Sidelink Resource Indication Using Candidate Sets for Hidden Nodes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the New Radio (NR) system, the sidelink (SL) communication interface faces issues of hidden node collisions and exposed node resource underutilization due to inadequate resource allocation, leading to interference and inefficient resource utilization in mode 2(a) of the PC5 interface.
Innovation Solution
A method where a first terminal device determines and transmits X sets of candidate single-time-unit resources to a second terminal device, ensuring these resources are either avoided by hidden nodes or utilized by exposed nodes, using various signaling methods like second-stage SCI, MAC CE, or RRC signaling to improve resource selection accuracy and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If terminal device selects time-frequency resources based on sensing in mode 2(a), then resource allocation flexibility is improved, but hidden node collisions occur causing interference
Solution Approach 1:
The patent applies preliminary action by having terminal devices perform sensing and determine candidate resources before actual transmission. The first terminal device determines X sets of candidate single-time-unit resources based on sensing results, then transmits resource indication information to the second terminal device in advance, allowing the second device to select resources before hidden node collisions occur.
Solution Approach 2:
The patent implements feedback through the sensing mechanism where terminal devices monitor the channel, detect resource usage by other devices, and adjust their resource selection accordingly. The first terminal device uses sensing feedback to determine which candidate resources are available and transmits this information to the second terminal device, creating a closed-loop system that prevents hidden node collisions.
2Object-affected harmful factors
If terminal device avoids using resources used by exposed nodes, then interference is reduced, but resource utilization decreases
Solution Approach 1:
The patent applies local quality by differentiating resource sharing behavior based on the specific scenario. For exposed nodes, the patent allows resource sharing (different from hidden node avoidance) when the receivers are different, thereby improving resource utilization without causing harmful interference. The system selectively applies resource protection only where necessary (hidden nodes with same receiver) while allowing efficient sharing where safe (exposed nodes with different receivers).
Data Source
AI summary
Embodiments of this application provide a resource indication information transmission method, a device, and a system, which are applicable to fields such as internet of vehicles, intelligent connected vehicle, assisted driving, and intelligent driving. In an example method, a first terminal device determines X sets of candidate single-time-unit resources based on a number of sub-channels to be used by a second terminal device for physical sidelink shared channel (PSSCH) and/or physical sidelink control channel (PSCCH) transmission, and indicates, to the second terminal device, K candidate single-time-unit resources whose time domain locations are in a first time window in the X sets of candidate single-time-unit resources. The second terminal device determines a first time-frequency resource based on the K candidate single-time-unit resources. The first time window is a time window included in a selection window corresponding to at least one of the X sets of candidate single-time-unit resources.