RRC Reestablishment Cell Selection via Mobility Measurement Objects
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Solution Overview
Problem
During radio resource control (RRC) connection reestablishment in user equipment (UE), existing procedures suspend user-plane data transfer and are inefficient, particularly when a radio link failure occurs, as they require extensive processing and may not prioritize frequencies associated with pre-configured mobility measurement objects, leading to prolonged data suspension times.
Innovation Solution
The UE is configured to receive a mobility configuration including mobility measurement objects, which allows it to prioritize frequencies associated with these objects when searching for a primary cell (PCell) to reestablish the RRC connection, thereby increasing the likelihood of selecting a conditionally handover (CHO) or T312 configured PCell that can retrieve UE context data from the last serving cell, reducing data suspension time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs extensive processing to search for a PCell during RRC connection reestablishment, then the reliability of connection reestablishment is improved, but the duration of user-plane data transfer suspension increases
Solution Approach 1:
The network performs preliminary action by configuring mobility measurement objects and providing mobility configurations before the RLF occurs. The UE stores this configuration information in advance, so when RLF happens, it can immediately use the pre-configured measurement objects to guide the PCell search, avoiding extensive processing and reducing reestablishment time while maintaining reliability
Solution Approach 2:
The invention changes the search parameter from exhaustive frequency search to targeted search based on mobility measurement object frequencies. By filtering the search space to only frequencies associated with pre-configured measurement objects, the UE reduces processing time while maintaining connection reestablishment reliability through informed search criteria
2Adaptability or versatility
If the UE searches for PCell on all frequencies, then the adaptability of cell selection is improved, but the time required for reestablishment increases
Solution Approach 1:
The invention applies local quality by focusing the search on specific frequencies associated with mobility measurement objects rather than uniformly searching all frequencies. The UE prioritizes frequencies where measurement objects were configured, making the search more targeted and efficient while still adapting to the specific network configuration and conditions
3Speed
If the UE prioritizes frequencies associated with mobility measurement objects, then the speed of reestablishment is improved, but the complexity of determining which frequencies to prioritize increases
Solution Approach 1:
The network performs preliminary action by pre-configuring mobility measurement objects and associating them with specific frequencies before the RLF occurs. The UE stores this mapping information in advance, so when reestablishment is needed, it can directly use the pre-established frequency-to-measurement-object associations without complex real-time analysis, reducing both time and processing complexity
Data Source
AI summary
A user equipment (UE) is configured to receive a mobility configuration from a source cell of a network, wherein the mobility configuration includes at least one mobility measurement object, determine that a radio link failure (RLF) event has occurred on the source cell, searching for a primary cell (PCell) only on frequencies associated with the at least one mobility measurement object to reestablish a radio resource control (RRC) connection and reestablish the RRC connection with the PCell.