HARQ Codebook Generation for Wireless Nodes
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Solution Overview
Problem
In wireless communication systems, particularly in the 5G NR standard, the existing HARQ-ACK codebook generation methods are inefficient when dealing with a large number of HARQ process identities, leading to increased control signaling overhead and complexity, especially in scenarios supporting frequencies from 52.6 GHz to 71 GHz.
Innovation Solution
A method and device for generating HARQ codebooks that dynamically adjust based on enabled HARQ process identities, reducing the number of reserved HARQ-ACK bits and optimizing uplink signaling overhead by using a unified solution applicable to various scenarios, including those between 52.6 GHz and 71 GHz, by indicating only the enabled HARQ process identities and using a time window for scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If type 1 HARQ-ACK codebook is used to support all HARQ process identities, then coverage of HARQ processes is improved, but control signaling overhead increases
Solution Approach 1:
The patent segments the HARQ process identities into two groups: those that are disabled (K1 identities) and those that are enabled (K-K1 identities). The type 1 HARQ-ACK codebook is then generated only for the enabled group, rather than including all K HARQ process identities. This segmentation allows the system to maintain adaptability for enabled processes while reducing signaling overhead by excluding disabled ones from the codebook.
Solution Approach 2:
The patent extracts and removes the disabled HARQ process identities (K1 identities) from the type 1 HARQ-ACK codebook generation process. By taking out these unnecessary identities, the codebook size is reduced from covering all K identities to only covering the K-K1 enabled identities, thereby reducing control signaling overhead while maintaining coverage for actually used HARQ processes.
2Reliability
If type 1 HARQ-ACK codebook includes all enabled HARQ process identities, then completeness of feedback is improved, but device complexity increases
Solution Approach 1:
The patent segments the HARQ process identities into disabled (K1) and enabled (K-K1) groups. The type 1 HARQ-ACK codebook is generated only for the enabled group, maintaining completeness of feedback for actually used processes while reducing device complexity by not having to process and maintain codebook structures for disabled identities.
3Productivity
If base station schedules data for all HARQ process identities, then utilization of HARQ resources is improved, but scheduling complexity increases
Solution Approach 1:
The patent extracts and removes disabled HARQ process identities (K1 identities) from the scheduling consideration. The base station only needs to schedule data for the enabled HARQ processes (K-K1 identities), which simplifies scheduling complexity while maintaining effective utilization of the actually enabled HARQ resources. The disabled identities are simply excluded from both scheduling and feedback generation.
Data Source
AI summary
The present application provides a method and device in a node for wireless communications. A node firstly receives a first information block, the first information block is used to disable K1 HARQ process identities, and the K1 HARQ process identities are a subset of K HARQ process identities; then monitors a first signaling in a first time-frequency resource pool, and receives Q data units according to an indication of the first signaling; and finally transmits a target information block in a first resource set; the first signaling is used to indicate Q HARQ process identities, and the Q data units respectively correspond to the Q HARQ process identities; the target information block comprises M1 bit group(s), the M1 bit group(s) indicates(indicate) whether Q1 data unit(s) in the Q data units is(are) correctly received. The present application optimizes the transmission of uplink feedback to reduce the signaling overhead.