MUSIM UE Busy Indication Handling for 5G Paging
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Solution Overview
Problem
In 5G wireless communication systems, Multi-Subscriber Identity Module (SIM) User Equipment (UE) faces challenges in efficiently handling paging requests across multiple SIMs, particularly when one SIM is active and another is in an RRC inactive state, leading to potential disruptions in service due to lack of proper busy indication mechanisms.
Innovation Solution
The method involves a Multiple Subscriber Information Module User Equipment (MUSIM UE) that receives paging requests from a second SIM while active on a first SIM, determining criteria for sending a busy indication, and either transmitting or avoiding the busy indication based on factors like processing delay, priority of service, and hardware limitations, using NAS or AS based approaches to manage resource allocation and maintain service quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the MUSIM UE receives paging requests on a second SIM while active on a first SIM, then the UE can maintain connectivity on the first SIM, but the paging requests on the second SIM may be disrupted due to lack of proper busy indication
Solution Approach 1:
The patent implements a feedback mechanism where the MUSIM UE sends a busy indication signal to the network when it is unable to process paging requests on the second SIM due to being active on the first SIM. This feedback loop allows the network to understand the UE's current state and adjust its paging strategy accordingly, resolving the contradiction between maintaining service continuity and handling paging requests efficiently.
Solution Approach 2:
The patent introduces dynamic state management where the UE transitions between different operational states (e.g., RRC_INACTIVE, RRC_CONNECTED) based on the priority and status of paging requests. This dynamic approach allows the system to adapt to changing conditions and allocate resources appropriately, improving both service continuity and paging handling capability.
2Productivity
If the MUSIM UE transmits busy indication to the second network, then the network can avoid sending paging requests during busy periods, but the processing delay and complexity increase
Solution Approach 1:
The patent applies partial action by implementing busy indication transmission only under specific conditions (e.g., when the UE is in RRC_INACTIVE state and receives high-priority paging requests). This selective approach allows the system to improve processing efficiency without incurring the full overhead of continuous busy indication monitoring and transmission, thus reducing unnecessary processing delay.
Solution Approach 2:
The patent utilizes parameter changes in the RRC state machine (transitioning between RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED states) to dynamically adjust the UE's operational characteristics. By changing these parameters based on the presence of active services and incoming paging requests, the system optimizes the balance between processing efficiency and response time.
3Reliability
If the MUSIM UE uses NAS or AS based approaches to manage resource allocation, then the service quality is maintained, but the device complexity increases
Solution Approach 1:
The patent segments the resource allocation management into two distinct approaches: NAS (Non-Access Stratum) based approach for higher-layer resource management and AS (Access Stratum) based approach for lower-layer resource management. This segmentation allows the system to choose the appropriate level of management based on the specific service requirements, maintaining service quality while reducing unnecessary complexity by not implementing both approaches for all scenarios.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The embodiment herein is to provide a method performed by a multiple subscriber information module user equipment (MUSIM UE) in a wireless communication system. The method includes receiving, from a second network, a paging request on a second SIM in a radio resource control (RRC) inactive state, while receiving service on a first SIM from a first network and in case that the MUSIM UE rejects the paging request, and criteria for transmitting a busy indication is met, transmitting the busy indication to the second network in response to the paging request, and in case that the MUSIM UE rejects the paging request, and the criteria for transmitting the busy indication is met, avoid transmitting the busy indication to the second network in response to the paging request.