WO2006053503A1 - Method for realizing cluster srevice - Google Patents

Abstract

A method for realizing cluster service is disclosed. The key of the method is in that: setting the function plane function of PTT server in BCMCS controller, and setting the BCMCS CS provided with subscriber plane function of PTT server as PSG. The clustered forward voice is transmitted on BCMCS channel in multi-broadcast manner, and the backward voice is transmitted on reverse service channel in single-broadcast manner. The clustered calling signaling and floor control signaling are transmitted in single-broadcast manner. PSG only receives the voice from current speaker, encrypts the voice, and transmits the encrypted voice to the listener by forward channel, therefore, only the member of the group can decipher and receive the voice. According to present invention, by combing single-broadcast service and multi-broadcast service, BCMCS can provide cluster service, therefore realizing the co-operation of cluster service and normal service. Moreover, the present do not need any modification of air protocol and A interface protocol, and can be realized by only updating the software of client and server, therefore having good compatibility and expansibility.

Description

 A method for realizing cluster business

Technical field

 The present invention relates to the field of mobile communication technologies, and in particular, to a method for implementing a cluster service. Background of the invention

 The trunking communication system is an important branch of the mobile communication system. A very important feature of trunking communication is to use PTT (Push to Talk) to implement calls. PTT is a push-to-talk voice service, that is, the calling party quickly establishes communication with the called party by pressing and holding the function key. Link, implement the call. The called party can be either an individual or a group i.

 When a user finishes speaking and releases the right to speak, the members in the group compete for the right to speak. The PTT server (PTT Server) schedules the speaking rights according to a certain algorithm. The user who obtains the speaking right can speak, and other members in the group can only answer.

 Each of the relevant cells has a broadcast channel at the time of the call, and the current talker uses the uplink service channel, that is, the group transmission mode, and all listeners use the broadcast channel, that is, the group reception mode. The group call channel configured notification message is broadcast on the control channel (CCH). Users in the same cell share a downlink channel.

 As the third-generation mobile communication technology standard, cdma2000 has very efficient spectrum utilization efficiency, and the broadcast multicast service (BCMCS) further improves the utilization of the air channel. The schematic diagram of the BCMCS system is shown in Figure 1:

BCMCS Provider 101: Is the content source or creator. Broadcast Multicast Service Controller (BCMCS Controller) 102: responsible for managing BCMCS session information, and giving BCMCS Service Node (BSN) 104, base station controller/packet control function for multicast (Multicast BSC/PCF) 106, access The terminal (AT) 109 and the content server (CS, Content Server) 103 provide BCMCS session information. And receiving Authorization verification information from the Authentication, Authorization, and Accounting Server (AAA Server), completion of Broadcast Access Key (BAK) distribution, or completion of BAK generation. At the same time, the BCMCS Controller can also perform operations such as finding the desired stream, authenticating the BCMCS content provider, and coordinating the transmission of the BCMCS content.

 BCMCS Content Server 103: It is not necessarily a content source or creator, it is the last application-level entity responsible for managing the content stream, such as reformatting. It also stores and forwards content streams, merges content streams from multiple providers, and completes application-level encryption.

 BSN 104: A logical entity supporting BCMCS, which may be the same physical entity as the Packet Data Serving Node (PDSN) 105. The logical entity cooperates with the Multicast BSC/PCF 106 to add and delete multicast IP flows, and uses the IP multicast protocol to manage bearer paths, such as joining a multicast group, exiting a multicast group, and the like, and performing multicast IP stream processing specified by the BCMCS Controller. , such as header compression and deletion.

 The PDSN 105 receives the information from the network through the unicast connection and transmits the received information to the base station controller/packet control function (Unicast BSC/PCF) 107 for unicast.

 A Base Transceiver Station (BTS) 108 transmits the received information from the Unicast BSC/PCF 107 and the Multicast BSC/PCF 106 to the AT 109.

 Although Unicast BSC/PCF 106 and Multicast BSC/PCF 107 are mentioned in Figure 1, BSC/PCF generally supports both unicast and broadcast, and there is no need to mention Unicast BSC/PCF or Multicast BSC/PCF. Moreover, Unicast BSC/PCF 106, Multicast BSC/PCF 107 and BTS 108 in Figure 1 are equivalent to one access network.

Although BCMCS has very efficient air channel utilization efficiency, it is not suitable for cluster services. This is because the BCMCS service is only a one-way service from the network to the user, and the cluster service is a pre-emptive mode of half-duplex communication, that is, one member in the group speaks, and other members are in the receiving state. How to use the BCMCS service to provide cluster services, realize the common network operation of cluster services and common services, and make better use of BCMCS's very efficient channel. The use of this feature is a problem to be solved. Summary of the invention

 In view of this, an object of the present invention is to provide a method for implementing a cluster service, which utilizes

The BCMCS service provides cluster services to implement cluster network services and common services for common network operations.

 In order to achieve the above object, the technical solution of the present invention is achieved as follows:

 A method for implementing a cluster service, setting a control plane function of a PTT server in a broadcast multicast service controller BCMCS Controller, and setting a BCMCS content server with a user plane function of the PTT server as a PTT service gateway PSG, and accessing A point-to-point PPP connection has been established between the terminal and the packet data serving node PDSN. The method further includes the following steps:

 a. A BCMCS bearer channel is established between the access terminal that initiates the cluster group call and the logical entity BSN that supports the BCMCS, and information for receiving the forward voice is obtained from the access network AN/PCF;

 b. The BCMCS controller invites the access terminal in the group to initiate the group call to join the group call, and notifies the PSG of the service information required for the group call;

 c. The PSG receives the voice information on the reverse channel through the unicast connection according to the service information in step b, and applies the broadcast channel to send the forward voice information.

 Preferably, if the access terminal is in the dormant state, the method further includes: activating a unicast connection and establishing a dedicated group call channel while establishing a BCMCS bearer channel between the access terminal and the BSN; or, in the BCMCS bearer After the channel is established, when the access terminal is ready to send information, it activates the unicast connection and establishes a dedicated group call channel.

 Preferably, the process of establishing a BCMCS bearer channel between the access terminal and the BSN in step a includes the following steps:

Al, the access terminal sends a BCMCS registration request message to the AN/PCF, if AN/PCF The bearer channel of the BCMCS flow is not established between the BSN and the BSN, and the AN/PCF sends a BCMCS flow registration request message to the BSN to establish a BCMCS bearer channel. After the BCMCS bearer channel is established, the AN/PCF returns the established response information of the bearer channel. Then step a2 is performed, if the bearer channel of the BCMCS stream is established between the AN/PCF and the BSN, step a2 is directly performed;

 A2. The access network sends the BCMCS bearer channel established information to the access terminal.

 Preferably, the access terminal sends a BCMCS registration request message through the air interface common channel or the established dedicated service channel; the AN/PCF sends a BCMCS stream registration request message to the BSN through the A interface.

 Preferably, the method further includes: before the step b is performed, the access terminal that initiates the cluster group call acquires the BCMCS flow information of the current group call from the BCMCS controller through a unicast connection, and monitors the service flow; or While the access terminal sends the BCMCS registration request message, the BCMCS flow information of the current group call is obtained from the BCMCS controller through the unicast connection, and the service flow is monitored.

 Preferably, the BCMCS flow information of the current group call includes: a multicast IP address, a port number, a broadcast access key BAK, an expiration date of the key BAK, and whether to use a header compression letter.

 Preferably, the process in which the BCMCS controller invites the access terminal in the group to join the group call, and notifies the PSG of the group call, is:

After the BCMCS controller invites all the access terminals except the group call to join the group call, it notifies the PSG of the service information required by the group call, or the BCMCS controller notifies the PSG of the group call. After the service information, all the access terminals in the group except the initiating group call are added to the group call, or the BCMCS controller invites some access terminals in the group other than the group call to join the group call, and then notifys PSG calls the required business information for this group.

Preferably, the service information required for the group call in step b includes: a unicast IP address, Multicast IP address, port number, broadcast access key BAK, expiration date of the key BAK, whether to use header compression information.

 Preferably, in step c, the voice information on the reverse channel is received by unicast, and the method for transmitting the forward voice information by using the broadcast channel is:

 The PSG only receives the voice information of the notified unicast IP address, and encrypts the voice information by using the broadcast access key, and then sends the encrypted voice information to the corresponding multicast IP address and port number through the broadcast channel.

 Preferably, in the trunking call state, the method further includes the following steps: d. An access terminal sends a preemption request to the BCMCS controller through a unicast connection; e. After the BCMCS controller agrees with the request in step d, the method is notified. The PSG updates the unicast IP address of the current speaker, and sends a response message of the consent request to the access terminal that sends the request through the forward unicast connection, and simultaneously informs the group in addition to the request to initiate the request through the forward unicast connection. Enter the current speaker of the terminal;

 c. The PSG receives the voice information on the reverse channel through the unicast connection, and applies the broadcast channel to send the forward voice information.

 Preferably, the forward voice information for receiving in step a includes information indicating whether the BCMCS stream corresponding to the cluster group call is available, and information of the broadcast logical channel and the physical channel used by the BCMCS stream when available.

 Preferably, the PDSN and the BSN are located in the same physical entity, or the PDSN and the BSN are located in different physical entities.

The invention sets the control plane function of the PTT server in the BCMCS Controller, sets the user plane function of the PTT server in the BCMCS Content Server, and sets the BCMCS content server with the user plane function of the PTT server as the PTT service gateway (before the PSG X cluster) The voice is sent using multicast on the BCMCS channel, and the reverse voice is sent on the reverse traffic channel using a unicast connection. Cluster Call Signaling and Preemption (Floor) Control signaling is sent using a unicast connection. The PSG only receives the voice from the current speaker, that is, the unicast IP address is used as the identifier, and the voice information from other IP addresses is discarded. In order to prevent non-group members from receiving, the PSG encrypts the forward voice data so that only members of the group can decrypt and receive. By applying the present invention, the unicast service is combined with the multicast service, and the BCMCS Controller is appropriately extended, so that the BCMCS service can provide the cluster service, and realize the common network operation of the cluster service and the common service. Moreover, by applying the present invention, no modification is made to the air interface protocol and the A interface protocol, and only the software of the client and the server end can be extended, and the compatibility and the scalability are good. BRIEF DESCRIPTION OF THE DRAWINGS

 Figure 1 shows the structure of the BCMCS system;

 2 is a schematic structural diagram of a group call when a cluster system is applied to the present invention; FIG. 3 is a schematic diagram of a flow for implementing a cluster group call according to an embodiment of the present invention; FIG. 3 is a schematic diagram of a process for implementing cluster preemption in the embodiment shown in FIG. 3. Mode for carrying out the invention

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

The BCMCS service is divided into static broadcast and dynamic broadcast. The static broadcast establishes the BCMCS bearer channel through operation and maintenance. The channel always exists regardless of whether the user listens to the BCMCS stream. Dynamic broadcast dynamically establishes and releases BCMCS-bearing channels based on user monitoring. A flow has only one bearer channel, and the IP network protocol is used for transmission on the core network side. The BSN completes the mapping of the multicast IP address and the port number to the flow ID. The present invention applies dynamic broadcasting. The idea of the present invention is as shown in FIG. 2: setting the control plane function of the PTT server in the BCMCS Controller, setting the user plane function of the PTT server in the BCMCS Content Server, and setting the BCMCS content server with the user plane function of the PTT server as PTT Service Gateway (PSG). The dotted line in the figure represents the cluster forward voice traffic, the dotted line represents the cluster reverse voice traffic, and the solid line represents the established communication connection. The cluster forward voice is sent by using multicast on the BCMCS channel, that is, the PSG sends the received voice information to the corresponding multicast IP address and port number in the cluster group via the BSN and the access network (AN/PCF). The multicast IP address and port number are the corresponding access terminals in the group; the reverse voice is transmitted on the reverse traffic channel using unicast, that is, the voice information sent by the speaker's AT is unicast through the AN/PCF. And the PDSN arrives at the PSG. The cluster call signaling and preemption control signaling are sent using a unicast connection. The AAA server is used to perform authorization verification on the terminal.

 The PSG only receives the voice from the current speaker, that is, the unicast IP address is used as the identifier, and the voice information from other IP addresses is discarded. In order to prevent non-group members from receiving, P S G encrypts the forward voice data so that only members of the group can decrypt and receive it.

 The following is specifically described in conjunction with the flowchart.

 FIG. 3 is a schematic flowchart of implementing a cluster group call according to an embodiment of the present invention. In this embodiment, it is assumed that AT1, AT2, and AT3 are members of the same cluster group, and are in the same sector, where ATI is the talker, the rest are the listeners, and all access terminals, that is, AT1, AT2 and AT3 have established a point-to-point (PPP) connection between the AN/PCF and the PDSN, and the logical functional entity BSN and the PDSN are in the same physical entity. The control plane function of the PTT server has been set in the BCMCS Controller.

Step 301: The ATI sends through an air interface common channel or an established dedicated service channel. The BCMCS registration request message is sent to the AN/PCF. If the bearer channel of the BCMCS stream is not established between the AN/PCF and the BSN, step 302 is performed. If the bearer channel of the BCMCS stream is established between the AN/PCF and the BSN, step 304 is directly performed.

 Step 302: The AN/PCF sends a BCMCS flow registration request to the BSN through the A interface to establish a BCMCS bearer channel.

 Step 303: After the BSN joins the multicast group, the entire bearer channel is established, and the AN/PCF returns the response information that the bearer channel has established.

 Step 304: The AN/PCF sends the ATI the information that the BCMCS bearer channel has been established. Step 305: The AN/PCF sends a broadcast multicast overhead message (BCMCS Overhead), indicating whether the BCMCS flow corresponding to the cluster group call is available, and indicating a broadcast logical channel and a physical channel allocated to the access terminal application when available, ie The AT air port is informed whether the BCMCS stream exists, and if so, what is the broadcast logical channel and the physical channel used by the BCMCS stream, that is, information for receiving the forward voice is sent to the AT. At this point, ATI begins monitoring the corresponding broadcast channel and is ready to receive.

 Step 306: If the ATI is in a dormant state, the unicast connection is activated, and a dedicated group call channel is established. This step may also be performed at the same time as step 301, that is, after the BCMCS bearer channel is established, when the access terminal is ready to send information. , activate the unicast connection, and establish a dedicated group call channel.

Step 307: The ATI obtains the BCMCS flow information from the BCMCS Controller having the control plane function of the PTT server through the unicast connection, so as to monitor the service flow, and set the ID of the BCMCS flow to the cluster group. ID. This step may also be performed in step 301, that is, the ATI sends the BCMCS registration request message from the BCMCS controller through the unicast connection, and monitors the service flow itself. The above BCMCS flow information includes the multicast IP address, port number, BAK, BAK expiration time (BAK Expiry time), whether to use the head pressure Retract information.

 At the same time, the BCMCS Controller with the control plane function of the PTT server also obtains the information requested by ATI through the BCMCS flow information from ATI to determine what ATI wants to do. In this example, the BCMCS Controller determines that the ATI request initiates a group call according to the obtained request information, and then performs step 308a.

 Steps 308a, 309a, the BCMCS Controller with the control plane function of the PTT server invites users in the group to join the group call, that is, invites AT2 and AT3 to join the group call respectively.

 After receiving the invitation, steps 308b, 309b, AT2 and AT3 respectively obtain BCMCS flow information from the BCMCS Controller through the unicast connection, and are used to correctly receive the forward multicast stream.

 Step 310: The BCMCS Controller having the control plane function of the PTT server sends service information to the PSG, where the service information includes a unicast IP address, a multicast IP address, a port number, a BAK, a BAK expiry time, and whether Use information such as header compression. The PSG only receives voice information from the notified unicast IP address, and voice information from other IP addresses is discarded. Depending on the operator's different policies, this step can also be performed before the user is invited to join, that is, before step 308, or the step can be performed after one user joins.

 Step 311: The ATI sends reverse voice information to the PSG through a unicast connection.

 Step 312: The PSG encrypts the received voice information by using the BAK, and sends the forward encrypted voice information to the multicast IP address and the port number through the broadcast channel, where the multicast IP address and the port number are the corresponding access terminals in the group. , ie AT2 and AT3.

 For the above embodiment, if ATI, AT2, and AT3 are not in the same sector, AT1, AT2, and AT3 respectively send a request BCMCS flow registration message to establish a BCMCS bearer channel. The above BSN and PDSN may also not be in the same physical entity.

FIG. 4 shows a flow of cluster preemption based on the embodiment shown in FIG. 3 to which the present invention is applied. Schematic diagram. In this embodiment, the group call member is in a call state. Among them, AT2 is the user who initiated the preemption.

 Step 401: AT2 sends a preemption (Floor) message to the BCMCS Controller having the control plane function of the PTT server on the unicast connection.

 Step 402: After the BCMCS Controller agrees to the preemption of the AT2, the service information is sent to the PSG. Because the preemption is initiated by other access terminals in the same group, the service information sent to the PSG only needs to update the unicast IP of the current speaker. address.

 Step 403: The BCMCS Controller sends a preemptive response (floor Grant) message to the AT2 on the forward unicast connection.

 Steps 404a, 404b, the BCMCS Controller sends a Presence Acquisition (floor Taken) message to the ATI and AT3 on the forward unicast connection to notify the current speaker of other users in the group.

 Step 405: AT2 sends reverse voice information to the PSG through a unicast connection.

 Step 406a, step 406b, the PSG encrypts the received voice information by using the BAK, and sends the forward encrypted voice information to the ATI and the AT3 through the broadcast channel.

 So far, BCMCS is used to implement the cluster service. The air interface protocol is still used between the AT and the AN. The air interface protocol does not need to be modified.

 In the present invention, the cluster call signaling and the preemption control signaling are transmitted using a unicast connection. Since the forward traffic channel of the system is time division multiplexed, in the case of no data transmission, the forward unicast connection is Does not occupy resources. The reverse unicast connection is used to transmit the voice information of the speaker. Since only one user talks at the same time, that is, only one reverse traffic channel is transmitted, so the impact on the system reverse load is small, so that more cluster users can be supported. .

The invention is applicable to both CDMA 2000 IX systems and CDMA 2000 1XEV-DO (Data Only) systems. The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modifications, equivalents, improvements, etc., which are included in the scope of the present invention, should be included in the scope of the present invention. within.

Claims

Claim  A method for implementing a cluster service, characterized in that a control plane function of a PTT server is set in a broadcast multicast service controller BCMCS Controller, and a BCMCS content server with a user plane function of a PTT server is set as a PTT service. A gateway PSG, and a point-to-point PPP connection is established between the access terminal and the packet data serving node PDSN. The method further includes the following steps:  a. A BCMCS bearer channel is established between the access terminal that initiates the cluster group call and the logical entity BSN that supports the BCMCS, and information for receiving the forward voice is obtained from the access network AN/PCF;  b. The BCMCS controller invites the access terminal in the group to initiate the group call to join the group call, and notifies the PSG of the service information required for the group call;  c. The PSG receives the voice information on the reverse channel through the unicast connection according to the service information in step b, and applies the broadcast channel to send the forward voice information.  The method according to claim 1, wherein if the access terminal is in a dormant state, the method further comprises: activating a unicast connection and establishing a BCMCS bearer channel between the access terminal and the BSN A dedicated group call channel; or, after the BCMCS bearer channel is established, when the access terminal is ready to send information, 'activate the unicast connection and establish a dedicated group call channel.  The method according to claim 1, wherein the step of establishing a BCMCS bearer channel between the access terminal and the BSN comprises the following steps: The access terminal sends a BCMCS registration request message to the AN/PCF. If the bearer channel of the BCMCS flow is not established between the AN/PCF and the BSN, the AN/PCF sends a BCMCS flow registration request message to the BSN to establish a BCMCS bearer channel, BCMCS. After the bearer channel is established, return the response information that the bearer channel has been established to the AN/PCF, and then perform the steps. A2, if the bearer channel of the BCMCS flow has been established between the AN/PCF and the BSN, step a2 is directly performed;  A2. The access network sends the BCMCS bearer channel established information to the access terminal.  The method according to claim 3, wherein the access terminal sends a BCMCS registration request message through an air interface common channel or an established dedicated service channel; the AN/PCF sends the BCM to the BSN through the A interface. BCMCS stream registration request message.  The method according to claim 3, wherein the method further comprises: before the step b is performed, the access terminal that initiates the cluster group call obtains the BCMCS of the group call from the BCMCS controller through a unicast connection. The flow information is used to monitor the service flow; or, when the access terminal sends the BCMCS registration request message, the BCMCS flow information of the current group call is obtained from the BCMCS controller through the unicast connection, and the service flow is monitored.  The method according to claim 5, wherein the BCMCS flow information of the current group call includes: a multicast IP address, a port number, a broadcast access key BAK, an expiration date of the key BAK, whether Use header compression information.  The method according to claim 1, wherein the BCMCS controller in step b invites an access terminal in the group other than the initiating group call to join the group call, and notifies the PSG of the group call required. The process of business information is:  After the BCMCS controller invites all the access terminals except the group call to join the group call, it notifies the PSG of the service information required by the group call, or the BCMCS controller notifies the PSG of the group call. After the service information, all the access terminals in the group except the initiating group call are added to the group call, or the BCMCS controller invites some access terminals except the group call to join the group call. PSG calls the required business information for this group. The method according to claim 1 or 7, wherein the service information required for the group call in step b includes: a unicast IP address, a multicast IP address, a port number, and a broadcast access key BAK. , the expiration date of the key BAK, whether to use the header compression information. The method according to claim 8, wherein the step c receives the voice information on the reverse channel by using unicast, and the method for transmitting the forward voice information by using the broadcast channel is:  The PSG only receives the voice information of the notified unicast IP address, and encrypts the voice information by using the broadcast access key, and then sends the encrypted voice information to the corresponding multicast IP address and port number through the broadcast channel.  The method according to claim 9, wherein in the trunking call state, the method further comprises the following steps:  d. An access terminal sends a preemption request to the BCMCS controller through the unicast connection; e. After agreeing to the request in step d, the BCMCS controller notifies the PSG to update the unicast IP address of the current speaker, and passes the forward unicast The connection sends a response message to the access terminal that sends the request, and at the same time, notifies the current speaker of the access terminal in the group that is the requesting request through the forward unicast connection;  c. The PSG receives the voice information on the reverse channel through the unicast connection, and applies the broadcast channel to send the forward voice information.  The method according to claim 1, wherein the forward voice information for receiving in step a includes information indicating whether a BCMCS stream corresponding to the cluster group call is available, and the BCMCS stream is available when available. The information used to broadcast logical ramps and physical channels.  The method according to claim 1, wherein the PDSN and the BSN are located in the same physical entity, or the PDSN and the BSN are located in different physical entities.