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

摘要/Abstract

摘要：

摘要：在高密度蜂窝车联网（cellular vehicle-to-everything，C-V2X）中，群集通信终端的有效阵列接入方法是多业务性能保障和有限频谱效率提升的前提。利用蜂窝车联网中终端计算能力，提出了信道自适应的业务接入机制。该机制由基站估计当前区域通信密度，生成通信密度关联的接入类别限制（access class barring， ACB）因子，并在通信区域内广播；随后，车载通信终端根据接收基站广播信号的信干噪比（signal to interference plus noise ratio，SINR）和ACB因子计算自适应信道状态的接入概率，并比较接入概率和ACB因子。当接入概率大于ACB因子时，通信终端以最小接入概率从前导码池中随机选择一个前导码上传到基站，以获得与信道状态匹配的接入机会。仿真结果表明，在高密度通信状态下，与S-ALOHA协议和M2M-OSA方案相比，所提方案平均接入碰撞概率降低了约5%～20%，有效地减小了平均接入时延。

关键词: 车联网, 群集通信, 信道状态感知, 阵列接入

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

中图分类号:

TN929.5

王娇, 邱恭安, 张士兵. 交通应急通信中信道自适应的业务接入机制[J]. 电信科学, 2022, 38(1): 95-101.

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