Uplink Spatial Relation Activation for Full Duplex CLI Mitigation
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Solution Overview
Problem
Existing wireless communication systems face challenges in effectively managing cross-link interference (CLI) during full duplex operations, leading to inaccurate CLI measurements and reduced channel performance, which affects transmission reliability and user experience.
Innovation Solution
The implementation of spatial relations for uplink channels, including configuring and activating spatial references for physical uplink control channels (PUCCH), sounding reference signals (SRS), and physical uplink shared channels (PUSCH) resources, specifically for sub-band full duplex (SBFD) and non-SBFD symbols, to manage duplex modes and mitigate CLI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex operations are implemented to increase spectral efficiency, then system capacity is improved, but cross-link interference increases leading to measurement inaccuracy
Solution Approach 1:
The patent introduces dedicated reference signals (SRS) and measurement resources as intermediaries to enable accurate CLI measurement. These reference signals serve as mediators between the interfering uplink signals and the downlink reception, allowing the system to measure interference levels without directly capturing the interfering signals themselves, thus resolving the measurement accuracy problem in full duplex operations.
Solution Approach 2:
The patent replaces traditional physical-layer interference measurement mechanisms with higher-layer signal processing techniques. Instead of relying solely on direct signal detection at the physical layer, the system uses reference signals and measurement resources processed through higher-layer algorithms to accurately characterize interference, enabling precise CLI measurement despite the presence of full duplex operations.
2Adaptability or versatility
If spatial relations are configured for multiple duplex modes, then adaptability is improved, but system complexity increases
Solution Approach 1:
The patent implements spatial relations that can serve multiple functions across different duplex modes (SBFD and non-SBFD). The same spatial relation framework is used universally for configuring both SBFD and non-SBFD operations, allowing a single configuration mechanism to handle multiple scenarios. This multi-functionality approach enables the system to adapt to different duplex modes without requiring separate complex configuration procedures for each mode.
Solution Approach 2:
The patent performs preliminary configuration of spatial relations during system setup, where the network entity pre-configures spatial relation parameters for both SBFD and non-SBFD modes. This preliminary action allows the UE to have ready-to-use spatial relation configurations when needing to switch between duplex modes, eliminating the need for complex real-time configuration and reducing operational complexity while maintaining high adaptability.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Techniques described herein provide for the configuration and activation of spatial relations for uplink communications. The spatial relations may be linked to spatial references for one of a physical uplink control channel (PUCCH) resource, a sounding reference signal (SRS) resource, or a physical uplink shared channel (PUSCH) resource. Once activated, a UE may send an uplink communication to a network entity on the indicated PUCCH resource, the SRS resource, or the PUSCH resource in accordance with activated spatial relations. These spatial relations may be activated for sub-band full duplex (SBFD) symbols, non-SBFD symbols, or both.