CN106028360B - Portable digital base station system - Google Patents
Portable digital base station system Download PDFInfo
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- CN106028360B CN106028360B CN201610615598.4A CN201610615598A CN106028360B CN 106028360 B CN106028360 B CN 106028360B CN 201610615598 A CN201610615598 A CN 201610615598A CN 106028360 B CN106028360 B CN 106028360B
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- base station
- access gateway
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/18—Network planning tools
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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
- H04W88/08—Access point devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention provides a portable digital base station system, and relates to the technical field of communication. The portable digital base station system comprises a portable digital base station, a public network access gateway, a wired access gateway and a wireless access gateway, wherein the public network access gateway is in communication connection with the portable digital base station, the wired access gateway and the wireless access gateway are respectively used for being in communication connection with a communication system, and the public network access gateway is selectively in communication connection with the communication system through the wired access gateway or the wireless access gateway. The portable digital base station system solves the problem of coverage blind areas of a communication system, is convenient and flexible to network, provides effective guarantee for public security, fire protection, armed police and the like on emergencies and daily communication guarantee tasks, and has stable communication quality.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a portable digital base station system.
Background
The communication system of the emergency command which is established by the departments of public security, fire protection, armed police and the like at present can cover a main urban area and an important area and can basically meet the demands of daily service command. However, most of the existing communication systems adopt an optical cable transmission mode, so that the coverage area of the communication system is still often unable to meet the use needs of users due to the influence of geographical environment and external factors, and sudden events and daily communication guarantee tasks are still heavy. However, the elimination of service blind areas of large-scale base stations is obviously impractical, the cost of building fixed base stations is high, the station building period is long (base station site selection, equipment installation and opening), the difficulty of base station point selection is large, the communication range is limited, and links and base station equipment are required to be frequently maintained.
Therefore, how to improve the signal coverage and ensure that the signal of the communication network extends to the task guarantee area and the event burst area is a problem to be solved in the technical field of target communication.
Disclosure of Invention
It is an object of the present invention to provide a portable digital base station system to ameliorate the above problems.
The invention is realized in the following way:
a portable digital base station system comprising: the public network access gateway is in communication connection with the portable digital base station, the wired access gateway and the wireless access gateway are respectively used for being in communication connection with a communication system, and the public network access gateway is selectively in communication connection with the communication system through the wired access gateway or the wireless access gateway.
The portable digital base station system as described above, preferably, the public network access gateway is configured to select to connect to the communication system in communication through the wireless access gateway when communication with the wired access gateway is disconnected.
In the above portable digital base station system, preferably, the number of the portable digital base stations is plural, and the plural portable digital base stations are respectively in communication connection with the public network access gateway, and the portable digital base station system further includes a switching controller electrically connected between the public network access gateway and the wired access gateway, and between the public network access gateway and the wireless access gateway.
A portable digital base station system as described above, preferably, the portable digital base station comprises: the system comprises a duplexer, a digital receiving unit, a digital transmitting unit, a digital base station controller, a signaling receiving and transmitting controller and a public network link gateway for communicating with the public network access gateway, wherein the digital receiving unit and the digital transmitting unit are respectively and electrically connected with the duplexer and the digital base station controller, the signaling receiving and transmitting controller is respectively and electrically connected with the digital base station controller and the public network link gateway, the duplexer is used for carrying out signal isolation on the digital receiving unit and the data transmitting unit, the signaling receiving and transmitting controller is used for carrying out conversion on control signaling and signaling control of voice communication, and the digital base station controller is used for carrying out coding and decoding and digital processing on voice signals.
In the above portable digital base station system, preferably, the portable digital base station further includes an encryption/decryption module, the encryption/decryption module is electrically connected between the signaling transceiver controller and the public network link gateway, and the encryption/decryption module is configured to encrypt the received voice signal and decrypt the encrypted voice signal.
The portable digital base station system as described above, preferably, further comprises a battery for supplying power.
The portable digital base station system as described above, preferably, the public network access gateway communicates with the public network link gateway selectively through a public network voice channel or a 3G/4G wireless network channel.
The portable digital base station system as described above, preferably, the public network access gateway and the public network link gateway are used for selecting the public network voice channel to communicate when communication through the 3G/4G wireless network channel fails.
In the portable digital base station system as described above, preferably, the portable digital base station further includes a signal antenna, and the signal antenna is electrically connected to the duplexer.
The portable digital base station system as described above, preferably, the portable digital base station is a base station based on DMR/PDT communication system.
For the prior art, the portable digital base station system provided by the invention has the following beneficial effects:
the portable digital base station system provided by the invention can directly forward the voice signals sent by the digital terminal (such as interphone, vehicle radio station and the like) on site through the portable digital base station, thereby realizing the emergency communication coverage of the digital terminal in a certain local range. Meanwhile, the public network access gateway, the wired access gateway or the wireless access gateway is in communication connection with the original communication system, so that the network communication with the command center is realized, the problem of coverage blind areas of the communication system is solved, the networking is convenient and flexible, and effective guarantee is provided for public security, fire protection, armed police and the like on emergencies and daily communication guarantee tasks. In addition, the communication quality stability with the command center is ensured by adopting an alternative mode of communicating with a communication system through a wired access gateway or a wireless access gateway.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a block diagram schematically illustrating a portable digital base station system according to a first embodiment of the present invention;
FIG. 2 is a functional block diagram of the portable digital base station of FIG. 1;
fig. 3 is a block diagram of still another portable digital base station system according to the first embodiment of the present invention.
Wherein, the correspondence between the reference numerals and the component names is as follows:
a portable digital base station 100, a duplexer 101, a digital receiving unit 102, a digital transmitting unit 103, a digital base station controller 104, a signaling and receiving controller 105, a public network link gateway 106, an encryption/decryption module 107, a storage battery 108, a signal antenna 109, a public network access gateway 200, a wired access gateway 300, a wireless access gateway 400, a communication system 500, and a switching controller 600.
Detailed Description
The communication system of the emergency command which is established by the departments of public security, fire protection, armed police and the like at present can cover a main urban area and an important area and can basically meet the demands of daily service command. However, most of the existing communication systems adopt an optical cable transmission mode, so that the coverage area of the communication system is still often unable to meet the use needs of users due to the influence of geographical environment and external factors, and sudden events and daily communication guarantee tasks are still heavy. However, the elimination of service blind areas of large-scale base stations is obviously impractical, the cost of building fixed base stations is high, the station building period is long (base station site selection, equipment installation and opening), the difficulty of base station point selection is large, the communication range is limited, and links and base station equipment are required to be frequently maintained. Therefore, how to improve the signal coverage and ensure that the signal of the communication network extends to the task guarantee area and the event burst area is a problem to be solved in the technical field of target communication. The inventor discovers through long-term observation and research that the portable digital base station system provided by the embodiment of the invention is provided.
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
First embodiment
Referring to fig. 1, an embodiment of the present invention provides a portable digital base station system, which includes a portable digital base station 100, a public network access gateway 200, a wired access gateway 300 and a wireless access gateway 400. The public network access gateway 200 is in communication connection with the portable digital base station 100, and the wired access gateway 300 and the wireless access gateway 400 are respectively used for communication connection with a built communication system 500 such as a digital simulcast system, a PDT (professional digital trunking ) system and the like, and the public network access gateway 200 is optionally in communication connection with the communication system 500 through the wireless access gateway 400 or the wired access gateway 300.
The portable digital base station 100 can realize emergency communication coverage of a field terminal (such as a digital interphone, a vehicle radio station and the like) in a local certain range based on a DMR/PDT communication system, can realize various calling modes of interphone single call, group call, full call, emergency call and the like, and realize networking communication with a command center connected with the communication system 500 through the public network access gateway 200, the wired access gateway 300 or the wireless access gateway 400, so as to realize an emergency communication function, solve the problem of a coverage blind area of the communication system 500, realize convenient and flexible networking, and provide effective guarantee for public security, fire protection, armed police and the like on emergencies and daily communication guarantee tasks.
Referring to fig. 2, the portable digital base station 100 includes a duplexer 101, a digital receiving unit 102, a digital transmitting unit 103, a digital base station controller 104, a transceiver controller 105, an encryption/decryption module 107, a public network link gateway 106 for communicating with a public network access gateway 200, a storage battery 108 for supplying power, and a signal antenna 109. The digital receiving unit 102 and the digital transmitting unit 103 are electrically connected to the duplexer 101 and the digital base station controller 104, respectively, and the digital base station controller 104, the signaling transceiver controller 105, the encryption/decryption module 107 and the public network link gateway 106 are electrically connected in sequence, and the signal antenna 109 is electrically connected to the duplexer 101.
The duplexer 101, the digital receiving unit 102, the digital transmitting unit 103 and the digital base station controller 104 form a digital PDT base station which is compatible with a PDT communication system of a public security department, can forward signals in a receiving range of the digital PDT base station, solves the problem of communication coverage in the receiving range, has two working modes of digital convention and PDT cluster, can switch between the two working modes of the digital convention and the PDT cluster through the selection operation of a field terminal (such as a digital interphone), and presets 16 forwarding channels for selection in the digital convention mode, so that frequency interference is avoided. The duplexer 101 is used for isolating the transmitting signal and the receiving signal, and ensuring that the receiving signal and the transmitting signal can work normally at the same time.
The digital base station controller 104 is configured to perform coding and decoding and digital processing on a voice signal, where after the received voice signal is processed by the digital base station controller 104, one path of the voice signal is locally forwarded by the digital transmitting unit 103, so that a local terminal within the coverage area of the portable digital base station 100 receives the signal, and the other path of the voice signal is sequentially encrypted by the signaling and signaling controller 105 and the encryption/decryption module 107 and then sent to the public network access gateway 200 by the public network link gateway 106, so that normal networking communication is performed with the command center, and when the public network link channel is closed, the portable digital base station 100 only performs local communication forwarding.
The transceiver signaling controller 105 converts control signaling, and the interphone calls have various modes such as single call, group call, full call, emergency call, and the like. Meanwhile, when the public network link gateway 106 is in networking communication with the command center, the communication modes are converted into corresponding signaling to be transmitted through the signaling receiving and transmitting controller 105, and meanwhile, voice recognition signaling is added by the signaling receiving and transmitting controller 105 when the communication starts and ends to realize the control of the communication.
Because public network transmission is open, potential safety hazards exist, and voice signals can be stolen and monitored in the transmission process. Therefore, the encryption/decryption module 107 electrically connected between the signaling transceiver controller 105 and the public network link gateway 106 can encrypt the voice signal by a certain algorithm before the voice signal is transmitted to the public network link gateway 106, so that the voice signal in the transmission link is encrypted, and the voice signal is decrypted at the receiving end to restore the voice signal. If the voice signal is illegally stolen, the correct voice signal cannot be analyzed without the corresponding decryption key, so that the safe transmission of the information is ensured.
In this embodiment, the signal antenna 109 may be a whip antenna or a whip antenna, and the whip antenna are portable, light, simple, compact, and convenient to move. In addition, if the coverage area needs to be enlarged, a sucker antenna or a signal gain antenna can be externally connected.
As shown in fig. 3, in this embodiment, the number of the portable digital base stations 100 may be plural, and may be increased or decreased according to practical situations, and when the number of the portable digital base stations 100 is plural, a switch controller 600 is further required to be added to the portable digital base station system, and the switch controller 600 is electrically connected between the public network access gateway 200 and the wired access gateway 300, and between the public network access gateway 200 and the wireless access gateway 400. The switching controller 600 is used for performing transfer control of signals between a plurality of portable digital base stations 100 in the portable digital base station system. Assume that the digital-carrying base station system includes 3 portable digital base stations 100, and for convenience of description, the 3 portable digital base stations 100 are respectively referred to as base stations 1, 2, and 3. Taking a complete call flow as an example, a field terminal in the signal coverage area of the base station 1 initiates a call, the digital receiving unit 102 of the base station 1 receives the voice signal of the field terminal and sends the voice signal to the digital base station controller 104 in two paths, wherein one path of voice signal is directly sent to the digital sending unit 103 by the digital base station controller 104, and the digital sending unit 103 carries out local forwarding to ensure the signal coverage of the area, and the field terminal (such as an interphone) of the area can carry out communication in the coverage area of the base station 1. The other path of voice signal is encoded by the digital base station controller 104 and sent to the signaling and receiving controller 105, the signaling and receiving controller 105 performs signaling control on the encoded voice signal, then the encoded voice signal is encrypted by the encryption/decryption module 107 and then transmitted to the public network access gateway 200 by the public network link gateway 106, and then the public network access gateway 200 sends the call signal to the switching controller 600. The voice signal is divided into two paths by the exchange controller 600, one path is uploaded to the communication system through the wired access gateway 300 or the wireless access gateway 400 and then is sent to the command center, the other path is sent to the base station 2 and the base station 3 through the public network access gateway 200, the base station 2 and the base station 3 decrypt the voice signal through the encryption/decryption module 107, the signaling conversion is carried out by the signaling receiving/transmitting controller 105, then the decoding is carried out by the digital base station controller 104, and finally the local forwarding is carried out through the digital transmitting unit 103, so that the networking communication of the 3 portable digital base stations 100 is formed. Similarly, the command center encrypts the voice signal and the signaling through the communication system 500 and the wired access gateway 300 or the wireless access gateway 400, then sends the encrypted voice signal and signaling to the exchange controller 600, sends the encrypted voice signal and signaling to the public network link gateways 106 of the 3 portable digital base stations 100 after passing through the public network access gateway 200, decrypts the encrypted voice signal and signaling by the encryption/decryption modules 107 of the 3 portable digital base stations 100, converts the signaling by the signaling receiving/transmitting controller 105, decodes by the digital base station controller 104, and finally forwards locally through the digital sending unit 103, so that the field terminal in the local area can receive the call from the command center.
In this embodiment, the storage battery 108 is a 12V/40AH lithium battery, and the 12V/40AH lithium battery can ensure the cruising operation capability of the portable digital base station 100 for about 48 hours, and ensure the long-lasting normal operation time of the portable digital base station 100. In addition, the portable digital base station 100 may also be configured with a power supply interface for direct current 12V, and when the portable digital base station 100 is installed in a car, power can be supplied to the portable digital base station 100 through a cigar lighter interface on the car.
The portable digital base station 100 and the communication system 500 can communicate through two modes of the wired access gateway 300 or the wireless access gateway 400, the wired access gateway 300 is a system level interconnection, and communication protocols are required to be disclosed by both the public network access gateway 200 and the wired access gateway 300 to control signaling and language. The wireless access gateway 400 is an open wireless access. The wired access gateway 300 and the wireless access gateway 400 are mutually backup, and when the connection between the portable digital base station 100 and the communication system 500 through the wired access gateway 300 is interrupted, the connection between the portable digital base station 100 and the communication system 500 through the wireless access gateway 400 can be switched to the redundant backup of the system connection.
The wired access gateway 300 is a bridge for interconnecting voice and control signaling of the portable digital base station 100 with the communication system 500, and because the digital systems of each manufacturer have proprietary protocols, interconnection control is performed between different digital systems, and related communication protocols need to be disclosed, the wired access gateway 300 can virtualize the portable digital base station 100 as a base station of the communication system 500.
The wireless access gateway 400 is a backup and supplement of the wired access gateway 300, and when the communication protocols cannot be agreed or the communication network is interrupted, the communication system 500 and the portable digital base station 100 can be interconnected through the wireless access gateway 400, so that the purpose of accessing the communication system 500 is achieved, and the interconnection of the remote portable digital base station 100 and the communication system 500 is completed. The independent wireless access gateway 400 does not need to be installed in a command center, and can be installed and deployed at any position of an effective access system base station.
The public network access gateway 200 and the public network link gateway 106 can selectively communicate through a public network voice channel or a 3G/4G wireless network channel, that is, two communication modes of the communication system 500 and the portable digital base station 100 are: phone through mode and network 3G/4G mode. The working principle of the phone through mode is that the command center and the portable digital base station 100 directly transmit and receive analog voice signals at the transmission port of the public network access gateway 200, the portable digital base station 100 automatically dials the phone number of the command center, the command center is in an answering mode immediately after receiving a call, and the transmission of voice is carried out in duplex mode, so that a voice communication link is established. The analog voice signal is decoded and digitally processed by the digital base station controller 104 and then sent to the digital transmitting unit 103. The network 3G/4G mode of operation is to establish a wireless network connection between the command center and the portable digital base station 100, and to transfer digital communication services through the leased public network server. The data stream is packed and transmitted through a specific communication protocol, the digital voice signal and the signaling can be directly transmitted through a network, digital-to-analog conversion is not needed, and no loss is caused to audio quality transmission.
The portable digital base station system provided in this embodiment can directly forward the voice signal sent by the digital terminal (such as interphone, vehicle radio station, etc.) on site through the portable digital base station 100, so as to realize emergency communication coverage of the digital terminal in a certain local range. Meanwhile, the public network access gateway 200, the wired access gateway 300 and the wireless access gateway 400 are in communication connection with the original communication system 500, so that the network communication with a command center is realized, the problem of coverage blind areas of the communication system is solved, the networking is convenient and flexible, and effective guarantees are provided for public security, fire protection, armed police and the like on emergencies and daily communication guarantee tasks.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A portable digital base station system, comprising: the system comprises a portable digital base station, a public network access gateway, a wired access gateway and a wireless access gateway, wherein the public network access gateway is in communication connection with the portable digital base station, the wired access gateway and the wireless access gateway are respectively used for being in communication connection with a communication system, and the public network access gateway is selectively in communication connection with the communication system through the wired access gateway or the wireless access gateway, wherein the portable digital base station is compatible with a PDT communication system and comprises two working modes of digital convention and PDT cluster;
the portable digital base station includes: the digital base station comprises a duplexer, a digital receiving unit, a digital transmitting unit, a digital base station controller, a receiving and transmitting signaling controller and a public network link gateway for communicating with the public network access gateway, wherein the digital receiving unit and the digital transmitting unit are respectively and electrically connected with the duplexer and the digital base station controller, the receiving and transmitting signaling controller is respectively and electrically connected with the digital base station controller and the public network link gateway, the duplexer is used for carrying out signal isolation on the digital receiving unit and the digital transmitting unit, the receiving and transmitting signaling controller is used for carrying out conversion on control signaling and signaling control of voice communication, and the digital base station controller is used for carrying out coding and decoding and digital processing on voice signals.
2. The portable digital base station system of claim 1, wherein the public access gateway is configured to select to communicatively connect to the communication system via the wireless access gateway when communication with the wired access gateway is disconnected.
3. The portable digital base station system of claim 1, wherein the number of portable digital base stations is a plurality, wherein the plurality of portable digital base stations are each communicatively coupled to the public network access gateway, and wherein the portable digital base station system further comprises a switch controller electrically coupled between the public network access gateway and the wired access gateway, and between the public network access gateway and the wireless access gateway.
4. The portable digital base station system of claim 1, further comprising an encryption/decryption module electrically connected between the signaling transceiver controller and the public network link gateway, the encryption/decryption module configured to encrypt received voice signals and decrypt encrypted voice signals.
5. The portable digital base station system of claim 1, wherein the portable digital base station further comprises a battery for supplying power.
6. The portable digital base station system of claim 1, wherein the public network access gateway is in selectable communication with the public network link gateway via a public network voice channel or a 3G/4G wireless network channel.
7. The portable digital base station system of claim 6, wherein the public network access gateway and the public network link gateway are configured to select the public network voice channel communication when communication through the 3G/4G wireless network channel fails.
8. The portable digital base station system of claim 1, further comprising a signal antenna, the signal antenna being electrically connected to the diplexer.
9. The portable digital base station system of claim 1, wherein the portable digital base station is a DMR/PDT communication system based base station.
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| CN201610615598.4A CN106028360B (en) | 2016-07-29 | 2016-07-29 | Portable digital base station system |
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| CN109862580B (en) * | 2017-11-30 | 2020-12-15 | 华为技术有限公司 | Network optimization method and device |
| CN107995633A (en) * | 2017-12-08 | 2018-05-04 | 深圳市共进电子股份有限公司 | A kind of more hot spot Radio Network Systems for home environment |
| CN113784459B (en) * | 2020-06-10 | 2023-09-22 | 成都鼎桥通信技术有限公司 | Communication device and communication system |
| TWI803782B (en) * | 2020-10-16 | 2023-06-01 | 明泰科技股份有限公司 | Radio network gateway and radio system |
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| CN101350966A (en) * | 2008-09-04 | 2009-01-21 | 侯万春 | Miniature base station and embedded base station gateway |
| CN101742737B (en) * | 2008-11-17 | 2014-04-16 | 中国人民解放军总参谋部通信网络技术管理中心 | Intelligent emergent wireless command system |
| US8630607B2 (en) * | 2011-07-15 | 2014-01-14 | Verizon Patent And Licensing Inc. | Emergency call handoff between heterogeneous networks |
| EP2723135A1 (en) * | 2012-10-19 | 2014-04-23 | Telefonica S.A. | A method and a system for sharing wireless broadband connection between devices |
| CN103957141A (en) * | 2014-04-04 | 2014-07-30 | 济南蓝翼网络技术有限公司 | Multi-service emergency communication system |
| CN104981013A (en) * | 2015-07-06 | 2015-10-14 | 中国科学院国家天文台 | Emergency communication system and method |
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Inventor after: Li Wenli Inventor after: Shi Junming Inventor after: Jiang Wei Inventor after: Ling Jin Inventor before: Li Wenli |
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