Network Infrastructure Scheduling for V2X Resource Allocation
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Solution Overview
Problem
The coexistence of IEEE 802.11p and LTE-V2X communication technologies in the same unlicensed frequency range leads to performance deterioration due to increased network delays and interference, as both systems attempt to share resources without a fair allocation mechanism.
Innovation Solution
A method for operating network infrastructure and roadside units that involves receiving scheduling requests for sidelink channels, determining and sending scheduling grant messages to allocate sufficient sidelink resources, and broadcasting data only when these resources are free, thereby reducing collision probability and enabling fair resource allocation between the two technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If both IEEE 802.11p and LTE-V2X systems share resources in the same unlicensed frequency range without a fair allocation mechanism, then resource utilization increases, but network delays increase and performance deteriorates due to interference and collisions
Solution Approach 1:
The patent segments the unlicensed frequency range resources by introducing a dedicated sidelink channel that is logically separated from other uplink channels. This segmentation allows LTE-V2X communications to have dedicated resource allocation while other systems continue to use the unlicensed band, reducing interference and improving overall system performance through structured resource division
Solution Approach 2:
The patent introduces a scheduling grant message as an intermediary mechanism that mediates resource allocation between different communication systems. The network infrastructure unit uses this intermediary to coordinate resource usage, allocating sidelink resources fairly among IEEE 802.11p and LTE-V2X systems, thereby preventing collisions and improving performance
2Loss of time
If roadside network units transmit data immediately when channel is free using CSMA/CA, then transmission latency decreases, but collision probability increases when multiple units attempt transmission simultaneously
Solution Approach 1:
The patent applies preliminary action by having the network infrastructure unit pre-allocate sidelink resources and send scheduling grant messages to roadside network units before actual data transmission occurs. This advance resource reservation allows units to transmit immediately when their allocated resources become free, reducing latency while avoiding collisions through pre-coordinated resource distribution
Solution Approach 2:
The patent implements feedback through the scheduling request and scheduling grant message exchange between roadside network units and the network infrastructure unit. This feedback mechanism allows the infrastructure to monitor resource usage and adjust allocations dynamically, ensuring efficient resource utilization while minimizing collisions through coordinated access
Data Source
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AI summary
A method for operating a network-infrastructure network unit of a cell-based wireless communication network is proposed. The method comprises: receiving (202) a scheduling request message for a sidelink channel in an unlicensed frequency range on an uplink channel from a roadside network unit, wherein the scheduling request message indicates a size of the data available for sending on the sidelink channel for the roadside network unit; ascertaining (204) a scheduling grant message on the basis of the size, wherein the scheduling grant message comprises an allocation of a number of sidelink resources of the sidelink channel to the roadside network unit, and wherein the allocated number of sidelink resources is sufficient to send the available data and further data from other roadside network units; and sending (206) the scheduling grant message to the roadside network unit on a downlink channel.