Intra-device Collision Handling for Wireless UEs
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Solution Overview
Problem
In wireless communications, intra-device collisions occur when downlink resources assigned by a base station to user equipment (UE) overlap in time or frequency, leading to unsuccessful receptions and inefficient use of network resources, particularly when UEs with lower priority transmissions are preempted by higher priority ones.
Innovation Solution
The implementation of a collision handling scheme that allows UEs to de-rate match and provide feedback for overlapping downlink transmission resources, ensuring that higher priority channels are processed independently of lower priority ones, and that feedback is sent based on the processing status of code blocks to facilitate retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If downlink resources are assigned to multiple channels that overlap in time, then network resource utilization is improved, but reception reliability deteriorates due to intra-device collisions
Solution Approach 1:
The patent segments the handling of overlapping downlink channels by introducing priority-based processing. High-priority channels (e.g., URLLC) are separated from low-priority channels (e.g., eMBB) and processed independently. The UE de-rate-matches high-priority channels around resources indicated by their control signaling, ensuring they are not affected by low-priority channel transmissions, thus resolving the reception reliability issue while maintaining network resource utilization.
Solution Approach 2:
The patent applies local quality by treating different channels with different priority levels differently. High-priority channels receive special handling with de-rate-matching around their specific resources, while low-priority channels are rate-matched around high-priority resources. This localized differential treatment ensures that critical communications maintain high reliability while allowing efficient use of remaining resources for lower-priority traffic.
2Adaptability or versatility
If UEs process overlapping transmissions, then processing capability is improved, but device complexity increases
Solution Approach 1:
The patent introduces dynamic processing based on channel priority. Instead of always processing all overlapping transmissions equally, the UE dynamically adjusts its processing behavior: for high-priority channels, it performs de-rate-matching around resources indicated by control signaling; for low-priority channels, it performs standard rate-matching. This dynamic adaptation allows the UE to handle overlapping transmissions efficiently without permanently increasing device complexity.
Solution Approach 2:
The patent enables self-service by allowing the UE to autonomously determine which channels to process and how to handle rate-matching based on priority indicators in the control signaling. The UE independently identifies high-priority channels and automatically applies the appropriate de-rate-matching or rate-matching procedures without requiring complex external coordination, thus improving processing capability while keeping device complexity manageable.
3Object-affected harmful factors
If rate-matching is applied to all channels, then interference is reduced, but feedback accuracy deteriorates due to preempted code blocks
Solution Approach 1:
The patent segments the feedback generation process by separately handling code blocks from high-priority and low-priority channels. For low-priority channels, the UE generates feedback only for code blocks that were not preempted by high-priority transmissions. This segmentation ensures that feedback accuracy is maintained for non-preempted blocks while allowing high-priority channels to preempt resources without causing harmful interference to the feedback mechanism.
Solution Approach 2:
The patent extracts preempted code blocks from the feedback generation process. When a low-priority channel's code blocks are preempted by high-priority transmissions, these preempted blocks are excluded from feedback generation. The UE generates feedback only for non-preempted code blocks, thereby maintaining feedback accuracy for the transmitted data while allowing the preemption mechanism to function without corruption of feedback information.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described to enable a user equipment (UE) to determine a rate-matching scheme or a feedback scheme for overlapping downlink transmission resources. A collision handling scheme may enable the UE to de-rate match a second, higher priority downlink shared channel independent of another rate-matching pattern or indicator for other shared channels, such as a first, overlapping downlink shared channel. The UE may determine to de-rate match the second channel around resources indicated within control signaling or higher-layer signaling associated with the second channel. The collision scheme may provide for the UE to generate an acknowledgement bit for feedback for one or more portions of the first channel that are preempted by the second channel and generate other feedback for non-preempted portions. A base station may keep track of preempted resources and may retransmit preempted portions of the first channel.