UE Slice Priority Feedback for Cell Reselection

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Solution Overview

Problem

In mobile communication systems, user equipment (UE) may not be able to appropriately perform cell reselection procedures due to inconsistencies in receiving slice priority information from the core network, leading to issues with legacy and slice-specific frequency priorities.

Innovation Solution

The proposed communication control method involves the UE transmitting slice priority reception/non-reception information to the base station, which then determines whether to include legacy or slice-specific frequency priority information in RRC release messages, ensuring appropriate cell reselection procedures based on available slice priority information.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the base station transmits slice-specific frequency priority information in the RRC release message, then the UE can perform slice-specific cell reselection, but the UE cannot properly use this information if it has not received slice priority information from the core network

Engineering Contradiction:

Improvecell reselection procedure reliabilityVSAvoidslice priority information reception status

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The UE feeds back to the base station whether it has received slice priority information from the core network. This feedback mechanism allows the base station to adapt its RRC release message content based on the UE's actual information state, ensuring that slice-specific frequency priority information is only transmitted when the UE is in a state capable of using it.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The base station dynamically adjusts the content of the RRC release message based on the UE's reception status of slice priority information. When the UE has received slice priority information, the base station includes slice-specific frequency priority information; otherwise, it transmits only legacy frequency priority information, making the system adaptable to different operational states.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If the base station transmits both legacy and slice-specific frequency priority information, then compatibility is maintained, but message size and processing complexity increase

Engineering Contradiction:

Improvefrequency priority information compatibilityVSAvoidRRC message processing complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The frequency priority information is segmented into two distinct types: legacy frequency priority information and slice-specific frequency priority information. The base station selectively transmits only the relevant segment based on the UE's capability and reception status, avoiding the need to always transmit both types simultaneously.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The base station transmits only the necessary portion of frequency priority information based on the UE's state. When slice priority information has been received by the UE, only slice-specific frequency priority information is transmitted. When not received, only legacy frequency priority information is transmitted, avoiding unnecessary data transmission and processing.

Inventive Principle:

Principle #16Partial or excessive action

3Reliability

If the UE always expects slice-specific frequency priority information, then slice-specific cell reselection is enabled, but legacy cell reselection fails when slice priority information is not received

Engineering Contradiction:

Improveslice-specific cell reselection reliabilityVSAvoidcell reselection procedure simplicity

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The UE autonomously determines which cell reselection procedure to perform based on whether it has received slice priority information from the core network. This self-service mechanism eliminates the need for complex external control logic, as the UE's own information state drives the selection of the appropriate reselection procedure.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The UE performs a preliminary check to determine whether slice priority information has been received before initiating the cell reselection procedure. This preliminary action ensures that the UE is properly prepared and informed about which type of frequency priority information to expect in the upcoming RRC release message.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250184981A1Communication control method

Publication Date: 2025.06.05 KYOCERA CORP

AI summary

A communication control method according to one aspect is a communication control method in a mobile communication system. The communication control method includes a step of, by a user equipment, transmitting slice priority reception/non-reception information to a base station, the slice priority reception/non-reception information indicating whether slice priority information indicating a priority of a network slice has been received from a core network apparatus.