V2X Resource Pool Allocation for Latency and Capacity
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Solution Overview
Problem
Current LTE Rel-12/13 D2D communication designs fail to meet the stringent requirements of V2X services, particularly in terms of latency, capacity, device density, packet size, coverage, and varying traffic features, necessitating enhancements in resource allocation and pool design to support high mobility and diverse V2X scenarios.
Innovation Solution
The proposed solution involves redesigning the resource pool allocation mechanism for V2X services by allowing flexible association between SA and data pools, introducing UE-specific SA cycles, and employing Frequency Division Multiplexing (FDM) to enhance latency and resource utilization, while updating system information blocks to support V2X service configurations and UE side information delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If Rel-12/13 D2D communication design is used as base, then implementation complexity is reduced and market timing is met, but latency requirement of 100ms cannot be satisfied
Solution Approach 1:
The resource pool is segmented into multiple sub-pools with different periodicities, where some sub-pools have shorter periodicities to meet latency requirements while others maintain longer periodicities for efficiency. This segmentation allows the system to satisfy the 100ms latency requirement without completely redesigning the D2D communication framework.
Solution Approach 2:
The patent introduces dynamic resource pool configuration where the eNB can flexibly adjust resource pool parameters including periodicity, subframe offset, and resource allocation patterns based on real-time V2X service requirements. This dynamic adaptation enables the system to meet varying latency demands while maintaining implementation efficiency.
2Productivity
If resource pool periodicity is increased to improve resource utilization efficiency, then resource efficiency improves, but latency requirement of 100ms cannot be met
Solution Approach 1:
The resource pool is divided into multiple sub-pools with different periodicities. Some sub-pools use longer periodicities for high resource efficiency, while other sub-pools use shorter periodicities to meet latency requirements. This segmentation resolves the contradiction by allowing different parts of the resource pool to optimize for different priorities.
Solution Approach 2:
The patent changes the periodicity parameter of resource pools dynamically based on service requirements. By configuring multiple resource pools with different periodicity values, the system can switch between efficiency-oriented and latency-oriented configurations as needed.
3Loss of time
If multiple resource pools with different periodicities are configured, then latency and efficiency requirements are both met, but signaling overhead increases
Solution Approach 1:
The patent uses a universal resource pool configuration mechanism where a single set of configuration parameters can describe multiple resource pools with different periodicities. The configuration includes a base periodicity and a set of offset values that define multiple sub-pools, reducing the need for separate configuration messages for each pool.
Solution Approach 2:
The resource pool configuration is structured in a nested manner where a parent resource pool configuration contains child sub-pool configurations. This hierarchical structure allows compact representation of multiple resource pools with different periodicities, reducing signaling overhead by sharing common parameters at higher levels.
4Reliability
If D2D communication is used for V2V, then public safety requirements are met, but device density capacity is insufficient for hundreds of vehicles per cell
Solution Approach 1:
The resource pool is segmented into multiple sub-pools that can be allocated to different V2X service types. This segmentation allows the system to support both public safety V2V communication and high-density vehicular communication simultaneously by assigning appropriate resource pools to different service categories.
Solution Approach 2:
The patent introduces an additional dimension of resource allocation by configuring multiple resource pools with different periodicities and spatial characteristics. This multi-dimensional resource allocation enables the system to handle both low-density public safety scenarios and high-density vehicular scenarios by selecting appropriate resource pools based on service requirements.
Data Source
Figure 1~2
Figure 3(a)~3(b)
Figure 4
AI summary
User Equipment (UE) receives a system information block for V2X service, and transmits V2X related UE side information. The system information block includes at least an information element indicating resource pool configuration for V2X service.