UE SR Collision Handling with Multiple PUSCH Transmissions
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Solution Overview
Problem
In wireless communication systems, particularly in NR and LTE, scheduling requests (SR) can collide with multiple physical uplink shared channel (PUSCH) transmissions, leading to latency and mis-dropped transmissions, which consume network and processing resources, and cause mis-coordination between user equipment (UE) and base stations.
Innovation Solution
Implementing a method for a UE to determine collisions between SR and multiple PUSCH transmissions in a slot, allowing for priority dropping of transmissions, where the UE may drop either the PUCCH transmission or the PUSCH transmissions based on whether they include a UL-SCH, thereby reducing latency and conserving resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a PUCCH transmission with SR overlaps with multiple PUSCH transmissions, then transmission collision occurs, but current configurations cannot handle the scenario where SR overlaps with both PUSCH with UL-SCH and PUSCH without UL-SCH
Solution Approach 1:
The patent segments the collision handling logic by distinguishing between different types of PUSCH transmissions (with UL-SCH vs. without UL-SCH). The UE identifies which specific PUSCH transmissions are involved in the collision and applies different dropping rules to each segment, enabling versatile handling of complex collision scenarios while maintaining reliable transmission of critical data.
2Loss of time
If UE drops transmissions to resolve collision, then latency is reduced, but mis-dropping occurs when incorrect transmission is dropped
Solution Approach 1:
The patent applies local quality by making the dropping decision specific to each PUSCH transmission's characteristics. The UE examines the local property of each PUSCH (whether it contains UL-SCH) and applies the appropriate quality rule: drop PUSCH without UL-SCH to reduce latency, but preserve PUSCH with UL-SCH to maintain reliability. This localized decision-making eliminates mis-dropping while achieving latency reduction.
3Reliability
If additional transmissions are sent to correct mis-dropped transmissions, then transmission reliability is improved, but network and processing resources are consumed
Solution Approach 1:
The patent implements preliminary action by making the correct dropping decision at the source (UE side) based on pre-defined rules. The UE proactively identifies the appropriate transmission to drop before transmission occurs, preventing mis-dropping from happening in the first place. This eliminates the need for subsequent corrective transmissions, thereby conserving network and processing resources while maintaining reliability.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine whether a collision is to occur between a physical uplink control channel (PUCCH) transmission that includes a scheduling request (SR), and multiple physical uplink shared channel (PUSCH) transmissions in a slot. The UE may transmit, to a base station (BS), the PUCCH transmission or the multiple PUSCH transmissions based at least in part on determining whether the collision is to occur in the slot. Numerous other aspects are provided.