Cross-Link Interference Measurement in SBFD Subbands
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Solution Overview
Problem
Wireless communication systems face challenges in managing cross-link interference (CLI) during subband full-duplex (SBFD) operations, particularly in scenarios where UEs experience interference from nearby UEs using similar frequencies, impacting receiver dynamic range and performance.
Innovation Solution
Implementing signaling- or configuration-based mechanisms for UEs to measure CLI during SBFD symbols, allowing them to prioritize either downlink signals or CLI measurements based on capabilities and scheduling conflicts, thereby enhancing synchronization and adjusting receiver dynamic range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If UEs perform CLI measurements during SBFD symbols, then measurement precision is improved, but receiver dynamic range is reduced due to interference from simultaneous transmissions
Solution Approach 1:
The patent segments the frequency spectrum into separate uplink and downlink subbands, allowing simultaneous full-duplex operation. By dividing the bandwidth and assigning specific subbands for uplink and downlink transmissions, the system enables CLI measurements in dedicated subbands while maintaining full-duplex capability in other subbands, thus improving measurement precision without completely sacrificing receiver dynamic range.
Solution Approach 2:
The patent applies local quality by configuring specific subbands for CLI measurement purposes while maintaining different operational characteristics in other subbands. The network can selectively enable full-duplex operation in certain subbands while performing measurements in others, allowing localized optimization of measurement accuracy without globally impacting receiver performance.
2Reliability
If UEs prioritize downlink signal reception over CLI measurements, then communication reliability is maintained, but measurement accuracy deteriorates
Solution Approach 1:
The patent implements dynamic prioritization where the UE can flexibly switch between prioritizing downlink signal reception and prioritizing CLI measurements based on current channel conditions, traffic requirements, and network configurations. This dynamic approach allows the system to adapt to varying conditions, maintaining communication reliability when needed while enabling accurate measurements when conditions permit.
Solution Approach 2:
The patent employs periodic CLI measurements scheduled at specific intervals rather than continuous measurements. This periodic approach allows the UE to alternate between normal downlink reception and dedicated measurement periods, ensuring that communication reliability is maintained during data transmission while still achieving adequate measurement accuracy during scheduled measurement opportunities.
3Productivity
If SBFD operation is implemented to increase system capacity, then spectral efficiency is improved, but cross-link interference between UEs increases
Solution Approach 1:
The patent segments the available spectrum into distinct uplink and downlink subbands, enabling simultaneous full-duplex operation. This frequency division allows the system to achieve high spectral efficiency by utilizing the entire bandwidth for bidirectional communication while reducing cross-link interference through spatial and frequency separation of interfering signals.
Solution Approach 2:
The patent implements feedback mechanisms where UEs report CLI measurement results to the network, which then uses this information to dynamically adjust resource allocation, power control, and scheduling decisions. This feedback loop enables the system to maintain high capacity while actively managing and mitigating cross-link interference through informed resource management.
Data Source
AI summary
This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for cross-link interference (CLI) measurement in subband full-duplex (SBFD) operation. In some aspects, a first user equipment (UE) may measure CLI from a second UE during a SBFD symbol in one or more uplink subbands or in one or more downlink subbands, or in a combination thereof. The first UE and a network entity may support one or more prioritization rules associated with one or both of a capability of the first UE and potential scheduling conflicts at the first UE during the SBFD symbol. In some aspects, the first UE may measure a CLI reference signal transmitted by the second UE in one or more uplink subbands and in one or more downlink subbands allocated to the first UE to obtain an inter-subband CLI measurement and an intra-subband CLI measurement.