Full Duplex UE CSI Report With Uplink Bandwidth
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Solution Overview
Problem
Full duplex-capable user equipment (UE) in wireless communications systems faces self-interference issues due to simultaneous transmission and reception, which complicates scheduling and resource allocation, especially when conventional CSI reports lack uplink bandwidth information, leading to incorrect downlink and uplink transport format determination.
Innovation Solution
The system enables a full duplex UE to receive a CSI reporting configuration from a base station, monitor CSI-RS, and transmit a full duplex CSI report that includes uplink bandwidth information, allowing the base station to estimate CSI for various bandwidths and schedule simultaneous uplink and downlink traffic effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex UE transmits and receives simultaneously on the same frequency, then spectral efficiency is improved, but self-interference occurs at the UE
Solution Approach 1:
The patent converts the harmful self-interference into a measurable parameter by having the UE report uplink bandwidth information through CSI reports. The base station uses this information to estimate CSI and determine appropriate transport formats that account for the self-interference, thereby transforming the harmful effect into useful scheduling information.
Solution Approach 2:
The patent implements a feedback mechanism where the UE monitors CSI-RS and transmits CSI reports containing uplink bandwidth information back to the base station. This feedback loop enables the base station to adjust scheduling decisions based on actual channel conditions and self-interference levels, optimizing full duplex operation.
2Device complexity
If conventional CSI reports are used without uplink bandwidth information, then reporting complexity is reduced, but incorrect downlink and uplink transport format determination occurs
Solution Approach 1:
The patent applies preliminary action by having the UE prepare and report uplink bandwidth information in advance through modified CSI reports. This allows the base station to have accurate channel state information available before making scheduling decisions, ensuring correct transport format determination for both uplink and downlink transmissions.
3Adaptability or versatility
If the UE reports CSI for multiple possible uplink bandwidths, then scheduling flexibility is improved, but uplink control channel resource consumption increases
Solution Approach 1:
The patent makes the CSI report multi-functional by having it serve both as traditional channel state information and as uplink bandwidth information. By embedding uplink bandwidth indicators within the existing CSI report structure, the same uplink control channel resources carry dual-purpose information, reducing overall resource consumption while maintaining scheduling flexibility.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A full duplex user equipment (UE) may provide a channel state information (CSI) report to abase station to enable the base station to schedule simultaneous uplink and downlink communications for the full duplex UE. For example, the base station may transmit a CSI report configuration to the UE that indicates for the UE to report a full duplex CSI. In some cases, the CSI report configuration may include the UE to report CSI under a full duplex mode with or without an indication of an uplink bandwidth. Accordingly, the UE may calculate and report the self-full duplex mode CSI to the base station according to the received configuration. The base station may then determine a radio resource allocation and transport format for downlink data transfer and for uplink data transfer under the full duplex mode.