Apparatus and method for searching transmission signal from neighboring base station
AssigneeLG Electronics Inc.
InventorJae-Wook Song
Life of this patent
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Abstract
An apparatus and a method for searching a transmission signal from a neighboring base station acquires a location of present cell through initial cell searching, sets an operation mode according to whether or not rough location information of neighboring cell is provided by the present cell, sets a mask window based on time information of the cell which is already known, searches the section of mask window and remaining sections selectively according to the operation mode, and acquires precise time information of neighboring cells using energy peak searched from the selected section. In this manner the neighboring cells can be searched rapidly and easily by adding the window masking function to the initial cell searching apparatus.
Claims28
An apparatus for searching a transmission signal from a neighboring base station, comprising:
- a matched filter for searching energy of a transmission channel signal;
- an energy storing unit for storing the energy identified by the matched filter by time offsets;
- a processor for controlling transmission signal acquisition by a present base station and transmission signal acquisition by a neighboring base station;
- a window controller for window masking a location of a base station which is known based on controls of the upper processor;
- a switching unit for masking the energy outputted from the energy storing unit based on controls of the window controller;
- and
- a peak detecting unit for detecting a peak of the energy output from the switching unit and acquiring a signal transmitted from the neighboring base station.
An apparatus for searching neighboring cells, comprising:
- a matched filter for searching a primary synchronous channel signal;
- an energy storing unit for storing energy searched by the matched filter by offsets;
- a window controller for window masking a location of a cell acquired through an initial cell search;
- a switching unit for outputting one of the energy outputted from the energy storing unit and a mask value according to control of the window controller;
- and
- a peak detecting unit for detecting a peak of the energy outputted from the switching unit and acquiring time information of neighboring cells.
A method for searching neighboring cells comprising:
- performing an initial cell search;
- setting a mask window based on a location of a present cell which is acquired through the initial cell search;
- searching energy of a transmission channel signal transmitted from neighboring cells;
- storing the energies by time offsets;
- searching the section of the set mask window and any remaining sections other than the section of the mask window selectively according to operation mode;
- and
- acquiring locations of neighboring cells using energy peaks identified in the selected section.
A method for locating cells in a communications service area, comprising:
- masking a signal from a first cell in a transmission channel;
- detecting a peak energy signal within the transmission channel;
- and
- identifying a second cell based on the peak energy signal.
Dependencies are inferred from the claim text.