Cell searching apparatus and method in asynchronous mobile communication system
First Claim
1. An asynchronous mobile communication system for searching a base station, comprising:
- a plurality of base stations, at least a portion of which is allocated adjacent scrambling code groups (SCG); and
a mobile terminal which detects a first SCG based on first detected slot synchronization information detects a second SCG, determines whether the first SCG and second SCG are adjacent.
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Accused Products
Abstract
A cell searching apparatus and method in an asynchronous mobile communication system allocates an adjacent SCG to each base station according to adjacent degrees. When a mobile terminal is powered on, the mobile terminal receives PSCs and SSCs from the base stations. Multiple searching of SSCs is then performed based on each slot synchronization followed by a frame synchronization and SCG detection through the first searched SSC. If the detected SCG is not an SCG of a base station to which the mobile terminal belongs, the cell searching apparatus detects an SCG with a large size among the adjacent SCGs and detects an SC by using the greatest SCG. Frame synchronization and SCG detection are therefore quickly performed in a cell searching, resulting in a quick search searching.
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Citations
27 Claims
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1. An asynchronous mobile communication system for searching a base station, comprising:
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a plurality of base stations, at least a portion of which is allocated adjacent scrambling code groups (SCG); and
a mobile terminal which detects a first SCG based on first detected slot synchronization information detects a second SCG, determines whether the first SCG and second SCG are adjacent. - View Dependent Claims (2, 3, 4, 5)
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6. A cell searching apparatus in an asynchronous mobile communication system, comprising:
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a filter which removes a noise component in an RF signal transmitted from base stations;
a slot synchronizer which serially performs slot synchronization using PSCs repeatedly detected after a slot period among a plurality of PSCs outputted from the filter;
a processor which controls a slot synchronization, frame synchronization, and SCG detecting operation;
a plurality of frame synchronizers which detect SCGs using each SSC outputted from the filer, and determines a desired SCG under control of the processor based on the first detected SCG; and
a scrambling code detector which detects an SC using the determined SCG. - View Dependent Claims (7, 8, 9)
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10. A cell searching apparatus in an asynchronous mobile communication system, comprising:
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a filter which removes a noise component in an RF signal transmitted from base stations;
a slot synchronizer which serially performs a slot synchronization using PSCs repeatedly detected after a slot period among a plurality of PSCs outputted from the filter;
a processor which controls a slot synchronization, frame synchronization and SCG detecting operation;
a frame synchronizer which serially performs frame synchronization and SCG detecting operation using each SSC outputted from the filer on each slot synchronization information, and determining a desired SCG under the control of the processor based on the first detected SCG; and
a scrambling code detector which detects an SC using the determined SCG. - View Dependent Claims (11, 12, 13)
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14. An SCG allocating method in an asynchronous mobile communication system, comprising:
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setting one of a plurality of base stations as a reference base station and allocating a reference SCG thereto; and
allocating an adjacent SCG of the reference SCG to at least one of the base stations adjacent to the reference base station.
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15. A cell searching method in an asynchronous mobile communication system, comprising:
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serially performing slot synchronization using PSCs received from a plurality of base stations;
performing multiple frame synchronization and SCG detection using SSCs received from the base stations based on each serially performed slot synchronization;
checking whether a first detected SCG is a desired one;
determining a suitable SCG among adjacent SCGs of the first detected SCG if the first detected SCG is not a desired one; and
completing a base station searching using the determined SCG. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A method for communicating information in a mobile communication system, comprising:
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selecting a first base station from a plurality of base stations;
allocating a first scrambling code group to the selected base station;
selecting a second base station from the plurality of base stations;
determining whether the second base station is in a cell adjacent to a cell of the first base station; and
allocating a second scrambling code group to the second base station if the second base station is in a cell adjacent to the first base station. - View Dependent Claims (23, 24, 25, 26, 27)
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Specification