HARQ Process Management in NR V2X Sidelink
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Solution Overview
Problem
In NR V2X communication, there is a need for rules governing the hybrid automatic repeat request (HARQ) process, including the maximum number of HARQ processes that can be managed by a V2X terminal and how to manage HARQ processes based on different cast types.
Innovation Solution
A method for performing wireless communication by a first device, which involves receiving physical sidelink control channels (PSCCHs) and physical sidelink shared channels (PSSCHs) from second devices, and performing HARQ processes related to the PSSCHs. The HARQ processes are configured based on the cast type or resource allocation mode related to one HARQ entity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ processes are managed without specific rules for different cast types, then the system is simpler to implement, but communication reliability and latency performance deteriorate
Solution Approach 1:
The patent segments the HARQ process management into distinct configurations for different cast types (unicast, groupcast, broadcast). Each cast type has its own HARQ entity or configuration parameters, allowing tailored optimization for each communication scenario while maintaining overall system reliability without excessive complexity.
Solution Approach 2:
The patent implements dynamic HARQ process management where the number of HARQ processes, process IDs, and configuration parameters are adjusted based on the cast type and resource allocation mode. This dynamic adaptation enables the system to optimize performance for each specific scenario without requiring a completely separate management system for each case.
2Reliability
If the maximum number of HARQ processes is increased to handle more simultaneous transmissions, then communication reliability improves, but device complexity and resource management difficulty increase
Solution Approach 1:
The patent applies different maximum numbers of HARQ processes and configuration parameters locally for each cast type and resource allocation mode. For example, unicast may use a different number of HARQ processes compared to groupcast, optimizing each local context without requiring a uniformly high number across all scenarios, thus balancing reliability with manageable complexity.
3Productivity
If HARQ processes are configured based on cast type and resource allocation mode, then communication efficiency and reliability improve, but the configuration and management overhead increases
Solution Approach 1:
The patent creates a universal HARQ configuration framework that can adapt to multiple cast types and resource allocation modes through a common set of rules and parameters. The HARQ entity is designed to handle different scenarios using a unified management approach, reducing the need for entirely separate configuration systems for each case and thereby managing overhead more effectively.
Data Source
AI summary
A method for performing wireless communication by a first device is provided. The method may include: receiving, from one or more second devices, one or more physical sidelink control channels (PSCCHs); receiving, from the one or more second devices, one or more physical sidelink shared channels (PSSCHs) related to the one or more PSCCHs; and performing one or more hybrid automatic repeat request (HARQ) process related to the one or more PSSCHs with the one or more second devices.