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Method and arrangements for noise rise estimation

A technology of noise and equipment, applied in the field of load estimation in cellular communication systems, can solve the problems of sudden increase, increased power, underestimation of noise rise metric, etc., and achieves the effect of low complexity and improved accuracy

Inactive Publication Date: 2010-08-11
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At higher loads, however, the result is that the total power measurement or estimate will be less likely to be near the true noise floor and the minimum becomes a slightly poorer estimate
Consequently, noise rise metrics determined based on such noise floor estimates will generally be underestimated, which in turn increases the risk of e.g. power surges

Method used

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  • Method and arrangements for noise rise estimation
  • Method and arrangements for noise rise estimation
  • Method and arrangements for noise rise estimation

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Embodiment Construction

[0032] Throughout this disclosure, boldface in equations refers to vector or matrix quantities.

[0033] In the drawings, corresponding reference numerals are used to designate like or corresponding parts.

[0034] The detailed description here benefits from a slightly deeper understanding of how load estimation is performed and the issues associated with it. A description of reference and measurement points, power measurements, power control loops, noise rise, observability of the noise floor and noise rise estimation can be found in WO2007 / 024166 and also applies to the present disclosure in a general sense.

[0035] In the following first also a very brief overview of load estimation in wireless communication systems is given.

[0036] figure 1 is a diagram illustrating states related to load estimation. Noise rise N R , defined as the ratio between the total power and the thermal noise level measured at the antenna connector, also known as the noise floor, is a measure...

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Abstract

An arrangement (90) for noise rise estimation in a wireless communication system comprises a power measuring means (45) for measuring received total wideband power. A means (52) for computing estimates of a noise floor measure bases its computation on a number of the measured received total wideband powers. A means (80) for calculating values of a biased noise rise measure bases its calculations on a number of received total wideband powers or an estimation derived therefrom and a respective one of the estimates of a noise floor measure. A means (91) for providing a measure representing a long term behaviour of the values of the biased noise rise measure is provided. A means (93) for obtaining a value of a present, unbiased noise rise measure, bases its function on the measure representing a long term behaviour of the values of the biased noise rise measure. A corresponding method is also disclosed.

Description

technical field [0001] The present invention relates generally to methods and apparatus for estimating load in cellular communication systems, and more particularly to noise rise estimation for use in code division multiple access communication systems. Background technique [0002] Wideband Code Division Multiple Access (WCDMA) telecommunication systems have many attractive properties that can be used for the future development of telecommunication services. A particular technical challenge in e.g. WCDMA and similar systems is scheduling the enhanced uplink channel to time intervals where interference conditions are favorable and where there is sufficient support for the enhanced uplink in the uplink of the cell in question The capacity of the uplink channel. It is well known that the existing users of a cell all contribute to the interference level in the uplink of a WCDMA system. Furthermore, terminals in neighboring cells also contribute to the same interference level....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00
CPCH04B17/0045H04B17/007H04B17/26H04B17/327
Inventor K·T·威格伦
Owner TELEFON AB LM ERICSSON (PUBL)