User Equipment ProSe Radio Link Failure Handling

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Solution Overview

Problem

In wireless communication systems, device-to-device communication (ProSe) faces issues such as radio link failures leading to unnecessary power consumption and loss of communication, as devices may continue to transmit without network control, wasting resources and battery power.

Innovation Solution

A method for user equipment (UE) to establish a Radio Resource Control (RRC) connection, perform ProSe communication, and transmit a message to the network upon detecting a radio link failure, switching to UE-to-network communication mode to prevent power wastage, and initiate RRC connection reestablishment procedures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If UE continues to transmit in ProSe communication mode after radio link failure, then communication persistence is maintained, but power consumption increases unnecessarily

Engineering Contradiction:

Improvecommunication persistenceVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements a feedback mechanism where the UE monitors radio link quality and sends feedback information to the network about the radio link failure state. This allows the network to adjust its behavior and the UE to switch modes appropriately, preventing continuous transmission after failure while maintaining communication awareness.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent enables dynamic switching between ProSe communication mode and UE-to-network communication mode based on radio link status. The system transitions from a static communication mode to a dynamic one that adapts to changing radio conditions, allowing the UE to switch modes when radio link failure occurs to avoid unnecessary power consumption.

Inventive Principle:

Principle #15Dynamics

2Use of energy by moving object

If UE switches to UE-to-network communication mode upon radio link failure, then power consumption is reduced, but communication continuity is interrupted

Engineering Contradiction:

Improvepower consumptionVSAvoidcommunication continuity

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent introduces the network as an intermediary that facilitates the transition between communication modes. When radio link failure occurs, the network acts as a mediator to manage the switch from ProSe mode to UE-to-network mode, coordinating the transition to minimize communication disruption while enabling power savings.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Measurement precision

If UE monitors radio link status continuously, then detection accuracy is improved, but processing overhead increases

Engineering Contradiction:

Improvedetection accuracyVSAvoidprocessing overhead

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent implements periodic monitoring of radio link status rather than continuous monitoring. The UE performs detection at specific intervals or triggered by certain events, achieving sufficient detection accuracy while reducing processing overhead and battery consumption compared to continuous monitoring.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS9241365B2Method of handling device to device communication and related communication device

Publication Date: 2016.01.19 HTC CORP

AI summary

A method of handling device to device communication for a first user equipment (UE) in a wireless communication system includes establishing a Radio Resource Control (RRC) connection to a network of the wireless communication system; performing a proximity-based services (ProSe) communication with a second UE of the wireless communication system; and transmitting a first message to the network when the first UE detects a radio link failure in the ProSe communication; wherein the first message indicates the radio link failure to the network or requests changing to a UE-to-network communication mode from a ProSe communication mode.