DocumentCode :
3590707
Title :
A combined rate/power/cell control scheme for delay insensitive applications in CDMA systems
Author :
Anpalagan, Alagan S. ; Sousa, Elvino S.
Author_Institution :
Dept. of Electr. & Comput. Eng., Toronto Univ., Ont., Canada
Volume :
1
fYear :
2000
fDate :
6/22/1905 12:00:00 AM
Firstpage :
256
Abstract :
A novel combined rate, power and cell (R/P/C) control scheme that gracefully implements congestion control, is proposed and studied. We consider the reverse link in a CDMA network with a high degree of traffic fluctuations spatially with time, as would be the case in future wireless systems. Our scheme attempts to reduce the high interference power variations among cell-site antennas that can exist in a real network. The transmission rates of those users in the congested (non-congested) cells are decreased (increased) providing the required average throughput among users; hence, the proposed scheme is appropriate for delay insensitive applications. We consider the minimization of the average transmit bit energy (Θ) subject to maintaining individual target Eb/I0 for each user. Two algorithms, one directly minimizing Θ and the other indirectly using measured pilot power, are given. Both algorithms select the optimal cell-site if forward and reverse link gains are equal; however, the latter is decentralized and uses only local measurements and amenable for practical implementation. Simulation results show that a 20% reduction in transmit bit energy can be achieved on average using our schemes over the scheme with no rate control
Keywords :
cellular radio; code division multiple access; delays; interference suppression; multiuser channels; power control; radio links; radiofrequency interference; telecommunication congestion control; CDMA systems; average throughput; average transmit bit energy minimisation; cell-site antennas; combined rate/power/cell control; congested cells; congestion control; decentralized algorithm; delay insensitive applications; interference power variation reduction; measured pilot power; noncongested cells; reverse link; reverse link gain; simulation results; traffic fluctuations; transmission rates; wireless systems; Control systems; Delay; Educational institutions; Energy measurement; Fluctuations; Interference; Minimization methods; Multiaccess communication; Switches; Throughput;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Global Telecommunications Conference, 2000. GLOBECOM '00. IEEE
Print_ISBN :
0-7803-6451-1
Type :
conf
DOI :
10.1109/GLOCOM.2000.892012
Filename :
892012
Link To Document :
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