Title :
A lower bound on SINR threshold for call admission control in multiple-class CDMA systems with imperfect power-control
Author :
Ahmed, Mohamed H. ; Yanikomeroglu, Halim
Author_Institution :
Fac. of Eng. & Appl. Sci., Memorial Univ. of Newfoundland, St. John´´s, Nfld., Canada
fDate :
29 Nov.-3 Dec. 2004
Abstract :
Call admission control (CAC) is essential to guarantee the signal quality in CDMA systems. Signal-to-interference-and-noise ratio (SINR) is used as the criterion for user admission by comparing the SINR with a predefined threshold value (SINRth). Lowering this threshold level is desirable to reduce the blocking rate. However, a lower bound of SINRth is vital to keep the outage probability (Pout) below a maximum value. In this paper, we derive this lower bound of SINRth (SINRth-lb) for multi-class CDMA systems with imperfect power control. SINRth-lb of class i (SINRth-lb(i), i=1, 2,...., L) is determined by finding the relationship between Pout(i) (i=1, 2,...., L) and SINRth(i) (i=1, 2,...., L) where L is the number of classes. Then, SINRth-lb(i) is determined as the lowest value of SINRth(i) that keeps the outage probability of all classes below the corresponding maximum values.
Keywords :
code division multiple access; telecommunication congestion control; CAC; SINR threshold lower bound; blocking rate; call admission control; imperfect power-control CDMA systems; multiple-class CDMA systems; outage probability; signal quality; signal-to-interference-and-noise ratio; user admission criterion; Admission control; Bit error rate; Broadband communication; Call admission control; Fluctuations; Multiaccess communication; Power control; Power engineering and energy; Signal to noise ratio; Wireless communication;
Conference_Titel :
Global Telecommunications Conference, 2004. GLOBECOM '04. IEEE
Print_ISBN :
0-7803-8794-5
DOI :
10.1109/GLOCOM.2004.1378956