Reverse UE-UE CLI Measurement in Non-Overlapping SBFD
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Solution Overview
Problem
Legacy UEs in non-overlapping subband-fullduplex (SBFD) deployments lack the capability to measure and report cross-link interference (CLI) due to the absence of UE-UE CLI measurement features in 3GPP Release 16 and later specifications, necessitating a solution for effective CLI measurement and management.
Innovation Solution
Proposed methods involve UEs performing measurements on transmissions by other UEs in SBFD deployments, reporting results per receiver antenna, and configuring quasi-collocation (QCL)-Type D spatial relationships for SRS and PUSCH/PUCCH transmissions to enhance CLI measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If SBFD deployment is implemented to reduce TDD alignment delay and improve coverage, then latency is reduced and coverage is improved, but CLI interference to legacy UEs increases and legacy UEs cannot measure or report CLI levels
Solution Approach 1:
The patent introduces a base station as an intermediary that performs reverse CLI measurement on behalf of legacy UEs. The base station measures the CLI received from UE transmissions in UL subbands and uses this information to schedule legacy UEs appropriately, thereby protecting them from CLI interference without requiring legacy UEs to have measurement capabilities.
Solution Approach 2:
Instead of having UEs measure CLI on transmissions received from other UEs (forward measurement), the patent implements reverse measurement where the base station measures CLI on transmissions received from UEs in UL subbands. This inversion allows the network side to acquire CLI information for legacy UE protection.
2Measurement precision
If UE-UE CLI measurement feature is added to enable legacy UEs to measure CLI, then CLI measurement capability is improved, but device complexity and specification compatibility increase
Solution Approach 1:
The base station performs CLI measurement functions that would otherwise require UE capability. By having the network side conduct the measurements and manage the CLI information, the patent eliminates the need for complex UE measurement features while still achieving CLI awareness and legacy UE protection.
3Measurement precision
If per-antenna CLI measurement is implemented to improve measurement accuracy, then measurement precision is improved, but reporting complexity and processing overhead increase
Solution Approach 1:
The patent enables per-antenna CLI measurement at the base station to assess interference characteristics for each receive antenna separately. This local quality assessment allows the base station to make informed scheduling decisions for each UE based on specific antenna interference patterns, improving legacy UE protection while maintaining manageable reporting requirements.
Data Source
AI summary
Techniques pertaining to reverse user equipment to user equipment (UE-UE) cross-link interference (CLI) measurement in non-overlapping subband-fullduplex (SBFD) deployment are described. A UE performs a measurement related to a transmission by another UE in a SBFD deployment. The UE then reports a result of the measurement per receiver (Rx) antenna of a plurality of Rx antennas separately.