US-20260128806-A1 - WIRELESS SENSING METHOD AND APPARATUS

US20260128806A1US 20260128806 A1US20260128806 A1US 20260128806A1US-20260128806-A1

Abstract

A wireless sensing method and an apparatus are disclosed. An example method includes: generating at least two sensing signal flows, where the at least two sensing signal flows include a first sensing signal flow and a second sensing signal flow, the first sensing signal flow is a random signal flow, and the second sensing signal flow is determined based on the first sensing signal flow and a lowpass function; and outputting the at least two sensing signal flows in each of a plurality of time units.

Inventors

Li Sun
Yuwei WANG
Peng Liu
Wenhui Wang

Assignees

HUAWEI TECHNOLOGIES CO., LTD.

Dates

Publication Date: 20260507
Application Date: 20251219

Claims (20)

1 . A wireless sensing method, comprising: generating at least two sensing signal flows, wherein the at least two sensing signal flows comprise a first sensing signal flow and a second sensing signal flow, the first sensing signal flow is a random signal flow, and the second sensing signal flow is determined based on the first sensing signal flow and a lowpass function; and outputting the at least two sensing signal flows in each of a plurality of time units.
2 . The method according to claim 1 , wherein a modulus of the first sensing signal flow remains unchanged, and a phase changes with the time unit.
3 . The method according to claim 1 , wherein the first sensing signal flow is a random scalar whose modulus is any positive number and whose phase is evenly distributed from 0 to 2π.
4 . The method according to claim 1 , wherein the first sensing signal flow is a point in a modulation constellation set.
5 . The method according to 1 , wherein a phase of the second sensing signal flow is determined based on a sampling value of the lowpass function in a time unit for sending a sensing signal flow, and a modulus of the second sensing signal flow is equal to the modulus of the first sensing signal flow.
6 . The method according claim 1 , wherein the second sensing signal flow and the first sensing signal flow satisfy the following relationship: X 2 [ k ] X 1 [ k ] = e j ⁢ ρ , wherein X 1 [k] indicates a signal of the first sensing signal flow on a k th subcarrier, X 2 [k] indicates a signal of the second sensing signal flow on the k th subcarrier, ρ indicates the sampling value of the lowpass function in the time unit for sending the sensing signal flow, and k is a positive integer.
7 . A wireless sensing method, comprising: receiving at least two sensing signal flows in each of a plurality of time units, wherein the at least two sensing signal flows comprise a signal of a first sensing signal flow after channel transmission and a signal of a second sensing signal flow after channel transmission, the first sensing signal flow is a random signal flow, and the second sensing signal flow is determined based on the first sensing signal flow and a lowpass function; and processing the at least two sensing signal flows received in the plurality of time units, to determine a wireless sensing result.
8 . The method according to claim 7 , wherein a modulus of the first sensing signal flow remains unchanged, and a phase changes with the time unit.
9 . The method according to claim 7 , wherein the first sensing signal flow is a random scalar whose modulus is any positive number and whose phase is evenly distributed from 0 to 2π.
10 . The method according to claim 7 , wherein the first sensing signal flow is a point in a modulation constellation set.
11 . The method according to claim 7 , wherein a phase of the second sensing signal flow is determined based on a sampling value of the lowpass function in a time unit for sending a sensing signal flow, and a modulus of the second sensing signal flow is equal to the modulus of the first sensing signal flow.
12 . The method according to claim 7 , wherein the second sensing signal flow and the first sensing signal flow satisfy the following relationship: X 2 [ k ] X 1 [ k ] = e j ⁢ ρ , wherein X 1 [k] indicates a signal of the first sensing signal flow on a k th subcarrier, X 2 [k] indicates a signal of the second sensing signal flow on the k th subcarrier, ρ indicates the sampling value of the lowpass function in the time unit for sending the sensing signal flow, and k is a positive integer.
13 . A communication apparatus comprising at least one processor coupled to at least one memory storing a computer program including instructions that, when executed by the processor, cause the communication apparatus to: generate at least two sensing signal flows, wherein the at least two sensing signal flows comprise a first sensing signal flow and a second sensing signal flow, the first sensing signal flow is a random signal flow, and the second sensing signal flow is determined based on the first sensing signal flow and a lowpass function; and output the at least two sensing signal flows in each of a plurality of time units.
14 . The communication apparatus according to claim 13 , wherein a modulus of the first sensing signal flow remains unchanged, and a phase changes with the time unit.
15 . The communication apparatus according to claim 13 , wherein a phase of the second sensing signal flow is determined based on a sampling value of the lowpass function in a time unit for sending a sensing signal flow, and a modulus of the second sensing signal flow is equal to the modulus of the first sensing signal flow.
16 . The communication apparatus according to claim 13 , wherein the second sensing signal flow and the first sensing signal flow satisfy the following relationship: X 2 [ k ] X 1 [ k ] = e j ⁢ ρ , wherein X 1 [k] indicates a signal of the first sensing signal flow on a k th subcarrier, X 2 [k] indicates a signal of the second sensing signal flow on the k th subcarrier, ρ indicates the sampling value of the lowpass function in the time unit for sending the sensing signal flow, and k is a positive integer.
17 . A communication apparatus comprising at least one processor coupled to at least one memory storing a computer program including instructions that, when executed by the processor, cause the communication apparatus to: receive at least two sensing signal flows in each of a plurality of time units, wherein the at least two sensing signal flows comprise a signal of a first sensing signal flow after channel transmission and a signal of a second sensing signal flow after channel transmission, the first sensing signal flow is a random signal flow, and the second sensing signal flow is determined based on the first sensing signal flow and a lowpass function; and process the at least two sensing signal flows received in the plurality of time units, to determine a wireless sensing result.
18 . The communication apparatus according to claim 17 , wherein a modulus of the first sensing signal flow remains unchanged, and a phase changes with the time unit.
19 . The communication apparatus according to claim 17 , wherein a phase of the second sensing signal flow is determined based on a sampling value of the lowpass function in a time unit for sending a sensing signal flow, and a modulus of the second sensing signal flow is equal to the modulus of the first sensing signal flow.
20 . The communication apparatus according to claim 17 , wherein the second sensing signal flow and the first sensing signal flow satisfy the following relationship: X 2 [ k ] X 1 [ k ] = e j ⁢ ρ , wherein X 1 [k] indicates a signal of the first sensing signal flow on a k th subcarrier, X 2 [k] indicates a signal of the second sensing signal flow on the k th subcarrier, ρ indicates the sampling value of the lowpass function in the time unit for sending the sensing signal flow, and k is a positive integer.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of International Application No. PCT/CN2023/101544, filed on Jun. 20, 2023, the disclosure of which is hereby incorporated by reference in its entirety. TECHNICAL FIELD This application relates to the communication field, and more specifically, to a wireless sensing method and an apparatus. BACKGROUND Sensing is one of important applications of a 6th generation (6G) mobile communication technology and next-generation wireless connectivity (Wi-Fi). The fundamental principle of sensing is to use radio signals to measure channels, to obtain channel state information (CSI) or a channel impulse response (CIR), thereby inferring information related to the environment or a sensed object (for example, a person or an object in the environment) based on the channel state information or the channel impulse response. Special “measurement” signals (such as pilots) in wireless systems can be used for sensing, but such signals have a publicly known signal structure, which may lead to privacy exposure. Unauthorized users could potentially eavesdrop the aforementioned measurement signals, and infer positions, trajectories, behavior features, and the like of authorized users. This results in privacy leakage. Therefore, how to protect user privacy while ensuring sensing performance is an urgent problem to be resolved currently. SUMMARY Embodiments of this application provide a wireless sensing method and an apparatus, to protect user privacy while ensuring sensing performance. To achieve the foregoing objective, the following technical solutions are used in this application. According to a first aspect, a wireless sensing method is provided. The method may be performed by a first node, or may be performed by a component of the first node, for example, a processor, a chip, or a chip system of the first node, or may be implemented by a logic module or software that can implement all or a part of functions of the first node. For example, the method may be performed by a first node. The method includes: generating at least two sensing signal flows, where the at least two sensing signal flows include a first sensing signal flow and a second sensing signal flow, the first sensing signal flow is a random signal flow, and the second sensing signal flow is determined based on the first sensing signal flow and a lowpass function; and outputting the at least two sensing signal flows in each of a plurality of time units. In this embodiment of this application, the first node may output the at least two sensing signal flows in each of the plurality of time units. The first sensing signal flow is the random signal flow, and the second sensing signal flow is determined based on the first sensing signal flow and the lowpass function. In this way, a second node may determine a wireless sensing result based on a received signal. In one aspect, because of a lowpass feature of the lowpass function, unauthorized users cannot determine the wireless sensing result. This protects privacy of authorized users. In another aspect, in this embodiment of this application, only a group of random numbers used to determine the lowpass function needs to be shared between the first node and the second node, so that the authorized user can determine the wireless sensing result based on the signal received by the second node. Therefore, implementation complexity is low. In conclusion, in this embodiment of this application, privacy of the authorized user can be effectively protected while sensing is ensured, and implementation complexity is low. In a possible implementation, a modulus of the first sensing signal flow remains unchanged, and a phase changes with the time unit. In this way, sensing precision can be ensured while privacy of the authorized user is protected. For example, because the modulus of the first sensing signal flow remains unchanged, and the phase changes with the time unit, channel strength may remain unchanged, and channel estimation performance may be better. In addition, a wireless sensing result is usually determined based on a channel estimation result, and a more accurate wireless sensing result may be obtained based on a better channel estimation result. Therefore, sensing precision can be ensured while privacy of the authorized user is protected. Optionally, the first sensing signal flow is a random scalar whose modulus is any positive number and whose phase is evenly distributed from 0 to 21. This implementation is flexible, so that the modulus of the first sensing signal flow remains unchanged, and the phase changes with the time unit. In this way, sensing precision can be ensured while privacy of the authorized user is protected. In a possible implementation, the first sensing signal flow is point in a modulation constellation set. In this implementation, the first sensing signal flow is selected from a finite set, and has low implementation complexity. Whe