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Control method of uplink power of long term evolution (LTE) system

A control method and closed-loop power control technology, applied in power management, energy-saving ICT, electrical components, etc., to achieve the effect of meeting transmission requirements

Inactive Publication Date: 2011-03-16
ZHEJIANG COMM SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is that the overhead of signaling is required during the adjustment process, and there is also a problem of delay in closed-loop control, because it takes time to exchange information between base stations or between users and base stations

Method used

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  • Control method of uplink power of long term evolution (LTE) system
  • Control method of uplink power of long term evolution (LTE) system
  • Control method of uplink power of long term evolution (LTE) system

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Embodiment Construction

[0022] Such as figure 1 Shown are two adjacent cells of the LTE system. Base station eNB1 and base station eNB2 are respectively installed in the two cells. The area where the circle is located is the area covered by the base station of the cell. The black dots in the circle indicate where terminal A and terminal B are located. Location. In this system, both terminal A and terminal B are in the cell covered by base station eNB1, and the cell covered by base station eNB2 is the nearest neighbor cell to terminal A and terminal B, that is, base station eNB2 is interfered by the uplink transmission of terminal A and terminal B For the largest base station, the base station interference of other cells is often lower than the threshold set by the base station. Since terminal B is relatively close to the center of the cell, its interference to the cell covered by base station eNB2 is small. Terminal A's position has the greatest interference to the cell covered by base station eNB2,...

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Abstract

The invention discloses a control method of uplink power of a long term evolution (LTE) system, comprising open loop power control and closed loop power control. The open loop power control comprises the following steps: three interference thresholds IOT1, IOT2 and IOT3 are preset in a base station, and the interference signal sent by a terminal is periodically detected, wherein IOT1<IOT2<IOT3; when the strength X of the interference signal is larger than IOT1, the base station sends a feedback signal to reduce the uplink power of the terminal, the reduction range is delta TdB, wherein the delta T is an amount associated with the real-time uplink power of the terminal and the distance among the cell base stations. When the method disclosed by the invention is used for controlling the closed loop power, the reduction amplitude of the uplink power is determined by the path difference values from the terminal to the current cell and the disturbed cell as well as a threshold value exceeded by the uplink power, and when the uplink power intensively interferes the adjacent cell, the uplink power can be regulated by using the control method to a proper value in a short time to meet the transmission requirement.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method for controlling uplink power of an LTE system. Background technique [0002] In the current 3GPP LTE system, the technology based on Orthogonal Frequency Division Multiple Access (OFDM, Orthogonal Frequency Division Multiplexing) is obviously different from the CDMA technology used in 3G, and its performance has been greatly improved. More stringent requirements, such as 3GPP proposed to improve the communication rate and spectrum utilization efficiency, under the premise of a system bandwidth of 20MHz, the downlink peak rate is 100Mbps, and the uplink peak rate is 50Mbps. Another important requirement is to improve cell edge user performance. In order to achieve the above-mentioned required conditions, it is necessary to make the frequency reuse factor equal to 1 as much as possible when deploying the network. That is to say, adjacent cells use ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/08H04W52/10H04W52/14
CPCY02B60/50
Inventor 孙光照曾国勇王一雷赵焕东董树荣周庆涛
Owner ZHEJIANG COMM SERVICES
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