Uplink Reference Signal Configuration for Full Duplex Interference
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Solution Overview
Problem
In full duplex communication between a base station and terminals, uplink signals from one terminal cause interference to downlink signals of another terminal, which existing methods cannot effectively eliminate due to the inability of the second terminal to measure the uplink signal sent by the first terminal.
Innovation Solution
The base station sends configuration information for both uplink and downlink reference signals to the terminals, allowing the second terminal to measure both the downlink signal from the base station and the uplink signal from the first terminal, enabling coordinated scheduling to mitigate interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station uses full duplex technology to simultaneously send downlink data and receive uplink data, then spectral efficiency is improved, but uplink signals from one terminal cause interference to downlink signals of another terminal
Solution Approach 1:
The patent implements a feedback mechanism where the second terminal measures the uplink reference signal from the first terminal and reports the measurement result (interference level) to the base station. The base station uses this feedback to adjust scheduling decisions, thereby resolving the interference problem while maintaining full duplex operation
Solution Approach 2:
The patent replaces traditional interference avoidance methods (time-division or frequency-division multiplexing) with a measurement and reporting mechanism. Instead of preventing uplink-downlink simultaneous transmission through mechanical scheduling constraints, the system uses reference signal measurement and interference reporting to dynamically manage interference
2Object-affected harmful factors
If the terminal uses half duplex to avoid self-interference, then interference between terminals is reduced, but communication efficiency decreases due to inability to send and receive data simultaneously
Solution Approach 1:
The patent enables the base station to receive interference measurement feedback from the second terminal regarding the uplink signal from the first terminal. This feedback allows the base station to make informed scheduling decisions that can maintain full duplex operation while managing interference, thereby avoiding the efficiency loss of half duplex
3Device complexity
If the second terminal only measures downlink reference signals, then measurement complexity is reduced, but the base station cannot determine interference from uplink signals to downlink signals
Solution Approach 1:
The patent makes the reference signal configuration universal by allowing the same reference signal (originally intended for uplink channel sounding) to serve dual purposes: the base station uses it for uplink channel estimation, and the second terminal uses it for measuring interference from the first terminal's uplink transmission
Solution Approach 2:
The patent introduces the uplink reference signal as an intermediary that enables the second terminal to measure interference without requiring a separate dedicated measurement signal. The reference signal acts as a mediator that carries information about both the uplink channel and the interference level
Data Source
AI summary
A reference signal transmission method and apparatus are provided. The method includes: receiving, by a first terminal, uplink reference signal configuration information from a base station, wherein the uplink reference signal configuration information comprises configuration information of a first-type reference signal and configuration information of a second-type reference signal that the first terminal needs to send; and sending, by the first terminal, a first-type reference signal and a second-type reference signal to the base station based on the uplink reference signal configuration information. The method can be applied for V2X (vehicle to X), and/or, sidelink transmission, and/or, D2D (device to device) communication.