CN1905694A - Transmitting method and receiving method for multimedia broadcasting/multicasting service - Google Patents

Abstract

The invention discloses a multimedia broadcast/multicast service (MBMS) service sending method, the method comprising: a1. the network side notifies the UE of the separately allocated MBMS carrier information; a2. the network side receives the session start instruction of the MBMS service session Finally, determine the bearing mode of the current MBMS service; a3. The network side sends service control information and indication information to the UE, and establishes a bearer according to the determined bearing mode, and uses the MBMS carrier to transmit the current MBMS service to the UE. The present invention also discloses a MBMS service receiving method at the same time. By adopting the MBMS service sending and receiving method of the present invention, it can provide various types of MBMS services without affecting other services; Among the rich MBMS services, users can receive the required MBMS services according to their own needs.

Description

Multimedia broadcast/multicast service service sending method and receiving method

technical field

The invention relates to multimedia broadcast/multicast service (MBMS) technology, in particular to a method for sending and receiving an MBMS service based on a single carrier.

Background technique

Multicasting and broadcasting are techniques for delivering data from one source to multiple destinations. In the traditional mobile communication network, the cell multicast service or 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, and this service 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 (Internet), a large number of mobile multimedia services have emerged. Some of these mobile multimedia services require multiple users to receive the same data at the same time, such as video on demand, TV broadcasting, video conferencing, online education, and interactive games. Compared with general data services, these mobile multimedia services have the characteristics of large data volume, long duration, and delay sensitivity. The current Internet Protocol (IP) multicast and broadcast technologies are only applicable to wired IP communication networks, not mobile communication networks, because mobile communication networks have specific network structures, functional entities and wireless interfaces, which are all related to wired communication IP networks. different.

In order to effectively utilize the resources of the mobile communication network, the third generation mobile communication global standardization organization (3GPP) proposed the MBMS of the mobile communication network, thereby providing a point-to-multipoint service in which one data source sends data to multiple users in the mobile communication network , realize network resource sharing, and improve the utilization rate of network resources, especially air interface resources. The MBMS proposed by 3GPP 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.

FIG. 1 is a schematic diagram of a wireless network structure supporting broadcast/multicast services. As shown in FIG. 1, in the existing 3GPP, the wireless network entity supporting broadcast/multicast services is a broadcast/multicast service server (BM-SC) 101, BM-SC 101 is connected with gateway GPRS support node (GGSN, GatewayGPRS Support Node) 102 through Gmb interface or Gi interface, one BM-SC 101 can be connected with multiple GGSN 102; GGSN 102 is connected with serving GPRS support node through Gn/Gp interface (SGSN, Serving GPRSSupport Node) 103 is connected, and a GGSN 102 can be connected with a plurality of SGSN 103; The Uu interface is connected to the UE 106, and the SGSN 103 can also be connected to the Global System for Mobile Communications Enhanced Radio Access Network (GERAN) 105 through the Iu/Gb interface, and then the GERAN 105 is connected to the UE 107 through the Um interface. Wherein, the GGSN and the SGSN belong to the nodes in the core network (CN) in the wireless network.

From the network structure shown in Figure 1, it can be seen that in order to support MBMS services, a mobile network functional entity—broadcast and multicast service center, namely BM-SC, is added in the third generation mobile communication system, and the BM-SC is The content provider's entrance is used to authorize and initiate MBMS services in the mobile network, and transmit MBMS content according to a predetermined time plan. In addition, MBMS-related functions are added to functional entities such as UE, UTRAN, GERAN, SGSN, and GGSN.

MBMS includes a multicast mode and a broadcast mode. In the multicast mode, a user is required to subscribe to a corresponding multicast group, activate a service, and generate corresponding charging information. Due to the difference in business requirements between the multicast mode and the broadcast mode, the respective business processes are also different, as shown in Figure 2 and Figure 3, Figure 2 is a schematic diagram of the business process of the MSMS multicast mode, and Figure 3 is a schematic diagram of the MSMS broadcast mode Business process diagram.

As shown in Figure 2, the processing process involved in the MBMS multicast service includes: Subscription, Service announcement, Joining, Session Start, MBMS notification, data transmission (Data transfer), session end (SessionStop) and user exit (Leaving). Among them, the signing process is used to establish the relationship between the user and the service provider, allowing the user to pre-subscribe the required MBMS service; the service announcement process is used for the BM-SC to announce the currently available services, that is, to notify the user of the relevant MBMS services Information; the user joining process is the MBMS 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 data corresponding to the MBMS service. Create an MBMS UE context for recording UE information; during the session start process, the BM-SC prepares for data transmission, and notifies the network to establish the bearer resources of the corresponding core network and access network; the MBMS notification process is used for the RNC to notify the UE that the MBMS multicast session is about to Start; during the data transmission process, the BM-SC transmits data to the UE through the bearer resources established during the session initiation process. There are two modes for MBMS service transmission 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 traffic channel (MTCH), all UEs that join the multicast service or are interested in the broadcast service can receive it, and the PTP mode sends data through the DTCH logical channel, only A corresponding UE can receive it; the session end process is used to release the bearer resources established in the session start process; the user exit process makes the subscribers in the group leave the multicast group, that is, the user no longer receives multicast data, and this process will MBMS UE context deletion.

As shown in Fig. 3, the process involved in the MBMS broadcast service is similar to that of the MBMS multicast service, except that before the session starts, there is no need to execute the subscription process and the user join process, and after the session ends, the user logout process does not need to be performed.

In the MBMS PTM transmission mode, related radio control information includes service information, access information, radio bearer information, frequency layer convergence (FLC) information, etc. point control channel (MCCH) transmission. Usually, MCCH information is transmitted based on fixed scheduling, and, in order to improve reliability and stability, UTRAN will repeatedly send MCCH information. FIG. 4 is a transmission scheduling diagram of MCCH information. As shown in FIG. 4 , the period for repeatedly sending MCCH information is a repetition period (RP), and complete MCCH information will be sent periodically according to the repetition period. The modification period (MP) is defined as an integer multiple of the repetition period, and the MCCH information must be modified in each modification period. MBMS access information can be sent periodically according to the access information period, and the access information period is an integer division of the repetition period. MCCH scheduling is consistent for all services.

The MCCH information is further divided into key information and non-key information. Among them, the key information is composed of MBMS neighboring cell information (MBMS neighboring cell information), MBMS service information (MBMS service information), MBMS radio bearer information (MBMS radio bearer information). The key information cannot be changed in each modification cycle; the non-key information refers to MBMS access information, which is transmitted in the access cycle, and the access information can be transmitted at any time. Modification, the black-filled squares in Figure 4 represent change information.

At present, the MBMS system is an important attribute of 3GPP Release 6. In other words, MBMS technology is attached to the existing 3G system. MBMS services are carried by existing transmission channels and physical channels, using existing frequency and bandwidth etc. Specifically, as shown in Figure 5, the provision of MBMS services can be divided into three phases:

The first stage is the period before the session starts. In this stage, the network does not provide any MBMS service, and the user may be constantly trying to read MBMS notification information. In this stage, the user can join any service at any time.

The second stage is when UTRAN receives the session start (Session Start) from the core network until UTRAN establishes a radio bearer (RB) for the service. At this stage, the UTRAN will notify the user to receive the MBMS service and perform a counting process on the MBMS service in order to determine the bearer type. At this stage, the UE can respond to counting and receive the MCCH control channel to obtain relevant control information.

The third stage is the most important stage of MBMS. At this stage, users start to receive MBMS services until UTRAN obtains Session Stop from the core network.

From the perspective of UTRAN, the MBMS service transmission process includes the following steps as shown in Figure 6:

Step 601.UTRAN obtains the session start (Session Start) instruction of certain MBMS service session from CN;

Step 602. UTRAN decides whether to carry out the counting process for the MBMS service according to the needs, so as to determine its bearer mode;

Step 603. On the MCCH channel and the MBMS notification indicator channel (MICH), send the relevant control information and the notification indication of the MBMS service change to the UE;

Step 604. Provide the MBMS service on the MTCH using the bearer mode determined by the counting process;

Step 605. After receiving the session stop (Session Stop) instruction sent by the CN, the UTRAN operates according to the bearing mode of the MBMS service: if it is the MBMS service carried by the PTM, the UTRAN notifies the UE to stop receiving the MBMS service through the MCCH channel, and releases the corresponding MBMS service. The RB corresponding to the MBMS service; if the MBMS service is carried by PTP, then the UTRAN initiates the release of the PTP RB and updates the information on the MCCH to ensure that the UE that accesses later receives the information correctly.

From the perspective of the UE, the MBMS service receiving process includes the following steps as shown in Figure 7:

Steps 701-702. The user subscribes to a certain MBMS service and joins the MBMS service;

Step 703. The UE monitors the MICH channel and the MCCH channel to obtain service change indication information, wherein the UE monitors the MICH channel is optional;

Step 704. If the network requires counting, the UE needs to respond according to the network requirements. Here, the UE can be a UE in different modes and states, such as: CELL_PCH in idle mode or RRC connection mode State, CELL_FACH state in RRC connection mode, URA_PCH state in RRC connection mode; whether counting is required will be carried in the change indication information;

Step 705. When the UE finds that the MBMS service it joined has changed, it receives the changed service control information sent by UTRAN on the MCCH control channel, which includes information such as the bearer provision mode of the MBMS service it joined, such as PTM RB information, PTP RB information;

Step 706. After the UE receives the corresponding control information, if the added MBMS service is provided through PTM, the UE receives the MBMS service on the MBMS service channel MTCH; otherwise, the UE receives the MBMS service on the dedicated control channel (DCCH) through PTP. Receive MBMS services;

Step 707. The UE stops receiving the MBMS service after receiving the notification of stopping receiving the MBMS service sent by the UTRAN through the MCCH channel or the DCCH channel.

In the MBMS system, when a certain MBMS service is about to be provided or information changes, it needs to be completed through a dedicated MBMS service notification process. That is to say, the MBMS service notification process is used for the UE to respond to the notification information initiated by the network. The notification information is used to indicate that one or more MBMS services that the UE has joined has changed. The notification information is sent to all UEs, no matter where the UE is. There are two states, namely: URA_PCH state, CELL_PCH state, CELL_FACH state or CELL_DCH state regardless of whether the UE is in idle mode or in RRC connected mode. The MBMS service notification process is mainly completed through the MICH channel and the MCCH channel, and is specifically divided into: a notification process on a public channel and a notification process on a dedicated channel.

As shown in Figure 8, the notification process on the MCCH common control channel includes: UTRAN sends MBMS modification service information to UE through MCCH channel; and sends updated MBMS control information to UE through MCCH channel. Correspondingly, the process of receiving the notification includes: the UE monitors the MCCH channel or monitors the MCCH channel and the MICH channel. Specifically, for a UE in URA_PCH state, CELL_PCH state, CELL_FACH state or CELL_DCH state in idle mode or in RRC connected mode, if When the MBMS service carried by the PTM RB is not received, it is necessary to monitor the MICH channel to obtain notification information; if the MBMS service carried by the PTM RB is not received, and the MICH channel is not monitored, or the service carried by the MBMS PTM RB is being received, then It is necessary to capture the modification information on the MCCH channel, that is, to obtain the notification information.

As shown in Figure 9, the notification process on the DCCH channel includes: UTRAN sends MBMS modification service information to the UE through the DCCH channel; and sends updated MBMS control information to the UE through the MCCH channel. The dedicated notification process is to use the DCCH channel to notify the UE of the frequency information of the MBMS service, notify the UE of the PTM RB bearer establishment information, or request the UE in the PMM idle state to transfer to the PMM connection state to receive the service carried by the PTP RB. Generally, for the UE to receive the general service paging process and the MBMS service notification process, the priority of the general service paging is higher.

For the counting process mentioned in the MBMS service transmission process, the counting specified in the current agreement is to count the specific number of users receiving services in the cell, so as to obtain the correct bearer mode for a certain MBMS service, so as to ensure the effectiveness of air interface wireless resources use. During the MBMS service process, recounting can be performed. The counting process includes the following steps:

a1. When an MBMS service session starts, the UTRAN notifies the UE to respond to counting according to the requirements of the network. Among them, information such as whether to perform counting, which UEs need to perform counting, UE access probability factors, etc., as shown in FIG. 10 , are all periodically sent by the UTRAN to the UE through the MBMS access information on the MCCH channel.

The UE here may be a UE in URA_PCH state, CELL_PCH state, CELL_FACH state or CELL_DCH state in idle mode or in RRC connected mode.

a2. The UE in the idle state establishes an RRC connection, and the UE in the CELL_PCH and URA_PCH states initiates a cell update process to respond to counting.

a3, UTRAN counts the number of users in the current MBMS service context (Context), if it is found that the number of users exceeds the predetermined threshold, then the MBMS service will adopt the PTM bearer mode in this cell and broadcast through the public channel; If the number of users is less than the threshold, the MBMS service will adopt the PTP bearer mode in the cell, and establish a dedicated channel with the UE for data transmission.

Since the MBMS system involves many types of services, from background services such as software download to real-time services such as video browsing, the number of services will continue to increase with the gradual increase of providers. However, at present, MBMS uses existing WCDMA resources, that is, existing transmission channels and physical channels, which result in occupying a large amount of existing wireless resources. In this way, there are two impacts: on the one hand, other existing services will be greatly affected; on the other hand, the types of services that MBMS services can provide at the same time are greatly limited.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method for sending MBMS services, which can provide various types of MBMS services without affecting other services.

Another object of the present invention is to provide a method for receiving MBMS services, so that UE can receive required MBMS services according to its own needs from the provided MBMS services of various types.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A multimedia broadcast/multicast service MBMS business sending method, the method comprises the following steps:

a1. The network side notifies the UE of the separately allocated MBMS carrier information;

a2. After receiving the session start indication of the MBMS service session, the network side determines the bearer mode of the current MBMS service;

a3. The network side sends service control information and instruction information to the UE, establishes a bearer according to the determined bearer mode, and uses the allocated MBMS carrier to transmit the current MBMS service to the UE.

The method further includes step a4: after receiving the session stop instruction, the network side releases the corresponding radio bearer according to the determined bearer mode.

In the above solution, before step a1, it further includes: the network selects a dedicated frequency segment as an MBMS carrier allocated solely to the MBMS service. The MBMS carrier information in step a1 is notified to the UE through a broadcast channel or a control channel.

In the above solution, the determination of the bearing mode of the MBMS service in step a2 is that the network side determines the bearing mode of the MBMS service through a counting process; or directly determines the bearing mode of the MBMS service according to the MBMS service type. In step a2, the network side determines the bearer mode of the MBMS service through a counting process. The counting process is performed on the MBMS carrier, or on the non-MBMS carrier, or on both the MBMS carrier and the non-MBMS carrier. Wherein, the network side determines the counting process to be performed on the MBMS carrier, or on the non-MBMS carrier, or on both the MBMS carrier and the non-MBMS carrier according to the network load and/or service characteristics.

In the above solution, the instruction information in step a3 is sent by MBMS carrier; or the service control information is sent by MBMS carrier; or both the service control information and the instruction information are sent by MBMS carrier. The service control information described in step a3 is transmitted by MBMS carrier and non-MBMS carrier respectively.

In the above solution, the network side receives the MBMS service session start indication and/or session stop indication on the MBMS carrier.

In the above solution, step a4 further includes: the network side sends a notice of stopping receiving MBMS service to UE, and the notice of stopping receiving MBMS service is sent by MBMS carrier. Step a4 further includes: the network side notifies the UE to release the radio bearer through explicit signaling. After step a4, it further includes: the network side decides whether to instruct the UE to switch frequencies, and if so, sends indication information including the designated frequency to the UE, or sends indication information including the algorithm used for frequency selection by the designated UE. Wherein, the network side sends indication information to the UE on the MBMS carrier.

The method further includes: the network side uses the MBMS carrier to notify the UE of the separately allocated MBMS carrier information.

The present invention also discloses a method for receiving an MBMS service, which is characterized in that the network side allocates a separate MBMS carrier and sends the MBMS service on the allocated MBMS carrier; the method also includes:

b21. UE subscribes and joins the current MBMS service;

b22. The UE receives service control information and indication information of the current MBMS service;

b23. The UE receives the current MBMS service on the MBMS carrier according to the determined bearer mode.

The method further includes step b24: after receiving the notification of stopping receiving the MBMS service, the UE stops receiving the current MBMS service and releases the corresponding radio bearer.

In the above solution, the network side assigning a separate MBMS carrier and sending MBMS services on the MBMS carrier specifically includes:

b11. The network side notifies the UE of the separately allocated MBMS carrier information;

b12. After receiving the session start instruction of the MBMS service session, the network side determines the bearer mode of the current MBMS service;

b13. The network side sends service control information and indication information to the UE, establishes a bearer according to the determined bearer mode, and uses the allocated MBMS carrier to transmit the current MBMS service to the UE.

The method further includes step b14: after receiving the session stop instruction, the network side releases the corresponding radio bearer according to the determined bearer mode.

In step b13, the instruction information is sent using MBMS carrier; or the service control information is sent using MBMS carrier; or both the service control information and the instruction information are sent using MBMS carrier; then in step b22, the UE receives the instruction on the MBMS carrier information, or service control information, or service control information and instruction information.

In step b13, part of the service control information is transmitted on MBMS carrier and non-MBMS carrier; then in step b22, UE receives part of service control information on MBMS carrier and non-MBMS carrier respectively.

In the above scheme, in step b21, the UE subscribes to the MBMS service and/or joins the MBMS service by using the MBMS carrier.

In the above solution, before step b23, it further includes: UE judges whether there are other services in progress, if not, then UE switches its own frequency to MBMS carrier, and performs step b23; if yes, then judges whether to receive MBMS services or non-MBMS services, if After receiving the MBMS service, the UE switches its own frequency to the MBMS carrier, and executes step b23, otherwise, ends this process. Wherein, the judging whether there are other services specifically includes: the UE determines whether other non-MBMS services exist through a paging process; and/or determines whether other MBMS services exist through MBMS control information.

In the above solution, in step b24, the UE releases the corresponding radio bearer according to the instruction of the network side, or decides to release the corresponding radio bearer by itself. After step b24, it further includes: the UE switches to the designated frequency according to the instruction of the network side, or the UE switches to the selected frequency according to its own choice. Wherein, the frequency to which the UE is to be handed over is the original frequency of the UE itself, or a frequency determined by an algorithm that satisfies the requirement of evenly distributing the UE to each frequency.

The MBMS service sending method and receiving method provided by the present invention adopt a separately allocated carrier to bear the MBMS service, thus having the following significant beneficial effects:

On the one hand, the MBMS service does not need to occupy the existing wireless resources, and it will not affect the normal operation of other services, which facilitates the effective use of resources by the mobile communication system. Its beneficial effect is far greater than the payment of a single spectrum;

On the other hand, the MBMS service has sufficient radio resources, so that the MBMS system can provide various types of MBMS services. In particular, with the development of communications in the future, multimedia services such as mobile TV will gradually become the mainstream, and providing rich and colorful MBMS services on mobile phones will be the biggest selling point of operators. Only by assigning a separate carrier can more MBMS services be carried Only in this way can the types of MBMS services be richer and more diverse. Moreover, in the present invention, the UE can choose the service it wants to receive the most, so that the UE can receive rich and high-speed MBMS services according to its own needs, and notify the UE in time when the non-MBMS service arrives, so as to ensure that the UE receives to the MBMS service or other services you want most.

Description of drawings

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

Fig. 2 is a schematic diagram of the service flow of the MSMS multicast mode;

FIG. 3 is a schematic diagram of a service flow in the MSMS broadcast mode;

FIG. 4 is a schematic diagram of MCCH information scheduling;

FIG. 5 is a schematic diagram of the MBMS system communication process in the existing R6 version;

FIG. 6 is a schematic diagram of the MBMS service sending process on the UTRAN side in the prior art;

FIG. 7 is a schematic diagram of an MBMS service receiving process at the UE side in the prior art;

FIG. 8 is a schematic diagram of the MBMS service notification process implemented on the MCCH channel;

Fig. 9 is a schematic diagram of the process of realizing MBMS service notification on the DCCH channel;

Figure 10 is a schematic diagram of the counting process in the MBMS system;

Fig. 11 is a schematic diagram of the MBMS service sending process on the UTRAN side in the present invention;

FIG. 12 is a schematic diagram of the MBMS service receiving process at the UE side in the present invention.

Detailed ways

The main idea of the present invention is to introduce a new carrier to carry the MBMS service, that is to say, to transmit the MBMS service by using a separately allocated frequency section. In the present invention, a system that adopts a separately allocated carrier to carry MBMS services is called a single-carrier MBMS system, a frequency segment allocated separately is called an MBMS carrier, and other frequency segments such as those commonly used in the prior art are called non-MBMS carriers. The premise of the present invention is that the UE supports reception on multiple frequency bands.

From the existing MBMS service sending process on the UTRAN side and the MBMS service receiving process on the UE side, it can be seen that many interactive operations are involved between UTRAN and UE, including uplink operations and downlink operations, for example: UTRAN sends control information to UE , indication information, session start/stop indication; the UE subscribes to the MBMS service, the UE joins the MBMS service, and so on. Therefore, the most basic method of the present invention is: only use the MBMS carrier to transmit the MBMS service, but further, the UTRAN can also use the MBMS carrier to transmit various information and instructions to the UE, and all the information and instructions sent by the UTRAN can use the MBMS carrier , or some use MBMS carriers, and some use non-MBMS carriers, for example: session start/stop instructions use MBMS carriers, service control information uses non-MBMS carriers, etc.; similarly, UE subscribes to MBMS services, joins MBMS services, etc. can also use MBMS carrier. UTRAN can also send a part of certain information and instructions on MBMS carriers and non-MBMS carriers at the same time. Correspondingly, UE switches back and forth between the two frequencies to receive information from different carriers. As for when the UE is in which The frequency band reception information UTRAN will notify in advance through the service change indication, and how the UE switches between different frequency bands belongs to the prior art, and will not be repeated here.

The implementation process of the method of the present invention will be further described below in conjunction with some specific embodiments.

Embodiment one:

In this embodiment, only MBMS carriers are used to transmit MBMS services, and other interactive operations are completed on non-MBMS carriers.

The method of the present invention adopting a separate carrier to carry MBMS services actually includes two parallel processes: the MBMS service sending process on the UTRAN side and the MBMS service receiving process on the UE side.

From the perspective of UTRAN, the MBMS service transmission process includes the following steps as shown in Figure 11:

Steps 1101-1102: The network selects a dedicated frequency segment as an MBMS carrier for transmitting MBMS services, and notifies the UE of the selected MBMS carrier information.

Here, the network generally selects appropriate frequency bands to allocate to MBMS services individually according to the needs of operators; it can be selected at any time before the start of MBMS services, or can be selected during network planning according to network size, network characteristics, and the number of frequency bands owned by the network, etc. If the MBMS carrier is pre-selected by other information, if it is determined during network planning, step 1101 can be omitted, as long as the UE is notified of the currently used MBMS carrier each time the MBMS service is transmitted. Even if the network is not well-planned, the selection of dedicated frequency bands for MBMS services is not carried out every time MBMS services are transmitted. After the MBMS carrier is selected, it can be unchanged or re-selected according to needs, but frequent re-selection is not required. , as long as the UE is notified of the currently used MBMS carrier each time the MBMS service is transmitted.

In this embodiment, one uplink frequency segment corresponds to two downlink frequency segments, and the network side needs to coordinate the selected frequency segment with the original uplink and downlink frequency segments. Receive information in one frequency segment, and transmit MBMS service and send service-related control information and instructions in two downlink frequency segments.

In step 1102, the UTRAN may notify the UE of MBMS carrier information through a broadcast channel, or notify the UE through other control channels. At this time, what the UTRAN uses is a non-MBMS carrier.

Of course, if the MBMS carrier has been determined during network planning and has been known to the UE, this step can be omitted, that is, there is no need to notify the UE of the MBMS carrier through the air interface.

Step 1103: UTRAN obtains the session start instruction of a certain MBMS service session from CN.

Step 1104: UTRAN decides whether to count the current MBMS service, so as to determine the bearing mode of the MBMS service.

Here, UTRAN can decide whether to carry out the counting process according to the service type; it can also directly determine the bearer type for a certain MBMS service according to the MBMS service type without going through the counting process.

Step 1105: UTRAN sends MBMS service control information and service change indication information to UE through MCCH channel and MICH channel.

Step 1106: If it is decided to adopt the PTM transmission bearer mode, the PTM bearer establishment process is initiated between UTRAN and UE, and the UTRAN uses the MBMS carrier to transmit the MBMS service on the MTCH channel; if it is decided to adopt the PTP transmission bearer mode, UTRAN and the UE initiate The process of establishing a PTP bearer.

Step 1107: After the UTRAN receives the session stop instruction sent by the CN, the UTRAN operates according to the bearing mode of the MBMS service: if the MBMS service is carried by PTM, the UTRAN notifies the UE to stop receiving the MBMS service through the MCCH channel, and releases the corresponding MBMS service corresponding RB; if the MBMS service is carried by PTP, then the UTRAN initiates the release of the PTP RB and updates the information on the MCCH to ensure that the UE that accesses later receives the information correctly.

In this step, the UTRAN may also notify the UE to release the radio bearer through explicit signaling.

Step 1108: The UTRAN decides whether to instruct the UE to switch frequencies, and if yes, the UTRAN sends the indication information including the specified frequency to the UE, or sends the indication information including the algorithm used by the UE for frequency selection. Wherein, the specified frequency may be the original frequency of the UE, or may be the frequency that the UE determines to return through a certain algorithm on the UTRAN side. An algorithm for evenly distributing UEs to each frequency.

Here, the UTRAN may send the indication on the MBMS carrier or on the non-MBMS carrier, and this step is optional. The UTRAN can decide whether to instruct the UE to transfer to the corresponding frequency and how to instruct the UE to transfer to the corresponding frequency according to factors such as network load conditions.

From the perspective of the UE, the MBMS service receiving process includes the following steps as shown in Figure 12:

Steps 1201-1202: UE subscribes to the MBMS service and joins the MBMS service;

Step 1203: UE monitors MICH channel and/or MCCH channel to obtain service change indication information;

Step 1204: If the network requires counting, the UE needs to respond according to the network requirements; here, the UE can be a UE in different modes and states, such as: CELL_PCH in idle mode or RRC connection mode State, CELL_FACH state in RRC connected mode, URA_PCH state in RRC connected mode, CELL_DCH state in RRC connected mode; and, UE needs to respond to the counting process according to its own capabilities.

Step 1205: If the UE finds that the MBMS service it joined has changed, the UE receives the changed service control information sent by the UTRAN on the MCCH channel, which includes information such as the bearer provision mode of the MBMS service that it joined, such as PTM RB, PTP RB.

Steps 1206-1208: Determine whether there are other services in progress, if not, execute step 1209; if yes, UE will determine whether to receive MBMS services or non-MBMS services according to the service priority, if it is a non-MBMS service, the UE will be on a non-MBMS carrier If the non-MBMS service is received on the Internet, this process ends; if it is an MBMS service, step 1209 is performed.

Here, it is also possible not to judge, that is, to receive the MBMS service directly without considering other services. In this case, steps 1206-1208 can be omitted.

In step 1206, it is judged whether there are other services. The UE can determine whether there are other non-MBMS services through the paging process, and then select the priority between MBMS services and non-MBMS services; There are other MBMS services, and the service priority is selected among MBMS services.

When the UE selects the service priority, it needs to consider MBMS service and non-MBMS service. If the MBMS service is the service it most wants to receive, the UE will switch to the MBMS carrier to receive the MBMS service; if the non-MBMS service is the service it most wants to receive, Then the UE does not need to perform frequency reselection, and ignores the control information of related MBMS services; if the UE is in multiple MBMS services and the service it most wants to receive has not been provided yet, the UE may not transfer to the MBMS carrier.

Step 1209: The UE decides to receive the MBMS service, and it is on the MBMS carrier. Then, the UE first switches its receiving frequency to the MBMS carrier, and then receives the MBMS service on the MBMS carrier, and the UE determines to receive the MBMS service according to the received control information. Channel: If the MBMS service is provided by PTM, the MBMS service is received on the MTCH channel; if it is provided by the PTP method, the MBMS service is received on the DCCH channel.

Step 1210: After receiving the notification of stopping receiving MBMS service sent by UTRAN through MCCH channel or DCCH channel, UE stops receiving current MBMS service, and releases RB according to the clear instruction of UTRAN side or decides by itself.

Among them, the method for the UE to decide to release RBs by itself can adopt the timer method and set a timer. Generally, the timer can be started when it receives the session start instruction, and the RB is released when the timer expires; After receiving the MBMS service, the RB is released.

Step 1211: when the MBMS service ends, the UE switches to a non-MBMS carrier according to the instruction of the UTRAN side or its own choice.

Here, the non-MBMS carrier can be the original frequency of the UE; it can also be the frequency that the UE will return determined by the UTRAN side through a certain algorithm; it can also be the frequency that the UE itself determines according to a certain algorithm after receiving the MBMS service. For the frequency returned, the mentioned algorithm may be a random selection algorithm, a hash algorithm, etc., as long as it is an algorithm that can ensure that UEs are evenly distributed to each frequency. That is to say, according to the instruction of the UTRAN side or its own choice, the UE returns to its original frequency after receiving the MBMS service, or switches to the frequency specified by the UTRAN side or the frequency determined by the UE itself.

In step 1211, the instruction sent by the UTRAN side to the UE may be a specified frequency; it may also specify the algorithm used by the UE for frequency selection. If it is a specified algorithm, the UE will use the specified algorithm for frequency selection, and then switch to its own at a certain frequency.

In practical applications, the counting process described in step 1204 can also be placed after step 1207 and before step 1209, that is to say, it can be determined through the counting process after it is determined that the UE decides to receive the MBMS service and receives it on the MBMS carrier. Bearer mode of the MBMS service.

Embodiment two:

In this embodiment, the UTRAN uses the MBMS carrier to send counting related indication information, and performs counting on the MBMS service on the MBMS carrier, then step 1104 becomes step 1104':

Step 1104': UTRAN decides whether to count the current MBMS service on the MBMS carrier according to needs, so as to determine the bearing mode of the MBMS service. Specifically, if the current MBMS service needs to be counted, the UTRAN sends MBMS access information on the MBMS carrier, and the MBMS access information carries indication information that needs to be counted.

The counting process between UTRAN and UE can be completed on the MBMS carrier, or it can be completed on the MBMS carrier and the non-MBMS carrier respectively. For example, the counting instruction is provided on the non-MBMS carrier, and the counting operation is specifically completed on the MBMS carrier. .

Embodiment three:

In this embodiment, the UTRAN uses the MBMS carrier to send the indication information of the MBMS service change to the UE through the MICH channel, and correspondingly, the UE receives the service change information indicated by the network on the MBMS carrier. Then, step 1105 becomes step 1105':

Step 1105': UTRAN uses the MBMS carrier to send the indication information of the MBMS service to the UE through the MICH channel, and uses the non-MBMS carrier to send the service control information of the MBMS service to the UE through the MCCH channel.

Correspondingly, step 1203 becomes step 1203':

Step 1203': UE monitors MICH channel and/or MCCH channel, and obtains service change indication information on MBMS carrier.

Embodiment four:

In this embodiment, the UTRAN uses the MBMS carrier to send the service control information of the MBMS service to the UE through the MCCH channel, and correspondingly, the UE receives the service control information provided by the network on the MBMS carrier. Then, step 1105 becomes step 1105":

Step 1105": UTRAN uses MBMS carrier to send MBMS service control information to UE through MCCH channel, and uses non-MBMS carrier to send MBMS service instruction information to UE through MICH channel.

Correspondingly, step 1205 becomes step 1205':

Step 1205': If the UE finds that the MBMS service it joined has changed, the UE receives the changed service control information sent by the UTRAN through the MBMS carrier on the MCCH channel, which includes information such as the bearer provision method of the MBMS service that it joined, such as PTM RB, PTP RB.

In this embodiment, the UTRAN can send a part of the service control information on the two carriers of the MBMS carrier and the non-MBMS carrier, and correspondingly, the UE can receive a part of the service control information on the two carriers.

Embodiment five:

In this embodiment, the UTRAN uses the MBMS carrier to send the MBMS service change indication information and service control information to the UE. Correspondingly, the UE receives the service change information and the changed service control information indicated by the network on the MBMS carrier. Then, step 1105 becomes step 1105'':

Step 1105: UTRAN sends MBMS service control information and indication information to UE through MCCH channel and MICH channel by using MBMS carrier.

Correspondingly, step 1203 becomes step 1203':

Step 1203': UE monitors MICH channel and/or MCCH channel, and obtains service change indication information on MBMS carrier.

Step 1205 becomes step 1205':

Step 1205': If the UE finds that the MBMS service it joined has changed, the UE receives the changed service control information sent by the UTRAN through the MBMS carrier on the MCCH channel, which includes information such as the bearer provision method of the MBMS service that it joined, such as PTM RB, PTP RB.

In this embodiment, for the service control information, the UTRAN can send a part of the service control information on the MBMS carrier and the non-MBMS carrier respectively, and correspondingly, the UE can receive a part of the service control information on the two carriers respectively.

Embodiment six:

In this embodiment, the UTRAN receives the session start indication and/or the session stop indication on the MBMS carrier, then step 1103 and/or step 1107 become:

Step 1103': UTRAN obtains a session start indication of a certain MBMS service session from CN on the MBMS carrier.

Step 1107': After the UTRAN receives the session stop instruction sent by the CN on the MBMS carrier, the UTRAN operates according to the bearing mode of the MBMS service: if the MBMS service is carried by PTM, the UTRAN notifies the UE to stop receiving the MBMS service through the MCCH channel, and Release the RB corresponding to the corresponding MBMS service; if the MBMS service is carried by PTP, then UTRAN initiates the release of the PTP RB and updates the information on the MCCH to ensure that the UE that accesses later receives the information correctly.

Embodiment seven:

In this embodiment, the UTRAN uses the MBMS carrier to notify the UE to stop receiving the MBMS service through the MCCH channel, then step 1107 becomes step 1107":

Step 1107": After the UTRAN receives the session stop instruction sent by the CN, the UTRAN operates according to the bearing mode of the MBMS service: if the MBMS service is carried by PTM, the UTRAN uses the MBMS carrier to notify the UE to stop receiving the MBMS service through the MCCH channel, and releases the MBMS service. The RB corresponding to the corresponding MBMS service; if the MBMS service is carried by PTP, then UTRAN initiates the release of the PTP RB and updates the information on the MCCH to ensure that the UE that accesses later receives the information correctly.

Embodiment eight:

In this embodiment, the UTRAN establishes a PTM bearer or a PTP bearer on the MBMS carrier, then step 1106 becomes step 1106':

Step 1106': If it is decided to adopt the PTM transmission bearer mode, initiate a PTM bearer establishment process between UTRAN and UE, establish a PTM bearer on the MBMS carrier, and UTRAN uses the MBMS carrier to provide MBMS services on the MTCH channel; if it decides to adopt PTP transmission In the bearer mode, the process of establishing a PTP bearer is initiated between the UTRAN and the UE, and the PTP bearer is established on the MBMS carrier.

Embodiment nine:

In this embodiment, the UE uses the MBMS carrier to subscribe to the MBMS service and/or joins the MBMS service, then step 1201 and/or step 1202 becomes: the UE uses the MBMS carrier to subscribe to the MBMS service, and/or the UE uses the MBMS carrier to join the MBMS service.

Embodiment nine:

Based on the third, fourth and fifth embodiments, when the UTRAN uses the MBMS carrier to send indication information and/or service control information to the UE, the UTRAN can further use the MBMS carrier to send the separately allocated MBMS carrier information to the UE.

UTRAN can notify UE MBMS carrier information through broadcast channel, and can also notify UE through other control channels.

Embodiment ten:

In this embodiment, the UTRAN may further decide to perform counting on the non-MBMS carrier, on the MBMS carrier, or on both frequencies according to factors such as network load and service characteristics.

The various implementation solutions described in the above ten embodiments may be applied independently or in combination with each other. For example: MBMS service can only be transmitted using MBMS carrier, and all other interactive operations between UTRAN and UE are completed in the original frequency band as in the prior art; MBMS service and MBMS service control information can also be transmitted using MBMS carrier , or transmit MBMS service, MBMS service control information, UE subscribes to MBMS service, UE joins MBMS service all adopt MBMS carrier and so on. In a word, based on the first embodiment, the ten embodiments can be combined with each other arbitrarily to further form a new implementation solution.

The method of the present invention can be applied to mobile communication systems such as WCDMA, CDMA2000, UTRATDD, and TD-SCDMA. The above description is only a preferred embodiment of the present invention, and is not used to limit the protection scope of the present invention.

Claims (38)

1, a kind of multimedia broadcast/multicast service MBMS business transmission method, it is characterized in that, this method comprises the following steps: a1. The network side notifies the UE of the separately allocated MBMS carrier information; a2. After receiving the session start indication of the MBMS service session, the network side determines the bearer mode of the current MBMS service; a3. The network side sends service control information and instruction information to the UE, establishes a bearer according to the determined bearer mode, and uses the allocated MBMS carrier to transmit the current MBMS service to the UE. 2. The method according to claim 1, further comprising: a4. After receiving the session stop instruction, the network side releases the corresponding radio bearer according to the determined bearer mode. 3. The method according to claim 1 or 2, further comprising: before step a1, the network selects a dedicated frequency segment as an MBMS carrier allocated solely to MBMS services. 4. The method according to claim 1 or 2, characterized in that the MBMS carrier information in step a1 is notified to the UE through a broadcast channel or a control channel. 5. The method according to claim 1 or 2, wherein the determination of the bearing mode of the MBMS service in step a2 is that the network side determines the bearing mode of the MBMS service through a counting process; or directly determines the MBMS service type according to the MBMS service type. The way the business is carried. 6. The method according to claim 1 or 2, characterized in that in step a2, the network side determines the bearer mode of the MBMS service through a counting process, and the counting process is performed on an MBMS carrier or a non-MBMS carrier , or on two carriers of the MBMS carrier and the non-MBMS carrier. 7. The method according to claim 6, wherein the network side determines the counting process to be performed on the MBMS carrier, or on the non-MBMS carrier, or on the MBMS carrier and the non-MBMS carrier according to the network load and/or service characteristics. on two carriers. 8. The method according to claim 1 or 2, characterized in that, in step a3, the indication information is sent using MBMS carrier; or the service control information is sent using MBMS carrier; or both the service control information and the indication information are sent Send using MBMS carrier. 9. The method according to claim 1 or 2, characterized in that in step a3, a part of the service control information is transmitted by MBMS carrier and non-MBMS carrier. 10. The method according to claim 1 or 2, characterized in that the network side receives the MBMS service session start indication and/or session stop indication on the MBMS carrier. 11. The method according to claim 2, further comprising: the network side sending a notice of stopping receiving MBMS service to UE, and the notice of stopping receiving MBMS service is sent by MBMS carrier. 12. The method according to claim 2, further comprising: the network side notifies the UE to release the radio bearer through explicit signaling. 13. The method according to claim 2, further comprising: after step a4, the network side decides whether to instruct the UE to switch frequencies, and if so, sends instruction information containing the specified frequency to the UE, or sends a message containing the specified frequency to the UE. An indication of the algorithm used for frequency selection. 14. The method according to claim 13, wherein the network side sends the indication information to the UE on the MBMS carrier. 15. The method according to claim 1 or 2, further comprising: the network side uses the MBMS carrier to notify the UE of the separately allocated MBMS carrier information. 16. A method for receiving an MBMS service, characterized in that the network side allocates a separate MBMS carrier and sends the MBMS service on the allocated MBMS carrier; the method also includes: b21. UE subscribes and joins the current MBMS service; b22. The UE receives service control information and indication information of the current MBMS service; b23. The UE receives the current MBMS service on the MBMS carrier according to the determined bearer mode. 17. The method according to claim 16, further comprising: b24. After receiving the notification of stopping receiving the MBMS service, the UE stops receiving the current MBMS service and releases the corresponding radio bearer. 18. The method according to claim 16, wherein the network side allocating a separate MBMS carrier and sending MBMS services on the MBMS carrier specifically comprises: b11. The network side notifies the UE of the separately allocated MBMS carrier information; b12. After receiving the session start instruction of the MBMS service session, the network side determines the bearer mode of the current MBMS service; b13. The network side sends service control information and indication information to the UE, establishes a bearer according to the determined bearer mode, and uses the allocated MBMS carrier to transmit the current MBMS service to the UE. 19. The method of claim 18, further comprising: b14. After receiving the session stop instruction, the network side releases the corresponding radio bearer according to the determined bearer mode. 20. The method according to claim 18 or 19, characterized in that before step b11, it further comprises: the network selects a dedicated frequency segment as an MBMS carrier allocated solely to the MBMS service. 21. The method according to claim 18 or 19, characterized in that the MBMS carrier information in step b11 is notified to the UE through a broadcast channel or a control channel. 22. The method according to claim 18 or 19, characterized in that the determination of the bearing mode of the MBMS service in step b12 is that the network side determines the bearing mode of the MBMS service through a counting process; or directly determines the MBMS service type according to the MBMS service type. The way the business is carried. 23. The method according to claim 18 or 19, characterized in that in step b12, the network side determines the bearer mode of the MBMS service through a counting process, and the counting process is performed on the MBMS carrier or on the non-MBMS carrier , or on two carriers of the MBMS carrier and the non-MBMS carrier. 24. The method according to claim 23, wherein the network side determines the counting process to be performed on the MBMS carrier, or on the non-MBMS carrier, or on both the MBMS carrier and the non-MBMS carrier according to the network load and/or service characteristics. on two carriers. 25. The method according to claim 18 or 19, characterized in that, the instruction information in step b13 is sent by MBMS carrier; or the service control information is sent by MBMS carrier; or both the service control information and the instruction information are sent Use MBMS carrier to send; Then in step b22, the UE receives indication information, or service control information, or service control information and indication information on the MBMS carrier. 26. The method according to claim 18 or 19, characterized in that, the service control information in step b13 is transmitted by MBMS carrier and non-MBMS carrier respectively; Then in step b22, the UE receives part of the service control information on the MBMS carrier and the non-MBMS carrier respectively. 27. The method according to claim 18 or 19, wherein the network side receives the MBMS service session start indication and/or session stop indication on the MBMS carrier. 28. The method according to claim 19, characterized in that step b14 further comprises: the network side sends a notice of stopping receiving MBMS service to UE, and the notice of stopping receiving MBMS service is sent by MBMS carrier. 29. The method according to claim 19, further comprising: the network side notifies the UE to release the radio bearer through explicit signaling in step b14. 30. The method according to claim 19, characterized in that after step b14, it further comprises: the network side decides whether to instruct the UE to switch frequencies, and if so, sends instruction information containing the specified frequency to the UE, or sends a message containing the specified frequency to the UE. An indication of the algorithm used for frequency selection. 31. The method according to claim 30, wherein the network side sends the indication information to the UE on the MBMS carrier. 32. The method according to claim 18 or 19, characterized in that the MBMS service transmission process further comprises: the network side uses the MBMS carrier to notify the UE of the separately allocated MBMS carrier information. 33. The method according to any one of claims 16 to 19, characterized in that in step b21, UE subscribes to MBMS service and/or joins MBMS service by using MBMS carrier. 34. The method according to any one of claims 16 to 19, characterized in that before step b23, it further comprises: UE judges whether there are other services in progress, if not, UE switches its own frequency to MBMS carrier, and performs step b23 ; If yes, judge whether to receive MBMS service or non-MBMS service, if receive MBMS service, then UE will switch its own frequency to MBMS carrier, execute step b23, otherwise, end this process. 35. The method according to claim 34, wherein the judging whether there are other services specifically includes: the UE determines whether there are other non-MBMS services through the paging process; and/or determines whether there are other non-MBMS services through the MBMS control information MBMS business. 36. The method according to claim 17, wherein in step b24, the UE releases the corresponding radio bearer according to the instruction of the network side, or decides to release the corresponding radio bearer by itself. 37. The method according to claim 17, further comprising: after step b24, the UE switches to the designated frequency according to the instruction of the network side, or the UE switches to the selected frequency according to its own choice. 38. The method according to claim 30 or 37, wherein the frequency to which the UE is to be handed over is the original frequency of the UE itself, or a frequency determined by an algorithm that satisfies the uniform distribution of the UE to each frequency.

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