Frequency Domain Guard Band for Full-Duplex Interference Reduction
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Solution Overview
Problem
Existing wireless communication systems face challenges in supporting full-duplex communications due to interference issues caused by differences in uplink and downlink waveforms, leading to inefficiencies and reduced performance.
Innovation Solution
The implementation of a frequency-domain gap based on a waveform pair, including respective uplink and downlink waveforms, to create a guard band that minimizes interference and enables efficient full-duplex communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex communications are implemented with overlapping uplink and downlink resources, then communication efficiency is improved, but interference between uplink and downlink signals increases
Solution Approach 1:
The frequency domain is segmented into distinct uplink and downlink resource sets with a guard band separating them. This segmentation allows simultaneous full-duplex communication while preventing direct interference between uplink and downlink signals through frequency separation.
Solution Approach 2:
A guard band is introduced as an intermediary frequency region between uplink and downlink resources. This guard band acts as a buffer that prevents harmful interference from leaking between the uplink and downlink signal sets while allowing both to operate simultaneously.
2Object-affected harmful factors
If a frequency-domain gap (guard band) is introduced between uplink and downlink resources, then interference is reduced, but available communication bandwidth decreases
Solution Approach 1:
The guard band is strategically positioned at specific frequency locations where interference is most likely to occur, rather than uniformly distributed throughout the spectrum. This localized approach reduces interference effectiveness while minimizing the impact on total available bandwidth.
Solution Approach 2:
The width of the guard band is dynamically adjusted based on the specific waveform pair being used and the degree of interference observed. By making the guard band parameter adaptable rather than fixed, the system optimizes the balance between interference reduction and bandwidth utilization.
3Object-affected harmful factors
If waveform-specific frequency gaps are configured, then interference is minimized for each waveform pair, but system complexity increases
Solution Approach 1:
A single guard band configuration mechanism is designed to serve multiple waveform pairs and communication scenarios. This universal approach allows the system to handle different waveform combinations (e.g., CP-OFDM with DFT-s-OFDM, or both CP-OFDM) using the same fundamental guard band principle, reducing overall system complexity.
Solution Approach 2:
The guard band configuration is pre-established based on the detected waveform pair type before actual communication begins. By preparing the frequency gap configuration in advance according to the waveform combination, the system avoids real-time complex calculations and reduces operational complexity.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a control message from a base station indicating a configuration of an uplink waveform for full-duplex communications at the UE. The UE may receive an additional control message scheduling a set of uplink resources and a set of downlink resources for the full-duplex communications. The set of uplink resources and the set of downlink resources may at least partially overlap in a time-domain. A frequency-domain gap between the set of uplink resources and the set of downlink resources may be based on the first uplink waveform and a first downlink waveform used by the base station. The UE may communicate with the base station on the set of uplink resources and the set of downlink resources in accordance with the frequency-domain gap.