시분할-코드분할 다중 접속 시스템에서의 비대칭 트래픽에 대한 수학적 분석
(A) Mathematical Analysis of Asymmetrical Traffic in TD-CDMA Systems
시분할 코드분할 다중 접속 시스템;
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This thesis proposes a mathematical model to analyze call- and packet-level performance of the TD-CDMA/TDD system which could serve a flexible radio resource management against multi-type heterogeneous and asymmetrical traffic conditions. On call-level analysis, the mathematical model based on queueing theory performs multi-dimensional operations using random vectors or matrices to consider multiple types of traffic and also deal with asymmetrical up- and down-direction transmissions separately. Employing the mathematical model, we obtain call blocking probability for each type of traffic and also the optimum switching-point with the smallest call blocking probability. And on packet-level analysis, employing a non-prioritized queueing scheme between circuit and packet calls, we solve 2-dimensional random vector problem composed of the queue length for packets and the number of circuit calls being served. Finally, packet-level performance is analyzed in terms of the packet loss probability and the buffer size required under mixed-traffic conditions of multiple types of circuit and packet calls.