CN102843655B - A kind of method realizing organizing interior wideband multimedia cluster service and transmit in real time - Google Patents

Abstract

The present invention provides a method for real-time transmission of broadband multimedia trunking services within a group, comprising: a service sending user terminal sends a broadband multimedia trunking service request to a multimedia trunking dispatching subsystem; the multimedia trunking dispatching subsystem sends a broadband multimedia trunking service request according to the , authenticate the service sending user terminal, and after passing the authentication, notify the network subsystem to initiate a broadband multimedia trunking service establishment process; the network subsystem initiates an IP-CAN session modification process according to the notification, and executes the clustering on the network subsystem side bearer establishment process, and instruct the broadband wireless access subsystem to allocate uplink wireless resources for service sending user terminals in parallel, and downlink shared wireless resources for service receiving user terminals to complete the establishment process of the cluster bearer; the network subsystem sends the multimedia cluster The dispatching subsystem confirms that the establishment of the broadband multimedia trunking service is completed, and the multimedia trunking dispatching subsystem confirms the establishment of the broadband multimedia trunking service to the service sending user terminal. The invention is suitable for broadband digital trunking communication system.

Description

A method for real-time transmission of intra-group broadband multimedia trunking services

technical field

The invention relates to the field of communication technology, in particular to a method for real-time transmission of intra-group broadband multimedia trunking services in a broadband digital trunking communication system based on Time Division Long Term Evolution (TD-LTE, TimeDivisionDuplex-LongTermEvolution) technology.

Background technique

Due to its unique characteristics of command, dispatch and quick call, the trunking communication system is widely used in public safety, transportation, emergency communication, and enterprise production with high requirements for command and dispatch. At present, the most widely used trunking communication system in the world and domestically is the narrowband digital trunking communication system based on the second-generation mobile communication technology. Terrestrial Trunked Radio (TETRA) system based on TimeDivisionMultipleAccess (TDMA) technology, MOTOROLA's integrated digital enhanced network (IntegratedDigitalEnhancedNetworks, iDEN) system based on TDMA technology, and domestic code division multiple access (CodeDivisionMultipleAccess, CDMA) Technology's open trunking architecture (GlobalopenTrunkingarchitecture, GoTa) system and GSM-based 800MHz digital trunking communication system (GT800) system based on Global System for Mobile communication (GSM) technology. The above digital trunking communication systems have a common feature, mainly based on half-duplex voice communication, and only provide limited low-speed data services.

With the acceleration of social informatization and the vigorous development of broadband wireless communication technology, users in the trunking industry are no longer satisfied with a single half-duplex voice call service, but need broadband that integrates voice, data, image and video. Multimedia trunking service. The broadband multimedia trunking service allows industry personnel to use the trunking communication system to conduct command and dispatch, not only "hear", but also "see", which can meet many special needs of command and dispatch, especially accidents or disasters. In this scenario, the real-time transmission of broadband multimedia trunking services not only helps industry personnel understand the on-site situation intuitively and comprehensively, but also facilitates rescue work.

Due to the limitation of bandwidth and data transmission rate, the existing narrowband digital trunking communication system provides trunking scheduling services only for group voice calls and some supplementary low-speed data services, and cannot perform real-time broadband multimedia trunking services. send.

A method for real-time transmission of intra-group broadband multimedia trunking services suitable for broadband digital trunking communication systems has not been proposed yet.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method for realizing real-time transmission of intra-group broadband multimedia trunking services, which is suitable for broadband digital trunking communication systems.

In order to achieve the above object, the technical scheme proposed by the present invention is:

A method for realizing real-time transmission of broadband multimedia trunking services within a group, the method is applied in a broadband digital trunking communication system, the system includes a terminal and a network side, the terminal includes a user terminal and a dispatcher, the network side includes a network subsystem, a multimedia trunking The scheduling subsystem and the broadband wireless access subsystem are characterized in that the method includes the following steps:

a. The service sending user terminal sends a broadband multimedia trunking service request to the multimedia trunking dispatching subsystem;

b. The multimedia trunking dispatching subsystem authenticates the service sending user terminal according to the broadband multimedia trunking service request, and notifies the network subsystem to initiate a broadband multimedia trunking service establishment process after passing the authentication;

c. The network subsystem initiates the IP-CAN session modification process according to the notification, executes the cluster bearer establishment process on the network subsystem side, instructs the broadband wireless access subsystem to allocate uplink wireless resources for the service sending user terminal in parallel and completes The corresponding cluster bearer establishment process, and at the same time allocate downlink shared wireless resources for service receiving user terminals and complete the corresponding cluster bearer establishment process;

d. The network subsystem confirms to the multimedia trunking dispatching subsystem that the broadband multimedia trunking service is established, and the multimedia trunking dispatching subsystem confirms to the service sending user terminal that the broadband multimedia trunking service is established.

To sum up, in the method for realizing real-time transmission of intra-group broadband multimedia trunking services proposed by the present invention, the network subsystem will also initiate IP-Can sessions during the process of initiating the establishment of broadband multimedia trunking services according to the instructions of the multimedia trunking scheduling subsystem Modify the process so as to generate dynamic PCC rules according to the service type and group subscription information, and initiate the establishment of trunking bearers according to the PCC rules to transmit broadband multimedia service data, so as to meet the bandwidth, rate, delay and requirements of broadband multimedia trunking services. Real-time requirements to ensure real-time transmission of broadband multimedia trunking services. In addition, the method uses parallel processing of signaling messages. The system allocates resources for service sending user terminals and service receiving user terminals in parallel to establish cluster bearer, which greatly shortens the service establishment time and meets the requirements of rapid command and dispatch of the cluster communication system. characteristic. The invention inherits many advantages of TD-LTE, such as high speed and large bandwidth, and is suitable for broadband digital trunking communication systems.

Description of drawings

Fig. 1 is the network architecture schematic diagram of the broadband digital trunking communication system based on TD-LTE technology among the present invention;

Fig. 2 is a schematic flow chart of Embodiment 1 of the present invention;

Fig. 3 is a schematic diagram of a method for real-time transmission of intra-group broadband multimedia trunking services;

Figure 4 shows the IP-Can session modification process initiated by the P-GW.

detailed description

In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

The invention proposes a method for realizing real-time transmission of intra-group broadband multimedia trunking services, and the method is implemented in a TD-LTE-based broadband digital trunking communication system. TD-LTE technology is a model for the integration of mobile communication and broadband wireless access, and it is also one of the mainstream standards for future broadband mobile communication. Compared with the existing trunking communication system, the broadband digital trunking communication system based on TD-LTE technology has larger channel capacity, higher spectrum utilization, stronger anti-interference ability and better transmission performance.

In order to more clearly illustrate the method for real-time transmission of intra-group broadband multimedia trunking services of the present invention, the structure of the broadband digital trunking communication system on which the method is based is firstly described. Figure 1 is a schematic diagram of the network architecture of a broadband digital trunking communication system based on TD-LTE technology. As shown in Figure 1, it includes five main components: terminal, broadband wireless access subsystem, network subsystem, multimedia cluster scheduling subsystem and operation and maintenance subsystem.

1. Terminal

The terminal is connected with the broadband wireless access subsystem or the multimedia trunking dispatching subsystem through an air interface or a wired connection, and provides trunking users with voice trunking services, broadband multimedia trunking services and various dispatching functions. The terminal includes a user terminal and a dispatching station. Further, the user terminal includes a handheld terminal, a vehicle-mounted station, a fixed station, etc., and the dispatching station includes a wired dispatching station and a wireless dispatching station.

2. Broadband wireless access subsystem

The broadband wireless access subsystem consists of base stations (eNodeB). The eNodeB adds a radio trunking dispatch function (RTDF) module on the basis of the original base station of the TD-LTE system, which is responsible for the related processing of the trunking service, including receiving the trunking control signaling from the MME, and allocating radio resources for the terminal (for example, for The service receiving terminals in the group belonging to the same cell allocate downlink shared radio resources), and copy the service data flow received from the S-GW and transmit it to the service receiving terminals through the downlink shared radio resources. In addition, the eNodeB also supports a fault weakening function, which is used to process part of the trunking services of the users within the coverage area of the base station when the eNodeB loses contact with the network subsystem.

3. Network subsystem

The network subsystem mainly consists of Mobility Management Entity (MME), Serving Gateway (S-GW), Packet Data Network Gateway (P-GW), Home Subscriber Server (HSS) and Policy and Charging Rules Functional Entity (PCRF). composition.

MME mainly completes user mobility management, network resource control and other control plane functions, including completing security mechanisms such as authentication and key negotiation between the network and users, mobility management of user terminals, establishment, modification and release of session bearers and other resource management. The S-GW is the end point of the packet data interface connected to the broadband wireless access subsystem, and is mainly responsible for the routing and forwarding of data packets.

P-GW mainly completes the mapping, copying and distribution of service data streams, and initiates the establishment of service bearers according to the service characteristics and QoS requirements requested by users; The business data flows between the clusters.

HSS is a database system responsible for managing users, including user information management, location information management, and user security information management; HSS needs to add a cluster user server to store cluster user information, group user information related to cluster business, and authentication Algorithms and encryption keys, etc., and also provide the basis for cluster user account opening/logout, cluster service authentication/authorization, and billing for network-side devices.

PCRF connects to HSS, P-GW, and MTDS, and requests predefined PCC rules according to the type of service initiated by the user; or provides dynamic QoS policy control decision for MTDS for the specific cluster service of the cluster user, ensuring that it is carried out according to the requirements of the user's contract Mapping and processing of user plane data.

4. Multimedia cluster scheduling subsystem

The multimedia cluster scheduling subsystem is composed of a multimedia cluster scheduling server (MTDS), a recording/video server, an application server and various interconnection gateway devices.

Among them, MTDS is built on the basis of SIPServer and is the control center of trunking service scheduling. It completes the unified session control and resource scheduling of voice scheduling, data scheduling and video scheduling, including establishing, maintaining and releasing various trunking service sessions (such as group call/ Video group call, individual call/visual group call, video surveillance, etc.) for speaking right management and scheduling. In addition, MTDS is also responsible for user management and distribution of business data flow, and provides signaling and data channels between the wired dispatcher and the cluster system. The recording/video server is used to complete the storage and query of voice, data and video in the cluster system. Application servers include various application servers such as voice servers, data servers, video servers, and image intelligent analysis servers, providing cluster users with various industry applications. The interconnection gateway can realize interconnection with PSTN, cellular mobile communication network (such as GSM/TD-SCDMA/LTE, etc.) and other trunking systems (such as TETRA/Gota/GT800, etc.).

5. Operation and maintenance subsystem

The operation and maintenance subsystem provides a maintenance interface for network equipment, collects and monitors network operation information and status, and can generate system operation reports according to the requirements of industry users, providing a basis for network planning and adjustment. According to business division, the operation and maintenance subsystem includes five functional components: safety management, configuration management, fault management, performance management and other management. In order to support the virtual private network function, the operation and maintenance subsystem shall provide user management terminals used by users of the industry group to realize the management function of users in the industry group.

Embodiment 1 of the present invention will be described below in conjunction with the above system structure. Fig. 2 is a schematic flow chart of Embodiment 1 of the present invention, as shown in Fig. 2, this embodiment mainly comprises the following steps:

Step 201, the service sending user terminal sends a broadband multimedia trunking service request to the multimedia trunking dispatching subsystem.

Specifically, in this step, the service sending user terminal determines whether itself is in a connected state, if yes, then directly sends a SIP message to MTDS to request a broadband multimedia trunking service through the default bearer; if not, first initiates a service request (ServiceRequest) process , establish a radio bearer of the default bearer and an S1 bearer, and then send a SIP message to the MTDS to request a broadband multimedia trunking service through the default bearer. The service request process is a standard signaling process of the TD-LTE system, and will not be repeated here.

Step 202: The multimedia trunking dispatching subsystem authenticates the service sending user terminal according to the broadband multimedia trunking service request, and notifies the network subsystem to initiate a broadband multimedia trunking service establishment process after passing the authentication.

After the MTDS receives the broadband multimedia trunking service request from the service sending user terminal, if there is no service sending user terminal cluster subscription information, the MTDS interacts with the HSS to request the service sending user's authentication information and authenticate the service sending user terminal , the content of the authentication includes whether it is authorized to initiate the broadband multimedia trunking service, etc. If the authentication fails, the MTDS rejects the service and sends the service request of the user terminal, and ends the process; if the authentication passes and the dynamic PCC rule is adopted, the MTDS sends the application/service information to the PCRF, and the PCRF saves the application/service information. And return a confirmation message to MTDS.

If MTDS does not have trunk group information, MTDS requests trunk group information from HSS, including group user number list, group priority, multicast address, voice/data/video port number, etc. Subsequently, the MTDS sends a broadband multimedia trunking service establishment instruction message to each MME, and initiates the establishment process of the trunking service.

Step 203, the network subsystem initiates the IP-CAN session modification process according to the notification, executes the cluster bearer establishment process on the network subsystem side, instructs the broadband wireless access subsystem to allocate uplink wireless resources for the service sending user terminal in parallel and Complete the corresponding cluster bearer establishment process, and at the same time allocate downlink shared wireless resources for the service receiving user terminal and complete the corresponding cluster bearer establishment process.

Here, initiating the IP-CAN session modification process and executing the trunking bearer establishment process on the network subsystem side specifically include: after the MME receives the broadband multimedia trunking service establishment instruction sent by the MTDS, it instructs the S-GW to create a trunking bearer, and in the instruction Carry eNodeB list and other information; S-GW forwards the creation cluster bearer instruction to P-GW; P-GW initiates the IP-Can session modification process. During this process, PCRF sends dynamic PCC rules to P-GW. Rules assign bearer-level QoS parameters, and initiate the creation of cluster bearers for transmitting broadband multimedia cluster service data streams; P-GW allocates P-GWS5/S8-TEID, requests S-GW to create cluster bearers, and adds P- The GWS5/S8-TEID is sent to the S-GW; the S-GW allocates the corresponding S-GWS5/S8-TEID and establishes a mapping with the P-GWS5/S8-TEID, and allocates the corresponding S-GWS5/S8-TEID for each eNodeB in the eNodeB list. GWS1-TEID, requests the MME to create a cluster bearer, and sends the S-GWS1-TEID to the MME in the request.

In this step, the MME requests the eNodeB where the service sending user terminal is located to establish a cluster context; after the eNodeB where the service sending user terminal is located allocates uplink wireless resources for the service sending user terminal, it initiates an RRC connection reconfiguration process to the service sending user terminal, and the uplink The radio resource description and related configuration information are sent to the service sending terminal; the service sending user terminal configures its own layer parameters according to the received information, and returns a response message to the eNodeB where it is located to complete the establishment of the radio bearer; at the same time, the service sending user terminal is located The eNodeB allocates downlink shared radio resources for service receiving user terminals belonging to the same cell, and broadcasts trunking paging messages and broadband multimedia trunking service establishment messages in the cells included in it, and notifies service receiving user terminals to establish broadband multimedia trunking services;

The eNodeB where the service sending user terminal is located returns to the MME a cluster context establishment response carrying eNodeBS1-TEID; after receiving the response message sent by the eNodeB where the service sending user terminal is located and the activation cluster bearer context response sent by the service sending user terminal, the MME sends a message to the S -GW returns the cluster bearer creation response, and sends the eNodeBS1-TEID to S-GW; S-GW records the mapping relationship between the eNodeBS1-TEID and S-GWS1-TEID, and sends the previously allocated S-GWS5/S8TEID Send the response message to the P-GW to complete the establishment of the cluster bearer;

After the cluster bearer is established, the MME sends an information prompt to the eNodeB where the service sending user terminal is located; the eNodeB where the service sending user terminal is located broadcasts the information prompt in the cell it contains.

In parallel, the MME instructs other eNodeBs in the eNodeB list except the eNodeB where the service sending user terminal is located to allocate downlink shared radio resources for the service receiving user terminal belonging to the same cell, and broadcast the cluster paging message and A broadband multimedia trunking service establishment message, notifying service receiving user terminals to establish a broadband multimedia trunking service;

In the eNodeB list, other eNodeBs except the eNodeB where the service sending user terminal is located return to the MME the cluster context establishment response carrying the eNodeBS1-TEID; the MME receives the response message from each eNodeB and completes the establishment of the cluster bearer; The eNodeB that returns the acknowledgment message sends the information reminder, notifying the eNodeB to broadcast the information reminder in the cells it includes.

Step 204: The network subsystem confirms to the multimedia trunking dispatching subsystem that the broadband multimedia trunking service is established, and the multimedia trunking dispatching subsystem confirms to the service sending user terminal that the broadband multimedia trunking service is established.

MME notifies MTDS that the broadband multimedia trunking service is established; MTDS sends a SIP message to the service sending user terminal through the default bearer, notifying the service sending user terminal that the broadband multimedia trunking service is successfully established, and at the same time confirms that the service sending user terminal can send broadband multimedia trunking service data flow ; The service sending user terminal sends a SIP message to the MTDS for confirmation.

So far, the broadband multimedia trunking service has been established. Afterwards, you can enter the normal broadband multimedia trunking service sending or receiving process, and the service sending user terminal sends the service flow to the MTDS through the eNodeB, S-GW and P-GW; then, the MTDS maps and copies the service flow, and Distributed to the P-GW and S-GW where the service receiving user terminal is located; the S-GW sends the service flow to each eNodeB in the eNodeB list; finally, each eNodeB broadcasts the broadband service flow to the service receiving user terminal in the cell where it is located Multimedia cluster service data.

The method for realizing the real-time transmission of intra-group broadband multimedia trunking services will be further described in detail by using specific examples in conjunction with FIG. 3 .

FIG. 3 is a schematic diagram of a method for realizing real-time transmission of intra-group broadband multimedia trunking services in a TD-LTE broadband digital trunking communication system according to a method embodiment of the present invention. As shown in FIG. 3 , UE1 is a service sending user terminal, and UE2 is a service receiving user terminal in the group. The specific process of the method includes the following steps:

Steps 1-2, if the service sending user terminal is in the connected state when the broadband multimedia trunking service is initiated, then when the service sending user presses the service sending key, the SIP (INVITE) message is sent to the MTDS directly through the default bearer, requesting to establish Broadband multimedia trunking service; if the service sending user terminal is in an idle state when initiating the broadband multimedia trunking service, then when the service sending user presses the service sending button, it needs to initiate the service request (ServiceRequest) process first, and establish a wireless bearer of the default bearer and S1 bearer, and then the service sending user terminal sends a SIP (INVITE) message to MTDS through the default bearer; the SIP message carries the service sending user number, service sending user priority, group number, emergency identification, service type and other information. The service request process is a standard signaling process of the TD-LTE mobile communication system, and will not be repeated here.

Steps 3-6: After receiving the broadband multimedia trunking service establishment request, the MTDS authenticates the service sending user terminal.

If the MTDS does not have the cluster subscription information of the service sending user terminal, the MTDS interacts with the HSS to request the authentication information of the service sending user, and authenticate the service sending user, including whether it has the right to initiate broadband multimedia trunking services. If the authentication fails, the MTDS returns a SIP (BYE) message with a reason for rejection to the service sending user terminal, and the broadband multimedia trunking service establishment process ends this time; if the authentication passes and the dynamic PCC rule is adopted, the MTDS Send application/service information to PCRF, PCRF saves application/service information, and returns confirmation message to MTDS.

Step 7. If the MTDS has no trunking group information, the MTDS requests the trunking group information from the HSS, including the list of user numbers in the group, group priority, multicast address, voice/data/video port numbers, etc.

Step 8: MTDS sends broadband multimedia trunking service establishment indication message to MME, including service sending user number, group number, multicast address, voice/data/video port number, MTDS user plane address, information indication, etc.

In steps 9-11, the MME instructs the P-GW to initiate the process of creating a cluster bearer.

The MME sends a cluster bearer creation indication message to the S-GW to establish a cluster bearer for the broadband multimedia cluster service, and the message carries eNodeB list, MME control plane TEID and other information; the S-GW forwards the cluster bearer creation indication message to the P-GW ;

If the dynamic PCC rule is adopted, the P-GW will initiate the IP-Can session modification process after receiving the create cluster bearer indication message. For the detailed process, refer to the IP-Can session modification process shown in FIG. 4 . During this process, PCRF generates dynamic PCC rules and sends them to P-GW according to the service type and cluster group information requested by the service sending user terminal; P-GW initiates the process of creating a cluster bearer;

The P-GW sends a cluster bearer creation request message to the S-GW, carrying the P-GWS5/S8-TEID assigned by the P-GW; the S-GW allocates the corresponding For TEID mapping, a corresponding S-GWS1-TEID is assigned to each eNodeB in the eNodeB list, and is sent to the MME by creating a cluster bearer request message.

Steps 12a-18a, the MME instructs the eNodeB where the service sending user terminal is located to allocate uplink radio resources for the service sending user terminal, establish a radio bearer, allocate downlink shared radio resources for the service receiving user terminal belonging to the same cell, and broadcast the trunking paging message and Broadband multimedia trunking service establishment message.

The MME sends a cluster context establishment request message to the eNodeB where the service sending user terminal is located, including an activation cluster bearer context request message and a broadband multimedia cluster service establishment message;

The eNodeB where the service sending user terminal is located sends an RRC connection reconfiguration message to the service sending user terminal to modify the established RRC connection and complete the establishment of the radio bearer. This message includes the uplink radio resource description and other related configuration information; the service sending user terminal After configuring each layer according to the instructions of the eNodeB, an RRC connection reconfiguration complete message will be sent to the eNodeB to confirm that the radio bearer is established;

The eNodeB where the service sending user terminal is located allocates downlink shared radio resources in the cell it contains, broadcasts a trunking paging message and a broadband multimedia trunking service establishment message, and notifies the service receiving user terminal to establish a signaling plane channel and a broadband multimedia trunking service Business channel;

The eNodeB where the service sending user terminal is located sends a cluster context establishment response message to the MME, which contains the eNodeBS1-TEID allocated by the eNodeB;

The service sending user terminal sends an uplink NAS transmission message to the MME through the eNodeB where it is located, including an activation cluster bearer context response message.

Steps 19a-20a, MME sends a create cluster bearer response message to S-GW, the message carries eNodeBS1-TEID; S-GW records the mapping relationship between eNodeBS1-TEID and S-GWS1-TEID, and sends a create cluster bearer response message to P-GW The bearer response message carries the S-GWS5/S8TEID allocated and mapped in step 11, and completes the establishment of the cluster bearer.

Steps 21a-22a, MME sends an information prompt message to the eNodeB where the service sending user terminal is located; the eNodeB where the service sending user terminal is located broadcasts an information prompt in each cell contained in it, and notifies the service receiving user terminal that the service sending terminal has Initiate broadband multimedia trunking services.

Steps 12b-15b, in parallel with step 12a, the MME instructs other eNodeBs in the eNodeB list except the eNodeB where the service sending user terminal is located to allocate downlink shared radio resources, and broadcast a trunking paging message and a broadband multimedia trunking service establishment message.

The MME sends a cluster context establishment request message to other eNodeBs in the eNodeB list, including a broadband multimedia cluster service establishment message, instructing each eNodeB to allocate downlink shared radio resources in the cells it contains, and the message carries the group number, group priority, S-GWS1-TEID, multicast address and other parameters;

After the eNodeB completes the allocation of downlink shared radio resources, it will broadcast a trunking paging message and a broadband multimedia trunking service establishment message in each cell it contains, and notify the service receiving user terminal to establish the signaling plane channel and service plane of the broadband multimedia trunking service aisle;

Each eNodeB where the service receiving user terminal is located returns a cluster context establishment response message to the MME, and the message includes the eNodeBS1-TEID allocated by each eNodeB.

Steps 16b-17b, MME sends a create cluster bearer response message to S-GW, and the message carries eNodeBS1-TEID; S-GW records the mapping relationship between eNodeBS1-TEID and S-GWS1-TEID, and sends a create cluster bearer message to P-GW The bearer response message carries the S-GWS5/S8TEID allocated and mapped in step 11, and completes the establishment of the cluster bearer.

Steps 18b-19b: After the MME receives the cluster context establishment response message sent by the eNodeBs in the eNodeB list except the eNodeB where the service receiving user terminal is located, and completes the establishment of the cluster bearer, the MME then instructs these eNodeBs to be in the cells it contains The information prompt message is broadcast to notify the service receiving user terminal to initiate the broadband multimedia trunking service for the service sending terminal at this time.

Step 23: The MME sends a broadband multimedia trunking service establishment confirmation message to the MTDS, notifying the MTDS that the broadband multimedia trunking service is established.

Steps 24～25, MTDS sends SIP (200OK) message to service sending user terminal by default bearer, informs service sending user terminal that the broadband multimedia trunking service is set up successfully, determines that service sending user terminal can send broadband multimedia trunking service data flow simultaneously; The sending user terminal sends a SIP (ACK) message to the MTDS for confirmation.

After the broadband multimedia trunking service is established, the users in the group enter the state of sending or receiving the broadband multimedia trunking service. The uplink data is sent to the MTDS through the eNodeB, S-GW, and P-GW where the service sending user terminal is located, and the MTDS replicates and distributes the data flow, and sends it to the eNodeB list through the P-GW and S-GW where the service receiving user terminal is located Each eNodeB broadcasts broadband multimedia trunking service data to service receiving user terminals in the cell where the eNodeB is located.

For trunking paging messages and broadband multimedia trunking service establishment messages, the periodic broadcast method is adopted. For users in the group who are not powered on or not in the dispatching area, when they are powered on or enter the dispatching area, they will be added to the group by late entry. In the ongoing broadband multimedia trunking business.

Fig. 4 is a schematic diagram of the IP-Can session modification process initiated by the P-GW in the embodiment of the present invention. As shown in Figure 4, it specifically includes the following steps:

Step 1. The P-GW sends an IP-Can session modification instruction message to the PCRF to request the required PCC rules;

Steps 2-3, if the PCRF does not have the application/service information of the session, the PCRF requests the application/service related information of the service session from the MTDS;

Steps 4-5, if the PCRF does not have the cluster group information, then the PCRF requests the cluster group information from the HSS;

Step 6, PCRF formulates dynamic PCC rules according to application/service information and cluster group information;

Step 7. The PCRF sends a confirmation IP-Can session modification message to the P-GW, carrying the PCC rule;

Step 8: The P-GW returns a policy confirmation message to the PCRF.

As can be seen from the above technical solutions, the TD-LTE broadband digital trunking communication system described in the present invention adopts the new generation of broadband mobile communication technology TD-LTE, inherits many advantages such as TD-LTE high speed and large bandwidth, and is different from existing digital Compared with the trunking communication system, it has larger channel capacity, higher spectrum utilization, stronger anti-interference ability and better transmission performance.

In the method for realizing the real-time transmission of broadband multimedia trunking services in the group according to the present invention, the network subsystem initiates the process of establishing broadband multimedia trunking services according to the instructions of the multimedia trunking scheduling subsystem, and also initiates the IP-Can session modification process, according to The subscription information of service type and group generates dynamic PCC rules, and initiates the establishment of cluster bearer according to PCC rules to transmit broadband multimedia service data, so as to meet the bandwidth, rate, delay and real-time requirements of broadband multimedia trunking services. Guarantee the real-time transmission of broadband multimedia trunking services.

In addition, the above method adopts the method of parallel processing of signaling messages. The system allocates resources for service sending user terminals and service receiving user terminals in parallel, and establishes cluster bearer, which greatly shortens the service establishment time and meets the needs of rapid command and dispatch of the cluster communication system. characteristics.

To sum up, the above are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (11)

1. the method realizing organizing interior wideband multimedia cluster service and transmit in real time, the method is applied in wideband digital trunked communication system, this system comprises terminal and network side, terminal comprises user terminal and dispatching desk, network side comprises network subsystem, multimedia cluster scheduler subsystem and broadband wireless access subsystem, it is characterized in that, the method comprises the following steps:

A, business send user terminal and send wideband multimedia cluster service request to described multimedia cluster scheduler subsystem;

B, described multimedia cluster scheduler subsystem, according to described wideband multimedia cluster service request, send subscriber terminal authority to described business, and after authentication is passed through, informing network subsystem initiates wideband multimedia cluster service process of establishing;

C, described network subsystem initiate IP-Can session modification process according to described notice, perform the cluster loading establishing process of network subsystem side, instruction broadband wireless access subsystem: distribute ascending wireless resource for business sends user terminal and complete corresponding cluster loading establishing process, and share Radio Resource for business receives user terminal allocation of downlink and complete corresponding cluster loading establishing process simultaneously;

To described multimedia cluster scheduler subsystem, d, described network subsystem confirm that wideband multimedia cluster service has been set up, multimedia cluster scheduler subsystem sends user terminal to business and confirms that wideband multimedia cluster service has been set up;

Wherein, described step b comprises,

Multimedia cluster dispatch server MTDS in multimedia cluster scheduler subsystem is according to described wideband multimedia cluster service request, subscriber terminal authority is sent to described business, the content of described authentication comprises whether having permission initiation wideband multimedia cluster service, if described authentication is not passed through, then described MTDS refuses the service request that business sends user terminal, process ends; If described authentication is passed through, then described MTDS sends wideband multimedia cluster service to the relevant MME in described network subsystem and sets up instruction, initiates described wideband multimedia cluster service process of establishing;

Network subsystem described in step c initiates IP-Can session modification process according to described notice, performs the cluster loading establishing process of network subsystem side, comprises,

Described MME indicates to gateway S-GW and creates cluster carrying, and in described instruction, carry eNodeB list, MME chain of command TEID information; Described S-GW forwards to PDN Gateway P-GW and creates cluster carrying instruction;

Described P-GW initiates described IP-Can session modification process after receiving described establishment cluster carrying instruction, request dynamic PCC rule, and according to described dynamic PCC regular allocation carrying level qos parameter, initiates to create cluster load bearing process; Described P-GW distributes P-GWS5/S8-TEID, asks described S-GW to create cluster carrying, and in the request described P-GWS5/S8-TEID is sent to described S-GW; Described S-GW distributes corresponding S-GWS5/S8-TEID and sets up the mapping with described P-GWS5/S8-TEID, corresponding S-GWS1-TEID is distributed for each eNodeB in eNodeB list, ask described MME to create cluster carrying, and in the request described S-GWS1-TEID is sent to described MME.

2. method according to claim 1, is characterized in that, described step a comprises,

Business sends user terminal and determines whether self is in connection status, if so, then directly session initiation protocol sip message request wideband multimedia cluster service is sent by default bearer to the multimedia cluster dispatch server MTDS in multimedia cluster scheduler subsystem; If not, then initiate service request ServiceRequest process, set up radio bearer and the S1 carrying of default bearer, send sip message request wideband multimedia cluster service by default bearer to MTDS.

3. method according to claim 1, it is characterized in that, before MTDS described in step b sends wideband multimedia cluster service foundation instruction to each MME, if have employed dynamic strategy and charging control PCC rule, then described MTDS sends application/business information to the strategy in described network subsystem and charging rule functions PCRF, described PCRF, after the described application/business information of preservation, returns acknowledge message to described MTDS.

4. method according to claim 1, it is characterized in that, before MTDS described in step b sends wideband multimedia cluster service foundation instruction to each MME, if described MTDS does not collect group information, then ask cluster group user profile to the HSS in described network subsystem, described cluster group user profile comprises group priority, the list of group Subscriber Number, multicast address, voice/data/video port numbers.

5. method according to claim 1, is characterized in that, described P-GW initiates IP-Can session modification process, and request dynamic PCC rule, comprises,

Described P-GW sends the instruction of IP-Can session modification to described PCRF; If PCRF does not have application/business information and the collection group information of this session, then described PCRF asks the application/service related information of this service conversation to described MTDS; If do not collect group information, then to HSS request collection group information; PCRF formulates dynamic PCC rule according to the application/business information obtained and collection group information, confirms IP-Can session modification to P-GW; Described P-GW is to PCRF sending strategy confirmation.

6. method according to claim 1, is characterized in that, comprises described in step c for business sends user terminal distribution ascending wireless resource and completes corresponding cluster loading establishing process:

Cluster context is set up in the eNodeB request that MME in network subsystem sends user terminal place to business, comprises the request of request and the wideband multimedia cluster service foundation activating cluster bearer context in described request;

The eNodeB that described business sends user terminal place is after described business sends user terminal distribution ascending wireless resource, send user terminal to business and initiate radio resource control RRC connection reconfiguration process, the description of described ascending wireless resource and relevant configuration information are sent to described business and send user terminal;

Described business sends user terminal according to each layer parameter of the information configuration received self, and returns response message to the eNodeB at place, and sends by the eNodeB at place the response activating cluster bearer context to MME;

The eNodeB that described business sends user terminal place is that the business reception user terminal allocation of downlink belonging to same community shares Radio Resource, and in the community that it comprises, broadcast clustered paging message and wideband multimedia cluster service sets up message, informing business receives signaling plane passage and the user face passage that user terminal sets up wideband multimedia cluster service;

The eNodeB that described business sends user terminal place returns the cluster context foundation response of carrying eNodeBS1-TEID to MME;

Described MME receives business and sends the eNodeB at user terminal place and business and send the acknowledge message that user terminal returns, and after having confirmed the foundation that cluster carry, the eNodeB transmission information sending user terminal place to business is pointed out;

Described business sends eNodeB broadcast message prompting in the community that it comprises at user terminal place, and informing business receiving terminal now business transmitting terminal initiates wideband multimedia cluster service.

7. method according to claim 1, is characterized in that, shares Radio Resource and complete corresponding cluster loading establishing process to comprise described in step c for business reception user terminal allocation of downlink:

Ascending wireless resource is distributed concurrently for business sends user terminal with described in step c, MME indicates other eNodeB request in eNodeB list except the eNodeB that business sends user terminal place to set up cluster context, request comprises wideband multimedia cluster service and sets up request, Radio Resource is shared for the business belonging to same community receives user terminal allocation of downlink, and in the community that it comprises, broadcast clustered paging message and wideband multimedia cluster service sets up message, informing business receives signaling plane passage and the user face passage that user terminal sets up wideband multimedia cluster service,

Other eNodeB in eNodeB list except the eNodeB that business sends user terminal place returns to MME the cluster context carrying eNodeBS1-TEID and sets up response; MME receives the response message from each eNodeB, completes the foundation of cluster carrying;

MME receives the acknowledge message that other eNodeB in eNodeB list except the eNodeB that business sends user terminal place returns, and confirm the foundation having completed cluster carrying, then MME sends information prompting to the eNodeB returning acknowledge message, notify this eNodeB broadcast message prompting in the community that it comprises, informing business receiving terminal now business transmitting terminal initiates wideband multimedia cluster service.

8. the method according to claim 6 or 7, is characterized in that, the foundation that described MME completes cluster carrying comprises:

MME in network subsystem receives after the cluster context carrying eNodeBS1-TEID that each eNodeB in eNodeB list sends sets up response, returns and creates cluster carrying response, and described eNodeBS1-TEID is sent to S-GW to S-GW; S-GW records the mapping relations of described eNodeBS1-TEID and S-GWS1-TEID, and described S-GWS5/S8TEID is sent to P-GW by response message, completes the foundation of cluster carrying.

9. method according to claim 1, is characterized in that, described steps d comprises,

MME in network subsystem notifies that the MTDS wideband multimedia cluster service in multimedia cluster scheduler subsystem has been set up;

Described MTDS sends user terminal by default bearer to described business and sends sip message, notify that described business sends user terminal wideband multimedia cluster service and is successfully established, determine that described business sends user terminal and can send wideband multimedia cluster service data flow simultaneously;

Described business sends user terminal and confirms to MTDS transmission sip message.

10. the either method according to claim 1 to 7,9, is characterized in that, the scheduler subsystem of multimedia cluster described in steps d sends user terminal to business and confirms that wideband multimedia cluster service comprises after having set up,

Described business sends user terminal by eNodeB, S-GW and P-GW, and Business Stream is sent to MTDS;

Business Stream carries out mapping and copying by described MTDS, and is distributed to P-GW, S-GW that business receives user terminal place;

Business Stream is sent to each eNodeB in eNodeB list by described S-GW;

Described each eNodeB receives user terminal broadcast broadband multimedia cluster business datum to business in the community that it comprises.

11. methods according to claim 8, is characterized in that, the scheduler subsystem of multimedia cluster described in steps d sends user terminal to business and confirms that wideband multimedia cluster service comprises after having set up,

Described business sends user terminal by eNodeB, S-GW and P-GW, and Business Stream is sent to MTDS;

Business Stream carries out mapping and copying by described MTDS, and is distributed to P-GW, S-GW that business receives user terminal place;

Business Stream is sent to each eNodeB in eNodeB list by described S-GW;

Described each eNodeB receives user terminal broadcast broadband multimedia cluster business datum to business in the community that it comprises.