Dual-SIM MIMO Paging Recovery via Dynamic MTPL Adjustment
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Solution Overview
Problem
Existing wireless communication networks face challenges in managing self-interference during MIMO operations when a user equipment (UE) transitions between active and power saving modes for different subscriber identity modules (SIMs), leading to degraded reception of paging messages due to transmit leakage.
Innovation Solution
The UE dynamically adjusts the maximum transmit power level (MTPL) for one SIM to allow simultaneous UL transmissions and reception of paging messages for another SIM, using a lookup table (LUT) to manage power adjustments based on paging schedules and network conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE transmits UL data for SIM1 in active mode while receiving paging messages for SIM2 in power saving mode, then productivity is improved by maintaining active signaling, but self-interference increases causing degraded reception of paging messages
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the maximum transmit power level (MTPL) for SIM1 based on the scheduled paging occasion for SIM2. The UE modifies transmission parameters (power level, timing) to avoid self-interference while maintaining UL signaling capability. This resolves the contradiction by adapting the transmission parameters to the specific timing and power conditions of the paging reception window.
2Reliability
If the UE reduces MTPL for one SIM to enable paging message reception for another SIM, then reliability of paging reception is improved, but UL transmission quality may deteriorate
Solution Approach 1:
The patent implements dynamics by making the MTPL adjustment temporary and time-bound. The UE dynamically modifies the MTPL only during the specific paging occasion window for SIM2, and restores the original MTPL afterward. This dynamic adjustment ensures reliable paging reception without permanently degrading UL transmission quality, resolving the contradiction through temporary, controlled power reduction.
Solution Approach 2:
The patent applies preliminary action by having the UE determine and prepare the MTPL adjustment in advance based on the paging schedule. The UE proactively identifies when paging occasions occur and pre-configures the appropriate MTPL reduction, ensuring that UL transmissions are automatically adjusted before the paging reception window begins, thus maintaining both reliability and quality.
3Use of energy by moving object
If the UE enters power saving mode for one SIM, then energy consumption is reduced, but the ability to receive paging messages deteriorates when UL transmissions overlap
Solution Approach 1:
The patent resolves this contradiction by changing the power parameter (MTPL) of the active SIM during the paging occasion of the sleeping SIM. This allows the sleeping SIM to receive paging messages reliably while the active SIM continues its normal operations, effectively enabling the power-saving mode to function without sacrificing paging reception reliability.
Data Source
AI summary
Described herein are solutions for multiple input multiple output (MIMO) with maximum transmit power level (MTPL). A user equipment (UE) and/or baseband circuitry can operate with multiple subscriber identity modules (SIMs). The UE can determine a lookup table (LUT) for adjusting an MTPL for a first SIM when a second SIM is to receive a paging message from the network. The adjusted MTPL can be based on one or more factors, such as an operating condition of the UE, a signal strength or condition between the UE and the network, etc. The MTPL for the first SIM can be decreased when the paging message is received and decoded, and then increased thereafter. These and many other features and examples are described herein.