Sidelink Resource Reselection for Latency in V2X
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Solution Overview
Problem
In LTE-based V2X communication systems, existing methods fail to efficiently reselect sidelink resources based on latency requirements for ProSe per-packet priority, leading to suboptimal performance in vehicle-to-everything (V2X) communication.
Innovation Solution
A method and apparatus that enable user equipment (UE) to autonomously reselect sidelink resources by configuring a sidelink grant for multiple MAC protocol data units (PDUs), determining data availability for V2X communication, and reselecting resources if the configured grant cannot meet latency requirements, using a resource pool and random selection within specified intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a configured sidelink grant is used for multiple MAC PDU transmissions, then resource allocation efficiency is improved, but latency requirements cannot be met when data becomes available late
Solution Approach 1:
The patent implements dynamic resource reselection by allowing the MAC entity to clear the configured sidelink grant and perform random resource selection when latency requirements cannot be met. This dynamic adjustment enables the system to transition from static grant-based allocation to adaptive random selection based on real-time latency constraints, resolving the contradiction between resource efficiency and latency fulfillment.
Solution Approach 2:
The patent changes the operational parameters of sidelink resource allocation by introducing latency-based decision-making. When the configured grant cannot fulfill latency requirements (determined by comparing data availability time with required transmission time), the system changes from grant-based allocation to random resource selection, thereby adapting parameters to meet timing constraints.
2Reliability
If autonomous resource reselection is implemented, then latency requirements are met, but device complexity increases
Solution Approach 1:
The patent implements self-service by enabling the MAC entity to autonomously determine when reselection is needed and execute the reselection process without external intervention. The MAC entity monitors its own configured grants, evaluates latency fulfillment, and independently performs random resource selection when needed, thereby reducing the need for complex external control mechanisms.
Solution Approach 2:
The patent incorporates feedback mechanisms where the MAC entity continuously monitors whether configured sidelink grants fulfill latency requirements. This feedback loop enables the system to detect when reselection is necessary and trigger appropriate actions, providing a simple yet effective control mechanism that balances reliability improvement with manageable complexity.
3Loss of time
If random resource selection is performed, then latency requirements can be fulfilled, but resource allocation efficiency decreases
Solution Approach 1:
The patent applies partial action by using random resource selection only when necessary (when latency requirements cannot be met with configured grants). The system maintains efficient grant-based allocation as the default and resorts to random selection partially, only for cases where latency constraints violate the configured grant timing, thereby minimizing the efficiency loss while ensuring latency fulfillment when needed.
Data Source
AI summary
Suggested is a novel condition for a media access control (MAC) entity in user equipment (UE) reselecting a sidelink resource in a wireless communication system. The MAC entity of the UE can reselect a sidelink resource when a configured sidelink grant does not satisfy a latency requirement according to ProSe per-packet priority (PPPP). More particularly, configuration is performed by an upper layer so that the MAC entity transmits on the basis of sensing using a resource pool; the MAC entity selects generation of a configured sidelink grant corresponding to transmission of a plurality of MAC protocol data units (PDU); and when data is available in a sidelink traffic channel (STCH) and the configured sidelink grant does not satisfy the latency requirement according to the PPPP, a sidelink resource is reselected.