Semi-Static HARQ-ACK Codebook for Frequency-Multiplexed Downlink Feedback
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Solution Overview
Problem
Existing wireless communication systems lack an efficient method for constructing a semi-static HARQ-ACK codebook for frequency-multiplexed downlink data transmissions, particularly in scenarios involving both unicast and multicast/broadcast services, leading to significant uplink overhead and resource limitations.
Innovation Solution
A semi-static HARQ-ACK codebook is constructed by configuring terminal devices with DL configuration information, using a 1-bit field in existing control messages to set acknowledgement indications, allowing flexible handling of multiplexed transmissions based on error states, thus reducing uplink overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate HARQ-ACK codebooks are constructed for each unicast/MBS service, then service-specific reliability is improved, but uplink overhead increases significantly
Solution Approach 1:
The patent merges multiple service-specific HARQ-ACK codebooks into a single unified codebook that accommodates both unicast and MBS services. This consolidation reduces the total number of separate feedback messages transmitted on the uplink, thereby reducing uplink overhead while maintaining the ability to provide reliable service-specific acknowledgments within the unified structure.
Solution Approach 2:
The unified HARQ-ACK codebook is designed to serve multiple functions simultaneously: it provides feedback for both unicast and MBS services, supports different service types within a single structure, and maintains service-specific reliability requirements. This multi-functionality eliminates the need for separate codebooks while preserving service differentiation.
2Quantity of substance
If a unified HARQ-ACK codebook is constructed for multiple services, then uplink overhead is reduced, but service-specific requirements may not be adequately met
Solution Approach 1:
Within the unified HARQ-ACK codebook, the patent segments feedback information by service type and priority level. Different services are allocated specific fields or regions within the codebook structure, allowing service-specific requirements to be met while maintaining overall unity. This segmentation enables differentiated handling of unicast and MBS services without requiring separate codebooks.
Solution Approach 2:
The unified codebook implements local quality by applying service-specific characteristics to specific portions of the codebook. Each service type receives appropriate feedback handling tailored to its requirements, while the overall codebook maintains a unified structure. This allows the system to reduce uplink overhead while still accommodating diverse service-specific needs through localized adaptations within the codebook.
3Adaptability or versatility
If dynamic HARQ-ACK codebook construction is used, then flexibility for different scenarios is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent employs semi-static codebook construction where the codebook structure is predetermined and configured in advance based on service requirements. This preliminary configuration reduces the need for complex dynamic adjustments during operation, lowering processing overhead while maintaining sufficient flexibility through the semi-static approach that allows periodic updates without full dynamic reconstruction.
Data Source
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AI summary
Example embodiments of the present disclosure relate to semi-static HARQ-ACK codebook construction for frequency-multiplexed DL data transmission. A first device includes at least one processor; and at least one memory including computer program codes; wherein the at least one memory and the computer program codes are configured to, with the at least one processor, cause the first device to: receive downlink configuration information from a second device, receive at least two frequency-multiplexed downlink transmissions at one downlink data transmission occasion, and set, based on the downlink configuration information and an error state of the frequency-multiplexed downlink data transmissions, an acknowledgement indication in a semi-static HARQ-ACK codebook to be transmitted to the second device for the downlink data transmission occasion.