Semi-Persistent Scheduling for V2V Communications
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Solution Overview
Problem
Current LTE communication systems do not adequately support vehicle-to-vehicle (V2V) communications, which require multiple semi-persistent resource assignments to handle different types of messages with varying requirements such as period, size, target range, and transmission latency.
Innovation Solution
A semi-persistent scheduling mechanism is introduced, where a base station determines and assigns resources for V2V communications, using a combination of radio resource control (RRC) grants and downlink control information (DCI) grants, allowing for multiple resource assignments simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LTE communication systems use traditional scheduling mechanisms, then system complexity remains manageable, but they cannot adequately support V2V communications requiring multiple semi-persistent resource assignments
Solution Approach 1:
The patent segments the resource assignment process into multiple independent semi-persistent scheduling assignments, each handling specific V2V message types with different requirements. This allows the system to manage complexity by dividing the overall scheduling function into manageable, specialized components rather than attempting to handle all V2V communications through a single monolithic scheduling mechanism.
Solution Approach 2:
The patent introduces dynamic semi-persistent scheduling mechanisms that can be activated and deactivated based on V2V communication needs. The system dynamically adjusts resource allocations for different message types (safety-critical vs. non-critical) and can modify scheduling parameters in response to changing traffic conditions, enabling adaptability without permanent system complexity.
2Productivity
If multiple semi-persistent resource assignments are implemented for different message types, then communication efficiency for V2V improves, but resource allocation complexity increases
Solution Approach 1:
The patent applies local quality by assigning different resource allocation strategies to different message types based on their specific requirements. Safety-critical messages receive dedicated resources with strict QoS guarantees, while non-critical messages use more flexible allocation. This localized optimization improves overall communication efficiency without requiring complex centralized control for every message type.
Solution Approach 2:
The patent changes scheduling parameters dynamically based on message type characteristics. Different periodicities, resource block allocations, and priority levels are assigned to different V2V message categories. This parameter differentiation enables efficient resource utilization for each message type while maintaining manageable system complexity through standardized parameter sets.
3Loss of time
If semi-persistent scheduling is used for V2V communications, then transmission latency is reduced, but system reliability requirements become more stringent
Solution Approach 1:
The patent implements preliminary action through semi-persistent scheduling where resources are pre-allocated and configured in advance for V2V communications. This preliminary resource reservation eliminates the need for dynamic scheduling decisions at transmission time, significantly reducing latency for time-critical messages while establishing reliable transmission paths beforehand.
Solution Approach 2:
The patent provides beforehand cushioning by establishing redundant resource allocations and backup scheduling configurations for critical V2V messages. Multiple semi-persistent assignments are configured with different parameters to ensure that if one resource allocation fails or becomes unavailable, alternative paths are already prepared, thereby meeting stringent reliability requirements without sacrificing latency performance.
Data Source
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AI summary
The present disclosure enables the assignment of multiple semi-persistent resource assignments at the same time for use in V2V communications. In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE (e.g., a vehicle). The UE may determine at least one resource pattern required for V2V communications. The UE may also send assistance information for the at least one resource pattern to a base station. Further, the UE may receive, from the base station, a response associated with the at least one resource pattern. In an aspect, the response may include an index of approved resource patterns. Further still, the UE may receive, from the base station, an activation grant for a resource assignment for the at least one resource pattern. In an aspect, activation grant may include the index of approved resource patterns being activated.