Dual-USIM Uplink Power Headroom Reporting Without Timer Delay

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Solution Overview

Problem

Existing methods for Multiple Universal Subscriber Identity Module (MUSIM) capable user equipment (UE) devices with two uplink transmitters (UL Tx) require waiting for PHR configuration timers to expire before reporting power headroom changes, leading to unnecessary delays and inefficient resource utilization due to continued scheduling by the base station despite resource unavailability.

Innovation Solution

The UE transmits a power headroom report (PHR) to the first PLMN without waiting for active PHR configuration timers to expire when activating a second Subscriber Identity Module (SIM) for data transmission, thereby allowing more responsive scheduling adjustments by the network.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the UE waits for PHR configuration timers to expire before reporting power headroom changes, then the reporting follows standard protocol procedures, but this causes unnecessary delays and inefficient resource utilization

Engineering Contradiction:

Improveprotocol complianceVSAvoidPHR reporting delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The UE transmits the PHR immediately when power headroom changes occur, performing the reporting action before the PHR configuration timers would normally expire. This preliminary action eliminates unnecessary waiting time while still maintaining protocol compliance by ensuring the report is sent within acceptable parameters.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically adjusts PHR reporting timing based on actual power headroom changes rather than strictly following fixed timer expiration schedules. When power headroom changes occur, the UE immediately reports these changes, making the reporting mechanism adaptive and responsive to real-time conditions.

Inventive Principle:

Principle #15Dynamics

2Productivity

If the base station continues scheduling data according to existing PHR information, then scheduling decisions are made with available data, but this leads to inefficient resource utilization when the UE lacks necessary resources

Engineering Contradiction:

Improvescheduling efficiencyVSAvoidnetwork resource waste

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The UE provides timely feedback about power headroom changes by transmitting PHR immediately when conditions change, rather than waiting for timer expiration. This feedback mechanism ensures the base station receives current information about UE resource availability, enabling more accurate scheduling decisions and preventing waste of network resources.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12526752B1Wireless communications device using two USIMs

Publication Date: 2026.01.13 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method implemented by a wireless communications device utilizing at least two Universal Subscriber Identity Modules, USIMs, and at least two uplink transmitters, UL Tx, and configured to communicate with a first public mobile network, PLMN, and a second PLMN is provided. The method includes transmitting first data to the first PLMN using a first USIM and the at least two UL Tx. The method further includes transmitting a first power headroom report, PHR, to the first PLMN. The method further includes transmitting second data to the second PLMN using a second USIM and one of the at least two UL Tx. The method further includes in response to using the second USIM and the one of the at least two UL Tx to transmit the second data to the second PLMN, transmitting a second PHR to the first PLMN without waiting for an active PHR configuration timer to expire.