5G系统机器类通信场景下基于动态接入优先级的拥塞控制策略研究

Congestion Control Strategy based on Dynamic Access Priority in 5G System Machine-Type Communication Scenario

随着万物互联的IT3.0时代的到来,机器类通信(Machine-Type Communication,MTC)将成为未来人机物三元互联的5G通信系统中最主要的通信方式之一。然而,MTC设备种类繁多、数目巨大,大量设备同时发起接入时必然会造成网络拥塞、时延长等问题。于是,提出了一种基于动态接入优先级的拥塞控制策略。该方法首先根据MTC设备的时延容忍度进行优先级划分,并依据控制时延动态更新设备优先级,针对不同优先级采用不同的接入概率因子限制接入设备数目。仿真结果表明,提出的方法可以在保证不同优先级设备的接入时延前提下,有效控制海量机器类设备接入时的网络拥塞。

With the advent of IoE(Internet of Everything)IT3.0 age, MTC(Machine-Type Communication)would become one of the most important communication methods in the future 5G communication system with human, machine and object interconnection. However, there are many types and large numbers of MTC devices, and when a large number of devices initiate access at the same time,network congestion and long-time delay would inevitably occur. Therefore, a congestion control strategy based on dynamic access priority is proposed. Firstly, the priority is divided in accordance with the delay tolerance of MTC device. Then, the device priority is dynamically updated according to the control delay.Different access-probability factors are used to limit the number of access devices for different priorities.The simulation results indicate that the proposed method can effectively control the network congestion when massive machine-type equipments are accessed while ensuring the access delay of different-priority devices.