SINR threshold lower bound for SINR-based call admission control in CDMA networks with imperfect power control

Signal to interference plus noise ratio (SINR)-based call admission control schemes admit calls as long as SINR is higher than a threshold value (SINR/sub th/). Setting a relatively low SINR/sub th/ results in more users admitted into the system and this in turn yields an increased outage probability (P/sub out/). Hence, determining the lower bound of SINR/sub th/ (SINR/sub th/spl I.bar/lb/) is vital to keep P/sub out/ below a maximum value, P/sub out/spl I.bar/max/x. In this letter, we derive SINR/sub th/spl I.bar/lb/ in the reverse link of CDMA systems with imperfect power control by finding the relationship between P/sub out/ (due to power control infeasibility and SINR fluctuation) and SINR/sub th/. Then, SINR/sub th/spl I.bar/lb/ is determined as the lowest SINR/sub th/ that keeps P/sub out/ below a certain P/sub out/spl I.bar/max/.