Sidelink Communication Carrier Selection Through Receiver Capability Feedback
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Solution Overview
Problem
Existing NR V2X sidelink communication systems face challenges in carrier frequency support due to varying radio access capabilities among UEs, leading to inefficiencies in data transmission and reception, particularly in unlicensed spectrum and mode 1 scenarios where the transmitting UE is unaware of the receiving UE's capabilities.
Innovation Solution
A method involving the exchange of radio access capability messages between transmitting and receiving UEs, or via a network node, to configure frequency resources for data transmission, ensuring that data is sent using frequencies supported by the receiving UE, thereby enabling carrier aggregation and improving data rate and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transmitting UE uses carrier aggregation with multiple frequency resources to increase data rate, then the data rate is improved, but the reliability deteriorates because the transmitting UE is unaware of the receiving UE's capability and may select frequencies that the receiving UE cannot support
Solution Approach 1:
The receiving UE performs preliminary action by transmitting its radio access capability information to the transmitting UE before actual data transmission begins. This capability information includes the set of frequency resources that the receiving UE can support, allowing the transmitting UE to make informed carrier selection decisions in advance and avoid selecting frequencies that would not be supported by the receiving UE.
Solution Approach 2:
The system implements feedback mechanism where the receiving UE provides feedback information about its supported frequency resources to the transmitting UE. This feedback loop ensures that the transmitting UE adjusts its carrier aggregation configuration based on actual receiving capability, thereby maintaining both high data rate and reliable transmission.
2Device complexity
If the transmitting UE autonomously selects carriers without knowing RX UE capabilities, then the device complexity is reduced, but the adaptability deteriorates because the system cannot adapt to different receiving UE capabilities
Solution Approach 1:
The receiving UE acts as an intermediary by providing its capability information to the transmitting UE. This intermediary role enables the transmitting UE to adapt its carrier selection behavior without significantly increasing its own complexity, as the capability information is provided by the receiving UE rather than requiring the transmitting UE to autonomously detect and adapt to different receiving capabilities.
Solution Approach 2:
The system achieves universality by enabling the transmitting UE to handle multiple receiving UE capabilities through a standardized capability information exchange mechanism. The transmitting UE uses a unified approach of receiving capability information and configuring carrier aggregation based on that information, making it adaptable to different receiving UE capabilities without requiring separate handling mechanisms for each capability type.
Data Source
AI summary
A technique for transmitting and receiving data is described. As to a method aspect performed by a transmitting radio device for transmitting data to a receiving radio device, at least one of a radio access capability message indicative of a set of frequency resources supported by the receiving radio device and a configuration message indicative of a set of frequency resources configured for transmitting to the receiving radio device is received. The data is transmitted to the receiving radio device using at least one frequency resource from a set of frequency resources configured based on at least one of the received radio access capability message and the received configuration message.