海量配用电业务自适应接入控制机制研究

Research on Adaptive Simultaneous Access Control Mechanism for Massive Electrical Distribution and Metering Services

摘要: 电力无线专网是海量电力配用电业务最后一公里通信接入的有效手段，然而海量的业务并发接入势必带来随机接入信道的拥塞。为解决采用TD-LTE技术的电力无线专网海量数据并发接入的冲突问题，本文提出一种自适应接入控制机制，系统基于业务优先级执行冲突退避策略，海量业务并发时，基站(eNB)统计随机接入信道拥塞情况并下发退避指令，低优先级业务节点的根据指令选择退避策略，从而降低网络总体冲突次数，提升高优先级业务的接入成功率。因此，基于业务优先级的自适应接入控制机制可有效改善海量业务并发接入性能。

Abstract: Electrical dedicated wireless network is regarded as an effective approach to enable last-mile communication access for electrical distribution automation and smart metering. But simultaneous access for massive terminals tends to result in congestion in random access channels. To solve the issue of concurrent access of a huge number of nodes, this paper proposes an adaptive access control mechanism. The system implements a collision backoff strategy based on the service pri-ority. When the massive services are concurrent, the eNB (Evolved NodeB) counts the congestion data of the random access channel and broadcasts the backoff command, and the low-priority ser-vice node selects the backoff policy according to the instruction, thereby reducing the total number of network collisions and improving the access success rate of the high-priority service. Therefore, the adaptive access control mechanism based on service priority can effectively improve the concurrent access performance of massive services.