Dynamic HARQ Feedback Timing via Slot Offset Configuration
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Solution Overview
Problem
Current mobile communication networks face challenges in efficiently managing and optimizing communication protocols across diverse wireless devices and base stations, particularly in supporting multiple technologies and releases, which affects traffic handling and system performance.
Innovation Solution
The implementation of advanced New Radio (NR) user plane and control plane protocol stacks, along with bandwidth adaptation and carrier aggregation techniques, enables flexible configuration and optimization of communication protocols to accommodate various wireless devices and base stations, improving traffic management and system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback is transmitted in every slot, then reliability of ACK/NACK transmission is improved, but signaling overhead and power consumption increase
Solution Approach 1:
The patent implements dynamic HARQ feedback transmission by allowing the UE to selectively transmit HARQ-ACK in specific slots based on whether downlink data was received, rather than transmitting in every slot. This dynamic approach reduces signaling overhead while maintaining reliability for actual data transmissions.
Solution Approach 2:
The patent changes the timing parameter of HARQ feedback transmission by introducing a variable k value that determines the slot offset for HARQ-ACK transmission. This allows flexible adjustment of feedback timing to optimize between reliability and overhead based on traffic conditions.
2Device complexity
If HARQ feedback timing is fixed, then system complexity is reduced, but flexibility in optimizing traffic handling is limited
Solution Approach 1:
The patent implements dynamic HARQ feedback timing by allowing the network to configure different k values for different traffic conditions and service types. This dynamic timing configuration provides flexibility in optimizing traffic handling while maintaining manageable system complexity through standardized configuration procedures.
Solution Approach 2:
The patent segments the HARQ feedback timing into multiple configurable options (different k values), allowing the system to select appropriate timing based on specific traffic requirements. This segmentation enables flexible traffic handling without requiring a completely complex timing management system.
3Productivity
If multiple HARQ processes are used, then throughput is improved, but difficulty in managing and optimizing protocols increases
Solution Approach 1:
The patent creates a universal HARQ management framework that handles multiple HARQ processes through standardized configuration and timing rules. The same k-value based timing mechanism applies across all HARQ processes, providing multi-functionality without proportionally increasing management complexity.
4Loss of time
If HARQ feedback is transmitted early, then latency is reduced, but probability of transmission error increases
Solution Approach 1:
The patent adjusts the timing parameter k to optimize the balance between latency and reliability. By configuring appropriate k values based on channel conditions and service requirements, the system can achieve early feedback when conditions permit while maintaining transmission reliability through adequate processing time.
Data Source
AI summary
A wireless device receives a first downlink control information (DCI) indicating a non-numerical value for a transmission of a feedback. The wireless device may also receive a second DCI indicating a slot offset indicating a slot for a physical uplink shared channel (PUSCH) and a first beta-offset value for multiplexing control information in the PUSCH. In response to the first beta-offset value being equal to or greater than a threshold, the wireless device may transmit the feedback via the PUSCH during the slot.