A new optimization model for dynamic power and sub-carrier allocations in packet-centric OFDMA cells

It is well known that applying dynamic resource allocation to down-link transmissions of OFDMA systems provides a significant performance increase, by taking advantage of diversity effects. In order to quantify the maximum possible gain achievable by applying dynamic mechanisms, several optimization problems have been suggested for studying a dynamic system's optimal behaviour. However, so far these optimization approaches do not take sophisticated system requirements into account, as there are different packet-arrival processes, buffering constraints, scheduling policies, as well as QoS requirements per service class. In this paper we present a new optimization model that is based on a packet-centric system view and includes the system requirements mentioned above. We compare the performance results of the conventional and the new approach and study the impact of dynamic power. allocation in both cases.