Title: Application of adaptive guard channel reservation under hard handoff constraint in wireless cellular network

Authors: Promod Kumar Sahu; Hemanta Kumar Pati; Sateesh Kumar Pradhan

Addresses: Department of Computer Science and Application, Utkal University, Bhubaneswar, Vani Vihar, Odisha, India ' Department of Computer Science and Engineering, International Institute of Information Technology Bhubaneswar, Bhubaneswar, Odisha, India ' Department of Computer Science and Application, Utkal University, Bhubaneswar, Vani Vihar, Odisha, India

Abstract: Voice is the king of communication in wireless cellular network (WCN). Again, WCNs provide two types of calls, i.e., new call (NC) and handoff call (HC). Generally, HCs have higher priority than NCs because call dropping gives negative impact to users as compared to call blocking. So, to handle this problem some channels are reserved for HCs. If more channels are reserved for HCs, then handoff call dropping probability (HCDP) decreases at the same time as new call blocking probability (NCBP) increases; if fewer channels are reserved for HCs, HCDP increases and NCBP decreases. If channels are reserved for HCs by considering target HCDP then HCDP will be below the target and NCBP will be minimum for that target. So, keeping this in mind in this paper, we propose a mathematical model that estimates optimal number of guard channels (GCs) for HCs by considering target HCDP and keeping NCBP minimum. The mathematical model proposed assume static traffic parameters. However, in reality, the user traffic is dynamic and usually inherited through its testbed implementation. To obtain optimal performance we propose an adaptive GC reservation scheme by considering hard handoff constraint while implementing this model through testbed. Finally, we have verified testbed results with those of the model-based approach applying the parameters of different Global System for Mobile Communication (GSM) standards to evaluate its applicability to real systems.

Keywords: GSM; handoff call dropping; mobile cellular networks; new call blocking; optimal channel.

DOI: 10.1504/IJWMC.2025.144207

International Journal of Wireless and Mobile Computing, 2025 Vol.28 No.2, pp.170 - 185

Received: 10 Oct 2023
Accepted: 17 May 2024
Published online: 31 Jan 2025 *

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