Energy efficient inter-frequency small cell discovery in heterogeneous networks

Onireti, O. , Imran, A., Imran, M. A. and Tafazolli, R. (2015) Energy efficient inter-frequency small cell discovery in heterogeneous networks. IEEE Transactions on Vehicular Technology, 65(9), pp. 7122-7135. (doi: 10.1109/TVT.2015.2482818)

Abstract

In this paper, using stochastic geometry, we investigate the average energy efficiency (AEE) of the user terminal (UT) in the uplink of a two-tier heterogeneous network, where the two tiers are operated on separate carrier frequencies. In such a deployment, a typical UT must periodically perform the interfrequency small-cell discovery (ISCD) process to discover small cells in its neighborhood and benefit from the high data rate and traffic offloading opportunity that small cells present. We assume that the base stations of each tier and UTs are randomly located, and we derive the average ergodic rate and UT power consumption, which are later used for our AEE evaluation. The AEE incorporates the percentage of time that a typical UT missed small-cell offloading opportunity as a result of the periodicity of the ISCD process. The additional power consumed by the UT due to the ISCD measurement is also included. Moreover, we derive the optimal ISCD periodicity based on the UT's average energy consumption (AEC) and AEE. Our results reveal that ISCD periodicity must be selected with the objective of either minimizing the UT's AEC or maximizing the UT's AEE.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Imran, Professor Muhammad and Onireti, Oluwakayode
• Authors: Onireti, O., Imran, A., Imran, M. A., and Tafazolli, R.
• College/School: College of Science and Engineering > School of Engineering; College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: IEEE Transactions on Vehicular Technology
• Publisher: IEEE
• ISSN: 0018-9545
• Copyright Holders: Copyright © 2015 IEEE
• First Published: First published in IEEE Transactions on Vehicular Technology 65(9): 7122-7135
• Publisher Policy: Reproduced in accordance with the publisher copyright policy