SL HARQ Multiplexing via Orthogonal Time Windows
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing SL HARQ of NR Rel-16 V2X does not support multiplexing, which is crucial for future V2X scenarios, leading to inefficiencies and increased complexity and costs in wireless communication systems.
Innovation Solution
A method for implementing SL HARQ multiplexing by using orthogonal time windows and bit blocks to transmit HARQ-ACKs, avoiding the need for Downlink Assignment Index (DAI) in SCI and minimizing miss detection impacts on HARQ codebook size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SL HARQ multiplexing is implemented, then spectral efficiency and resource utilization are improved, but system complexity and implementation difficulty increase
Solution Approach 1:
The patent segments the HARQ-ACK feedback into multiple codebooks (first HARQ codebook and second HARQ codebook), where each codebook handles different types of HARQ processes. This segmentation allows independent optimization and management of different HARQ feedback streams, improving spectral efficiency while managing system complexity through modular organization.
Solution Approach 2:
The patent introduces a new dimension for HARQ multiplexing by utilizing different time windows (first time window and second time window) and associating them with different HARQ codebooks. This dimensional approach enables simultaneous transmission of multiple HARQ feedbacks without increasing baseband processing complexity, as the multiplexing is achieved through time-window association rather than complex signal processing.
2Productivity
If SL HARQ multiplexing is implemented, then resource utilization is improved, but overhead and signaling requirements increase
Solution Approach 1:
The patent employs self-service mechanisms where the terminal autonomously determines which HARQ codebook to use based on pre-configured associations between time windows and codebooks. The network side also autonomously determines the appropriate codebook for receiving feedback. This eliminates the need for additional dynamic signaling to coordinate HARQ multiplexing, as both sides independently make decisions based on pre-established rules, thereby improving resource utilization without increasing overhead.
3Productivity
If SL HARQ multiplexing is implemented, then communication efficiency is improved, but implementation complexity and cost increase
Solution Approach 1:
The patent implements preliminary action by pre-configuring the associations between time windows and HARQ codebooks before actual HARQ feedback transmission. The terminal and network side both have pre-established knowledge of which codebook to use for which time window, eliminating the need for complex real-time decision-making and reducing implementation complexity while maintaining high communication efficiency.
Solution Approach 2:
The patent changes the parameter of time window association to determine HARQ codebook selection. By varying the time window parameter (first time window vs. second time window), the system dynamically selects appropriate HARQ codebooks without requiring complex processing logic. This parameter-based approach simplifies implementation while enabling efficient HARQ multiplexing.
Data Source
AI summary
A method and device in a node used for wireless communications. A first node receives a first signaling, receives a first signal in a first time window, and transmits a first bit block in a first radio resource block. The first signaling is used for indicating configuration information for the first signal; the first time window is one of M time windows, and any two time windows of the M time windows are orthogonal, M being a positive integer greater than 1. The first radio resource block belongs to a target time window in time domain, and any of the M time windows is associated with the target time window. The present method not only saves the dynamic signaling overhead but also avoids the impact of miss detection.