Sidelink PSFCH Scheduling for Deterministic HARQ-ACK Timing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the SL-U system, the existing NR standard fails to account for varying LBT success on multiple PSFCHs, leading to uncertainty in determining the time unit for HARQ-ACK information transmission, which affects reliability and complicates network device monitoring.
Innovation Solution
Introduce additional PSFCHs in different slots for a single transmission resource, allowing the terminal and network devices to determine a unique reference time unit based on scheduling information, ensuring synchronized HARQ-ACK information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple PSFCHs correspond to a same transmission resource in SL-U system, then the transmitting device can receive HARQ-ACK messages, but the time unit for HARQ-ACK information transmission becomes uncertain and monitoring complexity increases
Solution Approach 1:
The patent segments the PSFCH resources into multiple distinct physical channels (first PSFCH, second PSFCH, third PSFCH) corresponding to different transmission resources, each with its own dedicated time unit for HARQ-ACK feedback. This segmentation resolves the ambiguity by establishing clear, separate time units for each PSFCH, thereby maintaining reliable HARQ-ACK reception while simplifying monitoring through deterministic time alignment.
2Reliability
If multiple PSFCHs correspond to a same transmission resource, then HARQ-ACK feedback is ensured, but the time unit for terminal and network device synchronization becomes unclear
Solution Approach 1:
The patent applies preliminary action by pre-configuring the time units for each PSFCH based on the scheduling information before the actual HARQ-ACK transmission occurs. The network device determines the time unit for each PSFCH in advance (first time unit for first PSFCH, second time unit for second PSFCH, third time unit for third PSFCH), ensuring that both terminal and network devices are synchronized on the exact time units before transmission begins, thereby eliminating time synchronization uncertainty.
3Reliability
If one transmission resource is associated with multiple PSFCHs, then reception of HARQ-ACK is improved, but the scheduling information processing becomes more complex
Solution Approach 1:
The patent introduces scheduling information as an intermediary that mediates between the multiple PSFCHs and the time unit determination process. The scheduling information contains explicit indications for each PSFCH's corresponding time unit, serving as a mediator that translates the complex multi-PSFCH configuration into clear, actionable time unit assignments for both terminal and network devices, thereby simplifying processing while maintaining reliable HARQ-ACK reception.
Data Source
AI summary
A communication method and apparatus, and a computer readable storage medium are provided. The communication method includes: receiving scheduling information, wherein the scheduling information indicates a transmission resource of a sidelink, and the transmission resource corresponds to at least two Physical Sidelink Feedback CHannels (PSFCHs); and determining a reference time unit based on the at least two PSFCHs, wherein the reference time unit is used to determine a sending time unit of Hybrid Automatic Repeat reQuest-ACKnowledgement (HARQ-ACK) information, and the HARQ-ACK information indicates a reception status of the sidelink.