TD-SCDMA HSUPA系统中的E-TFC选择的研究

在HSUPA系统中实现E-TFC的选择过程较以前的TFC的选择过程相对复杂，E-TFC的选择过程包括确定发送数据的逻辑信道集合、确定物理资源可以支持的传输块大小及从已经确定的逻辑信道集合中生成满足传输块大小的最大的MAC-e PDU 3个过程。介绍了TD-SCDMA HSUPA系统中终端的E-TFC选择过程及其基本实现步骤，并在此基础上对其实现算法进行分析，提出了一种简单易行的实现方法，并且分析了其实现精度要求。提出的方法通过先确定大致功率范围，再进行精确计算的方法，避免了繁琐的生成集合再进行判断的步骤，使得运算量急剧减少。通过对公式改造把小数计算转化为整数计算，非常利于终端实现，对TD-SCDMA HSUPA系统中终端的开发工作具有很好的应用价值。

Research of E-TFC selection in HSUPA TD-SCDMA system

The E-TFC selection process in HSUPA system is more complicated than TFC selection process in TD-SCMDA system. E-TFC selection process comprises the process of determining the set of logical channels which has transmission data and the process of determining the transport block size that can be supported by the resources and the process of generating the largest MAC-e PDU satisfied the transport block size from logical channel set. This paper introduces the E-TFC selection process and basic implement steps by UE in HSUPA TD-SCDMA system. Then it analyzes this implement arithmetic and puts forward one implement method that is simple and easier to operate. And then, the precision demand of this implementation method is discussed. The paper affords a method that can avoid complicated calculate step. It decides the power scope firstly, and then finds precise transport block size. So its operation is cut down extremely. At the same time, the change formula from fraction to integer is benefit for terminal implementation. This method can be applied to the development of UE in HSUPA TD-SCDMA system.