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EP0615355A2
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Mobile station and cell selecting method for code division multiplex access mobile communication
Assignee: NTT Docomo Inc
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Filing: 1994-03-07
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Granted: —
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Expires: 2014-03-07
Abstract
Abstract A received signal (S R ) of a control channel of each cell is despread by each spreading code in a correlation detector (22). The received level of the despread output in a window, including its peak, is measured in a level measuring part and an interference signal level outside the window is also measured. In a control part (25) the difference or ratio between the measured received level and the interference signal level is obtained as a comparison signal for each spreading code, and the comparison signal is compared in terms of magnitude to thereby determine the visited cell of a mobile station (20).
Inventors
- 👤 Narumi Umeda
- 👤 Toyota Nishi
- 👤 Akihiro Higashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 20:08
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/24; H04B7/26; H04B7/2628; H04W; H04W48/00; H04W48/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
170 words
A code division multiple access mobile station comprising: correlation detecting means whereby a received signal spectrum-spread by a spreading code of a predetermined period is despread by a prepared spreading code to detect the magnitude of the correlation therebetween; first level measuring means which measures, every said predetermined period, a received level in a window of a predetermined time width defined in synchronization with a peak of the output from said correlation detecting means and outputs said measured received level as an intra-window received level; second level measuring means which measures the level of the output from said correlation detecting means outside said window in said predetermined period and outputs said measured level as an interference signal level; calculating means which uses said intra-window received level and said interference signal level to calculate a comparison signal from which the influence of an interference wave has been removed; and control means which compares said comparison signal for each said spreading code to thereby determine a visited cell of said mobile station.
Claim 2
Dependent Claim
33 words
The mobile station of claim 1 further comprising timing generating means for generating a timing signal which defines said window in synchronization with the peak of the output from said correlation detecting means.
Claim 3
Dependent Claim
30 words
The mobile station of claim 2 wherein said first level measuring means is means for measuring the mean level of the output from said correlation detecting means in said window.
Claim 4
Dependent Claim
26 words
The mobile station of claim 1, 2, or 3 wherein said comparison signal is the ratio between said intra-window received signal and said interference signal level.
Claim 5
Dependent Claim
28 words
The mobile station of claim 1, 2, or 3 wherein said comparison signal is a signal obtained by subtracting said interference signal level from said intra-window received level.
Claim 6
Dependent Claim
162 words
A cell selecting method for a code division multiplex access mobile communication system, comprising: a step wherein a base station transmits, over a level monitoring channel, information of level monitoring spreading codes assigned to adjoining cells; a step wherein a mobile station receives, detects and stores said information of level monitoring spreading codes of said adjoining cells transmitted from said base station; a step wherein, at the time of determining a visited cell, a spectrum-spread received signal is despread by each of said stored level monitoring spreading codes to obtain a signal, the received level of said signal in a window, including its peak, is measured and an interference level of said received signal outside said window is measured; a step wherein a comparison signal is generated using said received level and said interference level; and a step wherein said comparison signal is compared for each of said level monitoring spreading codes to thereby determine said visited cell of said mobile station.
Claim 7
Dependent Claim
22 words
The method of claim 6 wherein said comparison signal is a signal obtained by subtracting said interference level from said received level.
Claim 8
Dependent Claim
22 words
The method of claim 6 wherein said comparison signal is a signal obtained by dividing said received level by said interference level.
References Cited (Backward Citations)
No citation records indexed.
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