Wireless RRC Transaction ID Handling for Reliable PCell Mobility
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Solution Overview
Problem
In wireless communication systems, the handling of transaction identifiers (IDs) during mobility procedures, such as PCell and PSCell changes, can lead to inefficiencies and inconsistencies, particularly in 3GPP LTE and NR systems, affecting the reliability and efficiency of communication processes.
Innovation Solution
A method and apparatus for user equipment (UE) and network nodes to manage transaction IDs during mobility procedures by setting and transferring RRC reconfiguration messages without transaction IDs, enabling seamless PCell and PSCell mobility operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transaction ID is set for RRC reconfiguration message during mobility procedure, then message tracking and response matching is enabled, but inconsistency and reliability issues occur during PCell and PSCell mobility operations
Solution Approach 1:
The patent extracts the transaction ID from the RRC reconfiguration message specifically for RRC reconfiguration complete messages during mobility procedures. By removing the transaction ID field from these specific messages, the patent eliminates the source of inconsistency while maintaining the integrity of the mobility procedure. This selective extraction resolves the contradiction by preventing transaction ID-related errors without affecting other message tracking functions.
Solution Approach 2:
Instead of using transaction ID to track and match messages (the conventional approach), the patent inverts the approach by explicitly excluding transaction ID from RRC reconfiguration complete messages during mobility. This inversion recognizes that the presence of transaction ID in these specific messages causes more harm than good, and solving the problem requires removing rather than adding the tracking mechanism.
2Ease of operation
If transaction ID is included in RRC messages during mobility, then message-response matching is possible, but system complexity and processing overhead increase
Solution Approach 1:
The patent extracts the transaction ID requirement specifically from RRC reconfiguration complete messages during mobility procedures. By removing this field only where it causes problems, the patent reduces device complexity and processing overhead associated with transaction ID handling while preserving message tracking capability through alternative mechanisms inherent in the mobility procedure architecture.
3Productivity
If transaction ID is set for all RRC messages, then comprehensive message tracking is achieved, but inefficiencies and inconsistencies arise in mobility procedures
Solution Approach 1:
The patent applies local quality by differentiating the treatment of transaction ID based on the specific message type and procedure context. Rather than uniformly applying transaction ID to all RRC messages, the patent selectively excludes it from RRC reconfiguration complete messages during mobility procedures. This localized approach optimizes both efficiency and reliability by applying transaction ID only where it is beneficial and removing it where it causes inconsistencies.
Data Source
AI summary
The present disclosure relates to a transaction identifier (ID) handling in wireless communications. According to an embodiment of the present disclosure, a user equipment (UE) may determine whether primary cell (PCell) has changed when performing optimized mobility, and when the PCell has changed to new PCell, the UE may inform mobility complete to network via a radio resource control (RRC) message which does not require setting of a transaction identifier (ID).