CN101163334A - Microwave access global intercommunication system and terminal switching method thereof - Google Patents

Microwave access global intercommunication system and terminal switching method thereof Download PDF

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Publication number
CN101163334A
CN101163334A CNA2007100048462A CN200710004846A CN101163334A CN 101163334 A CN101163334 A CN 101163334A CN A2007100048462 A CNA2007100048462 A CN A2007100048462A CN 200710004846 A CN200710004846 A CN 200710004846A CN 101163334 A CN101163334 A CN 101163334A
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terminal
target
multimedia broadcast
service
gateway
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CN101163334B (en
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李建勇
顾亮
李木森
梁文亮
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN2007100048462A priority Critical patent/CN101163334B/en
Priority to PCT/CN2007/070756 priority patent/WO2008046337A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0007—Control or signalling for completing the hand-off for multicast or broadcast services, e.g. MBMS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0064—Transmission or use of information for re-establishing the radio link of control information between different access points
    • 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
    • H04W8/00—Network data management
    • H04W8/26—Network addressing or numbering for mobility support

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

Abstract

The invention relates to the wireless communication field and discloses a WiMAX system and a terminal switch method thereof, which ensures that an activated terminal of the WiMAX system can keep the continuity of MBS business when switching. In the invention, when the terminal is switched, an object base station and/or an object gateway obtains a MBS identification received by the terminal from a source base station and/or a source gateway and issues the MBS corresponding to the identification. When the terminal is switched to the object base station, the object base station receives the MBS corresponding to the identification. If the object base station and/or the object gateway can not receive the MBS operation corresponding to the MBS identification, a bearing is established from a MBS server to the object gateway and then to the object base station. If the object base station and the source base station are located at different MBS zones, the object base station issues the relevant information that the MBS is received under the object base station to the termical.

Description

WiMAX system and terminal switching method thereof
Technical field
The present invention relates to wireless communication field, particularly the terminal handoff technique in the WiMAX system.
Background technology
IEEE802.16 is (the Institute of Electrical andElectronics Engineers of Institute of Electrical and Electronics Engineers, be called for short " IEEE ") in promulgation in December calendar year 2001, the standard that provides last kilometer WiMAX to insert at metropolitan area network is provided.
Meanwhile, numerous equipment and establishment supplier have formed World Interoperability for Microwave Access, WiMax (Worldwide Interoperability for Microwave Access, abbreviation " WiMAX ") tissue of forum, its purpose is to accelerate the deployment based on the broadband wireless network of above-mentioned IEEE802.16 series standard by guaranteeing broadband wireless access compatibility of apparatus and interoperability.Therefore, under normal conditions, the system that uses the realization WiMAX access of stipulating in 802.16 series standards is called the WiMAX system.
Fig. 1 shows the end-to-end reference model of WiMAX system.As can be seen, the WiMAX system mainly comprises travelling carriage (Mobile Station, be called for short " MS ")/subscriber station (Subscribe Station, abbreviation " SS "), access service network (Access Service Network, be called for short " ASN ") and connectivity serving network (Connectivity Service Network is called for short " CSN ").
ASN is defined as the network function set that the wireless access service is provided for the WiMAX user terminal, ASN has comprised base station (Base Station, be called for short " BS ") and ASN gateway (ASN GateWay is called for short " ASN-GW ") network element, an ASN may be shared by a plurality of CSN.
The major function of ASN comprises the function of base station and the function of ASN-GW.Wherein, the function of base station has: provide that the base station is connected with the L2 of subscriber station SS/MS, the compression and the encryption of RRM, measurement and the power control and the data of eating dishes without rice or wine.The function of ASN-GW has: for SS/MS authentication function provides agency (proxy) function; Support the network of NSP to find and selection; For SS provides relaying (Relay) function of L3 information, as IP address assignment.
CSN is defined as to the WiMAX user terminal IP is provided Connection Service.CSN mainly provides the IP address assignment of following function: SS/MS, Internet inserts, checking, mandate, charging protocol (Authentication, Authorization, Account, be called for short " AAA ") agency (proxy) or service (server), authorization control based on the user, ASN is to the tunnel of CSN, WiMAX user's charging and the clearing between the operator, tunnel under the roaming condition between the CSN, switching between the ASN and various WiMAX service (as location-based business, multi-medium multi-packet broadcasting and broadcasting service, IP Multimedia System business).
MS/SS is (moving) subscriber equipment, and the user uses this devices accessing WiMAX network.
What the WiMAX network was mainly followed now is IEEE 802.16-2004 (802.16d) standard of formulating in July, 2004.IEEE 802.16-2004 (802.16d) standard operation frequency range be 2GHz to 11GHz, be to authorize and unauthorized mixing frequency range.Adopt OFDM (OrthogonalFrequency Division Multiplexing, be called for short " OFDM ") and OFDM access (Orthogonal Frequency Multiple Access, abbreviation " OFDMA ") physical layer, effectively anti-multipath decline.Under the optimum channel decline situation, transmission rate can be approached 75Mbps.IEEE802.16-2004 (802.16d) standard is used for the non line of sight point-to-multipoint technology of metropolitan area network, mainly is the form of fixing and nomadic network, has added the technology of supporting simple mobile communication and full mobile communication among the IEEE 802.16e that is discussing.
Nowadays, fast development along with the internet, people no longer are satisfied with phone and messaging service to the demand of mobile communication, a large amount of multimedia services emerge, the some of them applied business requires a plurality of users can receive identical data simultaneously, as video request program, television broadcasting, video conference, online education, interactive game etc.These mobile multi-media services are compared with general data, have characteristics such as data volume is big, longer duration, delay sensitive.Present IP multicasting technology only is applicable to wired IP network, is not suitable for the mobile network, because the mobile network has particular network structure, functional entity and wave point, these are all different with wired IP network.
In order to effectively utilize mobile network resource, the WiMAX network has been introduced multicast broadcast service (Multicast Broadcast Service, be called for short " MBS "), promptly in the mobile network, provide a data source to send the point-to-multipoint service of data to a plurality of users, the realization Internet resources are shared, improve utilization rate of network resource, the interface resource of especially eating dishes without rice or wine.The MBS that the WiMAX network is introduced can not only realize the classes of messages multicast and the broadcasting of plain text low rate, and can also realize the multicast and the broadcasting of high-speed multimedia business, and this has complied with the trend of following mobile data development undoubtedly.
MBS based on the WiMAX network supports two kinds of access modules: single base station is inserted and many base stations are inserted.Under the access module of many base stations, a MBS territory (MBS Zone, identify by MBS zone ID) in all base stations with identical multicast connection identifier (CID (Multicast Connection ID, be called for short " MCID ") and MBS multicast group Security Association (MBS Group Security Association, be called for short " MBS GSA ") send the content that same MBS flows, the terminal of having registered the MBS service can receive the MBS contents by a plurality of base stations in the MBS territory.And when the terminal that is in free time (Idle) pattern moves in interior span base station, MBS district, do not need rebuild to connect, can impregnable receptions MBS, the seamless switching of realization MBS.
The service flow of some whole world definition can be carried to the broadcast or multicast information of a plurality of terminals.These service flow have service quality (Quality of Service is called for short " QoS ") parameter, also may need to encrypt with the data encryption key of whole world definition.In the WiMAX network, identify an one-way traffic flow with traffic stream identifier (ServiceFlow Identifier is called for short " SFID "), identify a connection with connection identifier (ConnectionID is called for short " CID ").All Business Streams transmit in the connection of eating dishes without rice or wine by MAC (medium access control) layer, and promptly SFID will be mapped on the CID.MCID is exclusively used in the connection identifier (CID that multicast connects.Simultaneously, the 802.16e regulation uses MBS content identification (ContentID) to identify a multicast service.A MCID goes up the protocol Data Unit (Protocol DataUnit is called for short " PDU ") that transmits and comprises one or more MBS.When the link layer of eating dishes without rice or wine connects a plurality of content of carrying, use logical channel identifier (Logical Channel ID is called for short " LCID ") to label at link layer, be used for indicating link layer message to carry which content when it.The unique corresponding content identification of LCID and MCID.
In existing standard, by organizing the Information Security that Security Association (Group Security Association is called for short " GSA ") guarantees a multicast group, as ensure the fail safe of information by the key information that guarantees a multicast group.A GSA comprises following key:
Group data encryption key (Group Traffic Encryption Key is called for short " GTEK "), GTEK is used for encrypting multicast packets, and it is shared between all terminals of same group.Each GSA has two GTEK.Produce at random in its other element in the base station or in the network, encrypt with the identical algorithms that is used for data encryption key (Traffic Encryption Key is called for short " TEK ") encryption.GTEK in " PKMv2Key-Request/Reply " message is encrypted by key-encrypting key (Key Encryption Key is called for short " KEK ").
Group key encryption key (Group Key Encryption Key is called for short " GKEK "), GKEK is produced at random by the base station, encrypts with KEK and sends to terminal.Each GSA has only a GKEK, and it is used for being encrypted in each GTEK of message in the same multicast group.Above-mentioned " PKMv2Key-Request/Reply " message is also encrypted by this GKEK.
Key information to MBS GSA describes below, comprises following key in the MBS GSA:
MBS KI (MBS Authentication Key is called for short " MAK "), MAK is the primary key information of MBS GSA, length is 160 bits, by the external entity preparation, as MBS server (MBD Server), MAK can share in all members in the MBS multicast group.
MBS multicast group data encryption key (MBS Group Traffic Encryption Key, be called for short " MGTEK "), length is 128 bits, is used for indirect protection MBS data, upgrades more frequently than MAK.MGTEK is by Access Network, as base station as the access network authorization key, and the random number that provides, it only is used for producing MBS data encryption key (MBS Traffic Key is called for short " MTK ") jointly with MAK.
MBS data encryption key MTK, MTK are used for encrypting MBS transmission data.It is 128 bit keys that produced by function by MAK and MGTEK, and terminal is decrypted the data of receiving according to the MTK that is generated by MAK and MGTEK.
At present, having described terminal among the MBS in the 802.16e/D12 agreement is in the business that Idle state (idle) is moved under the new base station in the same MBS territory (MBS-zone) and receives successional realization.But do not provide the terminal that is under activation (Active) attitude, when moving to base station new in the same MBS territory, for the optimization of contextual conveying flow.802.16e in do not describe yet and activate down, the problem of business continuance when moving to the new base station under the different MBS territory of the same MBS of transmission when terminal is in.
Summary of the invention
In view of this, the main purpose of embodiment of the present invention is to provide a kind of WiMAX system and terminal switching method thereof, makes that the terminal of activated state can keep the MBS business continuance when switching in the WiMAX network.
For achieving the above object, embodiment of the present invention provides a kind of terminal switching method of WiMAX system, comprises following steps:
When terminal was switched, target BS and/or intended gateway obtained the sign of the Multimedia Broadcast Multicast Service that this terminal receiving from source base station and/or source gateway;
Described intended gateway and target BS issue the corresponding Multimedia Broadcast Multicast Service of described sign;
After described terminal switches to described target BS, receive the corresponding Multimedia Broadcast Multicast Service of described sign from this target BS.
Embodiment of the present invention also provides a kind of WiMAX system, comprise target BS, intended gateway, source base station, source gateway, described source base station and/or source gateway comprise: the module that is used for sending the sign of the Multimedia Broadcast Multicast Service that described terminal receives when terminal is switched;
Described target BS and/or intended gateway comprise: the module that is used for obtaining the sign of the Multimedia Broadcast Multicast Service that this terminal receives when terminal is switched;
Described target BS and intended gateway also comprise: the module that is used to issue the corresponding MBS of described sign.
By relatively finding, the technical scheme of embodiment of the present invention and the main distinction of prior art are, when terminal is switched, obtain the sign of the MBS that this terminal receives by target BS and/or intended gateway from source base station and/or source gateway, and issue this and identify pairing MBS.After terminal switches to target BS, receive the corresponding MBS of this sign from this target BS.The terminal that has solved activated state in the WiMAX network switches to the successional problem of the professional transmission of MBS behind the different base station.Wherein, target BS and/or intended gateway obtain the sign of the MBS of this terminal reception from source base station and/or source gateway, comprised multiple situation, such as, target BS from source base station obtain, target BS from source gateway obtain, intended gateway from source gateway obtain, intended gateway obtains from source base station, if intended gateway is same gateway in source gateway, then target BS both can be described as from source gateway and had obtained, and also can be described as from intended gateway and obtained.
If target BS and/or intended gateway are not also received the pairing MBS business of the sign of MBS, then set up from MBS server (MBS Server) to intended gateway again the carrying of target BS.Thereby make and also can receive business continuously after the terminal of activated state switches to the base station that does not originally have the MBS sending down service in the WiMAX network.
If target BS and source base station are in different MBS territory (MBS Zone), then this target BS issues the relevant information that receives this MBS under this target BS to this terminal, guarantee that the terminal of activated state moves to the different following time of MBS territory of the same MBS of transmission, still can receive this MBS continuously.
If target BS and source base station are in the different MBS territory,, in advance the access information under the target BS is informed this terminal then by network-assisted mode.The handoff request message that target BS and/or intended gateway send by source base station and/or source gateway is obtained the sign of the MBS of this terminal reception, and switching the contextual information that increases this terminal when beginning in advance, set up transmission bearer and MBS key information for the base station that does not have MBS transmission before this, accelerated the process that terminal moves to the reception MBS after the target BS.
When if target BS and/or intended gateway are linked into target BS in this terminal, just set up the contextual information that carries and obtain the MBS key information accordingly and increase this terminal, can avoid finally not being linked into the wasting of resources that this target BS causes because of this terminal.
After terminal is linked into target BS, this target BS is deleted the contextual information of this terminal and the contextual information about this terminal of this MBS by intended gateway and source gateway notification source base station, if intended gateway and source gateway are not same gateways, then this intended gateway is notified contextual information that this source gateway deletes this terminal and the contextual information about this terminal of this MBS, with conserve system resources.
If the MBS service bearer is based on the foundation of MBS territory, then when the target BS of terminal and source base station are in same MBS territory, only need in the terminal context that transmits, to comprise the MBS service related information, and need not to follow the process of setting up the MBS service bearer, further guarantee terminal after switching to different base station, can receive MBS continuously.
Description of drawings
Fig. 1 is according to WiMAX network architecture schematic diagram in the prior art;
Fig. 2 is the terminal switching method flow chart according to first embodiment of the invention WiMAX system;
Fig. 3 is the terminal switching method flow chart according to third embodiment of the invention WiMAX system.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
First execution mode of the present invention relates to the terminal switching method of WiMAX system, and in the present embodiment, target BS and source base station that terminal is switched are in same MBS territory, and idiographic flow as shown in Figure 2.
In step 201, when the terminal that is in activated state was striden base station mobile in same MBS territory, by to serving BS, just source base station sent " MOB_MSHO_REQ " message and initiates switching flow.
Then, enter step 202, source base station receives after " MOB_MSHO_REQ " message that this terminal send that to gateway, just source gateway sends handoff request (HO request) message.In this handoff request message, carry the contextual information of this terminal, comprise the sign of this MBS in this contextual information.
What deserves to be mentioned is, if this terminal is to use dynamic Service constructive process (DSA) to add this MBS multicast group, then this MBS is designated service flow sign (SFID) and/or content identification (ContentID) and/or service identification (MBS service ID), that is to say, require to carry SFID and/or contents such as content identification and/or MBS Service ID in this handoff request message; Technology adds (IGMP join) this MBS multicast group if this terminal is used the multicast group, and then this is designated the ip multicast address of this MBS in this MBS territory, that is to say, requires to carry contents such as ip multicast address in this handoff request message.
Then, enter step 203, source gateway is transmitted this handoff request message to intended gateway, carries this terminal contextual information that comprises this MBS sign in the handoff request message of forwarding.Certainly, if source base station and target BS are with being connected a gateway, this step can be omitted.
Then, enter step 204, after intended gateway is received this handoff request message, by obtaining the MBS contextual information that the terminal contextual information obtains this terminal, further can obtain the context of this MBS business, so that after this terminal switches to this target BS, can under target BS, receive this MBS business, the terminal that has solved activated state in the WiMAX network switches to the successional problem of the professional transmission of MBS behind the different base station.
The MBS contextual information of this terminal is in order to allow intended gateway obtain the contextual information of this MBS business, so that intended gateway judges whether to exist the beared information of this MBS business, further judge and whether can carry out pre-registration and set up, so that keep the continuity of this MBS business with carrying for this business in the situation of this MBS service bearer not.
If this terminal is the terminal of first reception or potential this MBS of reception under this intended gateway, then need enter step 205, this intended gateway is to the MBS server registration, set up the service bearer of this MBS, also can receive business continuously after making the terminal of activated state in the WiMAX network switch to the base station of original not this MBS sending down service.Certainly, if source base station and target BS have been set up corresponding M BS service bearer with being connected a gateway on the gateway, this step can be omitted.
Specifically, because the MBS server has dual mode to the transmission of the business between gateway: the one, transmit all the time, whether control sends to Access Network according to Counting (counting) by gateway; The 2nd, when not having terminal to receive this MBS, networking closes not to be sent out yet.If the intended gateway and the source base station that switch belong to same MBS territory, receive this MBS business without any terminal down at it before this intended gateway, and what take between MBS server and this intended gateway in this case is second kind of service transferring mode, then the potential adding of a terminal at this moment just is equivalent to first adds this MBS business under intended gateway terminal.For the professional receiving course after accelerating to switch, can be registered to the MBS server this moment by this intended gateway, upgrading the descending playlist of this MBS business, and can set up the service bearer between this intended gateway and MBS server.
The foundation of intended gateway and MBS inter-server traffic carrying one of can be in the following manner finished:
(1) intended gateway is after receiving handoff request message, carries out the registration process of this MBS, the process of setting up of carrying out the carrying of this intended gateway and MBS inter-server traffic to the MBS server.That is to say that this step 205 is carried out in step 204 back.
(2) intended gateway has been after having sent switching response message, carries out the registration process of this MBS, the process of setting up of carrying out the carrying of this intended gateway and MBS inter-server traffic to the MBS server.That is to say that this step 205 is carried out in step 210 back.
(3) intended gateway is after receiving switch acknowledgment message, carries out the registration process of this MBS, the process of setting up of carrying out the carrying of this intended gateway and MBS inter-server traffic to the MBS server.That is to say that this step 205 is carried out in step 215 back.
In step 206, the handoff request message that intended gateway will carry this terminal contextual information that comprises this MBS sign sends to target BS.Certainly, if source base station and target BS are with being connected a gateway, then just source gateway sends this message.
Then, enter step 207, after target BS is received this handoff request message, obtain this terminal contextual information, and further obtained this MBS contextual information, so that after this terminal switches to this target BS, can under target BS, receive this MBS business, the terminal that has solved activated state in the WiMAX network switches to the successional problem of the professional transmission of MBS behind the different base station.
If this terminal is the terminal of first reception or potential this MBS of reception under this target BS, then switch in the set-up procedure at this, target BS need be acted on behalf of the relevant information that (MBS Proxy) asks this MBS to intended gateway or MBS, as MCID and Security Association sign (SAID) and contextual information etc.Suppose step 206 ' the be step of target base station requests MBS relevant information, then step 206 ' promptly can carry out in step 206 back also can be carried out in step 216 back.
If this terminal is the terminal of first reception or potential this MBS of reception under this target BS, also need enter step 208, this target BS is set up the service bearer of this MBS, and base station side is obtained association key.Also can receive business continuously after making the terminal of activated state in the WiMAX network switch to the base station of original not this MBS sending down service.This step can be in step 207 or step 209 or the execution of step 216 back.
Specifically, pre-registration and the registration process service bearer of setting up this MBS of target BS by carrying out data channel (data path), and in this service bearer process, obtain the association key of this MBS to authentication (Authentication Authorization Accounting, be called for short " AAA ") server or MBS server.The pre-registration of data channel and registration process can be finished with one of next stage:
(1) target BS carries out the pre-registration process of this data channel after receiving handoff request message, carries out the registration process of this data channel when receiving switch acknowledgment message.That is to say, carry out in step 207 back.
(2) target BS carries out the pre-registration process of this data channel after having sent switching response message, carries out the registration process of this data channel when receiving switch acknowledgment message.That is to say, carry out in step 209 back.
(3) target BS carries out the registration process of this data channel after receiving switch acknowledgment message.That is to say, carry out in step 216 back.
In step 209, target BS returns handoff response (HO response) message to intended gateway.
In step 210, intended gateway returns switching response message to source gateway.
In step 211, source gateway returns switching response message to source base station.
In step 212, source base station sends " MOB_BSHO_RSP " message to this terminal, responds the handoff request message that this terminal is initiated.
In step 213, this terminal sends " MOB_HO_IND " message to source base station, confirms this switching.
In step 214, this source base station sends to switch to source gateway confirms (HO confirm) message.
In step 215, this source gateway sends switch acknowledgment message to intended gateway.
In step 216, this intended gateway sends switch acknowledgment message to target BS.
If source base station and target BS can omit about the signaling process between gateway in the above-mentioned steps with being connected a gateway.
In step 217, when this terminal is linked into target BS, under this target BS, receive this MBS.It is to adopt p-t-p (point-to-point) transmission mode or p-t-m (point-to-multipoint) transmission mode to transmit this MBS that target BS carries out counting (counting) decision, if what originally adopt is the p-t-p pattern, but the target BS decision transforms to the p-t-m pattern, then by the leading flow path switch that carries out transmission mode of target BS.
For terminal, when this terminal moves and be linked into target BS following time in same MBS territory, if this target BS adopts this MBS of p-t-m mode transfer, and the source base station that this terminal is switched also adopts the p-t-m transmission mode to transmit this MBS, then this terminal need not be carried out the switching of transmission mode, utilizes original reception parameter promptly can continue to receive the MBS business.If target BS adopts this MBS of p-t-p mode transfer, source base station adopt p-t-m or/the p-t-p transmission mode transmits this MBS, perhaps target BS adopts this MBS of p-t-m mode transfer, source base station adopts the p-t-p transmission mode to transmit this MBS, and then target BS and this terminal need make this terminal carry out the reception of MBS business under the transmission mode of target BS by the transport mode translations flow process.
Be not difficult to find, because the handoff request message that target BS and/or intended gateway send by source base station and/or source gateway is obtained the sign of the MBS of this terminal reception, and switching the contextual information that obtains the MBS context in advance when beginning and increase this terminal, for setting up transmission bearer and MBS key information in the base station that does not have the MBS transmission before this, therefore, after this terminal is linked into target BS, can be immediately under this target BS, receive this MBS, accelerated the process that terminal moves to the reception MBS after the target BS.
When terminal after finishing access under the target BS, target BS need be notified original serving BS by internet message, just source base station is deleted the contextual information of this terminal and the relevant information of this terminal in the MBS context, with conserve system resources.
Specifically, when terminal after finishing access under the target BS, target BS send to insert the message of finishing to intended gateway, as step 218.
Then, intended gateway sends to source gateway and inserts the message of finishing, if intended gateway and source gateway are not same gateways, then intended gateway also needs to delete the contextual information of this terminal and the contextual information about this terminal of this MBS by the message informing source gateway that this access is finished, with conserve system resources.
Then, source gateway sends to source base station and inserts the message of finishing, and after source base station is received this message, deletes the contextual information and the relevant information of this terminal in the MBS context of this terminal, with conserve system resources.As step 220.
Need to prove that source gateway need notify its front to send handoff request message but last this terminal does not receive the target BS of this MBS business and the context that intended gateway is deleted this terminal down at it.If the terminal of this not being finished access as first potential user, for it has set up the service bearer of this MBS in advance, then also needs to remove carrying, with conserve system resources, as step 221.For still there not being terminal to receive the intended gateway of this MBS down at it, if what take is when not having terminal when it receives this MBS down, the MBS server does not send professional mode to it, and then intended gateway also needs to go to register this professional process to the MBS server.
Need to prove, not that same gateway is that example describes with intended gateway and source gateway in the present embodiment, if intended gateway and source gateway are same gateways, then can omit the Signalling exchange flow process of intended gateway and source gateway in the present embodiment, and, owing to set up the carrying of the MBS of terminal reception before this gateway, therefore, also need not to set up the correlation step of this MBS carrying.
Second execution mode of the present invention relates to the terminal switching method of WiMAX system, the present embodiment and first execution mode are roughly the same, its difference only is, in the first embodiment, target BS and/or intended gateway increase the contextual information of this terminal in advance when switching beginning, for before this not the base station of this MBS transmission set up transmission bearer and MBS key information, and in the present embodiment, when target BS and/or intended gateway are linked into target BS in this terminal, just increase the contextual information of this terminal, and for before this not the base station of this MBS transmission set up transmission bearer and MBS key information, to avoid finally not being linked into the wasting of resources that this target BS causes because of this terminal.
Specifically, after this terminal inserts under target BS,, then need to increase the contextual information of this terminal and in this MBS contextual information, add this terminal related information if this target BS has had this MBS business transmitting.Target BS need carry out the conversion of p-t-p/p-t-m pattern and judge, if this terminal adopted the p-t-m mode to receive this MBS business originally, and the p-t-m mode is adopted in the target BS decision, and then this terminal directly uses original MCID and key parameter can continue to receive this MBS.If this terminal need convert p-t-m to or convert p-t-p to from p-t-m from p-t-p, or all be the p-t-p transmission mode before and after moving, then need in the Ranging process, obtain new MCID or cid information, utilize new MCID or CID under target BS, to receive this MBS then.Certainly, also need in intended gateway, to increase the MBS contextual information of this terminal.
If the also not transmission of this MBS business under this target BS, after then this terminal is linked into this target BS, if this target BS decision takes the p-t-m pattern to transmit, then this target BS obtains the MBS key information to intended gateway or MBS proxy requests MCID and SAID and contextual information; If the decision of this target BS takes the p-t-p pattern to transmit, target BS CID allocation then, and, obtain the MBS key information to intended gateway or MBS proxy requests Security Association contextual information.Target BS is set up this MBS contextual information, the carrying between foundation and the intended gateway.
If under intended gateway, yet there is not terminal receiving this MBS before this, intended gateway did not carry out registration at the MBS server simultaneously, the service bearer that does not have this MBS of foundation and MBS server, then need intended gateway to carry out the registration of this MBS this moment, simultaneously the bearing resource of foundation and MBS server to the MBS server.
The 3rd execution mode of the present invention relates to the terminal switching method of WiMAX system, the present embodiment and first execution mode are roughly the same, its difference only is, in the first embodiment, target BS and source base station that terminal is switched are in same MBS territory, and in the present embodiment, the target BS that terminal is switched is in different MBS territories with source base station.
Idiographic flow as shown in Figure 3, in step 301, stride when the terminal that is in activated state and to have moved to when move the base station under the different MBS Zone that transmits same MBS, information or other modes such as ip multicast address by serviceannouncement (service bulletin) identical MBS content identification that comprises or identical MBS, this terminal can be known also can receive same MBS business under this target BS, and obtains the MBS content identification of same MBS business and/or ip multicast address and/or the MBS service identification of this MBS.Be the continuity of the MBS that receiving of this terminal after remaining on the position and moving this moment, this terminal can be in this case by to serving BS, just source base station sends " MOB_MSHO_REQ " message and initiates switching flow.
Step 202 is identical to step 316 with step 302 respectively to step 216, does not repeat them here.
In step 317, after terminal is linked into target BS, obtain under this target BS, to receive the required relevant information of this MBS by the Ranging access procedure, as MCID or CID etc.Because target BS can be judged this base station according to the sign of source base station in the handoff request message of receiving and be in different MBS territories with source base station, so this target BS need issue the required relevant information of this MBS of reception under this target BS to this terminal.After if this terminal inserts this target BS, target BS need switch transmission mode, and then by the leading flow path switch that carries out transmission mode of target BS, this target BS may need the MCID in intended gateway or this MBS territory of MBS agent application.
This shows, when target BS and source base station are in the different MBS territory, issue the relevant information that under this target BS, receives this MBS by target BS to this terminal, move to the different following time of MBS territory of transmitting same MBS, still can receive this MBS continuously with the terminal that guarantees activated state.
For terminal, if this terminal adopted the p-t-m pattern to receive originally, judge that according to the parameter area that target BS issues the new parameter that obtains is MCID, the transmission mode that source base station and target BS then are described all is the p-t-m pattern, and then this terminal utilizes the parameter that inserts this MBS under the target BS to insert; What adopt is the p-t-p transmission mode if this terminal is original, judges that according to parameter area the new parameter that obtains is MCID, then needs to remove earlier and being connected of source base station; Receive this MBS according to new parameter then.This terminal also needs the DSA process to obtain SAID and contextual information and informs MBS Content (content) tabulation, obtains the key information that this MBS needs by Key request/Key reply (key request/key response) flow process.
If the parameter area that this terminal issues according to target BS judges that the new parameter that obtains is CID, illustrate that then this terminal may be first terminal that receives this MBS under this target BS; Perhaps this target BS is adopting the p-t-p pattern originally, after this terminal adds this MBS of reception, the situation of transport mode translations does not take place also.This terminal obtains information such as SAID, LCID by the DSA process, obtain the key message that this MBS needs by Key request/Key reply flow process;
This terminal receives this MBS under target BS after, for conserve system resources, network side also needs the necessary information of deletion in related network elements, as step 318 to step 321, step 318 is identical to step 221 with step 218 respectively to step 321, does not repeat them here.
What deserves to be mentioned is, if target BS adopted this MBS of p-t-p mode transfer originally, after newly having added this terminal, target BS still can take the p-t-p pattern to transmit, then for the consideration of accelerating access procedure, this target BS can be selected CID allocation when the handoff request that receives from intended gateway; Also can be for considering to avoid waste the CID resource, when the handoff request that receives from intended gateway, select not CID allocation.If target BS still can adopt this MBS of p-t-m mode transfer after adopting p-t-m (point-to-multipoint) pattern to transmit, then newly having added this terminal, then this target BS need not CID allocation.
In addition, the target BS that switches for terminal and source base station are in the scene in different MBS territories, except can also initiating Join (adding) process again by terminal by switching flow by network side triggering (such scheme).The relevant MBS context at source base station/gateway place can be deleted, and rebulids context under the new MBS territory in target side (base station or gateway).
The 4th execution mode of the present invention relates to the terminal switching method of WiMAX system, present embodiment and the 3rd execution mode are roughly the same, its difference only is, in the 3rd execution mode, target BS and/or intended gateway increase the contextual information of this terminal in advance when switching beginning, for before this not the base station of this MBS transmission set up transmission bearer and MBS key information, and in the present embodiment, when target BS and/or intended gateway are linked into target BS in this terminal, just increase the contextual information of this terminal, and for before this not the base station of this MBS transmission set up transmission bearer and MBS key information, to avoid finally not being linked into the wasting of resources that this target BS causes because of this terminal.
That is to say, after this terminal inserts under target BS,, then need to increase the contextual information of this terminal and in this MBS context, increase this end message if this target BS has had this MBS business transmitting.If the also not transmission of this MBS business under this target BS, this terminal is that first adds the terminal that receives this MBS, because intended gateway and target BS do not obtain the relevant information of this MBS business before this, this terminal can't obtain information such as MCID or CID by the Ranging process, therefore needs this terminal to carry out the process of IGMP Join or the professional multicast group of DSA adding MBS.If intended gateway is not registered in the MBS server before this, then intended gateway need carry out the service log-on process and set up carrying to the MBS server this moment; If target BS did not carry out the pre-registration of bearing resource, then this target BS need carry out the registration process of bearing resource to intended gateway.
The 5th execution mode of the present invention relates to the terminal switching method of WiMAX system, present embodiment and the 3rd execution mode are roughly the same, its difference only is, in the 3rd execution mode, terminal is after being linked into target BS, obtain under this target BS, to receive the required relevant information of this MBS by the Ranging access procedure, as MCID or CID etc.And in the present embodiment, when target BS receives handoff request from intended gateway, notify this terminal under this target BS, to receive the required relevant information of this MBS by the Ranging access procedure, as MCID or CID etc., tell the Security Association relevant information by the DSA process, obtain the MBS key information by Key request/Key reply flow process.
That is to say, if target BS is at employing p-t-m this MBS of mode transfer or originally with this MBS of p-t-p mode transfer, but can adopt the p-t-m pattern to transmit after newly having added this terminal, then this target BS tells this terminal to receive the MCID that this MBS needs under this target BS by the Ranging process, tell this terminal SAID and contextual information by the DSA process, tell MBS key information by Keyrequest/Key reply process; If this target BS adopted the p-t-p pattern to transmit originally, after newly having added this terminal, this target BS still can take the p-t-p pattern to transmit, then this target BS can be selected CID allocation at this moment, tell this terminal under this target BS, to receive the CID that this MBS needs by the Ranging process, tell this terminal SAID and contextual information by DSA, tell MBS key information by Key request/Key Reply process.
Need to prove, in the respective embodiments described above, that describes all is based on the scene that the MBS service bearer is set up in the base station, if promptly target BS does not have the service bearer of terminal at the MBS of source base station reception, then in this target BS, set up the service bearer of this MBS again, but in actual applications, the MBS service bearer also can be based on the foundation of MBS territory, that is to say, when a MBS in a MBS territory, when having the terminal of first reception or potential this MBS of reception, the carrying of setting up this MBS under all base stations in this MBS territory and the gateway.At this moment, belong between the base station in a MBS territory handoff procedure just and the switching that does not receive the MBS business scenario under similar, difference is, comprises the MBS service related information in the terminal context of transmission.Be with the difference of the respective embodiments described above, in handoff procedure, do not follow the process of setting up the MBS service bearer.And the foundation of MBS service bearer then needs to occur under the handoff scenario between the MBS territory.
Such as terminal switches to base station B from base station A, and base station A and base station B are in same multicast and broadcast service domain.So, base station B just need obtain the contextual information of the MBS of this terminal by obtaining the contextual information process of this terminal.Because the MBS service bearer also can be based on the foundation of MBS territory, therefore, established the service bearer of this MBS before the B of base station, so base station B can issue this MBS by the carrying of having set up.
In like manner, if intended gateway and source gateway are not same gateways, but be in same MBS territory, then this intended gateway also can be by obtaining the contextual information process of this terminal, obtain the contextual information of the Multimedia Broadcast Multicast Service of this terminal, and issue this MBS by the carrying of having set up.
If base station A and base station B are in the different MBS territory, then need under all base stations in the residing MBS of base station B territory and gateway, set up the service bearer of this MBS.
Because the MBS service bearer is based on the foundation of MBS territory, therefore, when the target BS of terminal and source base station are in same MBS territory, only need in the terminal context that transmits, to comprise the MBS service related information, and need not to follow the process of setting up the MBS service bearer, further guarantee terminal after switching to different base station, can receive MBS continuously.
The 6th execution mode of the present invention relates to the WiMAX system, and this system comprises target BS, intended gateway, source base station, source gateway.Source base station and/or source gateway comprise: the module that is used for sending the sign of the MBS that this terminal receives when terminal is switched.Target BS and/or intended gateway comprise: the module that is used for obtaining the sign of the MBS that this terminal receives when terminal is switched.Target BS and intended gateway also comprise the module that is used to issue the corresponding MBS of this sign, switch to the successional problem of the professional transmission of MBS behind the different base station with the terminal that solves activated state in the WiMAX network.
Target BS and/or intended gateway also comprise and are used to set up from the MBS server to this intended gateway and the module of the service bearer this target BS, when this module is the terminal of first reception or potential this MBS of reception under this target BS and/or the intended gateway in this terminal, set up this service bearer.Thereby make and also can receive business continuously after the terminal of activated state switches to the base station that does not originally have the MBS sending down service in the WiMAX network.
Target BS also comprises: be used for when this target BS and source base station are in the different MBS territory, issue the module that receives the relevant information of this MBS under this target BS to this terminal; Obtain the module of the association key of this MBS with being used for setting up the service bearer process.Terminal is obtained the association key of this MBS by key request and response process.Guaranteed that the terminal of activated state moves to the different following time of MBS territory of the same MBS of transmission, still can receive this MBS continuously.
Target BS also comprises and is used for after this terminal is linked into this target BS, deletes the module of contextual information of this MBS of this terminal by intended gateway and source gateway notification source base station, has saved system resource.Intended gateway comprises and is used for when intended gateway and source gateway are not same gateway, notifies the module of the contextual information of this MBS that this source gateway deletes this terminal, has saved system resource.
In addition, what deserves to be mentioned is, source base station, source gateway, target BS, intended gateway can also comprise respectively: be used for working as a MBS in the residing MBS of present networks entity territory, when having the terminal of first reception or potential this MBS of reception, set up the module of the service bearer of this MBS.Make the MBS service bearer be based on that the MBS territory sets up.
Target BS also comprises and is used for when this target BS and source base station are in same MBS territory, by obtaining the contextual information process of terminal, obtains the module of contextual information of the MBS of this terminal.Being used to of target BS issues the module of the corresponding MBS of sign, when this target BS and source base station are in same MBS territory, issues this MBS by the carrying of having set up.
Intended gateway comprises also that to be used at this intended gateway and source gateway be not same gateway, but when being in same MBS territory, by obtaining the contextual information process of terminal, obtains the module of contextual information of the MBS of this terminal.Being used to of intended gateway issues the module of the corresponding MBS of sign, is not same gateway at this intended gateway and source gateway, but when being in same MBS territory, issues this MBS by the carrying of having set up.
This shows, when the target BS of terminal and source base station are in same MBS territory, only need in the terminal context that transmits, to comprise the MBS service related information, and need not to follow the process of setting up the MBS service bearer, further guarantee terminal after switching to different base station, can receive MBS continuously.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.

Claims (23)

1. the terminal switching method of a WiMAX system is characterized in that, comprises following steps:
When terminal was switched, target BS and/or intended gateway obtained the sign of the Multimedia Broadcast Multicast Service that this terminal receiving from source base station and/or source gateway;
Described intended gateway and target BS issue the corresponding Multimedia Broadcast Multicast Service of described sign;
After described terminal switches to described target BS, receive the corresponding Multimedia Broadcast Multicast Service of described sign from this target BS.
2. the terminal switching method of WiMAX system according to claim 1 is characterized in that, also comprises following steps:
If described target BS is in different multicast and broadcast service domains with described source base station, then this target BS issues the relevant information that receives described Multimedia Broadcast Multicast Service under this target BS to described terminal.
3. the terminal switching method of WiMAX system according to claim 2 is characterized in that, described target BS judges whether to be in different multicast and broadcast service domains with this source base station according to the sign of source base station in the handoff request message of receiving;
The relevant information of described Multimedia Broadcast Multicast Service comprises one of following or its combination in any:
The association key of multicast connection identifiers, Logic Channel Identifier, content identification, multicast and broadcast service domain sign, Multimedia Broadcast Multicast Service.
4. the terminal switching method of WiMAX system according to claim 1, it is characterized in that, if described terminal is the terminal of first reception or the described Multimedia Broadcast Multicast Service of potential reception under the described target BS, then this target BS obtains the relevant information of this Multimedia Broadcast Multicast Service from described intended gateway or Multimedia Broadcast Multicast Service agency.
5. the terminal switching method of WiMAX system according to claim 1 is characterized in that, also comprises following steps:
If described terminal is the terminal of first reception or the described Multimedia Broadcast Multicast Service of potential reception under described target BS and/or the intended gateway, then described target BS and/or intended gateway are set up from the Multimedia Broadcast Multicast Service server to this intended gateway and/or the service bearer this target BS.
6. the terminal switching method of WiMAX system according to claim 5, it is characterized in that, described target BS and/or intended gateway are receiving handoff request message that described source base station and/or source gateway send or switch acknowledgment message or when described terminal is linked into this target BS, are setting up from the Multimedia Broadcast Multicast Service server to this target BS and the service bearer this intended gateway.
7. the terminal switching method of WiMAX system according to claim 6 is characterized in that, the service bearer between described intended gateway and the described Multimedia Broadcast Multicast Service server is set up one of in the following manner:
Described intended gateway carries out the registration process of this described Multimedia Broadcast Multicast Service to described Multimedia Broadcast Multicast Service server when receiving handoff request message, set up and this Multimedia Broadcast Multicast Service server between service bearer;
Described intended gateway carries out the registration process of this described Multimedia Broadcast Multicast Service to described Multimedia Broadcast Multicast Service server after sending switching response message, set up and this Multimedia Broadcast Multicast Service server between service bearer;
Described intended gateway carries out the registration process of this described Multimedia Broadcast Multicast Service to described Multimedia Broadcast Multicast Service server after receiving switch acknowledgment message, set up and this Multimedia Broadcast Multicast Service server between service bearer;
Described intended gateway carries out the registration process of this described Multimedia Broadcast Multicast Service to described Multimedia Broadcast Multicast Service server after receiving that described terminal inserts message, set up and this Multimedia Broadcast Multicast Service server between service bearer.
8. the terminal switching method of WiMAX system according to claim 6 is characterized in that, the service bearer between described target BS and the described intended gateway is set up one of in the following manner:
Described target BS carries out the pre-registration process of described multicast broadcast service data passage when receiving handoff request message, carry out the registration process of this data channel when receiving switch acknowledgment message, finishes the foundation of described service bearer;
Described target BS carries out the pre-registration process of described multicast broadcast service data passage after sending switching response message, carry out the registration process of this data channel when receiving switch acknowledgment message, finishes the foundation of described service bearer;
Described target BS does not carry out the pre-registration process of described multicast broadcast service data passage, directly carries out the registration process of this data channel when receiving switch acknowledgment message, finishes the foundation of described service bearer;
Described target BS directly carries out the registration process of described data channel after described terminal inserts, finish the foundation of described service bearer.
9. the terminal switching method of WiMAX system according to claim 6 is characterized in that, obtains the association key of described Multimedia Broadcast Multicast Service in the service bearer process of described target BS between foundation and described intended gateway;
Described terminal is obtained the association key of described Multimedia Broadcast Multicast Service by key request and response process.
10. according to the terminal switching method of each described WiMAX system in the claim 1 to 9, it is characterized in that, also comprise following steps:
Described target BS and/or intended gateway add the contextual information of the Multimedia Broadcast Multicast Service of this terminal reception in the handoff request message that receives the transmission of described source base station and/or source gateway or when described terminal is linked into this target BS in this locality;
If described target BS and/or intended gateway have added the contextual information of the Multimedia Broadcast Multicast Service of described terminal reception in this locality, but this terminal is not linked into this target BS and/or intended gateway, and then described source gateway notifies this target BS and/or intended gateway to delete this contextual information.
11. terminal switching method according to each described WiMAX system in the claim 1 to 9, it is characterized in that described target BS and/or intended gateway obtain described sign by the handoff request message that described source base station and/or source gateway send.
12. the terminal switching method of WiMAX system according to claim 11, it is characterized in that, if described terminal uses the dynamic Service constructive process to add described Multimedia Broadcast Multicast Service, then described service flow sign and/or content identification and/or the service identification that is designated described Multimedia Broadcast Multicast Service;
Technology adds described Multimedia Broadcast Multicast Service, the then described ip multicast address that is designated described Multimedia Broadcast Multicast Service if described terminal is used the multicast group.
13. terminal switching method according to each described WiMAX system in the claim 1 to 9, it is characterized in that, after described terminal was linked into described target BS, this target BS was notified the contextual information that described source base station deletes this terminal and the contextual information about this terminal of described Multimedia Broadcast Multicast Service by described intended gateway and source gateway;
If described intended gateway and described source gateway are not same gateways, then described intended gateway is notified the contextual information that this source gateway deletes described terminal and the contextual information about this terminal of described Multimedia Broadcast Multicast Service.
14. the terminal switching method according to each described WiMAX system in the claim 1 to 9 is characterized in that, also comprises following steps:
After described terminal was linked into described target BS, this target BS judged whether to carry out the conversion of described Multimedia Broadcast Multicast Service transmission mode, if desired, was then dominated by this target BS and carried out the conversion of transmission mode.
15. the terminal switching method of WiMAX system according to claim 1 is characterized in that,
When a Multimedia Broadcast Multicast Service in a multicast and broadcast service domain, when having the terminal of first reception or potential this Multimedia Broadcast Multicast Service of reception, the carrying of setting up this Multimedia Broadcast Multicast Service under all base stations in this multicast and broadcast service domain and the gateway;
If the target BS of described terminal and source base station are in same multicast and broadcast service domain, then the target BS of this terminal is by obtaining the contextual information process of this terminal, obtain the contextual information of the Multimedia Broadcast Multicast Service of this terminal, and issue this Multimedia Broadcast Multicast Service by the carrying of having set up.
16. the terminal switching method of WiMAX system according to claim 15 is characterized in that,
If described intended gateway and described source gateway are not same gateways, but be in same multicast and broadcast service domain, then this intended gateway is by obtaining the contextual information process of this terminal, obtain the contextual information of the Multimedia Broadcast Multicast Service of this terminal, and issue this Multimedia Broadcast Multicast Service by the carrying of having set up.
17. WiMAX system, comprise target BS, intended gateway, source base station, source gateway, it is characterized in that described source base station and/or source gateway comprise: the module that is used for when terminal is switched, sending the sign of the Multimedia Broadcast Multicast Service that described terminal receives;
Described target BS and/or intended gateway comprise: the module that is used for obtaining the sign of the Multimedia Broadcast Multicast Service that this terminal receives when terminal is switched;
Described target BS and intended gateway also comprise: the module that is used to issue the corresponding Multimedia Broadcast Multicast Service of described sign.
18. WiMAX system according to claim 17, it is characterized in that, described target BS also comprises and is used for when this target BS is in different multicast and broadcast service domain with described source base station, issues the module that receives the relevant information of described Multimedia Broadcast Multicast Service under this target BS to described terminal.
19. WiMAX system according to claim 17 is characterized in that, described target BS and/or intended gateway also comprise:
Be used to set up from the Multimedia Broadcast Multicast Service server to this intended gateway and the module of the service bearer this target BS, when this module is the terminal of first reception or the described Multimedia Broadcast Multicast Service of potential reception under described target BS and/or the intended gateway in described terminal, set up this service bearer.
20. WiMAX system according to claim 19 is characterized in that, described target BS also comprises and is used for obtaining the module of the association key of described Multimedia Broadcast Multicast Service setting up described service bearer process;
Described terminal is obtained the association key of described Multimedia Broadcast Multicast Service by key request and response process.
21. WiMAX system according to claim 17, it is characterized in that, described target BS also comprises and is used for after described terminal is linked into this target BS, notifies the module about the contextual information of this terminal of contextual information that described source base station deletes this terminal and described Multimedia Broadcast Multicast Service by described intended gateway and source gateway;
Described intended gateway also comprises and is used for when described intended gateway and described source gateway are not same gateway, notifies the module about the contextual information of this terminal of contextual information that this source gateway deletes described terminal and described Multimedia Broadcast Multicast Service.
22. WiMAX system according to claim 17 is characterized in that,
Described source base station, source gateway, target BS, intended gateway comprise respectively: be used for working as a Multimedia Broadcast Multicast Service at the residing multicast and broadcast service domain of present networks entity, when having the terminal of first reception or potential this Multimedia Broadcast Multicast Service of reception, set up the module of the carrying of this Multimedia Broadcast Multicast Service;
Described target BS also comprises and is used for when this target BS and described source base station are in same multicast and broadcast service domain, by obtaining the contextual information process of terminal, obtains the module of contextual information of the Multimedia Broadcast Multicast Service of this terminal;
Being used to of described target BS issues the module of the corresponding Multimedia Broadcast Multicast Service of described sign, when this target BS and described source base station are in same multicast and broadcast service domain, issues this Multimedia Broadcast Multicast Service by the carrying of having set up.
23. WiMAX system according to claim 22 is characterized in that,
Described intended gateway comprises also that to be used at this intended gateway and described source gateway be not same gateway, but when being in same multicast and broadcast service domain, by obtaining the contextual information process of terminal, obtain the module of contextual information of the Multimedia Broadcast Multicast Service of this terminal;
Being used to of described intended gateway issues the module of the corresponding Multimedia Broadcast Multicast Service of described sign, is not same gateway at this intended gateway and described source gateway, but when being in same multicast and broadcast service domain, issues this Multimedia Broadcast Multicast Service by the carrying of having set up.
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