Chirp-Filtered Integrated Downlink Signals for Accurate Delay Sensing
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately estimating round-trip delay due to transmission and reception timing errors, which are exacerbated by limited bandwidth and increased power consumption, particularly in high-frequency bands, leading to constraints in analog beamforming and multi-user scheduling.
Innovation Solution
A method and apparatus for transmitting and receiving a downlink channel and signal integrated with sensing, utilizing chirp filtering sequences and frequency shift keying modulation to enhance round-trip delay estimation accuracy within limited bandwidth, enabling high-resolution delay-domain channel acquisition and reducing terminal power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wider frequency bandwidth is allocated for reference signals to improve round-trip delay estimation accuracy, then estimation accuracy is improved, but power consumption increases and analog beamforming constraints are exacerbated
Solution Approach 1:
The patent combines downlink communication signals with sensing reference signals into a single integrated signal transmission. The base station transmits both communication data and sensing reference signals simultaneously on the same time-frequency resources, allowing the terminal to perform round-trip delay estimation using the reflected sensing signals without requiring additional dedicated bandwidth or increasing power consumption separately for sensing operations.
Solution Approach 2:
The downlink channel and signal serve dual functions: communication and sensing. The integrated signal structure enables the same transmission to provide both data communication and round-trip delay estimation capabilities, eliminating the need for separate dedicated sensing signals and thereby reducing overall power consumption requirements.
2Measurement precision
If wider frequency bandwidth is allocated for reference signals to improve round-trip delay estimation accuracy, then estimation accuracy is improved, but constraints in analog beamforming and multi-user scheduling occur
Solution Approach 1:
By merging communication and sensing functions into a single integrated signal transmission, the patent eliminates the need for separate beamforming operations for sensing. The same beamforming configuration used for communication data transmission is simultaneously utilized for sensing reference signals, thereby maintaining analog beamforming capability without additional constraints.
3Measurement precision
If dedicated sensing signals are transmitted separately from communication signals, then sensing accuracy is improved, but time and frequency resources are wasted
Solution Approach 1:
The patent integrates sensing reference signals with communication data signals in the same time-frequency resources. The base station transmits both types of signals simultaneously, and the terminal processes both communication data and sensing information from the same received signal, thereby achieving high sensing accuracy without wasting additional time and frequency resources.
Solution Approach 2:
The transmitted signal serves multiple purposes simultaneously: it carries communication data and embedded sensing reference signals. This multi-functional approach allows the system to achieve both communication productivity and sensing accuracy without requiring separate dedicated sensing transmission time slots or frequency bands.
Data Source
AI summary
A method of a base station may comprise: generating control information for a sensing-integrated downlink channel and signal based on terminal capability information received from a terminal; generating the sensing-integrated downlink channel and signal based on the control information and transmitting the sensing-integrated downlink channel and signal to the terminal; receiving a reflected sensing-integrated downlink channel and signal for the sensing-integrated downlink channel and signal from the terminal; and determining a round-trip delay for the sensing-integrated downlink channel and signal based on the reflected sensing-integrated downlink channel and signal.