PDSCH DCI Format for MIRS Retransmission Scheduling
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Solution Overview
Problem
Conventional DCI signaling for MIRS in wireless communications systems results in excessive resource overhead and inefficiencies due to frequent re-transmissions and complex slot structures, particularly in rapidly changing channels, leading to increased latency and underutilization of channel capacity.
Innovation Solution
A new DCI format for PDSCH scheduling in MIRS that utilizes feedback information for re-transmission scheduling policies, including parameters like code block ordering, redundancy version increase, and resource allocation, reducing unnecessary redundancy and optimizing resource use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional DCI signaling is used for MIRS re-transmissions, then complete scheduling information can be provided, but resource overhead increases excessively
Solution Approach 1:
The patent extracts and removes redundant scheduling parameters from DCI format for MIRS re-transmissions. By identifying that certain parameters remain unchanged across re-transmissions (e.g., frequency resource allocation, time resource allocation, MCS), the invention omits these parameters from re-transmission DCI signaling, keeping only essential information like HARQ process ID and redundancy version. This extraction principle directly reduces resource overhead while maintaining necessary scheduling functionality.
Solution Approach 2:
The patent creates a universal DCI format that serves multiple functions: it handles both initial transmissions and re-transmissions, supports different HARQ processes, and adapts to varying channel conditions. The simplified DCI format is designed to be universally applicable across different MIRS scenarios, reducing the need for multiple specialized signaling formats and thereby reducing overall resource overhead.
2Reliability
If frequent re-transmissions are performed in rapidly changing channels, then reliability improves, but latency increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring re-transmission parameters and policies before actual re-transmissions occur. The network entity establishes re-transmission scheduling policies in advance, including parameters like redundancy versions and timing relationships. This preliminary configuration enables faster re-transmission responses to ACK/NACK feedback without requiring extensive real-time signaling, thereby reducing latency while maintaining reliability.
Solution Approach 2:
The patent implements feedback mechanisms where the network entity receives ACK/NACK information from the UE and adjusts re-transmission strategies accordingly. The DCI format includes fields for HARQ process identification and redundancy version indication, enabling the network to feedback-driven re-transmissions. This feedback loop allows the system to adapt to channel conditions dynamically, improving reliability while minimizing unnecessary re-transmissions that would increase latency.
3Adaptability or versatility
If complex slot structures are used for MIRS, then scheduling flexibility improves, but resource utilization efficiency decreases
Solution Approach 1:
The patent segments the DCI signaling into essential and non-essential parameters. By dividing the scheduling information into core elements (frequency allocation, time allocation, MCS) and optional elements (redundancy version, HARQ process ID), the invention enables selective transmission based on whether it's an initial transmission or re-transmission. This segmentation allows the system to maintain scheduling flexibility when needed while improving resource utilization efficiency by omitting redundant parameters in re-transmission scenarios.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. An example method includes receiving a first transmission of one or more code blocks in a first slot and transmitting uplink control information that includes acknowledgement information for the one or more code blocks. The method also includes receiving a scheduling signal that indicates one or more parameters associated with a re-transmission scheduling policy based at least in part on the acknowledgement information. The method also includes receiving a second transmission of at least a portion of the one or more code blocks in a second slot and decoding the second transmission of at least the portion of the one or more code blocks according to the re-transmission scheduling policy.