CN108076449B - Emergency call method, trunking communication system, base station and control device - Google Patents
Emergency call method, trunking communication system, base station and control device Download PDFInfo
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Abstract
The invention relates to an emergency call method, a trunking communication system, a base station and a control device, wherein the method comprises the following steps: the base station receives a second call request signaling sent by the terminal and is connected with the terminal according to the second call request signaling; after the base station is connected with the terminal, the control device receives a second call request signaling transmitted by the terminal and transmitted by the base station, determines a shared channel corresponding to the second call request signaling according to the second call request signaling, and transmits the shared channel to the terminal through the base station so as to indicate the terminal to occupy the shared channel; the shared channel is established and cached according to a first call request signaling after the control device receives the first call request signaling sent by the terminal; and after determining the shared channel corresponding to the second call request signaling, the control device sends the second call request signaling to the dispatching desk, and the dispatching desk establishes a call according to the second call request signaling. The invention reduces the calling time delay and avoids the repeated establishment of the calling channel.
Description
Technical Field
The present invention relates to the field of trunking communications, and in particular, to an emergency call method, a trunking communication system, a base station, and a control apparatus.
Background
In the existing trunking private network, the calling and talking are mainly through the terminal input number, and are all processed by the base station and then transmitted to the trunking core network for control access, and the flow of the emergency call is basically the same as that of the ordinary call; for the wide and narrow band trunking private network, the time delay consumed by air interface transmission and IP (Internet Protocol) routing at the wired end is relatively large in the whole call establishment. While the latency requirements for emergency calls are higher.
The emergency call is a special call type with less requirement on low time delay, and the call does not need to be dialed like a common call when the emergency call is carried out at present, so that the time consumption caused by dialing in an emergency situation is avoided; in special cases, the frequency of emergency calls is high, and the emergency calls and the normal calls are the same call flow at the core network side.
The emergency call is not processed by a special flow process in the prior art, so that the advantages of processing the call uniformity by the core network, processing the common call and the emergency call together, simple processing and simple and convenient control are achieved.
For emergency calls, mainly broadband trunked emergency call solutions in private networks, the prior art key technology features of these emergency call solutions are as follows:
1. in the existing emergency call, the core network is connected through the base station as the common call, and finally the core network is connected to the dispatching desk. When the core network processes an emergency call or a normal call, the core network needs to apply for media resources to establish a channel for a user call.
2. If the resources of the core network are insufficient, such as insufficient control blocks of the service, network resources, memory, CPU (Central Processing Unit) Processing capability, and the like; at this time, the core network will tear down the call with low priority to ensure the establishment of the emergency call.
3. When the emergency call is finished, the core network and the base station release the call link and call resources, such as memory, of the whole system. If the emergency call is to be initiated again, it must be established again according to the previous emergency call flow.
The main disadvantages of the prior art are as follows:
1. when the call is normally established in the whole call flow, the time delay of the call is longer; the time delay for each call setup is as long as the first time;
2. when the call service of the cluster system is busy and the call resources are insufficient, the common call resources are firstly removed, and then the emergency call is established. This also results in an emergency call that is too long. And can result in frequent failures of ordinary calls in emergency situations;
3. the signaling transmitted in the procedure of establishing an emergency call is a bit more, which may cause a CPU of a server where a network element is located in a TCN (Trunking core network) to increase load.
Disclosure of Invention
The present invention provides an emergency call method, a trunking communication system, a base station, and a control device, aiming at the above-mentioned defects in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: an emergency call method of constructing a group communication system, the method comprising the steps of:
A. a base station receives a second call request signaling sent by a terminal, and is connected with the terminal according to the second call request signaling, wherein the second call request signaling carries a call type identifier and a terminal identifier;
B. after the base station is connected with the terminal, the control device receives a second call request signaling transmitted by the terminal and transmitted by the base station, determines a shared channel corresponding to the second call request signaling according to the second call request signaling, and transmits the shared channel to the terminal through the base station so as to indicate the terminal to occupy the shared channel;
the shared channel is established and cached according to a first call request signaling after the control device receives the first call request signaling sent by the terminal;
C. and after determining the shared channel corresponding to the second call request signaling, the control device sends the second call request signaling to a dispatching desk, and the dispatching desk establishes a call channel according to the second call request signaling.
Preferably, the step a includes:
a1, the base station receives a second call request signaling sent by the terminal, judges whether the second call request signaling is an emergency call signaling according to a call type identifier carried by the second call request signaling, if so, connects with the terminal according to the call type of the terminal, and establishes the associated information between the base station and the terminal;
a2, the base station sends emergency call signaling to the control device based on the terminal identification; the emergency call signaling carries the terminal identifier and the associated information.
Preferably, the step B includes:
b11, the control device receives the emergency call signaling sent by the base station, and determines a shared channel corresponding to the terminal identifier according to the terminal identifier;
and B12, allocating the shared channel corresponding to the terminal identification to the terminal.
Preferably, the control device includes: the system comprises a mobile management entity module, a cluster control function module and a scheduling server;
the step B comprises the following steps:
b21, the mobility management entity module receives the emergency call signaling, and determines a control block corresponding to the terminal identifier according to the terminal identifier; the control block is a control block stored in the mobility management entity module;
b22, determining a shared channel corresponding to the terminal identification through the control block, and distributing the shared channel to the terminal;
b23, determining the cluster control function module corresponding to the terminal identification through the control block, and sending the emergency call signaling to the cluster control function module;
b24, the cluster control function module sends the emergency call signaling to the dispatch server.
Preferably, the step C includes:
c11, the dispatch server sends the emergency call signaling to a dispatch station;
c12, the dispatching desk receives and processes the emergency call signaling, and establishes a call channel with the dispatching server.
Preferably, the method further comprises:
D. after the dispatching desk establishes a call channel according to the second call request signaling, a response message of successful call establishment is returned to the control device;
E. the control device returns a response message of successful call establishment to the base station;
F. and the base station receives and returns the response message of successful call establishment to the terminal.
Preferably, the shared channel includes a plurality of shared channels, and the service quality of each shared channel is the highest level.
The invention also provides a trunking communication system, which comprises a terminal, a base station, a control device and a dispatching desk, wherein the terminal, the base station, the control device and the dispatching desk are in communication connection through a network and are used for realizing the emergency call method of the trunking communication system.
The invention also provides an emergency call method of the cluster communication system, which comprises the following steps:
a base station receives a second call request signaling sent by a terminal and is connected with the terminal according to the second call request signaling, wherein the second call request signaling carries a call type identifier and a terminal identifier;
after the base station is connected with the terminal, sending a second call request signaling sent by the terminal to a control device;
the base station receives a shared channel which is sent by the control device and corresponds to the second call request signaling, and sends the shared channel to the terminal so as to indicate the terminal to occupy the shared channel, thereby realizing call establishment between the terminal and the control device;
the shared channel is a shared channel which is established and cached according to a first call request signaling after the control device receives the first call request signaling sent by the terminal.
Preferably, the step that the base station receives a second call request signaling sent by the terminal, and connects to the terminal according to the second call request signaling includes:
the base station receives a second call request signaling sent by the terminal, judges whether the second call request signaling is an emergency call signaling according to a call type identifier carried by the second call request signaling, if so, connects with the terminal according to the call type of the terminal, and establishes associated information between the base station and the terminal;
the base station sends emergency call signaling to the control device based on the terminal identification; the emergency call signaling carries the terminal identifier and the associated information.
The present invention also provides a base station comprising a first processor, a first memory, and a first communication module, wherein,
the first communication module is used for communicating with the control device and the terminal;
the first memory to store program instructions;
the first processor is configured to invoke the program instructions to perform the emergency call method of the group communication system as described above.
The invention also provides an emergency call method of the cluster communication system, which comprises the following steps:
the control device receives a second call request signaling transmitted by a terminal and transmitted by a base station, and determines a shared channel corresponding to the second call request signaling according to the second call request signaling;
sending the shared channel to the base station, and sending the shared channel to the terminal through the base station to indicate that the terminal occupies the shared channel;
the shared channel is established and cached according to a first call request signaling after the control device receives the first call request signaling sent by the terminal;
and after determining the shared channel corresponding to the second call request signaling, the control device sends the second call request signaling to a dispatching desk, and establishes a call with the dispatching desk through the second call request signaling.
Preferably, the method further comprises:
the control device receives a response message of successful call establishment returned by the dispatching desk;
and the control device sends the response message of successful call establishment to the base station, and sends the response message of successful call establishment to the terminal through the base station to complete call establishment.
The invention also provides a control device comprising a second processor, a second memory and a second communication module, wherein,
the second communication module is used for communicating with a base station and a dispatching desk;
the second memory to store program instructions;
the second processor is configured to invoke the program instructions to perform the emergency call method of the group communication system as described above.
The emergency call method of the cluster communication system has the following beneficial effects: the cluster emergency call method of the invention does not need to reestablish the emergency call link from the second time to the subsequent emergency call except that the first time of needing to establish the emergency call occupies more time delay, thereby greatly reducing the time delay of establishing the call; meanwhile, the transmission of signaling is reduced, the call response speed is improved, the original common call link is prevented from being dismantled as far as possible due to insufficient media and control resources, and the call quality is ensured while the call delay is improved.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a call flow diagram of a first emergency call in a group communication system;
fig. 2 is a flow chart illustrating an emergency call method of the group communication system of the present invention;
FIG. 3 is a block diagram of the cluster communication system organization of the present invention;
fig. 4 is a call flow diagram of the group communication system of the present invention starting from a second emergency call;
fig. 5 is an emergency call scenario setup diagram of the group communication system of the present invention;
fig. 6 is a flowchart illustrating an emergency call method of the trunking communication system according to another embodiment of the present invention;
FIG. 7 is a schematic diagram of a base station according to the present invention;
fig. 8 is a flowchart illustrating an emergency call method of the trunking communication system of the present invention according to yet another embodiment;
fig. 9 is a schematic structural diagram of a control device of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Fig. 2 is a schematic flowchart of an emergency call method of a trunking communication system according to the present invention, in this embodiment, the control device may be a Trunking Core Network (TCN) in the trunking communication system, and specifically, the emergency call method of the trunking communication system of this embodiment includes the following steps:
A. and the base station receives a second call request signaling sent by the terminal, and is connected with the terminal according to the second call request signaling, wherein the second call request signaling carries the call type identifier and the terminal identifier.
In this step, the second call request signaling may be call request signaling from the terminal after the second time (including the second time). When a terminal initiates a call request to a base station, a signaling channel needs to be established with the base station, and then radio resource control connection must be established (namely RRC connection Setup), and meanwhile, in the RRC connection process, a request signaling sent by the terminal carries a call type identifier and a terminal identifier of the terminal, where the call type identifier can be used to identify the type of the request signaling sent by the terminal (such as an emergency call, a normal call, a voice call, an audio/video call, or the like); the call type identifier may be identified by a corresponding location in the signaling (e.g., identified by a 01, 10, etc. field). The terminal identifier can be used for identifying a terminal, for example, a terminal a or a terminal B sends a call request signaling to a base station, and after the base station receives the call request signaling, the terminal identifier of the terminal can identify whether the terminal a or the terminal B sends the call request signaling to the terminal a or the terminal B; the terminal id may also be represented by corresponding fields, such as 0001 for terminal a, 00010 for terminal B, etc. It should be noted that the identifier of the terminal may be identified in different manners, and is not limited to the specific example described above.
Further, the present embodiment may be applicable to a trunking communication system with multiple terminals and multiple base stations, that is, the terminals and the base stations of the present embodiment may both include multiple terminals and multiple base stations.
Optionally, in this embodiment, step a may include step a1 and step a 2.
Step A1, the base station receives a second call request signaling sent by the terminal, judges whether the second call request signaling is an emergency call signaling according to a call type identifier carried by the second call request signaling, if so, connects with the terminal according to the call type of the terminal, and establishes the associated information between the base station and the terminal.
In this step, after receiving a second call request signaling sent by the terminal, the base station first makes a judgment according to the call type carried by the second call request signaling to determine the call type (for example, a normal call or an emergency call) of the terminal; and if the call type of the terminal is judged to be the emergency call, establishing connection with the terminal.
The specific connection between the base station and the terminal is as follows: when the base station determines that the call type of the terminal is an emergency call, the base station performs association mapping on a signaling (namely, a second call request signaling sent by the terminal) of an air interface side between the base station and the terminal and a wired side link of a control side according to the emergency call type of the terminal (namely, establishes association information between the base station and the terminal), and exchanges the media information of the terminal at the moment with the media information of the base station through the association mapping, so that the media of the terminal is connected with a media channel of the base station, and the communication of the signaling between the base station and the terminal is completed.
Step A2, the base station sends emergency call signaling to the control device based on the terminal identification; the emergency call signaling carries the terminal identification and associated information.
During the execution of step a1, the base station executes step a2 at the same time, i.e., step a1 and step a2 may be executed synchronously. The base station receives a second call request signaling sent by the terminal, extracts the terminal identification carried in the second call request signaling (in the process of establishing association mapping between the base station and the terminal), and sends an emergency call signaling to the control. The related information carried in the emergency call signaling includes, but is not limited to, address information of the terminal, media information of the terminal, a call type of the terminal, a correspondence between the terminal and the base station, address information of the base station, media information of the base station, and the like.
It is to be understood that, when it is determined in step a1 that the second call request signaling sent by the terminal is not an emergency call (e.g., a normal call), the base station does not send emergency call signaling to the control device, and the call service will not occupy the emergency call channel.
B. And the control device receives a second call request signaling transmitted by the terminal and transmitted by the base station after the base station is connected with the terminal, determines a shared channel corresponding to the second call request signaling according to the second call request signaling, and transmits the shared channel to the terminal through the base station so as to indicate the terminal to occupy the shared channel.
Optionally, multiple sharing channels may be set, and the service quality of each sharing channel is set to the highest level. The number of the shared channels can be set according to the number of users (i.e. the number of emergency calls) accessed by the base station, the number of the shared channels can be correspondingly increased when the number of users accessed by the base station is large, and the number of the shared channels can be correspondingly reduced when the number of users accessed by the base station is small.
Because the service quality required by different terminals is different, the service quality of the shared channel can be set to the highest level when the shared channel is established, thereby ensuring that all services can communicate according to the requirements of the terminals.
The shared channel is established and cached according to a first call request signaling after the control device receives the first call request signaling sent by the terminal.
Specifically, as shown in fig. 1, fig. 1 is a call flow diagram of a first emergency call in a group communication system; firstly, before establishing the emergency call, the network elements such as the base station (eNB), the mobility management entity module (MME), the trunking gateway (XGW) and the like are attached and registered successfully (namely, after the network elements are registered in the trunking control function module (TCF), the call connection can be established)
After the attachment and registration are completed, the terminal (UE) sends a Call Request (Call Request), i.e. signaling 1 to signaling 3, to the cluster control function module (TCF), which receives the Call Request, applies for media resources from the cluster media function module (TMF), and sends the signaling requesting the Call to the dispatching desk server (DCS), which then sends the Request to the DC, i.e. signaling 4 to signaling 5.
After receiving and processing the call request signaling of the TCF, a dispatching desk server (DCS) sends ringing messages, namely signaling 6 to signaling 11, to the UE terminal through the TCF, the MME and the eNB, and informs the trigger MME to establish a call dedicated bearer at an LTE (mobile network) broadband side.
When the DC dispatching desk receives the call request signaling sent by the DCs, it processes the signaling and sends a response 200OK to the DCs to accept the call request (i.e., signaling 8), and at this time, the DCs processes the 200OK message and then sends a confirmation message (signaling 9) to the DC of the response that the call setup is successful, and at the same time, transmits the response to accept the call setup request, i.e., signaling 12 to 15, to the UE through the TCF, MME and eNB.
After the UE processes, the UE sends a response message of successful call setup, i.e. signaling 16 to signaling 18, to the TCF through eNB and MME.
In the whole process:
(1) when the TCF receives a call request message, namely a signaling 3, sent by the MME, the TCF applies for TMF media resources of a calling party and a called party from the TMF, then sends the TMF resource information of the called party to the DC through signaling 4 and signaling 5, and then sends the media resources of the DC to the TMF through signaling 8 and signaling 12, so that the media information exchange between the TMF and the DC is successful.
(2) After receiving a call request message, namely signaling 3, sent by the MME, the TCF applies for TMF media resources of the calling party and the called party from the TMF, and then sends the TMF media resources of the calling party to the MME through signaling 7, triggers the MME to establish a dedicated bearer for the call, and sends bearer resource information to the TCF through signaling 18, and then to the TMF, where media resources between the TMF and XGW and the eNB are exchanged. Thereby opening up the media link from the UE to the DC.
After the call is finished, only the air interface link between the terminal and the base station and the link between the dispatching desk server and the dispatching desk are released in the whole call system, and the IP link between the middle base station, the mobility management entity module, the trunking gateway, the trunking control function module, the trunking media function module and the dispatching desk server is not released, that is, as shown in fig. 3, the emergency call link between the base station and the control device and between the base station and the dispatching desk server are not released, and the established emergency call link is cached as a shared channel to be used as a media link for a subsequent emergency call. It is understood that the shared channel may be provided in a plurality according to the number of users received by the base station.
Optionally, in this embodiment, step B may include:
b11, the control device receives the emergency call signaling sent by the base station, and determines the sharing channel corresponding to the terminal identification according to the terminal identification.
Since resources in a link of an intermediate server section of an emergency call path established according to a first emergency call (initial emergency call) are not released, the initially established emergency call path can be reused when performing second, third, … …, and nth emergency calls. Therefore, when the control device receives the emergency call signaling sent by the base station, the shared channel corresponding to the terminal identifier is searched in the cached shared channels according to the terminal identifier carried in the emergency call signaling, and a new emergency call channel does not need to be established according to the emergency call signaling.
And B12, allocating the shared channel corresponding to the terminal identification to the terminal.
Optionally, as shown in fig. 3, the control device of this embodiment may include a mobility management entity module, a cluster control function module, and a scheduling server. The mobile management entity module, the cluster control function module and the scheduling server are used for executing the following steps:
b21, the mobile management entity module receives the emergency call signaling, and determines a control block corresponding to the terminal identifier according to the terminal identifier.
The control block is stored in the mobility management entity module. It can be understood that, in this embodiment, the control block may be implemented by a corresponding memory, where the control block stores link information of the shared channel, information of the terminal, and information of the base station, and after finding the control block corresponding to the terminal identifier, the shared channel corresponding to the terminal identifier may be determined according to the information stored in the control block.
B22, determining the sharing channel corresponding to the terminal identification through the control block, and distributing the sharing channel to the terminal.
And after the shared channel corresponding to the terminal identifier is determined, the shared channel is distributed to the terminal, so that the terminal is connected with the whole shared channel.
B23, determining the cluster control function module corresponding to the terminal identification through the control block, and sending the emergency call signaling to the cluster control function module.
And B24, the cluster control function module sends the emergency call signaling to the dispatch server.
C. And after determining the shared channel corresponding to the second call request signaling, the control device sends the second call request signaling to the dispatching desk, and the dispatching desk establishes a call according to the second call request signaling.
Optionally, in this embodiment, step C may include step C11 and step C12.
C11, the dispatching server sends the emergency call signaling to the dispatching desk;
c12, the dispatching desk receives and processes the emergency call signaling, and establishes a call with the dispatching server.
Specifically, after receiving the emergency call signaling, the dispatch server sends the emergency call signaling to the dispatch station, and the dispatch station processes the emergency call signaling according to the received emergency call signaling to establish a call, i.e., to complete the connection between the dispatch station server and the dispatch station.
Further, the emergency call method of the trunking communication system of the embodiment may further include the following steps:
D. after the dispatching desk establishes a call according to the second call request signaling, a response message of successful call establishment is returned to the control device;
E. the control device returns a response message of successful call establishment to the base station;
F. and the base station receives and returns a response message of successful call establishment to the terminal.
And according to the steps, the establishment of the emergency call for the second time or later can be completed.
By the method, the problem of time delay of establishment when the emergency call is established is solved, the process of establishing the emergency call is simplified, the scheme reduces the repeated establishment of a media link and signaling transmission, and achieves the effect of reducing the reestablishment of the link and reducing the time delay of the emergency call because the shared channel established for the first time is reused and the resources of each network element in the control device are reserved in the establishing process; the problem that resources are released for establishing and using the emergency call due to the fact that network element resources are insufficient is solved, the shared link can be reserved for the emergency call, the common call cannot be used, the problem that the previous common call is removed due to insufficient resources does not exist, and the original common call link is prevented from being removed due to the fact that media and control resources are insufficient to the greatest extent.
Referring to fig. 4, fig. 4 is a call flow diagram of the trunking communication system of the present invention starting from the second emergency call.
As shown in fig. 4, after the first emergency call is established and the call is over, since the intermediate shared channel (the media channel and the resources in the base station and the control device) is not released, a new emergency call can be quickly established again by using the shared channel established for the first time in the subsequent emergency call.
Specifically, after the first emergency call is finished, the system already establishes a shared channel, when a terminal initiates a call request to a base station, a signaling channel needs to be established with the base station, and then a radio resource control connection (namely, RRC connection Setup) needs to be established, meanwhile, in the RRC connection process, a request signaling (a second call request signaling) sent by the terminal carries a call type identifier and a terminal identifier of the terminal, after the base station receives the call request signaling, a signaling at a blank side and a media link are subjected to a correlation mapping with a wired side link at a control device side according to the emergency call type of the terminal, and the purpose of the mapping is to exchange the media information of the terminal at the moment with the media information of the base station once so that the media of the terminal is connected with the media channel of the base station;
the base station extracts the terminal identification in the second call request signaling in the mapping process and sends the terminal identification to a mobility management entity module (MME) through a signaling 2 (emergency call signaling), the MME receives the emergency call signaling and locates the emergency call signaling to a control block corresponding to the emergency call signaling (wherein the control block is a call control block of the MME established through the terminal identification when the MME receives the emergency call for the first time, the latter emergency call can locate the control block established before through the terminal identification, and then the terminal is connected with the whole shared channel), and then informs a dispatching desk server (DCS) and a dispatching Desk (DC) to establish a media channel through a cluster control function module (TCF), namely a signaling 3 and a signaling 4, and when the call channel of the DCS and the DC is established successfully, the DCS sends a call establishment success response to the eNB through the TCF MME, and transmits this response to the terminal (UE).
It should be noted that signaling 1, signaling 9, and signaling 10 in fig. 4 are procedures for establishing a media channel between the UE and the eNB, and the procedures are performed simultaneously with signaling 2 to signaling 4. When the response of the DCS side is successful in establishing the call, the media channel between the UE and the base station is also completed.
It can be understood that, in the above whole flow, the main purpose is to open a media channel between the terminal and the base station and a media channel between the dispatcher station server and the dispatcher station, and the media channel between the base station and the dispatcher station server is shared with a call media channel which is not released therebetween.
The invention also provides a trunking communication system, which comprises a terminal, a base station, a control device and a dispatching desk, wherein the terminal, the base station, the control device and the dispatching desk are in communication connection through a network and are used for realizing the emergency call method of the trunking communication system.
As shown in fig. 3, when an emergency call is initially established, the established procedure is as shown in fig. 1, but after the emergency call is ended, only air interface links between the terminal and the base station and links between the dispatching desk server and the dispatching desk are released in the whole call system, while IP links between the intermediate base station (eNB), the mobility management entity module (MME), the trunking gateway (XGW), the trunking control function module (TCF), the trunking media function module (TMF) and the dispatching desk server (DCS) are not released, and at this time, the terminal identifier sent to the MME by the eNB may use a general terminal identifier specially divided for the emergency call.
Therefore, the resources in the link of the intermediate server department of the emergency call channel established for the first time are not released, and the 2 nd or the nth emergency call can be reused to quickly establish the emergency call, for example, the black-bold-marked link in fig. 3.
The resources pre-occupied in the black-bold-portion-marked link and the network element connected to the link in fig. 3 are as follows:
carrying tunnel resources: GTP bearer resources between eNB and XGW after the initial establishment of the link for the emergency call;
IP and Port resources: XGW and IP and Port resources between the TMF and the DCS and media and IP and Port resources between the TMF and the DCS;
memory such as control blocks in each network element: the method comprises the steps of reserving memory in the eNB and the memory resources of the control block of the MME \ XGW \ TCF \ TMF \ DCS dispatching desk server.
The resources are not released, so that resource guarantee is provided for the repeated use of the resources when emergency calls are made again later. Therefore, after the emergency call is established for the first time, the resources for the emergency call are not released, and the resources are prepared for the emergency call, so that the reliability of the emergency call is ensured, and the system does not have the resources to dismantle the ordinary call to ensure the establishment of the emergency call.
The reserved media resources and hardware resources are determined according to the actual number of users and the emergency degree; for example, when an emergency special situation often occurs in a region and the number of users is large, a plurality of shared channels (i.e., black bold marked portions in fig. 3) for emergency calls in the region may be reserved, and a plurality of shared channels may also be reserved according to different services, for example, each base station may establish a plurality of such pre-occupied links, when there are a plurality of such base stations, a plurality of channels may also be added for TCF \ TMF \ MME \ XGW, and when an emergency voice or emergency audio/video service requirement is required, a plurality of shared channels such as audio, video, and the like may be established. If the quality of service required by the terminal is not clear, the QoS can be set to the highest level when establishing an emergency call, thus ensuring that all services can communicate as required by the terminal.
Referring to fig. 5, fig. 5 is a diagram illustrating an emergency call scenario setup of the trunking communication system of the present invention. The specific scenario setup is shown in fig. 5: when the user of the terminal under the base station a is making a normal call and the user of the terminal under the base station B is making an emergency call, the processing capability of the trunking core network is close to saturation.
In this case, if several users under base station a and base station B want to make emergency calls, several scenarios may occur:
(1) the emergency call is not put through;
(2) when the ordinary call is needed, the call can not be carried out;
(3) the time for establishing an emergency call is too long, and it takes a long time each time an emergency call is made.
The above possible situations can be mainly as follows: the processing capacity of the core network is insufficient, so that the CPU or the memory of the core network is insufficient, and the like; when an emergency call is carried out, if the resources of a core network are insufficient, the common call is firstly dismantled, and then the released common call resources are utilized to establish the emergency call, so that the time for establishing the emergency call is too long; because the priority of the emergency call is high, when the ordinary call is needed, the ordinary call can not be carried out due to insufficient resources because the priority of the ordinary call is the same; because the flow of each emergency call establishment is the same, the time delay of each emergency call establishment is large.
When the emergency call method of the cluster communication system is adopted, when the emergency calls under the base station A are not many, the number of the emergency shared channels which are established can be set to be 3, the emergency calls of the base station B are more, and the emergency call shared channels corresponding to the base station B can be set to be 6, so that when the emergency call is ended after the emergency call is established for the first time and the emergency call needs to be carried out again, the time delay for establishing the emergency call is greatly shortened by utilizing the pre-established and cached emergency call shared channels, the situation that the emergency call cannot be called is avoided, and the emergency call flow is simplified by a lot compared with the flow in the prior art, so that the core network resources consumed by the subsequent emergency call are greatly reduced, and further the common call can be successfully called as far as possible.
Referring to fig. 6, fig. 6 is a flowchart illustrating an emergency call method of a trunking communication system according to another embodiment of the present invention.
As shown in fig. 6, the emergency call method of the trunking communication system of the present embodiment includes the following steps:
s61, the base station receives a second call request signaling sent by the terminal and is connected with the terminal according to the second call request signaling, and the second call request signaling carries the call type identifier and the terminal identifier.
In this step, the second call request signaling may be call request signaling from the terminal after the second time (including the second time). When a terminal initiates a call request to a base station, a signaling channel needs to be established with the base station, and then radio resource control connection must be established (namely RRC connection Setup), and meanwhile, in the RRC connection process, a request signaling sent by the terminal carries a call type identifier and a terminal identifier of the terminal, where the call type identifier can be used to identify the type of the request signaling sent by the terminal (such as an emergency call, a normal call, a voice call, an audio/video call, or the like); the call type identifier may be identified by a corresponding location in the signaling (e.g., identified by a 01, 10, etc. field). The terminal identifier can be used for identifying a terminal, for example, a terminal a or a terminal B sends a call request signaling to a base station, and after the base station receives the call request signaling, the terminal identifier of the terminal can identify whether the terminal a or the terminal B sends the call request signaling to the terminal a or the terminal B; the terminal id may also be represented by corresponding fields, such as 0001 for terminal a, 00010 for terminal B, etc. It should be noted that the identifier of the terminal may be identified in different manners, and is not limited to the specific example described above.
The optional step S61 may include step S611 and step S612.
Step S611, the base station receives a second call request signaling sent by the terminal, determines whether the second call request signaling is an emergency call signaling according to a call type identifier carried by the second call request signaling, and if so, connects with the terminal according to the call type of the terminal, and establishes association information between the base station and the terminal.
The specific connection between the base station and the terminal is as follows: when the base station determines that the call type of the terminal is an emergency call, the base station performs association mapping on a signaling (namely, a second call request signaling sent by the terminal) of an air interface side between the base station and the terminal and a wired side link of a control side according to the emergency call type of the terminal (namely, establishes association information between the base station and the terminal), and exchanges the media information of the terminal at the moment with the media information of the base station through the association mapping, so that the media of the terminal is connected with a media channel of the base station, and the communication of the signaling between the base station and the terminal is completed.
Step S612, the base station sends an emergency call signaling to the control device based on the terminal identification; the emergency call signaling carries the terminal identification and associated information.
The associated information carried in the emergency call signaling includes, but is not limited to, address information of the terminal, media information of the terminal, a call type of the terminal, a correspondence between the terminal and the base station, address information of the base station, media information of the base station, and the like.
It is understood that when the second call request signaling sent by the terminal is determined not to be an emergency call (e.g., a normal call), the base station does not send emergency call signaling to the control device, and the call service will not occupy an emergency call channel.
S62, after the base station is connected to the terminal, the base station sends the second call request signaling sent by the terminal to the control device.
S63, the base station receives the shared channel corresponding to the second call request signaling sent by the control device, and sends the shared channel to the terminal, so as to instruct the terminal to occupy the shared channel, thereby implementing call establishment between the terminal and the control device.
It should be noted that the shared channel received by the base station is a shared channel that is established and buffered according to the first call request signaling after the control device receives the first call request signaling sent by the terminal. Optionally, multiple sharing channels may be set, and the service quality of each sharing channel is set to the highest level. The number of the shared channels can be set according to the number of users (i.e. the number of emergency calls) accessed by the base station, the number of the shared channels can be correspondingly increased when the number of users accessed by the base station is large, and the number of the shared channels can be correspondingly reduced when the number of users accessed by the base station is small.
Because the service quality required by different terminals is different, the service quality of the shared channel can be set to the highest level when the shared channel is established, thereby ensuring that all services can communicate according to the requirements of the terminals.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention.
In this implementation, the base station 700 may include:
a first processor 71, a first memory 73, and a first communication module 72, wherein,
a first communication module 72 for communicating with the control device and the terminal.
A first memory 73 for storing program instructions.
A first processor 71 configured to invoke program instructions to perform the steps of:
and receiving a second call request signaling sent by the terminal, and connecting the second call request signaling with the terminal according to the second call request signaling, wherein the second call request signaling carries a call type identifier and a terminal identifier.
And after the terminal is connected, sending the second call request signaling sent by the terminal to the control device.
And receiving a shared channel corresponding to the second call request signaling sent by the control device, and sending the shared channel to the terminal to indicate the terminal to occupy the shared channel, so as to realize call establishment between the terminal and the control device.
The shared channel is a shared channel which is established and cached according to a first call request signaling after the control device receives the first call request signaling sent by the terminal.
Further, the first processor 71 is configured to invoke program instructions to specifically perform the following steps:
receiving a second call request signaling sent by the terminal, judging whether the second call request signaling is an emergency call signaling according to a call type identifier carried by the second call request signaling, if so, connecting with the terminal according to the call type of the terminal, and establishing association information between the base station and the terminal.
Based on the terminal identification, sending an emergency call signaling to the control device; the emergency call signaling carries the terminal identification and associated information.
Referring to fig. 8, fig. 8 is a flowchart illustrating an emergency call method of a trunking communication system according to another embodiment of the present invention.
As shown in fig. 8, the emergency call method of the trunking communication system of the present embodiment includes the following steps:
s81, the control device receives a second call request signaling sent by the terminal and transmitted by the base station, and determines a shared channel corresponding to the second call request signaling according to the second call request signaling.
And S82, sending the shared channel to the base station, and sending the shared channel to the terminal through the base station to indicate the terminal to occupy the shared channel.
The shared channel is a shared channel which is established and cached according to a first call request signaling after the control device receives the first call request signaling sent by the terminal.
S83, after determining the shared channel corresponding to the second call request signaling, the control device sends the second call request signaling to the dispatching desk, and establishes a call with the dispatching desk through the second call request signaling.
Optionally, the method further comprises the following steps:
and S84, the control device receives the response message of successful call establishment returned by the dispatching desk.
And S85, the control device sends the response message of successful call establishment to the base station, and the base station sends the response message of successful call establishment to the terminal to complete the call establishment.
Referring to fig. 9, fig. 9 is a schematic structural diagram of a control device according to the present invention. In this embodiment, the control device 900 may include: a second processor 91, a second memory 93, and a second communication module 92, wherein,
and a second communication module 92, configured to communicate with the base station and the scheduling station.
A second memory 93 for storing program instructions.
A second processor 91 configured to invoke program instructions to perform the steps of:
and receiving a second call request signaling transmitted by the terminal from the base station, and determining a shared channel corresponding to the second request signaling according to the second call request signaling.
And sending the shared channel to a base station, and sending the shared channel to a terminal through the base station so as to indicate the terminal to occupy the shared channel.
The shared channel is a shared channel which is established and cached according to a first call request signaling after the control device receives the first call request signaling sent by the terminal.
And after determining the shared channel corresponding to the second call request signaling, sending the second call request signaling to the dispatching desk, and establishing a call with the dispatching desk through the second call request signaling.
Further, the second processor is configured to invoke the program instructions to specifically perform the steps of:
and receiving a response message of successful call establishment returned by the dispatching desk.
And sending the response message of successful call establishment to the base station, and sending the response message of successful call establishment to the terminal through the base station to complete call establishment.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (14)
1. A method for emergency calling in a trunked communication system, the method comprising the steps of:
A. a base station receives a second call request signaling sent by a terminal, and is connected with the terminal according to the second call request signaling, wherein the second call request signaling carries a call type identifier and a terminal identifier;
B. after the base station is connected with the terminal, the control device receives a second call request signaling transmitted by the terminal and transmitted by the base station, determines a shared channel corresponding to the second call request signaling according to the second call request signaling, and transmits the shared channel to the terminal through the base station so as to indicate the terminal to occupy the shared channel;
the shared channel is established and cached according to a first call request signaling after the control device receives the first call request signaling sent by the terminal;
C. and after determining the shared channel corresponding to the second call request signaling, the control device sends the second call request signaling to a dispatching desk, and the dispatching desk establishes a call according to the second call request signaling.
2. The emergency call method of the cluster communication system according to claim 1, wherein the step a comprises:
a1, the base station receives a second call request signaling sent by the terminal, judges whether the second call request signaling is an emergency call signaling according to a call type identifier carried by the second call request signaling, if so, connects with the terminal according to the call type of the terminal, and establishes the associated information between the base station and the terminal;
a2, the base station sends emergency call signaling to the control device based on the terminal identification; the emergency call signaling carries the terminal identifier and the associated information.
3. The emergency call method of the cluster communication system according to claim 2, wherein the step B comprises:
b11, the control device receives the emergency call signaling sent by the base station, and determines a shared channel corresponding to the terminal identifier according to the terminal identifier;
and B12, allocating the shared channel corresponding to the terminal identification to the terminal.
4. The emergency call method of the cluster communication system according to claim 2, wherein the control means comprises: the system comprises a mobile management entity module, a cluster control function module and a scheduling server;
the step B comprises the following steps:
b21, the mobility management entity module receives the emergency call signaling, and determines a control block corresponding to the terminal identifier according to the terminal identifier; the control block is a control block stored in the mobility management entity module;
b22, determining a shared channel corresponding to the terminal identification through the control block, and distributing the shared channel to the terminal;
b23, determining the cluster control function module corresponding to the terminal identification through the control block, and sending the emergency call signaling to the cluster control function module;
b24, the cluster control function module sends the emergency call signaling to the dispatch server.
5. The emergency call method of the cluster communication system according to claim 4, wherein the step C comprises:
c11, the dispatch server sends the emergency call signaling to a dispatch station;
c12, the dispatching desk receives and processes the emergency call signaling, and establishes a call with the dispatching server.
6. The emergency call method of the cluster communication system according to claim 1, wherein the method further comprises:
D. after the dispatching desk establishes a call according to the second call request signaling, a response message of successful call establishment is returned to the control device;
E. the control device returns a response message of successful call establishment to the base station;
F. and the base station receives and returns the response message of successful call establishment to the terminal.
7. The emergency call method of the cluster communication system according to claim 1, wherein the shared channel comprises a plurality of shared channels, and the quality of service of each of the shared channels is highest.
8. A trunking communication system, comprising a terminal, a base station, a control device and a dispatching desk, wherein the terminal, the base station, the control device and the dispatching desk are connected by network communication, and are configured to implement the emergency call method of the trunking communication system according to any one of claims 1 to 7.
9. A method for emergency calling in a trunked communication system, the method comprising the steps of:
a base station receives a second call request signaling sent by a terminal and is connected with the terminal according to the second call request signaling, wherein the second call request signaling carries a call type identifier and a terminal identifier;
after the base station is connected with the terminal, sending a second call request signaling sent by the terminal to a control device;
the base station receives a shared channel which is sent by the control device and corresponds to the second call request signaling, and sends the shared channel to the terminal so as to indicate the terminal to occupy the shared channel, thereby realizing call establishment between the terminal and the control device;
the shared channel is a shared channel which is established and cached according to a first call request signaling after the control device receives the first call request signaling sent by the terminal.
10. The emergency call method of the cluster communication system according to claim 9, wherein the step of the base station receiving a second call request signaling sent by the terminal and connecting with the terminal according to the second call request signaling comprises:
the base station receives a second call request signaling sent by the terminal, judges whether the second call request signaling is an emergency call signaling according to a call type identifier carried by the second call request signaling, if so, connects with the terminal according to the call type of the terminal, and establishes associated information between the base station and the terminal;
the base station sends emergency call signaling to the control device based on the terminal identification; the emergency call signaling carries the terminal identifier and the associated information.
11. A method for emergency calling in a trunked communication system, the method comprising the steps of:
the control device receives a second call request signaling transmitted by a terminal and transmitted by a base station, and determines a shared channel corresponding to the second call request signaling according to the second call request signaling;
sending the shared channel to the base station, and sending the shared channel to the terminal through the base station to indicate that the terminal occupies the shared channel;
the shared channel is established and cached according to a first call request signaling after the control device receives the first call request signaling sent by the terminal;
and after determining the shared channel corresponding to the second call request signaling, the control device sends the second call request signaling to a dispatching desk, and establishes a call with the dispatching desk through the second call request signaling.
12. The emergency call method of the cluster communication system according to claim 11, wherein the method further comprises:
the control device receives a response message of successful call establishment returned by the dispatching desk;
and the control device sends the response message of successful call establishment to the base station, and sends the response message of successful call establishment to the terminal through the base station to complete call establishment.
13. A base station comprising a first processor, a first memory, and a first communication module, wherein,
the first communication module is used for communicating with the control device and the terminal;
the first memory to store program instructions;
the first processor, configured to invoke the program instructions, to perform the emergency call method of the group communication system according to claim 9 or 10.
14. A control apparatus comprising a second processor, a second memory, and a second communication module, wherein,
the second communication module is used for communicating with a base station and a dispatching desk;
the second memory to store program instructions;
the second processor, configured to invoke the program instructions, to perform the emergency call method of the group communication system according to claim 11 or 12.
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| WO2021142834A1 (en) * | 2020-01-19 | 2021-07-22 | 深圳市鑫王牌科技发展有限公司 | Emergency call method, terminal device, and server |
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