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2000 International Conference on Communication Technology(WCC2000·ICCT2000)

作者： Kohji Takeo Shinichi Sato YRP Mobile Telecommunications Key Technology Research Laboratories YRP Center No.1 Building 6F3-4 Hikari-no-okaYokosuka239-0847 Japan Oki Electric Industry

＜正＞The communications quality differs between cells when there is traffic deviation in the service area of CDMA cellular *** variance in communications quality degrades the system *** propose a scheme that controls the transmission power to mobile stations（MS） in soft handoff region to reduce the difference in downlink quality between *** power ratio to MSs under soft handoff is adaptively controlled between base *** evaluation results show that the quality difference between cells can be reduced using the proposed scheme.

关键词： CDMA soft handoff Power control Non-uniformity

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Forward Link Power Control Strategy and its Optimum Issue in CDMA Cellular Networks

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The Journal of China Universities of Posts and Telecommunications 2000年第4期7卷 1-11,67页

作者： ZHOU Jie CHEN Ji-nu Department Computer Science Faculty of EngineeringGunma UniversityKiryu City376-8515 Japan Chongqing University of Posts and Telecommunications Chongqing 400065P.R.China

In this paper, we propose a theoretical method in order to estimate the forward link outage probability and user capacity of a cellular system which are based on IS 95 CDMA standard, especialy impact of power control strategy and voice activity monitoring in the system under long term fading effects, in which the light and heavy fadings are considered. According to the numerical results obtained in this paper, the power control strategy leads to approximately the threefold user capacity in contrast to the situation without power control strategy. The reults are compared with Interference to Signal Ratio( ISR ) driven power control scheme [6][9] which can be used only for simulation of the system. The power control strategy not only improves the desired signal to the interference ratio in the reference users receiver, but also offers uniform service to the user wherever it is located in the cell.

关键词： forward link ( base station-to-mobile ) reverse link ( mobile-to-base station ) τth power of distance driven ISR driven soft handoff macrodiversity long-term fading

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An Efficient Algorithm to Solve the Problem of Dropped Call in CDMA Cellular Systems

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The Journal of China Universities of Posts and Telecommunications 2000年第1期7卷 99-103页

作者： DENG Wei, AI Bo (College of Computer Science and Technology, Beijing University of Posts and Telecommunications, Beijing 100876, P.R. China ) College of Computer Science and Technology Beijing University of Posts and Telecommunications Beijing 100876 P.R. China

In the mobile environment, the dropped calls can be resulted from shadowing and rapid signal loss. As the cells shrink to accommodate an increasingly large demand for services, the dropped-call recovery procedure will become more important over the air interface. But in the current protocols, the recovery procedure is too simple to demonstrate the procedure. In this paper, we present a Transparent Reconnection Procedure (TRP) which is an efficient algorithm that can be adapted easily to the benefit of decreased dropped calls. In the simulation of a typical cellular system, it is shown that there are fewer dropped calls using TRP compared to the conventional procedure. This benefit comes at the expense of a slight increase (less than percent 1) in blocked call percentage. It depends on some relevant system parameters, the values of which are decided by the operators accordingly.

关键词： CDMA reconnection TRP soft handoff drop out

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