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Investigation on group based contention bandwidth request in LTE-A networks under high delay spread environment

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Abstract

In this paper, contention bandwidth request has been investigated for long term evolution-advanced (LTE-A) networks under extended typical urban based multipath fading channel that displays high delay spread environment. As the choice of preambles has to provide high detection probability under such environments, at the outset, this paper examines various group based preamble selection mechanisms, namely, Type I, Type II and Type III preamble sets. With suitable type of group based preamble, the challenge during contention bandwidth request is the appropriate choice of contention window during contention resolution. The contention window in this paper is chosen based on the indicators of various failure events, namely, probability of collision due to contention, probability of unavailability of bandwidth, probability of channel error and probability of improper detection of Zadoff–Chu sequences. After suggesting a scheme to account the possible failure events, an analytical model for contention-based bandwidth request has been developed for LTE-A networks. In addition, two backoff mechanisms are proposed to resolve contention among user equipment’s effectively and these mechanisms are compared to the existing techniques, namely, binary exponential backoff and uniform backoff. Further, the contention mechanism has been substantiated for varying depth of channel errors. With Type I grouping, the backoff with optimized contention window improves the efficiency by 13.95 %, reduces the access delay by 18.71 % and decreases the dropping probability by 59.33 % than the existing uniform backoff mechanism.

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Authors and Affiliations

  1. School of Electronics Engineering, VIT University, Vellore, India

    A. Rajesh

  2. Department of Electronics Engineering, School of Engineering and Technology, Pondicherry University, Puducherry, India

    R. Nakkeeran

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  1. A. Rajesh
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  2. R. Nakkeeran
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Correspondence to A. Rajesh.

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Rajesh, A., Nakkeeran, R. Investigation on group based contention bandwidth request in LTE-A networks under high delay spread environment. Wireless Netw 22, 1931–1945 (2016). https://doi.org/10.1007/s11276-015-1079-9

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