Wireless Signal ACK Feedback Across Multiple Slot Groups
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in transmitting and receiving wireless signals, particularly in managing acknowledgment/negative acknowledgement (A/N) feedback for multiple slot groups, which affects the overall efficiency and reliability of data transmission.
Innovation Solution
A method and device for wireless communication systems that utilize counter downlink assignment index (counter-DAI) and slot group indication information to manage A/N feedback, along with total-DAI for scheduling order, enabling efficient transmission and reception of wireless signals, especially in unlicensed bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If A/N feedback is transmitted for multiple slot groups using traditional methods, then coverage is maintained, but transmission efficiency deteriorates due to increased feedback overhead and complexity
Solution Approach 1:
The system divides the feedback management into two distinct components: counter-DAI for tracking scheduling order within a slot group, and total-DAI for indicating the total number of slot groups. This segmentation allows the wireless device to efficiently manage A/N feedback across multiple slot groups by processing counter-DAI values sequentially and using total-DAI to determine when feedback transmission is complete, thereby improving transmission efficiency while maintaining manageable complexity
Solution Approach 2:
The counter-DAI and total-DAI fields act as intermediaries between the network device and wireless device for coordinating A/N feedback transmission. The counter-DAI serves as a running counter that mediates the scheduling order, while total-DAI mediates the overall feedback structure by indicating the total number of slot groups, enabling efficient feedback management without direct complex coordination
2Reliability
If A/N feedback includes information for all slot groups, then reliability is improved, but feedback overhead increases
Solution Approach 1:
The system dynamically adjusts the A/N feedback structure by using counter-DAI to indicate the current scheduling position and total-DAI to indicate the total number of slot groups. This dynamic approach allows the feedback to be reliably comprehensive (covering all scheduled slot groups) while optimizing the quantity of feedback information by only transmitting necessary A/N bits for actually scheduled groups rather than fixed overhead for all possible groups
3Measurement precision
If scheduling order is tracked across multiple slot groups, then transmission accuracy is improved, but processing complexity increases
Solution Approach 1:
The counter-DAI field serves as a self-updating mechanism that automatically tracks the scheduling order across slot groups. Each time a slot group is scheduled, the counter-DAI increments, providing automatic and accurate tracking of the scheduling order without requiring complex external coordination or processing, thereby improving measurement precision while keeping processing complexity low
Data Source
AI summary
A wireless communication system and, particularly, a method and a device therein, for receiving a first downlink control information, DCI, including a counter downlink assignment index, counter-DAI, and slot group indication information, wherein the counter-DAI indicates a scheduling order in a slot group, and the slot group indication information indicates a first slot group from among a plurality of slot groups; receiving downlink data on the basis of the first DCI; receiving a second DCI including a total-DAI and requiring acknowledgment/negative acknowledgement, A/N, feedback for the first slot group from among the plurality of slot groups, wherein the total-DAI indicates the total number of schedulings in a slot group; and transmitting uplink control information including A/N information about the first slot group on the basis of the counter-DAI and the total-DAI.