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Method and device for noise incremental quantity estimation

A technology of noise increment and background noise, applied in transmission control/equalization, transmission monitoring, electrical components, etc., can solve problems such as reducing interference level, and achieve the effect of accurate noise increment

Active Publication Date: 2008-08-20
TELEFON AB LM ERICSSON (PUBL)
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Problems solved by technology

[0008] It follows that any increase in interference level will result in reduced SIR that cannot be compensated by increasing terminal power

Method used

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  • Method and device for noise incremental quantity estimation
  • Method and device for noise incremental quantity estimation
  • Method and device for noise incremental quantity estimation

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Embodiment Construction

[0025] Throughout the disclosure, bold letters in equations indicate vector or matrix quantities.

[0026] The detailed description is introduced with a somewhat deeper discussion of how load estimation is performed and the problems encountered with prior art solutions in order to reveal the magnitude of the problem. This is done by reference to a typical WCDMA system, but the ideas are not limited to WCDMA. They are of course also applicable in many types of cellular systems.

[0027] reference and measurement points

[0028] Figure 1 shows a typical signal chain for RS. The broadband signal received from the antenna 1 first passes through the analog signal conditioning chain 2 composed of cables, filters, etc. As the signal enters receiver 3, component-to-component variations and temperature drift leave the scale factor in this part of the system undetermined by about 2-3 dB. This is discussed further below. In the receiver 3, a number of operations are performed. For...

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Abstract

A received total wideband power (61A) in a wireless communications system is measured a number of times during a time interval. Preferably, also code powers ((C / I)i) are measured, directly or indirectly. A probability distribution of a first power quantity (63A, 63B), typically total received power is estimated from the set of measurements, preferably using Kalman filtering techniques, and preferably also a probability distribution of a second power quantity (62A, 62B) related to noise and interference signals. A conditional probability distribution of a noise rise measure to be determined is based at least on the probability distribution of the total power (63A, 63B). From that conditional probability distribution, a value of the noise rise measure is calculated. In a preferred embodiment, the noise rise measure is based on a quotient between total power and a noise floor, and the conditional probability distribution of the noise rise is therefore based on a conditional probability distribution of noise floor quantity (64). The conditional probability distribution of the noise floor quantity (64) is in turn based on the probability distribution of the extreme value of a second power quantity (62A, 62B) related to noise and interference signals and a prior determined probability distribution of a noise power floor.

Description

technical field [0001] The present invention generally relates to methods and arrangements for estimating power related quantities in a cellular communication system. Background technique [0002] Wideband Code Division Multiple Access (WCDMA) telecommunication systems have a number of 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 to schedule the enhanced uplink channel to a time interval when interference conditions are favorable and there is sufficient capacity in the uplink of the involved cells to support the enhanced uplink during this time interval link channel. It is well known that all existing users of a cell have an impact on the interference level in the uplink of a WCDMA system. Furthermore, terminals in neighboring cells also contribute to the same interference level. This is because when using CDMA technology, all users and common channels...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H04B1/707H04J13/00
CPCH04B7/005H04B1/7097H04B17/26H04B17/327H04B17/382
Inventor K·T·威格伦
Owner TELEFON AB LM ERICSSON (PUBL)
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