CN100396161C - A method for realizing broadcast multicast service in mobile communication system - Google Patents

Abstract

The present invention discloses a method for realizing a broadcasting and multicasting service (BCMCS) in a mobile communication system, which comprises the following procedures: a BCMCS supporting function is set in an application layer of an MS; after application layer messages carrying BCMCS associated information are interacted between the MS supporting the BCMCS function in the application layer and a base station (BS) which the MS belongs to, the MS receives a program broadcast by the BS which the MS belongs to through a forward sharing communication channel. The method can realize the BCMCS in the mobile communication system by downloading software under the condition of no modification to a bottom layer of the MS.

Description

A method for realizing broadcast multicast service in mobile communication system

technical field

The present invention relates to the technology of realizing data service in mobile communication system, in particular to a method of realizing broadcast multicast service (BCMCS) in mobile communication system.

Background technique

Mobile communication systems, such as code division multiple access (CDMA) systems or wideband code division multiple access (WCDMA), can provide BCMCS. The network side of the mobile communication system provides BCMCS content by broadcast and multicast, and the mobile station (MS) receives the content of the mobile communication system. The BCMCS content provided by the network side. The BCMCS of the mobile communication system can enable multiple MSs to share the system resources and frequency resources of the mobile communication system, and the mobile communication system can provide various information for a large number of MSs with less system resources.

Utilizing the broadcast function provided by the mobile communication system, there are two ways for the mobile communication system using BCMCS to send BCMCS content on the air interface: idle state broadcast and service state broadcast. Idle state broadcast means that MS receives BCMCS content in idle state, MS and mobile In addition to the establishment of shared channels between communication systems, no other dedicated service channel connections are established. Idle state broadcasting can save the system resources of the mobile communication system to the greatest extent, but the implementation technology is more complicated. Business state broadcasting, also known as business Channel state broadcast means that when MS receives BCMCS content, in addition to the shared channel established with the mobile communication system, it also needs to establish a dedicated service channel, including the basic service channel (FCH) or dedicated control channel (DCCH) connection, Business mode broadcast wastes the system resources of the mobile communication system, but the implementation technology is relatively simple.

3GPP2 has formulated a series of standards for implementing BCMCS using CDMA2000 systems, including CDMA2000 1X and CDMA2000 1X EV-DO systems. Figure 1 is a network structure diagram of a mobile communication system using BCMCS in the prior art: the system consists of mobile stations (MS), Base station (BS), packet data control (PCF), broadcast service node (BSN), multicast router (MR), packet data service network (PDSN), 3A server (AAA), BCMSC controller and content server. Among them, MS is used to receive BCMCS content through BS and play it in real time. At the same time, MS also interacts with BCMCS controller through PDSN. PDSN can allocate Internet Protocol (IP) address and port number for MS; BS includes base transceiver station (BTS) and The base station controller (BSC) realizes the air interface resource management of the mobile communication system and the control of the shared channel; the PCF realizes the connection of the BCMCS content between the BSN and the BS, and realizes the connection of the dedicated data service channel between the PDSN and the BS; BSN receives the BCMCS content from the content server through MR, performs necessary protocol conversion, and forwards it to MS through PCF and BS; BCMCS controller provides BCMCS configuration information to MS through PDSN and provides authentication information of MS through AAA to BSN BCMCS configuration information; content server, providing BCMCS content, and providing BCMCS content to BSN through MR; AAA, storing BCMCS authentication information and MS authentication information, forwarding authenticated BCMCS configuration information between BSN and BCMCS controller.

At present, the implementation of BCMCS in the mobile communication system includes the following processes: 1) Service release or service discovery, the service provider announces that the mobile communication system can provide BCMCS through advertisements, etc., and the MS learns about it through various channels; The network side of the communication system subscribes to the BCMCS, and the mobile communication system writes the MS authentication information for subscribing to the BCMCS into the AAA; 3) service information acquisition, the MS obtains BCMCS related information from the BCMCS controller through the PDSN, such as: the identification of the program flow (BCMCS_FLOW_ID ), multicast IP address and port number, transport layer and application layer protocols, and encryption information, etc.; 4) BCMCS-related system parameter acquisition, BCMCS-related system parameters include: information about program streams available in the MS’s current cell and configuration of shared channels parameters, etc., the BS can send these parameters to the MS in two ways: first, through the common channels of the MS's current cell, such as the paging channel and forward common control channel; second, through the dedicated traffic channel established with the MS, This method requires the MS to first initiate a request to the BS; 5) Receiving the BCMCS content, if the BCMCS content that the MS wants to listen to or/and watch is being broadcast in the current cell, the MS can directly receive the forward shared channel to obtain the BCMCS being broadcast Content; if the BCMCS content desired by the MS is not currently being broadcast, the MS initiates a request to the BS through a call setup message or a registration message, and the BS that receives the request sends the BCMCS content to the MS; 6) The establishment and release of the BCMCS bearer path, BS, PCF The PDSN and the PDSN need to determine the establishment and release of the BCMCS bearer path according to the configuration information of the mobile communication system, the MS request, and the number of MSs receiving BCMCS content. A8 link between PCF, A10 link between PCF and PDSN, and connection between PDSN and content server.

The implementation of BCMCS in the mobile communication system supports both idle state broadcast and service state broadcast.

Since the current MS does not support BCMCS, if BCMCS is to be implemented in the mobile communication system, the MS needs to expand the following functions: 1) The physical layer of the MS needs to support the setting of the long code mask of the forward shared channel and support the information related to the forward shared channel Power control function and reverse pilot gating function; 2) The medium access control (MAC) layer of the MS needs to support the mapping of the BCMCS data flow to the shared channel, which is used to realize the air interface part of the BCMCS bearer path, and needs to support the external calibration The encoding and decoding of code checking is used to add error correction function to BCMCS content; 3) The third layer of MS needs to support BCMCS bearer path management and connection management, and needs to support the system parameters related to BCMCS used to obtain the current cell of MS Layer 3 messages such as the broadcast service parameter message (BSPM) and the broadcast service parameter message (ITBSPM) in the traffic channel need to support the BCMCS registration operation and the expansion of the registration information, and need to support the newly added BCMCS command for providing BCMCS information ( BCMCSOrder), it is also necessary to expand the following layer three messages: Extended System Parameters Message (Extended System Parameters Message), indicating whether the MS mobile communication system network side sends BSPM messages on public channels and specific sending time slots; extended status response messages (ExtendedStatus Response Message), including BCMCS service capability support information; call establishment message (Enhanced Origination Message or Origination Message), supporting broadcast BCMCS content request; paging response message (Page Response Message), feedback broadcast status and related parameters of MS; Extended Channel Assignment Message (Extended Channel Assignment Message), which supports shared channel assignment; In-Traffic System Parameters Message (In-Traffic System Parameters Message) in the traffic channel, indicating whether to support broadcasting of dedicated traffic channels; Power Control Message (Power Control Message) ), indicating the power control channel of the forward shared channel; the Universal Handoff Direction Message (Universal Handoff Direction Message), which supports the handover of the MS receiving the broadcast.

In the process of implementing BCMCS in the mobile communication system, there are many layer 3 messages related to BCMCS, which requires a lot of modification on the third layer of MS to support BCMCS. In addition, some BCMCS messages involve the physical layer and the MAC layer, so the physical layer and the MAC layer of the MS must also be modified, and the development work is very complicated and the workload is heavy.

As mentioned above, in order to implement BCMCS in the mobile communication system, it is necessary to modify the underlying settings of the MS in a large number, and the development work is very complicated and the workload is heavy. If the MS is redesigned in order to support the BCMCS provided by the mobile communication system, there will be problems such as long period, high cost and few styles.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method for implementing BCMCS in a mobile communication system, which can implement BCMCS in a mobile communication system without modifying the bottom layer of MS.

According to above-mentioned purpose, technical scheme of the present invention is achieved like this:

A method for realizing broadcast multicast service BCMCS in a mobile communication system, setting the function of supporting BCMCS at the application layer of MS, the method also includes:

After the MS supporting the BCMCS function at the application layer exchanges the application layer message carrying the BCMCS related information with the base station BS to which it belongs, the MS receives the program broadcast by the BS through the forward shared channel.

The application layer message interacts through the dedicated service channel established between the MS and the BS it belongs to.

The BS to which the MS belongs generates the charging information of the MS according to the connection duration of the established dedicated traffic channel.

The application layer message sent to the MS by the BS to which the MS belongs is broadcast through the paging channel of the cell under its jurisdiction.

When the MS sends an application layer message carrying a request to send a Program status update to its BS, the application layer message is a call setup message or a short message carrying a called number;

The BS to which the MS belongs returns an application layer message carrying Program status update information, and the application layer message is a short message.

When the MS sends an application layer message carrying a request to broadcast Program to its BS, the application layer message is a call setup message or a short message carrying a called number;

The BS to which the MS belongs returns an application layer message carrying the response of the MS sending a request to broadcast Program, and the application layer message is a short message.

Before the BS returns the application layer message, the method further includes:

The BS to which the MS belongs will assign the dedicated traffic channel assigned to the MS to the MS, and return the application layer message to the MS through the dedicated traffic channel assigned to the MS.

When the application layer message sent by the MS to the BS is a short message, the short message carries a telecommunication service identification ID or a characteristic word, and the BS to which the MS belongs determines that the short message carries BCMCS information through the telecommunication service identification or characteristic word carried in the short message short message.

The BS to which the MS belongs broadcasts an application layer message carrying Program status update information through the paging channel of the cell under its jurisdiction. The application layer message is a short message, and the MS directly receives the Program status update information through the paging channel of the cell where it is located.

The process for the MS to receive the Program broadcast by the BS through the forward shared channel is as follows:

a. The BS to which the MS belongs starts the shared channel assignment delay timer Tshch;

b. MS establishes user data protocol socket UDP SOCKET;

c. MS will add the UDP SOCKET established by itself to the multicast group according to the multicast IP address;

d. The assignment delay timer Tshch set by the BS to which the MS belongs expires, and the BS assigns the shared channel allocated to the MS to the MS through an assignment message;

e. The MS receives the Program sent by the network side of the mobile communication system through the assigned shared channel.

Before step a, the method further includes: the BS to which the MS belongs allocates a shared channel and terrestrial link resources for the MS, and connects the Program requested to be broadcast by the MS from the packet data control PCF to the shared channel allocated for the MS.

Before step a, the method also includes:

The network side of the mobile communication system initiates a broadcast instruction to the BS to which the MS belongs;

After receiving the instruction, the BS to which the MS belongs allocates a shared channel and terrestrial link resources for the MS, and connects the Program from the PCF to the allocated shared channel.

The multicast IP address of the MS in step c is preset or allocated by the PDSN during the process of PPP negotiation and IP negotiation with the packet data service network PDSN.

After said step e, the method also includes:

f. The BS to which the MS belongs releases the connection between the MS and the PDSN.

When the MS sends the application layer message to the BS as a power control message, the BS to which the MS belongs gradually increases the power of the forward shared channel.

The method also includes:

If the BS to which the MS belongs fails to receive the power control message sent by any MS within the set time, it will gradually reduce the power of the forward shared channel according to the preset time interval and power step size until it receives the power control message sent by any MS under its jurisdiction. The power signaling message or decrease the power of the forward shared channel to 0.

The MS subscribes to the "Call Waiting" service provided by the network side of the mobile communication system. In the process of receiving the Program broadcast by the BS to which the MS belongs, it also includes the steps of processing incoming calls:

When the MS receives the program broadcast by its BS, there is an incoming call. The BS to which the MS belongs stops broadcasting the Program to the MS, and transfers to the incoming call processing or prompts the MS to have an incoming call. The MS decides whether to stop receiving the broadcast Program and transfers to the MS. Incoming call processing.

The application layer software supporting BCMCS is stored in the network side of the mobile communication system, and the process of setting the function supporting BCMCS at the application layer of the MS is:

The MS downloads the application layer software supporting BCMCS from the network side of the mobile communication system and runs it, and the function of supporting BCMCS is completed after setting.

It can be seen from the above solution that the method provided by the present invention carries BCMCS-related information in application layer messages, such as short messages or call setup messages, so as to realize BCMCS in the mobile communication system. Since the present invention does not set BCMCS-related messages as bottom layer messages like the prior art, such as physical layer, MAC layer and third layer, the MS does not need to modify the bottom layer settings, and BCMCS can also be implemented in the mobile communication system.

Description of drawings

Fig. 1 is the prior art mobile communication system network structural diagram that adopts BCMCS;

Fig. 2 is the flow chart of the method for refreshing the Program state of the present invention;

FIG. 3 is a flowchart of a method for an MS to request and receive a Program in the present invention;

Fig. 4 is a flow chart of the method for realizing static broadcasting in the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the following specific embodiments are given and with reference to the accompanying drawings, the present invention is described in further detail.

In the method provided by the present invention, in order to enable MS to support BCMCS provided by the mobile communication system without modifying the bottom layer of the MS, the BCMCS related information is no longer sent by the message of the bottom layer, but is directly sent by the message of the application layer, that is, between the BS and the MS Send application layer messages carrying BCMCS information between them.

In this way, as long as the MS supports the forward channel long code mask function set by the BS and the application software download function, it can support the function of the application layer message carrying the BCMCS information, thereby being able to communicate with the mobile communication system network side through the BCMCS carrying BCMCS provided by the present invention. Information application layer messages to interact. Of course, the MS must also have the basic ability to support broadcasting. To support video broadcasting, the MS must have image decoding capabilities.

In the present invention, the MS can obtain the function of supporting the application layer message carrying BCMCS from the network side of the mobile communication system through software downloading.

In the present invention, still adopt the system structure shown in Fig. 1, BCMCS content is provided by content server, can be text, audio frequency or video BCMCS data stream.BCMCS data stream is identified by BCMCS_FLOW_ID, and one or more BCMCS data streams form a Program (Program), Program is identified by program ID (Program ID) and Program name, and the corresponding relationship between Program and BCMCS data flow is stored in BCMCS controller. It should be noted that, in the present invention, Program does not refer to specific Program Content, but refers to the carrier or channel that carries a series of Program content, which is equivalent to a TV channel or a radio broadcast frequency, and can also be called a "Program channel" or "channel".

The broadcasting mode adopted by the present invention is service state broadcasting. When MS receives BCMCS content, in addition to establishing the connection of the shared channel with the mobile communication system, it also needs to establish the connection of the dedicated service channel. The shared channel established can be forward FCH, forward For DCCH, forward supplementary channel (SCH) or forward supplementary code division channel (SCCH), the dedicated traffic channel established can be forward reverse FCH or DCCH.

In the present invention, when the BS assigns the forward shared channel to the MS, it notifies the MS of the long code mask used when demodulating the forward shared channel or the method of constructing the long code mask, so that all MSs receiving the same Program use the same long code mask to demodulate the forward shared channel.

There are two ways of program broadcasting, dynamic broadcasting and static broadcasting. Dynamic broadcasting means that the mobile communication system network side only broadcasts the program when there is an MS request to broadcast the program, and the mobile communication system network side releases the broadcast program occupation when there is no MS request to broadcast the program. system resources; static broadcast means that no matter whether the MS requests to broadcast Program, the mobile communication system network side broadcasts the preset Program. Static broadcast is a simplified solution of dynamic broadcast. If the mobile communication system network side supports dynamic broadcast, It can easily support static broadcasting. The process of MS receiving Program will be described in detail below when Program is broadcast in these two broadcasting ways.

Implementation method of dynamic broadcast

The operation process of dynamic broadcasting includes steps such as Program search, Program status refresh, Program request and reception, shared channel power control, and program stop. MS can also process incoming calls during the process of receiving Programs. These steps are described below .

Program search step. The MS inquires from the network side of the mobile communication system which programs the mobile communication system can broadcast, and obtains the detailed information of each Program. These detailed information include: Program name, Program ID, corresponding BCMCS data flow ID, multiple Broadcast IP address, port number, charging information, etc. This step is completely implemented according to the 3GPP2 standard, and all the message processing involved is implemented at the application layer, so there is no need to modify the underlying settings of the MS.

Program status refresh steps. Before MS listens to or/and watches Programs, it first understands which Programs are being played, which Programs can apply for playing, which Programs cannot be played temporarily, etc. These information are sent to the MS by the BS on the network side of the mobile communication system, as shown in the figure 2 is a flow chart of the method for updating the Program state of the present invention, and its specific steps are:

Step 200, the MS initiates a call setup request carrying the called number to the BS, requesting to send a Program status update.

In this step, the called number carried by the MS when initiating a call, the first few digits of the number can be pre-set with a special mark to distinguish the call requesting to send a Program status update from other calls, such as in the called number Add the prefix "***".

In order to reduce the workload of the BS and avoid analyzing the called numbers carried by all calls, it is possible to pre-agree with the MS on the service option (SO) used to initiate a call when sending BCMCS related information, such as using SO=33, so that, When the BS receives the call setup message, it only analyzes the special mark for the call using the agreed SO to determine whether the call carries BCMCS related information, and then according to the specific called number carried by the call, determines whether the call requires Send Program status update.

Step 201, the BS allocates resources for the MS, establishes a terrestrial link, and assigns a dedicated traffic channel to the MS through an assignment message.

In this step, the established terrestrial link is the link between the BSC and the BTS in the BS, and the assignment message is a Layer 3 message, but this assignment process is an existing standard of the mobile communication system, and the MS also supports This function, so there is no need to modify the underlying settings of MS.

In step 202, the BS uses a short message to send Program status update information to the MS through the dedicated traffic channel assigned to the MS.

Since MS can receive short messages at the application layer, there is no need to modify the underlying settings of MS.

Step 203, after receiving the short message sent by the BS, the MS parses out the Program status update information.

Step 204, MS releases the call initiated in step 200.

In step 202, the BS uses a short message to send Program status update information. In the prior art, the BS does not process the short message protocol, and only passes the Data Burst message (Data Burst) to the short message from the mobile service switching center (MSC). Message) for transparent transmission. Data Burst Message includes the following fields: message sequence number (MSG_NUMBER), data type (BURST_TYPE) (short message when it is 000011), message quantity (NUM_MSGS), message length (NUM_FIELDS) and message content (CHARi ).

In the present invention, in order to enable the BS to construct a short message and send it, a fixed short message format is used to construct a Data Burst Message. The method is as follows: the first step, setting MSG_NUMBER to 1; the second step, setting BURST_TYPE to 000011; the third Step 1, set NUM_MSGS to 1; Step 4, fill in the following content (hexadecimal) in the CHARi field in turn: (a) 00: SMS transport layer message type, indicating that this is a point-to-point short message, (b) 00 , 02, XX, XX: telecom service ID field, where XXXX is the specific telecom service ID, and the operator needs to designate a special telecom service ID for the BCMCS service, (c) 02, 06: identification of the short message sender address field And field length, field length is 6, (d) XX, XX, XX, XX, XX, XX: the address of short message sender, in the present invention, short message sender is BS, can adopt a special telephone number To identify, assuming that the 8-digit decimal number 12345678 is used as the sender address, the 6 bytes here are: 02, 08, 50, D9, 61, C0. Other numbers or other address methods can also be used, according to the IS -637 standard to set these contents, the length may also change, thus affecting the content of (c); (e)08, n+9: the identification and length of the data carrier field, where n is the BCMCS information carried in the short message Length; (f) 00, 03, 10, 00, 00: the message ID subfield in the data carrier field, the present invention does not need to use the message ID, but this subfield is mandatory in the short message; (g) 10 , n+2: the identification and length of the user data subfield in the data carrier field, where n is the length of the BCMCS information carried in the short message; (h) XX, XX, XX, ...,: the user data subfield The content of the BCMCS that needs to be sent is placed here. The filling method of these contents is: use 00, n and BCMCS information to form an array, regard the content of the entire array as a binary number string, and shift the binary number to the left by 3 bits, and then set the XX, XX, XX, .... here with each byte in the array

The short message constructed according to the above method complies with the IS-637 standard (that is, 3GPP2 standard C.S0015), and the BS sends the Data Burst Message to the MS, and the application layer of the MS can receive the short message.

When BS constructs a Data Burst Message, it needs to carry a telecommunication service ID. This telecommunication service ID can be used to identify the BCMCS-related information carried by the Data Burst Message. After receiving the Data Burst Message, the MS can use the telecommunication service carried by the Data Burst Message ID determines whether the Data Burst Message is BCMCS-related information or other short messages. The telecom service ID used to carry BCMCS-related information short messages can be specified by the operator. According to IS-41 regulations, it can be between 49152 and 65535 an integer.

Program request and reception. After the MS selects a certain Program, it sends a request broadcast Program to the BS on the network side of the mobile communication system, and the BS responds to the MS according to the current Program broadcast situation and the system resources of the mobile communication system. On the MS side, if the MS receives If the response is that the request is successful, the MS establishes a user data protocol socket (UDP SOCKET), and adds the established UDP SOCKET to the multicast group in order to receive the broadcast Program; on the mobile communication system network side, if the cell where the MS is located is If the program requested by the MS is broadcast, the BS in charge of the cell will assign the forward shared channel carrying the Program to the MS. If the program requested by the MS is not broadcast in the cell where the MS resides, and the system resources allow it, the BS will assign the program to the MS. It is used to carry the shared channel of the program that the MS requests to broadcast and assign the allocated shared channel to the MS.

Fig. 3 is the flow chart of the method for MS requesting and receiving Program in the present invention, and its specific steps are:

Step 300, the MS initiates a call setup request with SO 33 carrying the called number, and requests to broadcast Program.

In this step, the first few digits of the called number carried by the MS when making a call can be pre-set with a special mark to distinguish the call requesting broadcast Program from other calls.

Step 301, the BS allocates resources for the MS, establishes a terrestrial link, assigns a dedicated traffic channel to the MS through an assignment message, sends an A8 establishment request to the PCF, and establishes a connection between the MS and the PDSN.

In this step, it is processed according to the standard of the existing mobile communication system.

In step 302, the BS uses a short message to send a response requesting to broadcast a Program to the MS through the dedicated traffic channel assigned to the MS.

In this step, the way the BS constructs the short message is similar to the way the BS constructs the short message described in Figure 2, except that it carries the response to request broadcasting Program.

Step 303: The BS allocates a shared channel and corresponding terrestrial link resources for the MS, and connects the BCMCS data flow from the PCF, that is, the program that the MS requests to broadcast, to the shared channel allocated for the MS.

In this step, the BS first judges whether the cell where the MS is located is already broadcasting the program that the MS requests to broadcast, if yes, omit the process of allocating shared channels and corresponding terrestrial link resources for the MS in this step, otherwise, execute this step The process of allocating shared channels and corresponding terrestrial link resources for MSs.

The BS also needs to judge whether the program that the MS requests to broadcast has been connected to the BS. If not, it initiates an A10 connection request to the PCF to establish a program carrying the program that the MS requests to broadcast, and connects the BCMCS data stream from the PCF to the shared channel allocated for the MS. Otherwise, omit the operation of initiating an A10 connection request to the PCF in this step, and directly connect the BCMCS data stream from the PCF to the shared channel allocated for the MS.

Step 304, the BS starts the shared channel assignment delay timer Tshch.

The reason for starting the assignment delay timer Tshch is that the shared channel cannot be assigned to the MS immediately, because the PPP negotiation and IP negotiation between the MS and the PDSN have not been completed, and the assignment of the shared channel to the MS will interfere with both. a process.

Step 305, MS establishes UDP SOCKET after receiving the response of request broadcast Program sent by BS through short message.

Step 306: The MS and the PDSN perform PPP protocol and IP negotiation to obtain an IP address, which can be a unicast or multicast IP address.

Before performing PPP negotiation and IP negotiation, the PDSN can authenticate the MS, and the authentication method is the same as that used by the PDSN to authenticate the MS performing common data services in the prior art.

This step is a standard step in the existing mobile communication system.

Step 307, MS adds the UDP SOCKET established by itself to the multicast group.

The purpose of adding the UDP SOCKET established by the MS to the multicast group is to enable the MS to receive multicast IP packets from the shared channel, and the destination address of the multicast IP packets is the multicast IP address.

When the MS does not support multicast IP address setting, that is, does not support the operation of joining a multicast group, the PDSN shall assign a multicast IP address to the MS.

Step 308: The assignment delay timer Tshch set by the BS expires, and the BS assigns the shared channel allocated to the MS to the MS through an assignment message.

The assignment message is a Layer 3 message, but this assignment process is an existing standard in the mobile communication system, and the MS also supports this function, and there is no need to modify the underlying settings of the MS.

Step 309, the MS receives the Program sent by the network side of the mobile communication system through the assigned shared channel, that is, the UDP packet, or multicast IP packet, and plays it.

After the MS receives the UDP packet, the UDP packet is processed by the upper layer protocol according to the existing technology, such as (real-time transport protocol) RTP, and then played: for audio and video broadcasting, it is first decoded by the decoder of the MS according to the existing technology , and then sent to the MS speaker broadcast and display screen; for text broadcasting, it is directly sent to the MS screen display, so that users using the MS can see or/and hear the Program content.

Step 310, the BS releases the A8 link, thereby releasing the connection between the MS and the PDSN, but does not release the air interface resources and the terrestrial link.

Power control of the shared channel. When the MS detects that the power of the forward shared channel is low when receiving the program content, it will send a power control message to the BS, such as a power measurement report, requesting to increase the transmit power. This is supported by existing MSs. operation, so MS does not need to modify the underlying settings.

After receiving the power control message sent by any MS under its jurisdiction, the BS will gradually increase the power of the forward shared channel when the air interface resources of the mobile communication system and the preset power allocation principles and other factors allow it.

If the BS cannot receive the power control message sent by any MS within the set time, it will gradually reduce the power of the forward shared channel according to the preset time interval and power step until it receives the power sent by any MS under its control Control messages or reduce the power of the forward shared channel to 0 to save system resources of the mobile communication system.

The MS has an incoming call when receiving the program. The processing process of the incoming call when the MS is listening or/and watching the Program is the same as when the MS uses ordinary data services, and the pre-set "voice priority" function of the MS is used to ensure no missed calls Incoming calls.

In order to ensure that incoming calls are not missed, the MS needs to subscribe to the "call waiting" service provided by the network side of the mobile communication system. In this way, if the MS receives an incoming call while listening to or/and watching the Program, the mobile communication system stops giving the call to the mobile communication system. The MS broadcasts the Program and transfers to the incoming call process or prompts the MS for an incoming call, and the MS decides whether to stop receiving the broadcast Program and transfers to the incoming call process.

If the MS does not subscribe to the "Call Waiting" service provided by the mobile communication system, there will be an incoming call while listening to or/and watching the Program, but the incoming call cannot be answered, and the originator of the incoming call will hear a busy tone.

Stop receiving Program.BS records the number of allocated shared channels assigned to MS through the counter set by itself. When MS finishes listening or/and watching Program, it sends a call release message to BS through the dedicated traffic channel established with BS, The BS will immediately release the dedicated traffic channel assigned to the MS, but the shared channel assigned to the MS will be released according to the number of MSs recorded by its own counter: if the number of MSs is greater than or equal to 2, the Subtracting the number of MSs by 1 does not release the shared channel; if the number of MSs is 1, the shared channel is released. The call release message is already supported by the existing BS and MS, so the MS does not need to modify the underlying settings.

After the BS releases the shared channel assigned to the MS, it also needs to judge whether it is necessary to release the link resources between the BS and the PCF. The method of checking and releasing follows the standard of the existing mobile communication system.

Implementation method of static broadcast

The shared channel for static broadcasting is pre-allocated. Regardless of whether there is an MS request to broadcast the Program, the Program is also broadcast through the pre-allocated shared channel.

Static broadcasting is controlled by the network side of the mobile communication system. The method for implementing static broadcasting is shown in Figure 4. The specific steps are:

Step 400, the network side of the mobile communication system initiates a start broadcast command to the BS, and the command carries a cell number and a Program ID.

Step 401, after the BS receives the instruction, it executes step 303 in Figure 3: the BS allocates the shared channel and the corresponding terrestrial link resources, and connects the BCMCS data stream from the PCF to the allocated shared channel.

In this way, the Program can be broadcast in the cell through the allocated shared channel.

When the MS wants to request to watch the Program broadcast on the shared channel of the cell, it initiates a request to broadcast the Program to the BS, and the BS executes according to steps 304 to 310 described in Figure 3.

In addition to the process described in Figure 4, there are several differences between the implementation method of static broadcast and the implementation method of dynamic broadcast: 1) the MS cannot watch or/and listen to the Program that is not currently broadcast on the shared channel of the cell where it is located; 2 ) During the program request and receiving process, there is no need to allocate shared channels and apply for BCMCS data streams according to the Program requested by the MS; 3) When the MS stops watching or/and listening to the Program, the BS does not need to release the shared channel of the cell where the MS is located and Program.

Correspondingly, in the implementation method of static broadcasting, it is also necessary to control the power of the shared channel. For static broadcasting, when no MS watches or/and listens to the Program, although the shared channel resources, including WALSH codes and channel units, are always used occupied, but the forward power of the shared channel can be released for use by other MSs.

The power control method of static broadcasting is basically the same as that of dynamic broadcasting. For static broadcasting, when an MS begins to receive the broadcasted Program through a shared channel, the power of this shared channel may be set very low by the mobile communication system, so the BS is increasing the shared channel. When the power of the channel is increased, the step size of the power control is increased so that the MS can receive the broadcast Program as soon as possible. When the power of the shared channel reaches the set power, the BS reduces the step size of the power control.

In the present invention, when the MS watches or/and listens to the Program, it needs to keep the dedicated service channel connection with the BS, and the BS can generate charging information according to the dedicated service channel connection time to charge the MS.

In the present invention, the BS on the network side of the mobile communication system can also broadcast a short message carrying Program status update information through the paging channel of the cell according to the current Program status of each cell. The message structure is similar, the difference is that the pre-set service category is used to identify the broadcast short message to carry BCMCS related information. When the MS needs to refresh the Program state, it only needs to receive the short message broadcast by the cell through the paging channel and follow the instructions in the figure. The steps described in 2 can be analyzed to obtain the program status update information, and there is no need to initiate a call to the BS to request the program status update.

In the present invention, when the MS initiates a request to the BS to update the status of the Program or to broadcast the Program, it may not initiate a call, but use a short message. The existing functions of the MS support the sending of short messages, but the BS receives short messages The process needs to be set by the present invention. The present invention has two ways to realize that the BS receives a short message carrying a request for program status update or a request for broadcast program.

The first method: analyze according to the short message protocol for receiving short messages. After receiving the short message sent by the MS, the BS first parses out the telecommunication service ID, and determines whether the short message carries BCMCS related information according to the telecommunication service ID. If not, It will be processed according to the general short message, otherwise, the request carried in the short message will be parsed.

The second method: feature word matching. When MS sends a short message carrying a request for program status update or a request for broadcast program, add a feature word, and when BS receives the short message, it searches in sequence according to the bit order in the short message , if the characteristic word is found, it is determined that the short message carries BCMCS related information, and the request carried in the short message is parsed out; otherwise, it is processed as a general short message.

In the present invention, if MS does not support the reception of multicast IP packet, then revise PDSN, when PDSN and MS carry out PPP negotiation and IP negotiation, directly assign multicast IP address to MS. The process of assigning multicast IP address is: The MS sets the PPP user name and password. The PPP user name can identify the BCMCS service, and the password can be used to carry the Program ID or the multicast IP address information corresponding to the Program. PSDN judges whether to initiate PPP based on the PPP user name sent by the MS. Negotiation and IP negotiation process carry out special treatment: if the PPP user name identifies the BCMCS service, the PDSN searches or resolves the corresponding multicast IP address according to the preset rules according to the password sent by the MS, and assigns it to the MS. In this way, the MS can Received a multicast IP packet.

In order to implement BCMCS in the mobile communication system, the mobile communication system stores the application layer software supporting BCMCS on the network side of the mobile communication system. When the MS in the mobile communication system wants to use BCMCS, it downloads the application layer software supporting BCMCS from the network side of the mobile communication system. After installing the software, you can receive the Program.

By adopting the method provided by the invention to realize BCMCS in the mobile communication system, the MS does not need to modify the underlying settings or re-develop, thereby reducing the difficulty and workload of development work.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention. within the scope of protection.

Claims (18)

1. a kind of method that realizes broadcast multicast service BCMCS in mobile communication system, it is characterized in that, the function that supports BCMCS is set in the application layer of MS, this method also includes: After the MS supporting the BCMCS function at the application layer and the base station BS to which it belongs exchange information on the application layer carrying BCMCS related information, the MS receives the program Program broadcast by the BS to which it belongs through the forward shared channel. 2. The method according to claim 1, wherein the application layer messages are exchanged through a dedicated traffic channel established between the MS and the BS to which it belongs. 3. The method according to claim 2, wherein the BS to which the MS belongs generates the charging information of the MS according to the established connection duration of the dedicated traffic channel. 4. The method according to claim 1, wherein the application layer message sent to the MS by the BS to which the MS belongs is broadcast through a paging channel of the cell under its jurisdiction. 5. The method according to claim 1, wherein when the MS sends an application layer message carrying a request to send a Program status update to its BS, the application layer message is a call setup message or a short message carrying a called number ; The BS to which the MS belongs returns an application layer message carrying Program status update information, and the application layer message is a short message. 6. The method according to claim 1, wherein when the MS sends an application layer message carrying a request to broadcast Program to its BS, the application layer message is a call setup message or a short message carrying a called number; The BS to which the MS belongs returns an application layer message carrying the response of the MS sending request broadcast Program, and the application layer message is a short message. 7. The method according to claim 5 or 6, wherein before the BS returns the application layer message, the method further comprises: The BS to which the MS belongs assigns the dedicated traffic channel assigned to the MS to the MS, and returns an application layer message to the MS through the dedicated traffic channel assigned to the MS. 8. The method according to claim 5 or 6, wherein when the application layer message sent by the MS to the BS to which it belongs is a short message, the short message carries a telecommunication service identification ID or a feature word, and the BS to which the MS belongs passes the short message. The telecommunication service identifier or characteristic word carried in the message determines that the short message is a short message carrying BCMCS information. 9. The method according to claim 1, wherein the BS to which the MS belongs broadcasts an application layer message carrying Program status update information through the paging channel of the cell under its jurisdiction, the application layer message is a short message, and the MS directly passes The paging channel of the cell where the cell is located receives Program status update information. 10. The method according to claim 1, wherein the process for the MS to receive the program broadcast by the BS through the forward shared channel is as follows: a. The BS to which the MS belongs starts the shared channel assignment delay timer Tshch; b. MS establishes user data protocol socket UDP SOCKET; c. MS will add the UDP SOCKET established by itself to the multicast group according to the multicast IP address; d. The assignment delay timer Tshch set by the BS to which the MS belongs expires, and the BS assigns the shared channel allocated to the MS to the MS through an assignment message; e. The MS receives the Program sent by the network side of the mobile communication system through the assigned shared channel. 11. The method according to claim 10, characterized in that, before step a, the method further comprises: the BS to which the MS belongs allocates shared channels and terrestrial link resources for the MS, and broadcasts the MS request from the packet data control PCF Program is connected to the shared channel allocated for MS. 12. The method according to claim 10, characterized in that, before step a, the method further comprises: The network side of the mobile communication system initiates a broadcast instruction to the BS to which the MS belongs; After receiving the instruction, the BS to which the MS belongs allocates a shared channel and terrestrial link resources for the MS, and connects the Program from the PCF to the allocated shared channel. 13. The method according to claim 10, characterized in that the multicast IP address of the MS in step c is preset or assigned by the PDSN during the process of PPP negotiation and IP negotiation with the packet data service network PDSN of. 14. The method according to claim 10, characterized in that, after said step e, the method further comprises: f. The BS to which the MS belongs releases the connection between the MS and the PDSN. 15. The method according to claim 1, wherein when the MS sends the application layer message to the BS as a power control message, the BS to which the MS belongs gradually increases the power of the forward shared channel. 16. The method of claim 1, further comprising: If the BS to which the MS belongs fails to receive the power control message sent by any MS within the set time, it will gradually reduce the power of the forward shared channel according to the preset time interval and power step size until it receives the power control message sent by any MS under its jurisdiction. The power signaling message or reduce the power of the forward shared channel to 0. 17. The method according to claim 1, wherein the MS subscribes to the "call waiting" service provided by the network side of the mobile communication system, and the process of receiving the program broadcast by the BS to which the MS belongs also includes processing incoming calls step: When the MS receives the program broadcast by its BS, there is an incoming call. The BS to which the MS belongs stops broadcasting the Program to the MS, and transfers to the incoming call processing or prompts the MS to have an incoming call. The MS decides whether to stop receiving the broadcast Program and transfers to the MS. Incoming call processing. 18. The method according to claim 1, characterized in that, the application layer software supporting BCMCS is stored in the mobile communication system network side, and the process of setting the function of supporting BCMCS at the application layer of MS is: The MS downloads the application layer software supporting BCMCS from the network side of the mobile communication system and runs it, and the setting is completed to support the function of BCMCS.

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