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Mobility Load Balancing Scheme based on Cell Reselection

Authors:
Toshiaki Yamamoto
Toshihiko Komine
Satoshi Konishi

Keywords: LTE; self-organizing networks (SON); mobility load balancing (MLB); mobility robustness optimization (MRO); cell reselection

Abstract:
Mobility Load Balancing (MLB) is one of the most important functions of Self-Organizing Networks (SON) in Long Term Evolution (LTE). The conventional MLB schemes based on handover (HO) conflict with Mobility Robustness Optimization (MRO) because both operations adjust the same HO parameters. The simulation results show that the conventional MLB scheme cannot achieve load balancing gain without some degradation in HO performance. In order to solve the conflict problem, this paper proposes an MLB scheme based on cell reselection (CR) that works in coordination with MRO. The proposed scheme adjusts the CR parameters and not the HO parameters, and never conflicts with MRO. Through computer simulations, it is shown that the proposed scheme can realize effective load balancing on a par with conventional schemes without any degradation in HO performance. The simulation results show that the proposed scheme is especially effective in an environment where a lot of small-size data packets are transmitted by a large number of users, which is highly applicable to current mobile networks with explosive diffusion of smart phones. In such case, more than 10% and 90% gains can be obtained in the total throughput and 5th percentile user throughput, respectively.

Pages: 381 to 387

Copyright: Copyright (c) IARIA, 2012

Publication date: June 24, 2012

Published in: conference

ISSN: 2308-4219

ISBN: 978-1-61208-203-5

Location: Venice, Italy

Dates: from June 24, 2012 to June 29, 2012