CN103763345A - Vehicle networking system based on IEEE 802.16 protocol and communication method - Google Patents
Vehicle networking system based on IEEE 802.16 protocol and communication method Download PDFInfo
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- CN103763345A CN103763345A CN201310751774.3A CN201310751774A CN103763345A CN 103763345 A CN103763345 A CN 103763345A CN 201310751774 A CN201310751774 A CN 201310751774A CN 103763345 A CN103763345 A CN 103763345A
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Abstract
The invention relates to a vehicle networking system based on an IEEE 802.16 protocol. The system comprises a vehicle-mounted terminal and a channel module, wherein the vehicle-mounted terminal comprises a vehicle-mounted transmitting terminal, a vehicle-mounted receiving terminal and a vehicle-mounted relay terminal, the vehicle-mounted transmitting terminal is provided with multiple OFDM transmission subsystems with different frame structures, the channel module is provided with an AWGN channel or a frequency selective fading channel, the vehicle-mounted receiving terminal corresponds to an OFDM receiving subsystem of the vehicle-mounted transmitting terminal, and the vehicle-mounted relay terminal is a middle processing process subsystem of the vehicle-mounted transmitting terminal and the vehicle-mounted receiving terminal. The system can further verify communication performance of an algorithm in a network, improve a physical layer technique of the vehicle networking system in a networking state, and further improve reliability of network performance.
Description
Technical field
The present invention relates to field of wireless communications systems, particularly car networked system and the communication means based on IEEE802.16 agreement.
Background technology
At WiMAX(Worldwide Interoperability for Microwave Access micro-wave access global inter communication) there is a kind of network without Centroid in network, be called Mesh network, i.e. WMN(Wireless Mesh Network wireless mesh network).Exactly because the day by day prosperities of feature such as Mesh network Qi Wu center, self-organizing are got up, be applied to gradually the situations such as building office, temporary meeting, emergency communication, car networking.Its physical-layer techniques adopts chnnel coding, optional data modulation scheme and OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technology
The research of mobile ad-hoc network and wireless sensor network aspect is existing a lot, starts from the end of last century, and has obtained the application achievement of a lot of reality, but be also in the starting stage for the research of In-vehicle networking for the research of intelligent transportation system.Vehicle and means of transportation that car is networked in movement are node, utilize wireless communication technique, form action net.Add the vehicle of this network, can become a radio node, or wireless routing.Automobile within the specific limits, connected to each other, form a large-scale network.Vehicle can add or leave, and sets up new mobile Internet.
The physical layer of IEEE802.16 agreement not only can be supported single carrier but also can support multicarrier, supports multicarrier to support OFDM technology.Physical layer specification based on single carrier is divided into again two kinds of WirelessMAN-SC and WirelessMAN-SCa.The operation frequency range of WirelessMAN-SC is 10～66GHz, and is sighting distance (LOS) operation; And the operation frequency range of WirelessMAN-SCa is lower than 11GHz, it is non line of sight (NLOS) operation.Physical layer specification based on multicarrier is divided into WirelessMAN-OFDM and WirelessMAN-OFDMA, and two kinds of standards are all based on OFDM multi-transceiver technology, and operation frequency range is all lower than 11GHz.
Along with development and the extensive use of broadband wireless communication technique, broadband wireless ad-hoc network is significant for the communication of car networking.The car networking that broadband wireless MANET forms, mainly refer to the wireless device being loaded on vehicle, realize the structure of broadband self-organizing network, there is the scale of can expanding, high fault tolerance, self-organizing, easily set up, can quickly networking under emergency case etc. many advantages, will bring major transformation to the car radio communication of networking.
Summary of the invention
The present invention builds the agreement based on IEEE802.16, at the get off Mesh network topology physical layer system framework of networked system of tdd mode, for video and audio business and the non real-time data service of real-time, multiple nodes are realized communication, inter-node communication can be by the mode of single-hop, also can be by the mode of multi-hop.In addition, design is adapted to the frame format of broadband self-organizing car connected network communication system.Different business demands and different protocol transmission have different frame formats, do not carry out complete customization in agreement, and this is also one of important content of completing of the present invention.
Object of the present invention is achieved through the following technical solutions:
Car networked system based on IEEE802.16 agreement comprises car-mounted terminal, channel module, described car-mounted terminal comprises vehicle transmitting terminal, vehicle-mounted receiving terminal and vehicle-mounted link terminal, described vehicle transmitting terminal has multiple OFDM transmission subsystems of different frame structures, described channel module has awgn channel or frequency selective fading channels, described vehicle-mounted receiving terminal is corresponding to the OFDM receiving subsystem of vehicle transmitting terminal, the intermediate treatment process subsystem that described vehicle-mounted link terminal is vehicle transmitting terminal and vehicle-mounted receiving terminal;
Described vehicle transmitting terminal and vehicle-mounted receiving terminal are by direct communication mode, or vehicle-mounted link terminal communication, vehicle-mounted link terminal is only forward node mode, or vehicle-mounted link terminal of vehicle-mounted link terminal communication while sends own information mode to vehicle-mounted receiving terminal transmission data;
Vehicle-mounted receiving terminal receives after data, the data that judgement receives, if adopt direct communication between terminals, vehicle-mounted receiving terminal directly carries out OFDM demodulation, equilibrium, QPSK demodulation, channel-decoding;
If be only forward node by the communication vehicle carried link terminal of vehicle-mounted link terminal, if there is relaying diversity, reception data carried out to equal gain combining processing and then carry out OFDM demodulation, equilibrium, QPSK demodulation, channel-decoding; If without diversity, directly carry out OFDM demodulation, equilibrium, QPSK demodulation, channel-decoding;
If send own information by vehicle-mounted vehicle-mounted link terminal of link terminal communication while, receiving terminal, by control information information extraction, then carries out respectively subsequent treatment.
Described system onboard launch terminal is exported data by information source, and output data form armed burst through chnnel coding, QPSK modulation, OFDM modulation.
The invention has the advantages that:
The present invention can realize the technical support to upper layer network framework based on physical-layer techniques in self-organizing network, for different traffic carrying capacitys and communication scenes (user passes through multi-hop mode to user's direct communication or user), carries out group-net communication.System of the present invention is the communication performance of verification algorithm under network further, improves physical-layer techniques under car networked system networking situation, further improved the reliability of network performance.
Accompanying drawing explanation
Fig. 1 is entire system structure chart of the present invention;
Fig. 2-4th, tri-kinds of frame assumption diagrams of Mesh of framework of the present invention;
Fig. 5 is the simulation model under different business amount of the present invention;
Fig. 6 is vehicle transmitting terminal of the present invention and vehicle-mounted receiving terminal direct communication physical layer simulation model;
Fig. 7 is vehicle transmitting terminal by link terminal and vehicle-mounted receiving terminal without diversity communication physical layer simulation model, and vehicle-mounted link terminal only has relay forwarding function;
Fig. 8 is that vehicle transmitting terminal has diversity communication physical layer simulation model by link terminal and vehicle-mounted receiving terminal, and vehicle-mounted link terminal only has relay forwarding function;
Fig. 9 be vehicle transmitting terminal by link terminal and vehicle-mounted receiving terminal communication physical layer simulation model, vehicle-mounted link terminal sends own information simultaneously.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.Fig. 1 is entire system structure chart of the present invention.This system comprises following a few part.
Vehicle transmitting terminal: multiple OFDM transmission subsystems with different frame structures;
Channel module: awgn channel or frequency selective fading channels;
Vehicle-mounted receiving terminal: corresponding to the OFDM receiving subsystem of transmitting terminal;
Vehicle-mounted link terminal: the intermediate treatment process subsystem of transmitting terminal and receiving terminal.
Above-mentioned modules is with " the vehicle-mounted receiving terminal of vehicle transmitting terminal-> channel-> ", or the mode of " the vehicle-mounted receiving terminal of the vehicle-mounted link terminal-> of vehicle transmitting terminal-> channel-> " realizes communication, data flow is specifically described as follows.
Vehicle transmitting terminal is exported data (data format is every frame 384bit, 768bit, 1920bit) by information source, and output data form armed burst through chnnel coding, QPSK modulation, OFDM modulation.Corresponding different traffic carrying capacity and the frame structures of different pieces of information amount that information source produces.
The mode that the data of vehicle transmitting terminal arrive receiving terminal is that networking mode mainly contains three kinds: direct communication between vehicle transmitting terminal-vehicle-mounted receiving terminal, vehicle transmitting terminal-vehicle-mounted receiving terminal is only forward node by the communication vehicle carried link terminal of vehicle-mounted link terminal, and vehicle transmitting terminal-vehicle-mounted receiving terminal sends own information by vehicle-mounted vehicle-mounted link terminal of link terminal communication while.Data merging mode in the third mode is time division multiple access.
Vehicle-mounted receiving terminal receives after data, and the data that first judgement receives are to adopt which kind of mode to communicate by letter (being mainly to be indicated by control information), determines that communication mode carries out subsequent treatment by data afterwards.
If direct communication between terminal, vehicle-mounted receiving terminal carries out OFDM demodulation, equilibrium, QPSK demodulation, channel-decoding.
If be only forward node by via node communication repeating node between source-destination node, if there is relaying diversity, reception data carried out to equal gain combining processing and then carry out OFDM demodulation, equilibrium, QPSK demodulation, channel-decoding; If without diversity, directly carry out OFDM demodulation, equilibrium, QPSK demodulation, channel-decoding.
If vehicle transmitting terminal-vehicle-mounted receiving terminal sends own information by via node communication while via node, receiving terminal, by control information information extraction, then carries out respectively subsequent treatment.
The network configuration based on IEEE802.16 agreement Internet of things system under Mesh pattern that the present invention proposes is corresponding to the frame structure design under different business amount.
The frame structure with control burst for data burst proposing according to agreement, designs the frame structure under different business amount in conjunction with practical communication is existing.For audio frequency, the video traffic of real-time transmission; the data volume of general transmission is less; but the time delay that real-time of having relatively high expectations less; require lower error code simultaneously; this design for frame structure is generally designed to shorter burst; be that each slot transmission data volume is less, need to increase unnecessary expense redundancy protecting.For the data service of non real-time property transmission, it is less to requirement of real-time, but generally has larger data volume, needs higher efficiency of transmission, and this design for frame structure is generally designed to the burst of growing, and improves transmission rate and efficiency of transmission.
For data burst, in IEEE802.16 agreement, each physical slot by time is defined as 7 OFDM symbols, and under tdd mode, each physical slot by time need to have 1-2 leading symbol, and protection symbol.For different control informations, corresponding control burst can be transmitted maximum amount of data and be no more than 960bit, for guaranteeing mass of system, designs 2 leading symbols and at least one protection symbol, and largest data transfer amount is no more than 768bit like this.Design three kinds of structures: 1. data volume is 192bit integral multiple, contain 1 protection symbol; 2. data volume, for being less than arbitrarily 768bit data, contains 1 protection symbol; 3. data message is 192bit integral multiple, contains 2-3 protection symbol.
For controlling burst; in IEEE802.16 agreement, do not do concrete regulation; but while considering the more data symbol of each slot transmission; because channel time-varying characteristics can affect systematic function; and the transmission rate of the assignment affects system of data slot; therefore each slot transmission valid data amount of data burst can not be too large; can not be too little; can be according to concrete scene to its corresponding data burst structure of the requirements set of traffic carrying capacity; main consideration 768bit and two kinds of data business volumes of 1920bit in the present invention, all contain 2 leading symbols and 1 protection symbol in frame structure.Concrete frame structure is as shown in key diagram 2-4.
In addition, business also claims to network model for the requirement of real-time.The less time delay of service needed that real-time is higher, according to transmission range, realizes point-to-point communication as far as possible, and when transmission range is far away, the jumping figure of multi-hop transmission is also Consideration.For non-real time service, need higher efficiency of transmission, the cooperative relay system so with diversity gain has higher efficiency of transmission.The non-this patent of MAC layer scheduling algorithm wherein relating to is invented related content, does not therefore consider dispatching algorithm, and the traffic carrying capacity task of transmitting is the data of MAC after scheduling, and the present invention only relates to the networking of transmission.
Different traffic models are as shown in Fig. 5-6.The difference of traffic carrying capacity be mainly reflected in data source send data bit difference and receiving terminal flexible and changeable to the parsing of variable frame structure, this is mainly determined by upper strata control message content, by upper strata control information control physical layer mechanism, from the angle of theoretical research, be exactly choice structure in fact.Build in system and select to control by embedding functional module, realizing.
Build the communication scenes relating in system and mainly contain three kinds: terminal room directly carries out point-to-point communication; Between vehicle transmitting terminal and vehicle-mounted receiving terminal, by vehicle-mounted link terminal, communicate by letter, vehicle-mounted link terminal only plays the effect of forwarding; Terminal is communicated by letter by vehicle-mounted link terminal, vehicle-mounted link terminal both can be used as forward relay node, also can be used as vehicle transmitting terminal-vehicle-mounted receiving terminal, when this end message of transmission forwards other information simultaneously, the merging of data adopts the mode of time division multiple access.
During direct communication between terminals, fairly simple, do not relate to overlying roaduay by and collision problem, transmitting terminal arrives receiving terminal by wireless channel and processes.When terminal by vehicle-mounted link terminal, forward and vehicle-mounted link terminal only run up outbreak the used time, for simplifying research, forwarding strategy adopts simple amplification forwarding, vehicle-mounted receiving terminal may be received the message that vehicle-mounted link terminal and vehicle transmitting terminal send simultaneously, also may only receive the information that vehicle-mounted link terminal forwards, while receiving two message, message is carried out to geometric ratio simultaneously and merge processing, corresponding communication scenes is to improve the relay forwarding system of power system capacity, while only receiving vehicle-mounted link terminal message without carrying out extra process, corresponding communication scenes is the relay forwarding system that expands communication range.Terminal is communicated by letter by vehicle-mounted link terminal, vehicle-mounted link terminal both can be used as forward relay node, also, in the time of can being used as source destination node, while transmitting this nodal information and other nodal informations mainly for it, the time division multiple access processing of data message and receiving terminal are to data resolution process simultaneously.Specific implementation as Figure 7-9.Fig. 7 is vehicle transmitting terminal by link terminal and vehicle-mounted receiving terminal without diversity communication physical layer simulation model, and vehicle-mounted link terminal only has relay forwarding function; Fig. 8 is that vehicle transmitting terminal has diversity communication physical layer simulation model by link terminal and vehicle-mounted receiving terminal, and vehicle-mounted link terminal only has relay forwarding function; Fig. 9 be vehicle transmitting terminal by link terminal and vehicle-mounted receiving terminal communication physical layer simulation model, vehicle-mounted link terminal sends own information simultaneously.
Should be appreciated that the above detailed description of technical scheme of the present invention being carried out by preferred embodiment is illustrative and not restrictive.Those of ordinary skill in the art modifies reading the technical scheme that can record each embodiment on the basis of specification of the present invention, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (2)
1. the car networked system based on IEEE802.16 agreement, it is characterized in that, described system comprises car-mounted terminal, channel module, described car-mounted terminal comprises vehicle transmitting terminal, vehicle-mounted receiving terminal and vehicle-mounted link terminal, described vehicle transmitting terminal has multiple OFDM transmission subsystems of different frame structures, described channel module has awgn channel or frequency selective fading channels, described vehicle-mounted receiving terminal is corresponding to the OFDM receiving subsystem of vehicle transmitting terminal, the intermediate treatment process subsystem that described vehicle-mounted link terminal is vehicle transmitting terminal and vehicle-mounted receiving terminal,
Described vehicle transmitting terminal and vehicle-mounted receiving terminal are by direct communication mode, or vehicle-mounted link terminal communication, vehicle-mounted link terminal is only forward node mode, or vehicle-mounted link terminal of vehicle-mounted link terminal communication while sends own information mode to vehicle-mounted receiving terminal transmission data;
Vehicle-mounted receiving terminal receives after data, the data that judgement receives, if adopt direct communication between terminals, vehicle-mounted receiving terminal directly carries out OFDM demodulation, equilibrium, QPSK demodulation, channel-decoding;
If be only forward node by the communication vehicle carried link terminal of vehicle-mounted link terminal, if there is relaying diversity, reception data carried out to equal gain combining processing and then carry out OFDM demodulation, equilibrium, QPSK demodulation, channel-decoding; If without diversity, directly carry out OFDM demodulation, equilibrium, QPSK demodulation, channel-decoding;
If send own information by vehicle-mounted vehicle-mounted link terminal of link terminal communication while, receiving terminal, by control information information extraction, then carries out respectively subsequent treatment.
2. the car networked system based on IEEE802.16 agreement according to claim 1, it is characterized in that, described system onboard launch terminal is exported data by information source, and output data form armed burst through chnnel coding, QPSK modulation, OFDM modulation.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105391782A (en) * | 2015-11-16 | 2016-03-09 | 上海交通大学 | V2I/V2V Internet-of-things system based on cognitive OFDM and method thereof |
| CN109874126A (en) * | 2019-03-05 | 2019-06-11 | 南京钛佳汽车科技有限公司 | A kind of application method of wireless communication technique in car networking V2V |
| CN110086569A (en) * | 2019-04-03 | 2019-08-02 | 上海无线通信研究中心 | Car networking can be changed frame traffic method, terminal and system |
| CN112040426A (en) * | 2020-11-05 | 2020-12-04 | 成都中航信虹科技股份有限公司 | Single carrier ad hoc network communication method and system |
-
2013
- 2013-12-31 CN CN201310751774.3A patent/CN103763345A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105391782A (en) * | 2015-11-16 | 2016-03-09 | 上海交通大学 | V2I/V2V Internet-of-things system based on cognitive OFDM and method thereof |
| CN105391782B (en) * | 2015-11-16 | 2019-09-10 | 上海交通大学 | A kind of V2I/V2V car networking system and its method based on cognition OFDM |
| CN109874126A (en) * | 2019-03-05 | 2019-06-11 | 南京钛佳汽车科技有限公司 | A kind of application method of wireless communication technique in car networking V2V |
| CN110086569A (en) * | 2019-04-03 | 2019-08-02 | 上海无线通信研究中心 | Car networking can be changed frame traffic method, terminal and system |
| CN110086569B (en) * | 2019-04-03 | 2022-04-15 | 上海无线通信研究中心 | Internet of vehicles variable frame communication method, terminal and system |
| CN112040426A (en) * | 2020-11-05 | 2020-12-04 | 成都中航信虹科技股份有限公司 | Single carrier ad hoc network communication method and system |
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Application publication date: 20140430 |