Channel Release Message Redirection for EUTRAN Bands >64

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Solution Overview

Problem

The existing technologies face ambiguities and inconsistencies in redirecting user equipment (UE) from Global System for Mobiles Edge Radio Access Network (GERAN) to Extended Evolved Universal Terrestrial Radio Access Network (EUTRAN) for bands with band numbers greater than 64, leading to potential inter-operability failures due to unclear procedures and priorities in channel release messages.

Innovation Solution

The solution involves encoding specific information elements in channel release messages to unambiguously redirect UE to EUTRAN bands with band numbers greater than 64, using extended EARFCN fields and prioritization mechanisms to ensure correct RAT selection, and defining new information elements for extended cell selection indicators to prevent misinterpretation by UE.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing channel release messages are used for redirection, then backward compatibility is maintained, but ambiguity and inconsistency arise in redirecting UE to EUTRAN bands with band numbers greater than 64

Engineering Contradiction:

Improveredirection reliabilityVSAvoidredirection clarity

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent segments the information elements in the channel release message into distinct components: a first information element for extended cell selection indicator and a second information element for individual priorities. This segmentation allows the system to maintain backward compatibility while adding new redirection capabilities for EUTRAN bands >64, resolving the ambiguity issue by providing clear, structured information without breaking existing message formats.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent embeds the new redirection information elements within the existing channel release message structure. The first and second information elements are nested inside the channel release message, allowing UE to interpret both legacy and extended redirection instructions from a single message source, thereby maintaining compatibility while enhancing redirection reliability.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Adaptability or versatility

If extended EARFCN fields are added to channel release messages, then redirection to EUTRAN bands >64 is enabled, but message structure complexity increases

Engineering Contradiction:

Improveband redirection capabilityVSAvoidmessage structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent divides the extended redirection functionality into separate, named information elements (first information element for extended cell selection, second for individual priorities). This segmentation makes the message structure more manageable and easier to process, reducing the complexity burden while enabling redirection to EUTRAN bands >64.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The channel release message is designed to serve multiple functions: it maintains its original redirection capabilities for legacy bands while simultaneously supporting new EUTRAN band >64 redirection through the added information elements. This multi-functionality approach allows the same message structure to adapt to different band requirements without requiring separate message types.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If prioritization mechanisms are introduced for RAT selection, then correct RAT selection is ensured, but interpretation ambiguity by UE may increase

Engineering Contradiction:

ImproveRAT selection accuracyVSAvoidUE message interpretation

Core Design Contradiction:

ReliabilityVSDifficulty of detecting and measuring

Solution Approach 1:

The patent separates prioritization information into a distinct second information element within the channel release message. This segmentation allows UE to clearly identify and process priority instructions without confusion with other message components, reducing interpretation ambiguity while ensuring accurate RAT selection according to the specified priorities.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12120567B2Base station, user equipment and corresponding methods for redirection from GSM edge radio access network (GERAN) bands to evolved UMTS terrestrial radio access network (EUTRAN) bands (as amended)

Publication Date: 2024.10.15 APPLE INC

AI summary

Some embodiments of this disclosure include systems, apparatuses, methods, and computer-readable media for use in a wireless network for redirecting a user equipment (UE) to an evolved universal terrestrial radio access (UTRA) absolute radio frequency number (EARFCN) of an evolved universal mobile telecommunications service terrestrial radio access network (EUTRAN) band with a band number greater than sixty four. For example, some embodiments are directed to an electronic device including radio front end circuitry and processor circuitry coupled to the radio front end circuitry. The processor circuitry is configured to generate a channel release message and transmit, using the radio front end circuitry, the channel release message to the UE. The channel release message is configured to redirect the UE to the EARFCN of the EUTRAN band with the band number greater than sixty four.