Dynamic V2V link delay predicting method in VANETs

A technology of dynamic prediction and link delay, which is applied in the traffic control system of road vehicles, traffic flow detection, instruments, etc., can solve the problem of inability to accurately predict link delay, link delay or link connectivity inappropriate, It is difficult for the driver to discover the general law of vehicle node speed changes and other issues

Active Publication Date: 2014-09-24
HARBIN INST OF TECH
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Problems solved by technology

[0007] The purpose of the present invention is to solve one, under the urban environment, by the road topological structure of intersection, the change of traffic light, the factor such as the turning of intersection influences link delay analysis, can't accurately predict link delay actually; Two, MANETs The analysis method does not meet the needs of the vehicle network environment and applications; the resear

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  • Dynamic V2V link delay predicting method in VANETs
  • Dynamic V2V link delay predicting method in VANETs
  • Dynamic V2V link delay predicting method in VANETs

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Example Embodiment

[0051] Specific implementation mode 1: A dynamic prediction method of V2V link delay in VANETs in this embodiment is specifically prepared according to the following steps:

[0052] Step 1. Suppose the speed of the i-th vehicle is The speed of vehicle j is Relative speed for According to relative speed Calculate the relative speed value of any two vehicles △v;

[0053] Step 2: Calculate the relative displacement value △S of the front of the i-th vehicle and the j-th vehicle;

[0054] Step 3: According to the relative velocity value △v calculated in step 1, △v is calculated to obey the general normal distribution, namely Gaussian distribution The mean value of the speed difference u, variance σ 2 , Where V i Is the random variable of the speed of car i that obeys the normal distribution, V j Is a random variable that obeys the normal distribution of the speed of car j, v i Is the speed value of the ith vehicle, v j Is the speed value of the j-th vehicle;

[0055] Step 4. According...

Example Embodiment

[0063] Specific embodiment two: This embodiment is different from specific embodiment one in that it is assumed in step one that the speed of the i-th vehicle is The speed of vehicle j is Relative speed for According to relative speed Calculate the relative speed value △v of any two cars as:

[0064] The present invention stipulates that vehicles traveling from left to right and from bottom to top (on the street map, from west to east and from south to north) are driving forward; the model given by the present invention only considers those traveling in the same and opposite directions Vehicles; for convenience, all speeds in the invention are treated as scalars;

[0065] △v is the relative speed value of the two vehicles of number i and number j, then

[0066] Δv = | | v → i | - | v → j | | diri = dirj | v → i | + | v → j | diri ≠ dirj - - - ( 2 )

[0067] In the for...

Example Embodiment

[0068] Specific embodiment three: this embodiment is different from specific embodiment one or two in that in step two, the relative displacement value ΔS of the front of the i-th vehicle and the j-th vehicle is calculated as:

[0069] ΔS = | | S → i | - | S → j | | diri = dirj | S → i | + | S → j | diri ≠ dirj

[0070] The displacement of vehicle i is The displacement of vehicle j is Other steps and parameters are the same as those in the first or second embodiment.

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Abstract

The invention relates to a dynamic V2V link delay predicting method in VANETs to solve the problems that the link delay cannot accurately and practically predicted, the vehicle-mounted network environment and the application requirement cannot be met through the method based on the MANETs, it is very hard for a driver to find out the universal law of automobile node velocity change, and then great difficulty is brought to link delay prediction. The method comprises the steps that firstly, the relative velocity value delta v of two automobiles is calculated; secondly, the relative displacement value delta S of two automobile heads is calculated; thirdly, the average speed difference value u and the variance sigma 2 of the formula seen in the specification are worked out; fourthly, the relative distance L is calculated; fifthly, the mathematical expectation value ET of link delay is calculated. The method is applied to the field of dynamic V2V link delay prediction in VANETs.

Description

technical field [0001] The invention relates to a dynamic prediction method of V2V link delay in VANETs. Background technique [0002] Link delay is one of the key important parameters for V2V information transmission application and its security application in VANETs. However, theoretical analysis and prediction of link delay is very complicated. Previous research work has considered the speed, density, position, direction, distance between nodes of vehicles in traffic flow, the transmission range of wireless signals, traffic lights, etc. The influence of the change of , the car turning at the intersection, etc. on the link delay, but assuming that the vehicle speed, traffic density is constant, and the traffic lights are independent, it cannot accurately predict the link delay. [0003] In fact, the speed of cars on the road is changing randomly. The complex environment of VANETs and the vulnerability of wireless channels have brought great challenges to the theoretical a...

Claims

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Application Information

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IPC IPC(8): G08G1/01G08G1/052
Inventor 崔刚王秀峰王春萌付忠传吴翔虎暴建民莫毓昌朱东杰张策张必英
Owner HARBIN INST OF TECH
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