Mobility Load Balancing Scheme in LTE

[DANORM]

Abstract—Mobility Load Balancing (MLB) is one of the mostimportant functions of Self-Organizing Networks (SON) inLong Term Evolution (LTE). The conventional MLB schemesbased on handover (HO) conflict with Mobility RobustnessOptimization (MRO) because both operations adjust the sameHO parameters. The simulation results show that theconventional MLB scheme cannot achieve load balancing gainwithout some degradation in HO performance. In order tosolve the conflict problem, this paper proposes an MLB schemebased on cell reselection (CR) that works in coordination withMRO. The proposed scheme adjusts the CR parameters andnot the HO parameters, and never conflicts with MRO.Through computer simulations, it is shown that the proposedscheme can realize effective load balancing on a par withconventional schemes without any degradation in HOperformance. The simulation results show that the proposedscheme is especially effective in an environment where a lot ofsmall-size data packets are transmitted by a large number ofusers, which is highly applicable to current mobile networkswith explosive diffusion of smart phones. In such case, morethan 10% and 90% gains can be obtained in the totalthroughput and 5th percentile user throughput, respectively.
Keywords: LTE; self-organizing networks (SON); mobilityload balancing (MLB); mobility robustness optimization (MRO);cell reselection


And Please Add Reputation