invention is to provide a system structure and method for supporting an evolved multimedia broadcast multicast service, which can support an evolved multimedia broadcast multicast service (EMBMS) in system architecture evolution, so that control signaling and service data of the EMBMS are valid. Ground to the eNBs.
  • EMBMS evolved multimedia broadcast multicast service
  • a system structure for supporting an evolved multimedia broadcast multicast service including: a broadcast multicast service center, configured to initiate control signaling and bearer services for multimedia broadcast multicast; a system architecture evolution gateway, configured to receive multimedia broadcast multicast service data and control signaling or service data from other networks, and forward the received service data and control signaling; and broadcast multicast management entity, for receiving and processing And forwarding control signaling of the multimedia broadcast multicast service, and determining, for each multimedia broadcast multicast service data, an enhanced base station that needs to receive the signaling; and a multicast user plane entity, configured to receive the multimedia broadcast multicast service data, and The received multimedia broadcast multicast service data is processed in the evolved packet system architecture evolution, and the processed multimedia broadcast multicast service data is forwarded to the downstream node.
  • a method for supporting a multimedia broadcast multicast service in a system architecture evolution includes the steps of: a broadcast multicast service center initiating a multimedia broadcast multicast bearer service, and forwarding the same to a system architecture evolution gateway, or The other network sends data to the system architecture evolution gateway; the system architecture evolution gateway (SAE GW) receives the multimedia broadcast multicast service data or the service data from other networks, and forwards the data to the multicast user plane entity; the multicast user plane entity receives After the multimedia broadcasts the multicast service data, the received multimedia broadcast multicast service data is processed by the core network in the evolved packet core network, and the processed multimedia broadcast multicast service data is sent to the downstream node.
  • SAE GW system architecture evolution gateway
  • a method for transmitting a multimedia broadcast multicast service in a system architecture evolution includes the following steps: the broadcast multicast service center initiates a multimedia broadcast multicast service session start message, and transmits a multimedia broadcast multicast service session start message to a corresponding system architecture evolution gateway; the system architecture evolved gateway receives the multimedia broadcast After the multicast service session start message, the received multimedia broadcast multicast service session start message is forwarded to the corresponding broadcast multicast management entity; the system architecture evolution gateway returns to the broadcast multicast service center to receive the multimedia broadcast multicast service session start message.
  • the response message is sent to confirm receipt of the message;
  • the broadcast multicast management entity receives the multimedia broadcast multicast service session start message forwarded by the system architecture evolution gateway, and forwards the received multimedia broadcast multicast service session start message to the multimedia Each enhanced base station connected to the broadcast multicast management entity in the broadcast multicast service service area;
  • the broadcast multicast management entity returns a response message to the system architecture evolution gateway that receives the multimedia broadcast multicast service start message Confirm receipt of this Information; reinforcing base station returns a response message received multimedia broadcast multicast service session start message to a broadcast multicast management entity, to confirm that the base station has received the enhanced multimedia broadcast multicast service session start message.
  • FIG. 2 is a schematic diagram showing a network topology of a Rel6 version of MBMS
  • FIG. 3 is a schematic diagram of an evolution of a system architecture supporting MBMS according to an embodiment of the present invention.
  • FIG. 4 is a flow diagram of a process for transmitting service data in support of MBMS system architecture evolution in accordance with an embodiment of the present invention. detailed description
  • FIG. 1 A schematic diagram of a system architecture supporting MBMS in an evolved packet system architecture evolution in accordance with an embodiment of the present invention is described below with reference to FIG.
  • thick lines indicate newly added functional components and interfaces.
  • the thin lines represent the functional elements and interfaces that are available in the prior art.
  • the architecture is centered on the mobile network, supporting mobility between fixed access and 3GFP.
  • this embodiment shows the structure of supporting evolved MBMS in an evolved packet core with a distributed user plane and control plane.
  • the system architecture of this embodiment includes a BM-SC (Broadcast Multicast Service Center) 41, a Serving SAE GW (Service System Architecture Evolution Gateway) 42, and a PDN SAE GW (Packet Data Network System Architecture Evolution Gateway).
  • BME Broadcast Multicast Management Entity
  • UE User Equipment
  • MME Mobility Management Entity
  • PCRF Policy and Charging Rules Function
  • HSS Home Subscriber
  • SGSN Serving Gateway Support Node
  • the support service SAE GW System Architecture Evolution Gateway
  • the PDN (Packet Data Network) SAE GW are located in the same physical node configuration, and the service SAE GW and the PDN SAE GW are located in different physical nodes. That is, the serving SAE GW and the PDN (Packet Data Network) SAE GW can be separate. In the present invention, for the sake of simplicity.
  • the service SAE GW and the PDN SAE GW are located on the same physical node as an example.
  • the BM-SC (Broadcast Multicast Service Center) 41 passes through the logical interfaces SGmb and SGi.
  • the logical interface SGmb may be an evolved interface for one of the Gmb interfaces of the Rel6 MBMS, and the SGi may be an evolved interface for one of the Gi interfaces of the Rel6 core network. It should be noted that the present invention is not limited thereto, and the logical interfaces SGmb and SGi may also be referred to as "reference points" as defined in the existing protocols.
  • the logical interfaces SGi and SGmb are reference points for the user plane and the control plane, respectively.
  • the 3GPP network and data packet network (PDN) are connected by reference point SGi. Compared to the network before the SAE/LTE version, the SGi combines the functions of both with the Gi and Wi reference points.
  • Gi supports 3GPP network access PDN
  • Wi supports non-3GPP network access PDN
  • the interface SGmb corresponds to the interface Gmb before the SAE/LTE version, and both are a reference point dedicated to the EMBMS service. Because the evolution of the network reduces the control signaling of the core network, compared with the interface Gmb, the interface SGmb can no longer need to support the user's subscription and user authentication and other signaling.
  • the logical interface Sz for connecting the BM-SC 41 and the carrier's IP service is used to support the MBMS bearer service, for example, IMS (IP Multimedia Subsystem) user service.
  • the BME 44 is connected to the serving SAE GW 42 via a logical interface S12.
  • the BME 44 is coupled to the enhanced base station (eNB) 45 via a logical interface S1JBME.
  • the logical functional entity for the branching of the MBMS proposed by the present invention is different from the logical functional entity in the unicast service, that is, the mobility management entity (MME) is used for the control plane, and the user plane entity (UPE) is used for User plane.
  • MME mobility management entity
  • UPE user plane entity
  • the control plane function related to the EMBMS is completed by the logical function entity of the branch, that is, the EMBMS Broadcast Multicast Management Entity (BME).
  • BME EMBMS Broadcast Multicast Management Entity
  • User plane functions related to EMBMS are implemented by a multicast user plane entity (mUPE).
  • the serving SAE GW 42 can be connected to the eNB 45 through an S1JJ interface.
  • the serving SAE GW 42 can be connected to the MME 47 and the SGSN 50 through the S11 interface and the S4 interface, respectively.
  • PDN The SAE GW 43 can connect to the operator's IP service through the SGi.
  • the FDN SAE GW 43 can be connected to the Policy and Charging Rules Function (PCRF) 48 via the S7 interface.
  • the PCRF 48 can be connected to the operator's IP service through the Rx interface.
  • the eNB 45 can be connected to the MME 47 via a logical interface S1-MME.
  • the MME 47 can be connected to the Serving Gateway Support Node (SGSN) 50 and the Home Subscriber Server (HSS) 49 via interfaces S3 and S6a, respectively.
  • the UE 46 can be connected to the eNB through LTE-Uu.
  • the GERAN network and the UTRAN network are connected to the SGSN through the Gb and Iu interfaces, respectively.
  • the Broadcast Multicast Service Center (BM-SC) 41 and the BM-SC in 3GPP Rd6 have the same functions.
  • the BM-SC 41 is the entry of the content provider for initiating the EMBMS bearer service, issuing an MBMS session start message, and transmitting the MBMS data according to a predetermined time schedule.
  • the BM-SC 41 transmits the EMBMS service content by broadcast or multicast as a starting point for providing services to the mobile terminal.
  • the signaling between the system architecture evolution gateway and the BM-SC 41 is exchanged through the logical interfaces SGmb and SGi. It should be noted that the BM-SC 41 can also send messages and data in other ways. In addition, the BM-SC 41 also ensures the security of the network.
  • the PDN SAE GW 43 receives MBMS service data and control signaling from the BM-SC 41 or service data and control signaling from other network devices, and stores the service parameters locally.
  • the PDN SAE GW 43 forwards the received service data to the serving SAE GW 42.
  • the service SAE GW 42 receives the multimedia broadcast multicast service data and control signaling, performs processing on the core network after receiving the service data and control signaling, and transmits the processed service data to the downstream node.
  • the System Architecture Evolution Gateway (SAE GW) also has EMBMS's distributed tree management capabilities. When there are multiple eNBs in the network, and multiple gateways, user data is sent down in a tree structure. In this case, the System Architecture Evolution Gateway (SAE GW) cooperates with the eNB 45 to select a specific route to allow user data to be sent down in a tree structure.
  • the packet data network system architecture evolution gateway receives multimedia broadcast multicast service data and control signaling from a broadcast multicast service center or other network, stores service parameters locally, and forwards the received service data to the service system architecture evolution gateway. Control signaling.
  • the BME 44 receives, processes, and forwards control signaling of the multimedia broadcast multicast service, for example, an MBMS session start message sent from the BM-SC, and other control signaling, for example, updating or stopping the MBMS session start message, etc., and Each MBMS service determines an enhanced base station that needs to receive these messages.
  • the BME 44 stores the context of the MBMS service and the mapping from the service area to the eNBs for each MBMS service.
  • BME 44 also features EMBMS distribution tree management.
  • the Broadcast Multicast Management Entity (BME) 44 may be implemented as a separate network element or in an MCE or MME.
  • the BME 44 can be a separate network element that acts as a control plane demarcation unit for the access network and the core network in the EMBMS architecture.
  • the BMC 44 can be implemented in the MME.
  • SFN single-frequency network
  • 3GPP specifically defines a multi-cell multicast coordination entity (MCE) for the radio resource allocation problem of EMBMS.
  • the MCE not only processes the control plane processing for the SFN operation of the EMBMS service, but also supports the processing of the control signaling (for example, the start of the MBMS session) of the EMBMS on the S1 interface.
  • the BME 44 can also be placed in the MCE implementation.
  • the number of BMEs depends on the carrier's configuration.
  • the SAE network is flatter than the Rel6 network.
  • a SAE GW can be connected to thousands of eNBs. If there is only one BME per SAE GW, the received MBMS session start message needs to be copied thousands of times, and then the copied MBMS session start message is transmitted to the corresponding eNBs. In this case, the workload of the BME is too heavy, and when several MBMS session start messages are simultaneously performed, the situation is even worse.
  • multiple BMEs 44 can be placed in an area controlled by one SAE GW. For example, in the case of a broadcast service, one BME can be placed in each of the largest SFN areas according to the static configuration of the operator.
  • the multicast user plane entity (mUPE) in the serving SAE GW 42 receives the MBMS service data sent by the BM-SC 41 and processes it in the evolved packet system architecture evolution. In addition, the multicast user plane entity also allocates the received MBMS service data to the downstream node. For each service SAE GW, there is only one multicast user plane entity per MBMS service.
  • the mobility management entity/multicast user plane entity acts as a mobile entity in the access network
  • the PDN SAE GW acts as a functional entity in the network, and effective mapping between the two needs to be performed.
  • FMC fixed-line mobile convergence
  • FIG. 4 is a flow chart showing the transfer of service data in a system architecture evolution supporting MBMS in accordance with an embodiment of the present invention.
  • step S601 the BM-SC 41 initiates an MBMS session start message and transmits an MBMS session start message to a corresponding system architecture evolution side gateway (SAE GW).
  • SAE GW system architecture evolution side gateway
  • the MBMS session start message carries attributes related to the message and Parameters, such as the ID, QoS, service area, and other parameters of the service.
  • step S602 after receiving the MBMS live start message, the SAE GW stores the parameters contained therein locally, and forwards the MBMS session start message to the corresponding EMC 44.
  • step S603 the SAE GW returns to the BM-SC to receive the A response message to the MBMS Session Start message to confirm receipt of the message.
  • step S604 the BME 44 receives the MBMS session start message forwarded by the SAE GW, stores the parameters included in the message, and forwards the received MBMS message to the BME 44 in the MBMS service area. Each eNB connected.
  • step S605 the BME 44 returns a response message to the SAE GW that the MBMS Session Start message is received to confirm receipt of the message.
  • the BME 44 may return a response to the SAE GW that the BME has received the MBMS Session Start message before receiving a response from the eNBs that the eNBs have received the MBMS Session Start message. Message.
  • the present invention does not impose a requirement on the time limit for the EMC to return a response message to the SAE GW, and may also return a response message to the SAE GW after the BME 44 receives the response message from the eNBs.
  • the eNB returns a response message to the EMC that the MBMS session start message is received to confirm that the eNB has received the MBMS start message.
  • the multimedia broadcast multicast service session is started by the broadcast multicast management entity. It should be noted that the broadcast multicast management entity may also perform signaling of other control planes, such as updating or ending a multimedia broadcast multicast service session.
  • a device that performs a corresponding logical function is referred to as a "entity.” It should be noted that these entity meanings may include elements, devices, or devices that perform the corresponding functions, and other terms that have similar meanings.
  • these functions described above can be implemented by hardware. However, the present invention is not limited thereto, and these functions can also be implemented by software using a computer.
  • a structural system for supporting MBMS service data in a 3GPP system architecture evolution and a method for transmitting MBMS control signaling and service data using the architecture to efficiently reach an eNB.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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  • Mobile Radio Communication Systems (AREA)
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Description

在系统架构演进中支持多媒体广播组播业务的方法和装
技术领域
本发明涉及一种在无线通信系统的核心网中支持演进多媒体广播组播业务
(EMBMS: Evolved Multimedia Broadcast/Multicast Semce) 的架构体系， 特别是， 涉 及在 3GPP (第三代合作伙伴计划） 的系统架构演迸 /长期演进 （SAE/LTE) 中支持 EMB S的核心网架构和使用该架构的方法。 背景技术
3GPP在 2005年启动了长期演进研究项目 （LTE: Long Term Evolution), 希望以 更高的数据吞吐量和更好的网络性能， 为运营商和用户不断增长的需求提供支持。
多媒体广播组播业务 （MBMS) 是 3GPP REL6引入的一项业务， 是指一个数据 源向多个用户发送数据的点到多点业务， 从而实现网络 （包括核心网和接入网） 资源 共享， 以尽可能少的资源实现对尽可能多的、 具有相同需求的多媒体用户的服务。 在 无线接入网， MBMS业务通过使用公共传输信道和公共无线承载， 既能实现纯文本低 速率的消息类组播和广播， 也能实现较高速率的多媒体业务的组播和广播， 例如， 手 机电视。
图 1示意性地示出了移动通信网络， 作为 WCDMA系统的示例。 如图 1所示， 移动通信网络中的多个基站 （NodeB) 11 , 】2， 13等连接到基站控制器 （RNC) 10。 一个无线网络控制器 10管理若千基站， NodeB和 RNC通过有线传输连接， 两者之间 的接口定义为 Iub接口。 RNC 10还可以通过 Iu接口与系统架构演进网（CN)的 SGSN 设备相连。 。
图 2是 3GPP Rel6版本的 MBMS网络结构的示意图。 支持 MBMS的网元主要包 括： BM-SC (广播组播业务中心）、 GGSN (GPRS网关支持节点）、 SGSN (服务网关 支持节点）、 接入网 （UTRAN) 包括基站 （NodeB) 和无线网络控制器 （KNC)、 UE (用户设备）。 BM-SC是内容提供者的入口， 用于授权和在 PLMN (陆上公用移动通 信网〉 中发起 MBMS承载业务， 并按照预定时间计划传送 MBMS数据。 无线网络控 制器对 MBMS承载业务进行无线资源的分配和控制， 并将 MBMS数据通过传送到基 站。 基站负责通过空中接口高效地传送 MBMS业务数据和控制信令。 从 REL7版本幵始， 3GPP定义了 SAE/LTE的规范， 为了简化网络架构和降低时 延， SAE/LTE取消了网元无线网络控制器（RNC)。RNC的功能被分散到演进的 NodeB (eNode B ) 和核心网中。 与演进前的网络结构相比， 目前基于 SAE/LTE的网络结构 更加平坦。 无线接入网部分由原有的两个网络节点结构 （基站 NodeB +无线网络控制 器 RNC)简化成一个网络节点结构（增强基站 eNodeB ,以下简写作 eNB )。在 SAE/LTE 的网络结构中， MBMS被称为 EMBMS (Evolved-MBM& 演进多媒体广播组播业务）。
但是在目前的规范中， 在系统架构演进网方面， 只有支持单播业务的架构体系， 而没有提出在系统架构演进网中支持 MBMS 的系统架构。 @此， 需要在系统架构演 进中实现支持 MBMS的系统架构演进网实体。 发明内容
本发明的目的是提供一种支持演进的多媒体广播组播业务的系统结构和方法， 能 够在系统架构演进中支持演进的多媒体广播组播业务（EMBMS ) , 使得 EMBMS的控 制信令和业务数据有效地到达 eNBs。
为了实现本发明， 根据本发明的一个方面， 提供一种支持演进的多媒体广播组播 业务的系统结构， 包括： 广播组播服务中心， 用于发起多媒体广播组播的控制信令和 承载业务； 系统架构演进网关， 用于接收多媒体广播组播业务数据和控制信令或来自 其它网络的业务数据， 并转发所接收到的业务数据和控制信令； 广播组播管理实体， 用于接收、 处理和转发多媒体广播组播业务的控制信令， 并针对每项多媒体广播组播 业务数据确定需要接收这些信令的增强基站； 和组播用户平面实体， 用于接收多媒体 广播组播业务数据， 并在演进的分组系统架构演进中处理接收的多媒体广播组播业务 数据， 向下游节点转发处理后的多媒体广播组播业务数据。
根据本发明的另一个方面， 提供一种在系统架构演进中支持多媒体广播组播业务 的方法， 包括步骤： 广播组播服务中心发起多媒体广播组播承载业务， 并转发给系统 架构演进网关， 或其他网络发送数据到系统架构演进网关； 系统架构演进网关 （SAE GW) 接收到多媒体广播组播业务数据或来自其它网络的业务数据后， 转发给组播用 户平面实体； 组播用户平面实体接收到多媒体广播组播业务数据后， 在演进的分组核 心网中对接收到的多媒体广播组播业务数据进行核心网的处理， 并向下游节点发送处 理后的多媒体广播组播业务数据。
根据本发明的再一个方面， 提供一种在系统架构演进中传送多媒体广播组播业务 的方法， 包括歩骤： 广播组播服务中心发起多媒体广播组播业务会话开始消息， 并将 多媒体广播组播业务会话幵始消息传送到对应的系统架构演进网关； 系统架构演进网 关接收到多媒体广播组播业务会话开始消息后， 将接收的多媒体广播组播 务会话开 始消息转发到对应的广播组播管理实体； 系统架构演进网关向广播组播服务中心返回 接收到多媒体广播组播业务会话开始消息的响应消息， 以确认接收到该消息； 广播组 播管理实体接收系统架构演进网关所转发的多媒体广播组播业务会话幵始消息， 并将 接收的多媒体广播组播业务会话开始消息转发到处在多媒体广播组播业务服务区中 的、 与广播组播管理实体连接的每个增强基站； 广播组播管理实体向系统架构演进网 关返回接收到多媒体广播组播业务会 i舌开始消息的响应信息， 以确认接收到该消息； 增强基站向广播组播管理实体返回接收到多媒体广播组播业务会话开始消息的响应 消息， 以确认该增强基站已经接收到多媒体广播组播业务会话开始消息。 附图说明
通过下面结合附图说明本发明的优选实施例， 将使本发明的上述及其它目的、特 征和优点更加清楚， 其中- 图 1是表示 WCDMA的无线接入网的系统结构的示意图；
图 2是表示 Rel6版本的 MBMS的网络拓扑结构的示意图；
图 3是根据本发明实施例支持 MBMS的系统架构演进的示意图； 和
图 4是根据本发明实施例在支持 MBMS系统架构演进中传送业务数据的过程的 流程图。 具体实施方式
下面参照附图对本发明的优选实施例进行详细说明， 在描述过程中省略了对于本 发明来说是不必要的细节和功能， 以防止对本发明的理解造成混淆。
下面参考图 3 描述根据本发明实施例在演进的分组系统架构演进中支持 MBMS 的系统架构的示意图。
在图 3中， 粗线表示新加入的功能元件和接口。 细线表示现有技术中已有的功能 元件和接口。 该架构以移动网络为中心， 从而支持固定接入和 3GFP之间的移动性。
如图 3所示， 该实施例给出了以分幵的用户平面和控制平面在演进的分组核心中 支持演进的 MBMS的结构。 如图 3所示， 本实施例的系统架构中包括 BM-SC (广播组播业务中心） 41， 服务 SAE GW (服务系统架构演进网关） 42， PDN SAE GW (分组数据网系统架构演进网 关） 43， 广播组播管理实体 （BME) 44, eNB (增强基站） 45， 用户设备 （UE) 46， 移动性管理实体 （MME) 47， PCRF (策略和计费规则功能） 48, HSS (归属用户 服务器） 49， SGSN (服务网关支持节点） 50, 和运营商的 IP业务。
根据本发明，支持服务 SAE GW (系统架构演进网关）和 PDN (分组数据网） SAE GW位于同一个物理节点的配置， 和服务 SAE GW与 PDN SAE GW位于不同物理节 点的配置。 就是说， 服务 SAE GW和 PDN (分组数据网） SAE GW可以是分开的。 在本发明中， 为了简化起见。 以服务 SAE GW与 PDN SAE GW位于同一个物理节点 为例进行描述。
在本实施例中， BM-SC (广播组播业务中心） 41通过逻辑接口 SGmb和 SGi与
SAE GW相连。 逻辑接口 SGmb可以是用于 Rel6 MBMS的 Gmb接口之一的演进接 口， SGi可以是用于 Rel6核心网络的 Gi接口之一的演进接口。 应该指出， 本发明不 限于此， 逻辑接口 SGmb和 SGi也可以像现有协议中定义的那样称之为"参考点"。 逻 辑接口 SGi和 SGmb分别是用户平面和控制平面的参考点。 3GPP网络和数据分组网 (PDN) 通过参考点 SGi相连。 SGi和 SAE/LTE版本之前的网络相比， 对应于 Gi和 Wi参考点，合并了两者的功能。其中 Gi支持 3GPP网络接入 PDN，而 Wi支持非 3GPP 网络接入 PDN。 另夕卜， 接口 SGmb和 SAE/LTE版本之前的接口 Gmb相对应， 两者是 EMBMS业务专用的一个参考点。 因为网络的演进减少了核心网的控制信令， 与接口 Gmb相比， 接口 SGmb可以不再需要支持用户的订阅以及用户的认证等信令。
连接 BM-SC 41和运营商 IP业务的逻辑接口 Sx用于通过 MBMS承载业务来支持 , 例如， IMS (IP多媒体子系统）用户业务。 BME 44通过逻辑接口 S12与服务 SAE GW 42相连。 另外， BME 44通过逻辑接口 S1JBME与增强基站 （eNB ) 45相连。
本发明提出的用于 MBMS的分幵的逻辑功能实体与单播（unicast)业务中的逻辑 功能实体不同， 即移动性管理实体 （MME) 用于控制平面， 而用户平面实体 （UPE) 用于用户平面。 在本实施例中， 由分幵的逻辑功能实体， 即 EMBMS广播组播管理实 体 （BME) 来完成与 EMBMS有关的控制平面功能。 由组播用户平面实体 （mUPE) 来实施与 EMBMS有关的用户平面功能。
另夕卜， 如图 5所示， 服务 SAE GW 42可以通过 S1JJ接口与 eNB 45相连。此外， 服务 SAE GW 42可以通过 S11接口和 S4接口分别与 MME 47和 SGSN 50相连。PDN SAE GW 43可以通过 SGi与运营商的 IP业务连接。 FDN SAE GW 43可以通过 S7接 口与策略和计费规则功能 （PCRF) 48相连。 PCRF 48可以通过 Rx接口与运营商的 IP业务相连。 eNB 45可以经过逻辑接口 S1—MME与 MME 47相连。 MME 47可以经 过接口 S3和 S6a分别与服务网关支持节点 （SGSN) 50和归属用户服务器（HSS ) 49 相连。 UE 46可以通过 LTE—Uu与 eNB相连。 此外， GERAN网和 UTRAN网分别通 过 Gb和 Iu接口与 SGSN相连。
广播组播服务中心 （BM-SC) 41和 3GPP Rd6中的 BM-SC的功能相同。 BM-SC 41是内容提供者的入口， 用于发起 EMBMS承载业务， 发出 MBMS会话幵始消息， 并按照预定时间计划传送 MBMS数据。 BM-SC 41将 EMBMS业务内容通过广播或组 播方式发送， 作为向移动终端提供服务的起点。 系统架构演进网关与 BM-SC 41之间 的信令通过逻辑接口 SGmb和 SGi进行交换。 应该指出， BM-SC 41也可以逋过其它 方式发出消息和数据。 另外， BM-SC 41还要确保网络的安全性。
PDN SAE GW 43接收来自 BM-SC 41的 MBMS业务数据和控制信令或来自其它 网络设备的业务数据和控制信令， 并在本地存储业务参数。 PDN SAE GW 43向服务 SAE GW42转发收到的这些业务数据。 服务 SAE GW 42接收多媒体广播组播业务数 据和控制信令， 接收到业务数据和控制信令后对数据进行核心网的处理， 并向下游节 点发送处理后的业务数据。 系统架构演进网关 （SAE GW) 还具有 EMBMS的分布树 管理功能。 当网络中存在多个 eNB， 和多个网关时， 用户数据以树状结构向下发送。 这种情况下， 系统架构演进网关（SAE GW)与 eNB 45配合， 选择特定的路由使用户 数据以树状的结构向下发送。
另外， 分组数据网系统架构演进网关从广播组播服务中心或其他网络接收多媒体 广播组播业务数据和控制信令， 在本地存储业务参数， 和向服务系统架构演进网关转 发接收到的业务数据和控制信令。
BME 44接收、 处理和转发多媒体广播组播业务的控制信令， 例如， 从 BM-SC发 出的 MBMS会话幵始消息， 以及其它控制信令， 例如， 更新或停止 MBMS会话开始 消息等， 并针对每项 MBMS业务确定需要接收这些消息的增强基站。 另外， BME 44 存储 MBMS业务的上下文， 以及针对每项 MBMS业务存储从服务区到 eNBs的映射 关系。 此外， BME 44还具有 EMBMS分布树管理功能。
应该指出， 广播组播管理实体 （BME) 44 可以以单独的网元来实现也可以放在 MCE或 MME中。 BME 44可以是单独的网络单元， 作为 EMBMS架构中接入网和核心网的控制面 分界单元。 另外， 如果今后的网络演进支持增强 MME， 即 MME不仅支持已定义的 单播业务， 也同时支持 EMBMS业务， 可以将 BMC 44放置在 MME中实现。 另外， 针对单频网络 （SFN) 的操作， 3GPP为 EMBMS的无线资源分配问题专门定义了一 个多小区组播协调实体（MCE)。 同样， 如果今后的网络演进增强了 MCE的功能， 即 MCE不仅处理 EMBMS业务的针对 SFN操作的控制面处理，也同时支持 EMBMS 在 S 1接口上的控制信令（例如， MBMS会话开始） 的处理， MBMS承载的建立和释放， 以及其他所需的控制平面功能的情况下， BME 44也可以放置在 MCE实现。
在演进的分组核心中， BME的数量取决于运营商的配置。 SAE网络比 Rel6网络 更平坦。一个 SAE GW可以与数千个 eNBs相连。如果每个 SAE GW只有一个 BME， 则需要将所接收的 MBMS会话幵始消息复制数千次， 然后将复制的 MBMS会话开始 消息传送到对应的 eNBs。这种情况下， BME的工作负荷太重， 当数个 MBMS会话开 始消息同时进行时， 其状况更差。 为了避免 MBMS会话开始消息传送中的这一潜在 问题， 可以在由一个 SAE GW控制的区域中设置多个 BME44。 例如， 在广播业务的 情况下， 根据运营商的静态配置， 每个最大的 SFN区域中可以放置一个 BME。
服务 SAE GW 42中的组播用户平面实体（mUPE)接收 BM-SC 41发出的 MBMS 业务数据， 并在演进的分组系统架构演进中进行处理。 另外， 组播用户平面实体还向 下游节点分配接收的 MBMS业务数据。 对于每个服务 SAE GW, 每项 MBMS业务只 有一个组播用户平面实体。
在移动终端漫游的情况下， 移动性管理实体 /组播用户平面实体 （MME UPE) 作 为访问网络中的移动实体， 而 PDN SAE GW作为网络中的功能实体， 两者之间需要 进行有效的映射， 以实现固网移动融合 （FMC ) 控制。
图 4示出了根据本发明实施例在支持 MBMS的系统架构演进中传送业务数据的 流程图。
参考图 4， 以传送 MBMS会话开始消息为例描述在系统架构演进传送 MBMS业 务的过程。 首先， 在步骤 S601， BM-SC 41发起 MBMS会话幵始消息， 并将 MBMS 会话开始消息传送到对应的系统架构演进侧网关 （SAE GW) o MBMS会话幵始消息 携带有关于该消息的属性和参数，例如，业务的 ID、QoS、服务区等参数。在步骤 S602, SAE GW接收到 MBMS会活开始消息后，将其中包含的参数存储在本地，将该 MBMS 会话幵始消息转发到对应的 EMC 44。 在步骤 S603 , SAE GW向 BM-SC返回接收到 MBMS会话开始消息的响应消息， 以确认接收到该消息。
此后， 在歩骤 S604， BME 44接收 SAE GW所转发的 MBMS会话开始消息， 存 储该消息中包含的参数， 并将接收的 MBMS会 i舌开始消息转发到处在 MBMS服务区 中的、 与 BME 44连接的每个 eNB。 接下来， 在步骤 S605 , BME 44向 SAE GW返回 接收到 MBMS会话开始消息的响应信息，以确认接收到该消息。根据本发明， BME 44 在向 SAE GW返回接收响应消息时， 可以在未从 eNBs接收到有关 eNBs已经接收到 该 MBMS会话开始消息的响应之前向 SAE GW返回 BME已接收到 MBMS会话开始 消息的响应消息。 应该指出， 本发明对 EMC向 SAE GW返回响应消息的时限没有强 制要求， 也可以在 BME 44从 eNBs接收到响应消息后再向 SAE GW返回响应消息。 最后， 在歩骤 S606， eNB向 EMC返回接收到 MBMS会话开始消息的响应消息， 以 确认 eNB已经接收到 MBMS会¾幵始消息。
需要说明的是， 上面以所述广播组播管理实体对多媒体广播组播业务会话进行开 始进行了描述。 应该指出， 广播组播管理实体也可以执行其它控制面的信令， 例如更 新或结束多媒体广播组播业务会话等。
在上面的描述中， 将执行相应逻辑功能的装置称为"实体"。 应该指出， 这些实体 含义可以包含执行相应功能的单元， 装置， 或设备， 以及其它具有类似含义的术语。 另外， 这些上面所述的功能可以通过硬件来实施。 然而， 本发明不限于此， 这些功能 也可以利用计算机通过软件来实施。
根据本发明， 提供了在 3GPP系统架构演进中支持 MBMS业务数据的结构体系， 以及采用该架构传送 MBMS控制信令和业务数据， 使其有效地到达 eNB的方法。 至此已经结合优选实施例对本发明进行了描述。应该理解，本领域技术人员在不 脱离本发明的精神和范围的情况下， 可以进行各种其它的改变、 替换和添加。 因此， 本发明的范围不局限于上述特定实施例， 而应由所附权利要求所限定。

Claims

权 利 要 求
1.一种支持演进的多媒体广播组播业务的系统结构， 包括- 广播组播服务中心， 用于发起多媒体广播组播的控制信令和承载业务； 系统架构演进网关（SAE GW)， 用于接收多媒体广播组播业务数据和控制信令或 来自其它网络的业务数据， 并转发所接收到的业务数据和控制信令；
广播组播管理实体 （BME) , 用于接收、 处理和转发多媒体广播组播业务的控制 信令， 并针对每项多媒体广播组播业务数据确定需要接收这些信令的增强基站； 和 组播用户平面实体（mUPE)， 用于接收多媒体广播组播业务数据， 并在演进的分 组系统架构演进中处理接收的多媒体广播组播业务数据， 向下游节点转发处理后的多 媒体广播组播业务数据。
2.根据权利要求 1所述的系统结构， 其中所述系统架构演进网关包括： 分组数据网系统架构演进网关， 用于从广播组播服务中心或其他网络接收多媒体 广播组播业务数据和控制信令， 在本地存储业务参数， 和向服务系统架构演进网关转 发接收到的业务数据和控制信令；
服务系统架构演进网关， 用于从分组数据网系统架构演进网关接收多媒体广播组 播业务数据和控制信令， 在本地存储业务参数， 和向下游节点转发接收到的业务数据 和控制信令。
3.根据权利要求 2所述的系统结构， 其中所述服务系统架构演进网关和所述分组 数据网系统架构演进网关位于同一个物理节点。
4.根据权利要求 2所述的系统结构， 其中所述服务系统架构演进网关和所述分组 数据网系统架构演进网关位于不同的物理节点。
5.根据权利要求所述 2所述的系统结构， 其中所述服务系统架构演进网关具有对 要转发的多媒体广播组播业务进行分布树管理的功能。
6.根据权利要求所述 2所述的系统结构， 其中所述服务系统架构演进网关在本地 存储所转发的控制信令中所包含的参数。
7.根据权利要求所述 1所述的系统结构， 其中所述广播组播管理实体存储所转发 的控制信令中所包含的参数。
8.根据权利要求所述 1所述的系统结构， 其中所述广播组播管理实体具有对要转 发的多媒体广播组播业务进行分布树管理的功能。
9.根据权利要求所述 1所述的系统结构， 其中所述广播组播管理实体是演进的多 媒体广播组播业务的管理实体。
10.根据权利要求所述 1所述的系统结构， 其中所述广播组播管理实体（BME)可 以以单独的网元来实现， 也可以设置在组播协调实体 （MCE ) 或移动性管理实体
(MME) 中。
11.根据权利要求所述 1所述的系统结构，其中所述广播组播管理实体通过接口分 别与服务系统架构演进网关和节点 （eNB) 相连。
12.根据权利要求所述 1至 11中的任何一项所述的系统结构， 其中所述多媒体广 播组播业务是演进的多媒体广播组播业务。
13.—种在系统架构演进中支持多媒体广播组播业务的方法， 包括步骤： 广播组播服务中心发起多媒体广播组播承载业务， 并转发给系统架构演进网关， 或其他网络发送数据到系统架构演进网关；
系统架构演进网关 （SAE GW) 接收到多媒体广播组播业务数据或来自其它网络 的业务数据后， 转发给组播用户平面实体；
组播用户平面实体接收到多媒体广播组播业务数据后， 在演进的分组核心网中对 接收到的多媒体广播组播业务数据进行核心网的处理， 并向下游节点发送处理后的多 媒体广播组播业务数据。
14.根据权利要求 13所述的方法， 进一步包括所述服务系统架构演进网关对要转 发的多媒体广播组播业务进行分布树管理的步骤。
15.根据权利要求 13所述的方法， 进一步包括所述广播组播管理实体对要转发的 多媒体广播组播业务进行分布树管理的步骤。
16.根据权利要求所述 13至 15中的任何一项所述的方法，其中所述多媒体广播组 播业务是演进的多媒体广播组播业务。
17.—种在系统架构演进中传送多媒体广播组播业务的方法， 包括歩骤- 广播组播服务中心发起多媒体广播组播业务会话幵始消息， 并将多媒体广播组播 业务会话开始消息传送到对应的系统架构演进网关；
系统架构演进网关接收到多媒体广播组播业务会话开始消息后， 将接收的多媒体 广播组播业务会话开始消息转发到对应的广播组播管理实体；
系统架构演进网关向广播组播服务中心返回接收到多媒体广播组播业务会话开 始消息的响应消息， 以确认接收到该消息；
广播组播管理实体接收系统架构演进网关所转发的多媒体广播组播业务会话幵 始消息， 并将接收的多媒体广播组播业务会话开始消息转发到处在多媒体广播组播业 务服务区中的、 与广播组播管理实体连接的每个增强基站；
广播组播管理实体向系统架构演进网关返回接收到多媒体广播组播业务会话开 始消息的响应信息， 以确认接收到该消息；
增强基站向广播组播管理实体返回接收到多媒体广播组播业务会话幵始消息的 响应消息， 以确认该增强基站已经接收到多媒体广播组播业务会话开始消息。
18.根据权利要求 17所述的方法， 进一步包括所述系统 ^5构演进网关在本地存储 多媒体广播组播业务会话开始消息中包含的参数的步骤。
19.根据权利要求 17所述的方法， 进一步包括所述广播组播管理实体存储多媒体 广播组播业务会话开始消息中包含的参数的步骤。
20.根据权利要求 17所述的方法， 其中所述广播组播管理实体能够对多媒体广播 组播业务会话进行更新， 和结束。
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