Graduate School and Research Center in Digital Sciences

Joint optimization of user association and dynamic TDD for ultra-dense networks

Sapountzis, Nikolaos; Spyropoulos, Thrasyvoulos; Nikaein, Navid; Salim, Umer

INFOCOM 2018, IEEE International Conference on Computer Communications, 15-19 April 2018, Honolulu, HI, USA

Best-in-Session Presentation Award

Ultra-dense small cell networks will require sophisticated user association algorithms that consider (i) channel characteristics, (ii) base station load, and (iii) uplink/downlink (UL/DL) traffic profiles. They will also be characterized by high spatio-temporal variability in UL/DL traffic demand, due to the fewer users per BS. In this direction, Dynamic TDD is a promising new technique to match BS resources to actual demand. While plenty of literature exists on the problem of user association, and some recent on dynamic TDD, most works consider these separately. In this paper, we argue that user association policies are strongly coupled with the allocation of resources between UL and DL. We propose an algorithm that decomposes the problem into separate subproblems that can each be solved efficiently and in a distributed manner, and prove convergence to the global optimum. Simulation results suggest that our approach can improve UL and DL performance at the same time, with an aggregate improvement of more than 2, compared to user association under static TDD allocation.

Document Doi Bibtex

Title:Joint optimization of user association and dynamic TDD for ultra-dense networks
Department:Communication systems
Eurecom ref:5421
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Bibtex: @inproceedings{EURECOM+5421, doi = {}, year = {2018}, title = {{J}oint optimization of user association and dynamic {TDD} for ultra-dense networks}, author = {{S}apountzis, {N}ikolaos and {S}pyropoulos, {T}hrasyvoulos and {N}ikaein, {N}avid and {S}alim, {U}mer}, booktitle = {{INFOCOM} 2018, {IEEE} {I}nternational {C}onference on {C}omputer {C}ommunications, 15-19 {A}pril 2018, {H}onolulu, {HI}, {USA}}, address = {{H}onolulu, {UNITED} {STATES}}, month = {04}, url = {} }
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