SPS PUCCH HARQ Deferral by Configuration for Downlink Collisions
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in handling semi-persistent scheduling (SPS) physical uplink control channel (PUCCH) hybrid automatic repeat request (HARQ) deferrals due to collisions with downlink symbols, leading to undesirable latency and impact on high-priority communications.
Innovation Solution
Implementing techniques that allow SPS HARQ-ACK deferral per SPS configuration, where HARQ feedback is delayed to the first available PUCCH, and configuring PUCCH groups based on traffic type and UE capabilities to optimize resource utilization and reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback is deferred to the first available PUCCH upon collision with downlink symbols, then reliability of uplink control channel transmissions is improved, but latency increases
Solution Approach 1:
The patent implements dynamic HARQ deferral behavior where the UE determines whether to defer HARQ feedback based on real-time collision detection with downlink symbols. The deferral is not static but adapts to the actual channel conditions and scheduling decisions, allowing the system to optimize between reliability and latency on a per-transmission basis.
Solution Approach 2:
The patent changes the timing parameter of HARQ feedback transmission by deferring it to the first available PUCCH when collisions are detected. This parameter change (transmission timing) resolves the contradiction by shifting the feedback to a reliable transmission opportunity while managing the latency through intelligent scheduling.
2Reliability
If PUCCH resources are reserved up to maximum deferral time, then reliability of HARQ feedback transmission is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent reserves PUCCH resources in advance up to the maximum deferral time to ensure reliable HARQ feedback transmission. This preliminary reservation of resources guarantees that when a collision occurs, the UE has pre-allocated resources available for deferred feedback, thereby improving reliability while the network manages overall resource efficiency.
3Device complexity
If SPS PUCCH HARQ bits are grouped with other HARQ bits in a PUCCH group, then device complexity is reduced, but measurement precision of HARQ feedback deteriorates
Solution Approach 1:
The patent segments HARQ bits into different groups based on their deferral configuration. SPS PUCCH HARQ bits configured for deferral are separated from those not configured for deferral, allowing independent handling of each group. This segmentation maintains device complexity at acceptable levels while improving the precision of HARQ feedback measurement by treating different bit types appropriately.
Data Source
AI summary
Apparatus, methods, and computer-readable media for semi-persistent scheduling (SPS) physical uplink control channel (PUCCH) hybrid automatic repeat request (HARQ) deferral for PUCCH groups are disclosed herein. A user equipment (UE) may receive, from a base station, a downlink configuration of a first physical uplink control channel (PUCCH) group that configures a first hybrid automatic repeat request (HARQ) feedback payload corresponding to a first semi-persistent scheduling (SPS) downlink packet for deferral and does not configure a second HARQ feedback payload corresponding to a second SPS downlink packet for deferral. The UE also may delay transmission of at least the first HARQ feedback payload based on different configurations for HARQ feedback deferral between the first SPS downlink packet and the second SPS downlink packet.