Multi-USIM UE Paging Offset for Collision Avoidance

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Solution Overview

Problem

Multi-USIM UE devices with a single Rx processing unit can miss Paging messages from one PLMN due to overlapping or closely timed Paging Occasions (PO) with another PLMN, leading to performance degradation and potential paging failures.

Innovation Solution

A method involving a UE_offset value is introduced to calculate and monitor Paging Occasions, where the UE notifies the core network of collisions, and the core network generates and configures a UE_offset to prevent collisions by shifting the POs, ensuring even distribution of paging messages across multiple networks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a multi-USIM UE with a single Rx processing unit monitors paging occasions for multiple PLMNs simultaneously, then the device can access multiple networks, but paging messages may be missed due to overlapping or closely timed paging occasions

Engineering Contradiction:

Improvemulti-network access capabilityVSAvoidpaging message reception reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The core network performs preliminary actions by calculating and configuring appropriate UE_offset values for multi-USIM devices before paging operations occur. The network proactively identifies potential paging collisions and assigns offset values that prevent overlapping paging occasions, ensuring reliable message delivery before the collision can occur.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces a new parameter UE_offset that modifies the paging occasion calculation formula. By changing the parameter set used for paging occasion determination (adding the offset component), the system transforms the paging timing to avoid collisions while maintaining the device's ability to monitor multiple networks.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If paging occasions for different USIMs are made non-overlapping, then paging reliability improves, but the timing flexibility and resource utilization may be reduced

Engineering Contradiction:

Improvepaging detection performanceVSAvoidpaging occasion coordination complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The core network acts as an intermediary that coordinates paging occasions between multiple PLMNs. By introducing the UE_offset parameter through network control, the system mediates the timing conflicts between different networks' paging schedules, distributing paging occasions evenly without requiring complex device-side coordination logic.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Adaptability or versatility

If the UE monitors paging occasions very close in time from different PLMNs, then network coverage is maintained, but retuning delays cause paging messages to be missed

Engineering Contradiction:

Improvenetwork coverage maintenanceVSAvoidretuning delay

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The system applies preliminary anti-action by proactively spacing out paging occasions using UE_offset values. This prevents the harmful effect of retuning delays by ensuring that paging occasions are sufficiently separated in time, eliminating the need for rapid retuning operations that would cause message loss.

Inventive Principle:

Principle #9Preliminary anti-action

Data Source

PatentUS20230300787A1UE offset to avoid paging collision for multi-USIM devices

Publication Date: 2023.09.21 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method performed by a multi-universal subscriber identity module, multi-USIM user equipment, UE, operating in a first public land mobile network, PLMN, and another PLMN, and a multi-USIM UE is provided. The method includes responsive to at least one of receiving an updated 5G-global unique temporary identifier or changing a cell in which the multi-USIM UE is operating, determining whether or not there is a paging occasion (PO) collision with the other PLMN. The method includes responsive to determining that there is a PO collision: notifying a core network about the PO collision; receiving a configuration from the core network, the configuration having a UE_offset value; using the UE_offset value for PO calculation and monitoring; and determining whether or not there is a PO collision with the other PLMN using the UE_offset value.