An adaptive transmission mode selection system and method for vehicle communication access network

Abstract

The invention discloses a self-adaption transmission mode selecting system and method for a vehicle communication access network. The system comprises a vehicle information service flow generating module, a vehicle information service flow classifying and mapping module, a grouping and submitting module, a self-adaption transmission mode selecting module, an OFDMA wireless resource allocating module, a frame sending / receiving module and an access channel / driving state / local geographic area information detecting module which are arranged at the I / B position. The system further comprises a vehicle information service flow generating module, a vehicle information service flow classifying and mapping module, a grouping and submitting module, a self-adaption transmission mode selecting module, an OFDMA wireless resource allocating module, a frame sending / receiving module and an access channel / driving state / local geographic area information feedback module which are arranged at the SV position. The self-adaption transmission mode selecting system introduces an OFDMA technique and an AMC technique, can balance ITS information service flow transmission effectiveness and system transmission efficiency, can meet the QoS requirements of various ITS information service flows and meanwhile can acquire high system average effective data transmission rate.

Description

technical field [0001] The invention belongs to the technical field of vehicle communication, and relates to a vehicle communication method, in particular to a vehicle communication access network adaptive transmission mode selection system and its method. Background technique [0002] As one of the important subsystems of the Intelligent Transportation System (ITS), the vehicle communication access network is to ensure the smooth communication channel between the information service platform and the ITS vehicle terminal, and to realize the safety warning and efficient guidance of the ITS for the supervised vehicles, and provide services for passengers. The key to providing professional multimedia and mobile Internet application services. The target packet error rate reflects the reliability requirements of the ITS transmission information service flow, and is a key parameter to measure the quality of service (Quality of Service, QoS) of the vehicle communication access netw...

AI Technical Summary

Problems solved by technology

[0005] The current vehicle communication access network mostly uses GPRS or WiFi to provide many ITS user vehicles (Subscriber Vehicle, SV) with the "last mile" wireless access service to the infrastructure / base station (Infrastructure / BaseStation, I / B). The communication method does not consider the transmission reliability requirements of different application-level information service streams, and usually uses a fixed modulation and coding mode for data transmission, so the access rate is not high, and it cannot meet the growing diversification of information services that prioritize safety for passengers demand

In addition, the ITS vehicle-mounted terminal usually integrates a high-precision Global Positioning System / Geographic Information System (GPS / GIS) module, which can obtain a wealth of external information, such as driving speed, driving direction, own position information, where Regional geographic information, etc. However, the current vehicle communication access network does not consider using this information to help improve the QoS performance of various information service flows

Therefore, the diversity of ITS information service flow application types and the specificity of the vehicle communication access network industry have brought challenges and opportunities to the design of the next generation vehicle communication access network

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