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EP0837617A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Mobile station

Assignee: Panasonic Holdings Corp
•
Filing: 1997-10-07
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Granted: —
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Expires: 2017-10-07
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Abstract

Abstract A mobile station is provided for autonomously detect an abrupt change of a propagation environment of a radio wave signal from a base station for servicing a peripheral cell and immediately executing a peripheral cell search. In order to execute a received signal strength indication (RSSI) plural times within one period of the peripheral cell search, the mobile station operates to set a cell search execution period Δt1 to a timer (T1) of a peripheral cell search controller (15) and a RSSI measuring execution period Δt2 to a timer (T2). The RSSI measuring unit (17) operates to measure the RSSI in the receiving band at each RSSI measuring execution period Δt2 and immediately execute the peripheral cell search when the peripheral cell search controller (15) determines the RSSI is greatly varied.

Inventors

  • 👤 Takaaki Sato

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-08 18:27
CPC Classifications
H; H04; H04W; H04W36/00; H04W36/24; H04W36/30; H04W36/302; H04W36/16; H04W36/18

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 189 words
A mobile station in a mobile communication system of a CDMA (Code Division Multiple Access) type, said mobile station comprising: transceiver means (11) for transmitting and receiving a signal to and from one of base stations servicing peripheral cells; received signal level measuring means (17) for measuring a received signal strength indication (RSSI) within a receiving band, in the signal received by said transceiver means; reverse diffusing means (12) for reversely diffusing the signal received by said transceiver means; received signal quality measuring means (13) for measuring a ratio of a target signal to interference noise (SIR) at an output of said reverse diffusing means; and control means (14 to 16) for executing a search among said peripheral cells and controlling said received signal quality measuring means to measure the SIR at certain periods and at least when change of the RSSI output from said received signal level measuring means exceeds a predetermined value, and for reporting received signal quality of said peripheral cells to a network through a base station in communication with said mobile station so as to shift said mobile station to a soft hand-over state.
Claim 2
Dependent Claim 109 words
A mobile station according to in claim 1, further comprising: level variation period measuring means (38) for measuring a variation period of the RSSI output from said received signal level measuring means and determining whether or not the environment around said mobile station has lots of obstacles which obstruct propagation of a radio wave; wherein said control means (34 to 36) operates to change a searching period of said peripheral cell to a shorter period when said environment is determined to have lots of obstacles and change a searching period of said peripheral cell to a longer period when said environment is determined not to have lots of obstacles.
Claim 3
Dependent Claim 47 words
The mobile communication system including the mobile station according to claim 1 or 2 and a plurality of base stations, wherein when said mobile station is moved from an out-of-sight place of one of said base stations to an in-sight place thereof, increase of interference is suppressed.

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