METHOD AND APPARATUS FOR FAST CELL SEARCH
First Claim
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1. A method for fast cell search, the method comprising the steps of:
- receiving a Generalized Chirp-Like (GCL) sequence from a transmitter;
determining a GCL index from the GCL sequence;
determining a circular shift of a GCL sequence; and
determining a transmitter identification based on the GCL index and the circular shift of the GCL sequence.
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Abstract
Reference sequences are constructed from distinct “classes” of GCL sequences that have an optimal cyclic cross correlation property. The fast cell search method disclosed detects the “class indices” with simple processing. In a system deployment that uniquely maps sequences of certain class indices along with a circular shift amount in time domain to certain cells/cell IDs, the identification of a sequence index, and its circular shift will therefore provide an identification of the cell ID.
86 Citations
16 Claims
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1. A method for fast cell search, the method comprising the steps of:
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receiving a Generalized Chirp-Like (GCL) sequence from a transmitter; determining a GCL index from the GCL sequence; determining a circular shift of a GCL sequence; and determining a transmitter identification based on the GCL index and the circular shift of the GCL sequence. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus comprising:
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a receiver receiving a Generalized Chirp-Like (GCL) sequence from a transmitter; a sequence index and circular shift detector determining a GCL index and a circular shift of the GCL sequence; and base identification circuitry determining a transmitter identification based on the GCL index and the circular shift of the GCL sequence. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method comprising the steps of:
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circularly shifting a GCL sequence having a specific index; and transmitting the circularly-shifted GCL sequence with the specific index, wherein a unique combination of the index and the circular shift uniquely identifies a transmitter. - View Dependent Claims (14)
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15. An apparatus comprising:
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a circular shifter circularly shifting a GCL sequence having a specific index; and a transmitter transmitting the circularly-shifted GCL sequence with the specific index, wherein a unique combination of the index and the circular shift uniquely identifies a transmitter.
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16. A method for fast cell search, the method comprising the steps of:
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receiving a Generalized Chirp-Like (GCL) sequence from a transmitter; determining a GCL index from the GCL sequence; determining a circular shift of a GCL sequence; and determining information from the group consisting of system bandwidth, broadcast channel bandwidth, a number of transmission antennas, and mobile unit patterns based on the GCL index and the circular shift of the GCL sequence.
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Specification