Performance Analysis in Double Layer Cellular Network with New Call Bounding Scheme and Directed Retry
Abstract
Overlapping coverage area of nearby base stations can be utilized by the mobile users to access channels from more than one base station. This facility of the cellular system improves the performance of teletraffic systems. In the present study, we develop an analytical model for evaluating the blocking probabilities in the double layer cellular network. The double layer cellular architecture is dedicated to micro cell and macro cell layers. These two layers deal with two different types of terminals i.e. high speed moving terminals (HSMTs) and low speed moving terminals (LSMTs). The concept of new call bounding scheme is proposed in the micro cell layer along with subrating scheme to admit more handoff attempts. In case when all the channels are busy, the low speed handoff attempts may retry for a channel in the neighboring base station. By using iterative algorithm, we calculate the rate by which attempts are made to retrying for the service. Various performance indices are obtained in terms of steady state probabilities. Numerical illustration is provided to demonstrate the tractability and validity of the analytical model for real time system.
Keywords
Cellular Network, Multi-Layer Architecture, Channel Assignment Scheme, Handoff Calls, Guard-Channel, Sub Rating, Directed Retry, Blocking
