RSU Sidelink Offloading for Vehicle Sensor Data Uplinks
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Solution Overview
Problem
Existing wireless communication systems face bottlenecks in uplink traffic due to asymmetrical performance favoring downlink over uplink, particularly in automotive connectivity, which hampers efficient transmission of high-bandwidth sensor data.
Innovation Solution
Offloading sensor data transmission from cellular uplink to sidelink channels using roadside units (RSUs), facilitated by switching mechanisms based on channel conditions and proximity to RSUs, to optimize data rate and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink traffic is transmitted through cellular channels, then network coverage and connectivity are maintained, but data rate and latency requirements cannot be satisfied due to asymmetrical performance
Solution Approach 1:
The patent introduces roadside units (RSUs) as intermediary devices between vehicles and the cellular network. These RSUs establish direct sidelink communication channels with vehicles, bypassing the congested cellular uplink. The RSU acts as a local relay that receives sensor data from vehicles via PC5 interface and forwards it to the network via Uu interface, thereby resolving the bottleneck in uplink transmission while maintaining network connectivity.
2Productivity
If sensor data is transmitted via cellular uplink, then centralized network control is maintained, but network congestion increases and transmission efficiency decreases
Solution Approach 1:
The patent segments the network traffic by creating separate transmission paths: critical sensor data is routed through decentralized sidelink channels via RSUs, while other traffic continues through cellular channels. This segmentation offloads high-volume sensor data from the cellular uplink, reducing network congestion and improving overall transmission efficiency without losing centralized control capability.
3Speed
If sidelink communication is used for sensor data transmission, then data rate and latency requirements are satisfied, but additional infrastructure (RSUs) is required
Solution Approach 1:
The patent designs RSUs with multi-functionality: they serve as cellular network access points, V2X communication relays, and local data buffers. By consolidating these functions into a single infrastructure element, the system achieves high-speed sidelink communication without requiring separate dedicated devices for each function, thereby reducing overall infrastructure complexity while meeting performance requirements.
Data Source
AI summary
A method for wireless communication by a sidelink (SL) user equipment (UE) includes receiving, from a roadside unit (RSU), one or more signals via an SL channel. The method also includes transmitting, to a network node, a first message indicating a switch from a cellular channel to the SL channel in accordance with one or more of channel conditions of the SL channel, the one or more channel conditions including one or more of a SL reference signal received power (RSRP), a channel busy ratio (CBR), a signal to interference and noise ratio (SINR), channel latency, channel data rate, or a channel quality indicator (CQI). The method further includes transmitting, to the RSU via the SL channel, a second message including sensor data in accordance with switching from the cellular channel to the SL channel.