Sidelink DCI Format Distinction for NR V2X Scheduling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current 5G V2X sidelink resource allocation technologies face challenges in distinguishing activation, release, and dynamic retransmission DCI formats, particularly in asynchronous DL and SL carriers, and in determining transmission slots with respect to SFN or DFN for Type 1 configured scheduling.
Innovation Solution
Proposed solutions include using a value of NDI to distinguish activation and release, setting specific HARQ process numbers and bitfields to indicate activation or release, and employing timing calculation formulas to determine sidelink transmission slots, with options for periodic or event-triggered updates from UE to gNB to manage timing differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DCI formats are used for sidelink resource allocation without specific distinction mechanisms, then resource allocation can be performed, but activation and release cannot be distinguished, leading to scheduling errors
Solution Approach 1:
The patent uses different RNTI values (SC-RNTI for activation, SL-CS-RNTI for release) to distinguish between activation and release DCI formats, analogous to using different colors to differentiate meanings. This allows the system to maintain simple DCI formats while achieving reliable distinction between activation and release operations through the scrambling identifier.
2Adaptability or versatility
If asynchronous DL and SL carriers are used to provide scheduling flexibility, then resource allocation adaptability improves, but timing synchronization becomes difficult
Solution Approach 1:
The patent pre-configures timing offset parameters (k1, k2, k3) and SFN/DFN offset values through RRC signaling before actual transmission occurs. This preliminary configuration allows the UE to autonomously determine the correct transmission timing without requiring real-time synchronization, thus maintaining timing accuracy while enabling asynchronous carrier operation.
3Device complexity
If Type 1 configured scheduling is implemented without timing offset configuration, then resource allocation is simplified, but transmission timing determination becomes ambiguous in asynchronous scenarios
Solution Approach 1:
The patent enables the UE to autonomously determine transmission timing by configuring timing offset parameters and SFN/DFN relationships through RRC signaling. The UE uses these pre-configured parameters to self-calculate the correct transmission slot without requiring additional real-time signaling or complex network coordination, thus reducing timing determination delay while maintaining manageable configuration complexity.
Data Source
AI summary
Various embodiments of the present disclosure may be used to determine how activation downlink control information (DCI), release DCI, and dynamic retransmission DCI are distinguished for DCI formats 3_0/3_1 for Mode-1 sidelink resource allocation. Furthermore, in case of asynchronous downlink (DL) and sidelink (SL) carriers, embodiments of the present disclosure may be used to determine how a user equipment (UE) determines transmission slots with respect to system frame number (SFN) or direct frame number (DFN) when activated with Type 1 configured scheduling.