面向差异化MTC场景需求的随机接入方案

Random access scheme for different MTC scenario requirement

针对机器类通信(MTC)中大规模机器类通信(mMTC)和超可靠低时延通信(URLLC)的混合场景下差异化的随机接入需求,提出了一种面向差异化MTC场景需求的随机接入方案。该方案根据设备定时提前(TA)信息进行分组:对于URLLC设备,基站为组内核心设备预留前导码资源并通过非竞争方式接入网络,进而满足URLLC场景的高可靠低时延接入需求;对于mMTC设备,基站利用不同设备组TA信息的差异来区分选择相同前导码设备,并利用迭代干扰消除(SIC)检测设备数据信息,进而满足mMTC场景的海量接入需求。仿真结果表明,本方案能够显著提升成功接入设备数。

For the different random access requirements of the mixed scenarios of ultra-reliable low latency(URLLC)and massive machine type communications(mMTC)in MTC,a random access scheme based on devices grouping was proposed.The proposed scheme divided the MTC devices into several groups based on the timing advance(TA)information:for the URLLC scenario,preamble resources were reserved for core devices in each group,and the URLLC devices accessed the network via the contention-free mechanism,to satisfy the ultra-reliable low latency access requirement;for the mMTC scenario,the base station utilized the different TA information in different group to identify devices selecting the same preamble,and performed successive interference cancellation(SIC)algorithm to detect the data information,to satisfy the massive access requirement.Simulation results demonstrate that the proposed scheme can significantly increase the number of the successful devices.