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A method and arrangement concerning speech quality in radio communication

A wireless channel and equipment technology, applied in wireless communication, multiplexing communication, communication between multiple stations, etc., to achieve the effect of improving overall voice quality and capacity utilization

Inactive Publication Date: 2002-05-08
TELEFON AB LM ERICSSON (PUBL)
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The present invention mainly solves the problem of objectively estimating the speech quality of the speech communication in the wireless channel between the mobile station and the base station in the digital wireless telephone system (PLMN), the speech quality estimation value received thus should be equal to the speech quality felt subjectively by the user the best possible degree of agreement

Method used

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  • A method and arrangement concerning speech quality in radio communication
  • A method and arrangement concerning speech quality in radio communication
  • A method and arrangement concerning speech quality in radio communication

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Embodiment Construction

[0029] Description of preferred embodiments

[0030]FIG. 1 is a block diagram illustrating a communication system 1 . The communication system 1 includes a digital PLMN 3 . Included within the PLMN 3 is a first MSC 5 (Mobile Services Switching Center) connected by lines to the first, second and third base stations BS1, BS2 and BS3. The first, second and third base stations BS1, BS2 and BS3 serve the respective cells C1, C2 and C3, respectively. The first mobile station MS1 ​​is located in the cell C1 served by the first base station BS1, the second mobile station MS2 is located in the cell C2 served by the second base station BS2, and the third and fourth mobile stations MS3 and MS4 are located in the third base station BS3 Served in cell 3. Also included within the PLMN 3 are a second and a third MSC 7 and MSC 9 , the two switching centers being connected to each other and also to the first MSC 5 by connecting lines. Similar to the first MSC 5, the second MSC 7 is connect...

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Abstract

The present invention relates to estimating the speech quality obtained with a radio channel (37) for speech communication between a mobile station (MS1) and a base station (BS1) in a digital radio telephony system (3) (PLMN), wherewith the speech quality estimation achieved coincides to the greatest possible extent with the user's subjective estimation of the speech quality. A bit error rate associated with the radio channel (37) is measured. A fading frequency associated with the radio channel (37) is also measured. According to the invention, the speech quality is estimated with the aid of the measured bit error content and also with the aid of the measured fading frequency.

Description

field of invention [0001] The present invention relates to methods and devices in the field of wireless communications, and more particularly to those parts of the field concerned with speech quality estimation when speech communications are carried out using wireless channels. Background of the invention [0002] A conventional public land mobile network (PLMN) (or, in other words, a cellular radiotelephone system) comprises a land system and one or more mobile stations. A land system generally comprises at least one Mobile Services Switching Center (MSC) connected to one or more radio base stations (hereinafter, simply referred to as base stations). One or more of the MSCs are usually connected to the Public Switched Telephone Network (PSTN), in other words, the conventional non-mobile telephone system. Each base station serves a geographical area called a cell. Mobile stations located within the cell are able to communicate with the base station via a radio interface. ...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04B7/26H04J3/00H04W36/30
CPCH04W36/30H04W36/302
Inventor M·阿内希尔T·伦德博里
Owner TELEFON AB LM ERICSSON (PUBL)
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