Distributed timeslot allocation with crossed slots in CDMA-TDD systems

Code division multiple access system with time division duplex (CDMA-TDD) is a promising solution to cope with traffic asymmetry of downlink and uplink in multimedia services. When a rate of asymmetry is different in each cell, CDMA-TDD system may employ crossed slots, where a timeslot is used for different links in cells. However, it may suffer from base station (BS)-to-BS and mobile station (MS)-to-MS interference problem. Zone division scheme is an efficient way to tackle the crossed slot interference by dividing a cell into inner and outer zones and restricting communication in crossed slots only to inner zone. In this paper, we propose distributed crossed slot resource allocation with zone division in multi-cell CDMA-TDD system. Two conditions for crossed slot resource allocation are defined and the bound on the size of inner zone is analyzed mathematically based on the conditions. Relationship between the capacity of crossed slot and the size of inner zone is also analyzed. Then...

• Type: Journal
• Year: 2010
• Where: WICOMM
• Authors: Ki Won Sung, Chae Y. Lee
• Keywords: Crossed Slot, Traffic Asymmetry, WICOMM 2010, Zone Division