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Estimating communication quality

A technology of communication quality and quality, which is applied in the direction of using signal quality detectors for error detection/prevention, transmission modification based on link quality, digital transmission systems, etc., and can solve problems such as inaccessibility

Inactive Publication Date: 2008-12-10
NOKIA TECHNOLOGLES OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this only solves the quality measurement problem for the uplink, since the FER for the downlink is not available in the current GSM system

Method used

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  • Estimating communication quality
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Examples

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Embodiment Construction

[0034] This example will be described with particular reference to the GSM system. However, the invention is not limited to application in the GSM system.

[0035] The invention is particularly advantageous in conjunction with the GSM Adaptive Multi-Rate (AMR) feature. AMR is a next-generation voice codec specified by ETSI (European Telecommunications Standards Institute) for GSM networks. The AMR codec consists of a family of codecs (source and channel codecs with different tradeoff bit rates) operating on GSM full rate (FR) and half rate (HR) channels.

[0036] The ETSI AMR codec principle hopes to best adapt its operation to the prevailing radio channel conditions. At the receiving end of the AMR (of the wireless channel), the transmission quality is measured. Since the control of the used codec mode (source coding vs. channel coding bit rate) is performed by the BTS, the mobile station can only send a request for the appropriate downlink (DL) codec mode, which can be ov...

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Abstract

A method for estimating quality of communications between a transmitter and a receiver over a communications link operable to carry data in at least one of a plurality of different compressed forms, the method comprising: detecting an error rate of the communications as received; receiving at a quality estimation unit an indication of the detected error rate and an indication of the at least one of the plurality of compressed forms in use over the link; and the quality estimation unit estimating the quality of the communications by means of both the indication of the detected error rate and the indication of the at least one of the plurality of compressed forms.

Description

technical field [0001] The present invention relates to estimating communication quality, eg improving the estimation of the error rate of received data. The invention is preferably applicable to telecommunication systems, such as cellular wireless telecommunication networks. Background technique [0002] Fig. 1 schematically shows the structure of a typical cellular wireless telecommunication network, such as the GSM (Global Digital Mobile Communication) system. The network comprises a plurality of base transmitting stations (BTS) 1,2,3. Each base station has a radio transceiver capable of transmitting and receiving radio signals to and from the cells 4, 5, 6 etc. of neighboring base stations. Using these signals, the base station can communicate with mobile station (MS) terminals 7 in the cell, which itself includes a radio transceiver. Each base station is connected to a mobile switching center (MSC) (not shown) via a base station controller 8, and the mobile switching...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/20H04L1/00
CPCH04L1/0001H04L1/20
Inventor 皮特利·哈卡林
Owner NOKIA TECHNOLOGLES OY