Load estimation in receiver diversity telecommunication systems

A receiver and wireless communication system technology, applied in diversity/multi-antenna systems, transmission systems, space transmit diversity, etc., can solve complex problems, achieve low RBS cost, reduce power balance requirements, and enhance performance

Active Publication Date: 2010-03-24
TELEFON AB LM ERICSSON (PUBL)
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  • Load estimation in receiver diversity telecommunication systems
  • Load estimation in receiver diversity telecommunication systems
  • Load estimation in receiver diversity telecommunication systems

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[0049] Throughout the disclosure, boldfaced words in equations refer to vector or matrix quantities.

[0050] In the drawings, corresponding reference numerals are used to indicate like or corresponding parts.

[0051] The detailed description of the present invention benefits from a somewhat deeper understanding of how load estimation is performed and issues related thereto. A description of reference and measurement points, power measurements, power control loops, noise increase, observability of the noise floor and noise increase estimation can be found in WO 2007 / 024166, which also applies to the present disclosure in a generic sense.

[0052] A first short overview of load estimation in systems without explicit receiver diversity is given.

[0053] figure 1 is a diagram showing conditions related to load estimation. Defined as the total power and thermal noise level P measured at the antenna connector N (also known as the noise floor) is the noise increase N that is t...

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Abstract

Methods and arrangements for providing load reference data in a CDMA wireless communication system with receiver diversity are presented. The method comprises measuring (210) of received total wideband power for more than one receiver branch. Probability distributions for a respective power quantity are estimated (212), related to selected state variables of an estimation algorithm, from quantities representing the measured powers using selected measurement functions of the selected state variables of the estimation algorithm. The selected state variables correspond to cell power quantities and the selected measurement functions correspond to the quantities representing the measured powers. A conditional probability distribution of noise floor measures for the respective branches are computed (214) based on the estimated probability distributions. The method ends with provision (216) of load reference data based on the computed conditional probability distributions of the noise floor measures.

Description

technical field [0001] The present invention generally relates to methods and devices for load estimation in cellular communication systems, in particular cellular communication systems utilizing receiver diversity. Background technique [0002] Wideband Code Division Multiple Access (WCDMA) telecommunication systems have many attractive properties for the future development of telecommunication services. A particular technical challenge in eg WCDMA and similar systems is scheduling the enhanced uplink channel to time intervals where interference conditions are favorable and where there is sufficient capacity in the uplink of the associated cell to support enhanced uplink traffic. 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. This is because when using Code Division Multiple Access (CDMA) technology, all ...

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Application Information

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IPC IPC(8): H04B17/00H04B7/005
CPCH04B7/08H04W52/343H04W52/42
Inventor K·T·威格伦
Owner TELEFON AB LM ERICSSON (PUBL)
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