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Signal strength measurements in cellular telecommunication systems

A technique of received signal strength, network, applied in wireless communications, error prevention/detection through diversity reception, radio relay systems, etc.

Inactive Publication Date: 2007-05-16
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Signal strength measurements in cellular telecommunication systems
  • Signal strength measurements in cellular telecommunication systems
  • Signal strength measurements in cellular telecommunication systems

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Embodiment Construction

[0014] According to the teachings of the present invention, an MS operating within the coverage area of ​​a given cell measures the Received Signal Strength Indicator (RSSI) of a neighboring cell for each frame at the appropriate moment. Each cell in the network broadcasts a synchronization channel (SCH) which provides the cell ID, information about the timing used within the cell. During candidate identification, when the MS attempts to decode the SCH, the MS calculates the signal strength of the remaining signal, which corresponds to the interference component of the signal strength. This residual signal strength is subtracted from the measured signal strength, which has been averaged over multiple frames, to get a better overall estimate of the signal strength of neighboring cells. This single measurement of interfering signal strength will not have large deviations if there are a large number of co-channel signals. In individual cases, the signal strength of the residual ...

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Abstract

A mobile station, MS, and method for estimating received signal strength of a radio signal from a neighboring cell in a cellular radio telecommunication network. The MS measures (11) the received signal strength of the radio signal over a plurality of frames, and calculates (12) an average received signal strength. During an idle frame, the MS receives (13) a synchronization channel, SCH, signal, and determines (14) a channel estimate for the SCH using a known extended training sequence. The extended training sequence is then modified (15) with the channel estimate, and the modified extended training sequence is subtracted (16) from the received SCH signal to obtain a residual signal. The MS calculates (16) a residual energy of the residual signal, and subtracts (17) the residual energy from the average received signal strength of the radio signal to obtain an estimated received signal strength of the radio signal from the neighboring cell.

Description

technical field [0001] The present invention relates to radio communication systems. More particularly and without limitation, the invention relates to a method of measuring the signal strength of signals from neighboring cells in a cellular radio communication system. Background technique [0002] In a cellular radio communication system such as the Global System for Mobile communications (GSM), each active mobile station (MS) operating within the coverage area of ​​a given cell measures the signal strength and adjacent The signal strength of the control channel of the cell. These signal strength measurements are reported to the system, which uses them to make handover and reselection decisions. However, in GSM networks, the measurements currently performed by the MS are not accurate enough, thus leading to sub-optimal handover and wrong target cell identification. [0003] In S. Craig, C. Jansson, Y. Timner and T. Tynderfeldt, entitled "Efficient Broadcast Frequency Uti...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/20H04B7/15H04B17/00H04L1/02H04L25/02H04W36/30
CPCH04W36/30H04B17/0057H04L25/0212H04L25/0228H04B17/318H04W36/302
Inventor R·拉梅什
Owner TELEFON AB LM ERICSSON (PUBL)