GSM/GPRS分裂信道高效重分配策略  

Efficient split-channel re-allocation scheme for GSM/GPRS

作　　者：蒋体钢[1,2] 范平志[2] Kam-Yiu Lam Yi Pan 

机构地区：[1]电子科技大学通信抗干扰国家级重点实验室,四川成都610054 [2]西南交通大学移动通信研究所,四川成都610031 [3]香港城市大学计算机科学系 [4]美国乔治亚州立大学计算机科学系

出　　处：《电路与系统学报》2008年第4期1-6,共6页Journal of Circuits and Systems

基　　金：国家自然科学基金"两个基地"项目(60440420451);香港城市大学研究基金资助项目

摘　　要：现有GSM/GPRS系统各种信道分裂策略都仅限于话音呼叫,即仅允许分裂信道分配给话音呼叫而不允许分配给包呼叫。因而,当系统没有空信道时,即使可以提供分裂信道,一个新到达的包呼叫也将被阻塞。本文提出的分裂信道重分配策略允许话音呼叫和包呼叫均可获得分裂信道,论文还研究了包呼叫得到分裂信道的条件。研究结果表明,允许将分裂信道分配给新到达包呼叫可以获得更优越的性能;在本文的参数设置下,在门限参数θ=2/3时,新策略的话音阻塞率和平均包传输时间没有明显恶化,而包阻塞率和平均信道利用率却得以显著改善。In the existing GSM/GPRS systems, the channel de-allocation schemes only allow the de-allocated channels to be allocated to the voice calls, not to the new packets calls. So when there is no idle channel, a packet call will be blocked even there exist ongoing packets calls which can be de-allocated. In this paper, a new de-allocation scheme which allows the de-allocation channels be used by both voice calls and packets calls is proposed, and the de-allocation threshold for new packets calls is also studied. Our results show that the new scheme can achieve excellent performance; when the threshold θ= 2/3, the blocking probability of voice calls and the mean packet transmission time have nearly no degradation, while the blocking probability of packets calls and mean channel utilization are improved significantly.

关 键 词：GSM/GPRS 信道分裂 信道分配 

分 类 号：TN929.53[电子电信—通信与信息系统]