NR V2X Sidelink Grant Deactivation With Valid PUCCH Feedback Timing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing resource allocation for sidelink (SL) communication, particularly in scenarios involving vehicle-to-everything (V2X) communications, where the need for enhanced reliability and low latency is increasing, and there is a lack of clear methods for determining valid physical uplink control channel (PUCCH) resources during configured grant (CG) deactivation.
Innovation Solution
A method and device for managing SL communication resources by receiving DCI for activating and deactivating configured grants, transmitting MAC control elements, and determining valid PUCCH resources based on SL resources allocated before confirmation, enabling efficient SL communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If configured grant resources are deactivated through DCI, then resource allocation efficiency is improved, but determining valid PUCCH resources becomes complex and ambiguous
Solution Approach 1:
The patent applies preliminary action by pre-defining the validity period of PUCCH resources in advance through RRC configuration. The network configures a validity duration for PUCCH resources associated with configured grants, and the UE autonomously determines resource validity based on this pre-established configuration and the current time, eliminating the need for complex dynamic signaling during CG deactivation.
2Adaptability or versatility
If SL communication resources are dynamically managed, then communication flexibility is improved, but latency in resource release and confirmation increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the validity duration of PUCCH resources through RRC signaling before CG deactivation occurs. This allows the UE to autonomously and immediately determine resource validity upon deactivation without waiting for network confirmation, reducing latency while maintaining flexibility.
Solution Approach 2:
The patent applies self-service by enabling the UE to autonomously determine PUCCH resource validity based on pre-configured parameters and current timing information. The UE independently performs the validity check without requiring network-side confirmation or additional signaling, thereby reducing latency and enabling self-contained resource management.
3Productivity
If PUCCH resources are cleared immediately upon CG deactivation, then resource utilization is improved, but HARQ feedback reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-defining the validity period of PUCCH resources through RRC configuration. This allows the system to automatically and reliably clear resources after the predetermined validity period expires, ensuring both timely resource release for improved utilization and reliable HARQ feedback during the valid period.
4Measurement precision
If network confirms each CG deactivation through MAC CE, then control accuracy is improved, but signaling overhead and processing delay increase
Solution Approach 1:
The patent applies self-service by enabling the UE to autonomously determine PUCCH resource validity based on pre-configured parameters and current timing. This eliminates the need for network-side MAC CE confirmation, reducing signaling overhead and processing delay while maintaining control accuracy through autonomous UE decision-making.
Solution Approach 2:
The patent extracts the confirmation function from the network side and relocates it to the UE side. By taking out the MAC CE confirmation mechanism and replacing it with autonomous UE determination based on pre-configured validity periods, the system reduces signaling overhead and delay while maintaining control accuracy.
Data Source
Figure 1
Figure 2
Figure 3(a)~3(d)
AI summary
Provided are a method by which a first device performs wireless communication, and an apparatus supporting same. The method may comprise the steps of: receiving, from a base station, first downlink control information (DCI) for activating a configured sidelink (SL) grant, wherein the first DCI includes information related to a physical uplink control channel (PUCCH) resource for reporting SL hybrid automatic repeat request (HARQ) feedback to the base station; transmitting a medium access control protocol data unit (MAC PDU) to a second device through a physical sidelink shared channel (PSSCH) on the basis of the configured SL grant; receiving, from the base station, second DCI for deactivating the configured SL grant; transmitting, to the base station, an SL confirmation medium access control (MAC) control element (CE) in response to the second DCI; and determining whether the PUCCH resource related to at least one SL resource allocated by the configured SL grant is valid on the basis of the time at which the SL confirmation MAC CE was transmitted.