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A Dynamic Channel Allocation Employing Smart Antenna to Resolve a Crossed Time-slot Problem in TD-SCDMA  

Kim, Eun-Heon (인하대학교 정보통신공학과 무선통신 연구실)
Park, Jae-Hyun (인하대학교 정보통신공학과 무선통신 연구실)
Kim, Duk-Kyung (인하대학교 정보통신공학과 무선통신 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.32, no.12A, 2007 , pp. 1276-1285 More about this Journal
Abstract
Since the TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) system is based on TDD (Time Division Duplexing), the uplink and downlink can be allocated asymmetrically according to the traffic e.g. Web browsing. Although this asymmetric allocation can increase the frequency utilization, it may cause time slot opposing, which implies the time slot is assigned in opposing direction between cells. The time slot opposing can generate significant interference between cells, which results in severe performance degradation. In the paper, a novel dynamic channel allocation (DCA) is proposed in the TD-SCDMA system, to mitigate the impact of time slot opposing considering smart antenna. When the smart antenna is applied in the system, the inter-cell interference is largely affected by beam pattern and beam direction between neighboring cells. Therefore, the time slot opposing and smart antenna should be considered together in the DCA. The intensive simulations show that the proposed scheme can improve the system capacity compared to the conventional DCA schemes.
Keywords
TD-SCDMA (Time Division-Synchronous Code Division Multiple Access); Dynamic Channel Allocation (DCA); TS Opposing; Smart antenna;
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