Base station placement in asymmetric TDD mode systems in a Manhattan environment

With time division duplexing (TDD), radio resources can be flexibly divided between uplinks and downlinks. This makes TDD suitable for handling the increasingly asymmetric traffic generated by data and multimedia services. When asymmetries are different in neighbouring cells, adverse interference conditions can arise, however. The paper investigates how base station (BS) placement affects the performance of a TDD mode system with asymmetric links in a Manhattan like environment. In particular, the influence of BS placement on inter-base station interference (IBI) and inter-mobile interference (IMI) is assessed. Results show that, similar to conventional systems with symmetric traffic, it is preferable to place BSs somewhere between intersections rather than in intersections. Though the interference mechanisms are different, the studied asymmetric systems seem to be no more vulnerable to an in-intersections placement than is a symmetric system.