CN109743397B - Marine information early warning system and method and electronic equipment - Google Patents
Marine information early warning system and method and electronic equipment Download PDFInfo
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Abstract
The invention discloses a marine information early warning system which comprises a shipborne gateway, a communication unit, an early warning console, a meteorological disaster research unit, an early warning information release unit and a terminal, wherein the meteorological disaster research unit and the early warning information release unit are connected with the early warning console, the early warning console is communicated with the shipborne gateway through the communication unit, the communication unit comprises a Beidou satellite communication unit, a wind and cloud four-number communication unit, a short wave communication unit, a communication satellite communication unit and a mobile communication unit, and the Beidou satellite communication unit, the wind and cloud four-number communication unit, the short wave communication unit, the communication satellite communication unit and the mobile communication unit are connected with the shipborne gateway and the early warning console. The invention comprises a plurality of communication units, has high coverage rate and can realize all-ocean communication transmission; the issued information is differentially encoded, sent in a multi-channel mode and received and restored by the shipborne gateway, so that the cost of returning the information by the system is reduced, and the efficiency is higher.
Description
Technical Field
The invention relates to the technical field of marine communication, in particular to a marine information early warning system, a marine information early warning method and electronic equipment.
Background
China is a large international shipping country and has a vast sea area. Severe weather and sea conditions such as storm, billow, rainstorm, dense fog, ocean current, sea ice and the like seriously threaten the navigation and operation safety of offshore ships and facilities, and a meteorological department aims to realize full coverage of offshore public services and early warning information release, all-weather offshore monitoring and early warning and obviously improve the ocean meteorological guarantee capability.
However, the existing offshore and terminal communication is high in cost, single in function and volatile. Therefore, it is necessary to provide a stable, wide-coverage, low-cost and high-communication-efficiency marine early warning scheme.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a marine information early warning system, which can solve the problems of high communication cost, volatile connection capacity and small coverage range in the prior art.
The second purpose of the invention is to provide a marine information early warning method, which can solve the problems of high communication cost, volatile connection capacity and small coverage range in the prior art.
The present invention is also directed to an electronic device, which can solve the problems of high communication cost, volatile connection capacity and small coverage area in the prior art.
One of the purposes of the invention is realized by adopting the following technical scheme:
the marine information early warning system comprises a meteorological disaster research unit, an early warning information release unit, an early warning control console, a communication unit, a shipborne gateway and a terminal, wherein the meteorological disaster research unit and the early warning information release unit are connected with the early warning control console; the terminal is connected with the shipborne gateway through a USB or a short-distance wireless communication unit;
the early warning control console is used for carrying out differential coding processing on information fragments issued by the meteorological disaster research unit and the early warning information issuing unit and then sending the information fragments to the shipborne gateway through the communication unit, the shipborne gateway is used for decoding and calculating the data packet to obtain original information fragments, when the situation that the same information fragments as the currently decoded and calculated information fragments are stored in the memory is judged, the information fragments with the same ID codes in the memory are recombined in a preset sequence, and the recombined information is displayed on the terminal.
Preferably, the communication satellite communication unit includes an skynt one satellite communication module and a maritime satellite communication module.
Preferably, the mobile communication unit includes one or more of 2G communication, 3G communication, and 4G communication.
Preferably, the onboard gateway is further connected with a WLAN communication unit, a Zigbee communication unit, and a radio communication unit.
The second purpose of the invention is realized by adopting the following technical scheme:
the marine information early warning method is applied to an information early warning system and comprises a shipborne gateway, a communication unit, an early warning console, a meteorological disaster research unit, an early warning information release unit and a terminal, and comprises the following steps:
a receiving step: monitoring all communication channels so as to receive and store data packets from the early warning console through the communication unit; the data packet has a unique ID code; the data packet is obtained by processing the acquired data sent by the meteorological disaster research unit and the early warning information release unit by the early warning console; the data packet comprises a packet header and a message, wherein the packet header comprises a unique ID code of the data packet;
and (3) decoding: decoding and calculating the received data packet to obtain corresponding information fragments;
and (3) comparison: judging whether the information fragment which is the same as the currently decoded and calculated information fragment is stored in the memory, if so, discarding the currently received information fragment, otherwise, storing the currently decoded and calculated information fragment;
a recombination step: recombining the information fragments with the same ID code in the memory according to a preset sequence;
a distribution step: sending the recombined information to a terminal for display;
a request step: and sending a data request to the early warning console through the communication unit.
Preferably, in the receiving step, it is further determined whether the received data packet is stored in the memory according to the ID code, if so, the data packet is discarded, otherwise, the data packet is stored.
Preferably, a judging step is further included between the aligning step and the recombining step: and judging whether the total number of the information fragments corresponding to the same ID code in the memory is consistent with the number of the original information fragments of the data packet, if so, executing a recombination step, and otherwise, returning to the receiving step.
Preferably, in the decoding step, the information fragment has a fragment sequence number; in the reassembling step, the information fragments with the same ID codes in the memory are reassembled according to the arrangement sequence of the fragment serial numbers.
Preferably, the fragment sequence numbers of all the information fragments are recorded as a first sequence, any two adjacent information fragments are respectively subjected to differential coding, the differential coding of any two adjacent information fragments is subjected to the same or operation to obtain a sequence number, all the sequence numbers are recorded as a second sequence, three information fragments are selected from the second sequence, and the information fragments at the position of 3K +1 are selected from the first sequence to enable the information fragments to carry redundant information; wherein K is a constant.
The third purpose of the invention is realized by adopting the following technical scheme:
an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable by the processor, the computer program when executed by the processor implementing the steps of:
a receiving step: monitoring all communication channels so as to receive and store data packets from the early warning console through the communication unit; the data packet has a unique ID code; the data packet is obtained by processing the acquired data sent by the meteorological disaster research unit and the early warning information release unit by the early warning console; the data packet comprises a packet header and a message, wherein the packet header comprises a unique ID code of the data packet;
and (3) decoding: decoding and calculating the received data packet to obtain corresponding information fragments;
and (3) comparison: judging whether the information fragment which is the same as the currently decoded and calculated information fragment is stored in the memory, if so, discarding the currently received information fragment, otherwise, storing the currently decoded and calculated information fragment;
a recombination step: recombining the information fragments with the same ID code in the memory according to a preset sequence;
a distribution step: sending the recombined information to a terminal for display;
a request step: and sending a data request to the early warning console through the communication unit.
Compared with the prior art, the invention has the beneficial effects that:
the communication mode of the invention simultaneously comprises communication units of various channels, has high coverage rate and can realize all-ocean communication transmission; the data packet is sent to the shipborne gateway after the acquired information is subjected to differential coding processing, and the shipborne gateway can recover other information fragments by combining the original information fragments in a multidirectional calculation manner, so that the data loss rate is greatly reduced, the cost of system returned information is reduced, and the efficiency is higher.
Drawings
FIG. 1 is a block diagram of the marine information early warning system of the present invention;
FIG. 2 is a flow chart of a marine information warning method of the present invention;
FIG. 3 is a diagram of the packet composition of the present invention;
fig. 4 is a diagram of an example of information slicing coding according to the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings and the detailed description below:
as shown in fig. 1, the invention provides a marine information early warning system, which comprises a meteorological disaster research unit, an early warning information release unit, an early warning console, a communication unit, a shipborne gateway and a terminal, wherein the meteorological disaster research unit and the early warning information release unit are both connected with the early warning console; the terminal is connected with the shipborne gateway through a USB or short-distance wireless communication unit.
The stability of the short-wave communication unit depends on an ionized layer, the short-wave communication unit covers the range of 500-1000 kilometers at sea, the speed can reach 2400bps, one-way communication is realized, the terminal cost and the operation cost are both low, and digitization is supported. The Fengyun four-number communication has high stability, wide sea coverage range and one-way communication rate of 600bps/150bps, and is low in operation cost but high in terminal cost. The Beidou satellite communication unit has high stability, wide sea coverage range and 140bpm speed, supports single/two-way communication, does not support multimedia, and has low terminal cost and low operation cost. The communication satellite communication unit such as the Tiantong number I has the advantages of large weather influence on stability, wide sea coverage range, 384kbps speed, support for single/two-way communication and multimedia, high terminal cost and high operation cost. The mobile cellular channel has high stability, the coverage area is usually within 50km along the sea, the two-way communication is realized, the multimedia is supported, and the terminal cost and the operation cost are low.
The multiple channels have the advantages and the disadvantages, and the multiple channels are combined and integrated into the multiple channels, so that all-weather and all-sea coverage can be simultaneously met. When data is transmitted, the data packet is transmitted to each channel after weighted calculation according to the latest communication rate of each channel. The ship-borne gateway can select the optimal channel to return to the early warning console by observing data, inquiring requests, feeding back data, providing warning information, early warning comprehensive information and the like. The shore-based early warning control console is connected with the plurality of communication units, and performs data encapsulation, protocol unpacking, multi-channel broadcasting/single-channel pushing in a downlink mode, distribution application and data analysis in an uplink mode, protocol packing and multi-channel receiving in an uplink mode. And in the shipborne gateway, the downlink carries out multichannel receiving, protocol packaging, data analysis and distribution application, and the uplink realizes sending, channel optimization, protocol unpacking and data encapsulation.
The early warning control console is used for carrying out differential coding processing on information fragments issued by the meteorological disaster research unit and the early warning information issuing unit and sending data packets to the shipborne gateway through the communication unit, the shipborne gateway is used for decoding and calculating the processed information fragments to obtain original information fragments, when the information fragments which are the same as the currently decoded and calculated information fragments are judged to be stored in the memory, the information fragments with the same ID codes in the memory are recombined in a preset sequence, and the recombined information is displayed on the terminal.
The communication satellite communication unit comprises an Tiantong first-number satellite communication module and a maritime satellite communication module. The mobile communication unit comprises one or more of 2G, 3G and 4G.
In addition, a WLAN communication unit, a Zigbee communication unit and a radio communication unit are connected to the shipborne gateway. . The invention can also be externally connected with a router of a Beidou satellite, and provides positioning and time service once a day. The method comprises the steps that instructions are transmitted through a gateway, positioning and time service requests are sent to all ships through a Beidou satellite communication unit, the ships return to current positioning after acquiring the requests, the Beidou satellite communication unit records the time of returning information, the time required for transmission is calculated, the instructions of current time and transmission one-way time are used, and the onboard gateway acquires the instructions and updates the time.
The invention integrates and utilizes the existing satellite communication, short wave communication and mobile communication, and realizes a high fault-tolerant scheme for supporting single transmission, group transmission and full-network group transmission of early warning information in a multi-channel parallel broadcasting mode.
When the information interaction is carried out with a shore base, the intelligent routing selection and transmission are carried out on the shore base information, the data packets can carry out weighted average calculation through the transmission rate of each channel, the transmission proportion of each channel in unit time is obtained, and all the data packets are transmitted to each corresponding channel according to the proportion. When information interaction is carried out with a terminal, the information fragments are broadcasted to the terminal, and the terminal sequences and restores the received information fragments according to the rule of differential coding and integrates the information fragments into a data packet.
Because the maritime communication is mainly one-way communication and the two-way communication is high in cost, each information fragment is mutually linked through differential coding, and even if part of fragments are lost, information can be recovered through mutual operation of other fragments, the frequency of return transmission and retransmission is reduced, and the cost is reduced.
The operator on duty inputs the early warning in the early warning information issuing system, confirms issuing through auditing, and the information package can be sent to the early warning control cabinet, and the early warning control cabinet can carry out section encapsulation and coding to the information package, then according to the speed of each passageway, distributes to each passageway and spreads. The shipborne gateway can always monitor the information of each channel, once the data broadcasting is started, the shipborne gateway can collect the data packet, and the data packet is restored through calculation, and then the information is displayed on various terminals in a wired or wireless mode.
As shown in fig. 2, the present invention further provides a marine information early warning method, which is applied to the information early warning system provided by the present invention, and includes a meteorological disaster research unit, an early warning information issuing unit, an early warning console, a communication unit, a shipborne gateway and a terminal, and includes the following steps:
s1: sending a data request to an early warning console through a communication unit;
the user sends the collected marine data and other data on-demand requests back to the early warning console through the shipborne gateway and the communication unit, and the meteorological disaster research unit collects the marine data for research; and the early warning information issuing unit can acquire the data request, generate the on-demand content, and send the on-demand content to the shipborne gateway through multichannel again after being processed by the early warning console. In the step, the shipborne gateway sends out a data request through a communication unit like an early warning console, and the data request can be sent once every preset time. The early warning console acquires information generated by the received meteorological disaster research unit and the early warning information release unit, and sends data packets related to data requests sent by the shipborne gateway to the shipborne gateway through the multi-channel single. The invention particularly updates and broadcasts early warning information uninterruptedly in advance before the arrival of a marine disaster such as typhoon and tsunami. The operators and fishermen on the sea receive the information and start to leave the dangerous area.
S2: monitoring all communication channels to receive and store the information fragments from the early warning console through the communication unit; the information fragment has a unique ID code; the information fragments are obtained by processing the acquired data sent by the meteorological disaster research unit and the early warning information release unit by the early warning console;
the invention differentially encodes the data packet into a plurality of information fragments, and simultaneously transmits the plurality of information fragments through a plurality of channels. For the party receiving the information fragments, due to the difference of speaking rate, delay and the like of each channel, the time stamps of each piece of information fragment are not necessarily the same, nor are they necessarily received in sequence. Because a differential coding technology is adopted, the shipborne gateway needs to perform calculation and sequencing, and information can be recovered and recombined according to mutual operation.
In this step, the data packets are, for example, early warning information, the ID codes are IDs of the early warning information, each early warning information carries a unique ID code, the ID codes are compared to help determine whether the shipborne gateway has successfully received all the data packets of the early warning information, and if the reception is completed, the data packets received later with the same ID code are discarded.
S3: decoding and calculating the received information to obtain corresponding information fragments; the difference between the differential coding and the differential coding of a single number is that the numbers at the corresponding positions of the whole slice are subjected to differential coding respectively.
S4: judging whether the information fragment which is the same as the currently decoded and calculated information fragment is stored in the memory, if so, discarding the currently received information fragment, otherwise, storing the currently decoded and calculated information fragment;
each early warning message is divided into a plurality of message fragments. After receiving the data packet, the shipborne gateway obtains each information fragment through decoding and calculation. If the information fragment is already obtained in the storage through decoding calculation, the fragment is discarded. And meanwhile, whether the information blocks are completely collected is judged by monitoring the number of the information fragments and judging whether the number of the information fragments is consistent with the total number of the original fragments.
S5: recombining the information fragments with the same ID code in the memory according to a preset sequence;
s6: and sending the recombined information to a terminal for display.
Between S4 and S5, it may further include determining whether the total number of information fragments corresponding to the same ID code in the memory is consistent with the number of original information fragments of the data packet, if so, executing step S6, otherwise, returning to step S1.
In step S2, it is further determined whether the received information fragment is stored in the memory according to the ID code, and if so, the information fragment is discarded, otherwise, the information fragment is stored. In S2, the information fragment has a fragment sequence number; in step S5, the information fragments with the same ID code in the memory are reassembled according to the sequence of the fragment sequence numbers.
Referring to fig. 3, before information transmission, information to be transmitted is divided into a plurality of information fragments with equal length, and each block is marked with a sequence number, where the sequence number is a fragment sequence number of the information fragment and can be denoted as a first sequence { an }. And then, carrying out differential coding on two adjacent information blocks, carrying out the same or operation on each bit of the two information blocks to obtain another column of coded fragments, and marking the labels as a second sequence { bn }. The purpose is to make two adjacent information fragments generate a relationship, and if one of the information fragments is lost, the lost information fragment can still be recovered through calculation. During packaging, three coding fragments are randomly selected from { bn }, and in addition, the fragment overhead at the position of '3 k + 1' is randomly extracted from the original information fragment { an } to be used as redundancy. The position of 3k +1 is just enough to satisfy the three coding fragments in quantity, and the positions are not far apart, so that the failure probability can be greatly reduced. Two adjacent information fragments { an } are subjected to the same or difference operation to obtain another group of information fragments { bn }, wherein fragment data in the graph is the information fragments. Referring to fig. 4, for example, a group of information slices in bn is lost, all information slices an can still be restored through the other two directions. The data slices in the figure are also information slices.
The invention transmits point-to-multi, and one control platform corresponds to a plurality of terminals. The Aloha mode is used and if successful, no reply is made. Only if the reception fails, the reply is made. Not only saves the cost, but also can not cause communication conflict. Real-time communication is not needed, and a store-and-forward communication mode is adopted. Because the information of the early warning ID is added in the data packet header, the early warning ID is compared with the ID in the storage, and the data packet is selected to be discarded or collected. Unlike ordinary transmission completion, transmission is not completed upon receipt of an end instruction, but is determined by counting the number of fragments in storage. The invention is not afraid of discrete packet loss, and only the recovery of the information packet can be influenced by the special continuous two or more packet loss conditions. Thus, the probability of communication failure caused by packet loss is greatly reduced.
The shipborne gateway can realize mass sending, group sending and single sending, wherein the mass sending is to set a packet header as a broadcast address. And in a normal time, the data packet is released to all the terminals in a broadcasting mode. The group sending can be combined with a maritime monitoring system such as AIS, and the like, groups are selected or defined through circle selection, and then multi-channel single sending is carried out on users in the groups. The single shot is a single shot of the specified user in conjunction with the data request of the user in step S1.
The invention also provides an electronic device comprising a memory, a processor and a computer program stored in the memory and executable by the processor, the computer program, when executed by the processor, implementing the steps of:
a request step: sending a data request to an early warning console through a communication unit; a receiving step: monitoring all communication channels to receive and store the information fragments from the early warning console through the communication unit; the information fragment has a unique ID code; the information fragments are obtained by processing the acquired data sent by the meteorological disaster research unit and the early warning information release unit by the early warning console; and a decoding step: decoding and calculating the received information to obtain corresponding information fragments; and (3) comparison: judging whether the information fragment which is the same as the currently decoded and calculated information fragment is stored in the memory, if so, discarding the currently received information fragment, otherwise, storing the currently decoded and calculated information fragment; a recombination step: recombining the information fragments with the same ID code in the memory according to a preset sequence; a distribution step: and broadcasting all the information fragments of the recombined information to the terminal in sequence.
The shipborne gateway receives, processes, screens and distributes the broadcast data. The shore-based information is intelligently routed and transmitted, and wired/wireless network communication service is provided for the information in the ship. After receiving all the fragments, the shipborne gateway distributes the information to the terminal through the USB interface or the short-distance wireless communication network on the ship, and the terminal displays the information.
Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present invention.
Claims (3)
1. The marine information early warning system is characterized by comprising a meteorological disaster research unit, an early warning information release unit, an early warning console, a communication unit, a shipborne gateway and a terminal, wherein the meteorological disaster research unit and the early warning information release unit are connected with early warning; the terminal is connected with the shipborne gateway through a USB or a short-distance wireless communication unit;
the early warning control console is used for carrying out differential coding processing on information fragments issued by the meteorological disaster research unit and the early warning information issuing unit, simultaneously sending a plurality of information fragments to the shipborne gateway through the communication unit, calculating and sequencing the shipborne gateway, decoding and calculating the processed information fragments to obtain original information fragments, judging whether the same information fragments as the currently decoded and calculated information fragments are stored in the memory when judging that the same information fragments as the currently decoded and calculated information fragments are stored in the memory, if so, discarding the currently received information fragments, otherwise, storing the currently decoded and calculated information fragments, recombining the information fragments with the same ID codes in the memory in a preset sequence, and displaying the recombined information on a terminal;
before the information fragments with the same ID codes in the memory are recombined in a preset sequence, the method further comprises the following steps: judging whether the total number of the information fragments corresponding to the same ID code in the memory is consistent with the information fragment number of the original information;
the information fragments have fragment serial numbers; in the reorganization step, the information fragments with the same ID codes in the memory are reorganized according to the arrangement sequence of the fragment serial numbers;
recording the fragment serial numbers of all the information fragments as a first sequence, respectively carrying out differential coding on any two adjacent information fragments, carrying out exclusive-nor operation on the differential coding of any two adjacent information fragments to obtain a serial number, recording all the serial numbers as a second sequence, selecting three information fragments from the second sequence, and selecting the information fragments at the position of 3K +1 from the first sequence to enable the information fragments to carry redundant information; wherein K is a constant;
the communication satellite communication unit comprises an Tiantong first-number satellite communication module and a maritime satellite communication module; the mobile communication unit comprises one or more of 2G, 3G and 4G; the shipborne gateway is also connected with a WLAN communication unit, a Zigbee communication unit and a radio communication unit;
the early warning console performs data encapsulation, protocol unpacking, multi-channel broadcasting/single-channel pushing in a downlink mode, and performs distribution application, data analysis, protocol packing and multi-channel receiving in an uplink mode;
the ship-borne gateway downlink carries out multichannel receiving, protocol packaging, data analysis and distribution application, and the uplink realizes sending, channel optimization, protocol unpacking and data encapsulation;
and the shipborne gateway puts in the data packet to all the terminals in a broadcasting mode.
2. The marine information early warning method is characterized by comprising the following steps:
a receiving step: monitoring all communication channels, and receiving and storing information fragments from the early warning console through the communication unit; the information fragment has a unique ID code; the information fragments are obtained by carrying out differential coding processing on information sent by a meteorological disaster research unit and an early warning information release unit by an early warning console; whether the information corresponding to the received information fragment is stored in the memory is judged according to the ID code, if so, the information fragment is discarded, and if not, the information fragment is stored;
and a decoding step: decoding and calculating the received information to obtain corresponding information fragments;
and (3) comparison: judging whether the information fragment which is the same as the currently decoded and calculated information fragment is stored in the memory, if so, discarding the currently received information fragment, otherwise, storing the currently decoded and calculated information fragment;
a recombination step: recombining the information fragments with the same ID codes in the memory according to a preset sequence;
a distribution step: sending the recombined information to a terminal for display;
a request step: sending a data request to an early warning console through a communication unit;
the method also comprises a judging step between the comparison step and the recombination step: judging whether the total number of the information fragments corresponding to the same ID code in the memory is consistent with the information fragment number of the original information, if so, executing a recombination step, otherwise, returning to the receiving step;
in the decoding step, the information fragment has a fragment sequence number; in the reorganization step, the information fragments with the same ID codes in the memory are reorganized according to the arrangement sequence of the fragment serial numbers;
recording the fragment serial numbers of all the information fragments as a first sequence, respectively carrying out differential coding on any two adjacent information fragments, carrying out exclusive-nor operation on the differential coding of any two adjacent information fragments to obtain a serial number, recording all the serial numbers as a second sequence, selecting three information fragments from the second sequence, and selecting the information fragments at the position of 3K +1 from the first sequence to enable the information fragments to carry redundant information; wherein K is a constant;
the early warning console is connected with the plurality of communication units, differentially encodes a data packet into a plurality of information fragments, and simultaneously sends the information fragments through a plurality of channels; downlink data packaging, protocol unpacking, multi-channel broadcasting/single-channel pushing, uplink data distribution application, data analysis, protocol packaging and multi-channel receiving;
the early warning console is communicated with the shipborne gateway through the communication unit;
for the party receiving the information fragments, the shipborne gateway performs calculation and sequencing, and recovers the information and recombines the information according to mutual operation;
the ship-borne gateway downlink carries out multichannel receiving, protocol packaging, data analysis and distribution application, and the uplink realizes sending, channel optimization, protocol unpacking and data encapsulation;
and the shipborne gateway puts in the data packet to all the terminals in a broadcasting mode.
3. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable by the processor, wherein the computer program is executed by the processor to perform the marine information warning method of claim 2.
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| CN112422142A (en) * | 2020-11-10 | 2021-02-26 | 福建省亿坤通信股份有限公司 | Maritime communication method and system |
| CN112566091B (en) * | 2020-11-16 | 2022-11-11 | 国家卫星气象中心(国家空间天气监测预警中心) | System for rapidly transmitting meteorological disaster early warning information |
| CN113099377B (en) * | 2021-03-09 | 2023-03-24 | 中国气象局公共气象服务中心(国家预警信息发布中心) | Shipborne gateway communication system and method |
| CN112954649A (en) * | 2021-03-10 | 2021-06-11 | 广东省气象公共服务中心(广东气象影视宣传中心) | Ocean communication method and system |
| CN116032349B (en) * | 2023-03-21 | 2023-06-16 | 国网吉林省电力有限公司信息通信公司 | Early warning information release system based on Beidou satellite and short-distance wireless communication |
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| CN101257441A (en) * | 2008-02-29 | 2008-09-03 | 华为技术有限公司 | Method, equipment and system for forwarding message as well as equipment for receiving message |
| CN102752669A (en) * | 2011-04-19 | 2012-10-24 | 中国电信股份有限公司 | Transfer processing method and system for multi-channel real-time streaming media file and receiving device |
| CN103037542A (en) * | 2013-01-17 | 2013-04-10 | 海南大学 | Mobile communication system catering to sea ships |
| CN106357330A (en) * | 2015-07-16 | 2017-01-25 | 南方科技大学 | Wireless data downlink sending method and device |
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