# US 2023/0058030 A1 · Signal sending 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 2023/0058030 A1 - Document ID: US20230058030A1 - Status: Published application - Kind: A1 - Application number: 17/970,220 - Filed: 2022-10-20 - Published: 2023-02-23 - Earliest claimed: 2020-04-22 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Jie SHENG; Gongzheng ZHANG - Web page: https://patentgrep.com/patent/US20230058030A1 ## CPC - H04L 27/2607: {Cyclic extensions} - H04J 11/0023: {Interference mitigation or co-ordination (direct sequence spread spectrum [DSSS] systems H04B1/7097; frequency hopping H04B1/713; allocation criteria for ingress interference avoidance H04L5/0062; frequency allocation criteria for requirements on out-of-channel emissions H04L5/0066; arrangements for removing intersymbol interference or baseband equalisers H04L25/03006; peak power aspects in multicarrier modulation H04L27/2614; power management H04W52/00; traffic scheduling H04W72/54, H04W72/541)} - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/0092: {Indication of how the channel is divided} - H04L 27/2666: {Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length} - H04W 72/54: based on quality criteria - 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 The present disclosure relates to signal sending methods and apparatuses. In one example method, after obtaining, at a first moment, first configuration information that includes information about a first orthogonal frequency division multiplexing (OFDM) cyclic suffix length, a terminal obtains the first OFDM cyclic suffix length from the first configuration information, and communicates with a network device at a second moment after the first moment by using the first OFDM cyclic suffix length. ## Claims ### Claim 1 A signal sending method, comprising: obtaining, by a terminal, first configuration information at a first moment, wherein the first configuration information comprises information about a first orthogonal frequency division multiplexing (OFDM) cyclic suffix length; determining, by the terminal, the first OFDM cyclic suffix length based on the first configuration information; and communicating, by the terminal, with a network device at a second moment by using the first OFDM cyclic suffix length, wherein the second moment is a moment after the first moment. ### Claim 2 (depends on 1) The method according to claim 1, wherein the terminal communicates with the network device before the second moment by using a second OFDM cyclic suffix length. ### Claim 3 (depends on 2) The method according to claim 2, wherein the second OFDM cyclic suffix length is a default configured OFDM cyclic suffix length. ### Claim 4 (depends on 1) The method according to claim 1, wherein: the first OFDM cyclic suffix length is determined based on one or more of an inter-user cross-link interference power, a user self-interference power, or timing advance within coverage of the network device; and the timing advance within coverage of the network device comprises at least one of timing advance of a cross-link interference signal relative to an expected signal or timing advance of a self-interference signal relative to an expected signal. ### Claim 5 (depends on 4) The method according to claim 4, wherein the method further comprises: receiving, by the terminal, a cross-link interference measurement message delivered by the network device; determining, by the terminal, at least one of an inter-user transmission latency or the inter-user cross-link interference power; determining the timing advance within coverage of the network device based on the inter-user transmission latency, wherein the inter-user transmission latency is a transmission latency between the terminal and another terminal in a network, and the inter-user cross-link interference power is a power of interference caused by the another terminal in the network to the terminal; and feeding back, by the terminal, at least one of the inter-user cross-link interference power or the inter-user transmission latency to the network device. ### Claim 6 (depends on 4) The method according to claim 4, wherein the method further comprises: determining, by the terminal, the user self-interference power, and feeding back the user self-interference power to the network device. ### Claim 7 (depends on 1) The method according to claim 1, wherein the communicating, by the terminal, with a network device at a second moment by using the first OFDM cyclic suffix length comprises: when the terminal communicates with the network device, adding a cyclic suffix that meets the first OFDM cyclic suffix length to each OFDM symbol; or when the terminal communicates with the network device, adding cyclic suffixes that meet the first OFDM cyclic suffix length to some OFDM symbols. ### Claim 8 A signal sending method, comprising: determining, by a network device, a first orthogonal frequency division multiplexing (OFDM) cyclic suffix length; delivering, by the network device, first configuration information at a first moment, wherein the first configuration information comprises information about the first OFDM cyclic suffix length; and communicating, by the network device, with a terminal at a second moment by using the first OFDM cyclic suffix length. ### Claim 9 (depends on 8) The method according to claim 8, wherein the network device communicates with the terminal device before the second moment by using a second OFDM cyclic suffix length. ### Claim 10 (depends on 9) The method according to claim 9, wherein the second OFDM cyclic suffix length is a default configured OFDM cyclic suffix length. ### Claim 11 (depends on 8) The method according to claim 8, wherein the determining, by a network device, a first OFDM cyclic suffix length comprises: when the terminal accesses the network device for an initial time, determining, by the network device, the first OFDM cyclic suffix length; or determining, by the network device, the first OFDM cyclic suffix length when an update trigger condition is met. ### Claim 12 (depends on 8) The method according to claim 8, wherein the determining, by a network device, a first OFDM cyclic suffix length comprises: determining, by the network device, the first OFDM cyclic suffix length based on one or more of an inter-user cross-link interference power, a user self-interference power, or timing advance within coverage, wherein the timing advance within coverage comprises at least one of timing advance of a cross-link interference signal relative to an expected signal or timing advance of a self-interference signal relative to an expected signal. ### Claim 13 (depends on 12) The method according to claim 12, wherein the method further comprises: delivering, by the network device, a cross-link interference measurement message to the terminal, wherein the cross-link interference measurement message is used to obtain an inter-user transmission latency and the inter-user cross-link interference power, and the inter-user transmission latency is used to determine the timing advance within coverage. ### Claim 14 (depends on 12) The method according to claim 12, wherein the method further comprises: determining, by the network device, an inter-user transmission latency based on location information of the terminal, wherein the inter-user transmission latency is used to determine the timing advance within coverage; and determining the inter-user cross-link interference power based on an uplink transmit power of the terminal. ### Claim 15 (depends on 12) The method according to claim 12, wherein the method further comprises: obtaining, by the network device, the user self-interference power from the terminal, or determining the user self-interference power based on a self-interference cancellation capability of the terminal. ### Claim 16 A communications apparatus, comprising at least one processor, wherein the at least one processor is coupled to a memory storing a computer program or instructions which, when executed by the at least one processor, cause the communication apparatus to: obtain first configuration information at a first moment, wherein the first configuration information comprises information about a first orthogonal frequency division multiplexing (OFDM) cyclic suffix length; determine the first OFDM cyclic suffix length based on the first configuration information; and communicate with a network device at a second moment by using the first OFDM cyclic suffix length, wherein the second moment is a moment after the first moment. ### Claim 17 (depends on 16) The communications apparatus according to claim 16, wherein the communications apparatus communicates with the network device before the second moment by using a second OFDM cyclic suffix length. ### Claim 18 (depends on 17) The communications apparatus according to claim 17, wherein the second OFDM cyclic suffix length is a default configured OFDM cyclic suffix length. ### Claim 19 (depends on 16) The communications apparatus according to claim 16, wherein: the first OFDM cyclic suffix length is determined based on one or more of an inter-user cross-link interference power, a user self-interference power, or timing advance within coverage of the network device; and the timing advance within coverage of the network device comprises at least one of timing advance of a cross-link interference signal relative to an expected signal or timing advance of a self-interference signal relative to an expected signal. ### Claim 20 (depends on 19) The communications apparatus according to claim 19, wherein the computer program or the instructions, when executed by the at least one processor, further cause the communication apparatus to: receive a cross-link interference measurement message delivered by the network device; determine at least one of an inter-user transmission latency or the inter-user cross-link interference power; determine the timing advance within coverage of the network device based on the inter-user transmission latency, wherein the inter-user transmission latency is a transmission latency between the communications apparatus and another communications apparatus in a network, and the inter-user cross-link interference power is a power of interference caused by the another communications apparatus in the network to the communications apparatus; and feedback at least one of the inter-user cross-link interference power or the inter-user transmission latency to the network device.