Time division multiple access-based resource scheduling scheme for Internet of vehicles

Abstract

The invention discloses a time division multiple access technology-based resource scheduling method for the Internet of vehicles. The method mainly comprises the following steps of implementing the resource scheduling of vehicle-to-infrastructure and vehicle-to-vehicle communication links under the control and strategies of a roadside center unit; calculating a scheduling weight factor of each communication link according to information such as channel states, positions and movement speed cyclically fed back by vehicles, and preferentially scheduling timeslot resources to communication links (groups) with higher scheduling weight factors for data transmission by using the roadside center unit, wherein a plurality of vehicle-to-vehicle communication links can be combined into a communication link group if a distance between every two center vehicles serving as data transmitting terminals is longer than a preset interference interval, and a scheduling weight factor of each communication link group is the summation of the scheduling weight factors of all the communication links in the group; the same timeslot resource can be shared by each communication link in the same communication link group for data transmission; the sharing of the timeslot resources between different vehicle-to-infrastructure communication links and between the vehicle-to-infrastructure communication links and the vehicle-to-vehicle communication links for data transmission is not allowed. According to the resource scheduling method, the network throughput and the spectral efficiency of the Internet of vehicles can be effectively improved, and high network throughput performance can still be maintained particularly under the condition of high network load.

Description

technical field [0001] The present invention proposes a resource scheduling scheme for vehicle-to-road communication and vehicle-to-vehicle communication based on time division multiple access, which is applicable to the field of wireless vehicle communication. In the scheme, the time of the vehicle-to-road communication link and the vehicle-to-vehicle communication link Slot resource scheduling is uniformly scheduled by the roadside central unit according to the weight factors of each communication link, and at the same time allows multiple vehicle-to-vehicle communication links whose central vehicle distance is greater than a certain interference interval to share the same time slot resource to improve network spectrum efficiency. Background technique [0002] In recent years, with the proposal and development of intelligent transportation systems, the Internet of Vehicles has received more and more attention and research. There are mainly two communication methods in the I...

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Problems solved by technology

However, in the existing MAC schemes of the Internet of Vehicles, whether it is a random contention scheme based on CSMA / CA or an access scheme based on TDMA, most of them are distributed processing, and when considering the channel state in a TDMA-based access scheme, usually It only defines information such as channel usage status or link requirements, and rarely introduces specific channel quality information (Channel State Information, CSI) of each communication link for effective resource scheduling. At the same time, different communication links are not allowed to share resources for communication, and thus are limited in the realization of network spectral efficiency

With the increase in the number of vehicles and vehicle communication requirements in the Internet of Vehicles, the defects of the existing MAC solutions for the Internet of Vehicles that cannot effectively improve the network throughput and spectrum efficiency will become more and more obvious, which will affect the performance and performance of the entire network. Vehicle QoS

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