Interference management and backhaul design in wireless networks via a DoF analysis

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

Abstract

This paper summarizes recent results on interference management and backhaul design in wireless networks via a degrees of freedom (DoF) analysis. A K-user interference network with coordinated multipoint (CoMP) transmission is considered first, under backhaul load constraints that limit the cooperation between the basestation transmitters. The per user DoF is characterized for locally connected linear interference networks and then extended to the more practical hexagonal sectored cellular networks. For the studied network models, by allowing for CoMP transmission and a flexible message assignment that is constrained by an average backhaul load, one can deliver the rate gains promised by information-theoretic upper bounds with practical one-shot zero-forcing schemes that incur little or no additional load on the backhaul. The DoF gains are then characterized for the downlink of a two-layered heterogeneous hexagonal cellular network with macro base stations (MB), small cell base stations (SB) that act as half duplex analog relays, and mobile terminals (MT). The first layer is a point-to-multipoint wireless backhaul between macro base stations and small cell base stations, and the second layer is the transmission layer between SBs and MTs. The two layers are assumed to use the same time/frequency resources for communication, thus limiting the maximum achievable per user DoF in the system to half, due to the half-duplex nature of the SBs. The proposed schemes are simple zero forcing schemes that employ joint processing and achieve cooperation similar to the single-layer K-user network but without overloading the wireless backhaul. This is achieved by sending an appropriate linear combination of users' messages from the MBs to the SBs that zero force the interference at the MTs. The achievable schemes exploit the half-duplexity of the SBs in the system and schedule the SBs and MTs to be active in different time-slots to reduce the interference. In particular, it is shown that the optimal per user DoF of half can be approached in a hexagonal sectored cellular network using only zero forcing schemes.

Original languageEnglish (US)
Title of host publication2018 10th International Conference on Communication Systems and Networks, COMSNETS 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages220-227
Number of pages8
ISBN (Electronic)9781538611821
DOIs
StatePublished - Mar 29 2018
Event10th International Conference on Communication Systems and Networks, COMSNETS 2018 - Bangalore, India
Duration: Jan 3 2018Jan 7 2018

Publication series

Name2018 10th International Conference on Communication Systems and Networks, COMSNETS 2018
Volume2018-January

Other

Other10th International Conference on Communication Systems and Networks, COMSNETS 2018
Country/TerritoryIndia
CityBangalore
Period1/3/181/7/18

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Hardware and Architecture
  • Control and Optimization

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