CN204350304U - Digital common-frequency broadcasting intercom system - Google Patents
Digital common-frequency broadcasting intercom system Download PDFInfo
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- CN204350304U CN204350304U CN201520046287.1U CN201520046287U CN204350304U CN 204350304 U CN204350304 U CN 204350304U CN 201520046287 U CN201520046287 U CN 201520046287U CN 204350304 U CN204350304 U CN 204350304U
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Abstract
The utility model discloses a kind of digital common-frequency broadcasting intercom system, comprise a control centre and two or more telepoint base station, and for link device that control centre is connected with telepoint base station signal, control centre comprises the node switch and Node Controller that adopt embedded hard switching technology, and webmaster terminal.Telepoint base station comprises with broadcasting channel controller, BTS channel machine and antenna feeder equipment.Its structure is according to DMR/PDT agreement, satellite time transfer simultaneous techniques is utilized to effectively eliminate the co-channel interference of overlapping coverage areas, the clear noiseless of voice conversation, ensure that common-frequency simulcasting and the large area seamless coverage of digital intecommunication system, achieve user's individual calling, group calling, generally call, urgent call, the functions such as short message transmission, can be widely used in the emergency communication fields such as People's Armed Police, public security, fire-fighting, people's air defense, forest fire protection, railway, highway.
Description
Technical field
The utility model relates to a kind of intercom system, particularly a kind of based under DMR/PDT agreement, digital intercom terminal can simultaneously intercommunication uses in wide area common-frequency simulcasting digital handset system, belongs to electronic communication technology field.
Background technology
In the past in digital intecommunication system, usually adopt single digital base stations to carry out the transmission work of communication signal, system ovelay range is little, and capacity is low, can not meet digital communication demand.When needs large area covers, is often networked in multiple base station, adopting alien frequencies working method composition alien frequencies with broadcasting net, expand to realize communication context, but it showing again following shortcoming simultaneously:
1, take many class frequencys resource, almost each base station will take a different set of frequency, cause radio spectrum resources luxus consumption;
2, because digital intercom terminal has mobility, it moves to another base station overlay area from a base station overlay area continually, to be difficult to technology to realize good in base station automatic roaming, to make troubles to actual use for alien frequencies with broadcasting.
As overcome above-mentioned shortcoming, the telepoint base station of multiple phase the Internet must use with a pair transmitting-receiving frequency, like this, both can reach the object of saving frequency resource, can easily realize again digital intercom terminal across base station automatic roaming.But in practice examining, this kind of mode can bring again many base stations to receive and the problem such as overlapping coverage areas co-channel interference, and specific explanations is described as follows simultaneously:
1, the receive frequency due to multiple telepoint base station is identical, when digital intercom terminal is in the calling of overlapping coverage areas, many base stations, multiple base station can receive signal simultaneously, if these signals are all transmitted to all base station transmitters, speech will be caused overlapping and serious distortion, therefore, head it off must arrange control centre and sentence choosing to upward signal, sentences to select a best path channels and just can be transmitted to each telepoint base station.
2, the data-signal of each telepoint base station is transmitted to from control centre, because link difference, when arriving each base station radio overlapping coverage areas, the difference of time delay, phase place, amplitude can be there is, cause BER excess, receiving intercom can not be correctly decoded, and causes audio discontinuity, modified tone.Therefore, equilibrium treatment must be carried out to each road signal, ensure that each road signal arrives the time delay of overlapping coverage areas, phase place, amplitude are consistent.
3, when many base stations use same frequency to launch, overlapping coverage areas can produce serious co-channel interference phenomenon, when causing the digital intercom terminal Received signal strength being in overlapping coverage areas, also cannot be able to decode because of BER excess, therefore solving problem of co-channel interference just needs first to ensure that the carrier frequency that multiple base station transmitter is launched is extremely stable.
So, propose feasible solution for above-mentioned explanation, just become the problem that the utility model is wanted to solve.
Summary of the invention
In view of the foregoing and not enough, the utility model aim to provide a kind of based under DMR/PDT agreement, common-frequency simulcasting intercommunication technology can be adopted in wide area to realize the digital intecommunication system of accurate and effective, the reliable intercommunication of digital intercom terminal, needs are used, the expanding digital intercommunication terminal scope of application with satisfied reality.
For achieving the above object, solve the overlapping coverage areas audio superposition, the distortion phenomenon that bring in common-frequency simulcasting scheme, and in overlapping coverage areas co-channel interference, problem that the error rate is high, the utility model have employed following technical scheme and solves:
A kind of digital common-frequency broadcasting intercom system, comprises a control centre and two or more telepoint base station, and for link device that control centre is connected with telepoint base station signal; Control centre comprises the node switch and Node Controller that adopt embedded hard switching technology, and webmaster terminal; Telepoint base station comprises with broadcasting channel controller, BTS channel machine and antenna feeder equipment; Node switch carries out the transmission of contact information by link device with broadcasting channel controller; What the information that Node Controller receives node switch carried out signal source according to error rate mode sentences choosing, and the best road signal obtained after sentencing choosing is transmitted to all telepoint base stations after equilibrium treatment; Webmaster terminal be responsible for whole system condition monitoring, fault warning display, long-range setting is carried out to system parameters; With the Signal transmissions broadcast channel controller and to be undertaken by BTS channel machine and antenna feeder equipment and extraneous mobile digital intercommunication terminal under MR/PDT agreement, and the node switch of link device and control centre is utilized to carry out information transmission.
Described same broadcasting in channel controller is provided with satellite synchronization module, and satellite synchronization module adopts the mode of triones navigation system and the backup of GPS navigation system double star carry out the reception of satellite time service system and provide pulse per second (PPS) as the time-base signal of high stable CF signal.
Described link device is the Hot Spare combination of in VHF/UHF wireless link, ethernet link and E1 link any two kinds.
The beneficial effects of the utility model comprise:
1, based under DMR or PDT normal protocol, adopt digital mode operation, expand the communication range of digital intercom terminal, achieve the individual calling between digital intercom terminal, group calling, generally call, urgent call and short message transmission function.
2, all telepoint base stations use identical transmitting-receiving frequency, effectively expand the activity extent of digital intercom, achieve the real-time information transmission of moving process in signal cover, save national frequency resource.
4, by Node Controller, choosing is sentenced to upward signal, the error rate of analytic signal data, a circuit-switched data signal minimum for the error rate is transmitted to all telepoint base stations, ensure that reliability and the validity of signal source.
5, by Node Controller, equilibrium treatment is carried out to descending each road signal, ensure that signal arrives the consistency of overlapping coverage areas, ensure that the reception of overlapping coverage areas.
6, Node Controller and node switch adopt embedded hard switching technology, compare the Softswitch technology adopting and run common operating system, have not easily deadlock, reboot time and are subject to the features such as computer virus attack soon, not.
7, by the Service of Timing of triones navigation system or GPS navigation system, calibration base station crystal oscillator frequency, ensure that the stability of Base Transmitter carrier frequency, simultaneously, also can the synchronism of effectively controls transfer and transmitting data, ensure the speech data Complete Synchronization of the signal overlap area of coverage, eliminate co-channel interference or the speech superposition phenomenon of overlapping coverage areas.
8, any two kinds of link combinations in link device employing ethernet link, E1 link and VHF/UHF wireless link, as Hot Spare, effectively reduce system failure rate, ensure system long-term stable operation under the support of arbitrary link.
Accompanying drawing explanation
Fig. 1 is structural representation sketch of the present utility model.
Fig. 2 is construction module schematic diagram of the present utility model.
Embodiment
Below for three telepoint base stations, by reference to the accompanying drawings 1, Fig. 2 is described in further detail the utility model:
Digital common-frequency broadcasting intercom system described in the utility model, comprises a control centre and three telepoint base stations, and for link device that control centre is connected with telepoint base station signal.Control centre is arranged in the machine room of Subscriber Unit, and three telepoint base stations are arranged on respectively in the different point of presences of reasonable plant-site selection.Each telepoint base station forms the covering of certain area, and the telepoint base station of three phase the Internets just can form the quorum sensing inhibitor of a larger area, for the digital intercom terminal in motion provides conveniently.Certainly, signal disturbing and superposition will be formed in the signal overlap district of three telepoint base stations, the signal in its region is selected and judges just to become certainty.
Telepoint base station comprises with broadcasting channel controller, BTS channel machine and antenna feeder equipment.With broadcast channel controller first detect mobile terminal send signal be analog signal or digital signal, then adaptively should be corresponding mode of operation, and utilize the node switch of link device and control centre to carry out the transmission of reception information, then, the signal transmission under DMR/PDT agreement is carried out by BTS channel machine and antenna feeder equipment and extraneous mobile digital intercommunication terminal.
Can not co-channel interference being produced between the multiple digital intercom terminals carrying out Signal transmissions for guaranteeing to adopt same frequency, being provided with corresponding satellite synchronization module with broadcasting in channel controller.Satellite synchronization module adopts the mode of triones navigation system and the backup of GPS navigation system double star to carry out the reception of satellite time transfer signal, unique and identical to guarantee each base station frequency time, simultaneously, with broadcasting channel controller according to the pps pulse per second signal in satellite time service system as frequency reference determination tranmitting frequency, thus the carrier frequency deviation making transmitter finally launch is less than 10Hz, effectively overcome the signal co-channel interference defect under same frequency transmission.
Control centre comprises node switch, Node Controller and webmaster terminal.What Node Controller carried out signal source according to error rate mode sentences choosing, and the best road signal obtained after sentencing choosing is transmitted to all telepoint base stations.
Node Controller and node switch adopt embedded hard switching technology, compare the Softswitch technology adopting and run common operating system, have not easily deadlock, reboot time and are less than for 2 seconds, are not subject to the features such as computer virus attack.
For guaranteeing the consistency of the data-signal arrival overlapping coverage areas that each BTS channel machine is launched, avoid because time delay, phase place, amplitude inconsistent and increase error rates of data, equalizing circuit is provided with in Node Controller, the equilibrium treatment of signal is carried out before each data-signal transmits, thus make the delay inequality of each circuit-switched data modulation signal in overlapping coverage areas, each base station not higher than 52uS, phase difference is not higher than 10 °, amplitude difference is not higher than 10%, ensure that Liao Ge road signal is completely overlapping after arriving overlapping coverage areas, eliminate the error rate of overlapping coverage areas, make digital intercom terminal can obtain good reception in overlapping coverage areas.
Webmaster terminal be responsible for whole system condition monitoring, fault warning display, long-range setting is carried out to system parameters.
For ensureing the transmitting of information between control centre and telepoint base station, in this example, link device is a kind of Hot Spare combination that ethernet link and VHF/UHF wireless link combine, so-called Hot Spare refers to: when the link failure used, system automatically can be selected another one link and be connected, thus communication process is carried out smoothly under effective, reliable environment.Certainly, link device also can be the Hot Spare combination of ethernet link and E1 link, or the Hot Spare combination of E1 link and VHF/UHF wireless link.
In use procedure, when the digital intercom terminal being arranged in signal overlap district initiates audio call, two telepoint base stations closed on receive call signal, the corresponding same signal broadcasting the transmission of channel controller detection digital intercom terminal is analog signal or digital signal, then adaptively should be corresponding mode of operation, and transfer signals to control centre respectively by ethernet link.After the Node Controller of control centre receives by node switch the same signal source signal that these two telepoint base stations send, analyze each road signal error rate, a road signal minimum for the error rate is sentenced and elects, then after equilibrium treatment, be forwarded back to three telepoint base stations by ethernet link.After three telepoint base stations receive the signal of control centre's forwarding respectively, according to the satellite time service system information of triones navigation system or GPS navigation system, through the common-frequency simulcasting process of respective satellite synchronization module, carrier frequency keeps stable signal synchronously to launch downwards the most at last, thus enable mobile terminal receive the back information of adjacent two telepoint base stations in overlay region simultaneously, under the equilibrium treatment of Node Controller and the Synchronization Control of satellite synchronization module, back information can not produce co-channel interference phenomenon, avoids the generation of distortion, failure conditions.Certainly, broadcast with keeping pouring in owing to adopting, all digital intercom terminals in native system signal cover all can receive this calling, so how the digital intercom terminal no matter sending this time calling moves, as long as it is in system signal coverage, all can receive this callback, the whole network really achieving moving process is communicated with, and facilitates use procedure, improves service efficiency.
The short message transmission of the same suitable for movable terminal of said process, its process is consistent with voice call procedure, does not repeat them here.
Claims (3)
1. a digital common-frequency broadcasting intercom system, is characterized in that, comprises a control centre and two or more telepoint base station, and for link device that control centre is connected with telepoint base station signal; Described control centre comprises the node switch and Node Controller that adopt embedded hard switching technology, and webmaster terminal; Described telepoint base station comprises with broadcasting channel controller, BTS channel machine and antenna feeder equipment;
Described node switch carries out the transmission of contact information by link device with broadcasting channel controller;
What the information that described Node Controller receives node switch carried out signal source according to error rate mode sentences choosing, and the best road signal obtained after sentencing choosing is transmitted to all telepoint base stations after equilibrium treatment;
Described webmaster terminal be responsible for whole system condition monitoring, fault warning display, long-range setting is carried out to system parameters;
The described Signal transmissions with broadcasting channel controller and being undertaken by BTS channel machine and antenna feeder equipment and extraneous mobile digital intercommunication terminal under MR/PDT agreement, and utilize the node switch of link device and control centre to carry out information transmission.
2. digital common-frequency broadcasting intercom system according to claim 1, it is characterized in that, described same broadcasting in channel controller is provided with satellite synchronization module, and satellite synchronization module adopts the mode of triones navigation system and the backup of GPS navigation system double star carry out the reception of satellite time service system and provide pulse per second (PPS) as the time-base signal of high stable CF signal.
3. digital common-frequency broadcasting intercom system according to claim 1, is characterized in that, described link device is the Hot Spare combination of in VHF/UHF wireless link, ethernet link and E1 link any two kinds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201520046287.1U CN204350304U (en) | 2015-01-23 | 2015-01-23 | Digital common-frequency broadcasting intercom system |
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| CN201520046287.1U CN204350304U (en) | 2015-01-23 | 2015-01-23 | Digital common-frequency broadcasting intercom system |
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| CN204350304U true CN204350304U (en) | 2015-05-20 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108791373A (en) * | 2018-07-18 | 2018-11-13 | 兖州煤业股份有限公司 | A kind of railway plane car transferring system |
| CN109218999A (en) * | 2018-07-23 | 2019-01-15 | 成都鼎桥通信技术有限公司 | A kind of the similar of PDT system broadcasts base station and system |
| CN109547046A (en) * | 2018-11-15 | 2019-03-29 | 天津七二通信广播股份有限公司 | A kind of railway plane shunting system and implementation method with common-frequency simulcasting function |
| CN109600788A (en) * | 2018-12-28 | 2019-04-09 | 北京交通大学 | A kind of police Digital Clustering is eated dishes without rice or wine the method for uniformity test |
| CN109831224A (en) * | 2018-07-18 | 2019-05-31 | 海南宝通实业公司 | It is a kind of to be transferred the letter the equipment of expansible common-frequency simulcasting based on single channel |
| CN110099359A (en) * | 2019-05-16 | 2019-08-06 | 广州维德科技有限公司 | A kind of mirror image cluster communication system |
| CN110582057A (en) * | 2019-08-13 | 2019-12-17 | 河北远东通信系统工程有限公司 | PDT police digital cluster terminal satellite positioning data reporting method |
| CN110677534A (en) * | 2019-09-03 | 2020-01-10 | 中国人民解放军陆军工程大学 | Simplex talkback mobile terminal and method for preventing missed call answering of incoming call |
| CN112383930A (en) * | 2020-11-12 | 2021-02-19 | 东方通信股份有限公司 | Method for distributing same-frequency simulcasting carrier |
| CN114567706A (en) * | 2022-04-29 | 2022-05-31 | 易联科技(深圳)有限公司 | Public network talkback equipment jitter removal method and public network talkback system |
| CN116017364A (en) * | 2023-03-02 | 2023-04-25 | 广东越新微系统研究院 | Simulcast signal transmission method and device |
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2015
- 2015-01-23 CN CN201520046287.1U patent/CN204350304U/en not_active Expired - Fee Related
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108791373A (en) * | 2018-07-18 | 2018-11-13 | 兖州煤业股份有限公司 | A kind of railway plane car transferring system |
| CN108791373B (en) * | 2018-07-18 | 2024-04-12 | 兖矿能源集团股份有限公司 | Railway plane shunting system |
| CN109831224A (en) * | 2018-07-18 | 2019-05-31 | 海南宝通实业公司 | It is a kind of to be transferred the letter the equipment of expansible common-frequency simulcasting based on single channel |
| CN109218999A (en) * | 2018-07-23 | 2019-01-15 | 成都鼎桥通信技术有限公司 | A kind of the similar of PDT system broadcasts base station and system |
| CN109218999B (en) * | 2018-07-23 | 2022-09-02 | 成都鼎桥通信技术有限公司 | Similar simulcast base station and system of PDT system |
| CN109547046A (en) * | 2018-11-15 | 2019-03-29 | 天津七二通信广播股份有限公司 | A kind of railway plane shunting system and implementation method with common-frequency simulcasting function |
| CN109600788B (en) * | 2018-12-28 | 2020-08-18 | 北京交通大学 | Police digital cluster air interface consistency test method |
| CN109600788A (en) * | 2018-12-28 | 2019-04-09 | 北京交通大学 | A kind of police Digital Clustering is eated dishes without rice or wine the method for uniformity test |
| CN110099359A (en) * | 2019-05-16 | 2019-08-06 | 广州维德科技有限公司 | A kind of mirror image cluster communication system |
| CN110582057A (en) * | 2019-08-13 | 2019-12-17 | 河北远东通信系统工程有限公司 | PDT police digital cluster terminal satellite positioning data reporting method |
| CN110677534A (en) * | 2019-09-03 | 2020-01-10 | 中国人民解放军陆军工程大学 | Simplex talkback mobile terminal and method for preventing missed call answering of incoming call |
| CN110677534B (en) * | 2019-09-03 | 2021-03-16 | 中国人民解放军陆军工程大学 | Simplex talkback mobile terminal and method for preventing missed call answering of incoming call |
| CN112383930A (en) * | 2020-11-12 | 2021-02-19 | 东方通信股份有限公司 | Method for distributing same-frequency simulcasting carrier |
| CN112383930B (en) * | 2020-11-12 | 2022-06-21 | 东方通信股份有限公司 | Method for distributing same-frequency simulcasting carrier |
| CN114567706A (en) * | 2022-04-29 | 2022-05-31 | 易联科技(深圳)有限公司 | Public network talkback equipment jitter removal method and public network talkback system |
| CN116017364A (en) * | 2023-03-02 | 2023-04-25 | 广东越新微系统研究院 | Simulcast signal transmission method and device |
| CN116017364B (en) * | 2023-03-02 | 2023-06-27 | 广东越新微系统研究院 | Simulcast signal transmission method and device |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150520 Termination date: 20210123 |