An annulus-based access class barring scheme for stationary machine-type communications devices
An annulus-based access class barring scheme for stationary machine-type communications devices
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DOI：
10.1109/mownet.2016.7496629
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发表时间：
2016-04
期刊：
影响因子：
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通讯作者：
Xiangdong Gao;Hui Tian;Xinchen Lyu
中科院分区：
文献类型：
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作者：
Xiangdong Gao;Hui Tian;Xinchen Lyu
第三代合作伙伴计划 (3GPP) 长期演进 (LTE) 蜂窝网络是一种很有前途的机器类型通信 (MTC) 系统。然而，随着LTE网络中大量MTC设备（MTCD）的出现，随机接入过载成为一个严重的问题。为了解决这个问题，接入类别禁止（ACB）和定时提前（TA）命令比较是通过限制随机接入请求数量的两种有效方案。在本文中，我们提出了一种基于环带的 ACB (AB-ACB) 方案，并将其与静止 MTCD 场景中的 TA 命令比较相结合。 AB-ACB旨在挖掘静止场景下的设备分布潜力，将小区覆盖范围划分为一些等宽的圆环，并根据这些圆环中MTCD的分布情况调整ACB参数。在组合方案中，根据LTE小区部署自适应地配置最佳环面数量和ACB参数，以最大化随机接入时隙（RAS）中服务的MTCD的预期数量。仿真结果表明，与联合使用普通ACB和TA命令的方案相比，我们提出的组合方案在随机接入效率方面表现更好。
The 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) cellular network is a promising system for machine-type communications (MTC). However, random access overload becomes a severe issue with the emerging massive number of MTC devices (MTCDs) in LTE network. To solve the problem, access class barring (ACB) and timing advance (TA) command comparison are two effective schemes by limiting the number of random access requests. In this paper, we propose an annulus-based ACB (AB-ACB) scheme and combine it with TA command comparison in stationary MTCDs scenario. Aiming to exploit the devices distribution potential in stationary scenario, AB-ACB divides cell coverage into some annuluses with equal width and adjusts ACB parameters based on the distribution of MTCDs in these annuluses. In the combined scheme, the optimal number of annuluses and ACB parameters are adaptively configured according to LTE cell deployment, so as to maximize the expected number of MTCDs served in a random access slot (RAS). Simulation results show that, comparing to the scheme jointly using ordinary ACB and TA command comparison, our proposed combined scheme outperforms in random access efficiency.