RRC Processing Delays in Multi-SIM User Equipment
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Solution Overview
Problem
Current LTE and NR specifications do not adequately address radio resource control (RRC) processing delays for multi-SIM user equipment (UEs), as they do not account for interruptions from secondary SIMs, leading to potential delays in RRC reconfiguration procedures and impacting key performance indicators and user experience.
Innovation Solution
Implementing a method where the network is informed of a UE's multi-SIM mode, adjusting the expected RRC processing delay by considering the number of SIMs and operational modes, and allowing additional time for procedures associated with secondary SIMs, thereby ensuring predictable processing times and maintaining performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multi-SIM UEs process RRC procedures simultaneously for multiple SIMs, then service coverage and versatility are improved, but RRC processing delay increases and reliability deteriorates
Solution Approach 1:
The network pre-configures extended RRC processing time parameters for multi-SIM UEs before RRC reconfiguration procedures begin. This preliminary configuration allows the UE to inform the network of its multi-SIM mode, enabling the network to allocate appropriate time resources in advance, thus avoiding delays caused by simultaneous processing of multiple SIMs.
2Adaptability or versatility
If multi-SIM UEs process RRC procedures simultaneously for multiple SIMs, then service coverage is improved, but procedure completion reliability worsens
Solution Approach 1:
The RRC processing procedure is segmented into distinct time phases: a first time phase for initial RRC message processing, and a second extended time phase for handling interruptions from secondary SIMs. This segmentation allows the primary SIM's RRC procedure to be completed reliably within the first phase, while the second phase accommodates multi-SIM operations without compromising overall procedure completion reliability.
3Speed
If standard RRC processing time is applied to multi-SIM UEs, then processing speed is maintained, but service quality deteriorates due to interruptions
Solution Approach 1:
The RRC processing time parameter is made dynamic rather than static. The network configures different time parameters based on the UE's operational mode: a first RRC processing time for single-SIM or primary SIM operations, and an extended second RRC processing time when multi-SIM mode is detected. This dynamic adjustment maintains processing speed for standard operations while ensuring service quality when interruptions occur.
Data Source
AI summary
Determining RRC processing delays for multi-subscriber identify module (MSIM) user equipments (UEs) may include decoding a capabilities message from a UE that indicates the UE is an MSIM UE that includes at least a first SIM and a second SIM. A communication for the first SIM of the UE may be encoded. The communication may be configured to cause the UE to perform a radio resource control (RRC) procedure. A transmission request received from the UE may be decoded. The transmission request may be associated with the RRC procedure. In response to receiving the transmission request, an uplink (UL) gram may be scheduled for the first SIM of the UE.