交通应急通信中信道自适应的业务接入机制

doi:10.11959/j.issn.1000-0801.2022009

Abstract

Abstract:

In high-density cellular vehicle-to-everything (C-V2X), effective massive access method of cluster communications is the basis to assure the performance index for different services and enhance the spectrum efficiency under limited resource.An improved access class barring (ACB) scheme was proposed using channel status information based on computing power of communication terminal in C-V2X.The base station estimated the communication density within its cover range, generated the ACB factor using the communication density, and broadcasted the ACB.According to signal to interference plus noise ratio (SINR) and ACB factor of the received broadcast signal, the vehicular communication terminal computed the access probability, and compared with ACB factor.When the access probability was more than the ACB factor, the terminal selected a preamble randomly from the preamble pool with the probability which equal to the access probability or one.The terminal transmited the selected preamble to the base station for finishing the access program.The simulation results show that the scheme proposed has 5%～20% advantage over S-Aloha and machine to machine opportunistic splitting algorithm (M2M-OSA) schemes in average access collision probability.It reduces the average access delay effectively.

Key words: internet of vehicles, cluster communication, channel status awareness, massive access

CLC Number:

TN929.5

Jiao WANG, Gongan QIU, Shibing ZHANG. Adaptive channel status based access class barring scheme for traffic emergency communication[J]. Telecommunications Science, 2022, 38(1): 95-101.

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参数名称	参数取值
分组到达率λ/(s^-1)	1/60
前导码池数量M	54
PRACH配置参数	6
接入周期TA/ms	10
退避指数W/ms	20

Adaptive channel status based access class barring scheme for traffic emergency communication

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