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Combined closed loop/open loop power control in time division duplex communication

A communication system, time division duplex technology, applied in time division multiplexing systems, transmission control/equalization, power management, etc., can solve problems such as reducing overall system performance and system performance.

Inactive Publication Date: 2004-04-28
INTEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In some cases, the performance of these systems degrades
For example, if the communication sent between the UE 32 and the base station 30 is in a highly dynamic environment, such as due to the movement of the UE 32, the open-loop path loss estimation seriously degrades the overall performance of the system

Method used

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  • Combined closed loop/open loop power control in time division duplex communication
  • Combined closed loop/open loop power control in time division duplex communication
  • Combined closed loop/open loop power control in time division duplex communication

Examples

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Embodiment Construction

[0026] The preferred embodiment will now be described with reference to the drawings, wherein like reference numerals refer to like elements throughout. will use image 3 The flow chart of FIG. 4 and the components of two simplified communication stations 50, 52 as shown in FIG. 4 are used to explain combined closed-loop / open-loop power control. For the following discussion, a communication station whose transmitter power is controlled is referred to as transmitting station 52 and a communication station receiving power controlled communications is referred to as receiving station 50 . Because combined closed-loop / open-loop power control can be used for uplink, downlink, or both types of communications, the power-controlled transmitter may be located at base station 30 1 , UE 32 1 or both. Therefore, if both uplink and downlink power control are used, the components of the receiving and transmitting stations are both located at the base station 30 1 , in turn at UE 32 1 ....

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Abstract

Combined closed loop / open loop power control controls transmission power levels in a spread spectrum time division duplex communication station. A first communication station (50) receives communications from a second communication station (52). The first station transmits power commands based on in part a reception quality of the received communications. The first station transmits a first communication having a transmission power level in a first time slot. The second station receives the first communication and the power commands. A power level of the first communication as received is measured. A path loss estimate is determined based on in part the measured received second communication power level and the first communication transmission power level. The second station transmits a second communication to the first station in a second time slot. The second communication transmission power level is set based on in part the path loss estimate weighted by a factor and the power commands. The factor is a function of a time separation of the first and second time slots.

Description

technical field [0001] The present invention relates to spread spectrum time division duplex (TDD) communication systems. In particular, it relates to systems and methods for controlling transmit power in a TDD communication system. Background technique [0002] Figure 1 illustrates a wireless spread spectrum time division duplex (TDD) communication system. The system has multiple base stations 30 1 ~30 7 . 30 per base station 1 with User Equipment (UE) 32 in its area of ​​operation 1 ~32 3 to communicate. from base station 30 1 To UE 32 1 The communication sent is called downlink communication, while from UE 32 1 to the base station 30 1 The sent communications are referred to as uplink communications. [0003] In addition to communicating on different spectrums, spread spectrum TDD systems also conduct multiple communications on the same spectrum. Multiple signals are distinguished by their respective chip code sequences (codes). Moreover, in order to utilize...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/04H04B7/005H04B7/216H04B7/26H04J3/00H04W52/06H04W52/08H04W52/10H04W52/12H04W52/18H04W52/20H04W52/22H04W52/24H04W52/50H04W52/54
CPCH04W52/12H04W52/243H04W52/242H04W52/225H04W52/08H04W52/246H04W52/50H04W52/54H04W52/20H04W52/18H04W52/06H04W52/228H04W52/10
Inventor 阿里埃拉·蔡拉费思M·奥兹鲁特克辛承赫
Owner INTEL CORP