CN101675670A - Method for redirecting an mbms session - Google Patents

Method for redirecting an mbms session Download PDF

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Publication number
CN101675670A
CN101675670A CN200780053033A CN200780053033A CN101675670A CN 101675670 A CN101675670 A CN 101675670A CN 200780053033 A CN200780053033 A CN 200780053033A CN 200780053033 A CN200780053033 A CN 200780053033A CN 101675670 A CN101675670 A CN 101675670A
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node
sgsn
mbms session
layer
session
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Chinese (zh)
Inventor
L·G·F·阿尔斯特伦
L·奥尔森
P·拉姆尔
H·B·朗尼克
G·里德内尔
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/189—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast in combination with wireless systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/04—Arrangements for maintaining operational condition

Abstract

The present invention relates to a method for the redirection of a Multimedia Broadcast/Multicast Service (MBMS) session in a communication system comprising a plurality of node layers, wherein the MBMS session is redirected from one node to another node in the same node layer, such that the MBMS session is not aborted. The advantage of the invention is that an MBMS session can be redirected formone node to another node without aborting the MBMS session and thus there is no need to initialise a new MBMS session when a node in a communication system fails.

Description

Be used for being redirected the method for MBMS session
Technical field
The present invention relates to when for example one of support node goes wrong or when support node should be safeguarded, be redirected the method for multimedia broadcast/multi broadcast service (MBMS) session.Purpose is to be redirected the MBMS session and needn't to initiate whole distribution tree (distribution tree) for the MBMS session.
Background technology
In hand held mobile phone, use difference in functionality the bandwidth in the mobile phone broadcast system to be produced the needs that increase day by day.This visits when for example flowing video entry particularly like this some users simultaneously.In this example, each single user uses a connection separately.This means, if some users are visiting same inlet, for example all wishing to see when answering all users during the football match, if this inlet sends program then can save bandwidth on common broadcast channel so.
This type of is put the multiple spot service and is called as MBMS (MBMS, multimedia broadcast/multi broadcast service), in MBMS data is sent to a plurality of recipients from singly coming source entity.This is undertaken by this type of mode that BM-SC (BM-SC, broadcast/multicast service center) sends the required programs that can be received by all users.The area of broadcast program can be selected according to for example area or zone.When using the 3G communication system, because the high-bandwidth capacity that allows for example to flow video transmission of this system, this technology especially has advantage.
Only listen to passively owing to be connected to all users of single broadcast channel, do not connect to the special use that the service supplier set up through the base station so do not exist from single user.Under the out of order situation of one of node in system, thereby may there be the interruption of broadcasting, and may must rebulids session.
Summary of the invention
The objective of the invention is to eliminate at least some in the above-mentioned shortcoming, and improved telecommunication terminal is provided.
Particularly, purpose of the present invention thereby provide in communication system allows to be redirected to another node or child node the method for session under the situation of not ending session.
According to the present invention the solution of this problem is described at the characteristic about the claim 1 of this method.Other claim comprises according to the advantageous embodiment of method of the present invention and further improvement.
Employing is redirected the method for multimedia broadcast/multi broadcast service (MBMS) session in comprising the communication system of a plurality of node layer, realized purpose of the present invention, because the MBMS session is redirected to another node same node layer from a node, make the MBMS session do not ended.
This first embodiment by according to method of the present invention provides a kind of method, and this method allowed redirected MBMS session and needn't end whole M BMS session when the node in communication system was out of order.The advantage of this method is that the terminal use will be attached to the MBMS session during being redirected.For the terminal use, this will bring still less and/or shorter interruption.This means that also the terminal use will not disconnect with the MBMS session and being connected when node is out of order.
In favourable improvement of the present invention, the information that is used for the node of MBMS session in the node layer is comprised in the message that is sent to all nodes of described node layer by high node layer more.Its advantage is that all nodes in the node layer will know to have used which node in this layer.
In favourable improvement of the present invention, message sends to Section Point same node layer from first node, so that the MBMS session is transferred to described Section Point from described first node.Its advantage is redirected can the execution of MBMS session and does not relate to other layer in one deck.
In favourable improvement of the present invention, node layer is Serving GPRS Support Node (SGSN) layer.
In favourable improvement of the present invention, in node layer to the MBMS session can with the information of node be comprised in the response message that is sent to high node layer more.Its advantage is that more the high node layer will have the information of the node that uses in low node layer.This means, be redirected the MBMS session when more the high node layer can be out of order at the node in the low node layer, and do not need to end whole M BMS session.
The information that sends in response message can also comprise GPRS Tunnel Protocol-user plane (GTP-U) or GPRS Tunnel Protocol-control plane (GTP-C) information.This response message can also comprise IP addresses of nodes and tunnel endpoint identifier (TEID).
In favourable improvement of the present invention, but the first node in low node layer is the time spent no longer, use described information of hanging down the enabled node of node layer will begin message and send to the described Section Point that hangs down the node layer, so that the MBMS session is transferred to described Section Point from described first node from a node layer.Its advantage is to carry out being redirected of MBMS session and does not need to end whole M BMS session.
In favourable improvement of the present invention, described node layer is Gateway GPRS Support Node (GGSN) layer, and described low node layer is Serving GPRS Support Node (SGSN) layer.In of the present invention should the improvement, the node in the SGSN node layer can be SGSN or can be a plurality of user plane plates (User Plane board) that are included among the SGSN.Its advantage is not need to replace whole SGSN when a UP plate is out of order.
In favourable improvement of the present invention, described node layer is broadcast/multicast service center (BM-SC), and described low node layer is Gateway GPRS Support Node (GGSN) layer.
Description of drawings
To with reference to embodiment illustrated in the accompanying drawings the present invention be described in more detail hereinafter, wherein
Fig. 1 shows the signal communication system that is used for according to the first embodiment of the present invention,
Fig. 2 shows the flow chart according to the first embodiment of the present invention,
Fig. 3 shows the signal communication system that is used for according to another embodiment of the present invention,
Fig. 4 shows the signal communication system that is used for according to another embodiment of the present invention,
Fig. 5 shows among Fig. 4 the flow chart according to embodiments of the invention,
Fig. 6 shows the signal communication system that is used for according to another embodiment of the present invention,
Fig. 7 shows the signal communication system that is used for according to another embodiment of the present invention,
Fig. 8 shows among Fig. 7 the flow chart according to embodiments of the invention,
Fig. 9 shows the signal communication system that is used for according to another embodiment of the present invention,
Figure 10 shows among Fig. 9 the flow chart according to embodiments of the invention.
Embodiment
Having the embodiments of the invention that further develop and will only be regarded as example hereinafter described, and never the protection range that is provided by patent claims is limited.
Hereinafter, with the communication system of 3G-UMTS (third generation-Universal Mobile Telecommunications System) the type example as communication system, and used initialism is relevant with this type systematic that the 3GPP (3G partner program) that uses 21.905 defines.Be appreciated that the present invention may be used on for example communication system of other type of 4G system etc., and used definition does not limit to scope of the present invention.
The example of broadcast communication system is shown in Figure 1.This system is made up of the distribution tree that comprises different transmission node layers.The top node 101 responsible data flow that send that are called BM-SC (broadcast/multicast service center) here.MBMS (MBMS, the multimedia broadcast/multi broadcast service) session that is sent to Section Point is initiated by BM-SC.BM-SC will be according to for example from the input initiation session of server etc.Section Point layer 102 comprises one or more GGSN (GGSN, Gateway GPRS Support Node), be GGSN1 and GGSN2 in this example, the Section Point layer will be distributed to the 3rd node layer 103 that is called as SGSN (SGSN, Serving GPRS Support Node) from the signal of BM-SC.This node comprises one or more SGSN, is SGSN1, SGSN2 and SGSN3 in this example, and this node further will be distributed to the 4th node layer 104 that is called as RNC (RNC, radio network controller) from the signal of GGSN.The 4th node layer comprises the one or several RNC of the wireless area that is connected to the wireless antenna that comprises the service terminal user successively, is RNC1, RNC2, RNC3, RNC4 and RNC5 in this example.
In this communication system, the 3rd node layer can dispose by different way.Each SGSN can be addressed separately, and perhaps a plurality of SGSN are configurable in SGSN pond (SGSN Pool) 105, and the SGSN pond makes some SGSN can be connected to same RNC, and vice versa.This makes the counterweight balance between the SGSN become possibility.It also makes it possible under the unbroken situation of service (perhaps at least with minimum interruption) SGSN in the pond is safeguarded, because the multicast service that this SGSN handles can be redistributed to other SGSN in the pond.Identical principle also may be used on the pond (pooling) in the 4G system.
When BM-SC initiates the MBMS broadcast session, set up distribution tree at this MBMS session.BM-SC will send the tabulation that comprises the SGSN that participates in actual session to the message of GGSN in the initiation process.Therefore, each GGSN knew between the starting period will comprise for which SGSN, makes GGSN can attempt being connected to each SGSN during initialization.When setting up distribution tree, all RNC will be connected to GGSN by SGSN, thereby set up the MBMS session from BM-SC to terminal use.When SGSN becomes unavailable, will go wrong.This moment, the RNC that is connected to this SGSN will lose and the getting in touch of system, and GGSN can not be session redirection to other SGSN in existing systems.As an alternative, the MBMS session will be ended and will have to set up new MBMS session.
This is because the following fact: do not have redistributing of ongoing MBMS session in existing standard.Because therefore GGSN does not know SGSN pond and member thereof, and do not understand whether other SGSN pond member also handles this MBMS session, so under SGSN maintenance or out of order situation, do not make GGSN or SGSN shift the possibility of MBMS session.This means that under the out of order situation of SGSN or during the maintenance at SGSN, ongoing MBMS will be from out of order SGSN and ended, even if this node itself is the part in pond downwards.Therefore, the terminal use who is attached to this part of distribution tree will see that its session is ended.
Making GGSN detect the out of order unique selection of SGSN is by echo (echo) request mechanism, but GGSN can not do anything except sending warning in this case.This means that the redirected of session is impossible.System will receive error code, and final system may be restarted, and this means and must set up new distribution tree.This means that also all terminal uses will see the termination of MBMS session.According to the time of setting up new distribution tree, some terminal uses will meet with quite long interruption, and other terminal use will notice the interruption of short a little point.According to the available service that offers the terminal use, also possible is: all terminal uses must proceed to the newly attached of MBMS session, because initial session has been ended.This solution is slower, and does not guarantee the stable transfer of session material.
Therefore, method of the present invention is associated with the redirected possibility of the MBMS session between different nodes or the child node, makes the termination of MBMS session there is no need.
In the first embodiment of the present invention, BM-SC notice GGSN will have payload stream about which SGSN.GGSN is transmitted to all SGSN that use with this information during this session, this means, receives at SGSN that " when the MBMS session began request information, it can be its partner SGSN pond companion of the SGSN identified in list of receiving.
SGSN is safeguarded and MBMS session when carrying out at needs, can make SGSN with for example independently transfer command shift its ongoing MBMS session.According to the tabulation of the SGSN that belongs to this pond, identify other SGSN pond member, and this SGSN can transfer to session among the SGSN pond member who is identified one or more with " request of MBMS session updates ".The RNC that other SGSN pond member will attempt not being connected to already with those them is connected, with the same in common start-up course.
Need not upgrade this GGSN, because other SGSN pond member has the ongoing MBMS data flow to them already.To be stopped its session just in a controlled manner by the SGSN of power down.Make this SGSN when it stops session with reason-code show to the successful transfer of another SGSN be favourable.
In the second embodiment of the present invention, this covers in " the MBMS session the begins response " message that sends to GGSN by all SGSN that allow each SGSN will belong to same SGSN pond during the initialization of session and realizes.Therefore, each GGSN will know the member which SGSN is SGSN pond used during this MBMS session.Therefore under the out of order situation of SGSN of pre-treatment MBMS session, another member that GGSN has to same SGSN pond initiates the possibility of " the MBMS session begins (or renewal) request ".
When SGSN broke down, it may can not stop session in a controlled manner.In this case, the detection of SGSN fault can realize by " echo request/response mechanism " among the GGSN.This mechanism advantageously is applied on GTP-C (GPRS Tunnel Protocol-control plane) and GTP-U (GPRS Tunnel Protocol-user plane) path.Also can between controlled amortization period, use " echo request/response mechanism ".
With reference now to Fig. 2,, the detailed example of redirection process is described.In the bracket after various method steps, provided the example of the possible message that can be used to initiate this method step.These examples will not limit the present invention in any way.
At first step 201 (RAR/RAA), BM-SC initiates the MBMS broadcast session.The tabulation that participates in the SGSN of this session is comprised in to the message of GGSN1 and GGSN2.In this example, this tabulation will comprise SGSN1, SGSN2 and SGSN3.SGSN2 can use for this session, but need not in this session.
Second step 202 (the MBMS session begins request), GGSN1 and GGSN2 to this tabulation, comprise that all SGSN in the tabulation of the SGSN that participates in this session send " the MBMS session begins request ".In this example, begin request and be sent to SGSN1 and SGSN3.This means that SGSN1 will know SGSN3 and be included in this session, and SGSN3 will know SGSN1 and be included in this session.
Third step 203 (the MBMS session begins request), SGSN1 and SGSN3 send " the MBMS session begins request " to all available RNC.According to for example area, zone or capacity, different RNCs can connect with different SGSN.This can for example be " service first-earlier " mechanism.In this example, RNC1, RNC2 will be connected with SGSN1 with RNC4, and RNC3 will be connected with SGSN3 with RNC5.
The 4th step 204 (shift MBMS order), for example owing to safeguard or load is shared and initiated redirected from the session of SGSN3.This realizes so that the MBMS session of activity is transferred to SGSN1 from SGSN3 by sending " shifting MBMS " order.
The 5th step 205 (the MBMS session stops request), SGSN3 sends " the MBMS session stops request " to RNC3 that connects and RNC5.
In the 6th step 206 (MBMS session updates request), SGSN3 sends for example " request of MBMS session updates " so that show this transfer to SGSN1.The message that sends can comprise the relevant information with the RNC that is connected to SGSN3 (being RNC3 and RNC5 in this example).In this case, among the RNC which SGSN1 will know and not be connected to SGSN, and thereby know it which RNC trial is connected to.
Finishing the 7th step 207 (the MBMS session begins request) that is redirected of MBMS session, according to the information that is comprised in the message that sends in the 6th step, SGSN1 is to RNC---whole RNC or send " the MBMS session begins to ask " to RNC3 and RNC5 at least.
Alternatively, in the 6th step, can send directly that " the MBMS session begins request information.When SGSN1 received this message, the RNC that SGSN1 will attempt not being connected to all SGSN1 was connected.If this message comprises the relevant information with the RNC that is connected to SGSN3 (in this example for RNC3 and RNC5), then SGSN1 can only attempt being connected with those RNC of showing in this message.
When finishing to be redirected, all RNC will be connected with SGSN, and the work of MBMS broadcast session.Carry out in a controlled manner owing to be redirected, will notice not that this is redirected so be attached to the terminal use of each RNC, and the MBMS session is not ended.
In the second embodiment of the present invention, as shown in Figure 3, MB-SC 301 will send " the MBMS session begins request " of the tabulation that comprises the SGSN 303 that comprises in the MBMS session to all GGSN 302.The specific MBMS session of which GGSN and SGSN actual treatment will mechanism be determined at random, and all other requests to same session will be rejected by " service earlier " among GGSN and the SGSN.
Fig. 3 is illustrated in the MBMS data flow when having set up the MBMS session.Be shown in dotted line unaccepted connection owing to the MBMS session of having set up from another source.
In this embodiment, the GGSN that receives the refusal response in the initial startup of session will continue to attempt being connected to low node again with the time interval of rule with SGSN (dotted line).One have fault in the low node, be SGSN because maintenance stops, this node just will be connected to another more high node.In this example, if for example SGSN4 shuts down, then do not need new connection, because all SGSN have been connected to GGSN from GGSN to SGSN.Simultaneously, all SGSN will attempt being connected with RNC 304 again.In this example, RNC6 will be disconnected connection when SGSN4 stops.Therefore, will be connected with RNC6 one of among the remaining SGSN.This will allow the MBMS session only to continue with of short duration interruption (overtime according to what disposed).
In another embodiment of the present invention, as shown in Figure 4, comprise in the system and to the MBMS session can with SGSN 403 be grouped in the SGSN pond 405.During the initialization that session begins, the tabulation that each SGSN will be included in other SGSN in the SGSN pond is included in " the MBMS session the begins response " message that sends to GGSN 402.Therefore, each GGSN will understand for current which SGSN of MBMS session and be comprised in the SGSN pond.Therefore, handling to the disabled situation of specific SGSN of the MBMS session of a plurality of RNC 404 current, another member that GGSN will have to same SGSN pond initiates the possibility of " the MBMS session begins (or renewal) request ".
The detection of SGSN fault can realize by " echo request/response mechanism " in GGSN.This mechanism advantageously is applied on GTP-C (GPRS Tunnel Protocol-control plane) and GTP-U (GPRS Tunnel Protocol-user plane) path.
In this embodiment, GGSN detects SGSN at it and initiates being redirected of MBMS session when unavailable.Preferably, be out of order at SGSN, be under the situation of service disruption controlled termination can not the time use this mechanism.Can also during the restarting of SGSN, use this mechanism.In this case, even under the situation of restarting, finish before this restarts, GGSN also transfers to the MBMS session another SGSN pond member, so that interrupt minimizing.
The detailed example of the redirection process of this embodiment is described with reference to Fig. 5.
At first step 501 (RAR/RAA), BM-SC initiates the MBMS broadcast session.The tabulation of the available SGSN of this session is comprised in to GGSN, in this example in the message for GGSN1 and GGSN2.In this example, this tabulation will comprise SGSN1, SGSN2 and SGSN3.
Second step 502 (the MBMS session begins request), GGSN1 and GGSN2 all SGSN in this tabulation send " the MBMS session begins request ", send " the MBMS session begins request " to SGSN1, SGSN2 and SGSN3 in this example.In this example, SGSN1 will be connected with GGSN1, and SGSN3 will be connected with GGSN2.
Third step 503 (the MBMS session begins request), SGSN1 and SGSN3 send " the MBMS session begins request " to all available RNC.According to for example area, zone or capacity, different RNCs will be connected with SGSN in a known way.In this example, RNC1, RNC2 will be connected with SGSN1 with RNC4, and RNC3 will be connected with SGSN3 with RNC5.
In the 4th step 504 (echo request), SGSN3 stops owing to fault or maintenance.GGSN2 will detect this situation by " echo request/response mechanism " in GGSN.Therefore, GGSN2 will detect the fault of SGSN3.
The 5th step 505 (the MBMS session begins request), GGSN2 will attempt being connected with another SGSN in the SGSN pond member tabulation.If GGSN2 attempts being connected with SGSN1, then will send " the MBMS session the begins response " message of negating, because SGSN1 is connected with GGSN1 by SGSN1.When the GGSN2 trial was connected with SGSN2, by sending " the MBMS session begins request ", GGSN2 received sure " the MBMS session begins response ", because SGSN2 is not connected this moment.
Finishing the 6th step 506 (the MBMS session begins request) that is redirected of MBMS session, SGSN2 sends " the MBMS session begins request " to all available RNC, so that those available RNC are connected to ongoing MBMS session.
Finish when being redirected, all RNC will be connected with SGSN, and the work of MBMS broadcast session.Be redirected and carry out in a controlled manner, and do not need to restart whole M BMS session.
In another embodiment of the present invention, as shown in Figure 6, BM-SC 601 will send " the MBMS session begins request " of the tabulation that comprises the SGSN 603 that can use the MBMS session to all GGSN 602.Therefore, all available GGSN and all available SGSN will can use the MBMS session.The specific MBMS session of which GGSN and SGSN actual treatment will be determined at random, and will be rejected all other requests of same session by " service earlier " mechanism among GGSN and the SGSN.
MBMS data flow when Fig. 6 is illustrated in the MBMS session and has set up.Be shown in dotted line unaccepted connection owing to the MBMS session of having set up from another source.
In this embodiment, the GGSN that receives the refusal response in the initial startup of session will continue to attempt being connected to low node again with the time interval of rule with SGSN (dotted line).One have fault in the low node, be SGSN because maintenance stops, this node just will be connected to another more high node.In this example, if for example SGSN4 shuts down, then do not need new connection, because all SGSN have been connected to GGSN from GGSN to SGSN.Simultaneously, all SGSN will attempt being connected with RNC 604 again.In this example, RNC6 will disconnect connection when SGSN4 stops.Therefore, will be connected with RNC6 one of among the Yu Xia SGSN.This will allow the MBMS session only to continue with of short duration interruption (overtime according to what disposed).
In another embodiment of the present invention, carry out being redirected of MBMS session between the different child nodes in SGSN.This is shown in Fig. 7 and 8.
BM-SC node 701 initiates to set up distribution tree in network, thereby sets up the MBMS session.The BM-SC node is responsible for MBMS control signaling and user's payload is distributed.The control signaling that is used for broadcasting is made up of so that set up distribution tree at network downward transmission " the MBMS session begins " message substantially.In this process, up link node, for example GGSN 702 were used in receiving downlink node, for example SGSN in 703 minutes the IP address of the user's payload that receives MBMS.When having set up distribution tree, can begin the MBMS session, and the user in the sub-district that is comprised can begin to receive the MBMS session in distribution tree.
Downlink node in the MBMS distribution tree, for example SGSN can wish the payload that sends through this node is redistributed for some reason.SGSN can comprise the one or more UP plates (UP-board) 706,707 (UP, user plane) that are used for the payload distribution.Each the UP plate that uses in SGSN is connected to GGSN by unique ip address, and promptly each UP plate has himself connection to GGSN.Each UP plate can be considered to the child node of SGSN.
, have and necessaryly will transfer to another UP plate of this SGSN for example because fault or safeguard need be disconnected when connecting at one of UP plate by the payload that this UP plate is handled.For payload, different plates has the new IP address that GGSN will send this payload to it.In current MBMS standard, do not exist the IP address that makes SGSN with new MBMS session information, for example be used for payload to initiate and the possibility of upgrading GGSN.UP plate in SGSN becomes and can not handle under the situation of MBMS payload, will lose the MBMS session from this specific SGSN along branch road and under distribution.Therefore, the terminal use will experience the termination of MBMS session.
In this embodiment, propose to allow SGSN initiate " request of MBMS session updates ", so that shift the GTP-U tunnel that it is used for the MBMS session.GGSN and SGSN and thereby the UP plate between communicate by letter can be regarded as during use fixedly connected, wherein, in the SGSN of communication link side, be that GTP-U (GTP tunnel agreement-user plane) is used in the connection of UP plate, and use GTP-C (GTP tunnel agreement-control plane) at the communication link of GGSN side.
This requires SGSN can initiate to receive the position of MBMS session payload, promptly send " request of MBMS session updates " from the UP plate of reality to GGSN from it.This message will comprise the address of this UP plate.GGSN will stop to the IP address of before having set up in " the MBMS session begins process ", promptly send user's payload to a UP plate, and beginning is to the IP address of receiving in " update inquiry information ", promptly to replacing the IP address of the UP plate of a UP plate to send this payload.Preferably, this message also can comprise the GTP-U TEID (TEID of this UP plate, tunnel endpoint identifier), preferably GGSN is inserted in each GTP-U packet header that the SGSN that participates in the MBMS session sends, and SGSN matches specific MBMS session with it with grouping.
IP address and the TEID of CP (CP, control plane) can also be included in " request of MBMS session updates " initiated by SGSN.In this case, SGSN can initiate the transfer of related CP, if desired like this.
With reference now to Fig. 8, this embodiment is described.
At first step 801 (RAR/RAA), BM-SC initiates the MBMS broadcast session.Tabulation to the available SGSN of this session is comprised in to the message of GGSN.In this case, for clarity sake, only use a GGSN, and this tabulation will only comprise a SGSN.
Second step 802 (the MBMS session begins request), all GGSN all SGSN in this tabulation send " the MBMS session begins request ".In this example, GGSN will be connected with SGSN.
Third step 803 (the MBMS session begins request), all SGSN send " the MBMS session begins request " to all available RNC.According to for example area, zone or capacity, different RNCs will be connected with this SGSN in a known way.In this example, RNC1, RNC2 will be connected with SGSN with RNC3.
At the 4th step 804 (MBMS session data), the MBMS session is carried out, and wherein payload is sent to SGSN from GGSN.
At the 5th step 805 (MBMS session data), the MBMS session is carried out, and wherein payload is sent to RNC from SGSN.
In the 6th step 806 (MBMS session updates request), for example share or after UP plate fault shuts down at the UP plate owing to the maintenance of SGSN, load, SGSN will send " request of MBMS session updates " to GGSN, so that the MBMS payload is transferred to new IP address, is another UP plate among the SGSN.GGSN will beam back " response of MBMS session updates " this request for confirmation to SGSN.
At the 7th step 807 (MBMS session data), GGSN uses from new IP address another plate to SGSN that SGSN receives, the UP plate transmission MBMS session payload that promptly is transferred to MBMS payload in the 6th step.
At the 8th step 808 (MBMS session data), continue the MBMS session, wherein payload is sent to RNC from SGSN.
By the 8th step, all RNC will be connected to SGSN, and the MBMS broadcast session continues.Be redirected and carry out in a controlled manner, and do not need to restart whole M BMS session.
In another embodiment of the present invention, the GGSN in the MBMS distribution tree can wish the payload that sends by this node is redistributed for some reason.This for example can be because the fault of GGSN or the situation of maintenance.In this case, the payload of GGSN must be transferred to another GGSN, promptly must be redirected the MBMS session, so that keep this MBMS session effectively and make the terminal use keep attached with the MBMS session.
Use existing solution, the transfer that the MBMS session is carried out owing to the fault among the GGSN realizes by the foundation that BM-SC restarts distribution tree.This realizes that by sending " the MBMS session begins " message to new GGSN described new GGSN will be set up to the connection of the SGSN in this distribution tree again by BM-SC.SGSN will be set up to the connection of RNC in the distribution tree again, and the MBMS session will be set up once more.In order to restart like this, will have to end old MBMS session.Therefore, the terminal use will notice the interruption of MBMS session or even end.
In according to inventive method of the present invention, as shown in Figure 9, GGSN 902 will transmit the GTP-C tunnel information (IP address and TEID) that is used for the available SGSN of MBMS session 903 to BM-SC901, make BM-SC will have the information which SGSN can be used for current MBMS session about.Like this, under the maintenance or out of order situation of a GGSN, BM-SC can transfer to the MBMS session another GGSN.Because BM-SC has the GTP-C tunnel information that is used for all SGSN of being connected with old GGSN, so it can be transmitted to new GGSN with this information.Then, new GGSN can send " request of MBMS session updates " to SGSN, so that new GGSN is transferred to from old GGSN in its GTP-C tunnel.Being redirected of this MBMS session can be carried out in a controlled manner, this means to rebulid whole M BMS session.Therefore, the termination of MBMS session will do not occurred, so the payload traffic is influenced hardly.
Fig. 9 illustrates the MBMS data flow when GGSN1 sets up the MBMS session.The MBMS session is initiated (arrow 905) by BM-SC.The GTP-C tunnel information (IP address and TEID) that GGSN1 will be used for SGSN1 and SGSN2 sends back BM-SC (arrow 906), makes BM-SC know in current MBMS session and has used SGSN1 and SGSN2.
After GGSN1 shuts down owing to for example conflict, fault or calculated maintenance, be interrupted to the payload stream of GGSN1.Because " house dog " function in the interface between BM-SC and the GGSN (for example DWR/DWA, equipment house dog request/answering), BM-SC will know GGSN when move undesired.Then, BM-SC will send " the MBMS session begins request " (arrow 907) to GGSN2.Be included in the SGSN that uses in the MBMS session, be the information of SGSN1 and SGSN2 from this message of BM-SC, comprise the GTP-C tunnel information.Therefore, GGSN2 will receive IP address and the TEID that is used for SGSN1 and SGSN2.This means that GGSN2 can begin to send MBMS session payload to SGSN1 and SGSN2 immediately.Because SGSN1 and SGSN2 are also connected to the RNC that uses in the MBMS session, so the MBMS session will proceed to the terminal use, and not need to end the MBMS session and do not need to initiate new MBMS session.Therefore, the terminal use will also be attached to the MBMS session, and may only experience of short duration interruption (if present).
With reference to Figure 10 this embodiment is described.
At first step 1001 (RAR/RAA), BM-SC initiates the MBMS broadcast session.To this session can with the tabulation of SGSN be comprised in to the message of GGSN.All GGSN that can be used for the MBMS session are by the BM-SC addressing.In this example, GGSN2 sends refusal to BM-SC and answers, and only uses GGSN1 when the beginning of MBMS session.
Second step 1002 (the MBMS session begins request), all GGSN all SGSN in this tabulation send " the MBMS session begins request ".In this example, SGSN will be connected with GGSN1.GGSN1 receives the information from SGSN in response message.
In step 1002a (MBMS session updates request), GGSN, will show SGSN information, promptly be used for the IP address of each SGSN and the update inquiry information of TEID (for example, " request of MBMS session updates ") and send it back BM-SC for GGSN1 herein.
Third step 1003 (the MBMS session begins request), all SGSN send " the MBMS session begins request " to all available RNC.According to for example area, zone or capacity, different RNCs will be connected with SGSN in a known way.
At the 4th step 1004 (MBMS session data), the MBMS session is carried out, and wherein payload is sent to SGSN from GGSN, and wherein payload is also sent to RNC downwards from SGSN.
In the 5th step 1005 (RAR/RAA (SGSNx information)), for example share or after fault shut down, BM-SC for example used watchdog function to notice that GGSN work is undesired owing to the maintenance among the GGSN, load at GGSN.Then, BM-SC will send that " the MBMS session begins request information, so that GGSN2 is transferred in the MBMS session to GGSN2.This request message can comprise RAR (RAR, authorization requests again).This request message also can comprise this request and be at old GGSN, is the indication of the fault among the GGSN1, make new GGSN, be GGSN2 not downstream SGSN send session and begin message.GGSN2 sends it back MB-SC with " the MBMS session begins response " message, for confirmation should the request.
At the 6th step 1006 (MBMS session data), MB-SC sends MBMS session payload to GGSN2, and GGSN2 further sends to SGSN with the MBMS session.
In the 7th step 1007 (MBMS session updates request), GGSN2 sends to SGSN and " MBMS session updates request information and GGSN2GTP-C information, promptly is used for the IP address and the TEID of control plane.Therefore, SGSN can send it back GGSN2 to control plane message.Alternatively, this message also can continue to send before the MBMS session in step 6.
By this embodiment, the MBMS session will continue, and need not end the MBMS session and not need the new MBMS session of initialization.Owing to be redirected the MBMS session, being connected between SGSN and the RNC is not terminated.Therefore, the terminal use will be attached to RNC all the time, and therefore be attached to the MBMS session.
In another embodiment of the present invention, can carry out being redirected of MBMS session by the following method.
Adjudicate so that the MBMS broadcast session is transferred to new GGSN.BM-SC sends to new GGSN that " the MBMS session begins request information.This message advantageously comprises the MBMS session not to be new session but will to be transferred to the indication of the existing session of new GGSN.New GGSN will send " the MBMS session begins response " message to BM-SC.
" MBMS session updates request information is so that upgrade SGSN with new GGSN GTP-C tunnel information (IP address and TEID) to the SGSN transmission for new GGSN.This information will be used when control plane message is sent it back GGSN by SGSN.
SGSN will comprise GGSN GTP-C tunnel information (the IP address and the TEID that are used for user plane) " response of MBMS session updates " message and send it back new GGSN.
After this, BM-SC sends MBMS session payload to new GGSN, and new GGSN sends this MBMS session payload to SGSN.
This is favourable, the situation during especially for planned change that carry out GGSN.In this case, the process among the new GGSN can begin concurrently with the session among the old GGSN.
The present invention is not regarded as being limited to embodiment mentioned above, and in the scope of patent claims of enclosing, multiple extra modification is possible with changing.Used term does not limit this scope, but is appreciated that present principles may be used on distinct communication standards.

Claims (13)

1. method that is used for being redirected multimedia broadcast/multi broadcast service (MBMS) session in the communication system that comprises a plurality of node layer, be characterised in that: described MBMS session is redirected to another node same node layer from a node, makes that described MBMS session is not ended.
2. the method for claim 1, further comprising the steps of:
The information that will be used for the node of described MBMS session in node layer is included in the message that is sent at least some nodes of described node layer by the nodes higher layer.
3. method as claimed in claim 2, further comprising the steps of:
Message is sent to Section Point same node layer from first node, so that described MBMS session is transferred to described Section Point from described first node.
4. method as claimed in claim 3, wherein, described node layer is Serving GPRS Support Node (SGSN) layer.
5. the method for claim 1, further comprising the steps of:
Will be in node layer to described MBMS session can with the information of node be included in the response message that is sent to the nodes higher layer.
6. method as claimed in claim 5, further comprising the steps of:
But the first node in low node layer is the time spent no longer, use described information of hanging down the enabled node of node layer will begin message and send to the described Section Point that hangs down node layer, so that described MBMS session is transferred to described Section Point from described first node from node layer.
7. method as claimed in claim 6, wherein, described node layer is Gateway GPRS Support Node (GGSN) layer, and described low node layer is Serving GPRS Support Node (SGSN) layer.
8. method as claimed in claim 7, wherein, the node in the described low node layer comprises a plurality of user plane plates.
9. method as claimed in claim 6, wherein, described node layer is broadcast/multicast service center (BM-SC), and described low node layer is Gateway GPRS Support Node (GGSN) layer.
10. method as claimed in claim 5, further comprising the steps of:
In the described response message that is sent to described nodes higher layer, send GPRS Tunnel Protocol-user plane (GTP-U) information.
11. method as claimed in claim 5 is further comprising the steps of:
In the described response message that is sent to described nodes higher layer, send GPRS Tunnel Protocol-control plane (GTP-C) information.
12. as claim 10 or 11 described methods, wherein, described response message comprises IP addresses of nodes and tunnel endpoint identifier (TIED).
13. a communication system, described communication system are fit to enforcement of rights and require each described method step among the 1-12.
CN200780053033A 2007-05-21 2007-05-21 Method for redirecting an mbms session Pending CN101675670A (en)

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