Method for determining the transmission quality of a home traffic connection in a mobile radio system
First Claim
1. A method for determining a transmission quality of a home traffic connection in a mobile radio system, where the mobile radio system includes two-way radio channels, each channel having two carrier frequencies at a desired frequency distance from one another:
- the home traffic connection, which is established between a first base station and a first subscriber mobile station, utilizes a first radio channel; and
wherein the first radio channel can be reused within the mobile radio system by a second base station and another subscriber mobile station as a traffic connection whose radio signals are liable to interfere with the radio signals of the home traffic connection at the first base station, comprising the following method steps;
measuring, at a first location, the combined received signal strength (C+I) of the carrier frequencies on the first radio channel during the transmission of speech or data;
measuring, at the first location, the signal strength of an interfering carrier frequency (I) on the first radio channel in a time interval during which the carrier frequency of the home traffic connection is closed down; and
calculating the transmission quality as the quotient (C/I), where (C) is the signal strength of the carrier frequency of the home traffic connection and (I) is the signal strength of the interfering carrier frequency.
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Accused Products
Abstract
A base station (BS1) in a mobile radio system has connection in a first cell (1) with a mobile station (MS1) on a two-way channel (K1) having two carrier frequencies. A base station (BS2) and a mobile station (MS2) in a second cell (2) remote from the first cell are mutually connected on the channel (K1) disturbing the connection in the first cell (1) through signals (F1, R1). The combined signal strength of the disturbing (F1, R1) and the home connection (K1) is measured. The signal strength of solely the disturbing connection (F1, R1) is also measured, the carrier frequency of home connection being closed down. The quotient between these signal strengths is a measure of connection quality. The stations (MS1,BS1) may include means for closing down their respective carrier frequencies when no information is transmitted, the receiving station then measuring the disturbing signal strength. In time-shared systems, the disturbing signal can be measured during time slots which belong to connections other than the home connection.
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Citations
9 Claims
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1. A method for determining a transmission quality of a home traffic connection in a mobile radio system, where the mobile radio system includes two-way radio channels, each channel having two carrier frequencies at a desired frequency distance from one another:
- the home traffic connection, which is established between a first base station and a first subscriber mobile station, utilizes a first radio channel; and
wherein the first radio channel can be reused within the mobile radio system by a second base station and another subscriber mobile station as a traffic connection whose radio signals are liable to interfere with the radio signals of the home traffic connection at the first base station, comprising the following method steps;measuring, at a first location, the combined received signal strength (C+I) of the carrier frequencies on the first radio channel during the transmission of speech or data; measuring, at the first location, the signal strength of an interfering carrier frequency (I) on the first radio channel in a time interval during which the carrier frequency of the home traffic connection is closed down; and calculating the transmission quality as the quotient (C/I), where (C) is the signal strength of the carrier frequency of the home traffic connection and (I) is the signal strength of the interfering carrier frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- the home traffic connection, which is established between a first base station and a first subscriber mobile station, utilizes a first radio channel; and
Specification
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- Resources
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Current AssigneeTelefonaktiebolaget LM Ericsson
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Original AssigneeTelefonaktiebolaget LM Ericsson
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InventorsBorg, Lars U.
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Primary Examiner(s)Urban, Edward F.
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Assistant Examiner(s)FAILE, ANDREW I
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Application NumberUS07/691,221Time in Patent Office1,265 DaysField of Search455/33.1, 455/53.1, 455/54.1, 455/56.1, 455/62-63, 455/67.3, 455/67.4, 455/68, 455/226.2, 455/226.3, 370/95.3US Class Current455/423CPC Class CodesH04W 72/541 using the level of interfer...
