Robust Uplink Resource Allocation in CDMA Cellular Radio Systems

Radio resource management (RRM) in cellular radio system is an example of automatic control. The system performance may be increased introducing decentralization, shorter delays and increased adaptation to local demands. However, it is hard to guarantee system stability without being too conservative while using decentralized resource management. In this paper, two alogrithms that both guarantee system stability and use local resource control are proposed for the uplink (mobile to base station). While one of the algorithms uses only local decision, the other uses a central node to coordinate resources among different local nodes. In the chosen design approach, a feasible solution to the optimization problems corresponds to a stable system. Therefore, the algorithms will never assign resources that lead to an unstable system. Simulations indicate that the proposed algorithms also provide high capacity at any given uplink load level.