Temporary UE Identifier Segmentation Across RRC Messages

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Solution Overview

Problem

Existing wireless networks face challenges in transmitting a temporary UE ID due to size limitations in the RRC connection request, which affects contention resolution and connection performance, especially in LTE networks with truncated identifiers.

Innovation Solution

The temporary UE ID is divided into two parts, with the first part transmitted via the RRC Connection Request message and the second part via the RRC Connection Setup Complete message, allowing for a larger identifier size that fits within the message constraints.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If the temporary UE ID is transmitted in the RRC Connection Request message, then the device identification is provided for contention resolution, but the identifier size is limited by the message structure

Engineering Contradiction:

Improvetemporary UE ID informationVSAvoidmessage structure complexity

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The temporary UE ID is divided into two parts: the first part (e.g., 32 bits) is transmitted in the RRC Connection Request message for initial contention resolution, while the second part (e.g., 16 bits) is transmitted later in the RRC Connection Setup Complete message. This segmentation allows the initial message to remain within size constraints while preserving the ability to transmit the complete identifier subsequently.

Inventive Principle:

Principle #1Segmentation

2Ease of operation

If the temporary UE ID is truncated to fit the message size, then the message can be transmitted successfully, but the device identification becomes ambiguous

Engineering Contradiction:

Improvemessage transmissionVSAvoiddevice identification precision

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

By segmenting the temporary UE ID into two parts transmitted at different stages, the system avoids truncation entirely. The first part enables initial message transmission and contention resolution, while the second part is transmitted later to provide complete, unambiguous device identification, thus maintaining both transmission feasibility and identification precision.

Inventive Principle:

Principle #1Segmentation

3Reliability

If a larger temporary UE ID is used for better identification, then device security is improved, but the message size exceeds transmission constraints

Engineering Contradiction:

Improvedevice identification reliabilityVSAvoidmessage size

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

The complete temporary UE ID (e.g., 48 bits providing unique device identification) is segmented into two parts. The first part fits within the initial RRC Connection Request message size constraints, while the second part is transmitted in the subsequent RRC Connection Setup Complete message. This approach maintains full identification reliability without exceeding any single message size limitations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system performs preliminary contention resolution using the first part of the temporary UE ID before transmitting the complete identifier. This preliminary action enables the network to resolve contention among multiple devices using only the first part, and then obtains the complete identifier afterward for reliable device recognition and security establishment.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP4075761B1Methods for transmitting a temporary identifier

Publication Date: 2026.01.07 ZTE CORP

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AI summary

Various implementations of a method for transmitting a temporary identifier involve a wireless communication device: transmitting a first portion of a temporary identifier of the wireless communication device to a radio access network in a first message; and transmitting a second portion of the temporary identifier to the radio access network in a second message.