Self-adapting urgent message announcement method based on vehicle network
An emergency information and vehicle network technology, applied in the field of wireless communication, can solve problems such as poor pertinence, difficulty in message maintenance, and low data distribution efficiency, and achieve the effects of large two-way traffic flow on roads, overcoming network structure instability, and reducing resource consumption
Inactive Publication Date: 2013-05-15
BEIHANG UNIV
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[0011] The purpose of the present invention is to solve the problems of low data distribution efficiency, poor pertinence, and difficulty in message maintenance in VANETs due to its unstable frame structure, and proposes an adaptive emergency information notification method based on vehicle networks
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[0036] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.
[0037] like figure 1 As shown, the present invention proposes an adaptive emergency information notification method based on a vehicle network, which specifically includes the following steps:
[0038] Step 1: When the vehicle is driving, the notification message and the feedback message are received in real time. All vehicles within the broadcast radius of the message source can receive the message from the message source. If the vehicle that receives the message has not received the notification message before, it is the first time it receives the message from the current information source. Then save a copy of the message, and at the same time add the speed information and location information of the vehicle to the received message to generate a notification message, and go to step 2; if the vehicle is driving in the effective area of the notifi...
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The invention provides a self-adapting urgent message announcement method based on a vehicle network. The method is realized in a way that: a vehicle carrying an announcement message broadcasts the announcement message to the surrounding, obtains the running velocity vector of a neighbor vehicle node, whether the vehicle is announced, and other information according to the feedback message, calculates the running state relation between the vehicle and the neighbor vehicle according to the running state, and decides whether to continue broadcasting the announcement message, whether to delete the self announcement message copy, and the like according to the calculation result. In the invention, the vehicle carrying an announcement message can transmit the message in a self-adapting way on the premise of ensuring the optimal number of copies in the entire network, and the message can be kept at the boundary of the message effective zone, so that the vehicle running into the zone boundarycan receive the announcement message within the shortest time. Thus, on the premise of ensuring a certain distribution success rate, the invention reduces the network load and enhances the practicality of data distribution in the vehicle ad-hoc network.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, relates to a method for distributing wireless communication data, in particular to an adaptive emergency information notification method based on a vehicle Ad-hoc network. Background technique [0002] Opportunistic Networks (Opportunistic Networks) refers to a wireless ad hoc network that does not have a complete path between a communication source and a target, and realizes communication through connection opportunities brought about by device movement. In this type of ad hoc network, due to Mobile devices are sparsely distributed or moving quickly, coupled with factors such as wireless channel fading and interference, it is impossible to form a connected network (Reference [1]: Opportunistic Network, author Xiong Yongping, Journal of Software, Vo1.20, No.1, January2009 , pp.124-137). [0003] Vehicle ad-hoc networks (Vehicle ad-hoc Networks, VANETs for short) are spontaneous, s...
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IPC IPC(8): H04W4/22H04W48/12H04W4/90
Inventor 牛建伟刘畅童超胡凯
Owner BEIHANG UNIV