Random Access CSI Reporting with UE Capability Indication
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Solution Overview
Problem
Wireless communication networks face challenges in efficiently implementing channel state information (CSI) reporting during the random access (RA) procedure due to varying UE capabilities, leading to inappropriate treatment of UEs with different CSI reporting capabilities.
Innovation Solution
A method and apparatus that enable CSI reporting from a terminal device to a network node during the RA procedure based on the UE's capability, using preambles, ROs, identifiers, and RA types to indicate CSI reporting, allowing selective and conditional CSI transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the BS requests an early CSI report from the UE during RA procedure, then DL link adaptation can be improved, but the UE may not respond if it lacks CSI reporting capability during RA
Solution Approach 1:
The patent changes the parameter of CSI reporting capability by introducing a new RA type (RA type 2) that specifically indicates UE capability to report CSI during RA procedure. This parameter change allows the BS to identify capable UEs and request CSI reports only from them, preventing loss of information while maintaining improved DL link adaptation.
Solution Approach 2:
The patent introduces an intermediary mechanism - the RA type indicator - that mediates between the BS's CSI reporting request and the UE's capability. This intermediary allows the BS to indirectly identify UE capability without direct capability signaling, enabling reliable CSI reporting only from capable UEs.
2Device complexity
If the BS treats all UEs uniformly during RA procedure, then device complexity is reduced, but UEs with different CSI capabilities are not treated appropriately
Solution Approach 1:
The patent applies local quality by differentiating treatment based on UE capability. Instead of uniform treatment, the BS now applies different RA types locally to different UEs - RA type 1 for UEs without CSI capability and RA type 2 for UEs with CSI capability. This allows appropriate treatment of different UE capabilities while maintaining relatively simple BS logic through standardized type indicators.
Solution Approach 2:
The patent segments the RA procedure into two distinct types based on UE capability. This segmentation divides the homogeneous RA procedure into heterogeneous paths, allowing the BS to appropriately handle UEs with different CSI reporting capabilities while maintaining manageable complexity through clear type differentiation.
3Reliability
If the UE always reports CSI during RA procedure, then DL link adaptation is improved, but resource overhead increases for UEs that don't need it
Solution Approach 1:
The patent applies partial action by enabling CSI reporting only when necessary - specifically for UEs with RA type 2 capability. Instead of all UEs reporting CSI (excessive action) or no UEs reporting (insufficient action), the system implements partial reporting based on capability, reducing unnecessary signaling overhead while maintaining DL link adaptation where beneficial.
Solution Approach 2:
The patent uses parameter changes to control CSI reporting behavior. By introducing the RA type parameter that indicates UE capability, the system dynamically adjusts whether CSI reporting occurs. This parameter-driven approach ensures CSI is reported only when needed, optimizing the balance between DL link adaptation improvement and signaling overhead reduction.
Data Source
AI summary
Various embodiments of the present disclosure provide a method for random access. The method which may be performed by a terminal device comprises determining whether the terminal device is capable of reporting channel state information to a network node in a random access procedure. In accordance with an exemplary embodiment, the method further comprises transmitting an uplink message to the network node in the random access procedure to indicate a result of the determination.