Handoff and resource management in a multi-code CDMA system = 다중부호 부호분할다중접속 시스템에서 핸드오프 및 자원 관리

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In this dissertation, we are concerned with capacity estimation, soft handoff modeling, and its management in multi-code (MC) CDMA systems. First, we analytically estimate the reverse-link capacity of a signal-to-interference ratio (SIR)-based power-controlled direct sequence (DS) CDMA system supporting ON-OFF traffic. Since, in an SIR-based power control system, the power level is a function of the number of active home users and the amount of total other cell interference, power level and total other cell interference can be calculated by a recursive method. SIR-based power control systems yield a higher system capacity than strength-based power control systems, which mainly results from smaller other cell interference. System capacity is largely affected by the activity factor, propagation parameters, the maximum received power, and the required $E_b/I_o$. Second, we extend the analysis of an SIR-based power-controlled DS-CDMA system for an MC-CDMA system supporting heterogeneous CBR and ON-OFF traffic by adopting a Gaussian model for other cell interference. System capacity is derived in terms of admissible regions satisfying the maximum allowable outage probability. Third, we characterize soft handoff in CDMA systems. Handoff call attempt rate and channel holding time are derived based on soft handoff. An overlap region is used in soft handoff analysis in addition to an inner cell, an outer cell, and a soft handoff region. An SR is divided into a number of overlap regions according to cell structure, and some new parameters are developed. The performance of soft handoff systems is numerically evaluated to investigate the effects of the above parameters and is compared with hard handoff systems. Finally, we propose a traffic management scheme in an MC-CDMA system supporting soft handoff, which uses guard channels and a queue for realtime traffic. Reservation-on-Demand queue control is suggested to give a priority to queued handoff calls. Handoff traffic...
Sung, Dan-Keunresearcher성단근researcher
한국과학기술원 : 전기및전자공학과,
Issue Date
150986/325007 / 000945044

학위논문(박사) - 한국과학기술원 : 전기및전자공학과, 1999.2, [ x, 164 p. ]


Capacity estimation; Soft handoff; Multi-code CDMA; Reservation-on-demand control; 주문형 예약 제어; 용량 예측; 소프트 핸드오프; 다중코드 CDMA

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