HARQ Feedback Scheduling for Multiple Downlink Transmissions
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently handling high-frequency data transmissions, particularly in millimeter wave communication, due to complexities arising from beamforming and the need for improved data signaling and feedback signaling with low signaling overhead.
Innovation Solution
The proposed solution involves scheduling multiple data transmissions with a single control information message and optimizing feedback signaling, allowing separate data transmissions to be encoded independently with low overhead, using configurable tables for slot offsets and feedback occasions, and enabling flexible scheduling and feedback transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station transmits multiple downlink data packets in advance, then the data transmission efficiency is improved, but the user equipment needs to buffer multiple packets and feed back buffer status, increasing feedback complexity
Solution Approach 1:
The feedback mechanism is segmented into two distinct types: buffer status feedback for early data transmission opportunities and HARQ-ACK feedback for subsequent transmissions. This segmentation allows the system to handle different feedback requirements separately, reducing overall feedback complexity while maintaining high transmission efficiency.
Solution Approach 2:
The feedback type dynamically changes based on the reception status of downlink data. When early data is received, buffer status feedback is used; when retransmissions occur, HARQ-ACK feedback is used. This dynamic adaptation optimizes the feedback mechanism according to real-time transmission conditions.
2Loss of time
If early data transmission is implemented, then latency is reduced, but distinguishing between new data and retransmission becomes difficult
Solution Approach 1:
The system performs preliminary action by transmitting downlink data early before the scheduled transmission time. This early transmission reduces latency by getting data into the system sooner, while the feedback mechanism tracks whether this early data was successfully received to determine if retransmission is needed.
Solution Approach 2:
The feedback mechanism provides critical information about whether early transmitted data was successfully received. Buffer status feedback indicates successful reception, while the absence of buffer status feedback or specific HARQ-ACK feedback indicates retransmission is needed, thereby preserving data type identification.
3Productivity
If multiple downlink data packets are transmitted in advance, then throughput is improved, but power consumption increases due to continuous monitoring requirements
Solution Approach 1:
The system uses periodic action through scheduled feedback opportunities where user equipment only needs to monitor and transmit feedback at specific intervals rather than continuously. This periodic monitoring maintains data throughput by ensuring timely feedback while significantly reducing power consumption compared to continuous monitoring.
Data Source
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AI summary
There is disclosed a receiving radio node in a wireless communication network, the method comprising transmitting feedback signaling based on a received control information message scheduling multiple separate data transmissions for reception by the receiving radio node. The disclosure also pertains to related devices and methods.