ICTACT Journal on Communication Technology

M. Deva Priya ¹, M. L. Valarmathi ², D. Prithviraj ¹

Affiliations
1 Department of Computer Science and Engineering, Sri Krishna College of Technology, IN
2 Department of Computer Science and Engineering, Government College of Technology, IN

Abstract

IEEE 802.16e has received wide attention as it supports high data rates and incredible pervasive connectivity with high Quality of Service (QoS) capabilities. To support QoS, many Bandwidth REQuest (BW-REQ) mechanisms are suggested in the literature for resource reservation in mobile WiMAX networks. There are chances for performance degradation with increase in the number of requests. QoS can be ensured if a contention resolution scheme is designed for sending BW-REQs to the Base Station (BS). To improve the efficiency of the random access mechanisms in the standard, a new mechanism called Dynamic Contention Resolution Scheme (DCRS) is proposed for IEEE 802.16e networks. DCRS groups the requests based on their service types and dynamically calculates the number of Contention slots based on the Arrival Rate (l) of requests.

Keywords

Broadband Wireless Access (BWA), IEEE 802.16e, Bandwidth Requests (BW-REQ), Contention Window, Quality of Service (QoS).

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M. Deva Priya ¹, M. L. Valarmathi ², K. Jaya Bharathi ¹, M. Deepa ¹

Affiliations
1 Department of Computer Science and Engineering, Sri Krishna College of Technology, IN
2 Department of Computer Science and Engineering, Government College of Technology, Coimbatore, IN

Abstract

The next generation wireless communication system aims at supporting multimedia services with different Quality of Services (QoS) and bandwidth requirements. Therefore effective management of limited resources is important to enhance network performance. Access Service Network Gateway (ASN GW) relocation is the process of changing the traffic's Anchor Point (AP) from one GW to another which is independent of Mobile Station's (MS's) Link Layer (LL) handover. The existing standards have details about the ASN relocation procedures, but do not specify when the ASN GW relocation has to be performed. As relocation is closely related to Admission Control, the proposed system combines gateway relocation and Admission Control to determine when to perform ASN GW relocation. This novel Bandwidth based Admission Control (BAC) Scheme considers the size of requests from each MS rather than taking the number of MSs as a whole. This mobility management scheme defined for WiMAX networks minimizes handover delay, packet loss, handover dropping probability, new call blocking probability and maximizes the throughput.

Keywords

Handover, Gateway Relocation, Admission Control (AC), Dropping Probability, Blocking Probability.

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