Dynamic UL/DL mode selection and resource allocation in multi-cell MIMO TDD systems
Arvola, Antti; Joshi, Satya; Tölli, Antti (2020-03-30)
A. Arvola, S. Joshi and A. Tölli, "Dynamic UL/DL Mode Selection and Resource Allocation in Multi-Cell MIMO TDD Systems," 2019 53rd Asilomar Conference on Signals, Systems, and Computers, Pacific Grove, CA, USA, 2019, pp. 1936-1940, doi: 10.1109/IEEECONF44664.2019.9048674
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https://urn.fi/URN:NBN:fi-fe2020052639137
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Abstract
This paper considers joint uplink/downlink mode selection and resource allocation problem in multi-cell systems for flexible TDD frame structures. To combat the difficult interference characteristics of such systems, a dynamic mode selection and resource allocation scheme is derived using Lyapunov optimization. The result is a cross-layer optimization scheme, where a long-term time-average utility function of flow rates and interference penalty is optimized by solving a series of instantaneous subproblems. The proposed dynamic algorithm provides a solution for the UL/DL mode selection and resource allocation, guided by the accumulating network layer queues and virtual queues. Furthermore, a heuristic method is considered to decouple the difficult power constraint in the resource allocation subproblem.
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