Distributed intercell coordination through time reuse partitioning in downlink CDMA

Beyond 3G high speed cellular systems like HDR use a high speed downlink shared channel to provide users with services which are in many cases non real time. Each base station schedules transmissions to its users in a one by one fashion and transmits at its full power. In order to maintain an acceptable degree of fairness among users we should either assign more time slots to users at the cell boundary experiencing higher interference or use other means like intercell coordination to reduce users ´ received interference. This paper proposes a fixed distributed intercell coordination method where base stations in a cluster of neighboring cells transmit one by one in a round-robin fashion and further shows that this intercell coordination scheme does not necessarily benefit all users of a cell especially when there is a maximum data rate limit for some users due to hardware limitations. Thus in order to increase the efficiency of our fixed intercell coordination scheme we propose a time reuse partitioning algorithm similar to the channel reuse partitioning in narrowband cellular systems.