CN101166174A - Control method and system for multicast broadcast service - Google Patents

Abstract

The invention relates to the field of wireless communication, and discloses a control method and a control system for multicast broadcast services, which enable a base station to correctly send control information of MBS services. In the invention, the base station transmits the MBS control information to the terminal through a broadcast channel, a multicast channel, a transmission channel or a channel of an MBS multicast group. The MBS control information may be a service control information change indication, a service announcement, an MBS service session start/end identifier, a mode switching indication of PTP and PTM, a statistics indication, etc.

Description

Control method and system for multicast broadcast service

technical field

The invention relates to the field of wireless communication, in particular to the multicast broadcasting technology in the microwave access global interoperability system.

Background technique

With the development of communication technology and the increase of user demand, data services have been developed rapidly, and the rapid growth of data traffic has made people's demand for communication bandwidth increasingly high. Broadband access is showing a huge market to the industry. In order to break through the bandwidth bottleneck of the access network, various broadband access technologies have been introduced.

IEEE802.16 is a standard promulgated by the Institute of Electrical and Electronics Engineers ("IEEE") in December 2001 to provide the last mile of wireless broadband access in the metropolitan area network. The IEEE802.16 standard mainly includes three standards: 802.16a, 802.16RevD and 802.16e.

Worldwide Interoperability for Microwave Access ("WiMAX") is a wireless metropolitan area network access technology based on the IEEE 802.16 series of standards. Its basic goal is to provide a point-to-multipoint Broadband wireless access means that can effectively interoperate in a multi-vendor environment.

Specifically, the 802.16 series standards stipulate some protocol layers of the air interface of the WiMAX system, mainly including a physical layer (PHY) and a medium access control (Medium Access Control, "MAC") layer. Among them, the PHY layer physically completes signal modulation and demodulation, codec and other operations, while the MAC layer mainly completes the media access control function of the WiMAX system.

Figure 1 shows the WiMAX end-to-end reference model. Among them, the R1 interface is a wireless air interface, which is mainly defined by IEEE802.16d/e. The rest of the interfaces are all wired interfaces.

As shown in the figure, WiMAX mainly includes mobile station (Mobile Station, referred to as "MS") / subscriber station (Subscribe Station, referred to as "SS"), access service network (Access Service Network, referred to as "ASN") and connection service network (Connectivity Service Network, referred to as "CSN").

Among them, ASN is defined as a collection of network functions that provide wireless access services for WiMAX user terminals. ASN includes BS and ASN Gateway (ASN GateWay referred to as "ASN-GW") network elements. An ASN may be shared by multiple CSNs.

The main functions of the ASN include the functions of the BS and the functions of the ASN-GW. Among them, the functions of BS include: providing L2 connection between BS and user station SS/MS, radio resource management, measurement and power control, and air interface data compression and encryption. The functions of ASN-GW include: providing proxy (proxy) function for SS/MS verification, authorization and accounting functions; supporting NSP network discovery and selection; providing L3 information relay (Relay) function for SS, such as IP address allocation , radio resource management.

In addition, it can also include (non-required functions): intra-ASN handover; SS paging and location management, such as paging controller (Paging Controller, referred to as "PC") functional entity; tunnel management between ASN-CSN, It is equivalent to the foreign agent (FA) in the mobile IP technology; the visitor location registration is the anchor SFA functional entity.

CSN is defined as providing IP connection services for WiMAX user terminals. CSN mainly provides the following functions: SS/MS IP address allocation, Internet access, authentication, authorization, accounting protocol (Authentication, Authorization, Account, referred to as "AAA") proxy (proxy) or service (server), user-based Authorization control, ASN-to-CSN tunnel, WiMAX user billing and settlement between operators, tunnel between CSNs in roaming, handover between ASNs, and various WiMAX services (such as location-based services, multimedia Multicast and broadcast services, IP Multimedia Subsystem services).

MS/SS is a (mobile) terminal, and the user uses this terminal to access the WiMAX network.

The WiMAX and its network architecture have been described above, and the following is a brief introduction to the Multicast & Broadcast Service ("MBS").

What people usually call communication is the communication between one node and another node, but with the increase of user demands and the introduction of multiple media, users need to carry out one-to-many or many-to-many communication, resulting in Point to Multipoint (Point to Multipoint, referred to as "PTM") transmission mode. In order to support these modes on the mobile network, realize one-to-many multicast broadcast service, and at the same time, in order to effectively utilize mobile network resources, the prior art defines MBS service on the basis of WiMAX. The MBS service is a point-to-multipoint service that provides a data source to send data to multiple users in a mobile network, realizes network resource sharing, and improves network resource utilization, especially air interface resources. The MBS defined by WiMAX can not only realize the multicast and broadcast of plain text and low-rate messages, but also realize the multicast and broadcast of high-speed multimedia services, which undoubtedly conforms to the trend of future mobile data development.

The MBS service based on the WiMAX network supports two access modes: single base station access and multiple base station access. In the multi-base station access mode, the concept of MBS domain (that is, MBS Zone, identified by MBS ZoneID) is defined. An MBS domain is a collection of base stations. All base stations in an MBS domain use the same Multicast CID and MBS group The security alliance (MBS Group Security Association, referred to as "MBS GSA") sends the content of the same MBS service flow, and the terminal registered for the MBS service can receive MBS service data through multiple base stations in the MBS domain, and the terminal in the idle state is in the MBS When moving across base stations in the domain, there is no need to reestablish the connection, and the MBS service can be received without being affected, and the seamless handover of the MBS service can be realized. Single base station access to MBS is a special case of multi-base station access to MBS. The MBS domain is limited to the coverage of one base station, and all users receiving the MBS in an MBS domain use the same multicast connection ID. The prior art does not describe the single base station mode in detail; however, in the multi-base station mode, there are corresponding descriptions on how the base station sends MBS data, how the terminal receives MBS data, and how the base station notifies the terminal of the interested MBS data transmission.

The main description of the air interface in the existing system is as follows:

First, the DL-MAP broadcast on the broadcast connection indication (broadcast CID) contains zero to one or more MBS-MAP-IEs, and each item on the MBS-MAP-IE is identified by the MBS domain ID;

Second, an MBS-MAP-IE identifies the physical resource for broadcasting an MBS-MAP message on the air interface; if it is a single base station mode, it directly indicates the physical resource of the MBS service;

Third, an MBS-MAP message can contain zero to one or more MBS-DATA-IEs or extended MBS-DATA-IEs, and the physical parameters between these MBS-DATA-IEs can be consistent or inconsistent, determined by the network side decision; but one MBS-DATA-IE has only one physical parameter set;

Fourth, one MBS-DATA-IE contains one or more multicast CIDs; the reason why one MBS-DATA-IE is required to contain one or more multicast CIDs is to reduce the length of the MBS-MAP message. All the multicast CIDs corresponding to the MBS data of the same DIUC are indicated in one MBS-DATA-IE. In terms of data transmission, the MAC protocol data units (Protocol Data Units, referred to as "PDU") that are the same as DIUC are all transmitted on a physical resource Burst (burst), although the data of different MBS services are mixed together in the Burst , but can be distinguished at the MAC layer by the multicast CID on the MAC-PDU header. Not all multicast CIDs correspond to the same MBS service, but each multicast CID corresponds to one MBS service.

Fifth, in an extended MBS-DATA-IE, a multicast CID also includes one or more logical channel IDs. The logical channel ID is used in the air interface, and is used to inform the terminal whether there is content of interest in the MBS data currently indicated;

In addition, zero to one or more MBS domain IDs can be carried on the DCD. According to the provisions of the protocol 802.16e on the content identification Content ID: Content ID corresponds to a group of information such as multicast CID and logical channel ID. Content ID is used to identify the upper layer data flow carried by the service flow (SF) of the WiMAX access network.

The DL-MAP message indicates the physical resource sent by the next MBS-MAP message, but does not distinguish the multicast CID and logical channel ID contained in the MBS-MAP message; The indication of physical resources is different from the indication in DL-MAP in that the MBS-MAP message here is a special MBS-MAP message, which must contain an MBS-DATA-IE that has the same multiple information as the current MBS-DATA-IE. broadcast CID and logical channel ID. In this way, the terminal does not need to receive DL-MAP messages one by one, but only needs to know the sending time of the next concerned MBS-MAP message from the current MBS-MAP-IE.

In addition, there is a change indication in the MBS-DATA-IE. If there is no change, the MBS data will be received directly; otherwise, a new MBS-DATA-IE needs to be parsed to update the relevant MBS information of the terminal.

The above is the main description of the air interface in the MBS system in the existing protocol. However, there is no specific description of how to transmit the control information of the MBS service or the control method of the MBS service in the existing protocol.

Contents of the invention

The technical problem to be solved by the embodiment of the present invention is to provide a multicast broadcast service control method and system thereof, so that the base station can correctly send the control information of the MBS service.

In order to achieve the above technical problems, an embodiment of the present invention provides a method for controlling a multicast broadcast service, including the following steps:

The base station transmits the multicast broadcast service MBS control information to the terminal through the designated channel;

The terminal operates the corresponding MBS service according to the received control information.

Wherein, the specified channel is a broadcast channel;

The base station allocates at least one medium access control layer message type for transmitting MBS control information, and transmits the MBS control information on a corresponding broadcast channel through the allocated message type;

The terminal monitors the broadcast channel, identifies the message type, and receives the MBS control information from the base station.

Also in the method, the designated channel is a multicast channel;

The base station transmits the MBS control information through a designated multicast channel;

The terminal acquires the MBS control information by monitoring the multicast channel.

Also in the method, the designated channel is a transport channel;

The base station transmits the MBS control information through a designated transmission channel;

The terminal acquires the MBS control information by monitoring the transmission channel.

In addition, in the method, the specified channel is a channel of an MBS multicast group;

The base station transmits MBS control information related to the multicast group through a channel of the MBS multicast group;

The terminals joining the multicast group receive the MBS control information through the channel of the multicast group.

In addition, in the method, an extended sub-header is added to the media access control protocol data unit used to transmit services in the channel of the MBS multicast group, and the MBS control information of the multicast group is transmitted through the extended sub-header.

In addition, in the method, the MBS control information is a service control information change indication;

The terminal judges whether at least one specified MBS service changes according to the service control information change indication.

Furthermore, in the method, the MBS control information is a service announcement;

The terminal acquires one of MBS service identifier, service sending time, content identifier, service-related description information or any combination thereof through the service notification.

In addition, in the method, the MBS control information is an MBS service session start/end identifier;

The terminal starts/stops receiving the corresponding MBS service according to the identifier.

In addition, in the method, the MBS control information is a point-to-point and point-to-multipoint mode switching instruction;

According to the instruction of the mode switching instruction, the terminal switches the bearer mode of the corresponding MBS service through the indicated point-to-point/point-to-multipoint mode, and receives the corresponding MBS service on the new bearer.

Further in the method, the control information is a statistical indication;

The terminal responds to the base station according to the statistical instruction information, and supports the base station to count the number of MBS service users.

In addition, in the method, when the base station transmits the MBS control information, it also transmits the MBS service identifier corresponding to the control information and/or the length of the control information.

In addition, in the method, when the base station needs to send service control information change indication, and at least one of service notification, session start/end identification, point-to-point and point-to-multipoint mode switching indication, and statistical indication, The base station first sends the service control information change indication, and then sends other control information;

The terminal determines whether the corresponding MBS service status changes according to the service control information change indication, and if there is a change, continues to receive the subsequent control information, and if there is no change, it does not receive the rest of the control information.

In addition, in the method, each bit in the service control information change indication indicates whether the corresponding one or more pieces of MBS service control information have changed.

In addition, in the method, the corresponding relationship between the MBS service and each bit in the service control information change indication is determined by taking the modulus of the total number of bits of the MBS service identifier and the service control information change indication.

In addition, in the method, the base station sends the control information according to a sending period corresponding to the control information, and changes the control information according to a corresponding change period;

When the control information changes, the base station changes the control information at the beginning of a latest change period;

The terminal receives the control information according to the sending period or the changing period;

The changing period is greater than the sending period.

The present invention also provides a multicast broadcast service control system, which includes a base station and a terminal, and the base station also includes a sending unit, which is used to send the multicast broadcast service MBS control information to the terminal through a designated channel;

The terminal also includes a processing unit, configured to operate the corresponding MBS service according to the control information sent by the base station.

Wherein, the specified channel is one of the following:

A designated broadcast channel, multicast channel, delivery channel, and/or channel of an MBS multicast group.

In addition, in the system, the control information includes one of the following or any combination thereof:

Service control information change instructions, service announcements, MBS service session start/end signs, point-to-point and point-to-multipoint mode conversion instructions, statistical instructions.

Through comparison, it can be found that the main difference between the technical solution of the present invention and the prior art is that the base station transmits the MBS control information to the terminal through a designated channel, so that the terminal can correctly receive the corresponding control information from the base station, and according to the received control information The MBS business corresponding to the information operation ensures efficient control and management of the MBS business, which is conducive to the implementation and development of the MBS business.

The specified channel may be a broadcast channel; by allocating one or more MAC layer message types for transmitting MBS control information, the base station can use the allocated message types to correctly transmit MBS control information on the corresponding broadcast channel; correspondingly, the terminal It can conveniently and accurately receive MBS control information from the base station by monitoring the broadcast channel and identifying the message type.

The specified channel can also be a multicast channel or a transport channel; the base station can designate a single multicast channel or transport channel exclusively for the transmission of MBS control information; so that all terminals can obtain the MBS control information they are interested in by monitoring the channel .

The specified channel can also be the channel of the MBS multicast group; the base station transmits the MBS control information related to the multicast group by adding an extended subheader in the MAC PDU of the transmission service in the channel of the MBS multicast group, because this method does not need Designate a separate channel and only transmit control information through the existing channel, which saves limited network resources and is very suitable when channel resources are insufficient. Moreover, the transmission of control information by this method is highly targeted, and only the terminals joining the multicast group can normally receive the required MBS control information from the channel of the multicast group.

The control information can be a service control information change indication. According to the indication, the terminal can receive other corresponding control information when the MBS service state changes, and no longer receive other control information when the MBS service does not change, which reduces the number of terminals. The operation reduces the load on the terminal.

The control information can be a service announcement, and the terminal can obtain the MBS service identifier, service sending time, content identifier, and service-related description information according to the service announcement, so that the terminal that first enters the base station can know the MBS service information in the base station, so as to The terminal can join and receive the MBS service it is interested in.

The control information may be the start/end identifier of the MBS service session, and the base station controls the terminal to receive and stop the MBS service synchronously through the information, so as to better realize the management of the MBS service.

The control information can be point-to-point (Point to Point, "PTP" for short) and point-to-multipoint (Point to Multipoint, "PTM" for short) mode switching instructions, and the base station can notify in time when the MBS service bearer mode needs to be changed The terminal adopts the corresponding PTP or PTM mode to receive MBS services to ensure smooth service reception and improve reception quality.

The control information can be a statistical indication, and the base station can trigger the terminal in the idle state to feed back to the base station through the statistical indication (usually to perform a location update, which may not carry any content related to MBS service information. The Anchor PC obtains the MBS service information it is receiving), so that the base station can correctly count the number of users of the specified MBS service according to the MBS service information of the terminal.

The base station sends control information according to the transmission period, and changes the control information according to the change period, and the change period is longer than the transmission period, so that the terminal that first enters the coverage of the base station can obtain the required control information in time according to the transmission period, while other terminals can update according to the change period Controlling the content of information reduces the receiving frequency of the terminal and reduces the burden on the terminal.

Description of drawings

FIG. 1 is a schematic diagram of a WiMAX network structure in the prior art;

Fig. 2 is a flow chart of the MBS service control method according to the first embodiment of the present invention;

Fig. 3 is a schematic diagram of the form of sending control information in the MBS service control method according to the first embodiment of the present invention;

Fig. 4 is a structural diagram of an MBS service control system according to a third embodiment of 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 in conjunction with the accompanying drawings.

In the present invention, the base station transmits control information through the broadcast channel, multicast channel, transmission channel or multicast group channel defined by IEEE802.16e, including service control information change indication, service announcement, MBS service session start/end identifier, PTP and PTM mode switching instructions, statistical instructions, the terminal operates its MBS service according to the received control information.

The first embodiment of the present invention will be described below. The first embodiment of the present invention relates to a method for controlling an MBS service, as shown in FIG. 2 .

In step 201, the base station sets corresponding MBS control information according to the requirements of each MBS service, and sends the MBS control information to the terminal through a channel defined by IEEE802.16e.

Wherein, the channel used to transmit the control information may be a broadcast channel, a multicast channel or a transmission channel defined by IEEE802.16e. If it is transmitted through a broadcast channel (such as CID=0xFFFF), the base station needs to allocate at least one MAC layer message type dedicated to the transmission of MBS control information, and transmit the MBS control information on the corresponding broadcast channel through the allocated message type; or the base station can Through the multicast channel or transport channel transmission defined by IEEE802.16e, the control information is directly transmitted at the upper layer.

The sent control information includes MBS service control information change indication, and at least one of service notification, session start/end identification, PTP and PTM mode conversion indication, and statistical indication.

Service control information change indication: Indicate whether the remaining four control information of a certain MBS service have changed, if yes, instruct the terminal to re-read and update the corresponding control information, otherwise the terminal does not need to read the MBS control information again.

Service Announce (Service Announce) information: includes information such as MBS service identification, service start time, content identification, and related descriptions.

PTM and PTP mode conversion indication: Indicates that the base station currently bears the MBS service in PTP or PTM mode. When the base station adopts PTM bearer, the identifier indicates PTM bearer. When the base station adopts PTP bearer, the identifier indicates PTP bearer. When the identifier changes from indicating a PTM bearer to a PTP bearer, the terminal is instructed to exit the PTM mode and establish a PTP connection to receive the MBS service, and vice versa.

Session start/stop (Session start/stop) identification: give the user indication information when the session starts or ends, instructing the user to start receiving the MBS service or stop receiving the MBS service. During the process of the MBS service, the information always indicates the start (start); when the session ends, it always indicates the end (stop).

Counting (Counting) indication information: indicates that the network side now needs to count the number of users receiving a certain MBS service or the number of all users receiving MBS services in idle mode. After receiving this indication, the terminal feeds back the information that it is receiving or preparing to receive the MBS service to the network according to regulations. This information may also include a probability threshold, which is used for the MS to initiate feedback with a certain probability after receiving the indication.

While transmitting the control information, the base station transmits the MBS service identifier corresponding to the control information and the length of the control information, as shown in FIG. 3 . Wherein, the transmitted control information may be organized in the manner of TLV (that is, the type of Type data, the length of Length data, and the value of Value data). In each control information, the base station first sends a service control information change instruction, and the terminal determines whether the MBS service it is interested in changes according to the instruction, and if there is no change, it can no longer receive the subsequent control information. The service control information change indication may contain a plurality of bits, wherein each bit identifies whether a piece of MBS service control information has changed. If the service control information change indication contains 8 bits, it can identify 8 MBS services at most. Each MBS service is mapped to a certain bit through an algorithm. For example, the value of the MBS service identifier mod 8 (the total number of bits indicated by the service control information change) can be mapped to the corresponding bit. When the MBS service identifier is 17 , the MBS service corresponds to the first bit of the service control information change indication (bits start counting from 0). When the transmission of the control information of the MBS service changes, the first bit is set (set to 1), otherwise the bit is reset (set to 0). Since one service control information change indication can indicate multiple MBS services, when the indication is transmitted, the corresponding multiple MBS service identities can be continuously transmitted thereafter.

Then enter step 202, the terminal monitors the corresponding channel, if interested in the MBS service, the terminal first receives the service control information change indication containing the MBS service, and judges whether the MBS service it is interested in changes according to the corresponding bit in the indication , if the corresponding bit position is set, it means that the MBS service has changed and enters step 203; If the terminal has just moved to the coverage area of the base station and receives the service control information for the first time, it does not judge the change indication of the service control information, and directly enters step 203 .

In this step, if the base station transmits the control information through the broadcast channel, the terminal can judge whether there is an unreceived but interested MBS service by monitoring the message of the specified message type (that is, the message type allocated for transmitting MBS control information) on the broadcast channel Or the service control information change indication of the MBS service currently being received, if there is, it will be received in time, if there is no or no interest in these MBS services or no support in terms of capabilities, then ignore these messages.

If the base station transmits control information through a multicast channel or a transport channel, the terminal monitors the multicast channel or transport channel to directly determine whether there is an MBS service that has not been received but is of interest or a service control information change indication of an MBS service that is currently being received , similarly, if there is, receive it in time, if not, or are not interested in these MBS services or do not support them in capability, then ignore the received instructions.

In step 203, the terminal continues to monitor the corresponding channel, and receives the control information of the MBS service it is interested in according to the MBS service identifier after the control information (it can receive one or more of the above-mentioned several kinds of control information), And enter one or more of steps 204 to 207 according to the received control information.

If the terminal receives the MBS service announcement, and the terminal currently needs to receive the MBS service, it enters step 204 and joins the MBS service according to the MBS service identifier, service start sending time, content identifier, and service-related description information in the service announcement.

If the terminal receives the session start/end identifier, it enters step 205, and the terminal receives or stops receiving the corresponding MBS service according to the instruction of the identifier. Through this identification, the terminal user will not need to continuously detect whether there is data to be received in the MBS-MAP message, but only needs to check the service control information change indication. If the indication changes, it will further detect the session start/end identification and perform corresponding reception. Or stop receiving, which is beneficial for the terminal to reduce power consumption.

If the terminal receives the PTP and PTM mode switching instruction, it enters step 206, and the terminal receives the corresponding MBS service through the identified PTP/PTM mode according to the mode switching instruction. If the identification is converted from PTP to PTM bearer, the terminal receives the corresponding MBS service through the PTM mode according to the instruction; if the instruction is converted from PTM to PTP bearer, the terminal in the activated state can directly receive the corresponding MBS service through the PTP bearer according to the instruction , for the terminal in the idle state, it needs to initiate a process of exiting the idle mode, and establish a PTP connection to receive the MBS service.

If the terminal receives the statistical indication and the terminal is an idle terminal, it enters step 207, where the idle terminal feeds back the currently received MBS service information to the network side, and supports the base station to count the number of users receiving the specified MBS service.

It is worth mentioning that since the service control information does not change frequently, generally speaking, the change is not fast, so it is not necessary to send these information in every wireless frame. In this embodiment, different control information is used for different control information. cycle to send. In addition to the sending period, a change period is also defined in this embodiment, and the base station resets the control information according to the corresponding change period. That is to say, when the control information changes, the base station resets the control information in the latest change cycle, and starts sending the reset control information from the latest sending cycle. Wherein, the changing period is longer than the sending period. If the terminal first enters the coverage area of the base station and needs to obtain the control information corresponding to the MBS service, it can receive the control information according to the sending cycle; if the terminal just wants to update in time when the MBS service changes, it can receive the control information according to the change cycle. Therefore, while ensuring that the terminal receives the MBS service correctly, the receiving frequency of the terminal is reduced, and the burden on the terminal is reduced. According to the change frequency of the control information, the change cycle can be several times of the sending cycle.

The second embodiment of the present invention also relates to the control method of the MBS service, which is similar to the first embodiment, the difference is that in the first embodiment, the base station uses a designated channel, such as a designated broadcast channel, multicast channel, The transport channel transmits the control information of all MBS services; and in this embodiment, the base station transmits the MBS control information related to the multicast group through the channel of the multicast group. The base station adds an extended subheader (Extended Subheader) to the MAC PDU of the transmission service, and transmits the MBS control information of the multicast group through the extended subheader. Specifically, in the prior art, IEEE802.16e defines multiple extended subheaders for transmitting channel control information. In this embodiment, a downlink extended sub-header (such as ES Type=7) can be added to transmit the MBS control information related to the multicast group. Through this method, only the terminals that join the multicast group can receive the corresponding control information from the MAC PDU through the corresponding multicast group channel. In this embodiment, the control information sent by the base station does not include service control information change instructions and service notifications, but only includes MBS service session start/end identifiers, PTP and PTM mode switching instructions, and statistical instructions. The operations performed by the terminal after receiving the above three kinds of control information are the same as the steps 205, 206 and 207 in the first embodiment, and will not be repeated here.

The third embodiment of the present invention relates to an MBS service control system. As shown in FIG. 4 , it includes a base station and a terminal, wherein the base station also includes a sending unit for sending the multicast broadcast service MBS control information to The terminal; the terminal also includes a processing unit, configured to operate the corresponding MBS service according to the control information sent by the base station. The base station successfully sends the control information and instructs the terminal to operate the corresponding MBS service according to the control information, so as to ensure efficient control and management of the MBS service, which is beneficial to the implementation and development of the MBS service. Wherein, the sending unit may transmit the control information through one of designated broadcast channel, multicast channel, transport channel, and MBS multicast group channel defined by IEEE802.16e.

The transmitted control information includes one or any combination of the following: service control information change indication, service announcement, MBS service session start/end identification, PTP and PTM mode conversion indication, and statistical indication.

When the processing unit of the terminal receives the MBS service announcement, if the terminal currently needs to receive the MBS service, it joins the MBS service according to the MBS service identifier, service start sending time, content identifier, and service-related description information in the service announcement.

When receiving the session start/end identifier, the processing unit of the terminal receives or stops receiving the corresponding MBS service according to the instruction of the identifier. Through this identification, the terminal user will not need to continuously detect whether there is data to be received in the MBS-MAP message, but only needs to check the service control information change indication. If the indication changes, it will further detect the session start/end identification and perform corresponding reception. Or stop receiving, which is beneficial for the terminal to reduce power consumption.

When the processing unit of the terminal receives the PTP and PTM mode switching instruction, it receives the corresponding MBS service through the indicated PTP/PTM mode according to the instruction of the mode switching instruction. If the identifier is converted from PTP to PTM bearer, the processing unit receives the corresponding MBS service through the PTM mode according to the instruction; if the identifier is converted from PTM to PTP bearer, the active terminal can directly receive the corresponding MBS through the PTP bearer according to the instruction For services, for an idle terminal, its processing unit needs to initiate the process of exiting the idle mode, and establish a PTP connection to receive the MBS service.

When the processing unit of the terminal receives the statistical instruction, if the terminal is an idle terminal, it will feed back the currently received MBS service information to the network side, and support the base station to count the number of users receiving the specified MBS service.

Although the present invention has been illustrated and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the present invention. The spirit and scope of the invention.

Claims (19)

1. A control method for a multicast broadcast service, comprising the following steps: The base station transmits the multicast broadcast service MBS control information to the terminal through the designated channel; The terminal operates the corresponding MBS service according to the received control information. 2. The method for controlling multicast broadcast services according to claim 1, wherein the designated channel is a broadcast channel; The base station allocates at least one medium access control layer message type for transmitting MBS control information, and transmits the MBS control information on a corresponding broadcast channel through the allocated message type; The terminal monitors the broadcast channel, identifies the message type, and receives the MBS control information from the base station. 3. The method for controlling multicast broadcast services according to claim 1, wherein the specified channel is a multicast channel; The base station transmits the MBS control information through a designated multicast channel; The terminal acquires the MBS control information by monitoring the multicast channel. 4. The method for controlling multicast broadcast services according to claim 1, wherein the specified channel is a transmission channel; The base station transmits the MBS control information through a designated transmission channel; The terminal acquires the MBS control information by monitoring the transmission channel. 5. The control method of multicast broadcast service according to claim 1, characterized in that, the designated channel is a channel of an MBS multicast group; The base station transmits MBS control information related to the multicast group through a channel of the MBS multicast group; The terminals joining the multicast group receive the MBS control information through the channel of the multicast group. 6. The control method of multicast broadcast service according to claim 5, characterized in that, in the media access control protocol data unit for transmission service of the channel of MBS multicast group, add an extension sub-header, through the extension The subheader transmits the MBS control information of the multicast group. 7. The method for controlling a multicast broadcast service according to any one of claims 2 to 4, wherein the MBS control information is a service control information change indication; The terminal judges whether at least one specified MBS service changes according to the service control information change indication. 8. The method for controlling a multicast broadcast service according to any one of claims 2 to 4, wherein the MBS control information is a service notification; The terminal acquires one of MBS service identifier, service sending time, content identifier, service-related description information or any combination thereof through the service notification. 9. The method for controlling a multicast broadcast service according to any one of claims 2 to 6, wherein the MBS control information is an MBS service session start/end identifier; The terminal starts/stops receiving the corresponding MBS service according to the identifier. 10. The method for controlling a multicast broadcast service according to any one of claims 2 to 6, wherein the MBS control information is a mode switching instruction between point-to-point and point-to-multipoint; According to the instruction of the mode switching instruction, the terminal switches the bearer mode of the corresponding MBS service through the indicated point-to-point/point-to-multipoint mode, and receives the corresponding MBS service on the new bearer. 11. The method for controlling a multicast broadcast service according to any one of claims 2 to 6, wherein the control information is a statistical indication; The terminal responds to the base station according to the statistical instruction information, and supports the base station to count the number of MBS service users. 12. The method for controlling a multicast broadcast service according to claim 1, wherein, while transmitting the MBS control information, the base station also transmits the MBS service identifier corresponding to the control information, and/or the control message length. 13. The method for controlling multicast broadcast services according to any one of claims 2 to 4, characterized in that, the base station needs to send service control information change indications, service announcements, session start/end identifiers, point When at least one of point-to-point and point-to-multipoint mode switching instructions and statistical instructions, the base station first sends the service control information change instruction, and then sends other control information; The terminal determines whether the corresponding MBS service status changes according to the service control information change indication, and if there is a change, continues to receive the subsequent control information, and if there is no change, it does not receive the rest of the control information. 14. The method for controlling multicast broadcast services according to claim 13, wherein each bit in the service control information change indication indicates whether the corresponding one or more MBS service control information has changed. 15. The method for controlling a multicast broadcast service according to claim 14, wherein the MBS service and the service control information are determined by moduloing the total number of bits indicated by the MBS service identifier and service control information change. The corresponding relationship of each bit in the information change indication. 16. The method for controlling a multicast broadcast service according to any one of claims 1 to 6, wherein the base station sends the control information according to a transmission cycle corresponding to the control information, and changes the control information; When the control information changes, the base station changes the control information at the beginning of a latest change period; The terminal receives the control information according to the sending period or the changing period; The changing period is greater than the sending period. 17. A control system for a multicast broadcast service, comprising a base station and a terminal, wherein the base station further comprises a sending unit, configured to send the multicast broadcast service MBS control information to the terminal through a designated channel; The terminal also includes a processing unit, configured to operate the corresponding MBS service according to the control information sent by the base station. 18. The control system for multicast broadcast services according to claim 17, wherein the specified channel is one of the following: A designated broadcast channel, multicast channel, delivery channel, and/or channel of an MBS multicast group. 19. The multicast broadcast service control system according to claim 17, wherein the control information includes one of the following or any combination thereof: Service control information change instructions, service announcements, MBS service session start/end signs, point-to-point and point-to-multipoint mode conversion instructions, statistical instructions.

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