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Load estimation in wireless communication

A wireless communication system and useful signal technology, applied in the field of load estimation in wireless communication, to achieve the effect of increasing available capacity

Inactive Publication Date: 2014-11-05
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, for systems using chip equalizers, there is also the problem of how to provide a reliable measure of noise growth

Method used

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  • Load estimation in wireless communication
  • Load estimation in wireless communication
  • Load estimation in wireless communication

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Embodiment Construction

[0026] Throughout the disclosure, boldface letters in formulas denote vector or matrix quantities.

[0027] In the drawings, corresponding reference numerals are used for similar or corresponding parts.

[0028] The present invention relates to devices and methods in wireless communication systems. figure 1 A schematic diagram of an embodiment of such a wireless communication system 150 is shown. The radio base station 160 communicates via its antenna 39 with a number of user equipments (UEs) 170 located within a cell 151 of the radio communication system 150 . The wireless signal transmitted from RBS 160 to UE 170 is called downlink signal 181 , and the wireless signal transmitted from UE 170 to RBS 160 is called uplink signal 180 . The present invention primarily considers uplink signals, whereby means for noise growth estimation are typically provided in the RBS 160 . In addition to the intended uplink signal 180 , the RBS 160 also receives an interfering signal 183 .

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Abstract

A method for noise rise estimation in a wireless communication system comprises measuring (210) of received total wideband power a plurality of times and computing (212) an estimate of a noise floor measure based on a number of the measured received total wideband powers. An interference whitening is performed (214) based on one of GRAKE, GRAKE−and chip equalizer. A useful signal power for the first user after interference whitening is determined (216). A first user noise floor compensation factor is derived (218) based on combining weights for the first user used in the interference whitening. A code power to interference ratio measure for said first user is obtained (220). A noise rise measure is calculated (222), based at least on the useful signal power for the first user after interference whitening, the first user noise floor compensation factor, the code power to interference ratio measure for the first user and the noise floor measure.

Description

technical field [0001] The present invention generally relates to a method and device for estimating power correlation quantities in a cellular communication system, and specifically relates to the above method and device in a cellular communication system using interference whitening. Background technique [0002] Wideband Code Division Multiple Access (WCDMA) telecommunication systems have many attractive attributes that can be used for the future development of telecommunication services. Specifically, the enhanced uplink of the WCDMA system is an element of the WCDMA mobile broadband solution. Currently, in order to maintain the stability of a WCDMA cell (possibly a cell with an enhanced uplink), it is necessary to keep the load below a certain level. Since at least in WCDMA most uplink user channels are power controlled, this requirement on loading is met. The goal of the power control is to maintain the received power level of each signal at a certain signal-to-inter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/00H04B7/005
CPCH04B17/0045H04B17/005H04B17/0042H04B17/0055H04B17/006H04B17/309H04B17/327H04B17/336H04B17/345
Inventor 安德斯·佩尔森卡尔·托尔比约恩·维格伦
Owner TELEFON AB LM ERICSSON (PUBL)
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