Performance of TDD-SDMA/TDMA system with multi-slot assignment in asymmetric traffic wireless network

This paper proposes a TDD-SDMA/TDMA system with a multi-slot assignment to deal with asymmetry traffic in wireless networks, where the packet-based data services is supported. The proposed system assigns more than one time slots for downlink to each terminal so as to deal with the asymmetric traffic. We also present an efficient algorithm to decide the priority of time slots for downlink, by which the maximum of potential transmission rate for downlink can be obtained. The performance of the proposed system is evaluated by computer simulation in terms of the average delay and the average transmission rate and compared with those of a conventional system with a symmetric time slots assignment. It is verified that a significant improvement on system performance can be achieved if the TDD-SDMA/TDMA system employs the proposed multi-slot assignment scheme.