Optimal cooperation point selection method based on tdma protocol in highly dynamic vehicular ad hoc network
A self-organizing network, highly dynamic technology, applied in the directions of location-based services, specific environment-based services, network topology, etc., can solve problems such as unavoidable packet loss and throughput decline, and avoid data propagation delays. , the effect of reducing the number of forwarding and improving the overall performance
Inactive Publication Date: 2018-07-03
CENT SOUTH UNIV
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However, due to the random selectivity of its cooperative nodes, it is still difficult to avoid the loss of data packets and the decline of throughput in the case of poor channel conditions.
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[0035] see figure 1 , the flow process of the present invention is as follows:
[0036] The current node initialization includes: node collection nodeInitialized to the information of the current node, where the number id , longitude coordinates x , latitude coordinates y The information is initialized to the real-time information of the current node; the flag bit of the cooperative node H , reserved control time slot i , the reserved business time slot number j and reserved cooperative forwarding slots h Initialize to empty.
[0037] After each parameter is initialized, the current node continues to monitor the channel until the end of a complete frame and selects an empty control slot as its reserved control slot i , choose an empty business time slot as its reserved business time slot j ;
[0038] The current node judges the current time slot type, if it is a control time slot, it judges whether it is a reserved control time slot i . If not control slot i The...
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The invention discloses an optimal cooperation node selecting method based on a TDMA (Time Division Multiple Address) protocol in a high-dynamic vehicular ad hoc network. The method comprises the steps of dividing a channel into time frames including a control frame and a transmission frame, separately dividing the control frame and the transmission frame into a plurality of sub time slots, and judging whether a cooperation node is needed or not according to the transmission success rate Psuccess between a current node and a destination node, wherein the judgment is based on the transmission success rate Psuccess between a source node S and a destination node D, and if the Psuccess is lower than 60% of the threshold, a cooperation node is needed; and if a cooperation node is needed, selecting a neighbor node with the maximum CV value between the current node and the destination node as the cooperation node. According to the method, when a vehicle forwards data, an optimal cooperation node is selected according to the position of the vehicle and the state of the channel, so that the success rate of data transmission can be improved, the forwarding frequency can be reduced, the communication delay can be lowered, and then the network transmission efficiency is improved.
Description
technical field [0001] The invention relates to an optimal cooperation point selection method based on TDMA protocol in a highly dynamic vehicle ad hoc network. Background technique [0002] In VANET, due to factors such as fast node movement, short link life, fast network topology dynamic changes, and unstable group member nodes, how to design a Medium Access Control (MAC) protocol to ensure data security? Fast and efficient transmission becomes a prominent issue. So far, the academic community has mainly proposed the following types of media access control protocols for VANETs. [0003] The first type of protocol is a MAC protocol based on CSMA (Carrier Sense Multiple Access / Collision Detection). Compared with other typical wireless networks, in addition to the characteristics of unreliable wireless network transmission and shadow fading, vehicular networks also face many challenges. The characteristics of high-speed movement of vehicles, dynamic topology changes, and s...
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IPC IPC(8): H04L29/08H04W4/02H04W4/40H04W40/22H04W40/38H04W84/18
CPCH04L67/12H04W40/22H04W40/38H04W84/18
Inventor 黄家玮都鑫
Owner CENT SOUTH UNIV