Cell search process for wireless communication system
First Claim
1. A method of cell search in a wireless communication systems having a plurality of base stations and a mobile station, each of the plurality of base stations serving a separate cell within a service area and transmitting a common primary synchronisation code (PSC) in a primary synchronisation channel within a slot of a radio frame, the method including the steps of;
- (a) scanning through radio channels in scanning increments corresponding to a standard channel raster;
(b) estimating the PSC signal-to-Doise ratio of each radio channel;
(c) if a PSC signal-to-noise ratio is above a first predetermined threshold level, completing a cell search procedure including slot synchronisation, frame synchronisation and scrambling code detection steps for that radio channel;
(d) if the cell search procedure is successfully completed for the radio channel in step (c), increasing the scanning increments to the broadcast frequency separation between cells;
(e) when all radio channels are scanned in step (d), sorting the scanned radio channels in descending order by PSC signal-to-noise ratio; and
(f) performing the cell search-procedure on each sorted radio channel in descending order.
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Accused Products
Abstract
A method of cell search in a wireless communication systems having a plurality of base stations and a mobile station, each of the plurality of base stations serving a separate cell within a service area and transmitting a common primary synchronisation code (PSC) in a primary synchronisation channel within a slot of a radio frame, the method including the steps of: (a) scanning (72) through radio channels in scanning increments corresponding to a standard channel raster; (b) estimating (98) the PSC signal-to-noise ratio of each radio channel; (c) if a PSC signal-to-noise ratio is above a first predetermined threshold level (100), completing a cell search procedure including slot synchronisation, frame synchronisation and scrambling code detection steps for that radio channel; (d) if the cell search procedure is successfully completed (112) for the radio channel in step (c), increasing the scanning increments to the broadcast frequency separation between cells; (e) when all radio channels are scanned in step (d), sorting (74) the scanned radio channels in descending order by PSC signal-to-noise ratio; and (f) performing (76) the cell search procedure on each sorted radio channel in descending order.
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Citations
6 Claims
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1. A method of cell search in a wireless communication systems having a plurality of base stations and a mobile station, each of the plurality of base stations serving a separate cell within a service area and transmitting a common primary synchronisation code (PSC) in a primary synchronisation channel within a slot of a radio frame, the method including the steps of;
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(a) scanning through radio channels in scanning increments corresponding to a standard channel raster;
(b) estimating the PSC signal-to-Doise ratio of each radio channel;
(c) if a PSC signal-to-noise ratio is above a first predetermined threshold level, completing a cell search procedure including slot synchronisation, frame synchronisation and scrambling code detection steps for that radio channel;
(d) if the cell search procedure is successfully completed for the radio channel in step (c), increasing the scanning increments to the broadcast frequency separation between cells;
(e) when all radio channels are scanned in step (d), sorting the scanned radio channels in descending order by PSC signal-to-noise ratio; and
(f) performing the cell search-procedure on each sorted radio channel in descending order. - View Dependent Claims (2)
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3. A mobile station for use in a wireless communication system including a plurality of base stations, each of the plurality of base stations serving a separate cell within a service area and transmitting a common primary synchronisation code (PSC) in a primary synchronisation channel within a slot of a radio frame, the mobile station including:
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scanning means for scanning through possible radio channels;
cell search means for completing a cell search procedure including slot synchronisation means, frame synchronisation means and scrambling code detection means; and
processing means for controlling operation of the mobile station, wherein the scanning means scans through possible radio channels in scanning increments corresponding to a standard channel raster;
the slot synchronisation means estimates the PSC signal-to-noise ratio of each radio channel;
the cell search means acts to complete the cell search procedure for that radio channel, If the processing means determines that the PSC signal-to-noise ratio is above a first predetermined threshold level;
the processing means increasing the scanning increments to the broadcast frequency separation between cells, if the cell search procedure is successfully completed for that radio channel;
the processing means further acting to sort the scanned radio channels in descending order by PSC signal-to-noise ratio when all radio channels are scanned;
the cell search means performing the cell search procedure on each sorted radio channel in descending order. - View Dependent Claims (4)
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5. A method of cell search in a wireless communication system having a plurality of base stations and a mobile station, each of the plurality of the base stations serving a separate cell within a service area, the method comprising the steps of:
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executing the cell search at a first frequency interval by scanning a band; and
executing the cell search at a second frequency interval wider than the first frequency interval.
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6. A mobile station for use in a wireless communication system having a plurality of base stations each of which serving a separate cell within a service area, characterized in that the mobile station executes cell search in a first phase by scanning a band a first frequency interval and in a second phase by scanning the band at a second frequency interval wider than the first frequency interval.
Specification