HARQ Identifier Handling for CLI Measurement Collisions
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Solution Overview
Problem
In wireless communication systems, incorrectly assigned or tracked hybrid automatic repeat request (HARQ) identifiers due to cross-link interference (CLI) can cause errors in data decoding and synchronization issues between user equipment (UE) and network nodes, particularly when communications are dropped due to CLI measurements, leading to misalignment and unnecessary use of HARQ identifiers.
Innovation Solution
The UE and network node synchronize HARQ identifier determinations by receiving configurations indicating time domain resources for CLI measurements and scheduling information that ensures non-overlapping or partial overlap of communications, allowing incremental HARQ identifiers only for specific communications, thus avoiding misalignment and unnecessary identifier usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If HARQ identifiers are incremented for all scheduled communications, then the HARQ process tracking is simplified, but synchronization errors occur when communications are dropped due to CLI measurements
Solution Approach 1:
The patent applies local quality by differentiating the treatment of HARQ identifiers based on the specific communication context. Instead of uniformly incrementing HARQ identifiers for all scheduled communications, the system selectively increments identifiers only for communications that are actually transmitted and not dropped due to CLI measurements. This localized differentiation resolves the contradiction by maintaining simple tracking rules while ensuring synchronization accuracy only where needed.
2Object-affected harmful factors
If communications are dropped due to CLI measurement overlaps, then interference is avoided, but HARQ identifier misalignment occurs between UE and network node
Solution Approach 1:
The patent implements feedback by having the UE inform the network node about which communications are dropped due to CLI measurement overlaps. This feedback mechanism allows the network node to adjust its HARQ identifier assignment to match the UE's perspective, preventing identifier misalignment. The feedback loop ensures that both parties maintain consistent HARQ process tracking despite selective communication dropping.
3Productivity
If multiple HARQ processes are used to avoid round trip time impact, then throughput is improved, but complexity of HARQ identifier management increases
Solution Approach 1:
The patent applies segmentation by dividing the HARQ identifier management into distinct segments or categories. Communications are segmented into those that should have their HARQ identifiers incremented and those that should not (those dropped due to CLI measurements). This segmentation simplifies the overall management complexity by providing clear rules for each segment, allowing multiple HARQ processes to operate efficiently without overwhelming identifier management complexity.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. Various aspects relate generally to hybrid automatic repeat request (HARQ) identifier determination associated with cross-link interference (CLI) measurements. Some aspects more specifically relate to handling of HARQ identifier determinations for communications that are dropped due to collision with a CLI measurement. In some aspects, a user equipment (UE) and/or a network node may skip an increment of a value of a HARQ identifier for communications that are dropped due to collisions with CLI measurements. Where the scheduling information indicates or is associated with a single HARQ identifier, the UE and/or the network node may not increment the HARQ identifier for communications, from the multiple communications, that are dropped because of a collision with a CLI measurement.