Optimal cross-layer design for throughput maximisation of multi-class VSG CDMA in rayleigh fading channel

In this paper, we propose a joint throughput maximisation across the physical and call admission control (CAC) layer for multi-class VSG CDMA systems in a Rayleigh fading environment. The system model is firstly analysed and a new exact closed-form of the physical layer constraint is derived. We show that it is possible to transform the set of the exact physical layer constraints into the expression of the admission region. This facilitates formulating a linear cost function, which is modeled by semi-Markov decision processes (SMDPs), and results in an accurate cross-layer optimisation design. With the proposed technique, the maximum throughput is achieved by linear-programming approach as well as the QoS requirements of both layers are guaranteed. Based on the numerical results, the system performance is improved up to 50% in terms of throughput and blocking probability