Hierarchical Scanning Algorithm for Integrated Mobile and Nomadic Access Systems

Abstract

In next generation wireless networks, not only wide area cells to provide moderate data rate with full mobility but also local area cells to support high data rate with local mobility will be deployed. In addition, numerous local area cells may be located within the coverage of wide area cells to increase overall network capacity and offer high quality services. In this circumstance, a scanning operation to detect suitable local area cells for handoff can degrade the performance of a mobile station since repeated trials of scanning are likely to cause service disruption and considerable power consumption. To solve these problems, we propose a hierarchical scanning algorithm that enables the mobile station to obtain the neighbor cell information corresponding to its own situation. We present an analytical model for the proposed algorithm and evaluate its efficiency in terms of the time spent in the scanning operation. Simulation results show that the proposed algorithm requires much less time to detect suitable local area cells for handoff than a non-hierarchical scanning algorithm, which is conventionally used.

Estimation‐based cell search method for a mobile relay deployed on a moving network

“…Figure 13 shows the number of measurements according to the non-coherent and coherent detection methods. It is calculated by using (15). The velocity is 240 km/h.…”

“…In , methods of reducing service interruption due to the cell search procedure are described. In , the authors proposed an adaptive channel scanning algorithm.…”

“…It is difficult to apply the adaptive scanning algorithm on the MR because the MR can not recognize the detailed characteristics of the service supported by the MS. In , the scanning priority of the neighbor BSs is differentiated based on the connection history to reduce the cell search delay. However, the MS still experiences service interruption caused by the cell search procedure of the MR.…”

“…lDL P/ l 1 P D .1 P/ L 1 < 0.05 ) L D˙log .1 P/ 0.05(15) The cell detection probability according to the signal quality and the velocity.…”