Apparatus and method for performing initial cell search in wireless communication systems
First Claim
1. A user equipment (UE) configured to perform initial cell search in a wireless communication system having a plurality of base stations, each base station transmitting a common primary synchronization code (PSC) in a primary synchronization channel in conjunction with a base station specific secondary synchronization code (SSC) at a different time within a system frame, said UE receiving an input signal including the PSC and SSC from at least one of the base stations;
- said UE comprising;
a step one processor for detecting PSCs within a selected time frame in said received input signal and determining a maximum PSC location, which corresponds to the maximum PSC value detected within the frame, and producing an output complex correlation value;
a cancellation device for subtracting the PSC value at the maximum PSC location within the frame to enhance detection of the SSC;
a step two processor, coupled to the step one processor and the cancellation device, configured to determine a scrambling code group number for the cell and a frame timing offset value for locating the frame boundary; and
a step three processor, coupled to the step two processor, configured to determine the scrambling code of the cell.
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Abstract
The system and method of the present invention establishes a communication link between a user equipment (UE) and a base station in a communication system having a plurality of base stations which each transmit a common primary synchronization code (PSC) in a primary synchronization channel in conjunction with a base station specific secondary synchronization code (SSC) within a system frame, which receives with the UE an input signal including the PSC and SSC from at least one of the base stations. The UE analyzes the input signal to detect any received PSCs within a selected time period which has duration corresponding to the length of a system frame and determining a relative location of a strongest PSC within the selected time period. The input signal is then processed to remove the PSC from at least the determined PSC location. A secondary synchronization code (SSC) is then detected for the determined location from the processed signal. The communication link is then established using the detected SSCs.
43 Citations
8 Claims
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1. A user equipment (UE) configured to perform initial cell search in a wireless communication system having a plurality of base stations, each base station transmitting a common primary synchronization code (PSC) in a primary synchronization channel in conjunction with a base station specific secondary synchronization code (SSC) at a different time within a system frame, said UE receiving an input signal including the PSC and SSC from at least one of the base stations;
said UE comprising;
a step one processor for detecting PSCs within a selected time frame in said received input signal and determining a maximum PSC location, which corresponds to the maximum PSC value detected within the frame, and producing an output complex correlation value;
a cancellation device for subtracting the PSC value at the maximum PSC location within the frame to enhance detection of the SSC;
a step two processor, coupled to the step one processor and the cancellation device, configured to determine a scrambling code group number for the cell and a frame timing offset value for locating the frame boundary; and
a step three processor, coupled to the step two processor, configured to determine the scrambling code of the cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
Specification