CN109874114B - Method for establishing session in advance for cluster system based on MCPTT - Google Patents
Method for establishing session in advance for cluster system based on MCPTT Download PDFInfo
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Abstract
The invention belongs to the technical field of trunking communication, and relates to a method for establishing a session in advance by a trunking system based on MCPTT, which comprises the following steps: a cluster system session management method for storing session information between a terminal and a cluster system; interacting the terminal and the cluster system and terminal interacting method of the signaling between the cluster systems; an interactive method of MCPTT participating server and media forwarding server applying and releasing system resources; a call establishment and hang-up method for establishing and hanging up single call and group call; and the speaking right control method controls speaking right application, speaking right release, speaking right queuing and speaking right preemption. The invention efficiently and flexibly realizes the MCPTT cluster system services such as session establishment and release, system resource application and release, group call establishment and hang-up, single call establishment and hang-up, speaking right control and the like of the MCPTT cluster system pre-established session. Compared with the session establishment method on demand of the cluster system, the cluster service response time based on the session establishment method in advance is shorter.
Description
Technical Field
The invention belongs to the technical field of trunking communication, and particularly relates to a method for establishing a session in advance in a trunking system based on MCPTT.
Background
The digital trunking communication system is a professional commanding and dispatching system and is mainly applied to departments such as governments, public security, traffic, military and the like.
The foreign narrowband Digital trunking communication standards include TETRA (Terrestrial Trunked Radio), DMR (Digital Mobile Radio), IDEN (integrated Digital Enhanced network); the domestic narrow-band Digital Trunking communication standards include PDT (policy Digital Trunking standard), GoTa (Global open Trunking architecture) based on CDMA technology, and GT800 based on GSM technology.
At present, a domestic and foreign broadband digital cluster system is in a starting stage. In 2012, 11 months, the national communication standardization institute started the formulation of the LTE-based broadband trunking system (B-TrunC) series of standards. The 3GPP standards organization promulgated the LTE network-based "Push-To-Talk over Mission" (MCPTT), which was defined as part of the ETSI-TS-124-379 standard (release 13), on 2016.
In the ETSI-TS-124 and 379 standards, the MCPTT protocol specifies that a session is established in advance. Compared with the session establishment method on demand of the cluster system, the cluster service response time based on the session establishment method in advance is shorter. Therefore, the MCPTT-based cluster system pre-establishment session method is very important.
The invention analyzes the stipulation of the MCPTT cluster system for establishing the session in advance in the ETSI-TS-124-379 standard (version 13) based on the existing Internet cloud platform, designs a method for establishing the session in advance for the cluster system based on the MCPTT by combining the specific requirements of industrial users, realizes the cluster service for establishing the session in advance based on the MCPTT, and provides reference for the development of the digital cluster exchange system based on the MCPTT.
Disclosure of Invention
In order to realize cluster service based on MCPTT pre-established session, the invention designs a cluster system pre-established session method based on MCPTT, and the specific technical scheme is as follows:
a method for establishing session in advance based on cluster system of MCPTT (MCPTT cluster system for short) applies the cluster system based on MCPTT, the cluster system based on MCPTT includes: the system comprises an MCPTT participation server, an MCPTT control server and a media forwarding server; the MCPTT participation server is communicated with the MCPTT terminal; the media forwarding server communicates with the media forwarding server through the MCPTT control server;
the cluster system pre-session establishment method based on the MCPTT comprises the following steps: a cluster system session management method, an interaction method between a cluster system and an MCPTT terminal, an interaction method between an MCPTT participating server and a media forwarding server, a call establishment and hang-up method and a speaking right control method;
the cluster system session management method is used for: storing the session information between the MCPTT terminal and the MCPTT-based cluster system;
the interaction method of the cluster system and the MCPTT terminal is used for: establishing and releasing a pre-established session of the MCPTT-based cluster system, and interacting signaling of the pre-established session between the MCPTT terminal and the MCPTT-based cluster system;
the method for interacting the cluster system with the MCPTT terminal comprises the following steps: a method for establishing a session in advance and a method for releasing the session in advance;
the method for establishing the pre-established session is used for: establishing a session between the MCPTT trunking system and the MCPTT terminal;
the release method of the pre-established session is used for: releasing the session between the MCPTT trunking system and the MCPTT terminal;
the method for the interaction between the MCPTT participation server and the media forwarding server is used for: applying for and releasing system resources of a pre-established session;
the method for the interaction between the MCPTT participation server and the media forwarding server comprises the following steps: a system resource acquisition method, a system resource release method, a method for pre-establishing a session and call binding, and a method for pre-establishing a session and call unbinding;
the system resource acquisition method comprises the following steps: the MCPTT participating server acquires system resources from the media forwarding server;
the system resource release method comprises the following steps: the MCPTT participating server informs the media forwarding server to release system resources;
the method for pre-establishing the session and the call binding comprises the following steps: the media forwarding server establishes the binding of system resources and the call;
the method for pre-establishing the session and unbinding the call comprises the following steps: the media forwarding server releases the binding of the system resource and the call;
the call setup and hangup method is used for: establishing and hanging up single calls and group calls based on pre-established sessions;
the call establishment and hanging-up method comprises the following steps: a single call establishing method, a single call hanging-up method, a group call establishing method and a group call hanging-up method;
the single call establishing method comprises the following steps: the MCPTT trunking system establishes a single call based on a pre-established session;
the single call hanging-up method comprises the following steps: the MCPTT cluster system hangs up the single call based on the pre-established session;
the group call establishing method comprises the following steps: the MCPTT trunking system establishes a group call based on a pre-established session;
the group calling hang-up method comprises the following steps: the MCPTT cluster system hangs up the group calling based on the pre-established session;
the speaking right control method is used for: controlling the application of the speaking right, the release of the speaking right, the queuing of the speaking right and the preemption of the speaking right based on the pre-established conversation.
On the basis of the technical scheme, before the establishment method of the pre-established session is applied, the MCPTT terminal is accessed.
On the basis of the technical scheme, the access of the MCPTT terminal comprises the following steps:
1) after receiving a TCP long connection request sent by an MCPTT terminal, the MCPTT cluster system stores socket information parameters of the TCP long connection;
2) after receiving an access request sent by an MCPTT terminal, the MCPTT trunking system updates session information of the MCPTT terminal and sends a 200OK signaling to the MCPTT terminal;
3) the MCPTT trunking system starts a link monitoring timer to monitor the connection state of the MCPTT terminal and waits for other control signaling sent by the MCPTT terminal;
4) the MCPTT cluster system enters a blocking state and waits for access of other MCPTT terminals.
On the basis of the technical scheme, the method for establishing the pre-established session comprises the following steps:
1) the MCPTT participating server receives a request for establishing a pre-established session sent by the MCPTT terminal;
2) the MCPTT participating server sends a sessionReq signaling, applies for system resources of a pre-established session to the media forwarding server, and waits for the reply of the media forwarding server;
3) after receiving the reply of the media forwarding server, the MCPTT participating server saves the system resources acquired from the media forwarding server;
4) the MCPTT participation server sends a 200OK signaling to inform the MCPTT terminal that the session is established successfully in advance.
On the basis of the technical scheme, the system resource acquisition method comprises the following steps:
1) a media forwarding server receives a system resource application request sent by an MCPTT participating server;
2) the media forwarding server establishes a state machine for pre-establishing a session state indication;
3) the media forwarding server allocates a system port for the pre-established session;
4) the media forwarding server informs the MCPTT participation server of successful allocation of system resources.
On the basis of the technical scheme, the group call establishing method comprises the following steps:
1) the MCPTT trunking system receives an SIP-REFER signaling sent by the MCPTT terminal;
2) the MCPTT trunking system establishes a state machine for indicating the call state;
3) the MCPTT participation server sends a SessionBind signaling to inform the media forwarding server to bind system resources and call;
4) the MCPTT participation server sends a CONNECT signaling to inform the MCPTT terminal that the group calling is successfully established.
On the basis of the above technical solution, the speaking right application in the speaking right control method comprises the following steps:
1) the MCPTT trunking system receives a FloorRequest signaling sent by the MCPTT terminal;
2) the MCPTT cluster system judges whether to grant the MCPTT terminal speaking right by using a speaking right control method;
3) the MCPTT trunking system sends FloorGranted signaling to the MCPTT terminal applying for the speaking right;
4) the MCPTT trunking system sends FloorTaken signaling to other MCPTT terminals participating in the call.
On the basis of the technical scheme, the MCPTT based cluster system is built on a cloud platform, and the MCPTT terminal is connected with the cloud platform and is accessed to the MCPTT cluster system.
On the basis of the technical scheme, the MCPTT terminal is connected with the cloud platform through a public mobile communication network.
On the basis of the above technical solution, the public mobile communication network includes: 3G and 4G.
The invention has the following beneficial technical effects:
the method of the invention can efficiently and flexibly realize the MCPTT cluster system services of pre-established conversation establishment and release, system resource application and release, group call establishment and hang-up, single call establishment and hang-up, speaking right control and the like of the MCPTT cluster system. Compared with the session establishment method on demand of the cluster system, the cluster service response time based on the session establishment method in advance is shorter.
Drawings
The invention has the following drawings:
fig. 1 is a schematic diagram of an access process of an MCPTT terminal according to the present invention.
Fig. 2 is a flow chart illustrating a method for establishing a pre-established session according to the present invention.
Fig. 3 is a schematic flow chart of a system resource acquisition method according to the present invention.
Fig. 4 is a flow chart of a group call establishing method of the present invention.
FIG. 5 is a flow chart illustrating the right-to-speak application according to the present invention.
Detailed Description
The present invention is described below by way of examples, it should be noted that the examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and those skilled in the art can make some insubstantial modifications and adaptations in light of the above disclosure. The embodiments and features of the embodiments of the invention may be combined with each other without conflict.
A cluster system pre-establishment session method based on MCPTT comprises a cluster system session management method, an interaction method of a cluster system and an MCPTT terminal, an interaction method of an MCPTT participation server and a media forwarding server, a call establishment and hang-up method and a speaking right control method.
In the embodiment, an MCPTT cluster system is built on a cloud platform, and an MCPTT terminal is connected with the cloud platform through public mobile communication networks such as 3G or 4G and the like and is accessed to the MCPTT cluster system.
The cluster system session management method is used for: storing the conversation information between the MCPTT terminal and the MCPTT trunking system;
in the specific implementation process, the MCPTT trunking system stores parameters of sockets accessed to the MCPTT terminals, parameters of pre-established conversation system resources and parameters based on pre-established conversation calls by utilizing a trunking system conversation management method. Fig. 1 is a schematic diagram of an access process of an MCPTT terminal. As shown in fig. 1, the MCPTT terminal access procedure includes the following steps:
1) after receiving a TCP long connection request sent by an MCPTT terminal, the MCPTT cluster system stores parameters such as socket information of TCP long connection;
2) after receiving an access request sent by an MCPTT terminal, the MCPTT trunking system updates session information of the MCPTT terminal and sends a 200OK signaling to the MCPTT terminal;
3) the MCPTT trunking system starts a link monitoring timer to monitor the connection state of the MCPTT terminal and waits for other control signaling sent by the MCPTT terminal;
4) the MCPTT cluster system enters a blocking state and waits for access of other MCPTT terminals.
The interaction method of the cluster system and the MCPTT terminal is used for: and establishing and releasing a pre-established session of the MCPTT cluster system. Fig. 2 is a flow chart of a method for establishing a pre-established session. As shown in fig. 2, the method for establishing the pre-established session includes the following steps:
1) the MCPTT participating server receives a request for establishing a pre-established session sent by the MCPTT terminal;
2) the MCPTT participating server sends a sessionReq signaling, applies for system resources of a pre-established session to the media forwarding server, and waits for the reply of the media forwarding server;
3) after receiving the reply of the media forwarding server, the MCPTT participating server saves the system resources acquired from the media forwarding server;
4) the MCPTT participation server sends a 200OK signaling to inform the MCPTT terminal that the session is established successfully in advance.
The method for the interaction between the MCPTT participation server and the media forwarding server is used for: apply for and release system resources of the pre-established session.
In the implementation, the MCPTT participating server obtains system resources for forwarding the media message from the media forwarding server. Fig. 3 is a schematic flow chart of a system resource acquisition method. As shown in fig. 3, the system resource obtaining method includes the following steps:
1) a media forwarding server receives a system resource application request sent by an MCPTT participating server;
2) the media forwarding server establishes a state machine for pre-establishing a session state indication;
3) the media forwarding server allocates a system port for the pre-established session;
4) the media forwarding server informs the MCPTT participation server of successful allocation of system resources.
The call setup and hangup method is used for: single and group calls based on pre-established sessions are established and hung up.
In the implementation process, the MCPTT-based cluster system can complete the call establishment and hanging-up service based on the pre-established session. Fig. 4 is a flow chart of a group call establishing method. As shown in fig. 4, the group call setup method includes the following steps:
1) the MCPTT trunking system receives an SIP-REFER signaling sent by the MCPTT terminal;
2) the MCPTT trunking system establishes a state machine for indicating the call state;
3) the MCPTT participation server sends a SessionBind signaling to inform the media forwarding server to bind system resources and call;
4) the MCPTT participation server sends a CONNECT signaling to inform the MCPTT terminal that the group calling is successfully established.
The speaking right control method is used for: controlling the application of the speaking right, the release of the speaking right, the queuing of the speaking right and the preemption of the speaking right based on the pre-established conversation.
In the specific implementation process, the MCPTT-based cluster system utilizes the speaking right control method to control speaking right application, speaking right release, speaking right queuing and speaking right preemption based on the pre-established conversation. Fig. 5 is a flow chart of the speaking right application. As shown in fig. 5, the speaking right application flow includes the following steps:
1) the MCPTT trunking system receives a FloorRequest signaling sent by the MCPTT terminal;
2) the MCPTT cluster system judges whether to grant the MCPTT terminal speaking right by using a speaking right control method;
3) the MCPTT trunking system sends FloorGranted signaling to the MCPTT terminal applying for the speaking right;
4) the MCPTT trunking system sends FloorTaken signaling to other MCPTT terminals participating in the call.
Finally, it should be noted that: the above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structures or flow transformations made by the present specification and drawings, or applied directly or indirectly to other related arts, are included in the scope of the present invention.
Those not described in detail in this specification are within the knowledge of those skilled in the art.
Claims (6)
1. A method for pre-establishing session of cluster system based on key task push-to-talk (MCPTT), which applies the MCPTT-based cluster system, the MCPTT-based cluster system comprises: the system comprises an MCPTT participation server, an MCPTT control server and a media forwarding server; the MCPTT participation server is communicated with the MCPTT terminal; the method is characterized in that:
the cluster system pre-session establishment method based on the MCPTT comprises the following steps: a cluster system session management method, an interaction method between a cluster system and an MCPTT terminal, an interaction method between an MCPTT participating server and a media forwarding server, a call establishment and hang-up method and a speaking right control method;
the cluster system session management method is used for: storing the session information between the MCPTT terminal and the MCPTT-based cluster system;
the interaction method of the cluster system and the MCPTT terminal is used for: establishing and releasing a pre-established session of the MCPTT-based cluster system, and interacting signaling of the pre-established session between the MCPTT terminal and the MCPTT-based cluster system;
the method for interacting the cluster system with the MCPTT terminal comprises the following steps: a method for establishing a session in advance and a method for releasing the session in advance;
the method for establishing the pre-established session is used for: establishing a session between the MCPTT trunking system and the MCPTT terminal;
the release method of the pre-established session is used for: releasing the session between the MCPTT trunking system and the MCPTT terminal;
the method for the interaction between the MCPTT participation server and the media forwarding server is used for: applying for and releasing system resources of a pre-established session;
the method for the interaction between the MCPTT participation server and the media forwarding server comprises the following steps: a system resource acquisition method, a system resource release method, a method for pre-establishing a session and call binding, and a method for pre-establishing a session and call unbinding;
the system resource acquisition method comprises the following steps: the MCPTT participating server acquires system resources from the media forwarding server;
the system resource release method comprises the following steps: the MCPTT participating server informs the media forwarding server to release system resources;
the method for pre-establishing the session and the call binding comprises the following steps: the media forwarding server establishes the binding of system resources and the call;
the method for pre-establishing the session and unbinding the call comprises the following steps: the media forwarding server releases the binding of the system resource and the call;
the call setup and hangup method is used for: establishing and hanging up single calls and group calls based on pre-established sessions;
the call establishment and hanging-up method comprises the following steps: a single call establishing method, a single call hanging-up method, a group call establishing method and a group call hanging-up method;
the single call establishing method comprises the following steps: the MCPTT trunking system establishes a single call based on a pre-established session;
the single call hanging-up method comprises the following steps: the MCPTT cluster system hangs up the single call based on the pre-established session;
the group call establishing method comprises the following steps: the MCPTT trunking system establishes a group call based on a pre-established session;
the group calling hang-up method comprises the following steps: the MCPTT cluster system hangs up the group calling based on the pre-established session;
the speaking right control method is used for: controlling the speaking right application, the speaking right release, the speaking right queuing and the speaking right preemption based on the pre-established session;
before applying the establishment method of pre-established session, firstly, the MCPTT terminal is accessed;
the MCPTT terminal access comprises the following steps:
1) after receiving a TCP long connection request sent by an MCPTT terminal, the MCPTT cluster system stores socket information parameters of the TCP long connection;
2) after receiving an access request sent by an MCPTT terminal, the MCPTT trunking system updates session information of the MCPTT terminal and sends a 200OK signaling to the MCPTT terminal;
3) the MCPTT trunking system starts a link monitoring timer to monitor the connection state of the MCPTT terminal and waits for other control signaling sent by the MCPTT terminal;
4) the MCPTT trunking system enters a blocking state and waits for the access of other MCPTT terminals;
the method for establishing the pre-established session comprises the following steps:
1) the MCPTT participating server receives a request for establishing a pre-established session sent by the MCPTT terminal;
2) the MCPTT participating server sends a sessionReq signaling, applies for system resources of a pre-established session to the media forwarding server, and waits for the reply of the media forwarding server;
3) after receiving the reply of the media forwarding server, the MCPTT participating server saves the system resources acquired from the media forwarding server;
4) the MCPTT participation server sends a 200OK signaling to inform the MCPTT terminal that the session is established successfully in advance;
the system resource acquisition method comprises the following steps:
1) a media forwarding server receives a system resource application request sent by an MCPTT participating server;
2) the media forwarding server establishes a state machine for pre-establishing a session state indication;
3) the media forwarding server allocates a system port for the pre-established session;
4) the media forwarding server informs the MCPTT participation server of successful allocation of system resources.
2. The MCPTT-based trunking system pre-establishment session method of claim 1, wherein: the group call establishing method comprises the following steps:
1) the MCPTT trunking system receives an SIP-REFER signaling sent by the MCPTT terminal;
2) the MCPTT trunking system establishes a state machine for indicating the call state;
3) the MCPTT participation server sends a SessionBind signaling to inform the media forwarding server to bind system resources and call;
4) the MCPTT participation server sends a CONNECT signaling to inform the MCPTT terminal that the group calling is successfully established.
3. The MCPTT-based trunking system pre-establishment session method of claim 1, wherein: the speaking right application in the speaking right control method comprises the following steps:
1) the MCPTT trunking system receives a FloorRequest signaling sent by the MCPTT terminal;
2) the MCPTT cluster system judges whether to grant the MCPTT terminal speaking right by using a speaking right control method;
3) the MCPTT trunking system sends FloorGranted signaling to the MCPTT terminal applying for the speaking right;
4) the MCPTT trunking system sends FloorTaken signaling to other MCPTT terminals participating in the call.
4. The MCPTT-based trunking system pre-establishment session method of claim 1, wherein: the MCPTT based cluster system is built on a cloud platform, and the MCPTT terminal is connected with the cloud platform and accessed to the MCPTT cluster system.
5. The MCPTT-based clustered system pre-establishment session method of claim 4, wherein: the MCPTT terminal is connected with the cloud platform through a public mobile communication network.
6. The MCPTT-based cluster system pre-establishment session method of claim 5, wherein: the public mobile communication network includes: 3G and 4G.
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| 《Technical Specification Group Core Network and Terminals Mission Critical Push To Talk （MCPTT） media plane control；Protocol specification（Release 15）》;3GPP;《3GPP TS 24.380 v15.4.0》;20181221;第3.1节，第4.1.2节，第4.2节，第6.3.5节，第9.3.2节，图4.2.4-1 * |
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