Method for effectively broadcasting period information based on traffic flow density and cross-layer information
A traffic flow density and cross-layer technology, applied in the field of Internet of Vehicles communication, can solve the problems of high collision rate of broadcast cycle information, low utilization rate of network resources, low transmission success rate, etc., achieve low collision rate, effectively stabilize traffic density, The effect of high transfer rate
Active Publication Date: 2017-04-26
SOUTH CHINA UNIV OF TECH
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[0006] The present invention proposes a method for effectively broadcasting periodic information based on traffic density and cross-layer information, aiming to solve the problems of high collision rate of broadcast periodic information, large transmission delay, low transmission success rate, and low utilization rate of network resources
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[0026] The above description is only an overview of the technical solution of the present invention. In order to make the purpose, technical solution and advantages of the present invention clearer, the above-mentioned solution will be further described below in conjunction with a preferred specific embodiment; it should be understood that these embodiments are for illustration The invention is not intended to limit the scope of the invention.
[0027] In this example, if figure 1 As shown, RSU divides the road into non-overlapping closed areas. There are two closed areas in the figure, and the area S divided by RSU1, RSU2, RSU3, and RSU4 1 And the area S divided by RSU4 and RSU5 2 , when the vehicle node starts from S 1 Exit, enter S 2 , counted by RSU4, Cs 1 Minus 1, Cs 2 Increase by 1.
[0028] Such as figure 2 As shown, this embodiment includes the following steps:
[0029] (1) Detect the traffic density ρ (vehicle / m) with the cooperation of the roadside unit. Th...
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The invention discloses a method for effectively broadcasting period information based on traffic flow density and cross-layer information. The method comprises the following steps: detecting traffic flow density rho (pcu / m); under n period broadcast time intervals, summarizing related information sending states of a MAC layer and a PHY layer; and according to the traffic flow density and the related information sending states of the MAC layer and the PHY layer, dynamically adjusting sending power of a vehicle itself to control effective sending distance of a vehicle node, thereby realizing effective sending of period broadcast information. The information sending power is adjusted dynamically according to the traffic flow density and the cross-layer information, and furthermore, the sending distance of the period broadcast information is adjusted, so that under the condition of high traffic flow density, the information sending power is reduced, and under the condition of low traffic flow density, the information sending power is improved; effects of low delay, low collision rate and high transmission rate are still remained when broadcasting period information under different traffic flow densities; and meanwhile, utilization rate of network resources of an internet of vehicles is improved favorably, and unicast and multicastRouting delivery rate of the internet of vehicles is improved.
Description
technical field [0001] The invention relates to the technical field of Internet of Vehicles communication, in particular to a method for effectively broadcasting periodic information based on vehicle flow density and cross-layer information. Background technique [0002] Vehicular Ad Hoc Network (VANET) is an important part of ITS, usually composed of on-board unit (OBU) and roadside unit (RSU). VANET supports vehicle-to-vehicle communication ( Vehicle to Vehicle (V2V) and communication between vehicles and roadside fixed infrastructure (Vehicle to Infrastructure, V2I) make intelligent driving, road condition forecast, safety warning, resource sharing and other services a reality. [0003] Opportunistic Network (Opportunistic Network) is an ad hoc network that does not require a complete path between the source node and the destination node, and uses the opportunity of mobile nodes to communicate. The characteristics of the intermittent connectivity state are consistent. Th...
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Login to View More IPC IPC(8): H04W72/00H04W72/04H04W72/12H04W84/18
CPCH04W72/0473H04W84/18H04W72/12H04W72/30Y02D30/70
Inventor 胡斌杰杜佳媛温清机
Owner SOUTH CHINA UNIV OF TECH