Research On The Power Control Of HSUPA In WCDMA

The 3GPP introduced HSUPA(High Speed Uplink Packet Access) technology in R6(Release 6) for improving the data transfer rate and system capacity of the uplink WCDMA system. The HSUPA technology, the R99(Release 99) compatible version, realized high-speed packet data transmission on the uplink (2Mbps of the 10ms mode, 5.4 Mbps of the 2ms mode)through the use of rapid HARQ(Hybrid Auto Retransmission Quest)terminated in Node B, 2ms short frame and quick scheduling techniques.The WCDMA system is the self-infection system.The UE's transmission power is the interferenceof the other user within the same cell. So, it is necessary to limit the UE's transmission power and make the total power of the system keep the minimum level. Therefore, it is significantly important to study the power control technology of WCDMA system in HSUPA needed to achieve the better performance.The method of combining the innerloop and outerloop power control in WCDMA system was used to achieve the minimum total power level of the power control system and maintain the QoS(Quality of Service) of the traffic. It is the mainly same between the inner-loop power-control of HSUPA and R99, but the RNC(Radio Network Controller) adjustment factors of the outer-loop power-control were changed from the BLER, CRCerror of R99 to the HARQ-failure and RSN(Retransmission Number) of HSUPA.The inevitable false alarm and missing alarm caused the inaccuracy of the HARQ failure seriously affecting the accuracy of the RNC's outloop power control and probably causing the collapse of the whole system. This problem was solved in this article through proposing a reasonably false-alarm and leakage alarm threshold to lower their statistics report on the impact HARQ failure. Practical experiment and system test indicate that the proposed method can overcome the false-report of HARQ-failure resulting from the wrong false-alarm and missing-alarm, effectively, and this design can be used to improve the robustnes and stability for RNC performing outer-loop power-control and for UE obtaining SG in HSUPA.