CN109474917B - Road side equipment RSU and system configuration method thereof - Google Patents
Road side equipment RSU and system configuration method thereof Download PDFInfo
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- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract
The invention discloses a road side equipment RSU, which comprises a host and a radio frequency unit; the host is used for acquiring configuration information of the system about short-distance communication, configuring each radio frequency unit according to the configuration information, configuring each radio frequency unit into different channels and frequencies respectively, and maintaining a communication link with each radio frequency unit; and the radio frequency unit is used for broadcasting system information and communicating with the OBU by adopting the configured channel and frequency. The invention solves the problems of single RSU channel, low communication efficiency and poor communication safety and reliability in the prior art. The invention also discloses a system configuration method of the RSU.
Description
Technical Field
The invention relates to a road side equipment RSU and a system configuration method thereof.
Background
With the development of intelligent traffic management and car networking technologies, roadside equipment (or called a roadside Unit, a Road Side Unit, or an RSU) and a vehicle-mounted terminal (or called a vehicle-mounted Unit, an On Board Unit, or an OBU) in an intelligent traffic management system communicate in a short-distance communication mode, so that functions of vehicle identity identification, electronic fee deduction, no parking or card fetching, establishment of an unattended vehicle channel and the like are realized.
Because the number of vehicles on a road is generally large, the situation that one RSU needs to communicate with a plurality of OBUs is very common, how to well ensure that the communication between the RSU and the plurality of OBUs can not interfere with each other and conflict with each other, and how to accurately and efficiently complete the information interaction between the RSU and the OBUs becomes a technical problem to be solved urgently in an intelligent traffic management system.
Disclosure of Invention
In view of the technical defects and technical drawbacks in the prior art, embodiments of the present invention provide a road side unit RSU and a system configuration method thereof, which overcome the above problems or at least partially solve the above problems.
As an aspect of the embodiments of the present invention, an RSU includes a host and a radio frequency unit;
the host is used for acquiring configuration information of the system about short-distance communication, configuring each radio frequency unit according to the configuration information, configuring each radio frequency unit into different channels and frequencies respectively, and maintaining a communication link with each radio frequency unit;
and the radio frequency unit is used for broadcasting system information and communicating with the OBU by adopting the configured channel and frequency.
In one embodiment, the host may include a radio frequency unit management module and a data processing module;
the radio frequency unit management module is used for acquiring locally stored configuration information about short-distance communication or receiving the configuration information about short-distance communication from an upper computer, configuring each radio frequency unit according to the configuration information, and configuring each radio frequency unit into different channels and frequencies respectively;
and the data processing module is used for maintaining a communication link with each radio frequency unit and processing transmission data between the radio frequency units.
In one embodiment, the radio unit management module may include a radio unit management component and a channel management component;
the radio frequency unit management component is used for acquiring locally stored configuration information about short-distance communication or receiving configuration information about short-distance communication from an upper computer;
the channel management component is configured to configure each radio frequency unit according to a configuration message, and configure each radio frequency unit into different channels and frequencies respectively.
In one embodiment, the radio frequency unit may include a configuration channel module, a communication link management module, and a service data processing module;
the configuration channel module is used for completing channel configuration of the radio frequency unit according to a channel configuration result distributed by the host;
the communication link management module is used for maintaining a communication link with the host computer and/or maintaining a communication link established with the OBU;
and the service data processing module is used for processing the service data with the host and/or processing the service data with the OBU.
In an embodiment, the host is specifically configured to set parameters of each radio frequency unit, complete channel definition and configuration for the radio frequency unit, and/or dynamically adjust channel configuration of the radio frequency unit according to at least one of the following information: the number of the OBUs in the coverage area, the distribution condition of the OBUs, the communication quality, the communication requirement and channel configuration information issued by the upper computer.
In an embodiment, the radio frequency unit is specifically configured to:
and sending a system message through a broadcast control channel, receiving a required communication frequency point and a required communication channel determined by the OBU according to the system information, and establishing communication connection with the OBU by adopting the received frequency point and the received communication channel.
In one embodiment, the host may connect and exchange data with the radio frequency unit by using a data bus according to a predetermined communication protocol.
As another aspect of the embodiment of the present invention, a system configuration method for a road side device RSU is provided, including:
the method comprises the following steps that a host of an RSU (remote subscriber Unit) acquires configuration information of a system about short-distance communication, configures radio frequency units according to the configuration information, configures the radio frequency units into different channels and frequencies respectively, and maintains communication links with the radio frequency units;
and the radio frequency unit of the RSU broadcasts system information and communicates with the OBU according to the configured channel and frequency.
In an embodiment, in the system configuration method of the RSU, the obtaining, by the host of the RSU, configuration information of the system about short-range communication specifically includes: the host acquires locally stored configuration information on short-range communication or receives configuration information on short-range communication from a host computer
In one embodiment, the system configuration method of the RSU may further include: the radio frequency unit broadcasts system information and communicates with an on-board terminal (OBU) according to configured channels and frequencies, and the radio frequency unit specifically comprises: the radio frequency unit completes channel configuration according to a channel configuration result distributed by the host;
maintaining a communication link with the host and/or maintaining a communication link established with the OBU; and
and processing the service data with the host and/or processing the service data with the OBU.
In an embodiment, the system configuration method of the RSU may be that the configuring the radio frequency unit specifically includes: the host machine completes the channel definition and configuration of the radio frequency unit by setting parameters of each radio frequency unit, and/or dynamically adjusts the channel configuration of the radio frequency unit according to at least one of the following information: the number of the OBUs in the coverage area, the distribution condition of the OBUs, the communication quality, the communication requirement and channel configuration information issued by the upper computer.
In an embodiment, the system configuration method of the RSU, the broadcasting the system information and communicating with the on-board terminal OBU, specifically includes: and sending a system message through a broadcast control channel, receiving a required communication frequency point and a required communication channel determined by the OBU according to the system information, and establishing communication connection with the OBU by adopting the received frequency point and the received communication channel for communication.
In one embodiment, the system configuration method of the RSU may further include: and the host is connected with the radio frequency unit and exchanges data by adopting a data bus mode according to a preset communication protocol.
The embodiment of the invention at least realizes the following technical effects:
the RSU comprises the host and the radio frequency units, each radio frequency unit is configured through the host, the multi-channel communication design of the RSU in short-distance communication is effectively achieved, the multi-channel communication design can effectively achieve anti-collision and anti-interference when the RSU and the OBUs communicate simultaneously, the multi-channel communication design greatly improves the communication capacity of the RSU, and the influence of the RSU on a short-distance communication system due to the fact that the communication capacity of the RSU is increased instantly in the short-distance communication is well met. The host configures the channel and the frequency of the radio frequency unit, plans the channel and schedules the communication, and can greatly improve the communication efficiency of short-distance communication.
The radio frequency units of the RSU of the road side equipment provided by the invention are respectively communicated with the OBUs of the vehicle-mounted terminal, and each OBU is communicated on a channel and frequency determined by a field, so that mutual interference in communication can be avoided or reduced, the fault tolerance of a short-distance communication system is improved, the communication efficiency is improved, and the communication is efficient, accurate, safe and reliable.
The RSU of the road side equipment can dynamically adjust the channel configuration of the radio frequency unit through the host, so that the channel frequency and the channel code can be flexibly configured and optimized according to different communication conditions, the communication efficiency is further improved, and the accuracy of communication is ensured.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of an RSU according to an embodiment of the present invention;
fig. 2 is a schematic system structure diagram of an RSU according to an embodiment of the present invention;
fig. 3 is a schematic flow chart illustrating communications between an RSU and an OBU according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an RSU and an OBU communicating according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Various specific embodiments of a road side unit RSU and a system configuration method thereof according to an embodiment of the present invention are described in detail below.
The first embodiment is as follows:
referring to fig. 1 and 4, a roadside device (also called a roadside unit, RSU) according to a first embodiment of the present invention includes a host 1 and a radio frequency unit 2;
the host 1 is configured to acquire configuration information of the system about short-distance communication, configure each radio frequency unit 2 according to the configuration information, configure each radio frequency unit 2 into different channels and frequencies, and maintain a communication link with each radio frequency unit 2;
the radio frequency unit 2 is configured to broadcast system information and communicate with a vehicle-mounted terminal (also referred to as a vehicle-mounted unit, OBU)3 by using a configured channel and frequency.
The RSU provided by the embodiment of the invention comprises the host and the plurality of radio frequency units, and each radio frequency unit is configured through the host, so that the multi-channel communication design of the RSU in short-distance communication is effectively realized, the multi-channel communication design can greatly improve the communication capacity of the RSU, and the influence of the increase of the instantaneous communication capacity in the short-distance communication on a short-distance communication system is well dealt with. The host configures the channel and the frequency of the radio frequency unit, plans the channel and schedules the communication, and can greatly improve the communication efficiency of short-distance communication.
According to the embodiment of the invention, each radio frequency unit of the RSU of the road side equipment respectively communicates with each OBU of the vehicle-mounted terminal, so that the communication efficiency is improved, meanwhile, the mutual interference in the communication can be avoided or reduced, the fault tolerance of a short-distance communication system is improved, and the communication is efficient, accurate, safe and reliable.
Referring to fig. 2, in one embodiment, the host 1 may include a radio frequency unit management module 101 and a data processing module 102;
the radio frequency unit management module 101 is configured to obtain locally stored configuration information about short-range communication or receive configuration information about short-range communication from an upper computer, configure each radio frequency unit 2 according to configuration information, and configure each radio frequency unit 2 into different channels and frequencies respectively;
the data processing module 102 is configured to maintain a communication link with each radio frequency unit 2, and process transmission data with the radio frequency unit 2.
Specifically, the radio frequency unit management module 101 may include a radio frequency unit management component 1011 and a channel management component 1012;
the radio frequency unit management component 1011 is configured to obtain locally stored configuration information about short-range communication or receive configuration information about short-range communication from an upper computer;
the channel management component 1012 is configured to configure each radio frequency unit 2 according to a configuration message, and configure each radio frequency unit 2 into different channels and frequencies respectively.
Referring to fig. 2, in one embodiment, the radio frequency unit 2 may include a configuration channel module 201, a communication link management module 202, and a service data processing module 203;
a channel configuration module 201, configured to complete channel configuration of the radio frequency unit 2 according to a channel configuration result allocated by the host 1;
a communication link management module 202 for maintaining a communication link with host 1 and/or maintaining an established communication link with OBU 3;
and the service data processing module 203 is used for processing service data with the host 1 and/or processing service data with the OBU 3.
In an embodiment, the host 1 is specifically configured to set parameters of each radio frequency unit, complete channel definition and configuration for the radio frequency unit 2, and maintain a communication link with each radio frequency unit to perform data communication.
In an embodiment, the host 1 may further dynamically adjust, during the system operation, a channel configuration of the radio frequency unit 2 according to at least one of the following information: the number of the OBUs 3 in the coverage area, the distribution condition of the OBUs 3, the communication quality, the communication requirement and channel configuration information issued by the upper computer. And the host maintains a communication link with each radio frequency unit according to the adjusted channel configuration information of the radio frequency unit to carry out data communication.
The RSU of the road side equipment can dynamically adjust the channel configuration of the radio frequency unit through the host, so that the channel frequency and the channel code can be flexibly configured and optimized according to different communication conditions, the communication efficiency is further improved, and the accuracy of communication is ensured.
In an embodiment, the radio frequency unit 2 may be specifically configured to:
and sending a system message through a broadcast control channel, receiving a required communication frequency point and a required communication channel determined by the OBU according to the system information, and establishing communication connection with the OBU by adopting the received frequency point and the received communication channel.
Specifically, the system information sent by the radio frequency unit through the broadcast control channel may include: frequency point information, control information, encryption information, communication codes, and the like.
In a specific embodiment, the signal of the broadcast control channel should be stronger than other channels, and the frequency point of the broadcast control channel is fixed.
In one embodiment, the host may connect and exchange data with the radio frequency unit by using a data bus according to a predetermined communication protocol.
In the RSU provided in the embodiment of the present invention, the connection and data exchange between the host and the radio frequency unit may be performed in various data bus manners, and a specific data bus manner may be selected by those skilled in the art as needed in the prior art, and the host manages and acquires data from a plurality of radio frequency units through the data bus; the host may use a dedicated or general communication protocol for control and data exchange with the rf units, which may be the manner commonly used by those skilled in the art.
In one embodiment, the RSU may further include other modules, such as: the display output module can be connected with an external display screen through the display output module to carry out display output so as to be applied to the roadside large-screen display function.
Referring to fig. 4, a host of the RSU performs connection data exchange with a plurality of radio units, radio unit # 1 communicates with OBU apparatus # 1 via communication channel CH1, radio unit # 2 communicates with OBU apparatus # 2 via communication channel CH2, radio unit # k communicates with OBU apparatus # k via communication channel CHk, and the RSU performs data communication with different OBUs via each radio unit.
Example 2:
referring to fig. 1 to 4, an embodiment of the present invention further provides a system configuration method for the RSU, including:
the host 1 of the RSU acquires the configuration information of the system about short-distance communication, configures the radio frequency units 2 according to the configuration information, configures each radio frequency unit 2 into different channels and frequencies respectively, and maintains a communication link with each radio frequency unit 2;
the radio unit 2 of the RSU broadcasts system information and communicates with the OBU3 depending on the configured channel and frequency.
In an embodiment, the system configuration method of the RSU, where the obtaining, by the host of the RSU, configuration information of the system about short-range communication specifically includes: the host 1 acquires locally stored configuration information on short-range communication or receives configuration information on short-range communication from a host computer.
In an embodiment, the system configuration method of the RSU, where the radio frequency unit broadcasts system information and communicates with the on-board terminal OBU according to the configured channel and frequency, specifically includes:
the radio frequency unit 2 completes channel configuration according to the channel configuration result distributed by the host 1;
maintaining a communication link with host 1 and/or maintaining an established communication link with OBU 3; and
processing traffic data with the host 1 and/or processing traffic data with the OBU 3.
In an embodiment, the system configuration method of the RSU may be that the configuring the radio frequency unit specifically includes: the host 1 completes the channel definition and configuration of the radio frequency unit 2 by setting parameters of each radio frequency unit, and/or dynamically adjusts the channel configuration of the radio frequency unit 2 according to at least one of the following information: the number of the OBUs 3 in the coverage area, the distribution condition of the OBUs 3, the communication quality, the communication requirement and channel configuration information issued by the upper computer.
In an embodiment, the system configuration method of the RSU, where the broadcasting the system information and the communicating with the on-board terminal OBU, specifically includes:
the system information is sent through the broadcast control channel, the required communication frequency point and channel determined by the OBU3 according to the system information are received, and the communication connection is established between the OBU3 and the received frequency point and channel for communication.
In one embodiment, the system configuration method of the RSU may further include: the host 1 is connected and exchanges data with the radio frequency unit 2 in a data bus mode according to a predetermined communication protocol.
Example 3:
referring to fig. 1 to 4, a communication process between a roadside device RSU and a vehicle-mounted terminal OBU according to an embodiment of the present invention may include the following steps:
s1: after finishing channel and frequency configuration according to configuration information of the host 1, the radio frequency unit 2 of the RSU starts information transmission, performs data broadcasting, and transmits system messages including all frequency point information, control information, encryption information, communication codes and the like through a control channel of the RSU;
s2: the OBU3 is entering RSU coverage and receives broadcast information for the control channel;
s3: the OBU3 calculates the received information according to a preset rule, and then sets the OBU3 to a required communication frequency point and a required channel;
specifically, the OBU3 may determine the frequency point according to the frequency point information and the control information included in the received broadcast information and according to its own identification ID, that is, the OBU _ ID and the RSU _ ID, to obtain communication parameter setting information including frequency point information, a communication channel, time information, and a communication code;
s4: the radio frequency unit 2 of the RSU receives the access information containing the communication parameter setting information sent by the OBU3, performs data communication with the host 1, performs access authentication and corresponding communication scheduling by the host 1, and establishes and maintains a communication link with the OBU3 through the radio frequency unit 3;
s5: the RSU is communicated with the OBU3 for data processing;
s6: after the communication with the OBU3 is completed, the RSU sends a sleep instruction to the OBU 3;
s7: and the OBU receives the sleep instruction and executes the sleep.
In a specific embodiment, the communication process between the road side device RSU and the vehicle-mounted terminal OBU may further include the following steps:
s8: the RSU sends a wake up command to the OBU3 that performed the sleep to resume operation of the OBU.
In the road side device RSU provided in the embodiments of the present invention, during the whole operation process, the host of the RSU may adjust the communication channel and the code according to a preset rule or information including the upper system and the OBU, and send the communication channel and the code to the outside through the control channel. Therefore, synchronous data communication of a plurality of OBUs is realized. If necessary, the host of the RSU may reconfigure each radio frequency unit according to a predetermined algorithm, a communication requirement, information analysis of the on board terminal OBU, or a channel configuration issued by the upper system on the management side.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. A road side equipment RSU is characterized by comprising a host and a radio frequency unit;
the host is used for acquiring configuration information of the system about short-distance communication, configuring each radio frequency unit according to the configuration information, configuring each radio frequency unit into different channels and frequencies respectively, maintaining a communication link with each radio frequency unit and processing transmission data between the radio frequency units;
the radio frequency unit is used for sending system information through a broadcast control channel by adopting a configured channel and frequency, receiving a required communication frequency point and channel determined by the OBU according to the system information, and establishing communication connection with the OBU by adopting the received frequency point and channel;
the host comprises a radio frequency unit management module and a data processing module;
the radio frequency unit management module is used for acquiring locally stored configuration information about short-distance communication or receiving configuration information about short-distance communication from an upper computer, configuring each radio frequency unit according to configuration information, and configuring each radio frequency unit into different channels and frequencies respectively;
the data processing module is used for maintaining a communication link with each radio frequency unit and processing transmission data between the radio frequency units;
the radio frequency unit management module comprises a radio frequency unit management component and a channel management component;
the radio frequency unit management component is used for acquiring locally stored configuration information about short-distance communication or receiving configuration information about short-distance communication from an upper computer;
the channel management component is used for configuring each radio frequency unit according to a configuration message and configuring each radio frequency unit into different channels and frequencies respectively;
the radio frequency unit comprises a configuration channel module, a communication link management module and a service data processing module;
the configuration channel module is used for completing channel configuration of the radio frequency unit according to a channel configuration result distributed by the host;
the communication link management module is used for maintaining a communication link with the host computer and/or maintaining a communication link established with the OBU;
and the service data processing module is used for processing service data with the host and/or processing service data with the OBU.
2. The RSU of claim 1, wherein the host is configured to set parameters of the rf units, perform channel definition and configuration for the rf units, and/or dynamically adjust channel configuration of the rf units according to at least one of the following information: the number of OBUs in a coverage area, the distribution condition of the OBUs, communication quality, communication requirements and channel configuration information issued by an upper computer;
the host is also used for connecting and exchanging data with the radio frequency unit in a data bus mode according to a preset communication protocol.
3. A system configuration method of a roadside apparatus RSU, the system configuration method being applied to the roadside apparatus RSU claimed in any one of claims 1 to 2, comprising:
the RSU host acquires configuration information of the system about short-distance communication, configures the radio frequency units according to the configuration information, configures each radio frequency unit into different channels and frequencies respectively, maintains a communication link with each radio frequency unit, and processes transmission data between the radio frequency units;
and the radio frequency unit of the RSU sends system information through a broadcast control channel according to the configured channel and frequency, receives the required communication frequency point and channel determined by the OBU according to the system information, and establishes communication connection with the OBU by adopting the received frequency point and channel.
4. The system configuration method of the RSU of claim 3, wherein the obtaining of the configuration information of the system about the short-range communication by the host of the RSU specifically comprises:
the host acquires locally stored configuration information on short-range communication or receives configuration information on short-range communication from the upper computer.
5. The system configuration method of the RSU of claim 3, wherein the rf unit broadcasts the system information and communicates with the OBU according to the configured channel and frequency, and specifically comprises:
the radio frequency unit completes channel configuration according to a channel configuration result distributed by the host;
maintaining a communication link with the host and/or maintaining a communication link established with the OBU; and
and processing the service data with the host and/or processing the service data with the OBU.
6. The system configuration method of the RSU of claim 3, wherein the configuring the rf unit specifically comprises:
the host machine completes the channel definition and configuration of the radio frequency unit by setting parameters of each radio frequency unit, and/or dynamically adjusts the channel configuration of the radio frequency unit according to at least one of the following information: the number of the OBUs in the coverage area, the distribution condition of the OBUs, the communication quality, the communication requirement and channel configuration information issued by the upper computer.
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| CN110213727B (en) * | 2019-06-24 | 2021-04-27 | 腾讯科技（深圳）有限公司 | Charging pile information management method and related device |
| CN110689634B (en) * | 2019-11-26 | 2021-12-14 | 交通运输部路网监测与应急处置中心 | Communication method suitable for truck ETC lane system and lane system |
| CN110910521B (en) * | 2019-11-26 | 2022-02-22 | 交通运输部路网监测与应急处置中心 | Communication method and device for ETC lane controller end and storage medium |
| CN113542018A (en) * | 2021-07-01 | 2021-10-22 | 东风悦享科技有限公司 | OTA (over the air) upgrading system and method based on V2X |
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| CN105072589A (en) * | 2015-08-11 | 2015-11-18 | 深圳市金溢科技股份有限公司 | Wide-area Internet of Things base station data transmission method and wide-area Internet of Things base station |
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| CN103780324A (en) * | 2014-03-04 | 2014-05-07 | 南通大学 | Dynamic spectrum access method |
| CN104167164A (en) * | 2014-07-29 | 2014-11-26 | 上海景逸电子科技有限公司 | Multi-channel wireless radio system |
| CN105072589A (en) * | 2015-08-11 | 2015-11-18 | 深圳市金溢科技股份有限公司 | Wide-area Internet of Things base station data transmission method and wide-area Internet of Things base station |
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