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CN101111068A - Communication method between mobile terminal and access gateway - Google Patents

Communication method between mobile terminal and access gateway Download PDF

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CN101111068A
CN101111068A CNA2006101071601A CN200610107160A CN101111068A CN 101111068 A CN101111068 A CN 101111068A CN A2006101071601 A CNA2006101071601 A CN A2006101071601A CN 200610107160 A CN200610107160 A CN 200610107160A CN 101111068 A CN101111068 A CN 101111068A
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mobile terminal
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刘继兴
王洁
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Huawei Technologies Co Ltd
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Abstract

本发明公开了一种移动终端与接入网关的通信方法,包括:移动终端与接入网关通信时,消息的目的地址设置为接入网关可识别的专用地址,接入网关根据该专用地址获知该消息是移动终端与接入网关之间的信令,并进行相应处理。本发明使得目标接入网关能够正常处理自身与移动终端的信令。

Figure 200610107160

The invention discloses a communication method between a mobile terminal and an access gateway, comprising: when the mobile terminal communicates with the access gateway, the destination address of the message is set as a special address recognizable by the access gateway; The message is signaling between the mobile terminal and the access gateway, and corresponding processing is performed. The invention enables the target access gateway to normally process the signaling between itself and the mobile terminal.

Figure 200610107160

Description

移动终端与接入网关的通信方法 Communication method between mobile terminal and access gateway

技术领域technical field

本发明涉及业务的移动性管理领域,特别是一种移动终端与接入网关的通信方法。The invention relates to the field of service mobility management, in particular to a communication method between a mobile terminal and an access gateway.

背景技术Background technique

CDMA2000系统包括CDMA 1x网络和高速分组数据(HRPD)网络,能提供高达153.6kbps的数据速率,支持视频点播(VOD)、网上游戏、高速数据下载等分组数据业务。在CDMA2000系统中,有效地进行业务移动性管理是非常重要的,业务的移动性管理的目的之一是在移动终端发生位置变迁时保证业务的连续性。The CDMA2000 system includes a CDMA 1x network and a high-speed packet data (HRPD) network, which can provide data rates up to 153.6kbps and support packet data services such as video on demand (VOD), online games, and high-speed data downloads. In the CDMA2000 system, it is very important to effectively manage service mobility. One of the purposes of service mobility management is to ensure service continuity when the location of the mobile terminal changes.

CDMA2000系统的分组域结构图如图1所示,图中实线是承载数据的传输通路,虚线是信令的传输通路。分组数据服务节点(PDSN)通过点对点协议(PPP)将移动终端接入IP网络,同时为分组数据包提供下一跳的路由,并通过IP控制协议(IPCP)为移动终端分配IP地址。The structure diagram of the packet domain of the CDMA2000 system is shown in Figure 1. The solid line in the figure is the transmission path for carrying data, and the dotted line is the transmission path for signaling. Packet Data Serving Node (PDSN) connects mobile terminals to IP network through Point-to-Point Protocol (PPP), provides next-hop routing for packet data packets, and assigns IP addresses to mobile terminals through IP Control Protocol (IPCP).

在CDMA2000系统中,如果在连接相同的PDSN的接入网(AN)之间发生切换,即切换前后的服务PDSN是同一PDSN,则这种切换被称为PDSN内切换;如果在连接不同PDSN的AN之间发生切换,即切换前后的服务PDSN不是同一PDSN,这种切换被称为PDSN间切换。对于PDSN内切换,由于没有改变接入点,不涉及IP地址的改变,所以仅需要进行链路切换即可维持业务的连续性。而对于PDSN间切换,接入点发生了改变,此时无法通过简单的链路切换来维持业务的连续性,需要以其它方式来维持业务的连续性。In the CDMA2000 system, if a handover occurs between access networks (AN) connected to the same PDSN, that is, the serving PDSN before and after the handover is the same PDSN, then this handover is called an intra-PDSN handover; Handover occurs between ANs, that is, the serving PDSN before and after the handover is not the same PDSN, and this handover is called inter-PDSN handover. For intra-PDSN handover, since no access point is changed and no change of IP address is involved, only link handover is required to maintain service continuity. As for inter-PDSN handover, the access point has changed. At this time, the continuity of the service cannot be maintained through simple link switching, and the continuity of the service needs to be maintained in other ways.

在CDMA 1x系统中,在终端移动到另一个PDSN的覆盖范围导致PDSN间切换时,通过两个PDSN间的层二隧道进行数据的转发,使得PPP端点维持在源PDSN而不改变接入点,可以维持终端的地址不变,从而保持业务的连续性。In the CDMA 1x system, when the terminal moves to the coverage area of another PDSN and causes handover between PDSNs, the data is forwarded through the layer 2 tunnel between the two PDSNs, so that the PPP endpoint remains at the source PDSN without changing the access point. The address of the terminal can be kept unchanged, so as to maintain the continuity of the business.

但是,如果PPP端点维持在源PDSN而不改变,会导致在活动分组会话期间,A10连接和PDSN-PDSN(P-P)间连接同时存在,从而增加了源PDSN的负担,消耗了源PDSN的处理资源和PDSN间的链路资源。所以在HRPD网络的PDSN间切换过程中,会将源PDSN的会话状态转移到切换后的目标PDSN上来,使得移动终端的网络接入点变成目标PDSN,其切换流程具体包括:However, if the PPP endpoint remains unchanged at the source PDSN, it will cause A10 connection and PDSN-PDSN (P-P) connection to exist simultaneously during the active packet session, thereby increasing the burden on the source PDSN and consuming the processing resources of the source PDSN Link resource between PDSN and PDSN. Therefore, during the inter-PDSN handover process of the HRPD network, the session state of the source PDSN will be transferred to the target PDSN after handover, so that the network access point of the mobile terminal becomes the target PDSN. The handover process specifically includes:

1)移动终端进行PDSN间切换,建立目标接入网到目标PDSN间的A10连接;1) The mobile terminal performs inter-PDSN handover, and establishes an A10 connection between the target access network and the target PDSN;

2)目标PDSN建立到源PDSN的P-P连接,源PDSN将该移动终端的点到点协议(PPP)状态、服务质量参数、移动性状态等会话上下文信息传输给目标PDSN,目标PDSN建立该终端的会话状态;2) The target PDSN establishes a P-P connection to the source PDSN, the source PDSN transmits session context information such as the point-to-point protocol (PPP) status, service quality parameters, and mobility status of the mobile terminal to the target PDSN, and the target PDSN establishes the terminal's session state;

3)源PDSN通过P-P连接向目标PDSN发送数据,目标PDSN将数据转发到目标接入网,相应的会话管理和数据处理都在目标PDSN进行,移动终端的IP地址维持不变;3) The source PDSN sends data to the target PDSN through the P-P connection, and the target PDSN forwards the data to the target access network, and the corresponding session management and data processing are performed in the target PDSN, and the IP address of the mobile terminal remains unchanged;

4)源PDSN释放与源接入网之间的A10连接。4) The source PDSN releases the A10 connection with the source access network.

此外,目标PDSN在移动终端发生PDSN间切换后,还可使用代理移动IP信令向家乡代理(HA)进行注册登记,将移动终端的IP地址与目标PDSN的地址进行绑定,此时,HA不会再将外部来的分组数据发送给源PDSN。当移动终端休眠或者重新协商会话时,或者目标PDSN执行了通过代理移动IP向HA进行注册后,目标PDSN释放其到源PDSN的P-P连接。In addition, after the mobile terminal switches between PDSNs, the target PDSN can also use proxy mobile IP signaling to register with the home agent (HA), and bind the IP address of the mobile terminal with the address of the target PDSN. At this time, the HA No further packet data from outside will be sent to the source PDSN. When the mobile terminal sleeps or renegotiates the session, or after the target PDSN registers with the HA through the proxy mobile IP, the target PDSN releases its P-P connection to the source PDSN.

目前,第三代伙伴计划2(3GPP2)标准组织正在进行网络演进项目的研究,其主要的目的就是增强分组交换能力、简化网络结构、提高QoS、减少时延、提高用户数据率、提高系统容量和覆盖率、减少运营成本等,使得演进后的分组网络能够更加有效的提供对实时业务和非实时业务的承载,为用户提供更加丰富的业务。At present, the 3rd Generation Partnership Project 2 (3GPP2) standard organization is conducting research on network evolution projects. Its main purpose is to enhance packet switching capabilities, simplify network structure, improve QoS, reduce delay, increase user data rate, and increase system capacity. and coverage, reduce operating costs, etc., so that the evolved packet network can more effectively provide real-time services and non-real-time services, and provide users with more abundant services.

演进网络的结构如图2所示,其中,控制接入点(CAP)具有接入网关(AGW)和无线资源管理的功能。接入网关的主要功能是作为移动终端的第一跳路由器,以及移动性管理、QoS支持等部分原PDSN的功能。而无线资源管理包括公用资源管理、专用资源管理、无线会话管理、维护移动终端的会话状态、无线链路管理等。网络移动性代理(NMA)提供CAP之间层三(L3)移动性管理机制,不需要空口的移动IP信令。The structure of the evolved network is shown in Fig. 2, wherein the control access point (CAP) has functions of access gateway (AGW) and radio resource management. The main function of the access gateway is to serve as the first hop router of the mobile terminal, as well as some functions of the original PDSN such as mobility management and QoS support. The wireless resource management includes public resource management, dedicated resource management, wireless session management, maintaining the session state of the mobile terminal, and wireless link management. The Network Mobility Agent (NMA) provides a Layer 3 (L3) mobility management mechanism between CAPs and does not require mobile IP signaling over the air interface.

移动终端在接入演进网络时,通过CAP获得的地址在整个NMA的范围内有效,CAP将移动终端的地址和CAP本身的地址在NMA进行注册绑定,以使数据能正确路由。所以在进行CAP之间切换的时候,不需要更换地址。注册绑定后,NMA接到的移动终端的分组数据将向目标CAP发送,再由目标CAP转发到移动终端。其切换流程具体为:When the mobile terminal accesses the evolved network, the address obtained through the CAP is valid within the scope of the entire NMA, and the CAP registers and binds the address of the mobile terminal with the address of the CAP itself in the NMA so that data can be routed correctly. Therefore, when switching between CAPs, there is no need to change addresses. After registration and binding, the packet data of the mobile terminal received by the NMA will be sent to the target CAP, and then forwarded to the mobile terminal by the target CAP. The specific switching process is as follows:

1)移动终端进行CAP间切换,源CAP通过信令将移动终端的会话上下文信息传输给目标CAP;1) The mobile terminal switches between CAPs, and the source CAP transmits the session context information of the mobile terminal to the target CAP through signaling;

2)目标CAP向NMA发起注册绑定,将移动终端的地址和目标CAP的地址进行对应。注册绑定后,NMA接收到的发送给移动终端的分组数据将向目标CAP转发,再由目标CAP传输给移动终端。2) The target CAP initiates a registration binding to the NMA, and associates the address of the mobile terminal with the address of the target CAP. After registration and binding, the packet data sent to the mobile terminal received by the NMA will be forwarded to the target CAP, and then transmitted to the mobile terminal by the target CAP.

在上述AGW间切换过程中,包括CDMA 1x网络、HRPD网络中的PDSN间切换和演进网络中的CAP间切换,移动终端并不知道切换后AGW的地址。在移动终端和AGW进行信令交互时,信令的目标仍然是源AGW。目标AGW收到移动终端和AGW间的信令后,由于信令的目标地址不是自己的,会导致无法正常处理。During the above inter-AGW handover process, including inter-PDSN handover in CDMA 1x network and HRPD network, and inter-CAP handover in evolved network, the mobile terminal does not know the address of the AGW after handover. When the mobile terminal and the AGW perform signaling interaction, the target of the signaling is still the source AGW. After the target AGW receives the signaling between the mobile terminal and the AGW, since the target address of the signaling is not its own, it will fail to process normally.

例如,在HRPD网络中,如果发生了PDSN间切换,移动终端的会话状态转移到了切换后的目标PDSN,流映射也在切换后的目标PDSN执行。一旦业务流模板(TFT)的任何成分发生改变,如增加/删除媒体流、改变流处理方式、目标地址或端口改变,移动终端将使用资源预留协议(RSVP)信令更新TFT。但由于终端并不知道管理移动终端的PDSN已经转移,所以RSVP消息的目标地址仍然是源PDSN的。目标PDSN收到RSVP消息后,由于目标地址不是自己的,目标PDSN将不会进行相应的处理。这样导致会移动终端无法进行TFT更新操作。For example, in an HRPD network, if an inter-PDSN handover occurs, the session state of the mobile terminal is transferred to the target PDSN after the handover, and flow mapping is also performed on the target PDSN after the handover. Once any component of the traffic flow template (TFT) changes, such as adding/deleting media flow, changing the flow processing method, changing the destination address or port, the mobile terminal will use the resource reservation protocol (RSVP) signaling to update the TFT. However, since the terminal does not know that the PDSN managing the mobile terminal has been transferred, the target address of the RSVP message is still the source PDSN. After the target PDSN receives the RSVP message, since the target address is not its own, the target PDSN will not perform corresponding processing. As a result, the mobile terminal cannot perform the TFT update operation.

发明内容Contents of the invention

本发明的目的在于提供一种移动终端与接入网关的通信方法,使得移动终端在发生接入网关间切换后,新的接入网关能够正常处理自身与移动终端的信令。The purpose of the present invention is to provide a communication method between a mobile terminal and an access gateway, so that after the mobile terminal switches between access gateways, the new access gateway can normally process the signaling between itself and the mobile terminal.

为实现上述目的,本发明提供了一种移动终端与接入网关的通信方法,包括:In order to achieve the above object, the present invention provides a communication method between a mobile terminal and an access gateway, including:

移动终端与接入网关通信时,消息的目的地址设置为所述接入网关可识别的专用地址,所述接入网关根据所述专用地址获知该消息是所述移动终端与接入网关之间的信令,并进行相应处理。When the mobile terminal communicates with the access gateway, the destination address of the message is set as a dedicated address recognizable by the access gateway, and the access gateway learns that the message is between the mobile terminal and the access gateway according to the dedicated address. signaling, and deal with it accordingly.

移动终端与接入网关通信时,使用接入网关的单播地址作为目的地址发送信令,在重复发送多次或预设置的定时器超时后仍没有获得响应时,使用专用地址来发送信令;When the mobile terminal communicates with the access gateway, it uses the unicast address of the access gateway as the destination address to send signaling, and when it does not get a response after repeated sending multiple times or the preset timer expires, it uses the dedicated address to send signaling ;

所述接入网关根据所述专用地址获知该消息是所述移动终端与接入网关之间的信令,并进行相应处理。The access gateway learns that the message is signaling between the mobile terminal and the access gateway according to the dedicated address, and performs corresponding processing.

所述接入网关处理结束后,在回复给所述移动终端的信令中设置源地址为自身的单播地址;After the processing of the access gateway is completed, set the source address as its own unicast address in the signaling replied to the mobile terminal;

所述移动终端在发送后续的移动终端与接入网关间信令时,目的地址设置为所述接入网关的单播地址。When the mobile terminal sends subsequent signaling between the mobile terminal and the access gateway, the destination address is set as the unicast address of the access gateway.

所述专用地址为IPv4的广播地址。The dedicated address is an IPv4 broadcast address.

所述专用地址为IPv6的组播地址。The dedicated address is an IPv6 multicast address.

所述专用地址为保留的用于识别移动终端与接入网关之间信令交互的特定单播地址。The dedicated address is a specific unicast address reserved for identifying signaling interaction between the mobile terminal and the access gateway.

本发明通过移动终端在与目标接入网关通信时,将消息的目标地址设置为目标接入网关可识别的专用地址,使得目标接入网关能够正常处理自身与移动终端的信令。In the present invention, when the mobile terminal communicates with the target access gateway, the target address of the message is set as a special address recognizable by the target access gateway, so that the target access gateway can normally process the signaling between itself and the mobile terminal.

附图说明Description of drawings

图1为背景技术中CDMA2000系统的分组域结构图;Fig. 1 is the packet domain structural diagram of CDMA2000 system in the background technology;

图2为背景技术中演进网络的结构图;FIG. 2 is a structural diagram of an evolved network in the background technology;

图3为本发明的实施例一中移动终端与接入网关的通信方法的流程图;3 is a flowchart of a communication method between a mobile terminal and an access gateway in Embodiment 1 of the present invention;

图4为本发明的实施例二中移动终端与接入网关的通信方法的流程图。FIG. 4 is a flow chart of a communication method between a mobile terminal and an access gateway in Embodiment 2 of the present invention.

具体实施方式Detailed ways

本发明通过移动终端在与目标接入网关通信时,将消息的目标地址设置为目标接入网关可识别的专用地址,使得目标接入网关能够正常处理自身与移动终端的信令。In the present invention, when the mobile terminal communicates with the target access gateway, the target address of the message is set as a special address recognizable by the target access gateway, so that the target access gateway can normally process the signaling between itself and the mobile terminal.

实施例一:Embodiment one:

图3为本发明的实施例一中移动终端与接入网关的通信方法的流程图,FIG. 3 is a flowchart of a communication method between a mobile terminal and an access gateway in Embodiment 1 of the present invention,

具体执行以下步骤:Specifically perform the following steps:

步骤301、移动终端使用基于RSVP的Resv消息发送TFT信息给PDSN。如果该消息基于IPv4,则Resv的目标IP地址设置为预定的专用地址,该地址可为广播地址255.255.255.255;如果该消息基于IPv6,Resv的目标地址设置为预定的专用地址,该地址可为组播地址ff02::2,这样,链路上的所有路由器都会收到,PDSN作为接入网关,具有路由器功能,所以也能收到。Step 301, the mobile terminal sends TFT information to the PDSN by using the RSVP-based Resv message. If the message is based on IPv4, the destination IP address of Resv is set to a predetermined private address, which can be broadcast address 255.255.255.255; if the message is based on IPv6, the destination address of Resv is set to a predetermined private address, which can be Multicast address ff02::2, in this way, all routers on the link will receive it, and PDSN, as an access gateway, has the function of a router, so it can also receive it.

步骤302、PDSN判断该Resv消息的源地址合法,且目标地址是规定的专用地址,于是对信令进行相应处理。In step 302, the PDSN judges that the source address of the Resv message is legal and the destination address is a specified dedicated address, and then processes the signaling accordingly.

在执行本流程之前,如果移动终端发生了PDSN间的切换,移动终端的上下文信息被发送到了目标PDSN上,则Resv消息会被目标接入网转发给移动终端当前隶属的目标PDSN,由于消息中设置了预定的专用地址,所以目标PDSN会对该消息进行相应处理。Before executing this process, if the mobile terminal is handed over between PDSNs and the context information of the mobile terminal is sent to the target PDSN, the Resv message will be forwarded by the target access network to the target PDSN to which the mobile terminal currently belongs. A predetermined dedicated address is set, so the target PDSN will process the message accordingly.

实施例二:Embodiment two:

图4为本发明的实施例二中移动终端与接入网关的通信方法的流程图,FIG. 4 is a flowchart of a communication method between a mobile terminal and an access gateway in Embodiment 2 of the present invention,

具体执行以下步骤:Specifically perform the following steps:

步骤401、移动终端使用基于RSVP的Resv消息发送TFT信息给PDSN。Step 401, the mobile terminal sends TFT information to the PDSN by using the RSVP-based Resv message.

步骤402、在重复多次发送Resv没有收到响应,或者设定的定时器超时后,移动终端再次发送Resv消息,如果该消息基于IPv4,Resv的目标IP地址设置为预定的专用地址,该地址可为广播地址255.255.255.255。如果该消息基于IPv6,Resv的目标地址设置为预定的专用地址,该地址可为组播地址ff02::2,链路上的所有路由器都会收到,PDSN作为接入网关,具有路由器功能,所以也能收到。Step 402, after repeatedly sending Resv without receiving a response, or after the preset timer expires, the mobile terminal sends the Resv message again, if the message is based on IPv4, the target IP address of Resv is set to a predetermined dedicated address, the address It can be broadcast address 255.255.255.255. If the message is based on IPv6, the destination address of Resv is set to a predetermined dedicated address, which can be a multicast address ff02::2, and all routers on the link will receive it. PDSN acts as an access gateway and has router functions, so can also receive.

步骤403、当前PDSN判断该Resv消息的源地址合法,且目标地址是规定的专用地址,于是对信令进行相应处理。若处理成功,将响应Resv的确认(ResvConf)消息;对于源地址不合法或者没有成功处理的Resv消息,PDSN会返回Resv的出错(ResvErr)消息。ResvConf消息及ResvErr消息中的源地址设置为当前PDSN的地址。Step 403, the current PDSN judges that the source address of the Resv message is legal, and the destination address is a specified dedicated address, and then processes the signaling accordingly. If the processing is successful, it will respond to a Resv confirmation (ResvConf) message; for a Resv message whose source address is illegal or has not been successfully processed, the PDSN will return a Resv error (ResvErr) message. The source address in the ResvConf message and the ResvErr message is set to the address of the current PDSN.

步骤404、移动终端获得当前PDSN的地址后,后续发送的Resv消息,其目标IP地址设置为当前PDSN的地址。Step 404: After the mobile terminal obtains the address of the current PDSN, the target IP address of the Resv message sent subsequently is set as the address of the current PDSN.

在执行本流程前,如果移动终端发生了PDSN间的切换,其上下文信息被发送到了目标PDSN上,则该移动终端发送的Resv消息的目的地址为源PDSN地址,目标PDSN接收到该消息后,由于目的地址不是自身的地址,所以不会对该消息进行相应处理。而移动终端在重复多次发送Resv没有收到响应,或者设定的定时器超时后,会重新发送目的地址为预定专用地址的Resv消息,目标PDSN接收到该消息后,会对其进行相应处理。Before executing this process, if the mobile terminal is handed over between PDSNs and its context information is sent to the target PDSN, the destination address of the Resv message sent by the mobile terminal is the source PDSN address. After the target PDSN receives the message, Since the destination address is not its own address, the message will not be processed accordingly. However, the mobile terminal will resend the Resv message with the destination address as the predetermined dedicated address after repeatedly sending the Resv without receiving a response, or after the set timer expires, and the target PDSN will process it accordingly after receiving the message .

在本发明中,目标接入网关的地址也可设置为保留的用于识别移动终端与接入网关之间信令交互的特定单播地址,例如可以为1.1.1.1。In the present invention, the address of the target access gateway can also be set as a reserved specific unicast address for identifying signaling interaction between the mobile terminal and the access gateway, for example, it can be 1.1.1.1.

另外,本发明的实施并不仅限于在移动终端发生接入网关间切换后发送Resv消息这一种情况,当移动终端发送以当前服务的接入网关为目的地址,且需要服务接入网关根据该终端会话状态进行处理的消息时,都可采用本发明的方法。In addition, the implementation of the present invention is not limited to the case where the mobile terminal sends a Resv message after switching between access gateways. The method of the present invention can be used when processing messages in the session state of the terminal.

最后说明的是,以上实施例仅用以说明本发明的技术方案而非限制,尽管参照实施例对本发明进行了详细说明,本领域的普通技术人员应当理解,可以对本发明的技术方案进行修改或者等同替换,而不脱离本发明技术方案的精神和范围。Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalent replacement without departing from the spirit and scope of the technical solutions of the present invention.

Claims (6)

1. the communication means of portable terminal and IAD is characterized in that, comprising:
When portable terminal is communicated by letter with IAD, the destination address of message is set to the discernible specific address of described IAD, described IAD knows that according to described specific address this message is the signaling between described portable terminal and the IAD, and carries out respective handling.
2. the communication means of portable terminal according to claim 1 and IAD is characterized in that, this method specifically comprises:
When a, portable terminal are communicated by letter with IAD, use the unicast address of IAD to send signaling, when behind the timer expiry that repeats to send repeatedly or pre-set, still not obtaining response, use the specific address to send signaling as destination address;
B, described IAD are known that according to described specific address this message is the signaling between described portable terminal and the IAD, and are carried out respective handling.
3. the communication means of portable terminal according to claim 2 and IAD is characterized in that, also comprises after the described step b:
After described IAD processing finishes, the unicast address of source address for self is set in replying to the signaling of described portable terminal;
Described portable terminal is when sending between follow-up portable terminal and IAD signaling, and destination address is set to the unicast address of described IAD.
4. according to the communication means of claim 1,2 or 3 described portable terminals and IAD, it is characterized in that described specific address is the broadcast address of IPv4.
5. according to the communication means of claim 1,2 or 3 described portable terminals and IAD, it is characterized in that described specific address is the multicast address of IPv6.
6. according to the communication means of claim 1,2 or 3 described portable terminals and IAD, it is characterized in that the particular unicast address that be used to discern portable terminal and IAD between Signalling exchange of described specific address for keeping.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101909276B (en) * 2009-06-04 2013-01-23 中国移动通信集团公司 Mobile multicast switching method, system and relevant equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101909276B (en) * 2009-06-04 2013-01-23 中国移动通信集团公司 Mobile multicast switching method, system and relevant equipment

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