计算机应用 ›› 2011, Vol. 31 ›› Issue (12): 3174-3176.

• 网络与通信 • 上一篇    下一篇

TD-SCDMA集群系统中基于分组的随机接入策略

蒋青,许泽文,唐宏,刘彰茂,吴香林   

  1. (重庆邮电大学 移动通信技术重庆市重点实验室,重庆 400065)
  • 收稿日期:2011-06-09 修回日期:2011-08-03 发布日期:2011-12-12 出版日期:2011-12-01
  • 通讯作者: 许泽文
  • 基金资助:

    国家高科技研究发展计划(863计划);教育部春晖计划;重庆市科技攻关计划项目

Random access packet-based strategy for TD-SCDMA trunking system

JIANG Qing,XU Ze-wen,TANG Hong,LIU Zhang-mao,WU Xiang-lin   

  1. Chongqing Key Laboratory of Mobile Communications,Chongqing University of Posts and Telecommunications, Chongqing 400065, China
  • Received:2011-06-09 Revised:2011-08-03 Online:2011-12-12 Published:2011-12-01
  • Contact: XU Ze-wen

摘要: 在用户接入强度大时,容易产生碰撞导致随机接入失败。针对这个问题,提出一种基于分组的随机接入策略。该策略将用户分为若干组,若干子帧组成一个超帧,用户进行随机接入时,在超帧对应子帧上发送上行同步码,在此基础上,为不同组别用户设定不同优先级。与一般不分组的情况进行对比,基于分组的随机接入策略提高了用户接入成功率,基于优先级的分组进一步保证了高优先级用户更高的接入成功率。理论分析和仿真结果表明,所提出的分组策略能够明显改善系统的服务质量,是一种有效降低随机接入碰撞概率的方法。

关键词: TD-SCDMA, 集群, 随机接入, QoS, 优先级

Abstract: Concerning the collision and access failure which are very likely to occur when the intensity of the users’ access increases, a random access packetbased strategy was proposed. The users were divided into several groups according to the strategy; certain subframes formed a superframe to enable different users to send Uplink Synchronization Code (SYNCUL) to the corresponding subframe of superframe when the users needed random access information, and based on it, priority was set for the users from different groups. Compared with the general strategy, packetbased strategy has greatly improved the success rate of the users’ access, and grouping based on priority was adopted to ensure a higher success rate for advanced users. The theoretical analysis and simulation results show that the proposed packetbased strategy can significantly improve the system Quality of Service (QoS) and could be an effective measurement for decreasing the probability of collision in random access.

Key words: TD-SCDMA, trunking, random access, Quality of Service (QoS), priority

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