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Improved path loss measurements in wireless communications

A path loss, wireless communication system technology, applied in the field of path loss measurement, can solve problems such as loss of signal power

Inactive Publication Date: 2006-01-25
INTERDIGITAL TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, if a WTRU is moving at a moderate speed such as 60 km / h, tens of microseconds of important signal power may be lost

Method used

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  • Improved path loss measurements in wireless communications
  • Improved path loss measurements in wireless communications
  • Improved path loss measurements in wireless communications

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Embodiment Construction

[0014] The present invention will be described below with reference to the drawings, wherein like codes refer to like components throughout.

[0015] The invention described hereafter is applicable to time slotted systems in general, and in particular to TDD and TD-SCDMA systems. However, those skilled in the art should understand that the present invention is not limited to these systems.

[0016] The present invention provides an improved channel estimation method using a plurality of DL channels for which path loss (PL) can be measured such that between: a) receiving and measuring DL reference signals at the WTRU, and calculating UL power setpoint; and b) minimizing the duration between UL time slots in which the calculated power setpoint is applied. The path loss measure can be determined by measuring the power of a received DL signal, obtaining the transmit power of the received signal, and calculating the difference between the transmit power and the receive power.

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Abstract

A method for determining uplink power requirements for a transceiver in a wireless communications system includes obtaining measurements from a beacon signal occupying a first timeslot in a frame; obtaining measurements from at least one additional channel having a known transmitted signal strength and occupying a second timeslot in the frame; and utilizing the measurements to determine a path loss estimate.

Description

technical field [0001] The present invention relates generally to path loss measurement in wireless communications. More particularly, the present invention relates to a method and apparatus for implementing open loop power control using multiple channels to achieve path loss measurements. Background technique [0002] When determining the uplink (UL) power requirements of a transceiver, since there is usually a proportional relationship between the received signal and the power required for transmission, it is possible to examine the received downlink (DL) signal and extract the At least some information required by power. If the transmission power of a signal received by the transceiver is known, or if there is some way of estimating the transmission power, the necessary transmission power to reflect the transmission can be estimated. [0003] However, these estimates are not accurate for certain types of communication systems such as time slotted communication systems. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/212H04B1/707H04B7/005H04B17/00
CPCH04W52/243H04W52/146H04W52/242H04W52/54H04W52/228H04B17/0045H04W52/10H04B17/327H04B7/2609H04B7/2671H04B17/336
Inventor 颂佑·辛马里恩·鲁道夫史蒂芬·G·迪克
Owner INTERDIGITAL TECH CORP
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