Programmable Device Circuits and Systems

Debabrata Sarddar ¹, Shubhajeet Chatterjee ², Sougata Chakraborty ³, Jayanta Kumar Bagchi ⁴, Kunal Hui ⁵, Kalyan Kumar Das ⁶, Milton Samadder ⁷, Pulak Mazumder ⁸

Affiliations
1 Department of Electronics and Telecommunication Engineering, Jadavpur University, Kolkata – 700032, IN
2 Department of Electronics and Communication Engineering, Institute of Engineering & Management College, Saltlake, Kolkata-700091, IN
3 IBM (Pune), IN
4 Department of Electronics and Communication Department in Bankura Unnayani Institute of Engineering College, IN
5 L&T (Mumbai), IN
6 Cognizant, IN
7 Department of IT in Bankura Unnayani Institute of Engineering College, IN
8 Department of Electronics and Telecommunication Engineering, Regent Education & Research Foundation, Barracpore, IN

Abstract

In satellite communication network, low earth orbit (LEO) satellite has become more popular than geostationary earth orbit satellite (GEO) due to their low propagation delay and low power requirements. During the course of movement of the LEO satellite, the area covered by its spot-beam (the footprint region of a satellite is divided into a number of clusters of cells which is known as spot-beam) is changing very rapidly. Thus the handover of connections from one spot-beam to other spot-beam is required. But their high relative speed and random direction of motion provide a serious barrier for such services to be made available to wireless communication. Throughout the last few years a plenty of researches had been done in this field of satellite handover management, but the problem remains unsolved. In this paper we are going to propose a new adaptive channel allocation scheme for efficient utilization of resources (channels) in handover and new channel allocation in LEO Satellite communication. We have divided the total footprint region in three sections according to the traffic load of different spot-beams (i.e. Urban Areas, Suburban Areas and Rural Areas) and for each section we have assigned different channel allocation techniques according to their traffic loads. This approach reduces the unnecessary complexity and unnecessary reservation of resources (channels) which in turn reduces the complexity of the communication network.

Keywords

Footprint, LEO, Channel Allocation, Spot-Beam, BS (Base Station).

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Debabrata Sarddar ¹, Shubhajeet Chatterjee ², Arnab Raha ¹, Mustque Ahmed ¹, Pulak Mazumder ³, Utpal Biswas ¹, M. K. Naskar ¹

Affiliations
1 Department of Electronics and Telecommunication Engineering, Jadavpur University, Kolkata – 700032, IN
2 Department of Electronics and Communication Engineering, Institute of Engg. & Managment College, Saltlake, Kolkata-700091, IN
3 Department of Electronics and Telecommunication Engg, Regent Education & Research Foundation, Barracpore, IN

Abstract

Presently, IEEE 802.11 based wireless local area networks (WLAN) have been widely deployed for business and personal applications. The main issue regarding wireless network technology is handoff or hand over management, especially in urban areas, due to the limited coverage of access points (APs) or base stations (BS). When a mobile station (MS) moves outside the range of its current access point (AP) it needs to perform a link layer handover. But handoff failure probability provides a serious barrier for such services to be made available to mobile platforms. Throughout the last few years plenty of research works had been done to reduce the hand off failure probability. Whereas, some of them have applied efficient channel allocation techniques, keeping the total number of channels constant. In this paper we also propose a method to minimize the handoff failure probability by increasing the total number of channel with help of Mother cell Child cell concept. Here we consider a larger hexagonal cell which almost covers up the whole region of a seven cell cluster. We will say this larger cell as the Mother cell and the smaller cells are the Child cells. The mother cell AP has a higher signal range than that of child cell as it covers larger area than the child cell. The Mother cell AP will only perform the handoff job whereas the child cell AP will perform both the originating and the handoff calls. Thus the total number of channel increases without any channel interference. This in turn, reduces the handoff failure probability. Simulation results yield that the proposed mechanism outperforms the usual channel allocation technique.

Keywords

IEEE 802.11, Handoff Failure, GPS (Global Positioning System), Channel Allocation, Neighbor APs.

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