CN102300168B - A kind of method and system realizing trunking communication - Google Patents

Abstract

The invention discloses a method and system for realizing cluster communication. When a terminal initiates a cluster call, a base station selects a unicast or multicast mode for communication according to a communication mode selection strategy. In particular, when the load of the base station is light (the current load result is lower than the preset threshold value), the unicast communication method is selected; and when the base station load is heavy (the current load result exceeds the preset threshold value), the multicast communication method is selected . The invention combines the two communication modes of unicast and multicast well, so that the respective advantages of the two are fully reflected in the cluster system. Through the method of the invention, the communication quality is guaranteed to the greatest extent, and the system resource is saved in the case of high system load, and the system capacity is improved, thereby improving the service quality and ensuring user experience.

Description

A method and system for realizing cluster communication

technical field

The invention relates to cluster communication technology, in particular to a method and system for realizing cluster communication.

Background technique

The trunking communication system is a dedicated wireless communication system for specific industry applications developed to meet the command needs of industry users. In the trunking communication system, a large number of wireless users share a small number of wireless channels, and the main application is command and dispatch. It is a multi-purpose and high-efficiency wireless communication system. The trunking communication system has a wide range of application markets in government departments, public safety, emergency communication, electric power, civil aviation, petrochemical and military.

Unicast is point-to-point communication, and multicast is point-to-multipoint communication. Unicast communication has good user experience in terms of service quality and timely response.

At present, the multicast mode is adopted in the cluster communication, and system resources are saved by adopting a dedicated shared channel. However, since all trunking terminals share the same channel, data transmission will inevitably be interfered. When the load on the network side is heavy, this interference will become more serious, thereby affecting the call quality and reducing the service quality.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method and system for realizing cluster communication. On the premise of saving resources, the call quality can be guaranteed, thereby improving the service quality.

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

A method for implementing cluster communication, comprising:

The base station pre-sets the communication mode selection strategy;

When a terminal initiates a cluster call, the cluster base station selects a unicast or multicast mode for communication according to a communication mode selection strategy.

The communication mode selection strategy is set according to the situation of the base station.

The communication mode selection strategy is: when the base station load exceeds a preset threshold, the communication mode is multicast; when the base station load is lower than the preset threshold, the communication mode is unicast.

According to the communication mode selection strategy, selecting unicast or multicast mode for communication includes:

The base station inquires about the load situation, and if the current load result is lower than the preset threshold, the terminal in the trunking call chooses to use unicast communication for communication in this call service; if the current load result exceeds the preset threshold, then The terminal in the trunking call chooses to use a multicast communication mode for communication in this call service;

The cluster base station periodically sends cluster paging in the cell, and the paging message carries a communication mode flag indicating whether it is a unicast mode or a multicast mode;

According to the selected communication mode, the base station allocates resources for the call service of the terminal in the trunking call and then performs communication.

The selected communication mode is a unicast communication mode; the allocation of resources for the call service of the terminal according to the selected communication mode includes:

The terminals that receive the cluster paging establish connections with the base station and the core network respectively, and the base stations respectively establish instances for their respective terminals; the core network forwards the received uplink cluster data to the established instances, and then each instance Send to the corresponding called terminal for communication.

The selected communication mode is a multicast communication mode; the allocation of resources for the call service of the terminal according to the selected communication mode includes:

The cluster base station establishes a cluster instance for the cluster terminal, and the core network sends the received uplink cluster data to the established cluster instance, and then the cluster instance sends the data to the cluster terminal for communication.

The preset threshold is a load value, or a load percentage value, or the number of users that can be accommodated by the network side.

A system for realizing cluster communication, including at least a base station, and multiple terminals participating in cluster communication, wherein,

The base station is provided with a communication mode selection strategy; it is used to receive a group call initiated by the terminal side, and select a unicast or multicast mode for communication according to the communication mode selection strategy;

Terminals, including a calling terminal and a called terminal group composed of at least one terminal, are used to initiate a group call, and the calling terminal and the called terminal group communicate according to the unicast or multicast mode selected by the base station.

The communication mode selection strategy is: when the base station load exceeds a preset threshold, the communication mode is multicast communication; when the base station load is lower than the preset threshold, the communication mode is unicast communication.

The base station is specifically used for:

The base station receives a cluster call initiated by the terminal side, queries the load situation, and determines that the terminal in the cluster call chooses to use unicast communication for communication in this call service when the current load result is lower than a preset threshold; When the current load result exceeds the preset threshold, it is determined that the terminal in the cluster call chooses to use the multicast communication mode for communication in this call service;

The cluster base station periodically sends cluster paging in the cell, and the paging message carries a communication mode flag indicating whether it is a unicast mode or a multicast mode;

According to the selected communication mode, the base station allocates resources for the call service of the terminal in the trunking call and then performs communication.

The system also includes a core network;

The selected communication mode is a unicast communication mode;

The terminal receiving the cluster paging is specifically used to respectively establish a connection with the base station and the core network to which it belongs,

The base station is further configured to respectively establish instances for respective terminals;

The core network is used to forward the received uplink cluster data to each built instance after receiving the uplink cluster data, and then each instance sends it to the corresponding called terminal respectively.

The selected communication mode is a multicast communication mode;

The cluster base station is also used to establish a cluster instance for the cluster terminal;

The core network is used to receive uplink cluster data, forward the received uplink cluster data to the established cluster instance, and then the cluster instance sends the data to the cluster terminal.

It can be seen from the above technical solution provided by the present invention that when a terminal initiates a group call, the base station selects a unicast or multicast mode for communication according to a communication mode selection policy. In particular, when the load of the base station is light (the current load result is lower than the preset threshold value), the unicast communication method is selected; and when the base station load is heavy (the current load result exceeds the preset threshold value), the multicast communication method is selected . The invention combines the two communication modes of unicast and multicast well, so that the respective advantages of the two are fully reflected in the cluster system. Through the method of the invention, the communication quality is guaranteed to the greatest extent, and the system resources are saved in the case of high system load, and the system capacity is improved, thereby improving the service quality and ensuring user experience.

Description of drawings

Fig. 1 is the flow chart of the method for realizing group communication of the present invention;

FIG. 2 is a schematic diagram of the composition and structure of the system for realizing cluster communication in the present invention;

FIG. 3 is a flow chart of the first embodiment of the method for realizing cluster communication in the present invention;

Fig. 4 is a flow chart of the second embodiment of the method for implementing cluster communication in the present invention.

Detailed ways

Fig. 1 is the flow chart of the method for realizing group communication of the present invention, as shown in Fig. 1, comprises:

Step 100: The base station presets a communication mode selection policy.

In this step, the communication mode selection strategy is set according to the situation of the base station, for example, when setting according to the load situation of the base station, the communication mode selection strategy is: when the load level of the base station exceeds a certain preset threshold, the communication mode is a multicast mode, and when the load level When it is lower than a certain preset threshold, the communication mode is unicast mode.

Wherein, the preset threshold may be a load value, or a load percentage value, or the number of users that can be accommodated by the network side, and the like.

Step 101: When a terminal initiates a cluster call, the cluster base station selects a unicast or multicast mode for communication according to a communication mode selection strategy. Here, the base station to which each trunk terminal in the trunk group call belongs is also referred to as a trunk base station.

The specific implementation of this step roughly includes:

First, when a terminal initiates a trunking call, it will establish a connection with the base station and the core network. When the core network receives the initial UE context message and finds that the current call is a trunking call, it will trigger trunking paging and initiate a trunking paging to the trunking base station. call. The specific implementation belongs to the prior art, and its implementation method is not used to limit the protection scope of the present invention.

Next, after the cluster base station receives the cluster paging, assuming that the cluster base station selects a strategy according to the communication mode set by the load condition, then the cluster base station queries the load condition, and if the current load result is lower than the preset threshold, the terminal in the cluster call is in the This call service chooses to use the unicast communication method for communication; if the current load result exceeds the preset threshold, the terminal in the trunking call chooses to use the multicast communication method for this call service; the trunking base station receives the trunking paging Immediately after that, a cluster instance is established, and cluster paging is periodically sent in the cell, and the paging message carries a communication mode flag indicating whether it is a unicast mode or a multicast mode.

Finally, the base station performs communication after allocating resources for the calling service of the terminal in the cluster call according to the selected communication mode: if the communication mode flag is displayed as a multicast mode, after the core network receives the uplink cluster data, the uplink cluster The data is forwarded to the cluster instance of all the cluster base stations (that is, the cluster instance established immediately after the cluster base station receives the cluster paging), and then the cluster instance sends the data to the cluster terminal (each called terminal participating in the cluster communication); if the communication method The preparation is shown as unicast mode. The terminals that receive the cluster paging establish connections with the base station and the core network respectively, and the base stations respectively establish instances for their respective terminals. After the core network receives the uplink cluster data, it forwards the uplink cluster data to each base station as The instances created by the called terminals under its jurisdiction are sent to the corresponding called terminals respectively by these instances.

It can be seen from the method of the present invention that when the load of the base station is light (the result of the current load is lower than the preset threshold), the unicast communication mode is adopted; and when the load of the base station is heavy (the result of the current load exceeds the preset threshold), the multicast communication is adopted Way. Through the method of the invention, the communication quality is guaranteed to the greatest extent, and the system resources are saved in the case of high system load, and the system capacity is improved, thereby improving the service quality and ensuring user experience.

For the method of the present invention, a system for realizing cluster communication is also provided, as shown in FIG. 2 , at least including a base station and multiple terminals, wherein,

The base station is provided with a communication mode selection policy; it is used to receive a trunking call initiated by a terminal, and select a unicast or multicast mode for communication according to the communication mode selection policy. Here, the base station to which each cluster terminal in the cluster group belongs is also referred to as a cluster base station.

Terminals, including a calling terminal and a called terminal group composed of at least one terminal, are used to initiate a group call, and the calling terminal and the called terminal group communicate according to the unicast or multicast mode selected by the base station.

The method of the present invention will be described in detail below in conjunction with the examples. In the following embodiments, it is assumed that the communication mode selection strategy is: when the load level exceeds a preset threshold, the communication mode is multicast communication; when the load level of the base station is lower than the preset threshold, the communication mode is unicast communication.

Fig. 3 is the flow chart of the first embodiment of the method for realizing trunking communication of the present invention, in the first embodiment, it is assumed that terminal 1 initiates a trunking call, and terminal 2 is a called terminal in the trunking group; each base station sets the load Threshold, when the load of the base station is lower than the load threshold, it is called light load, and when the load of the base station exceeds the load threshold, it is called heavy load. Here, the base station to which each cluster terminal in the cluster group belongs is also referred to as a cluster base station. As shown in Figure 3, the following steps are included:

Step 300: Terminal 1 initiates a group call, and Terminal 1 sends a random access request message to the base station.

Step 301: the base station replies with a random access response, and the random access response carries uplink resources allocated to the terminal 1 .

Step 302: Terminal 1 sends a radio link control (RRC) establishment request message on the uplink resource allocated to it.

Step 303: the base station returns an RRC establishment message to terminal 1.

Step 304: After receiving the RRC establishment message, the terminal 1 sends an RRC establishment completion message to the base station. The RRC establishment completion message carries a non-access stratum message, and the non-access stratum message includes cluster number information.

Step 305: the base station receives the RRC establishment complete message, and sends an initial UE (UE) context message to the core network.

Step 306: The core network receives the initial UE context message, finds that the current call is a trunking call, establishes a trunking call instance, triggers trunking paging, and transmits a trunking bearer establishment request message to the trunking base station, and at the same time sends a request message to the base station that initiated the initial UE context message Send back the UE context establishment request message.

Step 307: the base station receives the UE context establishment request message, and sends an RRC reconfiguration message to terminal 1 .

Step 308: Terminal 1 receives the RRC reconfiguration message, and sends an RRC reconfiguration response message.

Step 309: the base station receives the RRC reconfiguration response message, and sends an initial UE context establishment request response message to the core network.

Steps 310 to 312: The cluster base station receives the cluster paging and inquires about its own load. Assuming that the load is heavy at this time, it chooses to use multicast communication; The paging message carries a communication mode flag indicating that the multicast mode is adopted.

Steps 313 to 314: the cluster base station receives a cluster bearer establishment request message from the core network, establishes a cluster instance, and sends a cluster bearer establishment response message to the core network.

Steps 315 to 317: The core network receives the uplink cluster data, forwards the uplink cluster data to the cluster instance established by the cluster base station, and then the cluster instance sends the data to the terminal 2 . The terminal 1 and the terminal 2 communicate through multicast communication.

Wherein, steps 307-309, steps 310-312, and steps 313-314 are performed in no strict order.

Fig. 4 is the flow chart of the second embodiment of the method for realizing trunking communication of the present invention, in the second embodiment, it is assumed that terminal 1 initiates a trunking call, and terminal 2 is a called terminal in the trunking group; each base station sets the load Threshold, when the load of the base station is lower than the load threshold, it is called light load, and when the load of the base station exceeds the load threshold, it is called heavy load. Here, the base station to which each cluster terminal in the cluster group belongs is also referred to as a cluster base station. As shown in Figure 4, the following steps are included:

Step 400: the terminal initiates a cluster call, and terminal 1 sends a random access request message to the base station.

Step 401: The base station replies with a random access response, and the random access response carries uplink resources allocated to the terminal 1 .

Step 402: Terminal 1 sends an RRC establishment request message on the allocated uplink resource.

Step 403: the base station returns an RRC setup message to terminal 1.

Step 404: After receiving the RRC establishment message, the terminal 1 sends an RRC establishment completion message to the base station, the RRC establishment completion message carries a non-access stratum message, and the non-access stratum message includes cluster number information.

Step 405: the base station receives the RRC establishment complete message, and sends an initial UE context message to the core network.

Step 406: The core network receives the initial UE context message, finds that the current call is a trunking call, establishes a trunking call instance, triggers trunking paging, transmits a trunking bearer establishment request message to the trunking base station, and at the same time, sends a request message to the base station that initiated the initial UE context message Send an initial UE context establishment request message.

Step 407: the base station receives the initial UE context establishment request message, and sends an RRC reconfiguration message to terminal 1 .

Step 408: Terminal 1 receives the RRC reconfiguration message, and returns an RRC reconfiguration response message to the base station.

Step 409: the base station receives the RRC reconfiguration response message, and sends an initial UE context establishment request response message to the core network.

Steps 410 to 412: The trunking base station receives the trunking paging and inquires about its own load. Assuming that the load is relatively light at this time, it chooses to use unicast communication, and at the same time periodically sends trunking paging in the cell, and the paging message carries Indicates the communication mode flag that adopts unicast mode.

Steps 413 to 414: the cluster base station receives a cluster bearer establishment request message from the core network, establishes a cluster instance, and returns a cluster bearer establishment response message to the core network.

Step 415-Step 425: After receiving the paging carrying the communication mode flag indicating that the unicast mode is adopted, the terminal 2 sends a random access request message to the base station; then,

The base station replies with a random access response, which carries the uplink resource allocated to terminal 2, and terminal 2 sends an RRC establishment request message on the allocated uplink resource; the base station returns an RRC establishment message to terminal 2; terminal 2 receives After the RRC establishment message, send an RRC establishment completion message to the base station, the base station receives the RRC establishment completion message, and sends an initial UE context message to the core network; after the core network receives the initial UE context message, it sends an initial UE context establishment request message to the base station, Create an instance for terminal 2; the base station sends an RRC reconfiguration message to terminal 2 after receiving the initial UE context establishment request message; terminal 2 receives the RRC reconfiguration message and returns an RRC reconfiguration response message; the base station receives the RRC reconfiguration response message , returning a UE context establishment request response message to the core network.

Steps 426 to 428: The core network receives the uplink cluster data, forwards the uplink cluster data to the instance built for the terminal 2 by the base station to which the terminal 2 belongs, and then sends it to the called terminal 2 by the instance.

Wherein, the execution of steps 407-409, steps 410-412, and steps 413-414 is not in strict order.

The above description is only a preferred embodiment of the present invention, and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the within the protection scope of the present invention.

Claims (7)

1. A method for realizing cluster communication, comprising: The cluster base station pre-sets the communication mode selection strategy; When the terminal initiates a cluster call, the cluster base station selects the unicast or multicast mode for communication according to the communication mode selection strategy; the terminal communicates in the selected mode; The communication mode selection strategy is: when the cluster base station load exceeds a preset threshold, the communication mode is a multicast mode, and when the cluster base station load is lower than a preset threshold value, the communication mode is a unicast mode; According to the communication mode selection strategy, selecting unicast or multicast mode for communication includes: The cluster base station queries the load situation, and if the current load result is lower than the preset threshold, the terminal in the cluster call chooses to use unicast communication for communication in this call service; if the current load result exceeds the preset threshold, Then the terminal in the group call chooses to use the multicast communication mode to communicate in this call service; The cluster base station periodically sends cluster paging in the cell, and the paging message carries a communication mode flag indicating whether it is a unicast mode or a multicast mode; The cluster base station allocates resources for the calling service of the terminal in the cluster call according to the selected communication mode, and then performs communication. 2. The method according to claim 1, wherein the selected communication mode is a unicast communication mode; and according to the selected communication mode, allocating resources for the call service of the terminal comprises: The terminals that receive the cluster paging establish connections with the cluster base station and the core network respectively, and the cluster base stations respectively establish instances for their respective terminals; the core network forwards the received uplink cluster data to the established instances respectively, and each instance separately Send to the corresponding called terminal for communication. 3. The method according to claim 1, wherein the selected communication mode is a multicast communication mode; and according to the selected communication mode, allocating resources for the call service of the terminal comprises: The cluster base station establishes a cluster instance for the cluster terminal, and the core network sends the received uplink cluster data to the established cluster instance, and then the cluster instance sends the data to the cluster terminal for communication. 4. The method according to any one of claims 1-3, wherein the preset threshold is a load value, or a load percentage value, or the number of users that can be accommodated by the network side. 5. A system for realizing trunking communication, characterized in that it includes at least a trunking base station, and a plurality of terminals participating in trunking communication, wherein, The trunking base station is provided with a communication mode selection strategy; it is used to receive a trunking call initiated by the terminal side, and select a unicast or multicast mode for communication according to the communication mode selection strategy; A terminal, including a calling terminal and a called terminal group composed of at least one terminal, is used to initiate a cluster call, and the calling terminal and the called terminal group communicate according to the unicast or multicast mode selected by the cluster base station; The communication mode selection strategy is: when the cluster base station load exceeds a preset threshold, the communication mode is a multicast mode, and when the cluster base station load is lower than a preset threshold value, the communication mode is a unicast mode; The cluster base station is specifically used for: The trunking base station receives the trunking call initiated by the terminal side, queries the load situation, and when the current load result is lower than the preset threshold, it is determined that the terminal in the trunking call chooses to use unicast communication mode for communication in this call service ; When the current load result exceeds the preset threshold, it is determined that the terminal in the cluster call chooses to use the multicast communication mode for communication in this call service; The cluster base station periodically sends cluster paging in the cell, and the paging message carries a communication mode flag indicating whether it is a unicast mode or a multicast mode; The cluster base station allocates resources for the calling service of the terminal in the cluster call according to the selected communication mode, and then performs communication. 6. The system according to claim 5, further comprising a core network; The selected communication mode is a unicast communication mode; The terminal receiving the cluster paging is specifically used to establish a connection with the cluster base station and the core network to which it belongs, The cluster base station is also used to respectively establish instances for respective terminals; The core network is used to forward the received uplink cluster data to each built instance after receiving the uplink cluster data, and then each instance sends it to the corresponding called terminal respectively. 7. The system according to claim 6, wherein the selected communication mode is a multicast communication mode; The cluster base station is also used to establish a cluster instance for the cluster terminal; The core network is used to receive uplink cluster data, forward the received uplink cluster data to the established cluster instance, and then the cluster instance sends the data to the cluster terminal.