Einzeltreffer — DigiBib

An eNB may determine a root for a sequence to be included in a signal to a UE. The eNB may generate a generalized Chu sequence based on the root and scramble the generalized Chu sequence using a pseudorandom sequence that is common to a plurality of eNBs. The eNB may transmit the scrambled generalized Chu sequence to indicate the beginning of a downlink transmission. The UE may receive this scrambled generalized Chu sequence and determine if a beginning of a downlink transmission from a serving eNB based on the received generalized Chu sequence and an expected generalized Chu sequence.

Titel:	METHOD AND APPARATUS FOR SIGNALING USING GENERALIZED CHU SEQUENCES
Link:	View record in USPTO Patent Applications (Volltext)
Veröffentlichung:	2017
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Applications Sprachen: English Document Number: 20170280336 Publication Date: September 28, 2017 Appl. No: 15/445910 Application Filed: February 28, 2017 Claim: 1. A method of wireless communication at an evolved Node B (eNB), the method comprising: determining a root; generating a generalized Chu sequence based on the determined root; scrambling the generalized Chu sequence using a pseudorandom sequence that is common to a plurality of eNBs; and transmitting the scrambled generalized Chu sequence. Claim: 2. The method of claim 1, wherein the root is determined based on at least one of a cell identifier (ID) and a slot index. Claim: 3. The method of claim 1, wherein generalized Chu sequence is defined as X(n)=e−jπun(n+1)/N, wherein N is a length of the Chu sequence, n=0, . . . , N−1, and u is the root. Claim: 4. The method of claim 3, wherein u is not co-prime with N. Claim: 5. The method of claim 1, wherein a length of the generalized Chu sequence is 256. Claim: 6. The method of claim 1, wherein the scrambled generalized Chu sequence is used as cell-specific reference signal or channel usage beacon signal. Claim: 7. The method of claim 1, wherein the pseudorandom sequence is a gold sequence. Claim: 8. A method of wireless communication at a user equipment (UE), the method comprising: receiving a first sequence over the air; generating a generalized Chu sequence that is expected to be transmitted from a serving eNB; and determining whether the first sequence indicates a beginning of a downlink transmission from the serving eNB based on the first sequence and the generalized Chu sequence. Claim: 9. The method of claim 8, wherein determining whether the first sequence indicates the beginning of the downlink transmission from the serving eNB based on the first sequence and the generalized Chu sequence comprises: conjugating the generalized Chu sequence ; multiplying the first sequence by the conjugate of the generalized Chu sequence to generate a third sequence; applying an inverse fast Fourier transform (IFFT) to the third sequence to generate a fourth sequence; and determining whether the first sequence indicates the beginning of the downlink transmission from the serving eNB based on the fourth sequence. Claim: 10. The method of claim 9, wherein determining whether the first sequence indicates the beginning of the downlink transmission from the serving eNB based on the fourth sequence comprises: determining a signal window associated with the fourth sequence; determining a noise window associated with the fourth sequence; determining a first maximum tap energy in the signal window; determining a second maximum tap energy in the noise window; and comparing a quotient of the first maximum tap energy divided by the second maximum tap energy to a threshold. Claim: 11. The method of claim 10, wherein the signal window is determined to be a first portion of the fourth sequence, and wherein the noise window is determined to be a second portion of the fourth sequence, the second portion excluding the first portion. Claim: 12. The method of claim 8, wherein the generalized Chu sequence is generated based on at least one of a root, a cell identifier (ID), and a slot index associated with a serving cell. Claim: 13. The method of claim 8, further comprising: descrambling the first sequence using a pseudorandom sequence that is common to a plurality of eNBs. Claim: 14. The method of claim 13, wherein the pseudorandom sequence is a gold sequence. Claim: 15. The method of claim 8, wherein a length of the generalized Chu sequence is 256. Claim: 16. The method of claim 8, wherein receiving the first sequence comprises receiving one of a cell-specific reference signal or a channel usage beacon signal that includes the first sequence. Claim: 17. An evolved Node B (eNB) comprising: means for determining a root; means for generating a generalized Chu sequence based on the determined root; means for scrambling the generalized Chu sequence using a pseudorandom sequence that is common to a plurality of eNBs; and means for transmitting the scrambled generalized Chu sequence. Claim: 18. The eNB of claim 17, wherein the means for determining the root is configured to determine the root based on at least one of a cell identifier (ID) and a slot index. Claim: 19. The eNB of claim 17, wherein generalized Chu sequence is defined as X(n)=e−jπun(n+1)/N, wherein N is a length of the Chu sequence, n=0, . . . , N−1, and u is the root. Claim: 20. The eNB of claim 19, wherein u is not co-prime with N. Claim: 21. The eNB of claim 17, wherein a length of the generalized Chu sequence is 256. Claim: 22. The eNB of claim 17, wherein the scrambled generalized Chu sequence is used as cell-specific reference signal or channel usage beacon signal. Claim: 23. The eNB of claim 17, wherein the pseudorandom sequence is a gold sequence. Claim: 24. A user equipment (UE) comprising: means for receiving a first sequence over the air; means for generating a generalized Chu sequence that is expected to be transmitted from a serving eNB; and means for determining whether the first sequence indicates a beginning of a downlink transmission from the serving eNB based on the first sequence and the generalized Chu sequence. Claim: 25. The UE of claim 24, wherein the means for determining whether the first sequence indicates the beginning of the downlink transmission from the serving eNB based on the first sequence and the generalized Chu sequence is configured to: conjugate the generalized Chu sequence; multiply the first sequence by the conjugate of the generalized Chu sequence to generate a third sequence; apply an inverse fast Fourier transform (IFFT) to the third sequence to generate a fourth sequence; and determine whether the first sequence indicates the beginning of the downlink transmission from the serving eNB based on the fourth sequence. Claim: 26. The UE of claim 25, wherein means for determining whether the first sequence indicates the beginning of the downlink transmission from the serving eNB based on the fourth sequence is configured to: determine a signal window associated with the fourth sequence; determine a noise window associated with the fourth sequence; determine a first maximum tap energy in the signal window; determine a second maximum tap energy in the noise window; and compare a quotient of the first maximum tap energy divided by the second maximum tap energy to a threshold. Claim: 27. The UE of claim 26, wherein the signal window is determined to be a first portion of the fourth sequence, and wherein the noise window is determined to be a second portion of the fourth sequence, the second portion excluding the first portion. Claim: 28. The UE of claim 24, wherein the generalized Chu sequence is generated based on at least one of a root, a cell identifier (ID), and a slot index associated with a serving cell. Claim: 29. The UE of claim 24, further comprising: means for descrambling the first sequence using a pseudorandom sequence that is common to a plurality of eNBs. Claim: 30. The UE of claim 29, wherein the pseudorandom sequence is a gold sequence. Current International Class: 04; 04; 04

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METHOD AND APPARATUS FOR SIGNALING USING GENERALIZED CHU SEQUENCES