Feasibility Conditions of SIR-based Power Control in TDMA Wireless Systems

Abstract -In this paper, the problem of SIR-based power control in narrowband wireless systems is revisited. Results on feasibility conditions of SIR-based power control are given. We stated and proved the relations between the achievable SIR and the link gain matrix in a narrowband system. Taking into account the orders of the realistic values for the problem quantities and assuming the desired SIR is chosen properly, then there exist infinite many solutions of the SIR-based power control problem. Otherwise, there is hardly a solution since the existence conditions are very restrictive. It is noticeable that these feasibility conditions have important implications on systems capacity and can be applied to call admission control(CAC). Based on the feasibility conditions, an improved stepwise removal algorithm (ISRA) is proposed for TDMA systems to achieve a better performance