FDR Signal Reception via UE-Specific TDD Subframe Allocation
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Solution Overview
Problem
Wireless communication systems face inefficiencies in signal transmission and reception when using Full Duplex Radio (FDR) technology due to self-interference, multi-user interference, and inter-cell interference, which restricts frequency efficiency improvements.
Innovation Solution
The method involves an evolved Node B (eNB) transmitting an indicator for UE-specific TDD, frame configuration information, and allocating subframes to minimize self-interference by setting uplink and downlink subframes consecutively, with a special subframe always present, and using an RF unit and processor to manage these allocations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If FDR transmission is applied to improve frequency efficiency, then data transmission efficiency is improved, but self-interference occurs between transmission and reception signals
Solution Approach 1:
The radio frame is segmented into multiple subframes with different functions. Downlink subframes are dedicated for downlink transmission, uplink subframes for uplink transmission, and special subframes contain guard periods. This segmentation prevents self-interference by ensuring that transmission and reception do not occur simultaneously in the same frequency resources, while still allowing FDR operation in dedicated subframes.
Solution Approach 2:
Special subframes act as intermediaries between downlink and uplink subframes. These special subframes contain guard periods that provide transition time and frequency separation, mediating the switch between downlink and uplink operations and preventing interference between simultaneous transmission and reception operations.
2Adaptability or versatility
If frame configuration information is transmitted to indicate UE-specific TDD, then adaptability is improved, but signaling overhead increases
Solution Approach 1:
Different frame configuration information is provided to different user equipments based on their specific needs and capabilities. Each UE receives customized frame configuration indicators that match its service requirements, allowing the system to optimize performance for each user while managing signaling overhead through targeted rather than universal configuration transmission.
Data Source
AI summary
The present invention relates to a wireless access system supporting a full duplex radio (FDR) transmission environment. A signal transmission and reception method of a base station for a signal in a wireless access system supporting a FDR, according to one embodiment of the present invention, comprises the steps of: transmitting, to a terminal, an indicator which notifies of an application of terminal-specific time division duplex (TDD); transmitting, to the terminal, frame setting information according to the terminal-specific TDD; and transmitting and receiving a signal to and from the terminal on the basis of the frame setting information, wherein the frame setting information is capable of being set on the basis of a first constraint in which a first subframe is a downlink subframe and a special subframe always exists.