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A multi-criteria handoff decision mechanism for IEEE 802.11
2004 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The standard handoff decision algorithm in use today in 802.11 networks is a fairly simple, single-criterion algorithm (SDA) based on Received Signal Strength (RSS). In most cases this algorithm works well and can ensure that mobile users stay connected. There are however situations where its behavior is less than ideal: where handoff is performed much too often and where connection loss can occur. This thesis describes how a multi-criteria handoff decision algorithm (MDA) can be employed to overcome the limitations of the standard SDA. The MDA adds robustness by considering multiple handoff decision metrics. Besides RSS, handoff decisions are also influenced by the time-derivate of RSS and packet jitter retrieved from a real-time media stream. An evaluation of the MDA is made based on experiments performed in a real- world environment using SIMOS Toolkit: a multi-purpose, WLAN mobility toolkit implemented as part of the thesis. The MDA is compared against a conventional RSS based SDA. In the tested situations the MDA performs better than its single-criterion counterpart. It maximizes the utilization of AP range and reduces handoff delay, which leads to fewer handoffs and limits the risk of connection loss due to the corner effect.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Handoff, Handoff decision algorithm, Handoff decision, mechanism, WLAN, 802.11
Keyword [sv]
URN: urn:nbn:se:ltu:diva-50588ISRN: LTU-EX--04/174--SELocal ID: 7d2e3e1d-2086-4129-a49d-4003006c207aOAI: diva2:1023949
Subject / course
Student thesis, at least 30 credits
Educational program
Computer Science and Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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