Hspa + Technology Impact On Tfrc Selection And Design

As the technologies of High Speed Downlink Packet Access (HSDPA) and High Speed Uplink Packet Access (HSUPA) are getting more mature and the new services are in continuous development, the data transmission speed that the mobile customers demanded nowadays is inevitably higher, so WCDMA has been on its way of evolution from HSPA(including HSDPA and HSUPA) to HSPA+. HSPA+keeps the characteristics of HSPA and completely compatible with it downwards. However,in order to support higher transmission speed and more abundant services, HSPA+applies some new techniques to WCDMA, suchasMIMO,64QAM, CELL-FACH enhancements, L2 enhancements and CPC.The selection of Transport Format and Resource Combination (TFRC) plays a key role on HSPA+implemented on Node B baseband. According to the practical conditions of the channels and network resources, it chooses appropriate transport format, distributing the proper HS-PDSCH channel codes, selecting the optimal modulation method, and indicating physical layer the transport format signal corresponding to the transmitted data TTI to realize the dynamic distribution of HSDPA physical resource in cells. Those new techniques mentioned above have significant influence on TFRC selection. In this thesis HSPA+and TFRC selection are deeply discussed and investigated. The main contents are as follows:First, WCDMA systems is first introduced and then its standards and evolution are analyzed. The concept of HSPA+is brought on. Second, some new techniques which have been introduced into HSPA+are studied, including MIMO, 64QAM, CELL-FACH enhancements, L2 enhancements and CPC. Meanwhile, the protocol investigation analysis of all those are presented. Third, the origin, essential and function of TFRC selection are discussed. The effect that all the techniques above on TFRC selection is also analyzed, which establishes a good foundation for TFRC design. Fourth, the scheme design and the implementing methods of TFRC selection are proposed. After the discussion and investigation on the key points of TFRC selectiom simulation tests are presented to make a decision on the choice of the scheme. Finally, TFRC selection is implemented on Node B baseband, all the tests are carried out. The results of the system testing are shown that the key characteristics of HSPA+, including MIMO,64QAM and L2 enhancements, are achieved on Node B.