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基于时延补偿的小小区多跳空口同步
雷珍珠,徐浪,申滨,黄晓舸
0
(重庆邮电大学 移动通信重庆市重点实验室,重庆 400065)
摘要:
在密集蜂窝异构网络中,小小区之间的时频同步是发挥小小区技术优势的重要条件以及网络系统正常运转的前提。传统的小区同步技术包括同步卫星辅助同步及IEEE 1588协议同步。为克服传统小区同步技术的不足,空口同步技术成为研究热点。在此基础上,提出了一种基于时延补偿的多跳空口同步机制,通过源小区空口同步信号(RISS)所在时帧位置来确定其同步等级,同时对源小区RISS的传播时延进行补偿,从而提高目标小小区同步精度。仿真表明,该方案在同步跳数为4时,定时同步误差仍可维持在1 μs以内,从而有效地提高了网络同步精度,并突破了同步跳数对空口同步技术的限制,扩大了空口同步范围。
关键词:  异构网络  小小区  空口同步  多跳同步  时延补偿
DOI:
基金项目:国家科技重大专项(2016ZX03001010-004)
Multi-hop radio interface synchronization in a small cell network based on time delay compensation
LEI Zhenzhu,XU Lang,SHEN Bin,HUANG Xiaoge
()
Abstract:
In a cellular heterogeneous network(HetNet) where a large number of small cells are densely deployed,time-frequency synchronization among the small cells plays an important role in bringing the advantages of small cells technology,and it is also a prerequisite for realistic network operation.Traditional cell synchronization technologies include the satellite aided synchronization and the IEEE 1588 protocol synchronization.In order to overcome the shortcomings of traditional methods,radio-interface based synchronization(RIBS) for small cells becomes a hot research topic.Based on radio interface,a multi-hop RIBS mechanism with time delay compensation is proposed,where the synchronization level of the source cell synchronization signal is determined by its corresponding time shift in the radio frame,and the propagation delay of the source cell radio-interface synchronization signal(RISS) is compensated to improve the synchronization precision of the target small cell.Simulation shows that the timing synchronization error of the proposed scheme can maintain a level of 1 μs or less when the number of synchronization hops is four.Therefore,it effectively improves the network synchronization accuracy,surpasses the limit of the RIBS synchronization hops,and meanwhile expands the RIBS area within the network.
Key words:  heterogeneous network(HetNet)  small cell  radio interface synchronization  multi-hop synchronization  time delay compensation
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