CN109756853B - Audio and video return link establishing method in broadband cluster system - Google Patents
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Abstract
The application provides a method for establishing an audio and video return link in a broadband cluster system, which comprises the following steps: when a cluster core network side server receives a call request message sent by a calling terminal, determining main media format information for establishing an audio/video return link according to media format information carried in the call request message; respectively establishing audio and video return links with the calling terminal and the called terminal according to the determined main media format information; wherein, the called terminal includes: a called user terminal UE and/or a called dispatching desk DC; when the audio/video return link with the called terminal is established, a return establishment result indication is sent to the calling terminal to inform the calling terminal that the audio/video return link with the called terminal is established. The method can quickly establish the audio and video return link so as to carry out audio and video return.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a method for establishing an audio and video return link in a broadband trunking system.
Background
The broadband trunking system mainly comprises a wireless terminal, a dispatching desk, a trunking base station and a trunking core network, provides broadband access and broadband trunking functions, and has the characteristics of rich functions, convenience in operation and maintenance, flexibility in deployment and the like. The voice service is the most important means and the most dependent communication mode in the private network commanding and dispatching function, the video service directly and objectively reflects the real information of various events, and the video service is an indispensable important basis for the dispatching commander to correctly judge the field condition and appoint an action scheme.
The video scheduling services in the private network command scheduling comprise services of video pull-up, video return, video forwarding, local video pushing, environment interception, environment monitoring and the like. Here, only the video backhaul is a service actively controlled by the terminal, and only the environment listening and environment monitoring has a dispatcher station (DC) to acquire the audio information action of the terminal.
In the related industry of cluster communication, terminal audio and video return requires to send and receive data only, and related scheduling service and bidirectional voice data, so that the usage rate and application space are relatively high. Such as:
police terminal police upload carry police situation description and video, police are with law enforcement information, suspect control and other information upload dispatch platforms or other terminals, make things convenient for the audio frequency and video of backstage recording and video server storage this moment simultaneously.
The portable terminal goes deep into the site and transmits video and voice signals from various sites to a rear vehicle-mounted terminal and/or directly transmits the video and voice signals to a dispatching desk of a command center through a wireless network. The method is combined with the audio and video return service, and meanwhile, the command scheduling function is added, so that the method is applied to command scheduling in various industries at present.
In the B-Trunc protocol, a technical scheme that a terminal actively returns audio and video to a DC and the terminal does not exist.
Disclosure of Invention
In view of this, the present application provides a method for establishing an audio/video backhaul link in a broadband trunking system, which can quickly establish the audio/video backhaul link and further perform audio/video backhaul.
In order to solve the technical problem, the technical scheme of the application is realized as follows:
a method for establishing an audio/video return link in a broadband cluster system comprises the following steps:
when a cluster core network side server receives a call request message sent by a calling terminal, determining main media format information for establishing an audio/video return link according to media format information carried in the call request message;
respectively establishing audio and video return links with the calling terminal and the called terminal according to the determined main media format information; wherein, the called terminal includes: a called user terminal UE and/or a called dispatching desk DC;
when the audio/video return link with the called terminal is established, a return establishment result indication is sent to the calling terminal to inform the calling terminal that the audio/video return link with the called terminal is established.
Wherein the method further comprises:
when a call release request sent by a calling terminal is received, audio and video return links are respectively released with the calling terminal and a called terminal;
and when the audio/video return link with the called terminal is released, sending a return release result indication to the calling terminal to inform the calling terminal that the audio/video return link with the called terminal is released.
Wherein the method further comprises:
when a call release request sent by a called terminal is received, audio and video return link release is carried out with the called terminal;
and when the audio/video return link with the called terminal is released, sending a return release result indication to the calling terminal to inform the calling terminal that the audio/video return link with the called terminal is released.
Wherein the method further comprises:
when a call release request sent by a called terminal is received, if only the called terminal is determined in the current called terminal, audio and video return link release is carried out with a calling terminal.
Wherein the method further comprises:
when a return indication message of a newly added called terminal sent by a calling terminal is received, establishing an audio/video return link with the newly added called terminal;
when the audio/video return link with the called terminal is established, a return establishment result indication is sent to the calling terminal to inform the calling terminal that the audio/video return link with the called terminal is established.
Wherein the method further comprises:
when a return indication message for deleting the called terminal sent by the calling terminal is received, audio and video return link release is carried out between the return indication message and the called terminal to be deleted;
and when the audio/video return link with the called terminal is released, sending a return release result indication to the calling terminal to inform the calling terminal that the audio/video return link with the called terminal is released.
Wherein the method further comprises:
when a request message which is sent by a called terminal and needs to communicate with a calling terminal is received, whether a current speaking right terminal exists is determined, and if yes, a rejection message is sent to the called terminal; otherwise, sending an agreement message to the called terminal; and updating the speaking right state and informing the calling terminal and other called terminals of the updated speaking right state.
Wherein the method further comprises:
when receiving a talk right release message sent by a called terminal, carrying out talk right release aiming at the called terminal and sending a talk right release result message of the called terminal to the called terminal;
and if the current speaking right state is updated, informing the calling terminal and the called terminal of the updated speaking right state.
The Number of the Called Number in the call request message sent by the calling terminal is at least one.
When the called terminal is called UE, the message transmitted and received with the called terminal is a message based on network attached storage NAS protocol; when the called terminal is the called DC, the messages transceived with the called terminal are messages based on the session initiation SIP protocol.
According to the technical scheme, when the calling terminal initiates a request for establishing the audio/video return link, the core network side server performs an audio/video return link establishment process with the called terminal and the calling terminal at the same time, and feeds back an establishment result to the calling terminal when the audio/video return link is established with the called terminal. The technical scheme can quickly establish the audio and video return link so as to carry out audio and video return.
Drawings
Fig. 1 is a schematic diagram illustrating an audio/video return link establishment procedure according to an embodiment of the present application;
fig. 2 is a schematic diagram of a process of a calling terminal initiating release of an audio/video return link in the second embodiment of the present application;
fig. 3 is a schematic diagram of a process of a called terminal initiating release of an audio/video return link in the second embodiment of the present application;
fig. 4 is a schematic flow chart of a newly added called terminal in the third embodiment of the present application;
fig. 5 is a schematic flow chart illustrating a called terminal stopping process in the third embodiment of the present application;
fig. 6 is a schematic flow chart of an audio-video speaking right application in the fourth embodiment of the present application;
fig. 7 is a schematic view illustrating a release process of the audio-video session right in the fifth embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the technical solutions of the present invention are described in detail below with reference to the accompanying drawings and examples.
The embodiment of the application provides an audio and video return link establishment method in a broadband cluster system, when a calling terminal initiates a request for establishing an audio and video return link, a core network side server simultaneously performs an audio and video return link establishment process with a called terminal and the calling terminal, and when the audio and video return link is established with the called terminal, an establishment result is fed back to the calling terminal. The technical scheme can quickly establish the audio and video return link so as to carry out audio and video return.
The following describes in detail the establishment and release of the audio/video backhaul link, the scheduling of the audio/video backhaul service, and the audio/video call right application and release flow in the embodiment of the present application with reference to the accompanying drawings.
Example one
Referring to fig. 1, fig. 1 is a schematic diagram illustrating an audio/video backhaul link establishment procedure according to an embodiment of the present application. The method comprises the following specific steps:
Referring to table 1, table 1 shows contents included in a message transmitted when a CALL REQUEST (CALL REQUEST) is initiated in an embodiment of the present application.
TABLE 1
In table 1, different from the existing implementation, in the call request initiated by the corresponding calling terminal, there is a Called Number [ MAX _ UE _ NUM ], and there may be a plurality of cells.
That is, the Number of Called numbers in the call request message sent by the calling terminal is at least one, that is, the Number of Called terminals is at least one.
For a backhaul, i.e. the backhaul link from the calling terminal to the called terminal, the same parameters should be used for encoding and decoding, and the media negotiation is decided by the core network server.
The calling terminal provides 1 or more sets of media parameters of the call request to the network side as candidates for the server, and the network selects one set of parameters, and the selection rule can be configured in advance.
The core network server selects a set of media parameters of the calling side and immediately sends the parameters to the called terminal, and the called terminal replies to the core network server according to whether the called terminal supports the parameters or not.
Using the network side to negotiate the reason: the called terminal is used as a video receiving side, and even if the camera does not support the resolution of the calling side, the problem of playing the video of the calling side is generally solved. Therefore, the choice of multimedia negotiation is decided by the network side. Meanwhile, the negotiation mode can accelerate the service establishment speed.
And 102, respectively establishing audio and video return links with the calling terminal and the called terminal according to the determined main media format information.
And 103, when the audio/video return link with the called terminal is established, sending a return establishment result indication to the calling terminal to inform the calling terminal that the audio/video return link with the called terminal is established.
The called terminal in the embodiment of the application comprises: the UE and/or the DC may be called UE and/or called DC, that is, the called terminal may be called UE and may be called DC, and it may also need to establish backhaul links with both the called UE and the called DC, and the called UE and the DC may be one or multiple ones.
When the called terminal is called UE, the message transmitted and received with the called terminal is a message based on a Network Attached Storage (NAS) protocol; when the called terminal is a called DC, the message transmitted and received with the called terminal is a message based on a Session Initiation Protocol (SIP) Protocol.
Table 2 shows the contents of the backhaul establishment result indicator (ReBackResultInd) in the embodiment of the present application. The indication is a new message based on the SIP protocol, and the corresponding message carries the content in table 2.
| Cell | Means of |
| Call ID | Call identification |
| Calling Number | Calling party |
| Called Number | Is called party |
| CalledOpt | Called operation state (adding, deleting) |
| Result | Success and failure |
TABLE 2
In the embodiment of the present application, the calling terminal is generally a calling UE, and therefore, a message received and sent with the calling terminal is a message based on an NAS protocol.
The following procedure for establishing an audio/video return link with the calling terminal, the called UE and the called DC is given separately:
the process of establishing the audio/video return link between the core network server and the calling terminal is as follows:
if the UE is in ECM-IDLE state, the UE needs to recover the connection with the network through the SERVICE REQUEST procedure.
Firstly, a calling terminal informs a core network server of needing to establish an audio/video return link through an NAS message calling REQUEST (CALL REQUEST), and media format information is carried in a message, and the method mainly comprises the following steps: call Type, Call Attribute, and Called Number (which may carry 1 or more), and if the Call Type service includes Audio media, then Audio Description, and if the Call Type service includes Video media, then Video Description.
Secondly, the core network server informs the calling media format information through a CALL procedure (CALL procedure) message, which mainly comprises: call ID, Call Type, Call Attribute, Priority, if the Call Type service contains Audio media, then Audio Description, and if the Call Type service contains Video media, then Video Description.
And thirdly, the core network server is matched with the calling terminal to establish corresponding special bearing.
Fourthly, the core network server rings to inform the calling UE of the establishment of the special bearing.
And fifthly, the core network server informs the calling terminal through a CALL CONNECT message, the uplink is connected and data transmission can be carried out.
And sixthly, the calling terminal feeds back a CALL connection acknowledgement (CALL connection ACK) message to the core network server, and the corresponding CALL connection is received.
And ending the process of establishing the audio/video return link between the core network server and the calling terminal.
The following gives the process of establishing an audio/video return link between the core network server and the called UE:
first, if the called terminal is a UE that is not connected to the network, the core network notifies the called UE through a Trunking Paging (Paging) message that a related call arrives.
And secondly, the called UE is matched with the network through a SERVICE REQUEST (SERVICE REQUEST) process to recover the air interface bearing and the signaling connection.
Thirdly, the core network server informs the called UE of the relevant information of the CALL through a CALL REQUEST message, and the relevant information carries media format information, and mainly comprises the following steps: call ID, Call Number, Call Type, Call Attribute, Call Priority, Audio Description (if the Call Type service contains Audio media), Video Description (if the Call Type service contains Video media).
Step four, the called UE informs the core network that the local UE has received the CALL REQUEST carrying media format information through a CALL CONFIRMED (CALL CONFIRMED) message, which mainly comprises: call ID, Audio Description (if the Call Type service contains Audio media), Video Description (if the Call Type service contains Video media).
And fifthly, the network is matched with the called UE to establish corresponding special bearing.
And sixthly, after the called UE is off-hook, the core network server is informed through CALL CONNECT.
And seventhly, the core network server informs the calling UE through CALL CONNECT, the called party is off-hook, and data transmission can be carried out to the called party.
And step eight, the core network server feeds back a CALL CONNECT ACK to the called UE, and feeds back that the core network has received the CALCONNECT.
And ending the process of establishing the audio/video return link between the core network server and the called UE.
The following gives the procedure for establishing an audio/video return link between the core network server and the called DC:
in the first step, a core network server sends an INVITE message to inform a dispatching desk of the relevant information of the call.
And secondly, the dispatching desk sends a 100TRYING message to the core network server.
And step three, the dispatching desk is off-hook and sends a 180RINGING message to the core network server.
And fourthly, the dispatching desk sends SIP (200OK) information to the core network server and carries the media information.
And ending the process of establishing the audio/video return link between the core network server and the called DC.
The audio and video return adopts network decision, call proceeding, called side call request and call confirm without time sequence relation, namely, establishing audio and video return link with calling terminal and called terminal.
Example two
Referring to fig. 2, fig. 2 is a schematic diagram of a process of a calling terminal initiating an audio/video backhaul link release in the second embodiment of the present application. The method comprises the following specific steps:
Step 202, when the audio/video return link with the called terminal is released, sending a return release result indication to the calling terminal to notify the calling terminal that the audio/video return link with the called terminal is released.
When the calling terminal initiates a release request, the core network server, the calling terminal, the called DC and the called UE can be released simultaneously, namely, the three have no sequential time sequence relation.
For the calling terminal, the release process is as follows:
in the first step, a calling terminal initiates a call release request.
And secondly, the core network server sends a call release response to the calling terminal.
And thirdly, carrying out special bearer release between the core network server and the calling terminal.
For the called UE, the release procedure is as follows:
in the first step, a calling terminal initiates a call release request.
And step two, the core network server sends a call release request to the called UE.
And step three, the called UE sends a call release response to the core network server.
And fourthly, the core network server and the called UE carry out special bearer release.
For the called DC, the release procedure is as follows:
first, a called terminal initiates a call release request.
In a second step, the core network server sends a BYE message to the called DC.
Third, the called DC sends a 200OK message to the core network.
Referring to fig. 3, fig. 3 is a schematic diagram of a process of a called terminal initiating an audio/video backhaul link release in the second embodiment of the present application. The method comprises the following specific steps:
When a call release request sent by a called terminal is received, if only the called terminal is determined in the current called terminal, audio and video return link release is carried out with a calling terminal.
When the calling terminal initiates the release, all the related services including the related video scheduling services are released.
The called terminal actively initiates a release process, only called resources are released; services of the calling party and other called parties still exist; if only one called party exists, the method is equivalent to backhaul service release.
EXAMPLE III
Referring to fig. 4, fig. 4 is a schematic flow chart of a newly added called terminal in the third embodiment of the present application. The method comprises the following specific steps:
Step 402, when the audio/video return link establishment with the called terminal is completed, a return establishment result indication is sent to the calling terminal to inform the calling terminal that the audio/video return link between the calling terminal and the called terminal is established.
Taking the example of adding a called UE and a called DC at the same time, the process of adding a called terminal is described as follows:
the first step is that the calling UE informs a core network server of needing to newly add an audio/video to return to a called terminal through an NAS message ReBackInd, and the method mainly comprises the following steps: call Type, calljd, operation Type (added Called), and Called Number (which may carry multiple), where two are carried as an example, one for the Called UE and one for the Called DC.
And step two, the core network server simultaneously initiates a return called UE establishment flow and a return called DC establishment flow, and the subsequent core network server returns the called terminal establishment result to the calling terminal.
Referring to fig. 5, fig. 5 is a schematic flowchart illustrating a called terminal stopping process in the third embodiment of the present application. The method comprises the following specific steps:
Step 502, when the audio/video return link with the called terminal is released, sending a return release result indication to the calling terminal to notify the calling terminal that the audio/video return link with the called terminal is released.
Taking the example of adding a called UE and a called DC at the same time, the process of adding a called terminal is described as follows:
firstly, a calling terminal informs a network of needing to delete audio and video to return to a called terminal through an NAS message ReBackInd, and the method mainly comprises the following steps: call Type, calledd, operation Type (delete Called), and callnumber (which can carry multiple), and this embodiment takes the callnumber carrying one DC as an example.
And secondly, the core network server initiates a corresponding called DC return release flow, and the subsequent core network server returns a called establishment result to the calling party.
Table 3 shows the content included in the backhaul indication message (rebakind) for the calling terminal to initiate adding or deleting the called terminal in the embodiment of the present application. In concrete implementation, the message may be a message sent by NAS, with the contents shown in table 3.
| Cell | Means of |
| Call ID | Call identification |
| Calling Number | Calling party |
| Called Number | Is called party |
| CalledOpt | Called operation state (adding, deleting) |
TABLE 3
Example four
Referring to fig. 6, fig. 6 is a schematic view illustrating a flow of audio-video speaking right application in the fourth embodiment of the present application. The method comprises the following specific steps:
The following describes the talk right request process in detail by taking the terminal initiating the talk right request as the UE:
first step, called UE informs the network of the need of the calling terminal through NAS message ReBackFloorld
End-to-end conversation, the message mainly comprises: CalledId, talk burst operation type (apply for talk burst).
And step two, the core network judges whether a speaking right terminal exists at present, if so, the core network rejects, and if not, the core network agrees to the called UE. And informing the called speaking right application result through NAS information ReBackFloorResultInd. The message mainly comprises: CalledId, type of session operation (applying session), operation result.
Thirdly, if the call right state is updated, notifying all the called UE and the calling terminal of the change of the call right state through NAS information ReBackFloorInfo; if the talk right state updating exists, other called DCs are notified through SIP MESSAGE MESSAGE.
The called DC applies for the right to speak, similar to the called UE procedure, but done through SIP messages, which is not illustrated here.
In this embodiment, even if the called terminal cannot turn on the video, it is sufficient to ensure that the audio is established as successfully as possible.
EXAMPLE five
Referring to fig. 7, fig. 7 is a schematic view illustrating a release process of the audio-video session right in the fifth embodiment of the present application. The method comprises the following specific steps:
The following describes the talk burst release procedure initiated by the called UE and the called DC, respectively:
the procedure for releasing the talk right of the called UE is as follows:
step one, a called UE informs a core network server of needing to release the talk right through an NAS message ReBackFloorInd, and the method mainly comprises the following steps: CalledId, talk burst operation type (release talk burst).
And secondly, the core network server informs the called talk right release result through NAS information ReBackFloorResultInd. The message mainly comprises: CalledId, talk burst operation type (release talk burst), operation result.
Thirdly, if the speech right state is updated, notifying all the called UE and the calling terminal of speech right change through an NAS message ReBackFloorInfo message; if the talk right state updating exists, other called DCs are notified through SIP MESSAGE MESSAGE.
Table 4 shows contents included in a speech right release message sent by the called terminal when the audio/video speech right is released in the embodiment of the present application. The contents included in table 5 may be carried when the corresponding message is transmitted.
TABLE 4
Table 5 shows contents included in a message (rebakfoor result ind) notifying a called floor release result in the embodiment of the present application. The contents included in table 5 may be carried when the corresponding message is transmitted.
TABLE 5
Table 6 shows contents included in a message for notifying a calling terminal and a called UE of a change of speech right (rebakfortinfo) in the embodiment of the present application. The content contained in table 6 may be carried when the corresponding message is transmitted.
TABLE 6
Table 7 shows contents included in a message notifying a calling terminal and a called DC talk right change (Messge) in the embodiment of the present application. The content included in table 7 may be carried when the corresponding message is transmitted.
| Cell | Means of |
| Call ID | Call identification |
| Calling Number | Calling party |
| Called Number | Is called party |
| FloorUe Number | Speaking right UE number |
| FloorStat | Speaking right operation state (distribution, release) |
TABLE 7
The procedure for called DC floor release is as follows:
step one, the called DC informs the core network server of the need of releasing the talk right through the SIP MESSAGE, which mainly includes: CalledId, talk burst operation type (release talk burst).
And secondly, the core network server informs the called party of the call right release result through the SIP message 200 OK. The message mainly comprises: CalledId, talk burst operation type (release talk burst), operation result.
Thirdly, if the speech right state is updated, the core network server informs all the called and calling parties of the speech right change through NAS information ReBackFloorInfo; other called DCs are notified via SIP MESSAGE.
To sum up, when the calling terminal initiates a request for establishing an audio/video return link, the core network side server simultaneously performs an audio/video return link establishment procedure with the called terminal and the calling terminal, and feeds back an establishment result to the calling terminal when the audio/video return link is established with the called terminal. The technical scheme can quickly establish the audio and video return link.
The invention provides an audio and video return and related scheduling scheme, which enriches the system functions and increases the completeness of the system.
The method has clear and concise flow, can be realized by only slightly modifying the existing B-Trunc flow and interface, is easy to understand and realize in design, is simple and applicable
The media negotiation process is simplified, and meanwhile, the time for establishing the backhaul related scheduling service resources is effectively reduced (the related resources are established when the backhaul is established).
The invention effectively improves the user experience, overcomes the functional defect of the cluster system in practical application, and greatly meets the application requirements of various industries.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for establishing an audio/video return link in a broadband trunking system is characterized by comprising the following steps:
when a cluster core network side server receives a call request message sent by a calling terminal, determining main media format information for establishing an audio/video return link according to media format information carried in the call request message;
respectively establishing audio and video return links with the calling terminal and the called terminal according to the determined main media format information; wherein, the called terminal includes: a called user terminal UE and/or a called dispatching desk DC;
when the audio/video return link with the called terminal is established, a return establishment result indication is sent to the calling terminal to inform the calling terminal that the audio/video return link with the called terminal is established.
2. The method of claim 1, further comprising:
when a call release request sent by a calling terminal is received, audio and video return links are respectively released with the calling terminal and a called terminal;
and when the audio/video return link with the called terminal is released, sending a return release result indication to the calling terminal to inform the calling terminal that the audio/video return link with the called terminal is released.
3. The method of claim 1, further comprising:
when a call release request sent by a called terminal is received, audio and video return link release is carried out with the called terminal;
and when the audio/video return link with the called terminal is released, sending a return release result indication to the calling terminal to inform the calling terminal that the audio/video return link with the called terminal is released.
4. The method of claim 3, further comprising:
when a call release request sent by a called terminal is received, if only the called terminal is determined in the current called terminal, audio and video return link release is carried out with a calling terminal.
5. The method of claim 1, further comprising:
when a return indication message of a newly added called terminal sent by a calling terminal is received, establishing an audio/video return link with the newly added called terminal;
when the audio/video return link with the called terminal is established, a return establishment result indication is sent to the calling terminal to inform the calling terminal that the audio/video return link with the called terminal is established.
6. The method of claim 1, further comprising:
when a return indication message for deleting the called terminal sent by the calling terminal is received, audio and video return link release is carried out between the return indication message and the called terminal to be deleted;
and when the audio/video return link with the called terminal is released, sending a return release result indication to the calling terminal to inform the calling terminal that the audio/video return link with the called terminal is released.
7. The method of claim 1, further comprising:
when receiving a request message which is sent by a called terminal and needs to communicate with a calling terminal, determining whether a terminal which is in the right of speaking exists at present, and if so, sending a rejection message to the called terminal; otherwise, sending an agreement message to the called terminal; and updating the speaking right state and informing the calling terminal and other called terminals of the updated speaking right state.
8. The method of claim 1, further comprising:
when receiving a talk right release message sent by a called terminal, carrying out talk right release aiming at the called terminal and sending a talk right release result message of the called terminal to the called terminal;
and if the current speaking right state is updated, informing the calling terminal and the called terminal of the updated speaking right state.
9. The method according to any one of claims 1 to 8,
the Number of the Called Number in the call request message sent by the calling terminal is at least one.
10. The method according to any one of claims 1 to 8,
when the called terminal is called UE, the message transmitted and received with the called terminal is a message based on network attached storage NAS protocol; when the called terminal is the called DC, the messages transceived with the called terminal are messages based on the session initiation SIP protocol.
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| CN102843650B (en) * | 2011-06-21 | 2015-07-15 | 中国普天信息产业股份有限公司 | Method for achieving video scheduling |
| US9444752B2 (en) * | 2013-07-12 | 2016-09-13 | Seven Networks, Llc | Distributed caching systems with configurable extended caching optimization |
| US20160183113A1 (en) * | 2014-12-23 | 2016-06-23 | Qualcomm Incorporated | Efficient pairwise ranging to nodes in a large cluster |
| CN106714113B (en) * | 2015-11-12 | 2020-04-21 | 成都鼎桥通信技术有限公司 | Broadband multimedia trunking system and communication method |
| CN106604405B (en) * | 2016-04-28 | 2021-11-19 | 纵横非凡(北京)科技有限公司 | Broadband cluster wireless transmission method and system |
| CN106412847A (en) * | 2016-08-31 | 2017-02-15 | 国家电网公司客户服务中心南方分中心 | Power LTE (Long Term Evolution) wireless multi-service hosted network communication system architecture method |
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