WO2011116661A1

WO2011116661A1 - User equipment and method for acquiring multicast control information

Info

Publication number: WO2011116661A1
Application number: PCT/CN2011/071797
Authority: WO
Inventors: 苟伟; 艾建勋
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-03-25
Filing date: 2011-03-15
Publication date: 2011-09-29
Also published as: CN102202262B; CN102202262A

Abstract

The present invention discloses a method and user equipment for acquiring multicast control information. The method includes the following steps: when the user equipment can not determine whether the service session start information of a Multimedia Broadcast Multicast Service (MBMS), which the user is interested in, is involved in the Multicast Control Channel (MCCH) information to be transmitted, said user equipment acquires the MCCH information. The invention improves the reliability of MCCH information acquirement.

Description

User equipment and method for acquiring multicast control information

Technical field

The present invention relates to a Long Term Evolution (LTE) system, and in particular to a user equipment and method for acquiring information of a Multicast Control Channel (MCCH).

Background technique

With the rapid development of the Internet and the popularity of large-screen multi-function mobile phones, a large number of mobile data multimedia services and various high-bandwidth multimedia services have emerged, such as video conferencing, television broadcasting, video on demand, advertising, online education, interactive games, and the like. This aspect meets the rising business needs of mobile users and brings new business growth points to mobile operators. These mobile data multimedia services require multiple users to receive the same data at the same time, and have the characteristics of large data volume, long duration, and delay sensitivity compared with general data services.

In order to effectively utilize mobile network resources, 3rd Generation Partnership Project (3rd Generation)

The Partnership Project (3GPP) proposes a Multimedia Broadcast Multicast Service (MBMS), which is a technology that transmits data from one data source to multiple targets, and implements the network (including the core network). The sharing of resources with the access network improves the utilization of network resources (especially air interface resources). MBMS defined by 3GPP can not only realize plain text low-rate message class multicast and broadcast, but also realize high-speed multimedia service broadcast and multicast, providing a variety of rich video, audio and multimedia services, which undoubtedly conforms to future mobile The trend of data development provides a better business prospect for the development of 3G.

At present, the reception of the MBMS service in the LTE is divided into two cases. One is that the User Equipment (UE) is interested in the MBMS service, and has learned that the MBMS service of interest is in that multimedia broadcast multicast. The Medium Broadcast Multicast Network (MBSFN) area i or, but the service has not yet started playing (it can be understood that the service is about to be played). According to the current protocol, the UE needs to be always Listening to the MCCH change notifications message until the MCCH of the MBSFN area where the MBMS service of interest to the UE is located (hereinafter The MCCH profile is updated for the MCCH information of interest to the UE (it is specified in LTE that the update is caused by the start of a new MBMS service session in the MBSFN area), and the UE can read the corresponding MCCH information in the MCCH modification. Within the cycle.

FIG. 1 is a schematic diagram showing an MCCH repetition period and a modification period of a cell in an MBSFN area in LTE, and is also accompanied by a transmission diagram of a corresponding MCCH update notification message. The MCCH information is sent periodically, but the MCCH information sent multiple times in each MCCH modification period is the same, and the updated MCCH information can be sent only during the next MCCH modification period (ie, at the next MCCH modification period opportunity). The MCCH information is not allowed to be updated during the MCCH modification period. The MCCH update notification message is sent 2 times or 4 times in an MCCH modification period, and the specific number of times is automatically configured by the base station. The MCCH update notification message is to notify the UE whether the MCCH information in the next MCCH modification period is about to be updated, or may be The reason for the update is only specified as a result of the start of the MBMS session, that is, a new MBMS session start message is started to be transmitted.

The MCCH update notification message is valid only for one modification period, that is, the MCCH update notification message in the Nth MCCH modification period only informs whether the MCCH information in the N+1th MCCH modification period is updated, and the N+1th MCCH modification period The MCCH update notification message is used to notify whether the MCCH information in the N+2 MCCH modification period changes with respect to the MCCH information in the N+1th MCCH modification period.

According to the LTE protocol, when an MBMS service that is of interest to an MBMS-capable UE does not start, the UE always listens for the update notification message of the MCCH of the MBSFN area where the MBMS service is located, until the MCCH update notification message informs the UE that the MCCH information occurs. Update, at this time, the UE needs to receive MCCH information in the upcoming MCCH modification period. The purpose of this is to prevent the UE that does not receive the MBMS service from receiving the MCCH information in each MCCH modification period, and check whether there is MBMS session start information transmission of interest to itself, because the MCCH information data amount is much larger than the MCCH update notification message data. The quantity, and the MCCH information often does not change. If the UE that does not receive the MBMS service receives the MCCH information every modification period, the UE power is wasted.

As shown in FIG. 2, according to the current LTE protocol, after the UE misses the MCCH update notification message of the Nth MCCH modification period, the UE will continue in the N+1th MCCH modification period. The MCCH update notification message is received without receiving the MCCH information, which may cause the UE to miss the opportunity to receive the MBMS.

After analysis, when such a UE is in the following scenario, it is possible to miss the MCCH information that the UE is interested in, which may affect the UE's missed reception of the MBMS that it is interested in.

Scene 1 , listening to MCCH update notification message UE, waiting for interest

The MBMS session starts, but the UE is missed by the network, causing the UE to miss the reception of multiple MCCH update notification messages of the MCCH that the UE is interested in during the current modification period. Finally, when the next modification period of the MCCH that the UE is interested in comes. The UE still cannot determine whether the MCCH information in the next MCCH modification period has been updated. According to the protocol, if the UE cannot determine whether the MCCH is updated in the next MCCH modification period, the UE continues to receive the MCCH in the next MCCH modification period. The notification message is updated without receiving the MCCH information. If the base station sends an MCCH that is notified that the UE is interested in the current MCCH modification period, the MCCH will be updated in the next MCCH modification period. Therefore, according to the LTE protocol, the UE can only continue to receive the MCCH update notification message, and the next MCCH modification is performed. The periodic MCCH update notification message no longer informs the UE that the MCCH information of interest is updated because the previous MCCH modification period has been notified, which causes the UE to miss receiving the MCCH of interest, and finally causes the UE to miss receiving the MBMS of interest. .

The following two scenarios are similar to the above scenarios, but only cause the UE to miss the MCCH update notification message. The following is a brief description:

Scenario 2, the UE that is listening to the MCCH update notification is waiting for the MBMS session of its own interest to start, but due to the UE's movement, cell handover or reselection is required, but the UE starts to obtain the UE handover or reselection process. The sending period and the location information of the MCCH update notification message of the target cell are required to be in a certain period of time. During this period, the UE may miss the reception of the MCCH update notification message in one or more MCCH modification periods, thereby causing the following possible situations. :

It is possible that the UE may not receive the MCCH information in the next MCCH modification period due to the missed MCCH update notification message in the MCCH modification period when the next MCCH modification period comes. The subsequent situation of the UE is the same as scenario 1.

Scenario 3, because the MCCH update notification message is a block error rate of 2% for a single transmission, the block error rate Higher, this is because the MCCH update notification message is transmitted in single cell mode, and does not support MBSFN merging of neighboring cells. Therefore, when the channel quality of the UE is poor, the MCCH update notification message may receive errors, but the MCCH information and The MBMS is transmitted in the MBSFN mode and supports the MBSFN combining of neighboring cells, so that the MCCH information and the MBMS reliability are much higher than the MCCH update notification message. This will cause the UE that is listening to the MCCH update notification message to miss the MCCH update notification message and finally miss the opportunity to receive the MCCH information during the MCCH modification period, thereby missing the opportunity to receive the MBMS. Summary of the invention

The technical problem to be solved by the present invention is to provide a user equipment and method for acquiring multicast control information, which can reduce the occurrence of missed reception of the MBMS by the UE, and provide a path for the UE to receive the MCCH information, so that the reliability of the MCCH information acquisition is improved. .

In order to solve the above problem, the present invention provides a method for obtaining multicast control information, including: when a user equipment cannot determine whether a multicast broadcast multicast service (MBMS) of interest is included in a multicast control channel (MCCH) information to be transmitted. The user equipment acquires MCCH information when the service session starts information.

Preferably, when the user equipment cannot determine whether the MCCH information is updated in the upcoming MCCH modification period before the modification period of the MCCH of the user equipment is interested, the user equipment is in the upcoming MCCH modification period. Receive MCCH information.

Preferably, before the modification period of the MCCH of the user equipment is interested, the user equipment cannot determine that the MCCH information in the upcoming MCCH modification period is due to the MCCH update caused by the new MBMS service session start information, The user equipment receives MCCH information during the upcoming MCCH modification period.

Preferably, when the user equipment cannot determine whether the MCCH information in the MCCH modification period of interest contains the MBMS session start information of interest, the user equipment receives the MCCH information at the upcoming MCCH repetition period within the current MCCH modification period.

Advantageously, the step of receiving MCCH information in an upcoming MCCH modification period comprises: receiving at a first MCCH repetition period within an upcoming MCCH modification period MCCH information;

Multiple MCCH repetition periods are included in one MCCH modification period.

Preferably, when the user equipment cannot determine whether the MCCH information in the MCCH modification period of interest contains the MBMS session start information of interest, the user equipment receives the MCCH information at the upcoming MCCH repetition period of the current MCCH modification period.

Preferably, the user equipment is a user equipment that is listening to the MCCH update notification message to learn whether the MCCH information of the MBSFN area where the MBMS of interest is located is updated.

The invention also provides a user equipment for acquiring multicast control information:

The user equipment is configured to: acquire MCCH information when it is determined whether the multicast control multicast channel (MCCH) information to be transmitted includes the multimedia broadcast multicast service (MBMS) service session start information of interest.

Preferably, the user equipment is configured to: when the modification period timing of the MCCH of interest is coming, and cannot determine whether the MCCH information is updated in the upcoming MCCH modification period, in the upcoming MCCH modification period Receive MCCH information.

Preferably, the user equipment is configured to: the timing of the modification period of the MCCH of interest is coming, and the MCCH information in the upcoming MCCH modification period is determined to be due to the new MBMS service session start information. Upon updating, the MCCH information is received during the upcoming MCCH modification period.

Preferably, the user equipment is further configured to: when it is not determined whether the MCCH information in the MCCH modification period of interest includes the multimedia broadcast multicast service (MBMS) session start information of interest, which is coming within the current MCCH modification period. The MCCH information is received at the MCCH repetition period.

Preferably, receiving the MCCH information in the upcoming MCCH modification period means receiving the MCCH information at any one of the MCCH repetition periods in the upcoming MCCH modification period.

Preferably, the user equipment is configured to: when the user equipment cannot determine whether the MCCH information in the MCCH modification period of interest includes the MBMS session start information of interest, the upcoming MCCH repetition period in the current MCCH modification period. Receive MCCH information. Preferably, the user equipment is a user equipment that is listening to the MCCH update notification message to learn whether the MCCH information of the MBSFN area where the MBMS of interest is located is updated.

In summary, the technical solution of the present invention can ensure that the UE that listens to the MCCH update notification message can avoid receiving the MBMS service that is of interest to the user for the following reasons: When the UE moves between cells, etc. During the selection to the target cell; when the UE is in short-term interference; when the UE is in a poor channel quality position, the MCCH update notification message cannot be correctly parsed. Improve the reliability of MCCH information acquisition. BRIEF abstract

1 is a schematic diagram of transmission of a MCCH and MCCH update notification message in the prior art; FIG. 2 is a schematic diagram for explaining that the UE cannot determine the content of MCCH information in a next MCCH modification period;

FIG. 3 is a schematic diagram for explaining that the UE cannot determine the content of the MCCH information within the current MCCH modification period. Preferred embodiment of the invention

In order to further illustrate the present invention, the following detailed description will be made in conjunction with the accompanying drawings.

The present invention provides a user equipment for acquiring multicast control information, which is used to obtain MCCH information when it is unable to determine whether the MCCH information to be transmitted includes the MBMS service session start information of interest.

When the user equipment cannot determine whether the MCCH information to be sent includes the MBMS service session start information of interest, the acquisition of the MCCH information means that the user equipment is about to arrive at the modification cycle of the MCCH in which it is interested, and cannot determine that the upcoming When the MCCH information is updated in the MCCH modification period, the MCCH information is received in the upcoming MCCH modification period.

When the user equipment cannot determine whether the MCCH information to be sent includes the MBMS service session start information of interest, the acquisition of the MCCH information means that the user equipment is about to arrive at the modification cycle of the MCCH in which it is interested, and cannot determine that the upcoming MCCH modification period Whether the inner MCCH information is an MCCH update due to a new MBMS service session start information, the MCCH information is received in the upcoming MCCH modification period.

The user equipment is further configured to: when it is not determined whether the MCCH information in the MCCH modification period of interest includes the MBMS session start information of interest, receive the MCCH information at the upcoming MCCH repetition period in the current MCCH modification period.

Receiving the MCCH information in the upcoming MCCH modification period means receiving the MCCH information at any one of the MCCH repetition periods in the upcoming MCCH modification period.

The user equipment is a user equipment that is listening to the MCCH update notification message to learn whether the MCCH information of the MBSFN area in which the MBMS of interest is located is updated.

The present invention provides a method for acquiring multicast control information. When the UE cannot determine whether the MCCH information to be transmitted includes the MBMS service session start information of interest, the UE acquires the MCCH information.

Specifically, the present invention is mainly directed to UEs that do not start receiving MBMS services, but are potentially interested in MBMS services. According to the LTE protocol, such UEs need to monitor whether the MCCH is updated by monitoring the MCCH update notification message.

Such a UE can determine whether the MCCH information to be transmitted has been updated by listening to the MCCH update notification message (in LTE, the MCCH update notification message only informs the MCCH occurrence due to the MBMS service session start information), and then the UE is in the next MCCH modification period. The MCCH information is received internally to detect whether the MBMS service session start information of interest is included therein.

The following describes a solution in which the UE cannot determine whether the MCCH information to be transmitted is updated in several typical scenarios.

Embodiment 1

The present embodiment provides a method for acquiring multicast control information. When the UE cannot determine whether the MCCH information is updated in the upcoming MCCH modification period before the arrival of the modification period of the MCCH that is of interest to the UE, the UE needs to be coming. MCCH information is received during the MCCH modification period; or, before the modification period of the MCCH that is of interest to the UE arrives, the UE It is not determined that the MCCH information in the upcoming MCCH modification period is due to the MCCH update caused by the new MBMS service session start information, and the UE receives the MCCH information in the upcoming MCCH modification period.

As shown in FIG. 2, for various reasons, the UE does not obtain an accurate MCCH update notification message in a certain MCCH modification period, and the MCCH update notification message notifies the UE of the MCCH information update in the next MCCH modification period (or the MCCH update notification). The message informs the UE whether the MCCH information in the next MCCH modification period is due to the MCCH update caused by the new MBMS service session start information, and is caused by the start of the session of the MBMS service that the UE is interested in. Therefore, the UE needs to be coming soon. The MCCH information is received in the next MCCH modification period, and the MCCH information is received at the position shown by the thick line in the figure.

After the scheme is used, after the UE that is listening to the MCCH update notification message misses the reception of the MCCH update notification message in one or more MCCH modification periods due to various reasons, the UE cannot In case of determining whether the MCCH information is updated, the UE needs to receive the MCCH information in the upcoming MCCH modification period. This can reduce the occurrence of the above-mentioned UE missed reception MBMS, and provide a path for the UE to receive MCCH information, so that the MCCH information acquisition reliability is improved.

Embodiment 2

The present embodiment provides a method for acquiring multicast control information. When the UE cannot determine whether the MCCH information of the MCCH information in the current modification period includes the MBMS session start information that is of interest to the UE, the UE may be in the current MCCH modification period. The MCCH information is received at the MCCH repetition period.

The reason why the UE cannot determine whether the MCCH information in the current MCCH modification period includes the MBMS session start information of the UE interest is:

The UE may be caused by just performing cell handover or cell reselection, for example, one is listening.

The UE of the MCCH update notification message performs the cell handover or the cell reselection. After the UE accesses the target cell and acquires the system information of the target cell (the SIB13 system information block in the LTE), the UE learns the MCCH transmission period of the target cell, Location information, also knows the MCCH of the target cell The notification message transmission period and location information are updated, but the content of the MCCH information of the target cell is not known. At the same time, it is possible that the UE has missed several MCCH modification periods after accessing the target cell to obtain system information, so that the UE cannot know whether the MCCH information of the target cell and the MCCH of the original cell are in the current MCCH modification period of the target cell. The information comparison has been updated. According to the present invention, the UE should receive the MCCH information at the MCCH repetition period opportunity during the current MCCH modification period to detect whether the MBMS service session start information of the UE is already included. If all the MCCH repetition period and the MCCH update notification message have been missed in the current MCCH modification period, the UE receives the MCCH information in the next MCCH modification period; if all the MCCH update notification messages are missed in the current MCCH modification period, there are still some The MCCH repetition period is not missed, then the UE should receive the MCCH information at the MCCH repetition period opportunity received in the current MCCH modification period, and receive the MCCH information in the next MCCH modification period; if there is a partial MCCH update notification in the current MCCH modification period The message and the MCCH repetition period are not missed, then the UE should receive the MCCH information at the MCCH repetition period opportunity in the current MCCH modification period, and receive the MCCH update notification message without missing, and further, if the UE does not accurately resolve the MCCH update notification message that is not missed. Then, the UE receives the MCCH update notification message and the MCCH information in the next MCCH modification period.

When the UE is located at the edge of the cell, the MCCH update notification message is different from the MCCH. Whether the information includes the MBMS service session start information that the UE is interested in. The operation is the same as above, and will not be described here.

After the scheme is used, for the UE that is listening to the MCCH update notification message, when it is impossible to determine whether the MCCH information in the current MCCH modification period includes the information about the start of the MBMS session that is of interest to the UE, the UE should arrive at the MCCH repetition period as soon as possible. Receive MCCH information. In this way, the UE can obtain the MCCH information as soon as possible, and determine whether the MBMS that is of interest to the user has started the session, and has certain timeliness.

The invention is further described below by several application examples

Application example 1 This application example describes the missed MCCH information reception caused by the missed MCCH update notification message caused by the UE handover or cell reselection, and the MBMS reception is missed.

The LTE protocol stipulates that the UE may be in an idle state (RRC_IDLE) or a connected state (RRC_CONNECTED) when receiving the MBMS service, and the UE in the idle mode needs to perform cell reselection when the UE moves between cells, and the UE in the connected state is in the inter-cell. When moving, a cell handover is required. When performing cell handover or reselection, the UE cannot obtain the MCCH update notification message of the target cell (referred to as the original cell of the UE, and the cell to which the UE is to be handed over as the target cell). After entering the target cell, the system information of the MCCH update notification message of the target cell (the information is carried in SystemInformationBlockTypel3, referred to as SIB13 in LTE) is obtained, and the information about the sending period and location of the MCCH update notification message of the target cell is obtained. In order to start receiving the MCCH update notification message of the target cell, the UE needs to receive a certain delay when the UE receives the SIB13 of the target cell. Therefore, the delay may cause the UE to miss all MCCH update notifications in one MCCH modification period of the target cell. The message, so that the UE cannot determine whether the upcoming MCCH information is updated, and whether the session start information of the MBMS that the UE is interested in is already included.

According to the present invention, in the above case, when the UE cannot determine whether the MCCH information of the UE is included in the MCCH information in the current modification period of the MCCH, the UE should receive the MCCH information in the modification period. The MCCH information may be received at the upcoming MCCH repetition period; or, the UE may not determine whether the MCCH information in the next MCCH modification period includes the MBMS session of interest to the UE before the next modification period of the MCCH of interest. When starting the information, the UE should receive the MCCH information in the next MCCH modification period that is coming, and specifically receive the MCCH information at the first MCCH repetition period opportunity in the next MCCH modification period.

Specifically, after the UE enters the target cell, the MCCH information is acquired during the MCCH repetition period; or, after the UE enters the target cell, the content in the MCCH information in the current MCCH modification period cannot be determined, as shown in FIG. During the MCCH modification period, the MBMS related information in the SIB13 is received, and only the transmission period of the MCCH information of interest is known, and it is not determined whether the MCCH of interest transmitted in the current period includes the MBMS session start information of interest to the UE. Therefore, the UE needs to acquire MCCH information in the next upcoming MCCH repetition period; When the UE enters the target cell and can determine the MCCH information content in the current MCCH modification period, and the current MCCH information does not have the MBMS session start information of interest to the UE, the UE also needs to listen to the MCCH update notification message, but the UE misses the current All MCCH update notification messages within the MCCH modification period, at which time the UE should receive MCCH information within the upcoming MCCH modification period. When the UE cannot determine whether the MCCH information in the next upcoming MCCH modification period is updated after the UE enters the target cell, the UE should acquire the MCCH information in the next MCCH modification period.

According to the method described above, the UE may be configured to obtain the MCCH information in a timely manner after the UE enters the target cell and does not know whether the MCCH information is updated during the handover or reselection. The MBMS session start information, if any, can enable the UE to acquire MBMS data in time.

Application example 2

This application example describes that the UE misses the MCCH update notification message due to the short-term interference of the UE, and the missed reception of the MCCH information causes the MBMS reception to be missed.

For the UE that is waiting to receive the MBMS, the MCCH update notification message is always monitored according to the LTE protocol. When the MCCH update notification message informs the UE that the MCCH information is updated, the UE will receive the MCCH information and view the MCCH information in the next upcoming MCCH modification period. Does it contain the session start information of the MBMS that I am waiting for?

However, if the UE is subject to short-term interference, such UEs are missing one or more

The MCCH modifies all MCCH update notification messages in the period, so that the UE cannot determine whether the MCCH information has been updated in the upcoming MCCH modification period. Therefore, in this case, the UE should acquire the MCCH information in the next MCCH modification period.

Specifically, in the LTE system, when the UE cannot determine the MCCH update caused by the new MBMS service session start information in the next MCCH modification period, the UE should receive the MCCH information at least once in the next MCCH modification period, and confirm. Whether the MCCH information contains the MBMS session start information of interest to the MCCH information;

The UE may be in any MCCH repetition period timing in the next MCCH modification period. The MCCH information is received, preferably, the UE may receive the MCCH information at the first MCCH repetition period opportunity in the next MCCH modification period.

When the UE cannot determine whether the MCCH information in the current MCCH modification period includes the MBMS session start information of interest, the UE should receive the MCCH information at the next MCCH repetition period in the current MCCH modification period. Further, the UE may also be in the next The MCCH information is received at least once during the MCCH modification period.

According to the method described above, after the UE is subjected to short-term interference, if the MCCH update notification message is missed, the MCCH information is obtained in time to determine whether the MCCH information includes the MBMS session start information that is required by the UE, and if so, then The UE can be made to acquire MBMS data in time.

Application example 3

This application example describes that the UE is located in the cell edge or in the shadow area, causing the UE to miss the MCCH update notification message, and the missed MCCH information is received, and the MBMS reception is missed.

However, according to the current LTE protocol, the MCCH update notification message is sent by the Physical Downlink Control Channel (PDCCH), and does not support MBSFN merging of neighboring cells. Therefore, the average error block is evaluated according to LTE simulation. The rate is 2%, especially in the cell edge and shadow area, the probability that the UE receives the MCCH update notification message is still quite large. The opposite MCCH information and MBMS data are sent through the Physical Multicast Channel (PMCH), and support MBSFN merging of neighboring cells, so there is still good signal quality in the cell edge and shadow area. .

Therefore, when a UE that is listening to the MCCH update notification message is in the cell edge or in the shadow area, it is possible to reduce the signal quality of the MCCH update notification message. The MCCH update notification message is often incorrectly received, causing the MCCH update notification message not to be correctly learned during the current MCCH modification period, so that the MCCH information cannot be updated when the next MCCH modification period comes.

Thus, according to the present invention, when the UE cannot determine whether the MCCH information is updated in the next MCCH modification period when the next MCCH modification period comes, the MCCH information should be received in the next MCCH modification period to determine whether there is an MCCH information in the MCCH information. Interested MBMS session start information.

According to the method described above, when the MCCH update notification message is not correctly received, the UE may obtain the MCCH information in time to determine whether the MCCH information has been included in the MCCH information. If so, the UE can be made to obtain MBMS data in time.

When there are multiple MCCHs in the original cell or/and the target cell, the MCCH modification period of the present invention is the MCCH modification period of the MBSFN area where the MBMS of the UE is interested; the MCCH and related information of the present invention are all the UE. The MCCH of interest and related information, that is, the MCCH of the MBMS service that the UE is interested in, is not the MCCH and related information that the UE is not interested in.

Industrial applicability

With the technical solution of the present invention, it is possible to ensure that the UE that listens to the MCCH update notification message can avoid receiving the MBMS service that is of interest to itself due to the following reasons: When the UE moves between cells, the process of switching or reselecting to the target cell is performed. Medium; when the UE is in short-term interference; when the UE is in a poor channel quality position, the MCCH update notification message cannot be correctly parsed. Improve the reliability of MCCH information acquisition.

Claims

Claim

1. A method for obtaining multicast control information, comprising:

When the user equipment cannot determine whether the multicast control multicast channel (MCMS) service session start information of interest is included in the multicast control channel (MCCH) information to be transmitted, the user equipment acquires the MCCH information.

2. The method according to claim 1, wherein the method further comprises:

The user equipment receives the MCCH in the upcoming MCCH modification period when the user equipment cannot determine whether the MCCH information is updated in the upcoming MCCH modification period before the arrival of the modification period of the MCCH in which the user equipment is interested. information.

3. The method according to claim 1, wherein the method further comprises:

Before the modification period of the MCCH of the user equipment is interested, the user equipment cannot determine that the MCCH information in the upcoming MCCH modification period is due to the MCCH update caused by the new MBMS service session start information, where the user equipment is The MCCH information is received within the upcoming MCCH modification period.

4. The method according to claim 2 or 3, wherein the method further comprises:

When the user equipment cannot determine whether the MCCH information in the MCCH modification period of interest contains the MBMS session start information of interest, the user equipment receives the MCCH information at the incoming MCCH repetition period within the current MCCH modification period.

5. The method of claim 2, wherein

The step of receiving MCCH information in an upcoming MCCH modification period includes: receiving MCCH information at a first MCCH repetition period within an upcoming MCCH modification period; and an MCCH modification period includes a plurality of MCCH repetition periods.

The method of claim 1, wherein the method further comprises:

When the user equipment cannot determine whether the MCCH information in the MCCH modification period of interest includes the MBMS session start information of interest, the user equipment is about to be within the current MCCH modification period. The MCCH information is received at the incoming MCCH repetition period.

7. The method according to any one of claims 1 to 3, wherein

8. A user equipment for obtaining multicast control information,

9. The user equipment according to claim 8, wherein

The user equipment is configured to: when the modification period of the MCCH of interest is about to arrive and cannot determine whether the MCCH information is updated within the upcoming MCCH modification period, the MCCH information is received during the upcoming MCCH modification period.

10. The user equipment according to claim 8, wherein

The user equipment is configured to: when the modification period of the MCCH of interest is about to come, and cannot determine that the MCCH information in the upcoming MCCH modification period is due to the MCCH update caused by the new MBMS service session start information, The MCCH information is received during the upcoming MCCH modification period.

The user equipment according to claim 9 or 10, wherein

The user equipment is further configured to: when it is not determined whether the MCCH information in the MCCH modification period of interest includes the multimedia broadcast multicast service (MBMS) session start information of interest, the upcoming MCCH repetition in the current MCCH modification period The MCCH information is received at the cycle.

12. The user equipment according to claim 9 or 10, wherein

13. The user equipment according to claim 8, wherein The user equipment is configured to: when the user equipment cannot determine whether the MCCH information in the MCCH modification period of interest includes the MBMS session start information of interest, receive the MCCH at the upcoming MCCH repetition period in the current MCCH modification period. information.

The user equipment according to any one of claims 8 to 10, wherein the user equipment is a user equipment that is listening to the MCCH update notification message to learn whether the MCCH information of the MBSFN area where the MBMS of interest is located is updated. .