Performance Analysis of a Novel Hybrid S-ALOHA/TDMA Protocol for Beta Distributed Massive MTC Access.
Performance Analysis of a Novel Hybrid S-ALOHA/TDMA Protocol for Beta Distributed Massive MTC Access.
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用于 Beta 分布式大规模 MTC 接入的新型混合 S-ALOHA/TDMA 协议的性能分析
DOI：
10.3390/s17122875
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发表时间：
2017-12-15
期刊：
影响因子：
--
通讯作者：
Xie W
中科院分区：
文献类型：
--
作者：
Sui N;Xu Y;Wang C;Xie W
预计大规模机器类型通信（MTC）设备的同时随机接入会导致无线电接入网络中的拥塞。如果没有合适的媒体接入控制（MAC）协议，不仅MTC的性能，而且共存的人对人（H2 H）通信也会显著地降低。然而，大多数现有的解决方案集中在随机接入过程，而不处理sunmix数据传输过程。本文首先在分析时隙ALOHA（S-ALOHA）和时分多址（TDMA）协议容量的基础上，推导出了一个分组大小阈值。提出了一种新的面向大规模MTC接入的混合S-ALOHA/TDMA MAC协议（HSTMAC），该协议将小分组的beta分布式机器到机器（M2M）业务和大分组的高优先级H2 H业务的资源分开。将接入等级限制（ACB）机制作为一种过载控制方法，严格分析了任意重传限制下的系统均衡，为保证服务质量（QoS）提供了依据。最后，动态预退避（DPBO）算法的负载平衡设计的自适应分散的高度同步的M2M业务的传输间隔。数值和仿真结果验证了我们的分析，并表明HSTMAC协议是上级优于纯S-ALOHA协议和纯TDMA协议。与均匀预回退（UPBO）算法相比，DPBO算法具有更高的成功概率和资源利用率，且平均时延大大降低。
Simultaneous random access of massive machine type communications (MTC) devices are expected to cause congestion in the radio access network. Not only the performance of MTC, but the coexisting human to human (H2H) communications would also degrade dramatically without an appropriate medium access control (MAC) protocol. However, most existing solutions focus on the random access procedure without dealing with the sunsequent data transmission procedure. In this paper, we firstly derive a packet size threshold based on the capacity analysis of slotted ALOHA (S-ALOHA) and time division multiple access (TDMA) protocols. Then a novel hybrid S-ALOHA/TDMA MAC protocol (HSTMAC) is presented for massive MTC access, in which the resources are separated for beta distributed machine to machine (M2M) traffic with small size packets and high priority H2H traffic with large size packets. Considering access class barring (ACB) scheme as an overload control method, the system equilibrium under arbitrary retransmission limit is analyzed rigorously, which can provide insights on quality of service (QoS) guarantee. Finally, a dynamic pre-backoff (DPBO) algorithm is designed for load balance by adaptively scattering the highly synchronized M2M traffic over the transmission interval. Numerical and simulation results validate our analysis and show that the HSTMAC protocol is superior to pure S-ALOHA protocol and pure TDMA protocol. The proposed DPBO algorithm can achieve a higher success probability and resource utilization ratio with a much reduced average delay than that of uniform pre-backoff (UPBO) scheme.
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