Handover Management for VoWLAN Based on Estimation of AP Queue Length and Frame Retries

• NISWAR Muhammad

  Graduate School of Information Scinece, Nara Institute of Science and Technology

• KASHIHARA Shigeru

  Graduate School of Information Scinece, Nara Institute of Science and Technology

• TSUKAMOTO Kazuya

  Graduate School of Computer Science and Electronics, Department of Computer Science and Electronics, Kyushu Institute of Technology

• KADOBAYASHI Youki

  Graduate School of Information Scinece, Nara Institute of Science and Technology

• YAMAGUCHI Suguru

  Graduate School of Information Scinece, Nara Institute of Science and Technology

Abstract

Switching a communication path from one Access Point (AP) to another in inter-domain WLANs is a critical challenge for delay-sensitive applications such as Voice over IP (VoIP) because communication quality during handover (HO) is more likely to be deteriorated. To maintain VoIP quality during HO, we need to solve many problems. In particular, in bi-directional communication such as VoIP, an AP becomes a bottleneck with the increase of VoIP calls. As a result, packets queued in the AP buffer may experience a large queuing delay or packet losses due to increase in queue length or buffer overflow, thereby causing the degradation of VoIP quality for the Mobile Nodes (MNs) side. To avoid this degradation, MNs need to appropriately and autonomously execute HO in response to the change in wireless network condition, i.e., the deterioration of wireless link quality and the congestion state at the AP. In this paper, we propose an HO decision strategy considering frame retries, AP queue length, and transmission rate at an MN for maintaining VoIP quality during HO. Through simulation experiments, we then show that our proposed method can maintain VoIP quality during HO by properly detecting the wireless network condition.

Journal

• IEICE Transactions on Information and Systems

  IEICE Transactions on Information and Systems E92-D (10), 1847-1856, 2009

  The Institute of Electronics, Information and Communication Engineers

Keywords

• handover
• AP queue length
• frame retries
• transmission rate
• VoIP
• multi-rate WLAN

Details

• CRID: 1390282679356481792
• NII Article ID: 10026811254
• NII Article ID: 120005716650
• NII Book ID: AA10826272
• DOI: 10.1587/transinf.e92.d.1847
• ISSN: 17451361
• ISSN: 09168532
• HANDLE: 10061/6047
• Web Site: https://naist.repo.nii.ac.jp/records/3725
• Web Site: http://www.jstage.jst.go.jp/article/transinf/E92.D/10/E92.D_10_1847/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • IRDB
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed