Traffic‐aware resource allocation scheme for mMTC in dynamic TDD systems
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 time‐division 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.
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Information
Published In
© 2021 The Institution of Engineering and Technology.
Publisher
John Wiley & Sons, Inc.
United States
Publication History
Published: 22 August 2018
Author Tags
Author Tags
- traffic‐aware resource allocation scheme
- mMTC
- dynamic TDD systems
- asymmetry traffic
- uplink
- massive machine‐type communication systems
- traditionally fixed frame protocols
- dynamic time‐division duplexing
- promising technology
- attractive technology
- time slots
- UL/DL ratio
- authors design
- D‐TDD‐based transmission frame structure
- basic transmission requirements
- human‐type communication users
- low power almost blank subframe
- stochastic geometry methods
- HTC user equipment
- worst queue state
- slot allocation problem
- UL/DL queues
- sub‐gradient descent method
- traffic aware sub‐frame configuration
- dynamical asymmetry environment
- adopted dynamic step size
- worst‐case queue
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- Research-article
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