Multi-SIM DSS Band Selection to Avoid Tune-Away Throughput Loss

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Solution Overview

Problem

User Equipment (UE) with multiple subscriptions experiences throughput loss and call termination due to tune away modes when switching between subscriptions, particularly in dynamic spectrum sharing scenarios, leading to inefficient resource utilization and network disconnection.

Innovation Solution

Implement a method and apparatus in the UE to scan for and camp on frequency bands that support Dynamic Spectrum Sharing (DSS), allowing simultaneous operation of multiple subscriptions by prioritizing DSS bands, reducing tune-away times, and enabling parallel communication across subscriptions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the UE uses a single transceiver to communicate over multiple subscriptions, then the device complexity is reduced, but the UE loses throughput on active calls due to tune away mode and may experience call termination

Engineering Contradiction:

Improvetransceiver configurationVSAvoidthroughput

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The UE performs preliminary scanning for DSS-capable frequency bands before establishing communication on the second subscription. By identifying suitable DSS bands in advance and storing this information, the UE can quickly switch to these pre-identified bands when tune-away is required, minimizing disruption to the active call and maintaining throughput.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The UE dynamically selects frequency bands based on DSS capability detection. When a DSS-capable band is identified, the UE transitions to operate on that band for the second subscription, enabling dynamic spectrum sharing that maintains connectivity on both subscriptions without requiring separate transceivers.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If the UE periodically tunes away to monitor the second subscription, then multi-subscription support is achieved, but the UE loses throughput and may experience call termination due to prolonged tune away mode

Engineering Contradiction:

Improvemulti-subscription supportVSAvoidconnection stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

By operating both subscriptions on DSS-capable frequency bands, the UE achieves continuous communication capability on both subscriptions simultaneously. The dynamic spectrum sharing allows the transceiver to switch between bands rapidly, maintaining continuous useful action on both subscriptions without prolonged interruptions that would cause call termination.

Inventive Principle:

Principle #20Continuity of useful action

3Measurement precision

If the UE scans for services on multiple frequency bands, then comprehensive service detection is achieved, but the scan time and power consumption increase

Engineering Contradiction:

Improveservice detection accuracyVSAvoidscan time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

Instead of uniformly scanning all frequency bands, the UE applies local quality by prioritizing the scanning of DSS-capable frequency bands. Once DSS capability is detected on a band, the UE focuses its scanning efforts on that specific band for the second subscription, rather than continuing to scan all bands comprehensively. This localized approach maintains detection accuracy while reducing overall scan time and power consumption.

Inventive Principle:

Principle #3Local quality

4Device complexity

If the UE operates both subscriptions on non-DSS frequency bands, then simple frequency allocation is achieved, but simultaneous communication is not possible requiring tune away mode

Engineering Contradiction:

Improvefrequency allocationVSAvoidcommunication efficiency

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The single transceiver is made universal by enabling it to operate on DSS-capable frequency bands for multiple subscriptions simultaneously. The DSS capability allows the same hardware resource to serve multiple communication functions at once, achieving multi-functionality without increasing device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentEP4193795B1Dynamic spectrum sharing in a multi-subscriber identity module device

Publication Date: 2025.11.19 QUALCOMM INC

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AI summary

An apparatus, method, and computer-readable medium for communicating with multiple subscriptions and dynamic spectrum sharing in a multi-subscriber identity module device are configured to scan for one or more first services corresponding to a first subscription and camp on a first service of the one or more first services corresponding to the first subscription on a first frequency band. The aspects are further configured to determine whether the first frequency band supports Dynamic Spectrum Sharing (DSS) and camp on a second service corresponding to a second subscription on the first frequency band in response to determining that the first frequency band supports the DSS. The aspects are further configured to scan for one or more second services corresponding to a second subscription in response to determining that the first frequency band does not support the DSS and camp on one of the one or more second services.