FDR Feedback Subframe Allocation via TDD Ratio
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Solution Overview
Problem
Current wireless access systems face inefficiencies in transmitting and receiving feedback information in Full Duplex Radio (FDR) transmission environments, where self-interference and resource allocation challenges hinder effective communication.
Innovation Solution
The method involves transmitting frame configuration information for UE-specific time division multiplexing (TDD) to determine the position of uplink subframes for feedback information, based on the ratio of downlink to uplink subframes within a radio frame, allowing efficient scheduling and reduction of self-interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If feedback information is transmitted in FDR environment using conventional methods, then communication can be maintained, but self-interference occurs and resource allocation efficiency deteriorates
Solution Approach 1:
The patent segments the radio frame into specific downlink subframes and uplink subframes based on the ratio calculation. Feedback information is transmitted only in designated uplink subframes, separating feedback transmission from general data transmission to avoid self-interference and improve resource allocation efficiency.
Solution Approach 2:
The patent dynamically determines the uplink/downlink subframe configuration based on the calculated ratio of downlink to uplink subframes. The frame structure adapts to different traffic conditions by adjusting which subframes are allocated for feedback transmission, optimizing resource allocation while minimizing self-interference.
2Device complexity
If feedback information for multiple DL subframes is transmitted at one UL subframe, then transmission overhead is reduced, but timing alignment and resource management complexity increases
Solution Approach 1:
The patent changes the parameter of subframe allocation by calculating the ratio of downlink to uplink subframes and using this ratio to determine which uplink subframes receive feedback from which downlink subframes. This parameter-based approach simplifies resource management while maintaining proper timing alignment.
Solution Approach 2:
The patent implements a structured feedback mechanism where feedback information is transmitted in specific uplink subframes determined by the calculated ratio. This feedback approach ensures that timing requirements are met while reducing overall transmission overhead through consolidated feedback transmission.
3Productivity
If FDR transmission is implemented, then spectral efficiency is improved, but self-interference and resource allocation challenges worsen
Solution Approach 1:
The patent segments the available spectrum and time resources into specific downlink and uplink subframes based on the calculated ratio. By assigning feedback transmission to specific uplink subframes only, the system maintains FDR spectral efficiency while preventing self-interference between simultaneous transmit and receive operations.
Solution Approach 2:
The patent applies local quality by treating different subframes differently based on their allocated function. Uplink subframes are specifically configured for feedback transmission while downlink subframes are for data transmission, creating localized functional zones that reduce self-interference while maintaining overall spectral efficiency.
Data Source
AI summary
The present invention relates to a wireless access system supporting a full duplex radio (FDR) transmission environment. A method for receiving feedback information by a base station in a wireless access system supporting FDR comprises the steps of: transmitting, to a terminal, frame configuration information of terminal-specific time division multiplexing (TDD); and receiving, from the terminal, feedback information in an uplink (UL) subframe according to the frame configuration information, wherein the frame configuration information can determine the location of the UL subframe in which feedback information for each DL subframe is to be transmitted, on the basis of the value obtained by dividing the number of downlink (DL) subframes by the number of UL subframes in a wireless frame.