LTE Pre-registration Method for Voice Call Signaling Reduction
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Solution Overview
Problem
LTE networks experience increased signaling load and latency due to the need for User Equipment (UE) to disconnect from LTE and re-register after voice calls, leading to delays in restoring LTE data services.
Innovation Solution
A method for pre-registering UE to an LTE tracking area before attachment, involving a voice communication network exchanging voice data, sending a pre-attachment message to the Mobility Management Entity (MME) with UE and base station IDs, and selecting an LTE Physical Cell Identity (PCI) for pre-registration, allowing UE to attach without a tracking area update.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UE disconnects from LTE network for voice calls, then voice communication is enabled, but LTE data services experience interruption and increased re-registration signaling
Solution Approach 1:
The system performs preliminary actions by pre-registering the UE with the LTE network before the voice call ends. The MME pre-establishes the tracking area information and prepares the network resources, so that when the voice call terminates, the UE can quickly reattach to LTE without performing a full tracking area update, thus reducing re-registration signaling and accelerating service restoration.
2Reliability
If UE performs tracking area update upon re-attachment, then network registration is ensured, but additional signaling load and latency are introduced
Solution Approach 1:
The MME performs preliminary registration actions during the voice call setup phase, pre-establishing the UE's tracking area information in the LTE network. This preliminary action ensures that when the UE reattaches after the voice call, the network already has the necessary registration information, eliminating the need for a full tracking area update and thus reducing re-registration latency while maintaining registration accuracy.
3Reliability
If frequent re-registration is performed, then network connectivity is maintained, but RAN signaling channels become overloaded
Solution Approach 1:
The system performs preliminary registration actions before the voice call ends, pre-establishing the UE's tracking area information. This allows the UE to reattach to the LTE network without performing a full tracking area update, thereby reducing the frequency and intensity of re-registration signaling events while maintaining continuous network connectivity, thus reducing RAN signaling channel overload.
Data Source
AI summary
A data communication system pre-registers User Equipment (UE) to a Long Term Evolution (LTE) tracking area in an LTE network before the UE attaches to the LTE network. A voice communication network receives a release message for a user voice session and responsively transfers a pre-attachment message to an MME in the LTE network comprising a UE Identifier (ID), a serving base station ID, and an indication that the UE will attach to the LTE network. The MME processes the base station ID to select an LTE network Physical Cell Identity (PCI), processes the LTE network PCI to select an LTE tracking area, and pre-registers the UE ID to the selected LTE tracking area. An LTE base station receives an attachment request from the UE based on the LTE network PCI and responsively attaches the UE to the LTE network without performing a tracking area update.