Multi-SIM User Equipment Timing Coordination for Downlink Collision Prevention
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Solution Overview
Problem
User equipment equipped with multiple SIMs experiences collisions in downlink transmissions from different mobile networks, particularly when operated by different communication operators, leading to reception failures.
Innovation Solution
The user equipment coordinates downlink transmission timings by receiving configuration information from one network to avoid collisions, either by configuring non-execution timings or identifying priority networks, and requesting modifications to paging reception occasions when overlaps occur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If user equipment is registered with multiple mobile networks using multiple SIMs, then the user equipment can utilize mobile communication services from multiple networks simultaneously, but downlink transmission collisions occur between networks
Solution Approach 1:
The user equipment performs preliminary actions by receiving configuration information from a first mobile network before collisions occur, and proactively transmits identification information to a second mobile network to prevent downlink transmission collisions. This advance coordination ensures reliable reception from both networks without waiting for conflicts to arise.
2Reliability
If the user equipment receives configuration information from the first mobile network to avoid downlink transmission collisions, then reception reliability is improved, but additional signaling overhead is introduced
Solution Approach 1:
The solution extracts only the essential identification information about timing configurations from the complex coordination problem. Instead of exchanging extensive coordination messages between networks, the user equipment simply transmits compact identification information that enables the second network to adjust its downlink timing, thereby reducing signaling overhead while maintaining reliability.
3Device complexity
If the user equipment identifies priority mobile network among multiple networks, then timing coordination is simplified, but service quality from non-priority networks may be degraded
Solution Approach 1:
The user equipment applies partial coordination by transmitting identification information only to non-priority networks. The priority network maintains full control without modifications, while non-priority networks make partial adjustments based on the transmitted identification information. This selective approach simplifies coordination complexity while preserving service quality through targeted timing adjustments.
Data Source
AI summary
A user equipment according to an aspect is registered with a first mobile network by using a first subscriber identity module (SIM) and registered with a second mobile network using a second SIM. The user equipment includes a processor. The processor executes a process of receiving, from the first mobile network, configuration information for configuring either a non-execution timing for not executing downlink transmission from the first mobile network to the user equipment or an execution timing for executing the downlink transmission. The processor executes a process of transmitting, to the second mobile network, identification information for identifying a timing configured according to the configuration information.