Dual Subscriber Identity RF Coordination

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Solution Overview

Problem

Conventional dual-card cellular phones disrupt ongoing data services when a call is received for the second subscriber identity, leading to a poor user experience as data services are suspended without user input, even if the user has not accepted or rejected the call.

Innovation Solution

A mobile communication device with a controller that activates a predetermined Application (APP) using a first subscriber identity for Packet-Switched (PS) data service and establishes a Radio Resource Control (RRC) connection using a second subscriber identity, allowing the device to remain in RRC connected mode while providing PS data service, thus continuing data service until the user decides to accept or reject the incoming call.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the call service for one subscriber identity preempts the ongoing data service for the other subscriber identity, then the call service can be established immediately, but the data service is interrupted causing poor user experience

Engineering Contradiction:

Improvecall establishment speedVSAvoiddata service continuity

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The system dynamically adjusts the operational state of the RF device between different subscriber identities based on service priority and user input. The controller monitors incoming call notifications and user responses in real-time, switching the RF device between serving the first subscriber identity (data service) and the second subscriber identity (call service) as needed, rather than using a static preemptive approach

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system establishes an RRC connection for the second subscriber identity in advance while the data service is ongoing, keeping it in a connected but inactive state. This preliminary action allows the call service to be activated immediately when the user accepts the call, without interrupting the ongoing data service, thus resolving the contradiction between fast call establishment and data service continuity

Inventive Principle:

Principle #10Preliminary action

2Ease of manufacture

If a single RF device is shared by two subscriber identities, then device cost is reduced, but only one subscriber identity can occupy the RF device at any given time

Engineering Contradiction:

Improvedevice costVSAvoidconcurrent service capability

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The single RF device is dynamically allocated between two subscriber identities based on service requirements. The controller manages the switching between identities, allowing the RF device to serve the first subscriber identity for data services and the second subscriber identity for call services at different times, thereby achieving concurrent service capability without requiring additional hardware

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The single RF device is designed to be universal and support multiple subscriber identities and service types. By implementing multi-functionality in the RF device and controller, the system can handle both data services and call services using the same hardware resources, reducing device cost while maintaining adaptability

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Extent of automation

If the data service is suspended as soon as a paging of an incoming call is received, then the call service can be processed, but the data service is interrupted even though the user has not yet decided whether to accept or reject the call

Engineering Contradiction:

Improveautomatic call processingVSAvoiddata service interruption time

Core Design Contradiction:

Extent of automationVSLoss of time

Solution Approach 1:

The system performs preliminary actions by establishing an RRC connection for the second subscriber identity in advance while keeping it in a connected mode. When an incoming call pages the second subscriber identity, the system can quickly process the call notification and switch to call service without interrupting the ongoing data service, as the connection infrastructure is already in place

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system uses feedback from user input (accept or reject call) to determine when to actually suspend the data service. The controller continuously monitors user response to the incoming call notification and only interrupts the data service when the user explicitly accepts the call, thereby minimizing unnecessary data service interruptions

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11582822B2Apparatuses and methods for coordinating operations associated with multiple subscriber identities

Publication Date: 2023.02.14 MEDIATEK INC

AI summary

A mobile communication device including a Radio Frequency (RF) device and a controller is provided. The controller activates a predetermine Application (APP), and provides a Packet-Switched (PS) data service for the predetermined APP using a first subscriber identity via the RF device. Also, the controller establishes a Radio Resource Control (RRC) connection using a second subscriber identity via the RF device to enable the mobile communication device to enter an RRC connected mode after the predetermined APP is activated, and keeps the mobile communication device in the RRC connected mode associated with the second subscriber identity while providing the PS data service for the predetermined APP using the first subscriber identity.