| Abstract |
In this paper, we discuss resource management in modern
wireless communications with the objective of minimizing power consumption, and carry out an analysis of different resource allocation schemes in interference environment. Based on a two-link line model with path-loss only, the performances of ST (Simultaneous Transmission), TDMA and FDMA schemes for network power minimization under specified rate constraints are investigated. It is found that TDMA scheme always consumes more power than FDMA scheme for
achieving the same QoS (Quality of Service); and ST scheme consumes less power than FDMA close to the base station, but much more power or even not satisfying the rate requirements in the cell-edge area. This illustrates that the ST/FDMA selection criterion for sum power minimization is location-dependent. Further, numerical results suggest that the ST/FDMA selection margin is generally dominated by
their network rate constraints rather than the rate proportion between the two links. Apart from these, new definitions of power-efficiency and fairness metrics are further proposed, following by the design of weighted resource allocation approaches based on power-efficiency and fairness tradeoffs. |