Sidelink Capability Intersection for Compatible PC5 Configuration
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Solution Overview
Problem
Existing sidelink connection establishment fails due to UE capability mismatches between transmitting and receiving UEs, leading to AS configuration failures without clear indication of the root cause, and reporting peer UE capabilities can result in configurations that neither UE can comply with.
Innovation Solution
A method and apparatus for obtaining intersection sets of terminal capabilities from both UEs involved in a sidelink connection, enabling a targeted configuration that considers the common capabilities of both UEs, and a network node assists in this process by enquiring and aggregating these capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the TX UE reports its own UE capability to the network, then the PC5 configuration can be generated based on the TX UE's capabilities, but the configuration cannot be fulfilled by the RX UE due to capability mismatch
Solution Approach 1:
The patent introduces an intermediary mechanism where the TX UE reports both its own capabilities and the peer UE's capabilities to the network. The network then acts as a mediator to generate a PC5 configuration that is compatible with both UEs by considering the intersection of their capability sets, thus resolving the capability mismatch problem
Solution Approach 2:
The patent changes the parameter reporting approach by including peer UE capability information in the UE capability report message. This parameter expansion allows the network to make informed configuration decisions that account for both UEs' capabilities, transforming the configuration generation process from single-UE-based to dual-UE-based
2Reliability
If the TX UE reports peer UE capabilities to the network, then the PC5 configuration can be generated considering peer UE capabilities, but the TX UE itself cannot comply with the configuration
Solution Approach 1:
The network serves as an intermediary that receives capability information from both UEs (directly from RX UE and indirectly from TX UE), processes this information to determine the intersection of capabilities, and generates a configuration that ensures compliance for both parties
Solution Approach 2:
The patent performs preliminary capability gathering by having the TX UE report peer UE capabilities before configuration generation. This preliminary action allows the network to pre-assess capability compatibility and generate an appropriate configuration that both UEs can comply with, avoiding subsequent configuration failures
3Device complexity
If the AS configuration failure message does not indicate the root cause, then the message format remains simple, but neither the TX UE nor the network can identify why the connection establishment failed
Solution Approach 1:
The patent implements a feedback mechanism where the AS configuration failure message includes an indication of the root cause (either capability mismatch or other causes). This feedback allows the TX UE and network to identify the specific reason for failure and take appropriate corrective actions, such as adjusting capability reporting or configuration parameters
Data Source
AI summary
There are provided measures for improvement of sidelink connection establishment assistance. Receiving (S61), from a first terminal, a request for a sidelink connection between said first terminal and a second terminal, obtaining (S62) first sidelink related terminal capabilities of said first terminal and second sidelink related terminal capabilities of said second terminal, generating (S63) an intersection set of said first sidelink related terminal capabilities and said second sidelink related terminal capabilities, and setting (S64) a configuration for said sidelink connection based on said intersection set.