HARQ Timing Determination via PDSCH Scheduling Indicators
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Solution Overview
Problem
Current wireless communication systems face challenges in smoothly providing services, particularly in 5G communication systems, due to complexities in scheduling and timing of hybrid automatic repeat request (HARQ) processes, which affect data transmission and reception efficiency.
Innovation Solution
A method and apparatus that involve a user equipment (UE) receiving a physical downlink shared channel (PDSCH) scheduling type indicator and a hybrid automatic repeat and request (HARQ) timing indicator from a base station (BS), allowing the UE to determine HARQ timing based on these indicators for efficient data transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HARQ timing is fixed and predetermined in wireless communication systems, then system simplicity is maintained, but data transmission efficiency and service smoothness deteriorate due to inability to adapt to varying scheduling requirements
Solution Approach 1:
The patent applies dynamics by making the HARQ timing flexible rather than fixed. The UE determines HARQ timing dynamically based on the PDSCH scheduling type indicator and HARQ timing indicator received from the BS. This allows the system to adapt HARQ timing to different scheduling scenarios (slot-based and non-slot-based) while maintaining a relatively simple determination mechanism through indicator-based control.
2Productivity
If slot-based scheduling is used for PDSCH transmission, then resource allocation efficiency is improved, but HARQ feedback timing flexibility deteriorates due to fixed slot structure constraints
Solution Approach 1:
The patent segments the scheduling approach into two distinct types: slot-based scheduling and non-slot-based scheduling. The PDSCH scheduling type indicator allows the system to select between these segments, enabling slot-based scheduling for efficiency when needed, while non-slot-based scheduling provides flexibility for scenarios requiring adaptive HARQ timing. This segmentation resolves the contradiction by offering both modes within a unified framework.
3Adaptability or versatility
If non-slot-based scheduling is used for PDSCH transmission, then HARQ feedback timing flexibility is improved, but resource allocation efficiency deteriorates due to less structured resource management
Solution Approach 1:
The patent creates a universal scheduling framework that can handle both slot-based and non-slot-based scheduling through the PDSCH scheduling type indicator. This multi-functional approach allows the same HARQ timing determination mechanism to work efficiently for both scheduling types, ensuring resource allocation efficiency is maintained even when using flexible non-slot-based scheduling for adaptive scenarios.
4Reliability
If HARQ timing is determined without explicit indicators, then signaling overhead is reduced, but timing accuracy and reliability deteriorate due to ambiguous timing determination
Solution Approach 1:
The patent introduces intermediaries (PDSCH scheduling type indicator and HARQ timing indicator) that mediate between the BS and UE for HARQ timing determination. These indicators provide explicit timing information to ensure accuracy and reliability, while being compact in size to minimize signaling overhead. The indicators act as efficient intermediaries that convey necessary timing information without excessive overhead.
Data Source
AI summary
Provided are a method and apparatus for transmitting and receiving control information in a wireless communication system, and the method includes receiving a physical downlink share channel (PDSCH) scheduling type indicator and a hybrid automatic repeat and request (HARQ) timing indicator from a base station (BS) and determining an HARQ timing based on the PDSCH scheduling type indicator and the HARQ timing indicator.