A novel random access scheme for stationary machine-type communication devices

A novel random access scheme for stationary machine-type communication devices
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一种用于固定机器类型通信设备的新型随机接入方案

DOI:
10.1049/iet-com.2018.5445
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发表时间:
2018-08
期刊:
影响因子:
1.6
通讯作者:
Guo Xudong
Guo Xudong
中科院分区:
计算机科学4区
文献类型:
--
作者:
Zhang Mingyu;Li Ying;Guo Xudong

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长期演进(LTE)蜂窝网络是专门为人与人通信而设计的,在机器与机器通信场景中吸引了越来越多的关注。然而,当大量机器类型通信(MTC)设备同时需要接入网络时,LTE网络中现有的随机接入机制将不可避免地遭受严重拥塞。为了解决固定MTC设备的这个问题,作者提出了一种新的随机接入方案。在所提出的方案中,基于调度冲突的定时提前选择(ACT A S)算法的设计,其中,通过一个特殊的前导放置方法的帮助下,eNodeB(eNB)可以估计具有不同的定时提前(TA)索引的竞争者的数量。根据估计结果,eNB可以选择要包含在随机接入响应信息中的TA索引。此外,他们还分析了在每个随机接入时隙中可以成功接入网络的MTC设备的数量。仿真结果证明了吞吐量分析的准确性以及所提出的随机接入方案在所需时隙的数量方面的显着性能,以服务于所有设备。
The long term evolution (LTE) cellular network, primitively designed for human-to-human communications, is attracting more and more attention in machine-to-machine communication scenarios. However, when a massive number of machine-type communication (MTC) devices require access to the network simultaneously, the existing random access mechanism in LTE networks will inevitably suffer from severe congestion. In order to address this problem for stationary MTC devices, the authors propose a novel random access scheme. In the proposed scheme, an alleviating-collision based timing-advance selection (ACT A S) algorithm is designed where, aided by a special preamble placement method, the eNodeB (eNB) can estimate the number of contenders with different timing advance (T A ) indices. According to the estimated results, the eNB can choose the T A index to be contained in the random access response information. In addition, they further analyse the number of MTC devices which could successfully access the network in each random access slot. The simulation results prove the accuracy of the throughput analysis as well as the remarkable performance of the proposed random access scheme in terms of the number of required slots to serve all the devices.
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