Kuek Swee Syn Simon
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Publication Dynamic channel assignment with queuing in highway microcells(1993-01-01) Kuek, S.S.; Wong, W.C.; ELECTRICAL ENGINEERINGThe effects of queuing on an ordered dynamic channel assignment with reassignment (QODCAR) scheme in a highway microcellular environment are studied. Results show that queuing improves channel use by approx.9-43%, and significantly lowers the probability of call failure.Publication Predictive load-sharing scheme in a microcellular radio environment(1993-11) Kuek, S.S.; Wong, Wai-Choong; Vijayan, Rajiv; Goodman, David J.; ELECTRICAL ENGINEERINGIn a metropolitan microcellular environment, the cell coverage zone can be highly irregular. Thus highly overlapping areas can result due to an attempt to achieve ubiquitous coverage. We propose a predictive load sharing (PLS) scheme to alleviate localised congestion by using the knowledge of users potentially entering and leaving a cell. We study the system in a linear bidirectional highway environment. Results show that load carried is increased and the handsoff failure rate is lowered compared to the Fixed Channel Assignment (FCA) scheme. A lower handsoff failure rate is a desirable since the forced termination of an existing call can be very annoying to a user.Publication Priority handoff analysis(1994-04) Xie, H.; Kuek, S.; ELECTRICAL ENGINEERINGHandoff will become an increasingly important issue in mobile phone communications, especially in microcellular systems with the increase of handoff traffic between cells. Many approaches have been proposed for handoff analysis. In a previous analysis, it was assumed that the probability density function (pdf) of the speeds of cell-crossing terminals is the same as the pdf of the speeds of all terminals. In contrast to this assumption, we argue that both pdf's are unequal. The pdf of the speeds of cell-crossing terminals is given by a "biased sampling" formula. This boundary condition is used in our study and improves the accuracy of performance measures in handoff analysis. In previous work, a priority handoff system which has dedicated channels for handoff calls and uses a blocked call cleared (BCC) policy has been analyzed. In this paper, we use a different approach in performance analysis. The proposed approach has low computational complexity and high accuracy. © 1994 Plenum Publishing Corporation.Publication Approximate analysis of a dynamic-channel-assignment scheme with handoffs(1994-04) Kuek, S.S.; Wong, W.C.; ELECTRICAL ENGINEERINGAn approximate analysis for a dynamic-channel-assignment (DCA) scheme with handoffs is proposed. In a DCA scheme, there is no fixed relationship between channels and cells. Channel usage in a cell is subject to cochannel-interference constraints owing to the shared use of the same channel in nearby cells. This causes exact analysis of DCA schemes to be highly complex even in the absence of handoffs. An approximate analysis for a DCA scheme, called the ordered dynamic-channel-assignment (ODCAR) scheme, is proposed which takes into consideration handoff calls. The analysis results are compared with simulation results for a linear-highway microcellular system. The analysis proposed is simple and shows good approximation to the simulation results for the system parameters used. It is shown, also, that the ODCAR scheme performs close to a full-access system.Publication Analytical model for variable partition duplexing(1993-01-01) Wong, W.C.; Kuek, S.S.; ELECTRICAL ENGINEERINGAn analytical model to describe the statistical multiplexing performance in a variable partition duplexing (VPD) multiple access scheme is described. The analytical and simulation results are shown to agree closely for a variety of conditions.Publication Dynamic load sharing for asymmetrical microcellular teletraffic conditions(1991-01-01) Kuek, S.S.; Wong, W.C.; ELECTRICAL ENGINEERINGIn a highway microcellular structure, accidents and road works result in localised congestions contributing to asymmetrical teletraffic load situations. A dynamic load-sharing scheme based on a reconfigurable overlapped cellular coverage is investigated for various teletraffic conditions. System performance in terms of the probabilities of new calls blocked and handoff failure are improved significantly with this scheme.Publication Predictive load-sharing scheme in a microcellular radio environment(1993-11) Kuek, S.S.; Wong, Wai-Choong; Vijayan, Rajiv; Goodman, David J.; ELECTRICAL ENGINEERINGIn a metropolitan microcellular environment, the cell coverage zone can be highly irregular. Thus highly overlapping areas can result due to an attempt to achieve ubiquitous coverage. We propose a predictive load sharing (PLS) scheme to alleviate localised congestion by using the knowledge of users potentially entering and leaving a cell. We study the system in a linear bidirectional highway environment. Results show that load carried is increased and the handsoff failure rate is lowered compared to the Fixed Channel Assignment (FCA) scheme. A lower handsoff failure rate is a desirable since the forced termination of an existing call can be very annoying to a user.