WO2009067866A1

WO2009067866A1 - Method and network system for establishing sessions in multimedia broadcast/multicast service

Info

Publication number: WO2009067866A1
Application number: PCT/CN2008/071245
Authority: WO
Inventors: Qingchun Lin
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-11-28
Filing date: 2008-06-10
Publication date: 2009-06-04
Also published as: CN101175252A; CN101175252B

Abstract

A method for establishing sessions in Multimedia Broadcast/Multicast Service and a Multimedia Broadcast/Multicast Service network system, in which the method includes: sending the request message for establishing sessions to the receiving end; receiving the response message returned by the receiving end; if the returned response message shows a failure of establishing sessions caused by a resource is unusable, the request message for establishing sessions is resent to the receiving end from the sending end; or if the returned response message shows a failure of establishing sessions and the informing message showing that the resource is usable is received subsequently, the request message for establishing sessions is resent to the receiving end.

Description

Method and network system for establishing session in multimedia broadcast multicast service

This application claims priority to Chinese Patent Application No. 200710168187.6, entitled "Method and Network System for Establishing Sessions in Multimedia Broadcast Multicast Service", filed on November 28, 2007, the entire contents of which are incorporated by reference. Combined in this application.

Technical field

The present invention relates to the field of communications technologies, and in particular, to a method and network system for establishing a session in a multimedia broadcast multicast service.

Background technique

Multimedia Broadcast/Multicast Service (MBMS) is defined by the 3rd Generation Partnership Project (3GPP) for point-to-multipoint one-way multimedia services. The MBMS uses the air interface to transmit multimedia broadcast services to users in the cell through the common channel, or multicasts the multicast service subscribed by the user to the users in the cell, thereby saving air interface resources. The main application of MBMS is the mobile TV service. In addition, it can also support services such as broadcast download and music TV interaction. MBMS is based on General Packet Radio Service (GPRS, Wideband Code Division Multiple Access) packet network, by adding some new functional entities, such as broadcast multicast service center (BM- SC, Broadcast-Multicast Service Centre), and existing packet domain functional entities such as GPRS Serving GPRS Support Node (SGSN), GPRS Gateway Support Node (GGSN), Base Station Controller (BSC) , Base Station Controller) / Radio Network Controller (RNC) and User Terminal (UE, User Equipment) add MBMS function, and define a new logical shared channel to achieve air interface resource sharing.

MBMS defines two services: broadcast service and multicast service. In the course of research and practice on the prior art, the inventors found that the prior art has the following problems:

The establishment process of the connection between different network element devices in the MBMS in the prior art is one-way. From the BM-SC to the GGSN, the SGSN, the BSC/RNC, the network element devices establish a session in turn, if two network element devices are in between When the establishment of a session fails due to the unavailability of the resources of the downstream network element device, there is no corresponding processing procedure in the prior art to ensure that a session can be established between the two network element devices, even if the subsequent downstream network element device resources are available, Because the connection establishment process is unidirectional, as long as the upstream network element device does not re- A request is made to the downstream network element device, and the session between the two network element devices cannot be established. As a result, the user in the corresponding network element device area cannot always enjoy the MBMS service. Therefore, the method for establishing a session in the prior art MBMS is not It is very reliable. For example, when the GGSN sends the "MBMS Session Start Request" message to the SGSN, if the SGSN returns to the GGSN the "MBMS Session Start Response" indicates that the session establishment fails due to resource unavailability, there is no corresponding processing flow in the prior art. Then, the session between the GGSN and the SGSN may not be established at all times, which will cause the users in the corresponding SGSN service area to fail to receive the MBMS session. In addition, similar problems exist between the BM-SC and the GGSN, and between the SGSN and the BSC/RNC.

Summary of the invention

The technical problem to be solved by the embodiments of the present invention is to provide a method and a network system for establishing a session in a multimedia broadcast multicast service, which can reliably establish a session in a multimedia broadcast multicast service.

In order to solve the above technical problem, the embodiment provided by the present invention is implemented by the following technical solutions: The embodiment of the present invention provides a method for establishing a session in a multimedia broadcast multicast service, including: sending a request message for establishing a session to a receiving end; Receiving a response message returned by the receiving end; if the returned response message indicates that the establishment of the session fails due to resource unavailability, the transmitting end resends the request message for establishing a session to the receiving end; or The response message indicates that the establishment of the session fails, and subsequently receives the notification message indicating that the resource is available to the receiving end, and then re-sends the request message for establishing the session to the receiving end.

The embodiment of the present invention provides a multimedia broadcast multicast service network system, including a first network element device and a second network element device: the first network element device is configured to send a request message for establishing a session, and receive the second The response message returned by the network element device, if the returned response message indicates that the establishment of the session fails due to the resource being unavailable, resending the request message for establishing the session; or if the returned response message indicates that the establishment of the session fails, and subsequent reception And sending, to the second network element device, a request message for establishing a session, to the second network element device, where the second network element device is configured to receive the first network element device. After the sent request message for establishing the session, the response message is returned to the first network element device.

An embodiment of the present invention provides a network element device, including: a transceiver unit, configured to receive a request message for establishing a session; and a detecting unit, configured to detect, after the receiving and receiving unit receives a request message for establishing a session, whether the available resource is included; a unit, configured to record when the detecting unit detects that no resources are available Establishing the service information of the session failure, notifying the transceiver unit to send a response message indicating that the session is failed due to the resource being unavailable, and sending a notification message indicating that the resource is available when the detecting unit detects that the resource is available.

The embodiment of the present invention provides a network element device, including: a transceiver unit, configured to send a request message for establishing a session, and receive a returned response message; and a retransmission unit, where the response message received by the transceiver unit indicates that the resource is unavailable After the failure to establish a session, or the response message received at the transceiver unit indicates that the establishment of the session has failed, and subsequently receives a notification message indicating that the resource is available, the request message for establishing the session is resent.

It can be seen from the foregoing technical solutions that the method for establishing a session in the MBMS in the prior art is not very reliable. After one network element device sends a request message to another network element device, if the session fails due to resource unavailability, The corresponding processing procedure may result in a series of problems. The technical solution of the embodiment of the present invention is: in a session start session of a broadcast or multicast service, the sending end sends a request message for establishing a session to the receiving end; Receiving a response message returned by the receiving end; if the returned response message indicates that the establishment of the session fails due to resource unavailability, the transmitting end resends the request message for establishing a session to the receiving end. In this way, when the upstream network element device learns that the establishment of the session fails because the resources of the downstream network element device are unavailable, even if the downstream network element device does not know when the resource is available, it is re-established to the downstream network element device. The session request message can ensure that if the downstream network element device has resources available, the two network element devices can establish a session again, so that users in the corresponding network element device area can enjoy the MBMS service. Therefore, the technical solution of the embodiment of the present invention implements a reliable establishment of a session in the MBMS, and avoids a series of problems caused by the corresponding processing flow after the failure of establishing a session in the prior art.

DRAWINGS

1 is a flowchart of a method for establishing a session according to an embodiment of the present invention;

2 is a flowchart of a reliable setup session between a GGSN and an SGSN according to an embodiment of the present invention; FIG. 3 is a flowchart of a reliable setup session between a GGSN and an SGSN according to Embodiment 2 of the present invention; FIG. 4 is a third embodiment of the present invention. FIG. 5 is a schematic diagram of a format of a message message of an MBMS resource available notification according to an embodiment of the present invention; FIG. 6 is a flowchart of a reliable establishment session between a BM-SC and a GGSN according to an embodiment of the present invention; FIG. 7 is a schematic structural diagram of a multimedia broadcast multicast service MBMS network system according to an embodiment of the present invention. detailed description

The embodiment of the invention provides a method for establishing a session in a multimedia broadcast multicast service, which can reliably establish a session in a multimedia broadcast multicast service.

Referring to FIG. 1 , it is a flowchart of a method for establishing a session according to an embodiment of the present invention, which includes the following steps: Step 401: Send a request message for establishing a session;

In the network system, the sending end sends a request message for establishing a session to the receiving end, requesting to establish a session. Step 402: Receive a returned response message.

After receiving the request message for establishing a session sent by the sending end, the receiving end returns a response message to the sending end according to the availability of the resource, and the sending end receives the returned response message.

Step 403: If the returned response message indicates that the establishment of the session fails, the request message for establishing the session is resent.

When the sending end receives the returned response message indicating that the establishment of the session fails due to resource unavailability, the sending end resends the request message for establishing the session to the receiving end; or if the returned response message indicates that the establishment of the session fails, and subsequent reception And when the receiving end indicates a notification message that the resource is available, the request message for establishing the session is resent to the receiving end. The request message for resending the establishment session may be continuously resent at a set time interval until the session is successfully established, or may be continuously resent within a maximum number of retransmissions that are not exceeded, or may be considered simultaneously. The interval of resend and the number of retransmissions.

For ease of understanding, the following is an example of establishing a reliable session between the GGSN and the SGSN. Referring to FIG. 2, it is a reliable process of establishing a session between a GGSN and an SGSN according to an embodiment of the present invention, which includes the following steps:

Step 501: The BM-SC sends a "Session Start Request" message to the GGSN.

The BM-SC sends a "Session Start Request" message to the GGSN indicating the data transmission to be started and the related attributes of the session. The related attributes of the session include: TMGI, QoS, MBMS service area, session ID, estimated session duration, Broadcast/multicast indication, SGSN list (only for broadcast mode), data transmission time, 2G/3G indication, etc.

Step 502: The GGSN returns a "Session Start Response" message to the BM-SC.

After receiving the "Session Start Request" message, the GGSN establishes the MBMS bearer context, stores the relevant attributes of the session and the associated SGSN identity, and returns "Session Start" to the BM-SC. Response"message;

Step 503: The GGSN sends an "MBMS Session Start Request" message to each SGSN.

The GGSN sends an "MBMS Session Start Request" message to the relevant SGSNs according to the indication of the BM-SC, and notifies the relevant attributes of the SGSN session, including TMGI, QoS, MBMS service area, session ID, estimated session duration, broadcast/multicast. Indication, time of data transmission, 2G/3G indication, etc.

Step 504: The SGSN returns an "MBMS Session Start Response" message to the GGSN, indicating that the session creation fails;

After receiving the "MBMS Session Start Request" message sent by the GGSN, the SGSN cannot establish an MBMS bearer context because the resource is unavailable, and sends an "MBMS Session Start Response" message to the GGSN, indicating that the session creation fails. The reason value is "The SGSN has no resources available." ".

Step 505: The GGSN resends the "MBMS Session Start Request" message to the SGSN according to the set time interval.

The GGSN receives the "MBMS Session Start" returned from the SGSN indicating that the session creation failed.

After the Response message, the message "MBMS Session Start Request" is resent to the SGSN for a while, waiting for the SGSN to have available resources.

If the GGSN returns a "MBMS Session Start Response" message to the SGSN and the SGSN returns a "MBMS Session Start Response" message indicating that the session creation failed, the GGSN continues to resend after a delay. In this way, when the SGSN is available, the GGSN and the SGSN can establish an MBMS session. This prevents the SGSN from returning to the GGSN in the "MBMS Session Start Response" in the prior art. The adverse consequences of coming.

Considering that the appropriate delay time of different networks may be different, the interval at which the GGSN resends the "MBMS Session Start Request" message can be configured according to the network conditions.

Step 506: The SGSN returns an "MBMS Session Start Response" message to the GGSN to indicate that the session is successfully created.

After receiving the "MBMS Session Start Request" message resent by the GGSN, the SGSN establishes an MBMS bearer context and stores the session-related attributes to the GGSN. Returns a "MBMS Session Start Response" message indicating that the session was created successfully.

Referring to FIG. 3, it is a reliable flow diagram of establishing a session between the GGSN and the SGSN according to Embodiment 2 of the present invention. The main difference between the second embodiment and the first embodiment is that the GGSN resends the "MBMS Session Start Request" message to the SGSN by the set number of times. The figure includes the following steps:

Step 601: The BM-SC sends a "Session Start Request" message to the GGSN.

Step 602: The GGSN returns a "Session Start Response" message to the BM-SC.

After receiving the "Session Start Request" message, the GGSN establishes the MBMS bearer context, stores the relevant attributes of the session and the associated SGSN identifier, and returns "Session Start" to the BM-SC.

Response" message;

Step 603: The GGSN sends an "MBMS Session Start Request" message to each SGSN.

Step 604: The SGSN returns an "MBMS Session Start Response" message to the GGSN, indicating that the session creation fails.

Step 605: The GGSN resends the "MBMS Session" to the SGSN according to the set number of retransmissions.

Start Request" message;

After receiving the "MBMS Session Start Response" message returned from the SGSN indicating that the session creation failed, the GGSN resends the "MBMS Session Start Request" message to the SGSN to wait for the SGSN to have available resources. If the GGSN resends the "MBMS Session Start Request" message to the SGSN, the SGSN still returns an "MBMS Session Start Response" message indicating that the session creation failed, and the GGSN continues to resend again. In this way, when the SGSN is available, the GGSN and the SGSN can establish an MBMS session. This prevents the SGSN from returning to the GGSN in the "MBMS Session Start Response" in the prior art. The adverse consequences of coming.

Considering that the SGSN may indeed be unable to establish an MBMS session in some cases, if the MBMS session establishment request is repeatedly sent to the SGSN repeatedly, the signaling load of the network will be increased, so the GGSN repeatedly sends the "MBMS Session Start Request" message to the SGSN. The number of times can be configured, that is, set a maximum number of retransmissions.

Step 606: The SGSN returns an "MBMS Session Start Response" message to the GGSN to indicate that the session is successfully created.

After receiving the "MBMS Session Start Request" message resent by the GGSN, the SGSN establishes an MBMS bearer context, stores the session-related attributes, and returns a "MBMS Session Start Response" message to the GGSN, indicating that the session is created successfully.

It should be noted that, in the foregoing embodiment, the time interval of resending the "MBMS Session Start Request" message and the number of retransmissions may be considered at the same time, that is, each time the GGSN receives the "MBMS Session Start Response" message indicating that the session creation failed. The "MBMS Session Start Request" message is resent to the SGSN at a pre-configured time interval, and the number of retransmissions does not exceed the pre-configured maximum number of retransmissions.

Referring to FIG. 4, it is a reliable flow diagram of establishing a session between the GGSN and the SGSN according to Embodiment 3 of the present invention. The difference between the embodiment 3 and the first embodiment and the second embodiment is that the SGSN returns a "MBMS Session Start Response" message indicating that the session creation fails after the SGSN returns to the GGSN, and if the subsequent discovery finds that a resource is available, the GGSN is actively notified, and the GGSN receives the notification. Then resend the "MBMS Session Start Request" message. The figure includes the following steps:

Step 701: The BM-SC sends a "Session Start Request" message to the GGSN.

The BM-SC sends a "Session Start Request" message to the GGSN indicating the data transmission to be started and the related attributes of the session. The related attributes of the session include: TMGI, QoS, MBMS service area, session ID, estimated session duration, Broadcast/multicast indication, SGSN list (only for wide Broadcast mode), data transmission time, 2G/3G indication, etc.

Step 702: The GGSN returns a "Session Start Response" message to the BM-SC.

After receiving the "Session Start Request" message, the GGSN establishes an MBMS bearer context, stores the relevant attributes of the session and the associated SGSN identifier, and returns a "Session Start Response" message to the BM-SC;

Step 703: The GGSN sends an "MBMS Session Start Request" message to each SGSN.

Step 704: The SGSN returns an "MBMS Session Start Response" message to the GGSN, indicating that the session creation fails.

Step 705: After the SGSN fails to create a session, record the corresponding GGSN address and session information. Step 706: The SGSN sends an "MBMS Resource Available Notification" message to the corresponding GGSN. When the SGSN has resources available, according to the recorded GGSN address and session information. Sending a newly defined "MBMS Resource Available Notification" message to the corresponding GGSN, notifying the GGSN that resources are available.

The "MBMS Resource Available Notification" message is a newly defined message for the SGSN to notify the GGSN that resources are available.

See Figure 8 for the "MBMS Resource Available Notification" message message format.

As shown in Figure 5, the "MBMS Resource Available Notification" message includes the cell End User Address and the Access Point Name. These two cells are mandatory and together identify the corresponding MBMS. Carrying business.

Step 707: The GGSN resends the "MBMS Session Start Request" message to the SGSN. After receiving the notification message, the GGSN knows that the SGSN has resources available and resends to the SGSN.

The "MBMS Session Start Request" message re-initiates the MBMS bearer setup process. Step 708: The SGSN returns an "MBMS Session Start Response" message to the GGSN to indicate that the session is successfully created.

It should be noted that the foregoing embodiment is an example of a reliable session establishment process between the GGSN and the SGSN, but is not limited thereto. Similarly, the method can be extended to between the BM-SC and the GGSN, and the SGSN and the BSC/RNC. The principle of establishing a reliable session is the same.

The following is a brief introduction to the process of establishing a reliable session between the BM-SC and the GGSN. Referring to FIG. 6, FIG. 6 is a flowchart of establishing a reliable session between the BM-SC and the GGSN according to Embodiment 4 of the present invention, and the steps include:

Step 901: The BM-SC sends a "Session Start Request" message to the GGSN.

Step 902: The GGSN returns a "Session Start Response" message to the BM-SC indicating that the session creation fails;

After receiving the "Session Start Request" message, the GGSN cannot establish the MBMS bearer context because the resource is unavailable, and returns a "Session Start Response" message to the BM-SC, indicating that the session creation failed, and the reason value is "The GGSN has no resources available."

Step 903: The BM-SC resends the "Session Start Request" message to the GGSN.

The BM-SC resends the "Session Start Request" message to the GGSN, which may be continuously resent at the set time interval until the session is successfully established with the GGSN, or may be continuously resent within the maximum number of retransmissions that are not exceeded. It is also possible to consider the time interval of resending and the number of retransmissions.

In addition, the GGSN may return a "Session Start Response" message to the BM-SC, indicating that after the session creation fails, if the subsequent discovery finds that a resource is available, the BM-SC is actively notified, and the BM-SC receives the notification and resends the "Session Start Request". "Message. Step 904: The GGSN returns a "Session Start Response" message to the BM-SC indicating that the session is successfully created.

The GGSN, if a resource is available, after receiving the "Session Start Request" message retransmitted by the BM-SC, establishes an MBMS bearer context, stores the relevant attributes of the session and the associated SGSN, and returns a "Session Start Response" message to the BM-SC indicating The session was created successfully.

In this way, when the GGSN is available, the GGSN and the BM-SC can establish a session. This prevents the GGSN from returning a "Session Start Response" message to the BM-SC in the prior art, indicating that there is no corresponding processing flow when the session is created. When the GGSN has resources available subsequently, it can no longer establish a session with the BM-SC.

For the reliable establishment of a session between the SGSN and the BSC/RNC, the principle of establishing a reliable session with the GGSN and the SGSN and between the BM-SC and the GGSN is the same, and will not be described in detail herein.

A person skilled in the art may understand that all or part of the steps of implementing the above embodiments may be completed by a program instructing related hardware, and the program may be stored in a computer readable storage medium. Storage media, such as: ROM/RAM, disk, CD, etc.

The foregoing provides a detailed description of the method for establishing a session in the multimedia broadcast multicast service according to the embodiment of the present invention. Accordingly, the embodiment of the present invention further provides a multimedia broadcast multicast service MBMS network system.

Please refer to FIG. 7, which is a schematic diagram of a structure of a multimedia broadcast multicast service MBMS network system according to an embodiment of the present invention.

As shown, the MBMS network system includes a first network element device 101 and a second network element device 102.

The first network element device 101 is configured to send a request message for establishing a session during a session start of a broadcast or multicast service, and receive a returned response message; if the returned response message indicates that the session is failed due to resource unavailability , then resend the request message to establish a session.

The second network element device 102 is configured to: after receiving the request message for establishing a session sent by the first network element device 101, return a response message to the first network element device 101.

The first network element device 101 includes: a transceiver unit 1011 and a retransmission unit 1012.

The transceiver unit 1011 is configured to send a request message for establishing a session during a session start of a broadcast or multicast service, and receive a returned response message; The resending unit 1012 is configured to: after the response message received by the transceiver unit 1011 indicates that the session fails due to resource unavailability, resend at a set time interval and/or within a maximum number of retransmissions that are not exceeded. Establish a request message for the session.

The second network element device 102 includes: a transceiver unit 1021, a detecting unit 1022, and a processing unit 1023.

The transceiver unit 1021 is configured to receive a request message for establishing a session sent by the first network element device 101, and return a response message to the first network element device 101.

The detecting unit 1022 is configured to detect, after the transceiver unit 1021 receives the request message for establishing a session sent by the first network element device 101, whether the available resource is included.

The processing unit 1023 is configured to: when the detecting unit 1022 detects that no resource is available, record the service information that fails to establish the session, and notify the transceiver unit 1021 to return to the first network element device 101 that the session is failed due to resource unavailability. The response message, and when the detecting unit 1022 subsequently detects that the resource is available, sends a notification message indicating that the resource is available to the first network element device 101.

The transceiver unit 1011 of the first network element device 101 receives the response message returned by the second network element device 102 indicating that the session is failed due to resource unavailability, and subsequently receives the message sent by the second network element device 102. The notification message indicating that the resource is available. At this time, the retransmission unit 1012 of the first network element device 101 resends the request message for establishing a session to the second network element device 102 according to the notification message received by the transceiver unit 1011.

The first network element device 101 is a GPRS gateway support node GGSN, and the second network element device 102 is a GPRS service support node SGSN; or the first network element device 101 is a broadcast multicast service center BM-SC. The second network element device 102 is a GGSN; or the first network element device 101 is an SGSN, and the second network element device 102 is a base station controller BSC/radio network controller RNC.

The first network element device 101 is a GPRS gateway support node GGSN, and when the second network element device 102 is a GPRS service support node SGSN, after the SGSN receives the "MBMS Session Start Request" message sent by the GGSN, because the resource is unavailable, The MBMS bearer context cannot be established, and an "MBMS Session Start Response" message is sent to the GGSN, indicating that the session creation failed, and the reason value is "SGSN has no resources available." The GGSN receives the "MBMS Session Start Response" message returned from the SGSN indicating that the session creation failed, and then delays for a certain period of time and then at a certain time interval. The "MBMS Session Start Request" message is resent to the SGSN to wait for the SGSN to have available resources. Alternatively, the GGSN continuously retransmits within a maximum number of retransmissions that are not exceeded. Of course, it is also possible to consider the time interval of retransmission and the number of retransmissions. In this way, when the SGSN is available, the GGSN and the SGSN can establish an MBMS session. This prevents the SGSN from returning to the GGSN in the "MBMS Session Start Response" in the prior art. The adverse consequences of coming.

The first network element device 101 is a broadcast multicast service center BM-SC. When the second network element device 102 is a GGSN, after the GGSN receives the "Session Start Request" message, the MGSN cannot establish an MBMS bearer because the resource is unavailable. Context, returning a "Session Start Response" message to the BM-SC, indicating that the creation of the session failed, the reason value is "The GGSN has no resources available." The BM-SC receives the "Session Start Response" message returned by the GGSN indicating that the session creation failed, and then resends the Session Start Request message to the GGSN, which may be continuously resent at the set time interval until the session is successfully established with the GGSN. It may be continuously resent within a maximum number of retransmissions that exceeds the set, or it may be a time interval of retransmission and the number of retransmissions.

The first network element device 101 is an SGSN, and the second network element device 102 is a base station controller.

When the BSC/Radio Network Controller RNC, the process of establishing a reliable session between the SGSN and the BSC/RNC is the same as the principle of establishing a reliable session between the GGSN and the SGSN, the BM-SC and the GGSN.

In summary, the method for establishing a session in the MBMS in the prior art is not very reliable. After one network element device sends a request message to another network element device, if the session fails due to resource unavailability, there is no corresponding processing. The process, which may bring a series of problems, the technical solution of the embodiment of the present invention is: in the process of starting the session of the broadcast or multicast service, the sending end sends a request message for establishing a session to the receiving end; receiving the receiving end The returned response message; if the returned response message indicates that the establishment of the session fails due to the resource being unavailable, the transmitting end resends the request message for establishing the session to the receiving end. In this way, when the upstream network element device learns that the establishment of the session fails because the resources of the downstream network element device are unavailable, even if the downstream network element device does not know when the resource is available, it is re-established to the downstream network element device. The request message of the session can ensure that if the downstream network element device has resources available, the two network element devices can establish a session again, so that users in the corresponding network element device area can enjoy the MBMS service. Therefore, the technology of the embodiment of the present invention The solution realizes a reliable establishment of a session in the MBMS, and avoids a series of problems caused by the corresponding processing flow after the failure of establishing a session in the prior art.

Further, in the embodiment of the present invention, when the request message is resent, the message may be continuously retransmitted at a set time interval until the session is successfully established with the GGSN, or may be continuously retransmitted within a maximum number of retransmissions that are not exceeded. It is also possible to consider the time interval of resending and the number of retransmissions. In addition, the request message for establishing a session may be resent after receiving a notification message indicating that the resource is available.

Further, the method for establishing a session in the embodiment of the present invention may be applied between the GGSN and the SGSN, or between the BM-SC and the GGSN, or between the SGSN and the BSC/RNC.

The method and network system for establishing a session in a multimedia broadcast multicast service provided by the embodiment of the present invention are described in detail. For those skilled in the art, according to the idea of the embodiment of the present invention, the specific implementation manner and application There are variations in scope, and the description should not be construed as limiting the invention.

Claims

Rights request

A method for establishing a session in a multimedia broadcast multicast service, comprising: sending a request message for establishing a session to a receiving end;

Receiving a response message returned by the receiving end;

If the returned response message indicates that the establishment of the session fails due to the resource being unavailable, resending the request message for establishing the session to the receiving end; or if the returned response message indicates that the establishment of the session fails, and subsequently receiving the When the receiving end indicates the notification message that the resource is available, the request message for establishing the session is resent to the receiving end.

2. The method for establishing a session in a multimedia broadcast multicast service MBMS according to claim 1, wherein:

Resending the request message for establishing a session to the receiving end at a set time interval; and/or resending the request message for establishing a session to the receiving end within a maximum number of retransmissions that are not exceeded.

The method for establishing a session in the multimedia broadcast multicast service according to claim 1, wherein: the notification message indicating that the resource is available includes a terminal user address and an access point name, and the terminal user address and the connection The in-point name is used to identify the service information that failed to establish a session.

The method for establishing a session in the MBMS of the multimedia broadcast multicast service according to any one of claims 1 to 3, wherein the request message for re-sending the establishment of the session to the receiving end is:

The GPRS gateway support node GGSN resends the MBMS session start request message to the GPRS service support node SGSN; or

The broadcast multicast service center BM-SC resends the session start request message to the GGSN; or, the SGSN resends the MBMS session start request message to the base station controller BSC/radio network controller RNC.

A multimedia broadcast multicast service network system, comprising: a first network element device and a second network element device, wherein:

The first network element device is configured to send a request message for establishing a session, and receive a response message returned by the second network element device; if the returned response message indicates that the session fails due to resource unavailability, resending Establishing a request message for the session; or if the returned response message indicates establishing a session If the notification message of the second network element device indicating that the resource is available is received, the request message for establishing the session is resent to the second network element device;

The second network element device is configured to: after receiving the request message for establishing a session sent by the first network element device, return a response message to the first network element device.

The multimedia broadcast multicast service network system according to claim 5, wherein the first network element device comprises:

a transceiver unit, configured to send a request message for establishing a session, and receive a returned response message; and a retransmission unit, configured to: after the response message received by the transceiver unit indicates that the session fails due to resource unavailability, or in the transceiver unit The received response message indicates that the establishment of the session has failed, and after receiving the notification message indicating that the resource is available, the request message for establishing the session is resent at a set time interval and/or within a set maximum number of retransmissions.

The multimedia broadcast multicast service network system according to claim 5, wherein the second network element device comprises:

a transceiver unit, configured to receive a request message for establishing a session sent by the first network element device, and return a response message to the first network element device;

a detecting unit, configured to detect, after the receiving and receiving unit receives the request message for establishing a session sent by the first network element device, whether the available resource is included;

a processing unit, configured to: when the detecting unit detects that no resource is available, record service information that fails to establish a session, and notify the sending and receiving unit to return, to the first network element device, a response message indicating that the session is failed due to resource unavailability, And when the detecting unit subsequently detects that the resource is available, sending a notification message indicating that the resource is available to the first network element device.

The multimedia broadcast multicast service network system according to any one of claims 5 to 7, characterized in that:

The first network element device is a GPRS gateway support node GGSN, and the second network element device is a GPRS service support node SGSN; or

The first network element device is a broadcast multicast service center BM-SC, and the second network element device is a GGSN; or

The first network element device is an SGSN, and the second network element device is a base station controller BSC/radio network controller RNC.

9. A network element device, comprising:

a transceiver unit, configured to receive a request message for establishing a session;

a detecting unit, configured to detect, after the transceiver unit receives the request message for establishing a session, whether the available resource is included;

a processing unit, configured to: when the detecting unit detects that no resource is available, record service information that fails to establish a session, notify the transceiver unit to send a response message indicating that the session is failed due to resource unavailability, and perform the subsequent detection When the unit detects that a resource is available, it sends a notification message indicating that the resource is available.

The network element device according to claim 9, wherein the network element device is: a GPRS service support node SGSN, or a GPRS gateway support node GGSN, or a base station controller BSC/radio network controller RNC.

11. A network element device, comprising:

a transceiver unit, configured to send a request message for establishing a session, and receive a returned response message; and a retransmission unit, configured to: after the response message received by the transceiver unit indicates that the session fails due to resource unavailability, or in the transceiver unit The received response message indicates that the establishment of the session has failed, and after receiving the notification message indicating that the resource is available, the request message for establishing the session is resent.

The network element device according to claim 11, wherein the retransmission unit is within a set time interval and/or within a set maximum retransmission time.

The network element device according to claim 11 or 12, wherein the network element device is:

The GPRS gateway supports the node GGSN, or the broadcast multicast service center BM-SC, or the GPRS service support node SGSN.