PDSCH Feedback Scheduling with Grouped HARQ-ACK Timing
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Solution Overview
Problem
Existing technologies face challenges in efficiently managing discontinuous reception and Hybrid Automatic Repeat Request (HARQ) feedback transmission in multicarrier communication systems, particularly in New Radio (NR) and Evolved UMTS Terrestrial Radio Access (E-UTRA) networks, which affect network performance and resource allocation.
Innovation Solution
The implementation of enhanced mechanisms for discontinuous reception (DRX) and HARQ feedback transmission, including dynamic modulation and coding schemes, logical channel prioritization, and MAC layer processes, to optimize resource allocation and improve network efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If discontinuous reception (DRX) is implemented to save energy, then energy consumption is reduced, but HARQ feedback transmission timing becomes complex and difficult to manage
Solution Approach 1:
The patent implements dynamic DRX configuration where the network can adjust DRX parameters (such as drx-OnDurationTimer, drx-SlotOffset) based on traffic conditions and HARQ feedback requirements. This allows the system to switch between energy-saving mode and performance-optimized mode dynamically, resolving the contradiction between energy consumption and feedback timing complexity.
Solution Approach 2:
The patent introduces multiple HARQ-ACK timing offset parameters (k1 values) that can be configured via RRC signaling. By changing these timing parameters dynamically according to traffic patterns and QoS requirements, the system can optimize both energy efficiency and feedback transmission timing, preventing the worsening of complexity while maintaining energy savings.
2Productivity
If multiple HARQ-ACK timing offsets are configured to optimize feedback transmission, then network performance is improved, but signaling overhead and configuration complexity increase
Solution Approach 1:
The patent segments the HARQ-ACK timing configuration into multiple independent k1 offset values, each associated with specific PDSCH reception scenarios. This segmentation allows the network to configure only the necessary timing offsets for specific traffic types, improving network performance while managing configuration complexity through selective activation.
Solution Approach 2:
The patent allows configuration of multiple HARQ-ACK timing offsets beyond what a single offset could provide, but the system activates only the necessary subset based on current traffic conditions. This partial action approach optimizes network performance for diverse scenarios while avoiding the full complexity of managing all possible configurations simultaneously.
3Productivity
If dynamic modulation and coding schemes are implemented, then resource allocation efficiency is improved, but processing complexity at MAC layer increases
Solution Approach 1:
The patent pre-configures multiple PDSCH-to-HARQ feedback timing offset values (k1 values) through RRC signaling before actual data transmission. This preliminary configuration allows the MAC layer to quickly select appropriate timing offsets based on pre-established rules, improving resource allocation efficiency while reducing real-time processing complexity through advance preparation.
Data Source
AI summary
A wireless device receives, from a base station, a first downlink control information (DCI) scheduling a physical downlink shared channel (PDSCH) transmission. The first DCI indicates: not to transmit feedback for the PDSCH transmission before receiving a second DCI; and a PDSCH group index. The wireless device receives the second DCI indicating: a time slot for transmitting feedback; and the PDSCH group index. The wireless device transmits, to the base station and based on the second DCI indicating feedback for a same PDSCH group index as the first DCI, the feedback for the PDSCH transmission in the time slot.