CN100450280C - Method for user equipment to release point-to-multipoint radio bearer - Google Patents

Abstract

The invention discloses a method for user equipment to release point-to-multipoint radio bearers in multimedia broadcast/multicast services. UE periodically receives control information of MBMS services. The method includes the following steps: A. UE judges whether the If the control information of the MBMS service is not obtained successfully, then step B is performed; otherwise, the operation is performed according to the content of the control information; B. The UE releases the PTM radio bearer of the MBMS service. Applying the method of the invention can avoid the situation that the UE keeps the PTM radio bearer and releases the PTM radio bearer by mistake, improves the accuracy of the UE releasing the PTM radio bearer, and can reduce the error of the UE receiving the MBMS service and the waste of system resources.

Description

Method for user equipment to release point-to-multipoint radio bearer

technical field

The present invention relates to a method for a user equipment (UE) to release a radio bearer in a multimedia broadcast/multicast service (MBMS), in particular to a method for a UE to release a point-to-multipoint (PTM) radio bearer.

Background technique

Multicasting and broadcasting are techniques for delivering data from one source to multiple destinations. In traditional mobile networks, Cell Broadcast Service (CBS: Cell Broadcast Service) allows low bit rate data to be sent to all users through the shared broadcast channel of the cell, which belongs to the message service.

Now, people's demand for mobile communication is no longer satisfied with telephone and message services. With the rapid development of the Internet, a large number of multimedia services have emerged, some of which require multiple users to receive the same data at the same time, such as video on demand, TV, etc. Broadcasting, video conferencing, online education, interactive games, etc. Compared with general data, these mobile multimedia services have the characteristics of large data volume, long duration, and delay sensitivity. The current IP multicast technology is only applicable to wired IP networks, but not to mobile networks, because mobile networks have specific network structures, functional entities and wireless interfaces, which are different from wired IP networks.

In order to effectively utilize mobile network resources, WCDMA/GSM global standardization organization 3GPP proposed multicast and broadcast services (MBMS: Multimedia Broadcast/Multicast Service), which provides a data source in a mobile network to send data to multiple users. point services, realize network resource sharing, and improve the utilization rate of network resources, especially the utilization rate of air interface resources. The MBMS defined by 3GPP can not only realize plain text and low-rate message multicast and broadcast, but also realize multicast and broadcast of high-speed multimedia services, which undoubtedly conforms to the trend of future mobile data development.

In order to support MBMS services, a new mobile network functional entity--broadcast and multicast service center BM-SC is added to the mobile network. It is the entrance of the content provider and is used to authorize and initiate Time plan for delivery of MBMS content. In addition, functional entities such as user equipment (UE), terrestrial radio access network (UTRAN), GERAN, SGSN, and GGSN are enhanced, adding MBMS-related functions.

Refer to FIG. 1 for such a network structure, which is a schematic structural diagram of a wireless network supporting multicast/broadcast services. Among them, the Broadcast/Multicast Service Center (BM-SC) is connected to the Gateway General Packet Radio Service (GPRS) Support Node (GGSN, Gateway GPRS SupportNode) through the Gmb interface or the Gi interface, and one BM-SC can be connected to multiple GGSNs; The GGSN is connected to the Serving GPRS Support Node (SGSN, Serving GPRS Support Node) through the Gn/Gp interface, and one GGSN can be connected to multiple SGSNs; the SGSN can be connected to the Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (UTRAN) through the Iu interface ), then the UTRAN is connected to the communication terminal through the Uu interface, and the SGSN can also be connected to the Global System for Mobile Communications (GSM) Enhanced Radio Access Network (GERAN) through the Iu/Gb interface, and then GERAN is connected to the communication terminal through the Um interface.

MBMS includes multicast mode and broadcast mode. The difference between the multicast service and the broadcast service is only that: the multicast service only sends corresponding information to users who have subscribed to certain information, while the broadcast service sends information to all users in the wireless network. The multicast mode requires the user to sign up for the corresponding multicast group, activate the service, and generate corresponding billing information. Since the multicast and broadcast modes have different business requirements, their business processes are also different.

There are two modes when MBMS services are transmitted between UTRAN and UE: point-to-multipoint (PTM) mode and point-to-point (PTP) mode. The PTM mode sends the same data through the MBMS point-to-multipoint service channel (MTCH), and all UEs that join the multicast service or are interested in the broadcast service can receive it; the PTP mode sends data through the dedicated transport channel (DTCH), and only the corresponding One UE can receive.

Refer to Figure 2 for the complete flow of a user receiving an MBMS broadcast service. As shown in Figure 2, the flow includes: Service announcement, Session Start, MBMS notification, Data transfer ), session end (Session Stop) process.

Among them, the Service announcement process is used for the BM-SC to announce the services that can be provided currently.

During the Session Start process, the BM-SC is ready for data transmission and notifies the network to establish the bearer resources of the corresponding core network (CN) and universal terrestrial radio access network (UTRAN).

The MBMS notification process is used to notify the UE that the MBMS multicast session is about to start.

During the data transfer process, the BM-SC transmits data to the UE through the bearer resources established during the session start process.

The Session Stop process is used to release the bearer resources established by the Session Start process.

In the broadcast service, each MBMS service node stores the bearer context of the MBMS service, and the bearer context is activated during the Session Start process and deactivated during the Session Stop process.

Refer to Figure 3 for the complete flow of a user receiving an MBMS multicast service. As shown in Figure 3, the flow includes: Subscription, Service announcement, Joining, Session Start, MBMS Notification (MBMS notification), data transfer (Data transfer), session end (Session Stop) and leaving (Leaving) process.

Wherein, the Subscription process is used to allow the user to pre-subscribe the desired MBMS service.

The Service announcement process is used by the BM-SC to announce the currently available services.

The Joining process is the MBMS multicast service activation process. During the Joining process, the UE notifies the network that it is willing to become a member of the current multicast group and receive the multicast data of the corresponding service. Create MBMS UE context for recording UE information.

During the Session Start process, the BM-SC is ready for data transmission and notifies the network to establish the bearer resources of the corresponding CN and UTRAN.

The MBMS notification process is used to notify the UE that the MBMS multicast session is about to start.

During the data transfer process, the BM-SC transmits data to the UE through the bearer resources established during the session start process.

The Session Stop process is used to release the bearer resources established by the Session Start process.

The Leaving process causes subscribers in the group to leave the multicast group, that is, the user no longer receives multicast data, and this process will delete the corresponding MBMS UE context.

Referring to FIG. 4, FIG. 4 is a schematic diagram of a scheduling cycle of MCCH information. The entire MCCH information is periodically transmitted on a "repetition period" basis. "Modification period" is defined as an integer multiple of "repeat period". MBMS AccessInformation is transmitted periodically based on the "Access Information Period". At the same time, the "repeat period" is an integer multiple of the "access information period".

The RRC messages carried on the MCCH mainly include: MBMS Access Information (MAI), MBMS Modified Services Information (MSI), changed RB Configuration Information (Changed RB Configuration Information), MBMS non-modified service information (MBMS Unmodified Services Information), non-changing RB configuration information (Unchanged RB Configuration Information) and so on.

Among them, information such as MBMS Modified Services Information is key information that does not change during a modification cycle, while access information such as MBMS Access Information can be changed at any time.

In the above-mentioned session start (Session Start) step, UTRAN will perform a counting (Counting) operation to determine which radio bearer mode of the air interface to use. In the MBMS system, there are two wireless bearer modes: point-to-point (PTP) and point-to-multipoint (PTM). To put it simply, point-to-point means that the network transmits MBMS services to users through dedicated channels, while point-to-multipoint means that the network transmits MBMS service information to users through public channels.

In the above session end (Session Stop) step, in order to save resources, UTRAN and UE will release the radio bearer (RB). For the point-to-point RB, the UTRAN notifies the UE through dedicated signaling, and this process is the same as that of the existing R99 system. But for the point-to-multipoint UE, it is necessary to notify the UE through signaling on the common control channel. In the MBMS system, the common control channel is the MCCH. When the UE starts to receive MBMS service data, it receives the MCCH periodically. The control information for releasing the PTM RB is transmitted in the Modified Service Information message transmitted on the MCCH.

In the existing protocol, the UTRAN instructs the UE on the control channel to release the radio bearer in two cases: point-to-point and point-to-multipoint. The release process of the point-to-point (PTP) RB is the same as the existing R99 process, and it is not an improvement of the present invention, so it will not be described in detail here. The following description is mainly aimed at the situation of point-to-multipoint (PTM) RB release, and the release process includes the following steps:

1. UTRAN gets the Session stop command from CN;

2. In the MBMS Modified Services Information (MSI) message on the MCCH channel, the UTRAN notifies the UE of the need to release the indication information of the service RB, and this information is only transmitted once;

3. After receiving the information, the UE releases the RB information. If the UE does not receive the MSI message, and there is no relevant information about the service in the MBMS Unmodified Services Information message in the next MP, the UE releases the PTM RB of the service.

In the prior art, attention is mainly paid to the situation when the UE has received at least MBMS MODIFIED SERVICES INFORMATION and/or MBMS UNMODIFIED SERVICES INFORMATION messages without error under normal circumstances. But in fact the network environment is very complex. Sometimes the UE may be in a relatively harsh environment, so the UE may not receive the MSI message and other USI messages for releasing the PTM RB. In this case, according to the protocol, the UE will keep the RB for this service. If it is not released, RB resources will be occupied meaninglessly, and the UE will continuously receive information related to the service.

In another case, according to the existing protocol, if the UE does not receive the MSI message containing the RB release instruction sent by the network, and there is no relevant information about the service in the USI received later, then the UE will release the PTM RB. But in fact, at this time, there may be other circumstances that cause there is no access information of the service in the MSI and USI, for example, the service is performing other operations such as FLC, and this indication is indicated in the MSI, but the UE does not receive the MSI The FLC information about this service in the FLC information, and at the same time, there is no information about this service in the USI of the next MP. At this time, the UE will release the PTM RB of this service according to the existing agreement. Of course, this is a wrong operation. Or the number of services is relatively large, and UTRAN has no space to transmit the information of the service within the range of the MP monitored by the UE. At this time, the UE finds that the MSI and USI do not contain the information of the service, and will release the RB according to the agreement. In fact, it is a wrong action, because the service may still continue to transmit.

Therefore, according to the existing protocol, there are two aspects of irrationality or error: on the one hand, the UE may not receive the instruction to release the PTM RB, causing the UE to keep the PTM RB bearer, wasting system resources; on the other hand, the UE It is possible that the MSI received in one MP does not contain the service information of the service it is receiving, and the USI received in the next MP does not contain the service information of the service it is receiving. In this case, it will be released by mistake The PTM RB carries the bearer, causing the UE to be unable to continue to receive MBMS service data normally.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method for UE to release point-to-multipoint (PTM) radio bearer in MBMS service, so as to improve the accuracy of releasing PTM radio bearer by UE.

In order to achieve the above object, the technical solution of the present invention is specifically realized in the following way:

A method for user equipment UE in multimedia broadcast/multicast service MBMS to release point-to-multipoint PTM radio bearer, UE periodically receives control information of MBMS service, the method includes the following steps:

A. The UE judges whether the control information of the MBMS service has not been successfully obtained within the predetermined time, and if so, executes step B; otherwise, performs operations according to the content of the control information;

B. The UE releases the PTM radio bearer of the MBMS service.

Wherein, in step A, the method for the UE to judge whether the control information of the MBMS service is not successfully obtained within the predetermined time may be as follows:

If the control information of the MBMS service has not been received within the first predetermined time; or the control information of the MBMS service has been received within the first predetermined time, but all or the content of the control information of the MBMS service required by the user has not been obtained , it is determined that the control information of the MBMS service has not been successfully obtained within the predetermined time.

The method for the UE to judge whether the MBMS service control information has not been successfully obtained within the predetermined time in step A may be as follows: after the MBMS service control information is not received in one transmission period or two or more consecutive transmission periods, start the first Timer, timing the first predetermined time by the timer, judging whether the control information sent by the MCCH channel has not been received or not obtained all or the content of the control information of the MBMS service required by the user when the first predetermined time is up . The transmission period is a modification period or a repetition period.

The method for judging whether the control information of the MBMS service is obtained within the predetermined time described in step A may be:

After one transmission cycle or two or more consecutive transmission cycles do not receive the MBMS service control information, start the first counter, count the transmission cycle by the first counter to time the first predetermined time, and judge the time when the predetermined number of cycles is reached At the first predetermined time, whether the control information sent by the MCCH channel has not been received or all or the content of the control information of the MBMS service required by the user has not been obtained. The transmission period is a modification period or a repetition period.

The method for the UE to determine whether the control information of the MBMS service is not successfully obtained within the predetermined time in the step A may further include:

After obtaining the content of the MBMS service control information, the UE judges whether the service control information received within the second predetermined time does not contain MSI or USI; if yes, it determines that the MBMS service control information has not been obtained successfully.

The method for the UE to determine whether the service control information received within the second predetermined time does not contain MSI or USI may be:

If the control information received within the second predetermined time does not contain MSI or USI; or the control information received within the second predetermined time contains MSI or USI, but the message content of MSI or USI has not been obtained; or If the MSI and USI cannot be successfully received within one transmission cycle within the second predetermined time, it is determined that none of the control information received within the second predetermined time contains MSI or USI.

The method for the UE to determine whether the service control information received within the second predetermined time does not contain MSI or USI may be:

After no control information including MSI is received in one transmission cycle, and no service control information including MSI and USI is received in the next transmission cycle, start a second timer, and use the second timer to time a second predetermined time, Judging whether the control information containing the MSI and/or USI has not been received when the second predetermined time is up, or the message content of the MSI and/or USI has not been obtained, and if so, it is determined that the message received within the second predetermined time None of the control information contains MSI and/or USI.

The method for the UE to determine whether the service control information received within the second predetermined time does not contain MSI or USI may be:

After no control information including MSI is received in one transmission cycle, and no service control information including MSI and USI is received in the next transmission cycle, the second counter is started, and the second counter counts the transmission cycle to time the second counter. Two predetermined time, when judging the second predetermined time of the predetermined number of cycles, whether the control information comprising the MSI and/or USI has not been received, or the message content of the MSI and/or USI has not been obtained, if so, it is judged None of the control information received within the predetermined time period contains MSI and/or USI.

The method for the UE to determine whether the control information of the MBMS service is not successfully obtained within the predetermined time in the step A may further include:

After obtaining the MSI or USI, the UE judges whether the message content of the MSI or USI is wrong; if yes, it judges that the control information of the MBMS service has not been obtained successfully.

The method for the UE to judge whether the message content of the MSI or USI is wrong may be as follows: the UE judges whether a protocol reception error occurs, and if so, judges that the message content of the MSI or USI is demodulated incorrectly.

The method may further include:

After the UE correctly obtains the message content of the MSI or USI, it judges whether the message content of the MBMS service related to the UE is contained in the message content of the received MSI or USI within the third predetermined time; if yes, execute according to the message content Otherwise, if no MSI or USI message content is received within the third predetermined time, release the PTM radio bearer of the related MBMS service.

The method for judging whether the MSI or USI received within the third predetermined time includes the message content of the UE-related MBMS service may be:

After no control information including MSI is received in one transmission cycle, and MSI and USI not containing relevant MBMS service message content are received in the next transmission cycle, start the third timer, and use the third timer to time the third schedule Time, judging whether the MSI and/or USI of the relevant MBMS service message content has not been received when the third predetermined time is up. The transmission period is a modification period or a repetition period.

The method for judging whether the received MSI or USI contains the message content of the relevant MBMS service may be:

After receiving no control information including MSI in one transmission cycle, and receiving MSI and USI that do not contain relevant MBMS service message content in the next transmission cycle, start the third counter, and use the third counter to count the transmission cycle. Timing the third predetermined time, and judging whether the MSI and/or USI containing the content of the relevant MBMS service message has not been received when the third predetermined time of the predetermined number of cycles is reached. The transmission period is a modification period or a repetition period.

The method for judging whether the MSI and/or USI containing the content of the relevant MBMS service message has not been received may be:

If the MSIs received at the third predetermined time all contain relevant MBMS service message content, but no USI has been received, then it is determined that no MSI and/or USI containing relevant MBMS service message content has been received;

If all USIs received at the third predetermined time contain relevant MBMS service message content, but no MSI has been received, it is determined that no MSI and/or USI containing relevant MBMS service message content has been received.

The method may further include:

After the UE correctly obtains the content of the MSI or USI message, it judges whether it has received a predetermined number of MSI or/and USI containing relevant MBMS service control information within the fifth predetermined time, and if so, performs an operation according to the content of the message; otherwise, the UE releases PTM radio bearer of the MBMS service being received.

If the UE receives the radio bearer release information containing the relevant MBMS service in the MSI, it can determine whether the MSI and/or USI is received within the fourth predetermined time; or determine whether the MSI and/or USI received within the fourth predetermined time Whether the USI contains the control information of the related MBMS service, if so, perform operations according to the content of the control information; otherwise, the UE releases the PTM radio bearer of the MBMS service being received.

In the step B: before the UE releases the PTM radio bearer, it can further judge the situation of receiving the traffic channel within the sixth predetermined time;

If the UE does not receive service data from the service channel within the sixth predetermined time, release the PTM radio bearer of the relevant MBMS service.

The predetermined time may be set as an integer multiple of the modification period or an integer multiple of the repetition period.

The predetermined time may be set to be the same or different for different users; or the predetermined time may be set to be the same or different for different service types.

The timing of the timer can be set to be the same or different for different users; or the timing of the timer can be set to be the same or different for different service types.

The predetermined number of cycles of the counter may be set to be the same or different for different users; or the predetermined number of cycles of the counter may be set to be the same or different for different service types.

The predetermined number of cycles can be set by the UE or modified according to the current situation of receiving service control information; or set by the network side or modified according to the current situation of receiving service control information and sent to the UE.

Described user equipment can be the user equipment in WCDMA system or CDMA2000 system or UTRA TDD system or TD-SCDMA system.

It can be seen from the above technical solutions that the method for releasing the PTM radio bearer by the UE in the MBMS service of the present invention releases the radio bearer of the MBMS service according to the condition of receiving control information within a predetermined time. Since the present invention does not release the radio bearer as long as the MSI and/or USI is not received within two transmission periods as in the prior art, but after this situation occurs, the control channel is monitored for a period of time. After this period of time, the radio bearer is not released until the control information of the MBMS service is still not successfully obtained. In this way, it is possible to avoid the situation that the UE always reserves the PTM radio bearer and releases the PTM radio bearer by mistake, and improves the accuracy of releasing the PTM radio bearer by the UE.

Description of drawings

Fig. 1 is a schematic structural diagram of a wireless network supporting multicast/broadcast services;

Figure 2 is a complete process for a user to receive a certain MBMS broadcast service;

Fig. 3 is the complete process of the user receiving a certain MBMS multicast service;

FIG. 4 is a schematic diagram of an MCCH channel scheduling cycle;

Fig. 5 is the flow chart of releasing PTM RB method of the present invention;

Fig. 6 is a flowchart of a preferred embodiment of the method for releasing PTM RB in the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

The present invention provides a method for a UE to release a PTM RB. The implementation flow of the method is shown in FIG. 5, and FIG. 5 is a flow chart of the method for releasing a PTM RB in the present invention. It includes the following steps:

Step 501, UE periodically receives control information of MBMS service.

In step 502, the UE judges whether the control information of the MBMS service has not been successfully obtained within a predetermined time, and if yes, executes step 503; otherwise, executes step 504.

Step 503, the UE releases the PTM radio bearer of the MBMS service.

In step 504, the UE performs an operation according to the content of the control information.

The UE may determine that the control information of the MBMS service has not been successfully obtained in the following situations:

1. The UE has not received MCCH information within the first predetermined time, or has received MCCH information within the first predetermined time, but has not acquired all MBMS or content of service control information required by the user.

2. Although the UE has obtained the content of the control information in the MCCH information, the MCCH information received within the second predetermined time does not contain MSI or USI.

3. Although the MCCH information received by the UE includes MSI or USI, the message content of the MSI or USI is wrong.

In addition, in the present invention, if the UE obtains the control information of the MBMS service successfully, but the MSI or USI received within the third predetermined time does not contain the message content of the MBMS service being received, the UE judges that the MBMS service being received has been completed. stop, thereby releasing the PTM RB established for the MBMS service.

A preferred embodiment is given below to describe the present invention in detail.

Referring to Fig. 6, Fig. 6 is a flowchart of a preferred embodiment of the method for releasing PTM RB in the present invention. The process includes the following steps:

Step 601, UE receives MCCH in one transmission period.

Step 602, judging whether MCCH information is received or whether the content of MBMS service control information or the content of service control information required by the user can be obtained from the received MCCH information, if yes, perform step 603; otherwise, perform step 621.

Step 603, judging whether the MCCH information contains MSI and/or USI, and if so, further judging whether the message content of the MSI and/or USI can be demodulated; if the MCCH information does not contain MSI and/or USI, or cannot be decoded If the message content of the MSI and/or USI is called out, step 604 is performed; otherwise, step 615 is performed.

Step 604, judging whether the message content in the received MSI or USI is wrong, if yes, go to step 615, otherwise go to step 605.

In this step, the UE can judge whether the demodulation of the message content of the MSI or USI is wrong by judging whether a protocol reception error or other errors occur. For example, if the demodulated message type does not conform to the protocol, or the IE cell receives an error, it is considered that a protocol reception error has occurred.

Step 605, judging whether the MSI or USI contains the control information of the MBMS service that the UE is receiving, if yes, execute step 606; otherwise, execute step 609.

Step 606, judge whether the MSI includes RB release signaling, if yes, execute step 607; otherwise, execute step 608.

Step 607, the UE releases the PTM RB of the MBMS service indicated in the release signaling, stops receiving the MCCH if the UE only receives one MBMS service, and continues to periodically receive the MCCH if it needs or is receiving other MBMS services.

In step 608, the UE performs an operation according to the message content of the MSI or USI, and returns to step 601. This process is exactly the same as the prior art, and will not be repeated here.

In step 609, the UE records that the MSI or USI in the transmission period does not contain the control information of the MBMS service being received.

In step 610, the UE judges according to the record whether the MSI and/or USI received in two consecutive transmission periods do not contain the control information of the received MBMS service, if yes, execute step 611; otherwise, return to step 601.

The judgment method in this step can be: if the UE does not receive the MCCH channel or the MSI message on the channel within one transmission period, and receives the MSI and USI message on the next MCCH channel, but there is no user reception related service information, it is determined that the MSI or USI received in two consecutive transmission periods does not contain the control information of the received MBMS service.

Step 611 , judging whether the third timer has been started, if yes, execute step 612 ; otherwise, execute step 614 .

Step 612, judge whether the MSI and/or USI containing the MBMS service control information being received has not been received when the predetermined time of the third timer expires, if yes, execute step 613; otherwise, return to step 601.

Step 613, release the PTM RB of the MBMS service being received, stop receiving the MCCH if the UE only receives one MBMS service, and continue to periodically receive the MCCH if it is still receiving other MBMS services.

Step 614, start the third timer, return to step 601.

In this embodiment, the UE judges whether the MSI and/or USI containing the MBMS service control information that the UE is receiving is received within the third predetermined time by timing with the third timer. Periodic counting to determine whether the MSI and/or USI containing the MBMS service control information that the UE is receiving is received within the third predetermined time, and the specific determination method is:

After receiving no control information including MSI in one transmission cycle, and receiving MSI and USI that do not contain MBMS service control information that UE is receiving in the next transmission cycle, start the third counter, and use the third counter to time the third During the predetermined time, the counter is incremented by one every time a transmission cycle passes, and after the third predetermined cycle time arrives, it is judged whether the MSI and/or USI containing the MBMS service control information that the UE is receiving is received within this period.

In practical applications, if the MSI and/or USI containing the MBMS service control information being received by the UE is received within the third predetermined time, the third timer or the third counter may be cleared and turned off. If no control information containing MSI is received in the next transmission cycle, and the MSI and USI that do not contain the MBMS service control information that the UE is receiving are received in the next transmission cycle, restart the third timer or the first Three counters. This can ensure that: if the UE does not receive the MSI and/or USI containing the MBMS service control information that the UE is receiving at the beginning, but receives it several times later, it does not receive the MSI and/or USI containing the MBMS service control information that the UE is receiving within the third predetermined time. The MSI and/or USI of the MBMS service control information also releases the PTM RB.

In this embodiment, the UE does not release the PTM RB until it has not received the MSI and/or USI containing the MBMS service control information being received within a predetermined time. In practical applications, a number of times of reception can also be set, and if the received MSI and/or USI within the predetermined time does not reach the preset number of times of reception, the PTM RB will be released. For example: within the timer time range, assuming that there are N MP periods, the UE receives n MSI and/or USI information, if n accounts for a certain proportion of N, and there is no control information about the MBMS service being received, then The UE releases the PTM RB information.

In this embodiment, because the protocol stipulates that the UE can determine the content of the message about the UE receiving the MBMS service only after receiving the MSI and USI within one MP period. Therefore, in this embodiment, the method for judging whether the MSI and/or USI containing the content of the MBMS service message being received has not been received can be as follows:

If all MSIs received at the third predetermined time contain relevant MBMS service message content, but no USI has been received, it is determined that no MSI and/or USI containing relevant MBMS service message content has been received.

If all USIs received at the third predetermined time contain relevant MBMS service message content, but no MSI has been received, it is determined that no MSI and/or USI containing relevant MBMS service message content has been received.

If the MSI received in each modification period of the third predetermined time does not contain the content of the relevant MBMS service message, and the USI received in the modification period does not include the content of the MBMS service message being received, then it is determined that the modification period has not received Contains the MSI and USI of the MBMS service message content being received.

In step 615, the UE records that the MCCH information containing the MSI or USI is not received or the message content of the MSI or USI is not obtained during the transmission period, or the content of the received MSI or USI message is wrong.

Step 616, the UE judges according to the record whether it has not received MCCH information containing MSI and/or USI for two consecutive transmission periods or has not obtained the message content of MSI and/or USI, or the content of the received MSI and/or USI message has errors, If yes, go to step 617; otherwise, go to step 601.

The judgment method in this step is: if the UE does not receive MCCH information containing MSI in one transmission cycle, and does not receive MCCH information containing MSI and USI or does not obtain the message content of MSI or USI in the next transmission cycle, Or if the content of the received MSI or USI message is wrong, it is determined that the MSI or USI has not been correctly received for two consecutive transmission cycles.

Step 617, judge whether the second timer has been started, if yes, execute step 618; otherwise, execute step 620.

Step 618, judge whether the MCCH information containing MSI or USI has not been received when the second timing time is up, or the message content of MSI or USI has not been obtained or the content of the received MSI or USI message has an error; if yes, then execute the step 619 ; otherwise, return to step 601 .

In this step, if the control information received within the second predetermined time does not contain MSI or USI; or the control information received within the second predetermined time contains MSI or USI, but the message content of MSI or USI has not been obtained ; or the MSI and USI cannot be successfully received within a transmission cycle within the second predetermined time, then it is determined that none of the control information received within the second predetermined time contains MSI or USI.

Step 619, UE releases all PTM RBs of MBMS services being received, and stops receiving MCCH.

Step 620, start the second timer, return to step 601.

In this embodiment, the UE judges whether the MCCH information containing the MSI or USI is received within the second predetermined time by timing the second timer. In practical applications, it can also be judged by counting the transmission period 2. Whether the MCCH information containing MSI or USI is received within the predetermined time, the specific judgment method is:

After no control information containing MSI is received in one transmission cycle, and MCCH information containing MSI and USI is not received in the next transmission cycle, the second counter is started, and the second predetermined time is timed by the second counter. The transmission cycle counter is incremented by one, and after the second predetermined number of cycles is reached, it is judged whether MCCH information including MSI or USI is received within this time.

In practical applications, if the MSI and/or USI is received within the second predetermined time, the second timer or the second counter may be cleared and turned off. If the control information containing the MSI is not received in the next transmission cycle, and the second timer or the second counter is restarted after receiving the control information not containing the MSI and the USI in the next transmission cycle. This can ensure that: if the UE does not receive the MSI and/or USI at the beginning, but receives it several times later, and does not receive the MSI and/or USI within the second predetermined time later, the PTM RB will also be released.

In step 621, the UE records that the MCCH information is not received or the content of the MCCH information is not obtained during the transmission period.

In step 622, the UE judges according to the record whether it has not received MCCH information or obtained MCCH information content for two consecutive transmission periods, and if yes, executes step 623; otherwise, returns to step 601.

Step 623, judge whether the first timer has been started, if yes, execute step 624; otherwise, execute step 626.

Step 624, when judging the timing of the first timer, whether the MCCH message has not been received; If the MBMS control information is not successfully obtained within the first predetermined time, go to step 625; otherwise go to step 626.

Step 625, UE releases all PTM RBs, and stops receiving MCCH channel.

In step 626, the UE starts the first timer, and returns to step 601.

In this embodiment, the UE judges whether the MCCH information is received within the first predetermined time by timing the first timer. Successfully received MCCH information, the specific judgment method is:

After not receiving MCCH information for two consecutive transmission cycles, the first counter uses the first counter to time the first predetermined time, and every time a transmission cycle counter is added by one, when reaching the first predetermined number of cycles, it is judged whether MCCH information is not received or all MCCH information is not obtained.

In practical applications, if the MCCH information is successfully received within the first predetermined time, the first timer or the first counter may be cleared and turned off. If the MCCH information is not successfully received in the following two consecutive transmission periods, restart the first timer or the first counter. This can ensure that: if the UE fails to receive the MCCH information at the beginning, but receives it several times later, and fails to receive the MCCH information within the next first predetermined time, the PTMRB will also be released.

In this embodiment, after the MCCH information has not been received for two consecutive transmission periods, the first predetermined time is set by the first timer or the first counter, which can reduce some cases of blind start. Of course, more than two transmission cycles, such as three or four, etc., can also be used, but not too many, if too many, it may affect the accuracy of judgment.

In addition, in practical applications, the UE may receive the wrong RB release signaling. In this case, the UE releases the RB after receiving the RB release signaling, but the actual release signaling may not be the MBMS service it is receiving. RB release signaling, causing the UE to release RBs by mistake.

Therefore, in this embodiment, after receiving the RB release signaling, the UE may not directly release the RB, but start a fourth timer to determine whether the MSI or USI is received within the fourth predetermined time of the fourth timer; Or judge whether the MSI or USI received within the fourth predetermined time of this timer contains the control information of the MBMS service being received; if yes, perform subsequent steps according to the control information, otherwise release the RB.

In addition, in order to ensure the correct release of RBs in this embodiment, when UE decides to release RBs, it first receives traffic channels for a period of time, which only takes 1 to 2 MPs; if no traffic data is received from traffic channels during this period , release the PTM radio bearer of the MBMS service being received.

The transmission period in this embodiment may be a modification period (MP) or a repetition period (RP). Various predetermined times can be set as integer multiples of the transmission period.

The number of various transmission cycles in this embodiment can be adaptively changed according to different situations. It can be that the UE modifies the predetermined number of cycles according to the current situation of receiving service control information; In some cases, the predetermined number of periods is modified and delivered to the UE.

For example: if the UE fails to receive the MCCH for two consecutive services, then the UE reduces the count of the transmission cycle, that is, if the UE does not receive the relevant information of the MBMS service within a shorter period of time, it will release The business RB.

The various scheduled times in this embodiment may be set to be the same or different for different users; or the scheduled times may be set to be the same or different for different service types. And the timing time of each timer in this embodiment can be set to be the same or different for different users; or the timing time of the timer can be set to be the same or different for different service types. Similarly, in this embodiment, the predetermined number of cycles of each counter can be set to be the same or different for different users; or the predetermined number of cycles of the counter can be set to be the same or different for different service types.

In the above process, it is taken as an example to release the PTM RB of the MBMS service being received. In practical applications, regardless of whether the UE is currently receiving a certain MBMS service data, or is preparing to receive a certain MBMS service data, or has finished receiving a certain MBMS service data, as long as the MBMS service has been activated and the corresponding PTM RB, the method of the present invention is applicable.

The method of the invention can at least be applied to communication systems such as WCDMA, CDMA2000, UTRA TDD and TD-SCDMA that provide MBMS services. Described user equipment can be the user equipment in WCDMA system or CDMA2000 system or UTRA TDD system or TD-SCDMA system.

It can be seen from the above-mentioned embodiments that in the method for UE releasing PTM RB of the present invention, the UE releases the RB of the MBMS service according to the situation of receiving control information within a predetermined time. Therefore, it is possible to avoid the situation that the UE keeps the PTM radio bearer and releases the PTM radio bearer by mistake, improves the accuracy of the UE releasing the PTM radio bearer, and can reduce the error of the UE receiving the MBMS service and the waste of system resources.

Claims (23)

1. A method for user equipment UE to release point-to-multipoint PTM radio bearer in multimedia broadcast/multicast service MBMS, UE periodically receives control information of MBMS service, it is characterized in that, the method comprises the following steps: A. The UE judges whether the control information of the MBMS service has not been successfully obtained within the predetermined time, and if so, executes step B; otherwise, performs operations according to the content of the control information; B. The UE releases the PTM radio bearer of the MBMS service. 2. The method according to claim 1, wherein in step A, the method for the UE to judge whether the control information of the MBMS service has not been successfully obtained within the predetermined time is as follows: If the control information of the MBMS service has not been received within the first predetermined time; or the control information of the MBMS service has been received within the first predetermined time, but all or the content of the control information of the MBMS service required by the user has not been obtained , it is determined that the control information of the MBMS service has not been successfully obtained within the predetermined time. 3. The method according to claim 2, wherein in step A, the method for the UE to judge whether the control information of the MBMS service has not been successfully obtained within the predetermined time is as follows: After not receiving MBMS service control information in one transmission cycle or two or more consecutive transmission cycles, start the first timer, time the first predetermined time through the timer, and judge whether the MCCH channel has not been received when the first predetermined time expires The content of the control information sent or the control information of the MBMS service required by the user has not been obtained; The transmission period is a modification period or a repetition period. 4. The method according to claim 2, wherein in step A, the method for the UE to judge whether the control information of the MBMS service has not been successfully obtained within the predetermined time is as follows: After no MBMS service control information is received in one transmission cycle or two or more consecutive transmission cycles, start the first counter, count the transmission cycle by the first counter to time the first predetermined time, and judge that the first predetermined time has reached the predetermined number of cycles Time, whether the control information sent by the MCCH channel has not been received or the content of all or the control information of the MBMS service required by the user has not been obtained; the transmission period is a modification period or a repetition period. 5. The method according to claim 2, characterized in that the method for the UE in step A to determine whether the control information of the MBMS service has not been successfully obtained within a predetermined time period further comprises: After obtaining the content of the MBMS service control information, the UE judges whether the service control information received within the second predetermined time does not contain MBMS modified service information MSI or MBMS non-modified service information USI; control information. 6. The method according to claim 5, wherein the method for the UE to judge whether the service control information received within the second predetermined time does not contain MSI or USI is as follows: If the control information received within the second predetermined time does not contain MSI or USI; or the control information received within the second predetermined time contains MSI or USI, but the message content of MSI or USI has not been obtained; or If the MSI and USI cannot be successfully received within one transmission cycle within the second predetermined time, it is determined that none of the control information received within the second predetermined time contains MSI or USI; The transmission period is a modification period or a repetition period. 7. The method according to claim 6, wherein the method for the UE to judge whether the service control information received within the second predetermined time does not contain MSI or USI is as follows: After no control information including MSI is received in one transmission cycle, and no service control information including MSI and USI is received in the next transmission cycle, start a second timer, and use the second timer to time a second predetermined time, Judging whether the control information containing the MSI and/or USI has not been received when the second predetermined time is up, or the message content of the MSI and/or USI has not been obtained, and if so, it is determined that the message received within the second predetermined time None of the control information contains MSI and/or USI. 8. The method according to claim 6, wherein the method for the UE to judge whether the service control information received within the second predetermined time does not contain MSI or USI is as follows: After no control information including MSI is received in one transmission cycle, and no service control information including MSI and USI is received in the next transmission cycle, the second counter is started, and the second counter counts the transmission cycle to time the second counter. Two predetermined time, when judging the second predetermined time of the predetermined number of cycles, whether the control information comprising the MSI and/or USI has not been received, or the message content of the MSI and/or USI has not been obtained, if so, it is judged None of the control information received within the predetermined time period contains MSI and/or USI. 9. The method according to claim 5, characterized in that, in step A, the UE judging whether the UE fails to obtain the control information of the MBMS service within a predetermined time period further comprises: After obtaining the MSI or USI, the UE judges whether the message content of the MSI or USI is wrong; if yes, it judges that the control information of the MBMS service has not been obtained successfully. 10. The method according to claim 9, wherein the method for the UE to judge whether the message content of the MSI or USI is wrong is as follows: the UE judges whether a protocol reception error occurs, and if so, judges the message content of the MSI or USI Demodulation error. 11. The method of claim 9, further comprising: After the UE correctly obtains the message content of the MSI or USI, it judges whether the message content of the MBMS service related to the UE is contained in the message content of the received MSI or USI within the third predetermined time; if yes, execute according to the message content Otherwise, if no MSI or USI message content is received within the third predetermined time, release the PTM radio bearer of the related MBMS service. 12. The method according to claim 11, characterized in that the method for judging whether the MSI or USI received within the third predetermined time period contains the message content of the UE-related MBMS service is as follows: After no control information including MSI is received in one transmission cycle, and MSI and USI not containing relevant MBMS service message content are received in the next transmission cycle, start the third timer, and use the third timer to time the third schedule Time, judging whether the MSI and/or USI of the relevant MBMS service message content has not been received when the third predetermined time is up; The transmission period is a modification period or a repetition period. 13. The method according to claim 11, wherein the method for judging whether the received MSI or USI contains the message content of the relevant MBMS service is as follows: After receiving no control information including MSI in one transmission cycle, and receiving MSI and USI that do not contain relevant MBMS service message content in the next transmission cycle, start the third counter, and use the third counter to count the transmission cycle. Timing the third predetermined time, judging whether the MSI and/or USI containing the content of the relevant MBMS service message has not been received when the third predetermined time of the predetermined number of cycles is reached; the transmission cycle is a modification cycle or a repetition cycle. 14. The method according to claim 12 or 13, characterized in that the method for judging whether the MSI and/or USI containing the relevant MBMS service message content has not been received is: If the MSIs received at the third predetermined time all contain relevant MBMS service message content, but no USI has been received, then it is determined that no MSI and/or USI containing relevant MBMS service message content has been received; If all USIs received at the third predetermined time contain relevant MBMS service message content, but no MSI has been received, it is determined that no MSI and/or USI containing relevant MBMS service message content has been received. 15. The method of claim 9, further comprising: After the UE correctly obtains the content of the MSI or USI message, it judges whether it has received a predetermined number of MSI or/and USI containing relevant MBMS service control information within the fifth predetermined time, and if so, performs an operation according to the content of the message; otherwise, the UE releases PTM radio bearer of the MBMS service being received. 16. The method according to claim 11, characterized in that: if the UE receives the radio bearer release information containing the relevant MBMS service in the MSI, it is judged within the fourth predetermined time: whether the MSI and/or USI is received; or Judging whether the MSI and/or USI received within the fourth predetermined time period contains relevant MBMS service control information, and if so, perform operations according to the content of the control information; otherwise, the UE releases the PTM radio bearer of the MBMS service being received. 17. The method according to claim 1 or 15, characterized in that in the step B: before the UE releases the PTM radio bearer, it further judges the condition of receiving the traffic channel within the sixth predetermined time; If the UE does not receive service data from the service channel within the sixth predetermined time, release the PTM radio bearer of the relevant MBMS service. 18. The method according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, or 16, characterized in that: the predetermined time is set as an integer of the modification period times or integer multiples of the repetition period. 19. The method according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, or 15, wherein the predetermined time is set to be the same for different users or different; or the predetermined time is set to be the same or different for different service types. 20. The method according to claim 3, 7 or 12, characterized in that: the timing time of the timer is set to be the same or different for different users; or the timing time of the timer is set to be the same for different service types or different. 21. The method according to claim 4, 8 or 13, characterized in that: the predetermined cycle number of the counter is set to be the same or different for different users; or the predetermined cycle number of the counter is set to be the same for different service types or different. 22. The method according to claim 4, 8 or 13, characterized in that: the predetermined number of cycles is set by the UE or modified according to the current situation of receiving service control information; or is set by the network side or according to the current situation of receiving service control information Modify the predetermined number of cycles and send it to the UE. 23. The method according to claim 1, characterized in that: said user equipment is a user equipment in a WCDMA system or a CDMA2000 system or a UTRA TDD system or a TD-SCDMA system.

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