GB2568122B - LTE maritime emergency communications system based on unmanned surface vehicle eNodeB system - Google Patents
LTE maritime emergency communications system based on unmanned surface vehicle eNodeB system Download PDFInfo
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- GB2568122B GB2568122B GB1802192.3A GB201802192A GB2568122B GB 2568122 B GB2568122 B GB 2568122B GB 201802192 A GB201802192 A GB 201802192A GB 2568122 B GB2568122 B GB 2568122B
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- 238000004891 communication Methods 0.000 title claims description 134
- 230000001360 synchronised effect Effects 0.000 claims description 18
- 238000001228 spectrum Methods 0.000 claims description 17
- 238000010295 mobile communication Methods 0.000 claims description 10
- 238000005516 engineering process Methods 0.000 claims description 8
- 238000002121 ultrasonic speckle velocimetry Methods 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 5
- 239000000446 fuel Substances 0.000 claims description 5
- 239000013307 optical fiber Substances 0.000 claims description 5
- 238000010248 power generation Methods 0.000 claims description 5
- 230000007774 longterm Effects 0.000 claims 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B2035/006—Unmanned surface vessels, e.g. remotely controlled
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D1/00—Control of position, course, altitude or attitude of land, water, air or space vehicles, e.g. using automatic pilots
- G05D1/02—Control of position or course in two dimensions
- G05D1/0206—Control of position or course in two dimensions specially adapted to water vehicles
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/90—Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
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- Position Fixing By Use Of Radio Waves (AREA)
Description
LTE MARITIME EMERGENCY COMMUNICATIONS
SYSTEM BASED ON UNMANNED SURFACE VEHICLE
ENODEB SYSTEM
TECHNICAL FIELD
The present invention relates to the field of maritime emergency communications technologies, and specifically, to an LTE (RTM) maritime emergency communications system based on an unmanned surface vehicle (USV) eNodeB system.
BACKGROUND
Maritime communication concerns safety, communication, and management of maritime operation staff, not only facilitates healthy sustainable development of maritime economy, but also helps quickly search for and rescue victims in maritime distress. Currently, two maritime communication modes are available at home and abroad. One is satellite communication. The other is digital walkie-talkie communication. In spite of a large coverage area and a large communication capacity, satellite communication can be hardly promoted in the market due to high satellite communication charges. A digital walkie-talkie can perform only point-to-point or point-to-multipoint short-distance offshore voice communication, and cannot implement free onshore-offshore communication. Currently, a longest coverage distance of a mobile communications eNodeB is 160 km. Beyond this distance, data cannot be parsed due to a delay or the like, and communication cannot be performed.
Currently, emergency communication is generally a communication mode required for ensuring emergency rescue, aid, and necessary communication by using various communication resources comprehensively in a natural or man-made emergency situation. Emergency communication is a temporary special communication mechanism provided to deal with a natural or man-made tension situation. A conventional emergency communication networking technology is mainly to construct a dedicated network. An LTE (RTM) maritime emergency communications system based on a USV eNodeB system, which is first put forward in the present invention, uses a technology of mutual communication between an LTE (RTM) emergency communications network and a satellite communications network. In a maritime emergency situation, a maritime emergency communications system can be quickly set up by using a USV, and an ordinary mobile phone can also perform maritime network access, so that maritime communication costs are reduced.
SUMMARY
In view of this, the present invention provides an LTE (RTM) maritime emergency communications system based on a USV eNodeB system, sets up a rescue emergency communications system oriented to a maritime environment, and solves a problem of how to use satellite communication resources and a self-organizing network to deploy a maritime emergency communications system. In the system, a parent-node USV, as a core of the USV eNodeB system, is not only a relay station between a communications satellite and the USV eNodeB system, but also is responsible for monitoring and controlling a link status and a stop position of a USV sub-cluster in real time.The emergency communications system is deployed in a centralized manner, that is, the parent-node USV performs global configuration for the entire USV eNodeB system, thereby implementing network coverage in a specified sea area.
To achieve the foregoing objectives, the present invention uses the following technical means:
An LTE (RTM) maritime emergency communications system based on a USV eNodeB system includes an onshore eNodeB, a communications satellite in a synchronous orbit, a parent-node USV, and a USV sub-cluster. The onshore eNodeB introduces a satellite link segment by using a BBU and an IPRAN edge router, thereby establishing a wireless connection to the communications satellite in the synchronous orbit. The communications satellite in the synchronous orbit is a relay station between the onshore eNodeB and the USV eNodeB system. A satellite communications relay, an eNodeB, a power supply module, and a coordination control module are disposed on the parent-node USV. The satellite relay implements communication with the communications satellite by reusing a same frequency as the satellite and amplifying and forwarding signals that are received from or sent to the satellite, and also implements communication with the USV eNodeB system by using an optical fiber connection, so that mutual communication between the onshore eNodeB, the communications satellite in the synchronous orbit, and the USV eNodeB system is implemented. The eNodeB is disposed on the USV, and by using an LTE (RTM) technology and a licensed spectrum or a TV white space of an operator, the eNodeB implements mutual communication in the USV eNodeB system, and implements licensed spectrum coverage of the mobile communications operator in an emergency communications network deployment area. A solar panel, a storage battery, and a fuel power generation system used as a hybrid power supply are disposed in the power supply module. When a USV cluster sails in a specified position, the solar panel is unrolled and starts to work. The coordination control module includes a network deployment unit and a virtual power positioning and anchor control unit. The network deployment unit allocates the licensed spectrum of the mobile communications operator to the emergency communications network deployment area, and uses default LTE (RTM) protocol parameters; and obtains cell deployment information of eNodeBs in the emergency communications network, and numbers cells a first cell, a second cell, and a third cell respectively.
Preferably, obtaining numbered cell deployment information includes: obtaining division of central areas and edge areas of the network cells, sizes of edge overlapping areas of neighboring network cells, omnidirectional antenna angle setting data.
Preferably, corresponding power is allocated to the emergency communications network deployment area as follows: if a user is located in an edge overlapping area of neighboring cells in the emergency communications network deployment area, limited power is used for transmission in the overlapping area; or if a user is located in a central area of a cell in the emergency communications network deployment area, full power is used for transmission in the area.
Preferably, the transmit power may be adjusted properly according to an actual signal-to-noise ratio.
Preferably, the division of the central areas and edge areas of the network cells in the emergency communications network deployment area is dynamically adjusted according to distribution of users and services of the users, system load, and real-time locations of USVs.
Preferably, determining the overlapping areas of the neighboring network cells by the network deployment unit includes: determining the overlapping areas of the neighboring cells in the emergency communications network deployment area according to real-time location information fed back by a GPS on each eNodeB and a radius of each network cell; or determining the overlapping areas of the neighboring cells in the emergency communications network deployment area according to actual reference signal received power or paging signal strength in the network cells in the emergency communications network deployment area.
Preferably, the virtual power positioning and anchor control unit controls a distance between USV sub-clusters according to action of a sea current and the overlapping areas of the neighboring network cells. When the parent-node USV moves due to an impact of the sea current, the virtual power positioning and anchor control unit enters an instruction to a propeller according to GPS information on the eNodeB, so that the eNodeB on the parent-node USV stays in the specified position. When the parent-node USV dynamically stays in the specified position, the virtual power positioning and anchor control unit transmits a move instruction to a virtual power positioning and anchor control unit in the USV sub-cluster according to the overlapping areas of the neighboring
network cells and obtained GPS information of an eNodeB in the USV sub-cluster to control a propeller in the USV sub-cluster, so that an effective distance between eNodeBs on the USVs is controlled.
Preferably, the eNodeB, a power supply module, and the virtual power positioning and anchor control unit disposed in the USV sub-cluster have the same functions as the parent-node USV, and constitute the USV eNodeB system with the parent-node USV By using the LTE (RTM) technology and the licensed spectrum or the TV white space of the operator, the eNodeB implements mutual communication in the USV eNodeB system, and implements licensed spectrum coverage of the mobile communications operator in the emergency communications network deployment area. A solar panel, a storage battery, and a fuel power generation system used as a hybrid power supply are disposed in the power supply module. When the USV cluster sails in the specified position, the solar panel is unrolled and starts to work. The virtual power positioning and anchor control unit controls the propeller in the USV sub-cluster according to the move instruction transmitted by the parent-node USV, and feeds back the GPS information to the parent-node USV, so that an effective distance between eNodeBs in the USV cluster is controlled.
The present invention provides an LTE (RTM) maritime emergency communications system based on a USV eNodeB system. In the system, a parent-node USV, as a core of the USV eNodeB system, is responsible for quickly and flexibly deploying the eNodeB system, and performing real-time communication with a communications satellite in a synchronous orbit. The maritime emergency communications system is deployed in a centralized manner, that is, the parent-node USV implements an indirect network connection to an onshore eNodeB by using the communications satellite in the synchronous orbit, and then undergoes network cell topology deployment with other USV nodes. In the present invention, a self-organizing network communications architecture is designed by using characteristics of a USV cluster and satellite communication. This changes a maritime emergency communications system deployment mode, and improves efficiency of emergency communication and utilization of radio resources.
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic diagram of a deployment scenario of a maritime emergency communications system according to the present invention; FIG. 2 is a detailed schematic diagram of a maritime emergency communications system according to the present invention; FIG. 3 is a schematic flowchart for deploying a maritime emergency communications system according to the present invention; FIG. 4 is a table of LTE (RTM) protocol parameters used in a maritime emergency communications system according to the present invention; FIG. 5 is a control flowchart of a virtual power positioning and anchor control unit on a parent-node USV according to the present invention; and FIG. 6 is a control flowchart of a virtual power positioning and anchor control unit in a USV sub-cluster according to the present invention.
In the drawings: 1. onshore eNodeB; 2. communications satellite in a synchronous orbit; 3. parent-node USV; 31. satellite communications relay; 32. eNodeB; 33. power supply module; 34. coordination control module; 4. USV sub-cluster; 41. eNodeB; 42. power supply module; 43. virtual power positioning and anchor control unit.
DESCRIPTION OF EMBODIMENTS
The following describes the objectives, principles, and features of the present invention with reference to accompanying drawings. Examples are used merely to describe the present invention, and not intended to limit the scope of the present invention.
As shown in FIG. 1 and FIG. 2, an LTE (RTM) maritime emergency communications system based on a USV eNodeB system according to the present invention includes an onshore eNodeB 1, a communications satellite 2 in a synchronous orbit, a parent-node USV 3, and a USV sub-cluster 4.
The onshore eNodeB 1 is connected to a core network element MME by using an optical fiber transmission line, and also introduces a satellite link segment by using a BBU and an IPRAN edge router, thereby establishing a wireless connection to the communications satellite 2 in the synchronous orbit.
The communications satellite 2 in the synchronous orbit is a relay station between the onshore eNodeB 1 and the USV eNodeB system. Network connections are established between the USV eNodeB system, the communications satellite 2 in the synchronous orbit, and an eNodeB of an operator. The communications satellite is used to enable the USV eNodeB system in any offshore position to establish a network connection to the onshore eNodeB. A satellite communications relay 31, an eNodeB 32, a power supply module 33, and a coordination control module 34 are disposed on the parent-node USV 3. The satellite relay 31 implements communication with the communications satellite by reusing a same frequency as the satellite and amplifying and forwarding signals that are received from or sent to the satellite, and also implements communication with the USV eNodeB system by using an optical fiber connection, so that mutual communication between the onshore eNodeB 1, the communications satellite 2 in the synchronous orbit, and the USV eNodeB system is implemented. The eNodeB 32 is disposed on the USV, and the eNodeB implements mutual communication in the USV eNodeB system by using a licensed spectrum or a TV white space of the operator, and implements network coverage by using an LTE (RTM) technology. A solar panel, a storage battery, and a fuel power generation system used as a hybrid power supply are disposed in the power supply module 33. When a USV cluster sails in a specified position, the solar panel is unrolled and starts to work. The coordination control module 34 includes a network deployment unit and a virtual power positioning and anchor control unit. The network deployment unit obtains cell deployment information of neighboring eNodeBs in the emergency communications network, and controls a network coverage area, transmit power, a geographical location, and the like of the eNodeB 32 by using the cell deployment information. The virtual power positioning and anchor control unit controls a distance between USV sub-clusters 4 according to the coordination control module 34 and action of a sea wave, so that an effective distance between eNodeBs on USVs is controlled.
An eNodeB 41, a power supply module 42, and a virtual power positioning and anchor control unit 43 are disposed in each USV sub-cluster 4. Each eNodeB implements network communication by using the licensed spectrum or the TV white space of the operator. The power supply module 42 supplies power to the eNodeB and the USV. The virtual power positioning and anchor control unit 43 controls a distance between the USV sub-clusters 4 according to action of a sea current and an overlapping area between a network cell to which the virtual power positioning and anchor control unit 43 belongs and a neighboring network cell, so that an effective distance between eNodeBs on the USVs is controlled.
As shown in FIG. 1, FIG. 2, FIG. 3, and FIG. 4, the present invention provides a process of deploying the LTE (RTM) maritime emergency communications system. The process includes the following steps: First, after an emergency command center arranges the USV cluster to arrive at the specified position according to GPS information of an eNodeB on a USV, the eNodeB on the USV is started, and the solar panel of the power supply module 33 is unrolled and starts to work. In addition, usage of the licensed spectrum of the mobile operator in the coverage area is detected. If it is detected that the licensed spectrum of the mobile communications operator is not used, the licensed spectrum of the mobile communications operator is allocated to the emergency communications network, namely, the eNodeB on the USV, and default LTE (RTM) protocol parameters are used. If it is detected that the licensed spectrum of the mobile communications operator is used, an unused frequency of the TV white space is allocated to the eNodeB on the USV, and default LTE (RTM) protocol parameters are used.
Next, cell deployment information of eNodeBs in the emergency communications network is obtained, and numbering is performed. The eNodeB 32 on the parent-node USV 3 obtains the cell deployment information of the eNodeBs in the emergency communications network by using the licensed spectrum or the TV white space of the operator, and numbers neighboring network cells a first cell, a second cell, and a third cell. When a long CP mode is enabled, in a deployed LTE (RTM) network cell, a coverage area, namely, a coverage radius, may reach 100 km.
Then, the network deployment unit in the coordination control module 34 on the parent-node USV 3 determines overlapping areas and central areas of the neighboring cells according to the obtained cell deployment information, and allocates corresponding power to the coverage area of the emergency communications network according to the overlapping areas and the central areas. In addition, the virtual power positioning and anchor control unit in the coordination control module 34 on the parent-node USV 3 controls a location of the USV according to obtained overlapping area information of the network cells and a flow velocity and direction of a sea current, and sends an instruction to the virtual power positioning and anchor control unit 43 in the USV sub-cluster 4, to maintain the distance between the eNodeBs and ensure coverage of the communications network.
Finally, in the deployed LTE (RTM) maritime emergency communications system, the eNodeB 32 on the parent-node USV 3 establishes a connection to the satellite communications relay 31 by using an optical fiber. The satellite communications relay 31 establishes a connection to the communications satellite 2 in the synchronous orbit by reusing the same frequency as the satellite. The onshore eNodeB 1 introduces a satellite link segment by using the BBU and the IPRAN edge router, and establishes a connection to the communications satellite 2 in the synchronous orbit. In this way, a connection between the onshore eNodeB 1 and the USV eNodeB system is implemented, and the LTE (RTM) maritime emergency communications system based on the USV eNodeB system in the present invention is formed.
As shown in FIG. 5, the virtual power positioning and anchor control unit in the coordination control module 34 on the parent-node USV 3 obtains GPS information of the eNodeB on the USV, and compares the information with GPS information of the originally specified position. If the parent-node USV 3 deviates from the originally specified position under action of the sea current, the virtual power positioning and anchor control unit controls a propeller, so that the parent-node USV returns to the originally specified position. In addition, the virtual power positioning and anchor control unit obtains the overlapping areas of the neighboring network cells and GPS information of eNodeBs on other USVs, and transmits move instructions to the other USVs according to the information. If the parent-node USV 3 does not deviate from the originally specified position, the parent-node USV 3 keeps its status unchanged, and waits for next location detection to be performed by the virtual power positioning and anchor control unit.
As shown in FIG. 6, after obtaining the move instruction transmitted by the parent-node USV, the virtual power positioning and anchor control unit 43 in the USV sub-cluster 4 controls a propeller on a USV according to the move instruction, so that the USV moves to the specified position. In addition, the virtual power positioning and anchor control unit 43 obtains GPS information of the eNodeB on the USV, and feeds back the present GPS information to the parent-node USV 3.
In conclusion, by using the LTE (RTM) maritime emergency communications system based on the USV eNodeB system according to the present invention, not only the maritime emergency communications system can be deployed quickly and flexibly, but also stability of the maritime emergency communications system can be ensured and maritime emergency communication costs can be reduced.
The foregoing descriptions are merely exemplary embodiments of the present invention, but are not intended to limit the present invention. Any modification, equivalent replacement, improvement, and the like made without departing from the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (8)
1. A long term evolution (LTE) maritime emergency communication system based on an unmanned surface vehicle (USV) eNodeB system, comprising an onshore eNodeB, a communication satellite in a synchronous orbit, a parent-node USV, and a USV sub-cluster, wherein the onshore eNodeB introduces a satellite link segment by using a BBU and an IPRAN edge router for establishing a wireless connection to the communications satellite in the synchronous orbit; the communications satellite in the synchronous orbit is a relay station between the onshore eNodeB and the USV eNodeB system; a satellite communication relay, an eNodeB, a power supply module, and a coordination control module are disposed on the parent-node USV; the satellite communication relay implements communication with the communication satellite by reusing a same frequency as the satellite and amplifying and forwarding signals that are received from or sent to the satellite, and also implements communication with the USV eNodeB system by using an optical fiber connection, so that mutual communication between the onshore eNodeB, the communications satellite in the synchronous orbit, and the USV eNodeB system is implemented; the eNodeB is disposed on the USV, and by using an LTE technology and a licensed spectrum or a TV white space of an operator, the eNodeB implements mutual communication in the USV eNodeB system, and implements licensed spectrum coverage of the mobile communication operator in an emergency communication network deployment area; a solar panel, a storage battery, and a fuel power generation system used as a hybrid power supply are disposed in the power supply module, wherein a USV cluster is configured to sail in a specified position, the solar panel is configured to be unrolled and start work when the USV cluster sails in the specified position; the parent-node USV dynamically stays in the specified position, the coordination control module comprises a network deployment unit and a virtual power positioning and anchor control unit, and the virtual power positioning and anchor control unit is configured to control an effective distance between eNodeB s on the US Vs.
2. The LTE maritime emergency communication system based on a USV eNodeB system according to claim 1, wherein the network deployment unit is configured to allocate the licensed spectrum of the mobile communication operator to the emergency communication network deployment area, and use default LTE protocol parameters; and the network deployment unit is configured to obtain cell deployment information of eNodeBs in the emergency communication network, and number cells as a first cell, a second cell, and a third cell respectively.
3. The LTE maritime emergency communication system based on a USV eNodeB system according to claim 1 or 2, wherein numbered cell deployment information comprises: a division of central areas and edge areas of the network cells, sizes of edge overlapping areas of neighboring network cells, omnidirectional antenna angle setting data.
4. The LTE maritime emergency communication system based on a USV eNodeB system according to claim 1 or 2 or 3, wherein if a user is located in an edge overlapping area of neighboring cells in the emergency communications network deployment area, the emergency communications network deployment area is configured to use limited power for transmission in the overlapping area; or if a user is located in a central area of a cell in the emergency communications network deployment area, the emergency communications network deployment area is configured to use full power for transmission in the area; and the transmit power may be adjusted properly according to an actual signal-to-noise ratio.
5. The LTE maritime emergency communication system based on a USV eNodeB system according to claim 1 or 2 or 3 or 4, wherein the virtual power positioning and anchor control unit is configured to dynamically adjust the division of the central areas and edge areas of the network cells in the emergency communication network deployment area according to distribution of users and services of the users, system load, and real-time locations of USVs.
6. The LTE maritime emergency communication system based on a USV eNodeB system according to claim 1 or 2 or 3 or 4 or 5, wherein the network deployment unit is configured to determine the overlapping areas of the neighboring cells in the emergency communication network deployment area according to real-time location information fed back by a GPS on each eNodeB and a radius of each network cell; or the network deployment unit is configured to determine the overlapping areas of the neighboring cells in the emergency communication network deployment area according to actual reference signal received power or paging signal strength in the network cells in the emergency communication network deployment area.
7. The LTE maritime emergency communication system based on a USV eNodeB system according to claim 1 or 2 or 3 or 4 or 5 or 6, wherein the virtual power positioning and anchor control unit is configured to control a distance between USV sub-clusters according to a flow velocity and direction of a sea current and the overlapping areas of the neighboring network cells, wherein when the parent-node USV moves due to an impact of the sea current, the virtual power positioning and anchor control unit is configured to enter an instruction to a propeller according to GPS information on the eNodeB, so that the eNodeB on the parent-node USV stays in the specified position; and when the parent-node USV dynamically stays in the specified position, the virtual power positioning and anchor control unit is configured to transmit a move instruction to a virtual power positioning and anchor control unit in the USV sub-cluster according to the overlapping areas of the neighboring network cells and obtained GPS information of an eNodeB in the USV sub-cluster to control a propeller in the USV sub-cluster, so that the effective distance between eNodeBs on the USVs is controlled.
8. The LTE maritime emergency communication system based on a USV eNodeB system according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7, wherein the eNodeB, a power supply module, and the virtual power positioning and anchor control unit disposed in the USV sub-cluster have the same functions as the parent-node USV, and constitute the USV eNodeB system with the parent-node USV, wherein by using the LTE technology and the licensed spectrum or the TV white space of the operator, the eNodeB implements mutual communication in the USV eNodeB system, and implements licensed spectrum coverage of the mobile communication operator in the emergency communication network deployment area; a solar panel, a storage battery, and a fuel power generation system used as a hybrid power supply are disposed in the power supply module, wherein the USV cluster is configured to sail in the specified position, the solar panel is configured to be unrolled and start to work after the USV cluster sails in the specified position; and the virtual power positioning and anchor control unit is configured to control the propeller in the USV sub-cluster according to the move instruction transmitted by the parent-node USV, and feed back the GPS information to the parent-node USV, so that the effective distance between eNodeBs in the USV cluster is controlled.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711083600.9A CN107707292B (en) | 2017-11-07 | 2017-11-07 | LTE (Long term evolution) offshore emergency communication system based on unmanned ship base station networking |
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| GB201802192D0 GB201802192D0 (en) | 2018-03-28 |
| GB2568122A GB2568122A (en) | 2019-05-08 |
| GB2568122B true GB2568122B (en) | 2019-11-13 |
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| US11290942B2 (en) | 2020-08-07 | 2022-03-29 | Rockwell Collins, Inc. | System and method for independent dominating set (IDS) based routing in mobile AD hoc networks (MANET) |
| US11665658B1 (en) | 2021-04-16 | 2023-05-30 | Rockwell Collins, Inc. | System and method for application of doppler corrections for time synchronized transmitter and receiver |
| US11726162B2 (en) | 2021-04-16 | 2023-08-15 | Rockwell Collins, Inc. | System and method for neighbor direction and relative velocity determination via doppler nulling techniques |
| US12032081B2 (en) | 2021-04-16 | 2024-07-09 | Rockwell Collins, Inc. | System and method for application of doppler corrections for time synchronized transmitter and receiver |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN107707292A (en) | 2018-02-16 |
| GB201802192D0 (en) | 2018-03-28 |
| CN107707292B (en) | 2023-10-27 |
| GB2568122A (en) | 2019-05-08 |
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