CN104780518A - Terminal equipment of time division-long term evolution (TD-LTE) emergency voice communication system - Google Patents
Terminal equipment of time division-long term evolution (TD-LTE) emergency voice communication system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/90—Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
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Abstract
The invention provides terminal equipment of a time division-long term evolution (TD-LTE) emergency voice communication system. The terminal equipment comprises a display control module, a TD-LTE transmission module, a voice module, a battery management module and a Big Dipper positioning module. The display control module processes, displays and controls voice and information interaction. The TD-LTE transmission module is connected with a monitoring and command center through a base station and a TD-LTE core network and performs internet protocol (IP) data communication. The Big Dipper positioning module is used for acquiring position information of the emergency voice communication system. The battery management module is used for providing power for the whole emergency voice communication system. The terminal equipment is based on a TD-LTE technology, has the characteristics of high rate, small time delay, good stability, simple operation and so on, and is suitable for rapidly transmitting reliable information for occasions like emergency rescue in emergencies, rescue and relief work, law enforcement of public security and so on in real time.
Description
Technical field
The present invention relates to wireless communication technology field, relate to mobile communication terminal, especially a kind of TD-LTE emergency communication system voice terminal device.
Background technology
Natural calamity in recent years, Accident of Large-scale, emergencies in public safety frequently occurs, and emergency communication is also more and more important.In order to command scheduling effectively, efficient field rescue and disposal, need to keep the communication between command centre's real time communication in the site of the accident and a distant place and Field Force.Because a lot of sites of the accident circumstance complication is changeable, be difficult to use larger communication equipment, need portable reliable communicator to carry out round-the-clock real time communication more.
TD-LTE is the 4G standard being dominated research and development by China, and along with each telecom operators are to the application deployment of 4G network, China will progressively build up perfect TD-LTE broadband network communication system.Compared with 3G, TD-LTE has more technical advantage, TD-LTE provides wireless communication speeds quickly, can download with the speed of 100Mbps, the speed of 50Mbps is uploaded, and than dialling up on the telephone fast 2000 times, and reduces cordless communication network time delay, can realize high quality communication, therefore efficiency supports the real time communication of video, voice, image and text message.TD-LTE technology has QoS and ensures, ensure that the service quality of real time business, improves the reliability of emergency communication quality.
Following Patents document is found through retrieval:
A kind of portable emergency disaster relief mobile communications device (CN 103945569 A), comprise case, display device, CDMA core net module, power management module, ARM processing module, voice module, FM FM module, Anneta module, communication interface modules, CDMA core net module, power management module, ARM processing module, FM FM module is arranged in case, display device, Anneta module, communication interface modules is arranged on outside case, power management module and CDMA core net module, ARM processing module is electrically connected, CDMA core net module is electrically connected with Anneta module.Display device is arranged on the first surface of case, case with opposing second of first surface on be provided with roller, retractable handle, braces card, roller is near the bottom surface of case, and retractable handle is near the end face of case, and braces card is arranged on the corner of second.But what this device adopted is CDMA technology, owing to using identical carrier frequency, permitted a multi-user shared channel, strong signal has obvious inhibitory action to weak signal, thus produce " far away--near " effect, affect user's communication, simultaneously in the Consumer's Experience such as message transmission rate, service delay all not as good as TD-LTE technology, and this device volume is comparatively large, is difficult to hand-held, inconvenience is single carries.
Point-to-point call method and equipment (CN 103096259 A) in a kind of TD-LTE digital cluster system.The method comprises the message for triggering point to point call that LTE core network receives calling UE transmission, carries the identification information of called UE in the described message for triggering point to point call; LTE core network obtains the business state information of described called UE in digital cluster system according to the identification information of described called UE, and after the RRC connection establishment determining continuation point to point call and described called UE according to described business state information, continue described calling UE and called UE; LTE core network, after continue calling UE and called UE, is set up voice bearer with described calling UE and called UE respectively and carries out calling and called call business.The embodiment of the present invention does not need extra introducing CS territory or IMS domain in existing TD-LTE system when point to point call, can reduce costs and complexity.But the method and functions of the equipments single, there is no group calling, the function of broadcast & call, the needs of complex task cannot be tackled.
Larger difference is had by the technology contents and present patent application of analyzing above patent application.
Summary of the invention
Natural calamity, Accident of Large-scale rescue cannot be met, the requirement that the site disposal personnel such as emergencies in public safety are convenient for carrying and use for mobile communication terminal in above prior art; Existing WIFI, 3G technology are difficult to realize voice, the deficiency of the technical barrier of the multimedia messages remote wireless transmissions such as information, one is the object of the present invention is to provide to be easy to carry, and energy quick position, achieve the method for information realtime interactive communication in complex environment, technical scheme of the present invention is as follows: a kind of TD-LTE meets an urgent need the terminal equipment of voice communication system, comprise display control module, communications module, voice module, battery management module, it also comprises Big Dipper locating module, and described communications module is TD-LTE transport module;
Described voice module gathers speech data and is transferred to display control module; Described display control module processes, shows and operates control to voice, interactive information; Described TD-LTE transport module to be connected with control and command center by base station, TD-LTE core network and to carry out IP data communications; Described Big Dipper locating module is for obtaining the positional information of terminal equipment; Described battery management module is used for powering to whole emergent voice communication terminal equipment; In described voice module, voice collecting, playback realize by utilizing ALSA speech processes framework; Described display control module, mainly comprise speech processing module and signaling processing module, speech processing module comprises speech coding module, voice sending module, speech reception module and audio playback module, speech coding, decoding is realized by the G.711 audio coder & decoder (codec) that utilizes Davinci technology platform to provide, and voice send, receive transmission by utilizing RTP host-host protocol to carry out speech data; Described signaling processing module adopts SIP signaling control protocol to realize signaling process, realize main exhale with by foundation, the call denial of exhaling and call out and disconnect signaling; Described TD-LTE transport module comprises TD-LTE Analog Baseband, TD-LTE baseband processor, TD-LTE Analog Baseband, TD-LTE radio circuit; Described Big Dipper locating module adopts the UM220-IIIB Big Dipper, GPS dual system positioning chip, obtain the latitude and longitude coordinates location geographic information of emergency communication terminal, be transferred to display control module again, the geographical location information of this terminal is presented at display screen, or sends to Surveillance center and other interconnected emergency communication terminal by LTE network.
Further, the ALSA speech processes framework of described audio processing modules comprises step:
(1) initialization audio frequency apparatus, obtains and analyzing audio device attribute, calls respective function and arrange audio frequency apparatus parameter, audio data format, audio data rate, the voice data number of channel;
(2) audio frequency apparatus function is opened, this function opens PCM hardware device respectively with collection or playback mode, under making sound card be operated in collection, playback state simultaneously, then call and audio frequency function is set, and audio frequency parameter is passed to audio frequency parameter function is set;
(3) sound card running parameter is set, collection is set on the one hand.Under playback state, the acquisition parameter of sound card, comprises audio format.Speed and the number of channel; Under arranging sound DAQ, playback state on the other hand, corresponding running parameter, comprises periodicity, cycle size, access module;
(4) audio data collecting, is read in user cache by voice data from hardware cache;
(5) audio data playback, is read into voice data in hardware cache from user cache.
Further, there are two kinds of operating states in described terminal installation, holding state and in busy condition, and holding state refers to that terminal installation does not carry out any voice scheduling business, and signaling port is monitored in circulation.Refer to that terminal installation is carrying out a certain voice scheduling business in busy condition, himself also may be that master exhales or exhaled, voice scheduling business comprises single call service, business is exhaled in group-calling service, broadcast, single call service refers to that master exhales being called out, it is man-to-man full-duplex communication mode, group-calling service refers to that main exhaling is called out other members in group, it is the half-duplex operation mode of one-to-many, broadcast business of exhaling refers to that in group, an arbitrary member calls out other members, is the simplex mode of one-to-many.
Advantage of the present invention and beneficial effect as follows:
1, described TD-LTE terminal installation can access commercial TD-LTE network, can realize the remote radio communication of nationwide, and Command center and remote scene are established information interaction, achieves remote command scheduling.
2, described TD-LTE terminal installation can access the dedicated networks such as TD-LTE emergency communication system, and the difficult problem that under solving complex environment, fast quick-recovery communicates with foundation, reliably communicates to connect effectively for field operation and remote command provide.
3, the TD-LTE technology that described TD-LTE terminal installation uses comparatively before the technology such as 3G in transmission rate with all improve a lot qualitatively, the transmission of the multimedia messagess such as voice reliably can be provided in real time for emergency communication.
4, described TD-LTE terminal installation is easy to carry, easy to use, is applicable to the places such as rescue and relief work, anti-terrorism public security, mining area operation.
Accompanying drawing explanation
Fig. 1 is practical scene operating diagram of the present invention;
Fig. 2 is structural principle block diagram of the present invention;
Fig. 3 is display control module theory diagram of the present invention;
Fig. 4 is TD-LTE transport module schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
Core technology of the present invention is, based on the ARM+DSP dual-core architecture of TI DM3730 processor, by voice module and display control module, voice gathered, store, encode, decode, playback, also have Signalling exchange, comprise individual calling, group calling, group busy, priority arranges and the signaling process of forced interposing and forced releasing realizes.The low delay transmission of two-forty is realized by TD-LTE transport module.This device is easy to carry, simple operation, is applied to down-hole or underground mine operation, the emergency management and rescue disaster relief, the scenes such as public security, anti-terrorism stability maintenance.
Figure 1 show practical scene operating diagram of the present invention; Surveillance center utilizes communication network, communicates with terminal, utilizes communication network to carry out interconnected communication between terminal.Realize the call of convenient, efficient real-time voice by voice communication terminal, field scene can be fed back to Surveillance center and realize the object of remote command monitoring and the object of the mutual collaboration communication of field operation.
Figure 2 illustrate structural principle block diagram of the present invention, specifically comprise: voice module, display control module, TD-LTE transport module, Big Dipper locating module, battery management module.
Working method of the present invention is: gather speech data by voice module, then the speech data of collection is sent to display control module, after the process of primary voice data compressed encoding, utilize TD-LTE module to pass and connect with Surveillance center or other terminal, carry out data and transmit with mutual.
In described voice module, voice collecting, playback realize by utilizing ALSA speech processes framework.ALSA speech processes framework provides the support of audio frequency and MIDI on (SuSE) Linux OS.ALSA speech processes frame work flow process mainly comprises:
(1) initialization audio frequency apparatus, obtains and analytical equipment attribute, calls respective function and arrange the other parameter of equipment, audio data format, audio data rate, the voice data number of channel.
(2) audio frequency apparatus function is opened, this function opens PCM hardware device respectively with collection or playback mode, under making sound card be operated in collection, playback state simultaneously, then call and audio frequency function is set, and audio frequency parameter is passed to audio frequency parameter function is set.
(3) sound card running parameter is set, collection is set on the one hand.Under playback state, the acquisition parameter of sound card, comprises audio format.Speed and the number of channel; Under arranging sound DAQ, playback state on the other hand, corresponding running parameter, comprises periodicity, cycle size, access module.
(4) audio data collecting, is read into voice data in user cache from hardware cache.
(5) audio data playback, is read into voice data in hardware cache from user cache.
Structure mainly comprises TFT touch display, the storage module comprising NAND Flash and SDRAM, USB HOST, USB OTG and expansion I/O and audio frequency I/O external interface, TI DM3730 low-power-consumption embedded processor.Wherein TI DM3730 low-power-consumption embedded processor is that 1GHz (supports 300 simultaneously by dominant frequency, 600 and 800MHz) ARM Cortex-A8 kernel and dominant frequency be that 800MHz (supports 250 simultaneously, 520 and 660MHz) TMS320C64x+DSP Core two parts group, and be integrated with 3D graphic process unit and video accelerator, wherein DSP has efficient digital signal processing capability, ARM has powerful peripheral equipment management ability, ensure that the speed of the continuity that voice channel is mutual and handoff response.The effective filtering High-frequency Interference of DSP digital filtering and background noise, the voice quality of assured forwarding.
Display control module will carry out speech processes thread and signaling processing threads.Speech processes thread comprises speech coding thread, and voice send thread, phonetic incepting thread and audio playback thread.Speech coding, decoding is realized by the G.711 audio coder & decoder (codec) that utilizes Davinci technology platform to provide, and voice send, receive transmission by utilizing RTP host-host protocol to carry out speech data.
Upper described signaling handling process, adopts SIP signaling control protocol to realize signaling process.By utilize SIP signaling control protocol realize main exhale with by foundation, the call denial of exhaling and call out and disconnect signaling process.
There are two kinds of operating states in this terminal installation, holding state and in busy condition, and holding state refers to that terminal installation does not carry out any voice scheduling business, and signaling port is monitored in circulation.Referring to that terminal installation is carrying out a certain voice scheduling business in busy condition, himself also may be that master exhales or exhaled.Voice scheduling business comprises single call service, business is exhaled in group-calling service, broadcast.Single call service refers to main exhaling being called out, and is man-to-man full-duplex communication mode.Group-calling service refers to that main exhaling is called out other members in group, is the half-duplex operation mode of one-to-many.Broadcast business of exhaling refers to that in group, an arbitrary member calls out other members, is the simplex mode of one-to-many.
First each terminal is registered on the server, and registration content comprises the information such as priority, IP number of terminal.To individual calling and group-calling service, arranged by priority, when called party have received call request, first detect the operating state of self, if holding state, then receipt of call request establishing call connection, if in busy condition, then detects the priority of the main side of exhaling whether higher than the priority of self, if, then stop current speech business, and establish call connection with the main side of exhaling, otherwise send call denial to the master side of exhaling
Master exhales terminal A, is exhaled terminal B, arranges traffic flag position flag0, flag1, and flag0 is that voice send flag bit, and flag1 is phonetic incepting flag bit, works as flag0=1, during flag1=1, namely carries out transmission and the reception of voice simultaneously, i.e. full double end communication mode.
(1) above-mentioned single call service flow process: single call service is full-duplex communication mode, therefore master exhales A and is exhaled flag bit flag0, flag1 of B to be set to 1.Main exhale A session establishment flow process, the main A that exhales is to when being exhaled B initiation session, and first send INVITE to B, if B returns ANSWER message to A, then A sends ACK message again, now session establishment, arranges flag bit flag0=1, flag1=1; If B returns CANCEL to A, then A sends ACK message again, and session can not be set up; If through waiting for that B does not return any message, then session also can not be set up.
Exhaled B session establishment flow process, when B receive A be sent to INVITE time, if now B is in holding state, then send ANSWER message to A, B receives the ACK message that A returns, then now session establishment, arranges flag bit flag0=1, flag1=1; If now B is in busy condition, then judge according to the priority of A and B, if the priority of A is greater than the priority of B, then B stops current business, sets up the session with A, if the priority of A is less than the priority of B, then send CANCEL to A, A returns ACK message, and session can not be set up; If through waiting for that B is for returning any message, session can not be set up.
Individual calling session release is based upon main when exhaling A and exhaled the built vertical session connection of B and carry out individual calling full-duplex communication, and normal releasing session connects flow process.No matter exhale A main or exhaled B to initiate release flow process, flowchart process is all the same, assuming that discharged by A initiation session, A sends BYE message to B, and the ACK message that B returns if receive, then session discharges, and arranges flag bit flag0=0, flag1=0.For being exhaled B, if receive the message of the BYE that A sends, then send ACK message to A, session discharges, and arranges flag bit flag0=0, flag1=0;
(2) above-mentioned group-calling service flow process: main exhale A, by exhale form for other few members exhaled group, be defined as B group, traffic flag position flag0, flag1, group-calling service is half-duplex operation mode, therefore as the main flag bit flag0=1 exhaling A, during flag1=0.Exhaled the flag bit flag0=0 of B group membership, flag=1, as the main flag bit flag0=0 exhaling A, during flag1=1, exhaled the flag bit flag0=1 of B group membership, flag1=0.Group calling session establishment flow process: master exhales A session establishment, first INVITER message is sent to each member of B group, if receive the ANSWER message that B group membership returns, confirm the member returning ANSWER message, then ACK is sent to corresponding group member, now session establishment, arranges flag bit flag0=1, flag1=0; If receive the CANCEL that B group membership returns, confirm the B group membership sending message, then send ACK to corresponding group member, now session is built and can not be set up; If through waiting for, for receiving the return messages of member in B group, then session can not be set up.
Exhaled B group membership session establishment, for B group membership, when receiving the call request that A sends, concerning B group membership, namely setting up individual calling and connecting, flow process is as exhaled session establishment flow process in single call service, just now flag bit is flag0=0, flag1=1.
Group calling session discharges, when after the A initiation session releasing request of initiating group-calling service, in A and B group, each member stops session successively, group calling session release flow process: main when exhaling A to initiate release, sends each member in BYE message to B group, the ACK message that B group membership returns if receive, determine corresponding group membership, then the session of corresponding group membership is released, and arranges flag bit lag0=0, flag1=0.For B group membership, if receive BYE message, then send ACK message to A, now session is released, and arranges flag bit flag0=0, flag1=0.
When B group is at certain member's initiation session releasing request, A receive session releasing request and with its termination session, but A and B organizes other members still keeps session connection, and now B group member and the session of A discharges session in flow process and single call service, and to discharge flow process the same.
(3) above-mentioned broadcast & call operation flow: master exhales A, is exhaled as members all except A, is defined as C group.Traffic flag position flag0, flag1, broadcast & call business is simplex mode, main exhales the flag bit flag0 of A to be set to 1, flag1 is set to that flag bit flag0 in 0, C group is set to 0, flag1 is set to 1.Broadcast & call service conversation is set up, main exhale A session establishment flow process and in group-calling service, lead that to exhale the session establishment of A to be connected similar, but in group-calling service, master exhales A that session establishment request is sent to each group member, and all end member under master exhales A that session establishment request is sent to all emergency environmentals in broadcast & call business, i.e. all members in C group, now session is simplex.
Exhaled the session establishment of certain member in C group.Exhaled in the connection of the session establishment of certain member in C group and single call service similar by the session connection of exhaling, but because broadcast & call business is simplex mode, exhaled each member in C group only to need to carry out phonetic incepting decoding playback, and do not need the capturing and coding carrying out voice to send.
Broadcast & call service conversation discharges.When master exhales A initiation session to discharge, it is the same that its flow process and the session that in group-calling service, master exhales A to initiate discharge flow process.When being exhaled in C group the release of certain member's initiation session, its flow process is with to be exhaled session that in B group, certain member initiates to discharge flow process in group-calling service the same.
(4) above-mentioned speech processes flow process, according to the signaling control flow of different phonetic dispatching services, have different settings to the speech processes in terminal, speech processes flow process processes according to the flag bit returned after Signalling exchange, session IP or IP group.Handling process is: if flag0=1, then determine type of service and arrange destination, then carries out voice collecting coding thread, then carries out voice transmission thread, afterwards cycle criterion flag bit flag0; If flag0=0, then continue cycle criterion flag bit flag0.If flag1=1, then determine type of service, then carry out phonetic incepting thread, then carry out tone decoding playback thread, cycle criterion flag bit flag1 afterwards; If flag1=0, then continue cycle criterion flag bit flag1.
Fig. 4 illustrate TD-LTE transport module of the present invention, mainly comprise: TD-LTE baseband processor, TD-LTE Analog Baseband, TD-LTE radio circuit etc.This module is connected with the USB HOST interface of display control module by USB2.0 interface, after TD-LTE transport module is connected with display control module, in order to make it normally work under LINUX operating system, needing to carry out serial ports patten transformation, being namely identified with modern pattern.By TD-LTE transport module, terminal can be accessed by LTE network, thus realizes radio communication
Described Big Dipper locating module, adopts the UM220-III Big Dipper, GPS dual system positioning chip module, this module integration degree is high, power is low, highly sensitive.The position geography information such as the latitude and longitude coordinates of emergency communication terminal are obtained by this module, be transferred to display control module again, the geographical location information of this terminal display screen can be presented at, also Surveillance center and other interconnected emergency communication terminal can be sent to by LTE network.
Described power management module, this module in charge powers to the modules of whole emergency communication terminal, adopts the detachable rechargeable battery changed.
The invention solves 3G network for process high data rate, packet transmission, reduce postpone, wide area covers and the problem requiring to exist certain inferior position such as backward compatible, and solve and in case of emergency set up communication fast, emergency field conditions is fed back to command centre rapidly.Volume of the present invention is little easy to carry, simple to operate, can also the speech business realizing individual calling, group calling and broadcast & call of fast and stable, responds fast under being conducive to case of emergency.Various communications peripheral can access by interface accessory provided by the invention easily fast.
These embodiments are interpreted as only being not used in for illustration of the present invention limiting the scope of the invention above.After the content of reading record of the present invention, technical staff can make various changes or modifications the present invention, and these equivalence changes and modification fall into the scope of the claims in the present invention equally.
Claims (3)
1. a TD-LTE meets an urgent need the terminal equipment of voice communication system, comprise display control module, communications module, voice module, battery management module, it is characterized in that: also comprise Big Dipper locating module, and described communications module is TD-LTE transport module;
Described voice module gathers speech data and is transferred to display control module; Described display control module processes, shows and operates control to voice, interactive information; Described TD-LTE transport module to be connected with control and command center by base station, TD-LTE core network and to carry out IP data communications; Described Big Dipper locating module is for obtaining the positional information of terminal equipment; Described battery management module is used for powering to whole emergent voice communication terminal equipment; In described voice module, voice collecting, playback realize by utilizing ALSA speech processes framework; Described display control module, mainly comprise speech processing module and signaling processing module, speech processing module comprises speech coding module, voice sending module, speech reception module and audio playback module, speech coding, decoding is realized by the G.711 audio coder & decoder (codec) that utilizes Davinci technology platform to provide, and voice send, receive transmission by utilizing RTP host-host protocol to carry out speech data; Described signaling processing module adopts SIP signaling control protocol to realize signaling process, realize main exhale with by foundation, the call denial of exhaling and call out and disconnect signaling; Described TD-LTE transport module comprises TD-LTE Analog Baseband, TD-LTE baseband processor, TD-LTE Analog Baseband, TD-LTE radio circuit; Described Big Dipper locating module adopts the UM220-IIIB Big Dipper, GPS dual system positioning chip, obtain the latitude and longitude coordinates location geographic information of emergency communication terminal, be transferred to display control module again, the geographical location information of this terminal is presented at display screen, or sends to Surveillance center and other interconnected emergency communication terminal by LTE network.
2. TD-LTE according to claim 1 meets an urgent need the terminal equipment of voice communication system, it is characterized in that: the ALSA speech processes framework of described audio processing modules comprises step:
(1) initialization audio frequency apparatus, obtains and analyzing audio device attribute, calls respective function and arrange audio frequency apparatus parameter, audio data format, audio data rate, the voice data number of channel;
(2) audio frequency apparatus function is opened, this function opens PCM hardware device respectively with collection or playback mode, under making sound card be operated in collection, playback state simultaneously, then call and audio frequency function is set, and audio frequency parameter is passed to audio frequency parameter function is set;
(3) sound card running parameter is set, collection is set on the one hand.Under playback state, the acquisition parameter of sound card, comprises audio format.Speed and the number of channel; Under arranging sound DAQ, playback state on the other hand, corresponding running parameter, comprises periodicity, cycle size, access module;
(4) audio data collecting, is read in user cache by voice data from hardware cache;
(5) audio data playback, is read into voice data in hardware cache from user cache.
3. TD-LTE according to claim 1 meets an urgent need the terminal equipment of voice communication system, it is characterized in that: described terminal installation exists two kinds of operating states, holding state and in busy condition, holding state refers to that terminal installation does not carry out any voice scheduling business, and signaling port is monitored in circulation.Refer to that terminal installation is carrying out a certain voice scheduling business in busy condition, himself also may be that master exhales or exhaled, voice scheduling business comprises single call service, business is exhaled in group-calling service, broadcast, single call service refers to that master exhales being called out, it is man-to-man full-duplex communication mode, group-calling service refers to that main exhaling is called out other members in group, it is the half-duplex operation mode of one-to-many, broadcast business of exhaling refers to that in group, an arbitrary member calls out other members, is the simplex mode of one-to-many.
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| CN105338504A (en) * | 2015-09-29 | 2016-02-17 | 中国联合网络通信集团有限公司 | Emergency communication method and device |
| CN105472557A (en) * | 2015-12-02 | 2016-04-06 | 重庆邮电大学 | TD-LTE emergency communication terminal based on Beidou GPS dual-mode positioning, and monitoring command system |
| CN106304006A (en) * | 2016-09-14 | 2017-01-04 | 重庆邮电大学 | A kind of emergency communication system multi-functional terminal end |
| CN106412518A (en) * | 2016-10-20 | 2017-02-15 | 重庆邮电大学 | Wireless video transmission system based on TD-LTE emergency communication |
| CN106851657A (en) * | 2015-12-07 | 2017-06-13 | 大唐移动通信设备有限公司 | A kind of Emergency Communications Network dispositions method and base station |
| CN107566368A (en) * | 2017-09-04 | 2018-01-09 | 中国航空无线电电子研究所 | Voice communication system and its Application way for ground control's node |
| CN111342978A (en) * | 2018-12-19 | 2020-06-26 | 成都鼎桥通信技术有限公司 | Group calling method, device and equipment |
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| CN105338504A (en) * | 2015-09-29 | 2016-02-17 | 中国联合网络通信集团有限公司 | Emergency communication method and device |
| CN105472557A (en) * | 2015-12-02 | 2016-04-06 | 重庆邮电大学 | TD-LTE emergency communication terminal based on Beidou GPS dual-mode positioning, and monitoring command system |
| CN106851657A (en) * | 2015-12-07 | 2017-06-13 | 大唐移动通信设备有限公司 | A kind of Emergency Communications Network dispositions method and base station |
| CN106851657B (en) * | 2015-12-07 | 2019-12-06 | 大唐移动通信设备有限公司 | emergency communication network deployment method and base station |
| CN106304006A (en) * | 2016-09-14 | 2017-01-04 | 重庆邮电大学 | A kind of emergency communication system multi-functional terminal end |
| CN106412518A (en) * | 2016-10-20 | 2017-02-15 | 重庆邮电大学 | Wireless video transmission system based on TD-LTE emergency communication |
| CN107566368A (en) * | 2017-09-04 | 2018-01-09 | 中国航空无线电电子研究所 | Voice communication system and its Application way for ground control's node |
| CN107566368B (en) * | 2017-09-04 | 2020-10-27 | 中国航空无线电电子研究所 | Voice communication system for ground command node and utilization method thereof |
| CN111342978A (en) * | 2018-12-19 | 2020-06-26 | 成都鼎桥通信技术有限公司 | Group calling method, device and equipment |
| CN111342978B (en) * | 2018-12-19 | 2022-05-03 | 成都鼎桥通信技术有限公司 | Group calling method, device and equipment |
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