Adaptive service data distribution method in IOV (Internet of Vehicles) environment based on opportunistic communication

Abstract

The invention discloses an adaptive service data distribution method in the IOV (Internet of Vehicles) environment based on opportunistic communication. The method comprises the steps: enabling adjacent vehicles or RSU to receive a Beacon message, judging the validity of the message, calculating an expected forwarding time delay if a forwarding condition is met, adding the expected forwarding time delay to a field, returning to RREP, enabling a vehicle or RSU at a former jump to execute the RREP response processing process after receiving the RREPs of the adjacent objects, returning an RREQ to an optimal next jump selected from a candidate object set, enabling a candidate object to judge whether all data packages arrive at a target position or not after the candidate receives the RREQ, enabling a forwarding vehicle or RSU to restart the new broadcast if not all data packages arrive at the target position till all data packages arrive at the target vehicle. The method achieves the effective distribution of service data in the IOV environment, improves the packet loss probability under the condition that other indexes and performances are guaranteed to be lossless, reduces the number of retransmission times, and reduces the time delay and the network expenditure.

Description

technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to a method for distributing adaptive service data based on opportunistic communication in an Internet of Vehicles environment. Background technique [0002] As a self-organizing network composed of vehicles and traffic roadside facilities (RSU), VANETs have many unique characteristics different from traditional MANETs: 1) The network topology is limited, but highly dynamic, and network connections are difficult to maintain. 2) Vehicle movement is regular and predictable. 3) Message dissemination is directional and restricted by geographic location. 4) VANETs follow the road topology and are closely integrated with traffic applications. Therefore, different application scenarios will have a huge impact on the design and formulation of data distribution protocols, making it difficult for traditional self-organizing network data distribution protocols to meet the qu...

AI Technical Summary

Problems solved by technology

3) Message dissemination is directional and restricted by geographic location

The disadvantage of this method is that when all adjacent objects do not satisfy the forwarding policy, the request is discarded, which will cause multiple broadcasts, and then form a broadcast storm

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