MIMO Page Recovery via Dynamic MTPL Adjustment in Dual-SIM UEs
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Solution Overview
Problem
Existing wireless communication systems 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, and current solutions often compromise UL transmissions to mitigate this issue.
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 determine power adjustments based on paging schedules and signal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE maintains UL transmissions at maximum power level, then UL communication quality is improved, but self-interference degrades paging message reception
Solution Approach 1:
The patent implements dynamic adjustment of the maximum transmit power level (MTPL) based on operational conditions. The UE monitors whether it is transmitting UL data and whether a paging message is scheduled, then dynamically sets the MTPL to either a first value (when both conditions are true) or a second value (when paging is scheduled but UL transmission should be paused). This dynamic power level adjustment resolves the contradiction by adapting the transmit power to current operational needs, reducing self-interference during paging reception while maintaining high power for UL transmissions when paging is not scheduled.
2Reliability
If the UE pauses UL transmissions to receive paging messages, then paging reception quality is improved, but UL communication continuity is degraded
Solution Approach 1:
The patent changes the power level parameter of UL transmissions based on paging schedule information. Instead of completely pausing UL transmissions, the UE adjusts the MTPL parameter to a lower second value when paging is scheduled, allowing transmissions to continue at reduced power. This parameter change approach maintains UL transmission continuity while reducing self-interference, resolving the contradiction between paging reception reliability and UL transmission productivity.
3Reliability
If the UE uses a lower MTPL during paging occasions, then paging message reception is improved, but UL transmission performance is degraded
Solution Approach 1:
The patent applies preliminary anti-action by proactively reducing the MTPL before paging message reception occurs. The UE determines the paging schedule in advance and preemptively adjusts the maximum transmit power level to a lower second value during paging occasions. This preliminary power reduction prevents self-interference from degrading paging reception quality while minimizing the impact on UL transmission performance, as the power reduction is applied only during specific paging occasions rather than continuously.
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.