Method and apparatus for fast cell search
AssigneeMotorola Mobility LLC
InventorsMasaya Fukuta, Hidenori Akita
Life of this patent
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Abstract
A method and apparatus for transmitting a primary and secondary synchronization channel is provided herein. During operation a transmitter will transmit a primary synchronization channel (P-SCH) in a subframe and a secondary synchronization channel (S-SCH) in the subframe. The S-SCH is modulated by a complex exponential wave and scrambled with a scrambling code. In certain embodiments of the present invention the P-SCH comprises a GCL sequence or a Zadoff-Chu sequence and the scrambling code is based on the GCL sequence index of the P-SCH.
Claims14
A method comprising the steps of:
- transmitting to a node a GCL sequence over a primary synchronization channel (P-SCH) in a subframe, wherein the GCL sequence has a GCL sequence index value;
- transmitting to the node a second sequence over a secondary synchronization channel (S-SCH) in the subframe, wherein the S-SCH containing the second sequence is scrambled with a scrambling code, and wherein the scrambling code used to scramble the S-SCH is based on the GCL sequence index of the GCL sequence transmitted over the P-SCH.
A method comprising the steps of:
- receiving by a node a GCL sequence transmitted over a primary synchronization channel (P-SCH) in a subframe, and wherein the sequence has a GCL sequence index value;
- receiving by the node a second sequence transmitted over a secondary synchronization channel (S-SCH) in the subframe, wherein the S-SCH containing the second sequence is scrambled with a scrambling code, and wherein the scrambling code used to scramble the S-SCH is based on the GCL sequence index of the sequence transmitted over the P-SCH.
An apparatus comprising:
- primary synchronization channel (P-SCH) circuitry for generating a GCL sequence, wherein the GCL sequence has a GCL sequence index value;
- and secondary synchronization channel (S-SCH) circuitry for generating a second sequence, wherein the S-SCH containing the second sequence is scrambled with a scrambling code, and wherein the scrambling code used to scramble the S-SCH is based on the GCL sequence index of the GCL sequence;
- a transmitter coupled to the P-SCH circuitry and the S-SCH circuitry for transmitting to a node the GCL sequence over the P-SCH in a subframe and for transmitting to the node the second sequence over the S-SCH in the subframe.
An apparatus comprising:
- a receiver within a node, the receiver for receiving a GCL sequence over a primary synchronization channel (P-SCH) in a subframe, wherein the sequence has a GCL sequence index value and for receiving a second sequence over a secondary synchronization channel (S-SCH) in the subframe;
- a P-SCH detector for detecting the GCL sequence index value;
- a scrambling code generator coupled to the P-SCH detector, the scrambling code generator for generating a scrambling code used to scramble the second sequence, and wherein the scrambling code used to scramble the S-SCH is based on the GCL sequence index of the sequence transmitted over the P-SCH.
Dependencies are inferred from the claim text.