RLC Entity Radio Link Failure Prevention via PDCP Feedback

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Solution Overview

Problem

In communication systems, the existing protocols for radio link control (RLC) entities may trigger radio link failure prematurely due to packet retransmissions, even if the packet is received through an additional RLC entity, leading to unnecessary communication disruptions.

Innovation Solution

Implementing a method where a transmitting PDCP entity sends the same packet to both primary and additional RLC entities on the transmission side, and the receiving PDCP entity sends information on packet reception status to the primary RLC entity, allowing it to determine if the packet has been received from the additional RLC entity, thereby preventing premature radio link failure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the primary RLC entity triggers radio link failure based on packet retransmission threshold, then the radio link failure detection is prompt, but it causes unnecessary communication disruptions when packets are actually received through the additional RLC entity

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidprotocol complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The receiving PDCP entity sends feedback information to the primary RLC entity indicating whether packets have been received. This feedback mechanism allows the primary RLC entity to adjust its radio link failure determination based on actual reception status, preventing unnecessary failures while maintaining protocol simplicity

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system performs preliminary packet transmission through both primary and additional RLC entities before the primary entity would trigger failure. The receiving PDCP entity prepares reception status information in advance, allowing the primary RLC entity to avoid premature failure decisions

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the receiving PDCP entity sends packet reception status to the primary RLC entity, then unnecessary radio link failure is prevented, but the communication overhead increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidcommunication overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The feedback information is sent selectively from the receiving PDCP entity to the primary RLC entity only when necessary for determining radio link failure status. This localized information exchange minimizes overhead while ensuring reliability

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11277769B2Communication method, radio communication apparatus, and processor

Publication Date: 2022.03.15 KYOCERA CORP

AI summary

A communication method for controlling a first radio communication apparatus and a second radio communication apparatus. The first radio communication apparatus to include a first transmitting radio link control (RLC) entity which is a primary RLC entity, a second transmitting RLC entity which is an additional RLC entity, and a transmitting packet data convergence protocol (PDCP) entity to send an identical packet to both the first transmitting RLC entity and the second transmitting RLC entity. The second radio communication apparatus to include a first receiving RLC entity which is a primary RLC entity to receive a packet from the first transmitting RLC entity, a second receiving RLC entity which is an additional RLC entity to receive a packet from the second transmitting RLC entity, and a receiving PDCP entity to receive packets from both the first receiving RLC entity and the second receiving RLC entity.