Sidelink HARQ-ACK Feedback Handling in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently handling sidelink and uplink hybrid automatic repeat request-acknowledgement (HARQ-ACK) feedback, particularly in next-generation wireless communication networks like 5G, where high data throughput and reliable feedback mechanisms are crucial for voice over IP and multimedia services.
Innovation Solution
The method and apparatus enhance sidelink and uplink HARQ-ACK handling by employing advanced techniques such as beamforming, multiple-input multiple-output (MIMO) systems, and specific control channel configurations, including the use of DCI format 5A and SCI format 1, to improve signal-to-noise ratio and resource allocation for sidelink transmissions, enabling efficient HARQ feedback in NR-V2X and Uu link enhancements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sidelink and uplink HARQ-ACK feedback are handled using traditional methods, then device complexity is reduced, but feedback reliability and data throughput are insufficient for 5G services
Solution Approach 1:
The patent segments the feedback handling by introducing separate DCI formats (5A for sidelink, 1_1 for uplink) and distinct resource allocation mechanisms for different feedback types. This segmentation allows independent optimization of each feedback path, improving reliability without requiring complete system redesign.
Solution Approach 2:
The patent creates a universal feedback handling framework where a single UE can manage both sidelink and uplink HARQ-ACK feedback through unified resource allocation principles. The network node configures multiple resource sets that can be selectively activated based on service requirements, providing multi-functionality while maintaining manageable complexity.
2Productivity
If advanced techniques like beamforming and MIMO are employed, then signal-to-noise ratio and data throughput improve, but device complexity increases
Solution Approach 1:
The patent utilizes parameter changes by configuring multiple resource sets with different parameters (time-domain, frequency-domain, spatial parameters) to support beamforming and MIMO operations. The network can dynamically adjust these parameters based on channel conditions, achieving high throughput while managing complexity through standardized parameter configurations.
Solution Approach 2:
The network node acts as an intermediary that manages the complexity of beamforming and MIMO configurations. It generates and transmits DCI messages that contain pre-processed resource allocation information, shielding the UE from the full complexity of advanced antenna techniques while still enabling their benefits.
3Reliability
If separate resource allocation is used for sidelink and uplink feedback, then feedback reliability improves, but resource utilization efficiency decreases
Solution Approach 1:
The patent implements dynamic resource allocation where the network node can selectively activate or deactivate resource sets based on current service requirements and channel conditions. This allows the system to use separate resources when reliability is critical while falling back to more efficient shared resources when conditions permit, balancing reliability and energy efficiency dynamically.
Data Source
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AI summary
A method and apparatus are disclosed. In an example from the perspective of a first device, the first device is configured with a second set of slot offsets by a network. The first device receives, from the network, a second Downlink Control Information, DCI, scheduling a sidelink resource (1505). The first device performs sidelink transmission, to a second device, on the sidelink resource (1510). The first device monitors and/or receives a sidelink hybrid automatic repeat request-acknowledgement, SL HARQ-ACK, feedback from the second device in a fourth slot (1515). The SL HARQ-ACK feedback is associated with the sidelink transmission. The first device derives, based on the fourth slot and a second slot offset value indicated by the second DCI, a third slot for transmitting a SL HARQ-ACK to the network (1520). The second set of slot offsets includes the second slot offset value. The SL HARQ-ACK is set/derived/determined based on the received SL HARQ-ACK feedback.