Terminal Device Random Access State Transition Control

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Solution Overview

Problem

The base station device lacks a mechanism to determine whether a terminal device needs to transition from an inactive state to a connected state during random access procedures, leading to inefficient frequency utilization due to unnecessary signaling messages and RACH processing.

Innovation Solution

The terminal device determines whether to transmit user data in an inactive state or transition to a connected state based on predetermined conditions, and notifies the base station device accordingly, allowing the base station to decide on the necessary state transition.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the base station device executes random access procedure with terminal device in inactive state, then initial connection can be established, but the base station cannot determine whether state transition is needed leading to unnecessary signaling messages

Engineering Contradiction:

Improveconnection establishmentVSAvoidfrequency utilization efficiency

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The terminal device performs preliminary assessment before random access by determining whether state transition is necessary based on whether uplink data is stored in the data buffer. This preliminary determination prevents unnecessary state transitions and signaling messages, improving frequency utilization efficiency while ensuring connection establishment when needed.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The terminal device provides feedback to the base station by including information in the third message indicating whether state transition is necessary. This feedback mechanism enables the base station to make informed decisions about state management, avoiding unnecessary signaling and improving overall system efficiency.

Inventive Principle:

Principle #23Feedback

2Reliability

If the terminal device transitions to connected state for small data transmission, then data can be sent reliably, but unnecessary signaling messages increase processing overhead

Engineering Contradiction:

Improvedata transmissionVSAvoidsignaling processing

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The terminal device performs preliminary assessment by checking whether uplink data is stored in the data buffer before initiating random access. This preliminary action determines whether state transition is necessary, preventing unnecessary signaling messages and processing overhead while ensuring reliable data transmission when needed.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system changes the parameter of state transition necessity based on the presence of data in the buffer. When no data is stored, the terminal remains in inactive state avoiding complex signaling. When data is stored, the terminal transitions to connected state enabling reliable transmission, thus adapting system behavior to actual needs.

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If the base station device lacks determination mechanism for state transition, then random access procedure can be simplified, but frequency utilization efficiency deteriorates due to unnecessary processing

Engineering Contradiction:

Improverandom access procedureVSAvoidfrequency utilization efficiency

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The terminal device performs preliminary determination of state transition necessity based on data buffer status before executing random access procedure. This maintains simplicity of the access procedure while improving frequency utilization efficiency by avoiding unnecessary state transitions and processing.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The terminal device autonomously determines whether state transition is necessary by checking its own data buffer status, without requiring complex base station determination mechanisms. This self-service approach maintains procedural simplicity while improving overall system efficiency.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20250106902A1Terminal device for executing random access procedure, base station device, control method, and computer-readable storage medium

Publication Date: 2025.03.27 KDDI CORP

AI summary

The present invention provides a terminal device comprising: transmission unit configured to transmit a first message including user data to a base station device in a random access procedure in a mobile communication network; and control unit configured to control the transmission unit to: in a case where a predetermined condition to transition from an inactive state to a connected state is satisfied, transmit the first message that includes predetermined information for notifying the base station device that the terminal device needs to transition to the connected state; and in a case where the predetermined condition is not satisfied, transmit the first message that does not include the predetermined information.