# US 10,873,434 B2 · Signal processing method and apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,873,434 B2 - Document ID: US10873434B2 - Status: Granted - Kind: B2 - Application number: 16/230,791 - Filed: 2018-12-21 - Published: 2019-04-25 - Granted: 2020-12-22 - Earliest claimed: 2017-08-11 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Jianqin Liu - Web page: https://patentgrep.com/patent/US10873434B2 ## CPC - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04J 11/0069: {Cell search, i.e. determining cell identity [cell-ID] (design of multiplexing codes H04J13/00; processing access restriction or access information H04W48/16; discovery of network devices for network data management H04W8/005; sounding signals for channel estimation H04L25/0226; structure of reference signals in multicarrier modulation systems H04L27/2613; frame, time or carrier synchronisation in multicarrier modulation systems H04L27/2655)} - H04J 13/0029: {Gold} - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals} - H04L 27/2627: {Modulators} - H04W 56/001: {Synchronization between nodes} - H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method includes: generating a reference signal sequence based on a first m-sequence and a second m-sequence, where the reference signal sequence is a gold sequence, a cyclic shift value of the first m-sequence is determined based on a physical cell identifier and first timing information, and for a same physical cell identifier, a difference between two cyclic shift values of the first m-sequence that are separately determined based on the physical cell identifier and any two pieces of adjacent first timing information is L1, where L1 is a positive integer, and the first timing information includes a synchronization signal block time index or a first part of the synchronization signal block time index; and after modulating the generated reference signal sequence, mapping a modulated reference signal sequence to N subcarriers to obtain a reference signal, where N is a positive integer greater than or equal to 1. ## Claims ### Claim 1 A method, comprising: generating, by a communications device, a reference signal sequence of a physical channel in accordance with a first m-sequence and a second m-sequence, wherein the reference signal sequence is a gold sequence, the reference signal sequence is related to a physical cell identifier and first timing information, and the first timing information comprises at least a first part of a synchronization signal block time index; modulating the generated reference signal sequence; and in response to modulating the generated reference signal sequence, mapping a modulated reference signal sequence to N subcarriers to obtain a reference signal, wherein N is a positive integer greater than or equal to 1; and wherein a cyclic shift value m0 of the first m-sequence meets: m0=((NcellID+a*SS_block_idx)*b)mod c; or m0=(b*NcellID+d*SS_block_idx)mod c, where wherein NcellID represents an identifier corresponding to the physical cell identifier, SS_block_idx represents the synchronization signal block time index, a, b, c, and d each are a non-zero integer, and a, b, c, and d meet at least one of the following constraint conditions: (d*SS_block_idxmax)mod c≤c−b*Ncell,maxID; dmod c≤└c/SS_block_idxmax┘, where wherein d=a*b, SS_block_idxmax is a maximum value in SS_block_idx, Ncell,maxID is a maximum value in NcellID, mod represents a modulo operation, and └ ┘ represents a rounding down operation. ### Claim 2 (depends on 1) The method according to claim 1, further comprising: sending the reference signal on the N subcarriers. ### Claim 3 (depends on 1) The method according to claim 1, further comprising: obtaining the physical cell identifier and the first timing information via an initialized value of the reference signal sequence or a cyclic shift value of the reference signal sequence. ### Claim 4 (depends on 1) The method according to claim 1, further comprising: obtaining the first timing information via an information bit of the physical channel. ### Claim 5 (depends on 1) The method according to claim 1, wherein the first timing information further comprises half-frame indication information. ### Claim 6 (depends on 1) The method according to claim 1, wherein the reference signal sequence of the physical channel comprises a demodulation reference signal (DMRS) sequence of the physical channel. ### Claim 7 (depends on 1) The method according to claim 1, wherein the physical channel comprises a physical broadcast channel. ### Claim 8 (depends on 1) The method according to claim 1, wherein a carrier frequency band of the N subcarriers is less than or equal to 3 GHz. ### Claim 9 A signal processing method, comprising: obtaining, by a communications device, a reference signal of a physical channel, wherein a reference signal sequence corresponding to the reference signal is a gold sequence generated in accordance with a first m-sequence and a second m-sequence; and obtaining a physical cell identifier and first timing information in accordance with the reference signal sequence, wherein the first timing information comprises at least a first part of a synchronization signal block time index; and wherein a cyclic shift value m0 of the first m-sequence meets: m0=((NcellID+a*SS_block_idx)*b)mod c; or m0=(b*NcellID+d*SS_block_idx)mod c, where wherein NcellID represents an identifier corresponding to the physical cell identifier, SS_block_idx represents the synchronization signal block time index, a, b, c, and d each are a non-zero integer, and a, b, c, and d meet at least one of the following constraint conditions: (d*SS_block_idxmax)mod c≤c−b*Ncell,maxID; dmod c≤└c/SS_block_idxmax┘, where wherein d=a*b, SS_block_idxmax is a maximum value in SS_block_idx, Ncell,maxID is a maximum value in NcellID, mod represents a modulo operation, and └ ┘ represents a rounding down operation. ### Claim 10 (depends on 9) The method according to claim 9, further comprising: receiving the reference signal on N subcarriers, wherein N is a positive integer greater than or equal to 1. ### Claim 11 (depends on 10) The method according to claim 10, wherein a carrier frequency band of the N subcarriers is less than or equal to 3 GHz. ### Claim 12 (depends on 9) The method according to claim 9, wherein obtaining the physical cell identifier and the first timing information in accordance with the reference signal sequence comprises obtaining the physical cell identifier and the first timing information in accordance with an initialized value of the reference signal sequence or a cyclic shift value of the reference signal sequence. ### Claim 13 (depends on 9) The method according to claim 9, wherein the first timing information further comprises half-frame indication information. ### Claim 14 (depends on 9) The method according to claim 9, wherein the reference signal sequence comprises a demodulation reference signal (DMRS) sequence of the physical channel. ### Claim 15 (depends on 9) The method according to claim 9, wherein obtaining the physical cell identifier and the first timing information in accordance with the reference signal sequence comprises obtaining the first timing information via an information bit of the physical channel. ### Claim 16 (depends on 9) The method according to claim 9, wherein the physical channel comprises a physical broadcast channel. ### Claim 17 A communications apparatus, comprising: a processor; and a non-transitory computer-readable storage medium storing a program to be executed by the processor, the program including instructions for: generating a reference signal sequence of a physical channel in accordance with a first m-sequence and a second m-sequence, wherein the reference signal sequence is a gold sequence, the reference signal sequence is related to a physical cell identifier and first timing information, and the first timing information comprises at least a first part of a synchronization signal block time index; modulating the generated reference signal sequence; and in response to modulating the generated reference signal sequence, mapping a modulated reference signal sequence to N subcarriers to obtain a reference signal, wherein N is a positive integer greater than or equal to 1; and wherein a cyclic shift value m0 of the first m-sequence meets: m0=((NcellID+a*SS_block_idx)*b)mod c; or m0=(b*NcellID+d*SS_block_idx)mod c, where wherein NcellID represents an identifier corresponding to the physical cell identifier, SS_block_idx represents the synchronization signal block time index, a, b, c, and d each are a non-zero integer, and a, b, c, and d meet at least one of the following constraint conditions: (d*SS_block_idxmax)mod c≤c−b*Ncell,maxID; dmod c≤└c/SS_block_idxmax┘, where wherein d=a*b, SS_block_idxmax is a maximum value in SS_block_idx, Ncell,maxID is a maximum value in NcellID, mod represents a modulo operation, and └ ┘ represents a rounding down operation. ### Claim 18 (depends on 17) The communications apparatus according to claim 17, further comprising: a transmitter, configured to send the reference signal on the N subcarriers. ### Claim 19 (depends on 17) The communications apparatus according to claim 17, wherein the instructions comprise further instructions for obtaining the physical cell identifier and the first timing information via an initialized value of the reference signal sequence or a cyclic shift value of the reference signal sequence. ### Claim 20 (depends on 17) The communications apparatus according to claim 17, wherein the instructions comprise further instructions for obtaining the first timing information via an information bit of the physical channel. ### Claim 21 (depends on 17) The communications apparatus according to claim 17, wherein the first timing information further comprises half-frame indication information. ### Claim 22 (depends on 17) The communications apparatus according to claim 17, wherein the reference signal sequence comprises a demodulation reference signal (DMRS) sequence of the physical channel. ### Claim 23 (depends on 17) The communications apparatus according to claim 17, wherein the physical channel comprises a physical broadcast channel. ### Claim 24 (depends on 17) The communications apparatus according to claim 17, wherein a frequency band of the N subcarriers is less than or equal to 3 GHz. ### Claim 25 A communications apparatus, comprising: a processor; a receiver, configured to obtain a reference signal of a physical channel, wherein a reference signal sequence corresponding to the reference signal is a gold sequence generated in accordance with a first m-sequence and a second m-sequence; and a non-transitory computer-readable storage medium storing a program to be executed by the processor, the program including instructions for obtaining a physical cell identifier and first timing information in accordance with the reference signal sequence, wherein the first timing information comprises at least a first part of a synchronization signal block time index; and wherein a cyclic shift value m0 of the first m-sequence meets: m0=((NcellID+a*SS_block_idx)*b)mod c; or m0=(b*NcellID+d*SS_block_idx)mod c, where wherein NcellID represents an identifier corresponding to the physical cell identifier, SS_block_idx represents the synchronization signal block time index, a, b, c, and d each are a non-zero integer, and a, b, c, and d meet at least one of the following constraint conditions: (d*SS_block_idxmax)mod c≤c−b*Ncell,maxID; dmod c≤└c/SS_block_idxmax┘, where wherein d=a*b, SS_block_idxmax is a maximum value in SS_block_idx, Ncell,maxID is a maximum value in NcellID, mod represents a modulo operation, and └ ┘ represents a rounding down operation. ### Claim 26 (depends on 25) The communications apparatus according to claim 25, wherein the receiver is further configured to: receive the reference signal on N subcarriers, wherein N is a positive integer greater than or equal to 1. ### Claim 27 (depends on 26) The communications apparatus according to claim 26, wherein a carrier frequency band of the N subcarriers is less than or equal to 3 GHz. ### Claim 28 (depends on 25) The communications apparatus according to claim 25, wherein the instructions comprise further instructions for obtaining the physical cell identifier and the first timing information via an initialized value of the reference signal sequence or a cyclic shift value of the reference signal sequence. ### Claim 29 (depends on 25) The communications apparatus according to claim 25, wherein the instructions comprise further instructions for obtaining the first timing information via an information bit of the physical channel. ### Claim 30 (depends on 25) The communications apparatus according to claim 25, wherein the first timing information further comprises half-frame indication information. ### Claim 31 (depends on 25) The communications apparatus according to claim 25, wherein the reference signal sequence comprises a demodulation reference signal (DMRS) sequence of the physical channel. ### Claim 32 (depends on 25) The communications apparatus according to claim 25, wherein the physical channel comprises a physical broadcast channel.