NDLI: Closed-loop power control algorithms in soft handover for WCDMA systems

Content Provider	IEEE Xplore Digital Library
Author	Grandell, J. Salonaho, O.
Copyright Year	2001
Description	Author affiliation: Nokia Networks, Finland (Grandell, J.)
Abstract	Closed-loop fast power control algorithms in a WCDMA system is discussed, dealing also with the special requirements set by using these algorithms when the mobile station is connected to more than one base station, i.e. in soft handover. The starting point for the discussion is the SIR-based algorithm, where the reliability of the decrease/increase-power command is evaluated from the SIR level. This algorithm was also the basis for 3GPP standardization work for WCDMA. A new method for establishing the reliability of the TPC command is introduced, where the soft symbol of the TCP command itself is directly used as a reliability indicator. In addition to the new reliability estimation, the concept of parallel use of TPC algorithms is presented, with a new TPC algorithm based on integrating TPC commands over a period of a few slots. The results show that the soft symbol reliability estimation decreases the Tx power levels with 0.5 dB, thus providing a useful capacity gain. The parallel use of 2 to 4 algorithms is also shown to decrease the sensitivity of the algorithms to the algorithm thresholds used, and thus increase the feasibility of the algorithms in a real-world network. The soft symbol reliability estimation for closed-loop power control was accepted by the 3GPP as a part of the WCDMA standard.
Starting Page	791
Ending Page	795
File Size	448491
Page Count	5
File Format	PDF
ISBN	0780370971
DOI	10.1109/ICC.2001.937347
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-06-11
Publisher Place	Finland
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power control Multiaccess communication Base stations Power measurement Power system reliability Standardization Bit rate Downlink Rayleigh channels Time measurement
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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