Cell search using peak quality factors
AssigneeInterDigital Technology Corporation
InventorPrabhaker R. Chitrapu
Life of this patent
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Abstract
A code division multiple access communication system has a plurality of base stations. Each base station transmits a primary synchronization code (PSC) in a primary synchronization channel (PSCH). A user equipment monitors the PSCH and correlates the PSCH with the PSC. Using a result of the PSC correlation, PSCH locations are identified having a PSC peak. For each identified PSCH location, a quality factor comprising a shape factor associated with that location's PSC peak is determined. For each identified PSCH location, that identified PSCH location and the quality factor is stored. The PSCH locations and quality factors are accumulated over a number of frames and are processed using logic at algorithms to produce a reliable PSC detection.
Claims36
A method for a user equipment to store information for cell search in a code division multiple access communication system, the system having a plurality of base stations, each base station transmitting a primary synchronization code (PSC) in a primary synchronization channel (PSCH), the method comprising:
- a user equipment monitors the PSCH and correlates the PSCH with the PSC;
- identifying PSCH locations having a PSC peak using a result of the PSC correlation;
- for each identified PSCH location, determining a quality factor comprising a shape factor associated with that location's PSC peak;
- and
- storing for each identified PSCH location, that identified PSCH location and the quality factor.
A user equipment (UE) performing cell search in a code division multiple access communication system, the system having a plurality of base stations, each base station transmitting a primary synchronization code (PSC) in a primary synchronization channel (PSCH), the UE comprising:
- a PSC matched filter for correlating the PSCH with the PSC;
- a PSC evaluation device for identifying PSCH locations having a PSC peak using a result of the PSC correlation, for each identified PSCH location, for determining a quality factor comprising a shape factor associated with that location's PSC peak;
- and
- a memory for storing for each identified PSCH location, that identified PSCH location and the quality factor.
A user equipment (UE) performing cell search in a code division multiple access communication system, the system having a plurality of base stations, each base station transmitting a primary synchronization code (PSC) in a primary synchronization channel (PSCH), the UE comprising:
- means for correlating the PSCH with the PSC;
- means for identifying PSCH locations having a PSC peak using a result of the PSC correlation;
- means for each identified PSCH location, for determining a quality factor comprising a shape factor associated with that location PSCH peak;
- and
- means for storing for each identified PSCH location, that identified PSCH location and the quality factor.
A method for detecting a time location in a periodic signal having an associated period, the method comprising:
- monitoring and correlating with the periodic signal a time period of length of the periodic signal period;
- identifying time locations in that time period having a correlation peak with the periodic signal;
- for each identified peak, determining a quality factor comprising a shape factor associated with that peak;
- storing for each identified peak, that identified peak time location and the quality factor;
- and
- using the stored identified peak location and quality factor for each identified peak to determine the time location of the periodic signal.
Dependencies are inferred from the claim text.