5G SA Interworking TADS Verification for Call Completion
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Solution Overview
Problem
Current 5G Standalone (SA) systems face challenges in optimizing terminating access domain selection (TADS) flows, leading to network call completion errors due to the inability to determine whether a terminating UE is connected to a 5G SA network before initiating calls, resulting in unnecessary signal routing and bandwidth usage.
Innovation Solution
Implementing a system that checks if the terminating UE is connected to a 5G SA network by verifying its registration with the 5G IP Multimedia Subsystem (IMS) core and supporting voice over New Radio (VoNR) before attempting a network call, using a subscriber server to maintain subscription-related information and perform checks to determine the appropriate radio access technology (RAT) for call completion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system attempts network calls without verifying 5G SA network connection status, then call establishment proceeds without delay, but network call completion errors occur and bandwidth is wasted on unnecessary signaling
Solution Approach 1:
The patent performs TADS checks and verifies 5G SA network connection status before initiating network calls. The system queries the subscriber server to determine whether the terminating UE is connected to a 5G SA network and supports VoNR, allowing the system to prepare the appropriate access domain in advance and avoid call completion errors.
Solution Approach 2:
The patent introduces a subscriber server as an intermediary component that maintains subscription-related information and performs TADS checks. This intermediary handles the verification of 5G SA network connection status and VoNR support, separating the complexity of network compatibility checking from the call establishment process.
2Reliability
If the system performs TADS checks before call establishment, then network call completion errors are reduced, but additional signaling and processing steps are required
Solution Approach 1:
The patent implements a universal TADS check mechanism that handles multiple network types (5G SA, 5G NSA, 4G LTE, 3G UMTS, 2G GSM) through a single unified process. The subscriber server maintains subscription information for all network types and provides comprehensive compatibility verification, reducing the need for separate checking procedures for each network generation.
Solution Approach 2:
The subscriber server acts as an intermediary that centralizes the TADS checking functionality, handling all verification operations in one location. This prevents the complexity of network compatibility checking from being distributed throughout the call establishment process, making the system easier to manage and maintain.
3Productivity
If the system routes signals through legacy networks when 5G SA is unavailable, then service continuity is maintained, but bandwidth usage increases due to suboptimal path selection
Solution Approach 1:
The patent implements dynamic access domain selection that adapts to real-time network conditions. The system continuously monitors 5G SA network availability and VoNR support status, dynamically switching between 5G SA, 5G NSA, and legacy network paths based on current conditions. This dynamic routing ensures service continuity while optimizing bandwidth utilization by selecting the most efficient available path.
Solution Approach 2:
The patent changes the routing parameters (access domain selection) based on network conditions and subscription information. By modifying the selected access domain from 5G SA to alternative networks only when necessary, the system maintains service continuity while minimizing bandwidth consumption by preferring the optimal 5G SA path when available.
Data Source
AI summary
Techniques for optimizing terminating access domain selection (TADS) flow for a Fifth Generation (5G) standalone (SA) capable interworking device with legacy Fourth Generation (4G) voice over long term evolution (VoLTE) network are discussed herein. A 5G SA capable user equipment (UE) may receive a voice call from any generation network. To receive a 5G voice call on an IP Multimedia Subsystem (IMS) network, a terminating UE must be currently connected to a 5G SA network. However, the system has to determine the currently connected radio access technology (RAT) type before establishing a connection; otherwise, attempts to establish a 5G NR connection would result in network call completion errors. The system may configure a home subscriber server to receive a TADS request for the terminating UE and return a TADS status.