Joint data assignment and beamforming for backhaul limited caching networks

Xi Peng, Juei Chin Shen, Jun Zhang, Khaled Letaief

Research output: Chapter in Book/Report/Conference proceedingConference contribution

43 Citations (Scopus)

Abstract

Caching at wireless access points is a promising approach to alleviate the backhaul burden in wireless networks. In this paper, we consider a cooperative wireless caching network where all the base stations (BSs) are connected to a central controller via backhaul links. In such a network, users can get the required data locally if they are cached at the BSs. Otherwise, the user data need to be assigned from the central controller to BSs via backhaul. In order to reduce the network cost, i.e., the back-haul cost and the transmit power cost, the data assignment for different BSs and the coordinated beamforming to serve different users need to be jointly designed. We formulate such a design problem as the minimization of the network cost, subject to the quality of service (QoS) constraint of each user and the transmit power constraint of each BS. This problem involves mixed-integer programming and is highly complicated. In order to provide an efficient solution, the connection between the data assignment and the sparsity-introducing norm is established. Low-complexity algorithms are then proposed to solve the joint optimization problem, which essentially decouple the data assignment and the transmit power minimization beamforming. Simulation results show that the proposed algorithms can effectively minimize the network cost and provide near optimal performance.

Original languageEnglish
Title of host publication2014 IEEE 25th Annual International Symposium on Personal, Indoor, and Mobile Radio Communication, IEEE PIMRC 2014
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1370-1374
Number of pages5
Volume2015-June
ISBN (Electronic)9781479949120
DOIs
Publication statusPublished - 25 Jun 2015
Externally publishedYes
Event2014 25th IEEE Annual International Symposium on Personal, Indoor, and Mobile Radio Communication, IEEE PIMRC 2014 - Washington, United States
Duration: 2 Sep 20145 Sep 2014

Other

Other2014 25th IEEE Annual International Symposium on Personal, Indoor, and Mobile Radio Communication, IEEE PIMRC 2014
CountryUnited States
CityWashington
Period2/9/145/9/14

    Fingerprint

Keywords

  • backhaul cost
  • Caching networks
  • data assignment
  • power cost
  • sparsity-introducing norm

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Peng, X., Shen, J. C., Zhang, J., & Letaief, K. (2015). Joint data assignment and beamforming for backhaul limited caching networks. In 2014 IEEE 25th Annual International Symposium on Personal, Indoor, and Mobile Radio Communication, IEEE PIMRC 2014 (Vol. 2015-June, pp. 1370-1374). [7136382] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/PIMRC.2014.7136382