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- Title
Traffic-aware resource allocation scheme for mMTC in dynamic TDD systems.
- Authors
Yinglei Teng; Wenyao Liang; Yong Zhang; Ruizhe Yang
- Abstract
The asymmetry traffic between downlink (DL) and uplink (UL) in massive machine-type communication (mMTC) systems is so prominent that it makes the traditionally fixed frame protocols insufficient to handle. Meanwhile, the dynamic timedivision duplexing (D-TDD) is a promising and attractive technology since its number of time slots for the DL and UL can be asymmetric and adjusted dynamically. In the cellular and mMTC co-existing network, to balance the discrepancy of the UL/DL ratio and alleviate the interference as well, in this study, the authors design a D-TDD-based transmission frame structure to first fulfil the basic transmission requirements of the human-type communication (HTC) users with a low power almost blank subframe. Herein, the stochastic geometry methods are adopted to calculate spectral efficiencies of the HTC user equipment. Then, focusing on the worst queue state in mMTC, they devise the slot allocation problem with the min-max objective of the UL/DL queues and utilise the sub-gradient descent (SGD) method for a solution. Simulation results show that the proposed traffic aware sub-frame configuration is more appropriate for the dynamical asymmetry environment. Meanwhile, the adopted dynamic step size SGD algorithm can achieve a trade-off between the worst-case queue and the network throughput.
- Subjects
SPECTRUM allocation; TIME division multiple access; MACHINE-to-machine communications; INTERFERENCE (Telecommunication); CELL phone systems; STOCHASTIC geometry
- Publication
IET Communications (Wiley-Blackwell), 2018, Vol 12, Issue 15, p1910
- ISSN
1751-8628
- Publication type
Article
- DOI
10.1049/iet-com.2018.5404