EP1037477A1
Expired / Lapsed
EP
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Mobile communication system
Assignee: Mitsubishi Electric Corp
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Filing: 1998-07-30
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Granted: —
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Expires: 2018-07-30
Abstract
Abstract A mobile communication system comprising a base station for informing the peripheral cell information of a cell under local service along with the current position of a mobile station under service and the vertex coordinates of the cell under local service, and a mobile station for estimating the position of the local station in the cell under service based on the current position and the vertex coordinates thus acquired, stopping to monitor the receiving levels of peripheral cells when the local station is located at the central point in a cell under local service and starting to monitor the receiving levels of peripheral cells according to the peripheral cell information thus acquired when the local station is located at a boundary point in a cell under local service. Since the mobile station can omit measuring of the receiving levels of peripheral cells at the central point in a cell under service and measuring of the receiving levels of peripheral cells located in a direction opposite to the moving direction at a boundary point, power can be saved in the mobile station and the size thereof can be reduced.
Inventors
- 👤 Hiroyoshi Mitsubishi Denki K. K. MASUDA
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 12:03
CPC Classifications
H; H04; H04W; H04W64/00; H04W52/00; H04W52/02; H04W52/0209; H04W52/0225; H04W52/0245; H04W48/00; H04W48/16; Y; Y02; Y02D; Y02D30/00; Y02D30/70
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
134 words
A mobile communication system comprising: a base station for notifying of neighboring cell information
of a service cell and notifying of a present position of a mobile
terminal and apex coordinates of said service cell; and a mobile terminal for presuming a position of the mobile
terminal itself in a service reception cell on the basis of said
obtained present position and said obtained apex coordinates, for
stopping a monitoring of reception levels of neighboring cells
in a case where the mobile terminal itself exists at a center point
in said service reception cell, and for starting the monitoring
of the reception levels of the neighboring cells on the basis of
said obtained neighboring cell information in a case where the
mobile terminal itself exists at a boundary point in the service
reception cell.
Claim 2
Dependent Claim
146 words
A mobile communication system according to claim 1, wherein said mobile terminal comprises: an antenna unit for performing a radio communication between
said mobile terminal and said base station; a signal processing circuit for modulating/demodulating a
signal and measuring the reception levels of the neighboring
cells; and a CPU for presuming the position of the mobile terminal itself
in the service reception cell on the basis of said obtained present
position and said obtained apex coordinates, for stopping the
monitoring of the reception levels of the neighboring cells in
the case where the mobile terminal itself exists at the center
point in the service reception cell, and for starting the
monitoring of the reception levels of the neighboring cells on
the basis of said obtained neighboring cell information in the
case where the mobile terminal itself exists at the boundary point
in the service reception cell.
Claim 3
Dependent Claim
42 words
A mobile communication system according to claim 2, wherein said signal processing circuit comprises: a modem unit for demodulating a reception signal and
modulating a transmission signal; and a reception level measuring circuit for measuring the
reception levels of the neighboring cells.
Claim 4
Dependent Claim
151 words
A mobile communication system according to claim 3, wherein said CPU comprises: a measurement candidate cell deciding module for forming a
table in which monitor candidate neighboring cell numbers are
described on the basis of said obtained neighboring cell
information; a physical position presuming module for presuming the
position of the mobile terminal itself in the service reception
cell on the basis of said obtained present position and said
obtained apex coordinates; and a reception level measurement start/stop judging module for
stopping the monitoring of the reception levels of the neighboring
cells in the case where the mobile terminal itself exists at the
center point in the service reception cell and starting the
monitoring of the reception levels of the neighboring cells in
accordance with said formed monitor candidate neighboring cell
number table in the case where the mobile terminal itself exists
at the boundary point in the service reception cell.
Claim 5
Dependent Claim
64 words
A mobile communication system according to claim 4, wherein
said measurement candidate cell deciding module comprises: a neighboring cell information obtaining module for obtaining
said neighboring cell information from said demodulated signal;
and a monitor candidate neighboring cell table forming module for
forming a table in which the monitor candidate neighboring cell
numbers are described on the basis of said obtained neighboring
cell information.
Claim 6
Dependent Claim
133 words
A mobile communication system according to claim 5, wherein
said physical position presuming module comprises: a mobile terminal self position coordinate obtaining module
for obtaining mobile terminal self position coordinates from said
demodulated signal; a cell apex coordinate obtaining module for obtaining cell
apex coordinates from said demodulated signal; and
an inner-cell position judging module of the mobile terminal
for obtaining a length of each side of a triangle which is formed
by said obtained mobile terminal self position coordinates and
two adjacent cell apex coordinates among said obtained cell apex
coordinates, for obtaining a length of a vertical line from the
mobile terminal self position to each side from said obtained
length of each side of said triangle, and for obtaining a minimum
value among the obtained lengths of the vertical lines.
Claim 7
Dependent Claim
153 words
A mobile communication system according to claim 6, wherein
said reception level measurement start/stop judging module
comprises: a threshold value comparing module for comparing said
obtained minimum value with a predetermined threshold value; a neighboring cell measurement stopping module for stopping
the monitoring of the reception levels of the neighboring cells
by recognizing that the mobile terminal itself exists at the
center point in the service reception cell in a case where said
minimum value is larger than or equal to said threshold value;
and a neighboring cell measurement requesting module for
recognizing that the mobile terminal itself exists at the boundary
point in the service reception cell in a case where said minimum
value is smaller than said threshold value and starting the
monitoring of the reception levels of the neighboring cells in
the moving direction by said reception level measuring circuit
in accordance with said monitor candidate neighboring cell number
table.
References Cited (Backward Citations)
No citation records indexed.
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