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Issue No. 04 - April (2016 vol. 15)
ISSN: 1536-1233
pp: 883-894
Diego Pacheco-Paramo , , Universitat Politècnica de València, Camino de Vera, s/n, Valencia, Spain
Ian F. Akyildiz , , Broadband and Wireless Networking Laboratory, School of Electrical and Computer Engineering, Atlanta, GA
Vicente Casares-Giner , , Universitat Politècnica de València, Camino de Vera, s/n, Valencia, Spain
ABSTRACT
Existing location management (LM) methods for macrocells in LTE-Advanced have tracking area list (TAL) granularity. Therefore, a user equipment (UE) triggers a location update (LU) whenever it leaves its current TAL, and it is searched through paging (PG) with TAL accuracy. However, these procedures are not well-suited for small cells (SCs). The reasons are twofold. First, dense deployments of SCs imply that paging has a low probability to be successful in the first attempt, increasing the signaling overhead in the core network (CN). Second, smaller coverage areas lead to a higher mobility among cells, increasing the signaling overhead in the CN due to LUs. In this work, two LM schemes with fine granularity are proposed. These schemes update UE's location to a local anchor (LA) in a SC or tracking area (TA) basis, respectively. By increasing the accuracy of UE's location, a significant reduction of signaling overhead in the CN due to PG is achieved. Moreover, LUs to the LA are performed through direct X2-interface links to avoid signaling overhead in the CN. A versatile mobility model is developed and closed-form expressions for UEs’ mobility metrics are found to validate the proposed schemes through variations of critical parameters such as TA/TAL configuration, UE's mobility patterns and cell residence times.
INDEX TERMS
Standards, Mobile computing, Macrocell networks, Measurement, Closed-form solutions, Data transfer, Registers
CITATION

D. Pacheco-Paramo, I. F. Akyildiz and V. Casares-Giner, "Local Anchor Based Location Management Schemes for Small Cells in HetNets," in IEEE Transactions on Mobile Computing, vol. 15, no. 4, pp. 883-894, 2016.
doi:10.1109/TMC.2015.2431717
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