Cell search method and mobile station apparatus
First Claim
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1. A cell search method comprising:
- receiving information with respect to a search window from a base station apparatus;
dividing the search window of a base station apparatus to be searched into a plurality of search widths;
detecting a correlation of each of the plurality of search widths in parallel to obtain a correlation value in a first integrating time;
selecting a phase in order of larger correlation value;
detecting the correlations of each of these selected phases in a second integrating time longer than the first integrating time;
combining the correlation values by the number of demodulable phases starting from the largest detected correlation value; and
keeping the cell search cycle constant when the number of peripheral base station apparatuses whose search window is notified from the base station apparatus is less than a predetermined value, by inserting a non-operation time after a search ends.
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Abstract
Search control means 8 of a mobile station apparatus divides a search window received into a number of search widths corresponding to the number of search correlators 3 and makes each of correlators 3 carry out correlative detection about these divided search widths simultaneously in a 1st integrating time. It further selects multiple phases in descending order of detected correlative values, makes each correlator carry out correlative detection about these selected phases simultaneously in an integrating time longer than the 1st integrating time and combines powers of correlative values by the number of demodulable phases starting from the largest detected correlative value.
71 Citations
10 Claims
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1. A cell search method comprising:
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receiving information with respect to a search window from a base station apparatus; dividing the search window of a base station apparatus to be searched into a plurality of search widths; detecting a correlation of each of the plurality of search widths in parallel to obtain a correlation value in a first integrating time; selecting a phase in order of larger correlation value; detecting the correlations of each of these selected phases in a second integrating time longer than the first integrating time; combining the correlation values by the number of demodulable phases starting from the largest detected correlation value; and keeping the cell search cycle constant when the number of peripheral base station apparatuses whose search window is notified from the base station apparatus is less than a predetermined value, by inserting a non-operation time after a search ends. - View Dependent Claims (2, 3, 4)
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5. A mobile station apparatus, comprising:
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a plurality of search correlators for detecting a correlation of a pilot channel assigned to a base station apparatus to be searched to obtain a correlation value; search control means for controlling phases to be detected according to the correlation and operations of the search correlators; reception means for receiving a code phase and search window of a pilot channel assigned to a peripheral base station apparatus; wherein said search control means divides said received search window into a plurality of search widths corresponding to the number of said search correlators, makes each correlator detect the correlation of the divided search width simultaneously in a 1st integrating time to obtain the correlation value, selects a plurality of phases in order of larger correlation value in descending order of these detected correlative values, makes each correlator detect the correlation of each of the selected phases simultaneously in an integrating time longer than the first integrating time to obtain the correlation values, and combines the correlation values by the number of demodulable phases starting from the largest detected correlation value; and wherein search control means inserts a non-operation time after a search ends when the number of peripheral base station apparatuses whose search window is notified from the base station is less than a predetermined value to which the base station apparatus notified the search window falls short of a given number. - View Dependent Claims (6, 7, 8, 9, 10)
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Specification