Coordinated Protocol Retransmission for Data Communication Efficiency

Solution Overview

Problem

Data communication systems face inefficiencies due to the risk of transmitting the same user data multiple times, leading to wastage of transmission resources and prolonged data transmission sessions, as different protocols capable of error detection and recovery may re-transmit data independently without coordination.

Innovation Solution

Implementing a method where a higher layer protocol entity awaits the transmission result from a lower layer protocol entity before deciding whether to re-provide the protocol data unit for transmission, ensuring coordinated re-transmission and eliminating duplicate transmissions by using identifiers for protocol data units to facilitate efficient communication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple protocols independently perform error detection and re-transmission, then data transmission reliability is improved, but transmission resource waste increases due to duplicate re-transmissions

Engineering Contradiction:

Improvedata transmission reliabilityVSAvoidtransmission resource waste

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent merges the error detection and re-transmission functions of multiple protocols into a coordinated system. The higher layer protocol suspends its re-transmission function when the lower layer protocol is performing re-transmission, combining their efforts into a unified error recovery mechanism that avoids duplicate transmissions while maintaining high reliability

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent implements feedback mechanisms where protocol entities exchange information about transmission status and re-transmission activities. The higher layer protocol receives feedback from the lower layer protocol about ongoing re-transmissions and adjusts its behavior accordingly, creating a coordinated error recovery system that prevents resource waste

Inventive Principle:

Principle #23Feedback

2Reliability

If multiple protocols independently perform error detection and re-transmission, then data transmission reliability is improved, but data transmission session duration increases

Engineering Contradiction:

Improvedata transmission reliabilityVSAvoiddata transmission session duration

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The patent merges the error detection and re-transmission functions of multiple protocols into a coordinated system. The higher layer protocol suspends its re-transmission function when the lower layer protocol is performing re-transmission, combining their efforts into a unified error recovery mechanism that avoids duplicate transmissions while maintaining high reliability

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent applies preliminary action by having the higher layer protocol proactively suspend its re-transmission function before the lower layer protocol completes its re-transmission. This preliminary suspension prevents potential duplicate transmissions and reduces overall session duration while maintaining data reliability

Inventive Principle:

Principle #10Preliminary action

3Speed

If the higher layer protocol immediately re-transmits data without waiting for lower layer transmission results, then transmission speed is improved, but duplicate transmissions occur

Engineering Contradiction:

Improvetransmission speedVSAvoidtransmission accuracy

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent implements feedback mechanisms where protocol entities exchange information about transmission status and re-transmission activities. The higher layer protocol receives feedback from the lower layer protocol about ongoing re-transmissions and adjusts its behavior accordingly, creating a coordinated error recovery system that prevents resource waste

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent applies preliminary action by having the higher layer protocol proactively suspend its re-transmission function before the lower layer protocol completes its re-transmission. This preliminary suspension prevents potential duplicate transmissions and reduces overall session duration while maintaining data reliability

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS7895343B2Method and apparatus relating to retransmission of data between different protocol layers

Publication Date: 2011.02.22 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

The present invention relates to a method and apparatus for improving the procedures for error detection and recovery in data communication systems and thereby facilitating a better use of data transmission resources. According to the invention, different protocols capable of re-transmission of data are made to communicate with each other in order to avoid that several protocols simultaneously re-transmit the same data towards the same interface. The transmitting entity of a higher layer protocol will, according to the invention, await the result of the transmission of a certain protocol data unit by a lower layer protocol before making the decision of whether or not the transmitting entity of the higher layer protocol should re-transmit the certain protocol data unit.