Performance Analysis of Fractional Guard Channel Scheme with Buffer for Cellular Mobile Networks
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RESEARCH ARTICLE
Performance Analysis of Fractional Guard Channel Scheme with Buffer for Cellular Mobile Networks Rakhee Kulshrestha1
•
Madhu Jain2 • Shruti1
Received: 9 April 2018 / Revised: 21 April 2019 / Accepted: 11 July 2019 The National Academy of Sciences, India 2019
Abstract In this paper, we have developed an efficient channel assignment scheme using fractional guard channel for utilizing the limited radio recourses efficiently and seamlessly by providing buffer for good-quality signal calls to improve the quality of service. Two models are proposed to prioritize good-quality handoff calls over poor-quality calls. The expressions for blocking probability, call dropped probability of handoff calls, utilization of channels and buffer are obtained for a cellular radio network. Numerical simulation results for both the models illustrate the impact of different parameters on the key performance measures. Keywords Cellular network Poor and good quality signals Fractional guard channel scheme Blocking probability Utilization of channels Utilization of buffer
1 Introduction The demand for investigation of quality of service (QoS) requirements for wireless and cellular networks in order to support multimedia applications is on a steep rise among & Rakhee Kulshrestha [email protected] Madhu Jain [email protected] Shruti [email protected] 1
Department of Mathematics, Birla Institute of Technology and Science, Pilani, Rajasthan, India
2
Department of Mathematics, Indian Institute of Technology Roorkee, Roorkee, UK 247667, India
the consumers. These requirements often lead to network congestion and call drops. The expectations of users may differ from different network-based applications. The classification of applications is done based on different technology attributes and human perception in order to establish the acceptable QoS levels [1]. In order to maintain the provided QoS and to support users’ mobility, handoff mechanism is a key element of wireless cellular networks. The limitation of allocated bandwidth highly influences the perceptions of QoS for end users, so efficient utilization of bandwidth during handoff is one of the main factors which govern the design of admission control in a cellular network. As a result, the blocking probability of new calls and the dropping probability of handoff calls are two important indices to evaluate QoS performance for cellular communication networks. The process of transferring a call in progress from one base station to another due to mobility of user through the coverage area of a base station (BS), termed as handoff, must be smooth to the mobile terminal (MT). If a handoff is requested and no channel is available in the target cell, then the active call is dropped due to handoff failure. However, from users’ point of view, the dropping of an active call is more undesirable than blocking of a new call request for channel. Handoff prioritization schemes effectively reduce handoff dropping probability at the cost of increase in
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