HetNets with Random DTX Scheme: Local Delay and Energy Efficiency

Heterogeneous cellular networks (HetNets) are to be deployed for future wireless communications to meet the ever-increasing mobile traffic demand. However, the dense and random deployment of small cells and their uncoordinated operation raise important concerns about energy efficiency. On the other hand, discontinuous transmission (DTX) mode at the base station (BS) serves as an effective technology to improve energy efficiency of the overall system. In this paper, the authors investigate energy efficiency under a finite local delay constraint in the downlink HetNets with the random DTX scheme. Using a stochastic-geometry-based model, the authors derive the local delay and energy efficiency in a general case and obtain closed-form expressions in some special cases. These results give insights into the effect of key system parameters, such as path-loss exponents, BS densities, signal-to-interference-ratio (SIR) threshold, and mute probability on system performance. The authors also provide the low-rate and high-rate asymptotic behavior of the maximum energy efficiency. It is analytically shown that it is less energy efficient to apply the random DTX scheme in the low-rate regime. In the high-rate regime, however, a random DTX scheme is essential to achieve the finite local delay and higher energy efficiency. Finally, the authors extend the analysis to the load-aware DTX scheme, where the mute probability depends on the user activity level.

• Record URL:
  https://doi.org/10.1109/TVT.2015.2477374
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00189545
• Supplemental Notes:
  • Copyright © 2016, IEEE.
• Authors:
  • Nie, Weili
  • Zhong, Yi
  • Zheng, Fu-Chun
  • Zhang, Wenyi
  • O'Farrell, Timothy
• Publication Date: 2016-8

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: pp 6601-6613
• Serial:
  • IEEE Transactions on Vehicular Technology
  • Volume: 65
  • Issue Number: 8
  • Publisher: Institute of Electrical and Electronics Engineers (IEEE)
  • ISSN: 0018-9545
  • Serial URL: http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=25

Subject/Index Terms

• TRT Terms: Delays; Energy consumption; Mobile communication systems; Transmission errors and interference; Transmission techniques; Wireless communication systems
• Subject Areas: Data and Information Technology; Highways;

Filing Info

• Accession Number: 01611706
• Record Type: Publication
• Files: TRIS
• Created Date: Sep 23 2016 11:19AM