Speed-Adaptive Transmission Configuration for Reliable V2V Control Channels
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Solution Overview
Problem
High-speed travel of user equipment (UE) in vehicle-to-vehicle communication can result in unreliable reception of control channels and increased decoding complexity due to rapidly changing channel conditions, leading to challenges in reliable device-to-device communication.
Innovation Solution
The UE determines its travel speed and adjusts the transmission configuration by increasing redundancies in channel transmissions, such as using lower MCS values, more RBs, and higher retransmissions for high-speed scenarios, and divides available SA resources into sets based on transmission configurations to improve decoding reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the UE travels at high speed, then the communication coverage and data transmission capability are improved, but the channel conditions change rapidly causing unreliable reception of control channels
Solution Approach 1:
The patent applies dynamics by making the transmission configuration adaptive to the UE's travel speed. The system dynamically adjusts parameters such as modulation and coding scheme (MCS), resource block allocation, and retransmission settings based on real-time speed information. This allows the control channel transmission to optimize reliability under varying high-speed conditions rather than using a fixed configuration.
Solution Approach 2:
The patent changes key transmission parameters including MCS index, number of resource blocks, and retransmission counts based on the determined travel speed. By modifying these parameters dynamically, the system maintains reliable control channel reception even when the UE is moving at high speeds, directly addressing the reliability issue caused by rapid channel condition changes.
2Reliability
If the transmission configuration is adjusted for high-speed scenarios, then the control channel decoding reliability is improved, but the decoding complexity increases
Solution Approach 1:
The patent applies preliminary action by having the UE determine its travel speed and select an appropriate transmission configuration before actually transmitting the control channel. This preconfiguration approach, guided by speed information and pre-defined configuration sets, reduces the complexity during the actual decoding process by eliminating the need to evaluate multiple complex scenarios in real-time.
Solution Approach 2:
The system dynamically selects from pre-defined transmission configuration sets based on the UE's speed category (e.g., low, medium, high speed thresholds). This dynamic selection mechanism simplifies the decoding process compared to handling all possible configurations manually, as the receiver only needs to process configurations relevant to the current speed condition.
3Measurement precision
If more resource blocks and retransmissions are used, then the channel estimation accuracy is improved, but the transmission time and resource consumption increase
Solution Approach 1:
The patent changes transmission parameters including the number of resource blocks allocated for channel estimation and the retransmission count based on the UE's travel speed. For high-speed scenarios, the system increases these parameters to improve estimation accuracy, while for lower speeds, it uses fewer resources, thereby optimizing the time-resource trade-off dynamically rather than using fixed high-accuracy settings always.
Data Source
AI summary
During device-to-device communication between two devices, a communication transmitted from a first UE to a second UE may not be reliably received by the second UE if the first UE is traveling at high speed. Therefore, a travel speed of a transmitting UE may be considered in determining a transmission configuration. According to an aspect, the UE may determine a travel speed of the UE. The UE may determine, based on the travel speed of the UE, a transmission configuration of the UE for device-to-device communication. The UE may transmit the device-to-device communication based on the transmission configuration.