Time slot allocation scheme based on a region division in CDMA/TDD systems

In wireless multimedia networks, there exists traffic asymmetry between uplink and downlink channels. The CDMA/TDD system can alleviate this problem, however previous work in this area can not manage efficiently the traffic asymmetry among cells. In this paper we propose a new time slot allocation scheme that considers the traffic pattern of each cell. To solve the inter-cell interference problem, we divide a cell's area into two regions and we allocate the resource of crossed slots to mobile stations which are existing in the inner-region. This proposed scheme increases the resource utilization and decreases the blocking probability of the system as a whole. And our DARD(Different time slot Allocation based on a Region Division) scheme outperforms conventional SA(Same time slot Allocation) scheme in the heterogeneous traffic environment.