CN1819693B - Method for Notifying MBMS Service on Iu Interface - Google Patents

Abstract

A method for notifying multimedia broadcast and multicast services on an Iu interface, comprising the steps: SGSN decides to send the "MBMS session start" message to RNC; SGSN organizes the "MBMS session start" message, if SGSN supports RA screening, all RAs There is a UE in idle mode to join this MBMS service, then the number of "RA list of idle mode UE" in the SGSN setting message is a specific value; RNC receives the "MBMS session start" message, if "RA list of idle mode UE" in the message The number of "list" is an agreed specific value, and the RNC knows that there are UEs joining the MBMS service in idle mode in all RAs. The invention enables the RNC to have a correct processing flow, simplifies the processing in the RNC, and reduces the load of the Iu interface.

Description

Method for Notifying MBMS Service on Iu Interface

technical field

The present invention relates to mobile communications, in particular to notification of multimedia broadcast and multicast services at the Iu interface (the interface between the core network and the radio network controller (hereinafter referred to as RNC)) in a wideband code division multiple access (hereinafter referred to as WCDMA) mobile communication system (hereinafter referred to as MBMS) method.

Background technique

Multimedia Broadcast and Multicast Service (hereinafter referred to as MBMS) is a new service being standardized by the Third Generation Partnership Project (hereinafter referred to as 3GPP). The MBMS service is a one-way point-to-multipoint service. The biggest feature of this service is that it can effectively utilize wireless resources and network resources.

Figure 1 describes the system structure of MBMS. The MBMS network structure is based on the general packet radio service (referred to as GPRS) core network, and a new network unit is added. The following is a description of the MBMS system structure in FIG. 1 .

101 The broadcast and multicast service center (BM-SC for short) is the service control center of the MBMS system. 102 Gateway GPRS Support Node (GGSN for short) and 103 Serving GPRS Support Node (SGSN for short) constitute a transmission network for MBMS services and provide routes for data transmission. 104 The UMTS Terrestrial Radio Access Network (abbreviated as UTRAN) provides radio resources for MBMS services on the air interface. 105 User equipment (UE for short) is a terminal device for receiving data. 106 The Home Location Register (HLR for short) saves data related to the user and can provide services such as user authentication. 107Uu is a wireless interface, and 108Iu is an interface between an access network and a core network. The Iu resource used by the MBMS service is not dedicated to the user, but shared by all users of the service.

The process of starting an existing MBMS session is shown in FIG. 2 .

201 SGSN sends "MBMS session start" message to RNC to request RNC to notify UE that MBMS session starts, and establish Iu signaling connection and Iu user plane bearer if necessary. The message includes the service area corresponding to the MBMS service. If the SGSN supports routing area (hereinafter referred to as RA) screening, the message also includes "RA list of interested UEs in idle mode". The SGSN may also not support RA screening, so the "RA List of Interested UEs in Idle Mode" in the "MBMS Session Start" message does not exist.

202 The RNC receives a "MBMS Session Start" message.

When at least one of the following two conditions is met, the RNC starts to allocate the requested RAB resources for this MBMS service:

1) When the RNC controls at least one cell belonging to the MBMS service area, and the MBMS session start message contains the RA list of the idle mode UE, at least one RA belonging to the RNC is included in the list.

2) For the UE served by the RNC, the UE uses the radio resources of the cell belonging to the MBMS service area.

If the MBMS session start message contains the RA list of the idle mode UE, but the above two conditions are not satisfied, the RNC will not establish an RAB for this MBMS service until the RA list of the idle mode UE is updated or the UE is connected. The RAB is established for this MBMS service. In this case, the RNC immediately sends a "MBMS Session Response" to the SGSN with the reason "Successful MBMS session start, no data bearer required".

If the Non-Access Stratum (hereinafter referred to as NAS) node selection function (hereinafter referred to as NNSF) is activated, the RNC may receive "MBMS session start" messages from multiple SGSNs. If the RNC decides to establish the requested RAB, the RNC only Establish an MBMS Iu bearer, and send the "MBMS Session Start Response" message to the selected SGSN. The message contains the "Transport Layer Address" and "Iu Transport Relationship".

If the RNC receives "MBMS session start" messages from multiple SGSNs, each "MBMS session start" message includes the "RA list where the idle mode UE is located". If RNC supports it, RNC establishes and maintains Iu signaling connections with all SGSNs, and sends a "MBMS Session Start Response" message to each SGSN, with the reason being "Successful MBMS session start, no data bearer required". If the RNC decides to establish a RAB for one of the SGSNs, the reason for the RNC to send a response message to this RNC is successful RAB establishment.

If NNSF is activated, RNC receives "MBMS session start" messages from multiple SGSNs, not all "MBMS session start" messages contain "RA list where UE in idle mode resides". The RNC sends a "MBMS Session Start Failed" message to each SGSN (except the SGSN for which the RNC confirms the successful RAB establishment with the "MBMS Session Start Response"), with the cause value being "MBMS-superseded due to NNSF".

The existing MBMS session update process is shown in FIG. 3 .

301 When the MBMS session is in progress, the SGSN sends an "MBMS Session Update" message to the RNC to notify the RNC that the "RA list where the UE in idle mode resides" has changed compared with the previous sending. The message includes "the RA list where the UE in the idle mode is changed".

302 RNC receives the "MBMS Session Update" message.

If the MBMS RAB has been established, assuming that the RNC controls at least one such cell: in the MBMS service area, and the RA in which the cell is located is included in the "added RA list" (if this information element is included in the "changed idle mode UE's RA List"). The RNC starts to allocate additional MBMS radio resources for this MBMS RAB. If the "RA list to be deleted" is included in the "RA list where the idle mode UE is changed", the RNC may release the MBMS radio resources allocated by the cells in these RAs.

If the MBMS RAB has not been established, assuming that the RNC controls at least one such cell: in the MBMS service area, and the RA where the cell is located is included in the "added RA list" (if this information element is included in the "changed idle mode UE is located list of RAs"). RNC starts to establish MBMS RAB. If the above conditions are not satisfied, the RNC may wait until the next update of the RA list where the UE in idle mode resides or the UE is connected before establishing the RAB for the MBMS service.

When the MBMS RAB is successfully established, the RNC includes the "transport layer address" and "Iu transport relationship" in the "MBMS session update response" message.

After the RA list where the UE in idle mode is located is successfully updated, the RNC sends a "MBMS Session Update Response" message through the SGSN.

When the RNC cannot process the request correctly, for example, no resource of any cell can be established, the RNC sends a "MBMS session update failure" message to notify the SGSN.

It can be seen from the above prior art that the RNC operates differently on cells that belong to the RA list and cells that do not belong to the RA list. Therefore, only when the RNC can accurately know whether the SGSN supports RA screening and which RAs have idle mode UEs under the condition that the SGSN supports RA screening, can the RNC make correct processing.

(1) For such a situation: when the MBMS session starts, there are idle mode UEs in all RAs included in the SGSN, and the SGSN needs to include all RAs in the "RA list where the idle mode UEs are located". After receiving this message, RNC needs to check which cells are in these RAs, and notify MBMS service, count, establish radio bearer (hereinafter referred to as RB) and other operations in these cells. Including all RA lists in the "MBMS Session Start" message results in a waste of Iu interface resources. And after receiving this message, the RNC needs to check which cells belong to these RAs, which makes the RNC's processing complex and slow. The same problem exists for the "MBMS Session Update" procedure.

(2) At present, there are two cases where SGSN supports RA screening and SGSN does not support RA screening. When SGSN does not support RA screening, the "RA list where UE in idle mode" does not exist in the "MBMS session start" message. When the SGSN supports RA screening, but there are no idle mode UEs in all RAs, the "RA list of idle mode UEs" in the message does not exist. How to distinguish these two cases needs to be clearly specified in the specification.

Contents of the invention

The object of the present invention is to provide a method for notifying MBMS services on the Iu interface, and solve the above-mentioned existing problems by specifying some values of information elements in existing messages and adding new information elements in existing messages.

According to one aspect of the present invention, a method for notifying multimedia broadcast and multicast services at an Iu interface comprises the steps of:

The SGSN decides to send the "MBMS session start" message to the RNC, which contains the information element "RA indication";

RNC receives the "MBMS session start" message;

If the "RA indication" in the "MBMS session start" message is the corresponding value, the RNC knows that there are UEs joining the MBMS service in idle mode in all RAs, and the RNC allocates the requested RAB resource for this MBMS service.

According to another aspect of the present invention, a method for notifying multimedia broadcast and multicast services at an Iu interface comprises the steps of:

1) The SGSN decides to send the "MBMS session start" message to the RNC, and the message contains the information element "RA indication";

2) RNC receives the "MBMS session start" message;

3) If the "RA indication" in the "MBMS session start" message is a corresponding value, the RNC knows that there is no UE in idle mode joining the MBMS service in all RAs.

The invention enables the RNC to have a correct processing flow, simplifies the processing in the RNC, and reduces the load of the Iu interface.

Description of drawings

Fig. 1 is the logic network equipment figure of MBMS business;

Fig. 2 is the MBMS session initiation procedure of prior art;

Fig. 3 is the MBMS session updating process of the prior art;

Fig. 4 is the method for the first kind of SGSN notifying RNC RA state;

Fig. 5 is the method for second kind of SGSN notifying RNC RA status;

Fig. 6 is the method for new Iu interface notification MBMS service, the operation process of SGSN;

Fig. 7 is the method for notifying the MBMS service of the new Iu interface, and the operation flow of the RNC.

Detailed ways

Two methods are given in the present invention so that SGSN can inform RNC whether all RAs have idle mode UEs interested in MBMS services and all RAs have no idle mode UEs.

The above-mentioned process is illustrated with diagrams, and the working process of nodes (including SGSN and RNC) is also illustrated with flow charts.

Figure 4 is a method for the SGSN to notify the RNC whether all RAs have UEs that join the MBMS service in idle mode and there are no such UEs in all RAs. That is, through the agreement on the value of the "RA list where UEs in idle mode are located" To complete this function. Through this process, the RNC can know the correct information of the RA where the idle mode UE is located, so that the RNC has a correct processing flow and simplifies the processing of the RNC.

401a SGSN sends "MBMS session start" message to RNC to request RNC to notify UE that MBMS session starts, and establish Iu signaling connection and Iu user plane bearer if necessary.

If the SGSN does not support RA screening, the RA list information in the "MBMS Session Start" message does not exist.

If the SGSN supports routing area (hereinafter referred to as RA) screening, the message also includes an information element "RA list of interested UEs in idle mode". When there are UEs in idle mode joining the MBMS service in all RAs of the SGSN, the simple method for the SGSN to notify the RNC of this information is to set the number of RAs to a specific value for the SGSN, and one of the methods is to set the number of RAs The number is equal to the maximum number of MBMS RAs. In this case, each subsequent routing area code (hereinafter referred to as RAC) is omitted. When there are no UEs joining the MBMS service and in idle mode in all RAs of the SGSN, the SGSN also sets the number of RAs to a specific value. One method is to set the number of RAs to 0, and the subsequent RACs do not exist.

402a RNC receives the "MBMS Session Start" message. When the "RA list of interested UEs in idle mode" does not exist in the "MBMS session start" message, the SGSN does not support RA screening; when there is RA list information in the "MBMS session start" message, if the number of RAs is equal to the indication All RAs of the SGSN have specific values of UEs joining the MBMS service and in idle mode, such as the maximum number of MBMS RAs, the RNC can know that there may be UEs joining the MBMS service in idle mode in all cells. If the number of RAs is equal to a specific value indicating that all RAs of the SGSN have UEs that do not join the MBMS service and are in idle mode, such as 0, the RNC can know that there are no UEs that join the MBMS service in idle mode in all cells . Subsequent operations of the RNC are the same as in the prior art. For example, if at least one condition in 202 is satisfied, the RNC starts to allocate the requested RAB resource for this MBMS service. The RNC notifies the UE in each cell, and performs counting and the like in a cell where the PTM transmission mode cannot be determined. The mechanism of RNC allocating MBMS RAB resource, and sending response message (including setting of success and failure and cause value) is the same as existing. Detailed technical content is ignored here.

When the NNSF is activated, the RNC knows through the specific value in the "MBMS session start" message from each SGSN whether there are UEs in idle mode joining this MBMS service in all RAs of the SGSN, or whether there are UEs in all RAs of the SGSN For the UE in the idle mode that does not join the MBMS service, the processing of the RNC is the same as the existing process, and the processing mechanism of the RNC in the case of NNSF activation is also the same as the existing counting. Detailed counting content is ignored here.

401b If the SGSN supports RA screening, when the MBMS session is in progress, the SGSN sends the "MBMS Session Update" message to the RNC to notify the RNC that the "RA list where the UE in idle mode is located" has changed compared with the previous sending. The message includes "the RA list where the UE in the idle mode is changed". If the RA list changes so that there are UEs interested in idle mode in all RAs, the SGSN notifies the RNC through a specific value in the message. One method is to set the number of "new RAs in idle mode" to the maximum Number of MBMS RAs. In this case, the RAC list is omitted. If the RA list changes so that there are no UEs interested in idle mode in all RAs, the SGSN notifies the RNC through a specific value in the message, one of which is to set the number of "RAs that no longer have idle mode UEs" to 0 , RAC does not exist.

402b RNC receives the "MBMS session update" message. If the specific value in the message indicates that there are UEs interested in idle mode in all RAs, for example, when the number of "new RA in idle mode" is the maximum number of MBMS RAs, RNC directly checks the new RA Whether there is a cell in the MBMS service area, if so, if the MBMS RAB has been established, the RNC allocates another MBMS radio resource for this MBMS RAB; if the MBMS RAB is not established, the RNC starts to establish the MBMS RAB. If the above conditions are not satisfied, the RNC may wait until the next update of the RA list where the UE in idle mode resides or the UE is connected before establishing the RAB for the MBMS service. When the MBMS RAB is successfully established, the RNC includes the "Transport Layer Address" and "Iu Transport Relationship" in the "MBMS Session Update Response" message.

If the specific value in the "MBMS Session Update" message indicates that there are no UEs interested in idle mode in all RAs, for example, when the number of "new RAs in idle mode" is 0, the RNC knows that there are UEs in all cells With no interested UEs in idle mode, the RNC may release MBMS radio resources existing in the cells belonging to these RAs, eg if there are no UEs in radio resource connected mode (hereinafter referred to as RRC connected mode) in these cells either.

After the RA list where the UE in idle mode is located is successfully updated, the RNC sends a "MBMS Session Update Response" message through the SGSN.

When the RNC cannot process the request correctly, for example, no resource of any cell can be established, the RNC sends a "MBMS session update failure" message to notify the SGSN.

Fig. 5 is another method for SGSN to notify RNC whether all RAs have UEs interested in MBMS services in idle mode and all RAs do not have such UEs. That is, this function is accomplished by adding new information elements to existing messages. Through this process, the RNC can know the correct information of the RA where the idle mode UE is located, so that the RNC has a correct processing flow and simplifies the processing of the RNC.

501a SGSN sends "MBMS session start" message to RNC to request RNC to notify UE that MBMS session starts, and establish Iu signaling connection and Iu user plane bearer if necessary. The information element "RA indication" is added to this message, and the "RA indication" information element is optional.

If the SGSN does not support RA screening, the RA list information and the "RA indication" in the "MBMS session start" message do not exist.

If the SGSN supports routing area (hereinafter referred to as RA) screening, the message also includes an information element "RA list of UEs in idle mode that join this MBMS service". When there are UEs in idle mode joining the MBMS service in all RAs of the SGSN, the SGSN sets the "RA indication" information element to a corresponding value, for example, 1, and sets "there are RAs of interested UEs in idle mode list" does not exist. When there are no UEs joining the MBMS service and in idle mode in all RAs of the SGSN, similarly, the SGSN sets the "RA indication" to a corresponding value, such as 0, and sets the "RA list of interested UEs in idle mode" to does not exist. In other cases, the information element "RA indication" does not exist, and the SGSN sets the number of RAs and the RAC list in which the UE in the idle mode joins the MBMS service. The SGSN can also use two information elements to indicate the above two situations respectively. For example, if the information element "RA list of empty idle mode UE" is set to "empty list", it indicates that all RAs of the SGSN have not joined this MBMS service and are in UE in idle mode. The information element "RA list of all idle mode UEs" is set to "full list" to indicate that all RAs of the SGSN have UEs joining the MBMS service and in idle mode. Both information elements are optional.

502a The RNC receives the "MBMS session start" message. If neither the "RA indication" nor the "RA list of interested UEs in idle mode" exists in the message, the SGSN does not support RA screening. If the "MBMS session start" message contains "RA Indication" exists, and RNC knows according to the value of the information element "RA Indication" in the message whether there are UEs in all RAs of the SGSN that join this MBMS service and are in idle mode, for example, the value of "RA Indication" is 1; or whether the SGSN All RA UEs that do not join the MBMS service and are in idle mode, for example, the value of "RA Indication" is 0. When the corresponding SGSN uses two information elements to indicate the above two situations, the RNC uses the "empty idle mode UE Whether there are RA list of all idle mode UEs" and "RA list of all idle mode UEs" and their values are used to determine whether there are UEs joining this MBMS service in all RAs of SGSN, or whether all RAs of SGSN have not joined this MBMS service Subsequent operations of the MBMS service and UE.RNC in idle mode are the same as in the prior art. For example, if at least one condition in 202 is met, the RNC starts to allocate the requested RAB resource for this MBMS service. The RNC notifies the UE in each cell, Counting, etc. in the cell where the PTM transmission mode cannot be determined. The detailed technical content is ignored here.

When the NNSF is activated, the RNC knows whether there are UEs in idle mode joining the MBMS service in all RAs of the SGSN through whether the "RA indication" in the "MBMS session start" message from each SGSN exists and the corresponding value , for example, the value of "RA indication" is 1; or whether there is no UE joining the MBMS service and in idle mode in all RAs of the SGSN, for example, the value of "RA indication" is 0. The processing of the RNC is then the same as the existing procedure. Detailed technical content is ignored here.

501b If the SGSN supports RA screening, when the MBMS session is in progress, the SGSN sends the "MBMS Session Update" message to the RNC to notify the RNC that the "RA list where the UE in idle mode is located" has changed compared with the previous sending. The information element "RA indication" is added to this message, and the "RA indication" information element is optional. If the RA list where the UE of interest in idle mode is located changes to include UEs in all RAs of the SGSN, the SGSN sets the information element "RA Indication" to a corresponding value, such as 1, and sets the "RA list" does not exist. If the RA list where the UE of interest in idle mode is located changes so that there is no UE in all RAs, the SGSN sets the information element "RA Indication" to a corresponding value, such as 0, and sets the "RA list" does not exist. In other cases, set "RA Indication" to not exist. The SGSN sets the added RA list and the deleted RA list in the "RA list of the changed UE in idle mode". SGSN can also use two information elements to indicate the above two situations respectively. For example, if the information element "RA list of empty idle mode UE" is set to "empty list", it indicates that all RAs of SGSN have not joined this MBMS service and UE in idle mode. The information element "RA list of all idle mode UEs" is set to "full list" to indicate that there are UEs joining the MBMS service and in idle mode in all RAs of the SGSN. Both information elements are optional.

502b RNC receives the "MBMS session update" message. If the "RA Indication" in the "MBMS Session Update" message exists, the RNC knows whether there are UEs in idle mode joining the MBMS service in all RAs of the SGSN according to the value of the information element "RA Indication" in the message, for example, the "RA Indication" " has a value of 1. RNC directly checks whether there is a cell in the MBMS service area in the new RA. If there is, if the MBMS RAB has been established, the RNC allocates another MBMS radio resource for this MBMS RAB; if the MBMS RAB has not been established, the RNC Start building MBMS RAB. If the above conditions are not satisfied, the RNC may wait until the next update of the RA list where the UE in idle mode resides or the UE is connected before establishing the RAB for the MBMS service. When the MBMS RAB is successfully established, the RNC includes the "transport layer address" and "Iu transport relationship" in the "MBMS session update response" message.

If the "RA indication" in the "MBMS session update" message exists, the RNC will know whether there is no UE in idle mode joining the MBMS service in all RAs of the SGSN according to the value of the information element "RA indication" in the message, such as "RA indication" has a value of 0. The RNC may release MBMS radio resources present in the cells belonging to these RAs, for example if there are no RRC connected mode UEs in these cells as well.

When the corresponding SGSN uses two information elements to indicate the above two situations, the RNC determines whether the SGSN has all RAs according to whether the "RA list of empty idle mode UEs" and "RA list of all idle mode UEs" exist and their values There are UEs that join the MBMS service and are in the idle mode in all RAs of the SGSN, or whether there are no UEs that join the MBMS service and are in the idle mode in all RAs of the SGSN.

After the RA list where the UE in the idle mode is located is successfully updated, the RNC sends a "MBMS Session Update Response" message through the SGSN.

When the RNC cannot process the request correctly, for example, no resource of any cell can be established, the RNC sends a "MBMS session update failure" message to notify the SGSN.

Example

FIG. 6 is a new method for notifying MBMS services on the Iu interface proposed by the present invention, and an operation flow of the SGSN.

601 SGSN receives the message.

602 If the SGSN receives the "MBMS session start request" message from the GGSN, 603 the SGSN saves the attributes of the service, sets the status of the MBMS bearer service as "activated", and the SGSN sends the "MBMS session start response" message to the GGSN.

604 The SGSN organizes the "MBMS session start" message to the RNC. If the SGSN does not support RA screening, the "RA list where the idle mode UE resides" does not exist.

If SGSN supports RA screening, when all RAs have UEs that join this MBMS service and are in idle mode, corresponding to the first method proposed by the present invention, SGSN sets the number of RAs in the "RA list where idle mode UEs are located" as Specific value, one of the methods is to set the number of RAs in the "RA list where the idle mode UE is located" to the maximum number of MBMS RAs, and omit the RAC corresponding to each RA. Corresponding to the second method proposed by the present invention, the SGSN sets the "RA indication" to a corresponding value, such as 1, and sets the "RA list where the UE in idle mode" does not exist.

If the SGSN supports RA screening, when there are no UEs joining the MBMS service and in idle mode in all RAs, corresponding to the first method proposed by the present invention, the SGSN sets the number of RAs to a specific value, such as 0 to indicate There is no UE in idle mode in any RA, and the RAC corresponding to the RA does not exist. Corresponding to the second method proposed by the present invention, the SGSN sets the "RA indication" to a corresponding value, such as 0, and sets the "RA list where the UE in idle mode" does not exist.

If the SGSN supports RA screening, corresponding to the second method proposed by the present invention, the SGSN can also use two information elements to indicate the above two situations respectively, such as the information element "RA list of empty idle mode UE" is set to "empty list " to indicate that there are no UEs joining this MBMS service and in idle mode in all RAs of the SGSN. The information element "RA list of all idle mode UEs" is set to "full list" to indicate that all RAs of the SGSN have UEs joining the MBMS service and in idle mode. Both information elements are optional.

In addition to these two cases, if the SGSN supports RA screening, the SGSN sets the number of RAs and each RAC in the "RA list where the UE in idle mode resides". Corresponding to the second method proposed by the present invention, the setting "RA indication" does not exist.

605 SGSN sends "MBMS Session Start" message to RNC.

Fig. 7 is the method for notifying MBMS service of the new Iu interface proposed by the present invention, and the operation flow of RNC.

701 RNC receives the message.

702 If the RNC receives the "MBMS session start" message from the SGSN, 703 the RNC saves the service attributes and sets the service status.

704 corresponds to the first method of the present invention. When the "RA list of interested UEs in idle mode" does not exist in the "MBMS session start" message, the SGSN does not support RA screening; In some cases, SGSN supports RA screening. If the number of RAs in the "RA list where UEs in idle mode are located" is a specific value, such as the maximum number of MBMS RAs, RNC knows that there are UEs in idle mode in all RAs. If the number of RAs in the "RA list of idle mode UEs" is a specific value, such as 0, the RNC knows that there is no idle mode UE in all RAs. If at least one condition in 202 is met, the RNC starts to allocate the requested RAB resource for this MBMS service. The RNC notifies the UE in each cell, and performs counting and the like in a cell where the PTM transmission mode cannot be determined.

When the NNSF is activated, the RNC knows whether all the RAs of the SGSN have joined the MBMS service through the specific value of the number of RAs in the "RA list where the idle mode UE is located" in the "MBMS session start" message from each SGSN. The UE in idle mode, or whether there is no UE in idle mode in all RAs of the SGSN to join the MBMS service, then the processing of the RNC is the same as the existing process. The detailed technical content is ignored here.

Corresponding to the second method of the present invention, if neither the "RA list of idle mode UE" nor the "RA indication" in the "MBMS session start" message exists, the SGSN does not support RA screening. If the "RA indication" exists or the "RA list of idle mode UE" exists, the SGSN supports RA screening. Through the corresponding value of "RA Indication", eg 1, the RNC knows that there are UEs in idle mode in all RAs. Through the corresponding value of "RA indication", eg 0, the RNC knows that there is no UE in idle mode in all RAs. If the "RA indication" does not exist, the RNC knows that there is an RA list for the idle mode UE according to the number of RAs in the "RA list where the idle mode UE resides" and the values of each RAC. When the corresponding SGSN uses two information elements to indicate the above two situations, the RNC determines whether the SGSN has all RAs according to whether the "RA list of empty idle mode UEs" and "RA list of all idle mode UEs" exist and their values There are UEs that join the MBMS service and are in the idle mode in all RAs of the SGSN, or whether there are no UEs that join the MBMS service and are in the idle mode in all RAs of the SGSN. Then the operation of the RNC is the same as that of the prior art, and the detailed technical content is omitted here.

Here, the operation flow of the SGSN and the RNC is described by taking the beginning of the MBMS session as an example. When the SGSN supports RA screening, for the MBMS session update process, for the case where there are interested idle-mode UEs in all RAs and no interested idle-mode UEs in all RAs, the processing of the SGSN and RNC is related to the MBMS session Same at the start. That is: corresponding to the first method proposed by the present invention, if there are interested UEs in idle mode in all RAs, the SGSN sets the number of RAs in the "increased RA list" in the "RA list of changed idle mode UEs" One of the methods is to set it as the maximum number of MBMS RAs and omit each RAC; if there is no interested UE in idle mode in all RAs, the SGSN sets "the RA of the idle mode UE to be changed" The number of RAs in "Deleted RA List" in "List" is 0, and the RAC does not exist. Except for these two cases, the SGSN shall provide a list of added or deleted RACs. The RNC parses the "RA list where the UE in idle mode is changed" according to the same rule. Corresponding to the second method proposed by the present invention, if there are interested UEs in idle mode in all RAs, the SGSN sets the "RA indication" to a corresponding value, such as 1, and sets the "RA list of the changed idle mode UEs" does not exist. If there is no interested UE in idle mode in all RAs, SGSN sets "RA indication" to a corresponding value, such as 0, and sets "RA list of changed idle mode UEs" to not exist. Except for these two cases, the SGSN sets "RA indication" does not exist, giving a list of added or deleted RACs. SGSN can also use two information elements to indicate the above two situations respectively. For example, if the information element "RA list of empty idle mode UE" is set to "empty list", it indicates that all RAs of SGSN have not joined this MBMS service and UE in idle mode. The information element "RA list of all idle mode UEs" is set to "full list" to indicate that there are UEs joining the MBMS service and in idle mode in all RAs of the SGSN. Both information elements are optional. The RNC parses the "RA list where the UE in idle mode is changed" according to the same rule.

Claims (6)

1. method at Iu interface notice multimedia broadcasting and multicast service comprises step:

1) the SGSN decision sends " the MBMS session begins " message and gives RNC, comprises information element " RA indication " in the described message;

2) RNC receives " the MBMS session begins " message;

3) if " RA indication " is corresponding value in " the MBMS session begins " message, RNC knows the UE of this MBMS business of adding that idle pulley is arranged among all RA, and RNC is the RAB resource of MBMS traffic assignments request for this reason.

2. method according to claim 1 is characterized in that: the value 1 of the professional UE of this MBMS of the adding that is used for indicating all RA that idle pulley is all arranged " RA indication ".

3. method according to claim 1, it is characterized in that also comprising if SGSN supports the RA screening, the professional UE of this MBMS of adding that idle pulley is arranged among all RA, SGSN are provided with that " RA indication " is corresponding value in the message, and setting " RA of idle pulley UE tabulates " is not for existing.

4. method at Iu interface notice multimedia broadcasting and multicast service comprises step:

1) the SGSN decision sends " the MBMS session begins " message and gives RNC, comprises information element " RA indication " in the described message;

2) RNC receives " the MBMS session begins " message;

3) if " RA indication " is corresponding value in " the MBMS session begins " message, RNC knows the UE of this MBMS business of adding that does not have idle pulley among all RA.

5. method according to claim 4 is characterized in that: the value 0 of the professional UE of this MBMS of the adding that is used for indicating all RA all not have idle pulley " RA indication ".

6. method according to claim 4, it is characterized in that also comprising if SGSN supports the RA screening, the professional UE of this MBMS of adding that does not have idle pulley among all RA, SGSN are provided with that " RA indication " is corresponding value in the message, and setting " idle pulley UE place RA tabulation " is not for existing.

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