A Novel Power-Saving Transmission Scheme for Multiple-Component-Carrier Cellular Systems

Discontinuous reception (DRX), wherein a user equipment (UE) temporarily disables its receiver, is a critical power saving feature in modern cellular systems. DRX is likely to be aggressively used at mmWave and sub-THz frequencies due to the high front-end power consumption. A key challenge for DRX at these frequencies is blockage-induced link outages: A UE will likely need to track many directional links to ensure reliable multi-connectivity, thereby increasing the power consumption. In this paper, we explore reinforcement learning-based link tracking policies in connected mode DRX that reduce power consumption by tracking only a fraction of the available links, but without adversely affecting the outage and throughput performance. Through detailed, system level simulations at 28 GHz (5G) and 140 GHz (6G), we observe that even sub-optimal link tracking policies can achieve considerable power savings with relatively little degradation in outage and throughput performance, especially with digital beamforming at the UE. In particular, we show that it is feasible to reduce power consumption by 75% and still achieve up to 95% (80%) of the maximum throughput using digital beamforming at 28 GHz (140 GHz), subject to an outage probability of at most 1%.

Download Full-text

A fairness-control-based power-saving transmission scheme in OFDMA-based multi-carrier data networks

2012 12th International Conference on ITS Telecommunications ◽

10.1109/itst.2012.6425175 ◽

2012 ◽

Cited By ~ 1

Author(s):

Yao-Liang Chung ◽

Zsehong Tsai

Keyword(s):

Power Saving ◽

Data Networks ◽

Transmission Scheme

Download Full-text

UFMC-Based Underwater Voice Transmission Scheme with LDPC Codes

Applied Sciences ◽

10.3390/app11041818 ◽

2021 ◽

Vol 11 (4) ◽

pp. 1818

Author(s):

Chin-Feng Lin

Keyword(s):

Channel Estimation ◽

Channel Coding ◽

Additive White Gaussian Noise ◽

Adaptive Modulation ◽

Power Saving ◽

Channel Fading ◽

Transmission Scheme ◽

Estimation Errors ◽

Channel Estimation Errors ◽

Voice Transmission

An underwater universal filtered multicarrier (UFMC)-based voice transmission scheme is proposed using a 512-point inverse discrete Fourier transform, utilizing 10 sub-bands, and that each had 20 subcarriers. In this proposed UFMC method, the adaptive modulation technologies with 4 quadrature amplitude modulation (QAM), 16-QAM, and low-density parity-check (LDPC) channel coding were integrated. Additionally, the bit error rate (BER), transmission power weighting, the ratios of power-saving, and underwater voice transmission performance with perfect channel estimation (PCE), and 5% and 10% channel estimation errors (CEEs) were investigated. The underwater voice transmission had a BER quality of service 10−3. Simulation results showed that the PCE outperformed 5% and 10% CEEs, under 4-QAM, with gains of 0.5 and 0.9 dB, respectively, and a BER of 4×10−4. The PCE outperformed 5% and 10% CEEs, under 16-QAM, with gains of 0.5 and 2.4 dB, respectively, and a BER of 8.5×10−4. The proposed UFMC scheme can be applied to underwater voice transmission with a BER below 10−3 The proposed system showed a superior capability to contend with additive white Gaussian noise, underwater multipath channel fading, and CEEs.

Download Full-text