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Time on-off method based on CQI in indoor LTE system

A time and base station technology, applied in the field of new green energy-saving solutions, can solve problems such as energy waste, low energy efficiency, and reduced energy utilization

Inactive Publication Date: 2013-12-11
PEKING UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The adaptation of adaptive modulation and coding corresponds to the transmission mode of the channel condition, that is, when the channel information is better, the system can complete communication with higher throughput, so a higher CQI index will be used; and when the channel condition is worse , in order to meet the requirements of BER, it is necessary to choose a modulation and coding method with low energy efficiency, which greatly reduces the utilization rate of energy and causes a certain degree of waste of energy

Method used

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  • Time on-off method based on CQI in indoor LTE system
  • Time on-off method based on CQI in indoor LTE system
  • Time on-off method based on CQI in indoor LTE system

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Embodiment Construction

[0036] In order to verify the application effect of the CQI-based time-on-off technology indoors, the maximum data capacity of the system is defined as:

[0037] R m ( bps / Hz ) = t f log 2 ( 1 + P m g N 0 B )

[0038] Therefore, the data capacity of each subcarrier is R m / 10, unable to achieve R d ≥R m Case. Under single-user conditions, the cell radius is d=15m and the data rate R is under full load (LF=100%) d =E(R m )=5.8bps / Hz for system simulation, figure 1 Changes in RF power consumption for selecting different numbers of acti...

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Abstract

The invention relates to a time on-off method based on CQI in an indoor LTE system. According to a time on-off technology based on CQI in the indoor LTE system, data are not transmitted at a subframe low in CQI value and are transmitted until the subframe is high in CQI value, and therefore energy consumption can be reduced at the cost of group delay. The time on-off method based on CQI in the indoor LTE system can achieve the effect that a data package is transmitted in a high speed transmission mode when channel conditions are excellent, thereby improving the efficiency of data sending of a system; when the channel conditions are poor, the data package is stopped from being sent and continues to be sent after the channel conditions are improved; or, the data package is still sent when a CQI feedback value is relatively low and is above a certain time threshold value so as to ensure the continuity of communication.

Description

technical field [0001] The present invention proposes a novel green energy-saving scheme for an indoor LTE (Long Term Evolution) system, and specifically relates to a CQI-based time-on-off (DTX) method. Background technique [0002] CQI (Channel Quality Indication) is a channel quality indication, and the definition and meaning of the CQI is a specific technical means for realizing adaptive coding in the LTE system. In the LTE system, the cell base station can select an appropriate modulation and coding scheme according to the CQI indication fed back by the mobile terminal, thereby improving system throughput and transmission rate. At the same time, the scheduler of the base station can also dynamically select a suitable resource block for the user to perform uplink and downlink transmission according to the CQI indication of the uplink and downlink channels, so as to realize the resource scheduling of the LTE system. The CQI indicates the highest modulation and coding sche...

Claims

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Application Information

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IPC IPC(8): H04W52/02H04W28/04
CPCY02D30/70
Inventor 尚勇谢梦非陈丁洋
Owner PEKING UNIV
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