Downlink and Uplink Cell Association in Sub-6GHz and Millimeter Wave 5G Heterogeneous Networks

Hisham Elshaer, Mandar N. Kulkarni, Federico Boccardi, Jeffrey G. Andrews, Mischa Dohler

Research output: Chapter in Book/Report/Conference proceedingConference paperpeer-review

7 Citations (Scopus)


Millimeter wave (mmWave) frequencies promise much higher capacities than conventional sub-6GHz networks thanks to the much wider bandwidth. However, mmWaves suffer from poor penetration and diffraction characteristics and are therefore expected to be deployed as an overlay to existing sub-6GHz networks. We develop a general analytical framework where we derive the biased uplink and downlink cell association as well as the SINR and rate coverage probabilities in such a hybrid system. Simulation results are presented to validate the analytical model. Using the analytical results, we show that decoupled uplink and downlink association plays a key role in this mixed deployment. We then show the effect of small cell biasing on the SINR and rate trends where very high biasing values are desirable to harness the gains from the wide bandwidths at mmWaves. In addition, robust modulation and coding schemes are needed to operate under very low SINR resulting from the aggressive bias values.

Original languageEnglish
Title of host publication2016 IEEE Globecom Workshops, GC Wkshps 2016 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages6
ISBN (Print)9781509024827
Publication statusPublished - 8 Feb 2017
Event2016 IEEE Globecom Workshops, GC Wkshps 2016 - Washington, United States
Duration: 4 Dec 20168 Dec 2016


Conference2016 IEEE Globecom Workshops, GC Wkshps 2016
Country/TerritoryUnited States


  • Cell association
  • Decoupling
  • Downlink
  • Millimeter-wave
  • Stochastic geometry
  • Sub-6GHz
  • Uplink


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