V2X Sidelink Resource Allocation via Distributed Scheduling Modes
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Solution Overview
Problem
Current radio access networks, particularly 3GPP LTE systems, face challenges in efficiently supporting vehicle-to-everything (V2X) communications due to increased network resource strain and communication complexity, especially with the coexistence of unicast and broadcast operations in the same spectrum, which affects link reliability and spectrum efficiency.
Innovation Solution
The introduction of Distributed Scheduling Modes (DSM) such as DSM Category-1 and Category-2a/b, which employ unified channel sensing approaches and control signaling designs to optimize resource allocation and transmission parameters, allowing for seamless coexistence of unicast and broadcast communications, and incorporating receiver-based sensing to improve link reliability and spectrum efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If unicast and broadcast operations are introduced in the same spectrum for V2X communications, then communication versatility and application scope are improved, but network resource strain and communication complexity increase
Solution Approach 1:
The patent segments V2X communications into different scheduling modes (DSM Category 1 for broadcast, DSM Category 2 for unicast/groupcast) with distinct resource allocation mechanisms. This segmentation allows each mode to be optimized independently, managing complexity while supporting multiple communication types in the same spectrum.
Solution Approach 2:
The patent introduces dynamic resource allocation where UEs can switch between different scheduling modes based on traffic requirements. The system dynamically selects between autonomous resource selection (Category 1) and scheduled resource allocation (Category 2), enabling adaptability while managing network complexity through flexible mode transitions.
2Productivity
If distributed scheduling modes are implemented to support both unicast and broadcast, then resource allocation efficiency is improved, but control signaling overhead increases
Solution Approach 1:
The patent applies partial action by implementing receiver-based sensing only for unicast/groupcast communications (DSM Category 2) where it provides value, while broadcast communications (DSM Category 1) use simpler autonomous resource selection. This selective application optimizes resource allocation efficiency without unnecessarily increasing signaling overhead for all communication types.
Solution Approach 2:
Different sensing and resource allocation mechanisms are applied locally to different communication types: autonomous resource selection for broadcast, and scheduled allocation with optional receiver-based sensing for unicast/groupcast. This local differentiation improves overall resource allocation efficiency while minimizing total signaling overhead by applying complex mechanisms only where needed.
3Reliability
If receiver-based sensing is incorporated in distributed scheduling mode category 2, then link reliability is improved, but device complexity and processing requirements increase
Solution Approach 1:
The receiver UE performs self-service by autonomously sensing the channel and providing feedback to the transmitter UE. This self-service mechanism improves link reliability through receiver-based sensing and feedback without requiring complex network-controlled procedures, allowing the receiving device to actively participate in its own link quality optimization.
Solution Approach 2:
The patent implements feedback mechanisms where receiver UEs send sensing results and resource availability information back to transmitter UEs. This feedback loop enables the transmitter to select optimal resources, improving link reliability while managing device complexity through standardized feedback procedures that are only activated when needed for unicast/groupcast communications.
Data Source
AI summary
Systems and methods of providing NR V2V communications are disclosed. Channel sensing is used by both UEs to determine sets of candidate resources, and subsequently select a resource, for PSCCH and PSSCH transmissions. The transmitting UE selects the PSCCH resource and transmits a scheduling request using the PSCCH resource, while the receiving UE selects a PSCCH and the PSSCH resource and transmits a scheduling grant in the PSCCH containing transmission parameters and the PSSCH resource to the transmitting UE. When the scheduling request contains the candidate resources for the PSCCH transmission, the receiving UE uses the intersection of the candidate resources for the PSCCH transmission and the candidate resources for transmission to determine the PSCCH and the PSSCH resource.