TITLE:
Energy-Saving Technology in Indoor LTE System with DTX Based on CQI
AUTHORS:
Zhenyu Yang, Yong Shang, Dingyang Chen, Xiguang Zhang
KEYWORDS:
LTE System, CQI, Adaptive Modulation and Coding, Indoor Channel, Energy-Saving
JOURNAL NAME:
International Journal of Communications, Network and System Sciences,
Vol.8 No.4,
April
2,
2015
ABSTRACT:
In LTE (Long Term Evolution) system, CQI (Channel
Quality Indication) is a technical method to realize adaptive modulation and
coding. The dispatcher of BS (base station) would allocate resource blocks to
users dynamically based on CQI of uplink and downlink channels, which is necessary
in the process of uplink and downlink transmission [1]. When the CQI level of
the channel is high, the energy efficiency is high. On the contrary, when the
CQI level of the channel is low, the energy efficiency is low. However, if
signals are not transmitted until the quality of the channel is good, energy
loss may be lowered in the expense of group delay. That is to say, we take CQI
into account on the basis of the technology of DTX [2] [3] (Discontinuous
Transmission). According to the result of simulation, the energy consumption can
be reduced by using our proposed scheme. Particularly, the energy-saving effect
is significant when the load is low.