Multi-SIM Power Back-Off Indication Handling
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Solution Overview
Problem
Current telecommunication specifications, such as the 3GPP specification, do not fully support the simultaneous operation of multiple subscriber identity modules (SIMs) in user equipment, leading to issues like missed paging notifications, 'device unavailable' status, and transmission power back-off due to intermodulation and power sustainability challenges.
Innovation Solution
User equipment is equipped with multiple transmitters and SIMs, which send power reduction indications to networks, allowing for power back-off using standardized or internal rules, leveraging Power Management Maximum Power Reduction (P-MPR) or MuSIM-MPR frameworks to manage transmission power effectively across multiple SIMs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If user equipment activates multiple SIMs simultaneously, then communication versatility is improved, but transmission power sustainability deteriorates due to intermodulation and power back-off
Solution Approach 1:
The patent segments the power management for each SIM independently by introducing separate MPR (Maximum Power Reduction) parameters (MPR1, MPR2, MPR3) for different SIM configurations. This allows the system to optimize power allocation for each SIM individually while managing overall power constraints, resolving the contradiction between multi-SIM versatility and power sustainability.
Solution Approach 2:
The patent changes the power management parameters by defining multiple MPR values based on different SIM activation scenarios (single SIM, two SIMs, three SIMs). By dynamically adjusting these parameters according to the number of active SIMs, the system maintains power sustainability while enabling versatile multi-SIM operation.
2Object-affected harmful factors
If user equipment decreases transmission power for multiple SIMs, then interference is reduced, but signal transmission reliability deteriorates
Solution Approach 1:
The patent applies local quality by allowing different power reduction levels for different SIMs based on their specific transmission conditions. Each SIM can have its own MPR parameter optimized for its frequency band and transmission requirements, ensuring that interference is reduced locally without compromising overall signal reliability.
Solution Approach 2:
The patent introduces dynamic power adjustment by allowing the network to configure different MPR parameters based on real-time transmission conditions. The system can dynamically switch between different power reduction scenarios (MPR1, MPR2, MPR3) depending on the number of active SIMs and their respective transmission requirements, maintaining reliability while reducing interference.
3Device complexity
If current telecommunication specifications are followed, then device complexity is reduced, but multi-SIM operation support deteriorates
Solution Approach 1:
The patent achieves universality by creating a generalized power management framework that handles multiple SIM configurations (1, 2, or 3 SIMs) using a unified set of MPR parameters. This universal approach allows the system to support diverse multi-SIM scenarios while maintaining compliance with existing telecommunication specifications, resolving the contradiction between simplicity and versatility.
Data Source
AI summary
User equipment to transmit signals (e.g., concurrently) using multiple SIMs. If the user equipment determines to perform transmission power back-off due to operating using the multiple SIMs (MuSIM operation), the user equipment sends an indication to each network corresponding to each SIM that it is performing the power back-off. If a network supports MuSIM operation, then the user equipment sends an indication that it is performing the power back-off due to MuSIM operation (e.g., an MuSIM Maximum Power Reduction (M-MPR) indication). For such a network, it is assumed that the M-MPR indication would be standardized under an applicable specification. If a network does not support MuSIM operation (e.g., a legacy network), then the user equipment leverages a legacy power back-off indication (e.g., a Power Management Maximum Power Reduction (P-MPR) indication) to indicate to the network that it is performing a power back-off.