# US 2021/0243002 A1 · Clutter interference management > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0243002 A1 - Document ID: US20210243002A1 - Status: Published application - Kind: A1 - Application number: 17/248,189 - Filed: 2021-01-13 - Published: 2021-08-05 - Earliest claimed: 2020-01-31 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Kapil GULATI; Navid ABEDINI; Andrzej PARTYKA; Vasanthan RAGHAVAN; Junyi LI; Ozge KOYMEN - Web page: https://patentgrep.com/patent/US20210243002A1 ## CPC - H04L 5/1438: {Negotiation of transmission parameters prior to communication (modified according to link quality H04L1/0001)} - H04W 56/0045: {compensating for timing error by altering transmission time} - H04L 5/14: Two-way operation using the same type of signal, i.e. duplex - H04L 5/143: {for modulated signals (H04L5/1469 takes precedence)} - H04L 5/1461: {Suppression of signals in the return path, i.e. bidirectional control circuits} - H04L 27/2646: {using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length} - H04W 56/001: {Synchronization between nodes} - 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) ## Abstract Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a base station may determine, for full-duplex mode communication on a first link and a second link, a timing adjustment to at least one of a first timing or a second timing, wherein the timing adjustment is to cause a delay between clutter reflection from a first signal and an occurrence of a second signal to occur during a cyclic prefix of the second signal; cause the timing adjustment to be applied to the at least one of the first timing or the second timing; and communicate in the full-duplex mode with a first node and a second node in accordance with the timing adjustment, wherein communicating includes transmitting the first signal to the first node and receiving the second signal from the second node. Numerous other aspects are provided. ## Claims ### Claim 1 A wireless communication device for wireless communication, comprising: a memory; and one or more processors operatively coupled to the memory, the memory and the one or more processors configured to: determine, for full-duplex mode communication on a first link and a second link, a timing adjustment to at least one of a first timing or a second timing, wherein the timing adjustment is to cause a delay between reception of a clutter reflection of a first signal and reception of a second signal to be within an adjusted cyclic prefix length of the second signal, wherein the adjusted cyclic prefix length is based at least in part on a scaling factor; cause the timing adjustment to be applied to the at least one of the first timing or the second timing; and communicate in the full-duplex mode with a first node and a second node in accordance with the timing adjustment based at least in part on causing the timing adjustment to be applied, wherein communicating includes transmitting the first signal to the first node and receiving the second signal from the second node. ### Claim 2 (depends on 1) The wireless communication device of claim 1, wherein the scaling factor is less than or equal to one. ### Claim 3 (depends on 1) The wireless communication device of claim 1, wherein the scaling factor is based at least in part on at least one of: a modulation of the second signal or a code rate of the second signal. ### Claim 4 (depends on 1) The wireless communication device of claim 1, wherein the one or more processors, when causing the timing adjustment to be applied, are configured to: adjust the first timing of the first signal. ### Claim 5 (depends on 1) The wireless communication device of claim 1, wherein the one or more processors, when causing the timing adjustment to be applied, are configured to: provide, to the second node, a timing advance command identifying the timing adjustment to cause a change to the second timing of the second signal. ### Claim 6 (depends on 1) The wireless communication device of claim 1, wherein the delay is entirely within the adjusted cyclic prefix length of the second signal. ### Claim 7 (depends on 1) The wireless communication device of claim 1, wherein the delay is at least partially within the adjusted cyclic prefix length of the second signal. ### Claim 8 (depends on 1) The wireless communication device of claim 1, wherein the one or more processors, when determining the timing adjustment, are configured to: determine the timing adjustment based at least in part on a clutter interference measurement of a reference signal or a synchronization signal block transmission to the first node. ### Claim 9 (depends on 1) The wireless communication device of claim 1, wherein the one or more processors, when determining the timing adjustment, are configured to: determine the timing adjustment based at least in part on a channel measurement of a reference signal or a synchronization signal from the second node. ### Claim 10 (depends on 1) The wireless communication device of claim 1, wherein the one or more processors, when communicating in the full-duplex mode, are configured to: communicate in the full-duplex mode based at least in part on a signal to interference noise requirement of at least one of the first link or the second link and based at least in part on a clutter interference leakage determination for the second signal. ### Claim 11 (depends on 1) The wireless communication device of claim 1, wherein the one or more processors are further configured to: report a time delay for the first node and the second node to a parent node of the wireless communication device; and receive an indication of whether to communicate in the full-duplex mode based at least in part on reporting the time delay; and wherein the one or more processors, when communicating in the full-duplex mode, are configured to: communicate in the full-duplex mode based at least in part on receiving the indication of whether to communicate in the full-duplex mode. ### Claim 12 (depends on 1) The wireless communication device of claim 1, wherein the one or more processors are further configured to: determine a first multiple access (MA) signature for the first node and a second MA signature for the second node, wherein the first MA signature and the second MA signature are selected to suppress residual clutter interference; and wherein the one or more processors, when communicating in the full-duplex mode, are configured to: communicate in the full-duplex mode with the first node using the first MA signature and with the second node using the second MA signature. ### Claim 13 A wireless communication device for wireless communication, comprising: a memory; and one or more processors operatively coupled to the memory, the memory and the one or more processors configured to: determine, for full-duplex mode communication with a first node and a second node, a first multiple access (MA) signature for the first node and a second MA signature for the second node, wherein the first MA signature and the second MA signature are selected to suppress residual clutter interference; and communicate in the full-duplex mode with the first node using the first MA signature and with the second node using the second MA signature. ### Claim 14 (depends on 13) The wireless communication device of claim 13, wherein a first demodulation reference signal (DMRS) configuration of a first signal transmitted to the first node and a second DMRS configuration of a second signal received from the second node are selected to enable separate channel estimation for the first signal and the second signal. ### Claim 15 (depends on 14) The wireless communication device of claim 14, wherein the first DMRS and the second DMRS use the same time resources, the same frequency resources, and the same base sequence, and wherein the first DMRS uses a first cyclic shift and the second DMRS uses a second cyclic shift. ### Claim 16 (depends on 14) The wireless communication device of claim 14, wherein the first DMRS and the second DMRS use the same time resources and the same frequency resources, and wherein the first DMRS uses a first base sequence and the second DMRS uses a second base sequence. ### Claim 17 (depends on 14) The wireless communication device of claim 14, wherein the first DMRS uses a first time resource and the second DMRS uses a second time resource. ### Claim 18 (depends on 14) The wireless communication device of claim 14, wherein the first DMRS uses a first frequency resource and the second DMRS uses a second frequency resource. ### Claim 19 (depends on 13) The wireless communication device of claim 13, wherein the first MA signature and the second MA signature are resource spread multiple access signatures. ### Claim 20 (depends on 13) The wireless communication device of claim 13, wherein lengths of the first MA signature and the second MA signature are selected based at least in part on at least one of: a clutter interference level, a configured maximum signal to interference noise ratio, or a configured maximum throughput on a link to the second node. ### Claim 21 (depends on 13) The wireless communication device of claim 13, wherein the one or more processors are further configured to: transmit information identifying a length of the first MA signature to the first node; and transmit information identifying a length of the second MA signature to the second node. ### Claim 22 (depends on 13) The wireless communication device of claim 13, wherein the one or more processors are further configured to: transmit information identifying a clutter interference measurement; and receive, as a response to the information identifying the clutter interference measurement, information identifying at least one of a length of the first MA signature or a length of the second MA signature. ### Claim 23 (depends on 13) The wireless communication device of claim 13, wherein the one or more processors are further configured to: determine a timing adjustment to at least one of a first timing or a second timing, wherein the timing adjustment is to cause a delay between reception of a clutter reflection of a first signal and reception of a second signal to be within an adjusted cyclic prefix length of the second signal, wherein the adjusted cyclic prefix length is based at least in part on a scaling factor; cause the timing adjustment to be applied to the at least one of the first timing or the second timing; and communicate in the full-duplex mode with the first node and the second node in accordance with the timing adjustment based at least in part on causing the timing adjustment to be applied, wherein communicating includes transmitting the first signal to the first node and receiving the second signal from the second node. ### Claim 24 A method of wireless communication performed by a wireless communication device, comprising: determining, for full-duplex mode communication on a first link and a second link, a timing adjustment to at least one of a first timing or a second timing, wherein the timing adjustment is to cause a delay between reception of a clutter reflection of a first signal and reception of a second signal to be within an adjusted cyclic prefix length of the second signal, wherein the adjusted cyclic prefix length is based at least in part on a scaling factor; causing the timing adjustment to be applied to the at least one of the first timing or the second timing; and communicating in the full-duplex mode with a first node and a second node in accordance with the timing adjustment based at least in part on causing the timing adjustment to be applied, wherein communicating includes transmitting the first signal to the first node and receiving the second signal from the second node. ### Claim 25 (depends on 24) The method of claim 24, wherein the scaling factor is less than or equal to one. ### Claim 26 (depends on 24) The method of claim 24, wherein the scaling factor is based at least in part on at least one of: a modulation of the second signal or a code rate of the second signal. ### Claim 27 (depends on 24) The method of claim 24, wherein causing the timing adjustment to be applied comprises: adjusting the first timing of the first signal. ### Claim 28 A method of wireless communication performed by a wireless communication device, comprising: determining, for full-duplex mode communication with a first node and a second node, a first multiple access (MA) signature for the first node and a second MA signature for the second node, wherein the first MA signature and the second MA signature are selected to suppress residual clutter interference; and communicating in the full-duplex mode with the first node using the first MA signature and with the second node using the second MA signature. ### Claim 29 (depends on 28) The method of claim 28, wherein a first demodulation reference signal (DMRS) configuration of a first signal transmitted to the first node and a second DMRS configuration of a second signal received from the second node are selected to enable separate channel estimation for the first signal and the second signal. ### Claim 30 (depends on 29) The method of claim 29, wherein the first DMRS and the second DMRS use the same time resources, the same frequency resources, and the same base sequence, and wherein the first DMRS uses a first cyclic shift and the second DMRS uses a second cyclic shift.