Prioritizing Scheduling Requests Over HARQ-ACK on PUCCH
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Solution Overview
Problem
In cellular communications, the existing procedure for Physical Uplink Control Channel (PUCCH) format 0 and Hybrid Automatic Repeat Request (HARQ) feedback format 1 results in inability to multiplex Scheduling Requests (SR) and HARQ-ACK, prioritizing HARQ-ACK transmission, which is undesirable for latency-sensitive Ultra-Reliable Low-Latency Communication (URLLC) traffic, leading to increased downlink load and inter-cell interference.
Innovation Solution
Prioritization and multiplexing of SR using PUCCH format 0 and HARQ using PUCCH format 1 when their resources overlap, based on priority levels, allowing SR to be transmitted over PUCCH format 0 and HARQ-ACK over PUCCH format 1, with conditions such as HARQ-ACK bit values determining transmission paths, and using cyclic shifts to differentiate SR and HARQ-ACK transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If HARQ-ACK is prioritized over SR transmission when PUCCH resources overlap, then downlink load and inter-cell interference are reduced, but latency for uplink transmissions increases
Solution Approach 1:
The patent introduces dynamic prioritization where the UE can adaptively select between transmitting SR or HARQ-ACK based on real-time conditions. The network can configure different PUCCH resources with different priorities, and the UE dynamically determines which transmission to perform based on the overlap situation and configured priorities, resolving the static contradiction between reducing downlink load and maintaining low uplink latency
Solution Approach 2:
The patent changes the priority parameter of PUCCH transmissions by introducing priority indicators for different PUCCH resources. The network configures PUCCH resources with different priority levels, and the UE uses these priority parameters to resolve conflicts between SR and HARQ-ACK transmissions, allowing flexible trade-off between downlink load reduction and uplink latency
2Object-affected harmful factors
If HARQ-ACK is prioritized over SR transmission when PUCCH resources overlap, then inter-cell interference is reduced, but uplink transmission efficiency deteriorates
Solution Approach 1:
The patent enables dynamic selection between SR and HARQ-ACK transmission based on configured priorities and real-time conditions. When SR has higher priority, the UE transmits SR to maintain uplink efficiency for latency-sensitive traffic; when HARQ-ACK has higher priority, the UE transmits HARQ-ACK to reduce inter-cell interference. This dynamic approach resolves the contradiction between reducing interference and maintaining transmission efficiency
Solution Approach 2:
The patent introduces priority parameters for PUCCH resources that can be configured by the network. By changing the priority parameter assignment, the system can flexibly control whether SR or HARQ-ACK is transmitted first, allowing optimization of both inter-cell interference reduction and uplink transmission efficiency based on network conditions and service requirements
Data Source
AI summary
Systems and methods are disclosed herein that relate to prioritization of Scheduling Requests (SRs) and Hybrid Automatic Repeat Request (HARQ) feedback information. In one embodiment, a method performed by a wireless communication device for prioritization between a Scheduling Request (SR) occasion and Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) information scheduled on overlapping Physical Uplink Control Channel (PUCCH) resources comprising prioritizing or multiplexing a SR occasion on a first PUCCH resource and HARQ-ACK information on a second PUCCH resource, the first PUCCH resource and the second PUCCH resource at least partially overlapping in time. In this manner, latency improvement for uplink (UL) is provided without introducing higher downlink (DL) load nor inter-cell interference since unnecessary re-transmissions can be avoided.