Full Duplex Interference Rank Reporting by Victim UE
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Full duplex wireless communication systems face challenges due to self-interference and co-channel interference, limiting the potential capacity increase offered by simultaneous uplink and downlink communication over shared resources.
Innovation Solution
A victim UE in a full duplex network receives an indication of the maximum rank of an aggressor UE's uplink and measures reference signals to determine rank values, then transmits a CSI report including channel parameters, enabling the base station to optimize combined downlink+uplink throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex communication is implemented to double wireless link capacity, then throughput increases, but self-interference and co-channel interference worsen
Solution Approach 1:
The patent converts the harmful interference into beneficial information by having the victim UE measure reference signals from the aggressor UE and report channel state information (CSI) including rank indicators. The base station uses this interference characterization to optimize resource allocation and transport formats, transforming the interference problem into an opportunity for coordinated optimization that achieves near-full-duplex performance while managing interference effects.
Solution Approach 2:
The patent implements a feedback mechanism where the victim UE measures the interference from the aggressor UE using reference signals (SRS), determines rank values based on these measurements, and reports CSI back to the base station. This feedback loop enables the base station to adjust uplink and downlink transport formats dynamically, optimizing the combined throughput while accounting for the interference conditions in full duplex operation.
2Reliability
If interference cancellation techniques are applied to reduce interference, then signal quality improves, but system complexity increases
Solution Approach 1:
The patent introduces an intermediary approach where the victim UE acts as a measurement node that characterizes interference by measuring reference signals from the aggressor UE. Instead of implementing complex interference cancellation at the receiver, the system uses the victim UE's measurements and CSI reports as an intermediary information source, enabling the base station to optimize resource allocation and transport formats without requiring complex real-time interference cancellation hardware or algorithms.
3Productivity
If rank optimization is performed to maximize combined throughput, then spectral efficiency improves, but computational requirements increase
Solution Approach 1:
The patent applies partial action by having the victim UE measure and report CSI for a limited set of rank values (up to a maximum rank indicated by the base station) rather than evaluating all possible rank combinations. The base station uses these partial measurements and reports to determine optimal transport formats, achieving near-optimal throughput without the computational burden of exhaustive search across all possible rank and resource allocation combinations.
Data Source
AI summary
Aspects of the disclosure relate to a wireless user equipment (UE) configured to receive a downlink in a network configured for full duplex communication. The UE receives from the network an indication of a maximum rank of an uplink from an interfering, aggressor UE. The UE measures interference of a signal from the aggressor UE, and based on the measurement, determines one or more rank values for the aggressor UE, less than or equal to the maximum rank. The UE may further determine one or more channel parameters for downlink transmissions the UE receives, corresponding to the determined rank values. The UE then transmits a channel state information (CSI) report that includes an indication of at least one of the one or more rank values for the aggressor UE. The CSI report may further include the determined channel parameters. Other aspects, embodiments, and features are also claimed and described.