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Vertical Handover Over Intermediate Switching Framework: Assuring Service Quality for Mobile Users

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Abstract

Ensuring quality of service (QoS) for the mobile users during vertical handover between IEEE 802.11 wireless local area networks (WLAN) and data network provided by Ultramodern Telecommunication Systems (UMTS) is one of the key requirements for seamless mobility and transfer of existing connections from one network to another. QoS fulfillment is a complex problem and requires participation of both the mobile users as well as the connection networks. The QoS assurance criteria for existing connections can be affected by fluctuations of data rates when a user moves from the high speed WLAN network to the low speed UMTS network, even in the presence of another WLAN network in its vicinity. This can happen if the alternate WLAN network is highly loaded. Therefore handover from a high speed network to a low speed network should be avoided, whenever possible. This paper proposes a QoS based handover procedure that prioritizes the existing connection over the new connections so that rate fluctuations due to handover can be avoided if there exist another WLAN network in the range of the mobile user. Whenever the possibility of handover is detected, a pre-handover bandwidth reservation technique is used to reserve bandwidth at the alternate WLAN networks to avoid QoS degradation. The proposed scheme is implemented in Qualnet network simulator and the performance is analyzed and compared with traditional handover techniques.

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Notes

  1. The interface queue size gives an measurement of the network congestion. If the interface queue size is large, it indicates that the network is congested.

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Authors and Affiliations

  1. Indian Institute of Technology, Guwahati, Assam, India

    Aditya Yadav, Maushumi Barooah, Sandip Chakraborty & Sukumar Nandi

Authors
  1. Aditya Yadav
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  2. Maushumi Barooah
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  3. Sandip Chakraborty
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  4. Sukumar Nandi
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Correspondence to Sandip Chakraborty.

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Yadav, A., Barooah, M., Chakraborty, S. et al. Vertical Handover Over Intermediate Switching Framework: Assuring Service Quality for Mobile Users. Wireless Pers Commun 77, 507–527 (2014). https://doi.org/10.1007/s11277-013-1518-9

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  • DOI: https://doi.org/10.1007/s11277-013-1518-9

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