# US 2021/0243703 A1 · Ssb channel cancelation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0243703 A1 - Document ID: US20210243703A1 - Status: Published application - Kind: A1 - Application number: 16/779,075 - Filed: 2020-01-31 - Published: 2021-08-05 - Earliest claimed: 2020-01-31 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Guy WOLF; Sharon LEVY; Igor GUTMAN; Yehonatan DALLAL - Web page: https://patentgrep.com/patent/US20210243703A1 ## CPC - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04W 56/001: {Synchronization between nodes} - H04B 7/01: Reducing phase shift - H04J 11/005: {of intercell interference} - H04J 11/0073: {Acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group} - H04J 11/0076: {Acquisition of secondary synchronisation channel, e.g. detection of cell-ID group} - H04J 11/0093: {Neighbour cell search} - H04L 1/0038: {Blind format detection (for detection of modulation format H04L27/0012)} - H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04L 27/2657: {Carrier synchronisation} - H04L 27/2666: {Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length} - H04W 72/30: Resource management for broadcast services - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION - 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) ## Abstract A synchronization signal block (SSB) transmitted by a neighbor base station may interfere with a physical downlink shared channel (PDSCH) transmitted by a serving base station. A user equipment (UE) that receives both the SSB and PDSCH may mitigate the interference to improve an error rate of decoding the PDSCH. The UE may receive a first SSB including a first broadcast channel (BCH) from a second base station other than a serving base station. The UE may decode the first SSB. The UE may determine, based on the first SSB and the first BCH, that the PDSCH scheduled by the serving base station will overlap with a second SSB from the second base station. The UE may estimate a channel of the second SSB based on the decoded first SSB. The UE may remove a reconstructed second SSB from the PDSCH. The UE may decode the PDSCH. ## Claims ### Claim 1 A method of wireless communication, comprising: receiving a first synchronization signal block (SSB) including a first broadcast channel (BCH) from a second base station other than a serving base station; decoding the first SSB; determining, based on the first SSB and the first BCH, that a physical downlink shared channel (PDSCH) scheduled by the serving base station will overlap with a second SSB from the second base station; estimating a channel of the second SSB based on the decoded first SSB; reconstructing the second SSB based on the estimated channel; removing the reconstructed second SSB from the PDSCH; and decoding the PDSCH. ### Claim 2 (depends on 1) The method of claim 1, wherein decoding the first SSB includes determining a primary synchronization sequence, a secondary synchronization sequence, data bits of the first BCH, and time and frequency offsets. ### Claim 3 (depends on 1) The method of claim 1, wherein estimating the channel of the second SSB based on the decoded first SSB comprises predicting data bits of a second BCH of the second SSB. ### Claim 4 (depends on 1) The method of claim 1, wherein estimating the channel of the second SSB based on the decoded first SSB comprises using decoded symbols of the first SSB as pilot symbols. ### Claim 5 (depends on 1) The method of claim 1, further comprising iteratively removing the PDSCH from the second SSB. ### Claim 6 (depends on 5) The method of claim 5, wherein iteratively removing the PDSCH from the second SSB comprises determining a noise covariance matrix based on an estimation of a channel of the PDSCH, and determining a change in the noise covariance matrix for subsequent iterations. ### Claim 7 (depends on 1) The method of claim 1, further comprising: decoding a second BCH of the second SSB; and determining whether the second SSB including the second BCH, a primary synchronization signal and a secondary synchronization signal is equivalent to the first SSB, wherein estimating the channel of the second SSB is based on the first SSB when the first SSB is equivalent to the second SSB. ### Claim 8 (depends on 1) The method of claim 1, wherein estimating the channel of the second SSB based on the decoded first SSB comprises updating a BCH power delay profile (PDP) and Doppler and frequency offset tracking loops based on the first SSB. ### Claim 9 (depends on 1) The method of claim 1, wherein the first SSB does not overlap with any PDSCH scheduled by the serving base station. ### Claim 10 (depends on 1) The method of claim 1, wherein receiving the first SSB comprises blindly detecting the first SSB or receiving the first SSB based on information about the second base station. ### Claim 11 An apparatus for wireless communication, comprising: a memory; and at least one processor coupled with the memory and configured to: receive a first synchronization signal block (SSB) including a first broadcast channel (BCH) from a second base station other than a serving base station; decode the first SSB; determine, based on the first SSB and the first BCH, that a physical downlink shared channel (PDSCH) scheduled by the serving base station will overlap with a second SSB from the second base station; estimate a channel of the second SSB based on the decoded first SSB; reconstruct the second SSB based on the estimated channel; remove the reconstructed second SSB from the PDSCH; and decode the PDSCH. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the at least one processor is configured to determine a primary synchronization sequence, a secondary synchronization sequence, data bits of the first BCH, and time and frequency offsets. ### Claim 13 (depends on 11) The apparatus of claim 11, wherein the at least one processor is configured to estimate the channel of the second SSB based on the decoded first SSB by predicting data bits of a second BCH of the second SSB. ### Claim 14 (depends on 11) The apparatus of claim 11, wherein the at least one processor is configured to estimate the channel of the second SSB based on the decoded first SSB using decoded symbols of the first SSB as pilot symbols. ### Claim 15 (depends on 11) The apparatus of claim 11, wherein the at least one processor is configured to iteratively remove the PDSCH from the second SSB. ### Claim 16 (depends on 15) The apparatus of claim 15, wherein the at least one processor is configured to determine a noise covariance matrix based on an estimation of a channel of the PDSCH, and determine a change in the noise covariance matrix for subsequent iterations. ### Claim 17 (depends on 11) The apparatus of claim 11, wherein the at least one processor is configured to: decode a second BCH of the second SSB; and determine whether the second SSB including the second BCH, a primary synchronization signal and a secondary synchronization signal is equivalent to the first SSB, wherein estimating the channel of the second SSB is based on the first SSB when the first SSB is equivalent to the second SSB. ### Claim 18 (depends on 11) The apparatus of claim 11, wherein the at least one processor is configured to estimate the channel of the second SSB based on the decoded first SSB by updating a BCH power delay profile (PDP) and Doppler and frequency offset tracking loops based on the first SSB. ### Claim 19 (depends on 11) The apparatus of claim 11, wherein the first SSB does not overlap with any PDSCH scheduled by the serving base station. ### Claim 20 (depends on 11) The apparatus of claim 11, wherein the at least one processor is configured to blindly detect the first SSB or receive the first SSB based on information about the second base station. ### Claim 21 An apparatus for wireless communication, comprising: means for receiving a first synchronization signal block (SSB) including a first broadcast channel (BCH) from a second base station other than a serving base station; means for decoding the first SSB; means for determining, based on the first SSB and the first BCH, that a physical downlink shared channel (PDSCH) scheduled by the serving base station will overlap with a second SSB from the second base station; means for estimating a channel of the second SSB based on the decoded first SSB; means for reconstructing the second SSB based on the estimated channel; and means for removing the reconstructed second SSB from the PDSCH, wherein the means for decoding are configured to decode the PDSCH. ### Claim 22 (depends on 21) The apparatus of claim 21, wherein the means for decoding is configured to determine a primary synchronization sequence, a secondary synchronization sequence, data bits of the first BCH, and time and frequency offsets. ### Claim 23 (depends on 21) The apparatus of claim 21, wherein the means for estimating the channel of the second SSB based on the decoded first SSB is configured to predict data bits of a second BCH of the second SSB. ### Claim 24 (depends on 21) The apparatus of claim 21, wherein the means for estimating the channel of the second SSB based on the decoded first SSB is configured to use decoded symbols of the first SSB as pilot symbols. ### Claim 25 (depends on 21) The apparatus of claim 21, wherein the means for removing is configured to remove the PDSCH from the second SSB. ### Claim 26 (depends on 25) The apparatus of claim 25, wherein the means for removing is configured to determine a noise covariance matrix based on an estimation of a channel of the PDSCH, and determine a change in the noise covariance matrix for subsequent iterations. ### Claim 27 (depends on 21) The apparatus of claim 21, wherein the means for decoding is configured to decode a second BCH of the second SSB and determine whether the second SSB including the second BCH, a primary synchronization signal and a secondary synchronization signal is equivalent to the first SSB, wherein estimating the channel of the second SSB is based on the first SSB when the first SSB is equivalent to the second SSB. ### Claim 28 (depends on 21) The apparatus of claim 21, wherein the means for estimating the channel of the second SSB based on the decoded first SSB is configured to update a BCH power delay profile (PDP) and Doppler and frequency offset tracking loops based on the first SSB. ### Claim 29 (depends on 21) The apparatus of claim 21, wherein the first SSB does not overlap with any PDSCH scheduled by the serving base station. ### Claim 30 A non-transitory computer-readable medium storing computer executable code, the code when executed by a processor cause the processor to: receive a first synchronization signal block (SSB) including a first broadcast channel (BCH) from a second base station other than a serving base station; decode the first SSB; determine, based on the first SSB and the first BCH, that a physical downlink shared channel (PDSCH) scheduled by the serving base station will overlap with a second SSB from the second base station; estimate a channel of the second SSB based on the decoded first SSB; reconstruct the second SSB based on the estimated channel; remove the reconstructed second SSB from the PDSCH; and decode the PDSCH.