Ristaniemi, “Downlink Power Control of Dedicated Channels in UTRA TDD”, in Proceedings of IEEE Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), Lisbon, Portugal, September 15–18, 2002, CD-ROM. Ristaniemi, “Handover and Uplink Power Control Performance in the 3.84 Mcps TDD Mode of UTRA Network”, Wireless Personal Communications, Vol. Toskala (eds.), WCDMA for UMTS, Wiley, New York, 2000. Since the effectiveness of this type of an algorithm depends on available signaling bandwidth that is used, a study is carried out to find the tradeoff between the signaling bandwidth and related network performance. Since it would be beneficial for the downlink inner loop power control to reach the target SIR as fast as possible, the power control step size based on the difference between the UE measured SIR and target SIR would be the most desirable power adjustment. Especially, the use of asymmetric step sizes for “power up” and “power down” commands is evaluated in contrast to the conventional symmetric power adjustment. Therefore, the effect of the inner loop algorithm to the performance of UTRA TDD network is studied in this paper. However, due to the time division feature and associated fexibility with asymmetry of TDD, the inner loop can not react as fast as in FDD and it is affected by rapid changes in environment. The current UTRA TDD downlink power control is similar to one in UTRA FDD mode, that comprises of closed inner loop and quality based outer loop. This paper discusses downlink inner loop power control of dedicated channels in UTRA TDD.
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