Sidelink Carrier Aggregation with UE Capability-Based Carrier Selection
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Solution Overview
Problem
In wireless communication networks, particularly in 5G NR sidelink communications, there are challenges with carrier aggregation (CA) when an RX UE has limited capability to receive sidelink communications from a TX UE, leading to improper communication and compatibility issues between legacy and current UEs.
Innovation Solution
The TX UE is informed of the sidelink capability of the RX UE through various methods, including using TX profiles and anchor channels, to select appropriate carriers for sidelink communications, ensuring compatibility and efficient communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is used for sidelink communication to increase data rate, then productivity is improved, but device complexity increases due to capability matching requirements between TX UE and RX UE
Solution Approach 1:
The TX UE determines the RX UE's capability in advance before initiating sidelink communication. This preliminary capability assessment allows the system to pre-select appropriate carriers and configure carrier aggregation parameters beforehand, avoiding complex runtime negotiations and ensuring compatibility without increasing operational complexity
Solution Approach 2:
The system implements capability feedback mechanisms where the RX UE's capability information is communicated back to the TX UE. This feedback enables the TX UE to adapt its carrier aggregation configuration to match the RX UE's capabilities, resolving the complexity issue by providing clear guidance on compatible configurations
2Adaptability or versatility
If multiple candidate carriers are configured for sidelink communication, then adaptability is improved, but loss of information increases due to capability mismatch between legacy and current UEs
Solution Approach 1:
The system segments the carrier selection process into distinct phases: capability determination, candidate carrier identification, and final carrier selection. This segmentation allows the TX UE to systematically evaluate RX UE capabilities and match them with appropriate carriers from the candidate set, preventing information loss due to capability mismatch
Solution Approach 2:
The system changes the parameter of carrier configuration based on the determined RX UE capability. When a legacy UE is detected, the system adjusts the carrier aggregation parameters to use only single carrier or compatible configurations, ensuring information compatibility while maintaining adaptability through parameter adjustment
Data Source
AI summary
One or more processors are configured to execute instructions that cause a first user equipment (UE) to perform operations in a network that supports multi-carrier carrier aggregation. The operations include: configuring a plurality of candidate carriers for communication with a second UE; determining the second UE as having a capability to perform a sidelink communication with the first UE; selecting one or more sidelink carriers from the plurality of candidate carriers; and communicating with the second UE using the one or more sidelink carriers.