Dynamic ATCF Allocation for rSRVCC Handover

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Solution Overview

Problem

Conventional reverse single radio voice call continuity (rSRVCC) procedures require an access transfer control function (ATCF) to store information about user equipment (UE) even if the rSRVCC procedure is not invoked, leading to resource wastage and inefficient use of ATCF resources.

Innovation Solution

Implement a new rSRVCC procedure where the ATCF is dynamically allocated only during the call setup phase if needed, and the UE registration request message may be devoid of rSRVCC information, with the ATCF URI included only if supported, allowing the MSC server to dynamically allocate resources.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the ATCF stores information about user equipment (UE) in conventional rSRVCC procedures, then voice call continuity is supported, but ATCF resources are wasted when rSRVCC is not invoked

Engineering Contradiction:

Improvevoice call continuityVSAvoidATCF resource wastage

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent implements dynamic allocation of ATCF resources by introducing a registration mechanism where the ATCF is allocated only when a UE explicitly registers for rSRVCC services. The ATCF maintains a registration list that dynamically tracks which UEs require rSRVCC support, allowing resources to be allocated and deallocated based on actual service needs rather than pre-allocating for all UEs

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The UE autonomously determines whether it requires rSRVCC services and initiates registration with the ATCF only when needed. The registration request message includes an indicator that allows the UE to self-manage its rSRVCC service subscription, eliminating the need for the ATCF to continuously store information about all UEs regardless of their actual service requirements

Inventive Principle:

Principle #25Self-service

2Adaptability or versatility

If the ATCF stores information about all UEs, then rSRVCC can be supported for any UE, but the device complexity and resource allocation become inefficient

Engineering Contradiction:

ImproverSRVCC support coverageVSAvoidATCF resource management

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The ATCF implements dynamic resource management through a registration-based approach where the allocation of storage resources and processing capacity adjusts in real-time based on the number of UEs that actually register for rSRVCC services. This eliminates the need for static pre-allocation and reduces overall system complexity

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent introduces a registration list as an intermediate data structure that copies only the necessary information about UEs that require rSRVCC support. Rather than maintaining complete UE information for all devices, the ATCF creates a streamlined representation in the registration list that contains only the essential data needed for rSRVCC operations

Inventive Principle:

Principle #26Copying

Data Source

PatentEP2764739B1Minimal access transfer control function requirements for single radio voice call continuity handover

Publication Date: 2018.07.04 NOKIA SOLUTIONS & NETWORKS OY

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AI summary

A method, apparatus, and computer readable medium is provided for a reverse single radio voice call continuity handover procedure, where an access transfer control function is only allocated dynamically during a call setup phase, if the access transfer control function is needed to support the reverse single radio voice call continuity handover procedure.