Performance Comparison on Schemes for Suppressing Cross-Slot Interference in TD-SCDMA System

Slow dynamic channel allocation (Slow DCA) is a key technology used to support asymmetrical services between uplink and downlink in TD-SCDMA system, which may cause cross-slot interference when a cell is active in downlink slot while an adjacent one is in uplink slot. The crossed slot existing among adjacent cells will seriously affect the system performance. In this paper, we give a brief analysis about how the cross-slot interference emerges and how it influences TDSCDMA system. Three schemes commonly used to suppress this interference are introduced. One is based on slots allocation direction, and the other two are separately based on region division in a cell and "virtual cell". Performances of each scheme are compared in an OPNET simulation scenario. Results show that the scheme based on "virtual cell" has a better performance compared with the other two schemes and it is proved to be the most practical one in the three schemes for solving the cross-slot problem.