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Region division assignment of orthogonal variable-spreading-factor codes in W-CDMA

机译：W-CDMA中的正交可变扩频因子代码区的区域划分分配

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This work focuses on the problem of efficient assignment of the orthogonal-variable-spreading-factor (OVSF) codes for multimedia communications in W-CDMA systems. Due to the problem of code blocking in OVSF-code assignment considered by Minn and Siu, and the different probability of requests for each data rate, the OVSF-code assignment algorithms proposed so far cannot efficiently serve the high-rate requests when traffic load is high. Even though Minn and Sin proposed the algorithm to completely eliminate the code blocking, the system implemented with such the algorithm has the lower number of simultaneous voice conversations than the one of the system with the code blocking problem. To efficiently provide the services for all supported rates, we propose an OVSF-code assignment scheme called the region division assignment (RDA). The performance of the proposed RDA scheme is evaluated by simulation for voice and video sources based on the multiple access protocol in UMTS/IMT-2000.
机译：这项工作侧重于W-CDMA系统中的多媒体通信的正交变量扩展因子（OVSF）代码的有效分配问题。由于Minn和Siu考虑的OVSF代码分配的代码阻塞问题，以及每个数据速率的请求的不同概率，到目前为止所提出的OVSF代码分配算法无法有效地服务于交通负载时的高速率请求高的。尽管Minn和Sin提出了算法来完全消除代码阻塞，但是用这种算法实现的系统具有比具有代码阻塞问题的系统之一的同时语音对话的数量较小。为了有效地为所有受支持的速率提供服务，我们提出了一个称为区域分配（RDA）的OVSF代码分配方案。所提出的RDA方案的性能是通过基于UMTS / IMT-2000中的多访问协议的语音和视频来源进行仿真来评估的。

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