Wireless Datagram Protocol Asymmetric Retry Logic

Solution Overview

Problem

Existing wireless datagram protocols require significant power expenditure for wireless devices, particularly in transmitting and retransmitting data due to signal fading, which is inefficient for devices with limited battery resources.

Innovation Solution

The wireless datagram transaction protocol system incorporates asymmetric retry logic and acknowledgement mechanisms that minimize transmissions by allowing multiple frames to be 'in flight' simultaneously and using overlapping acknowledgement frames to convey receipt information, thereby reducing the need for retransmissions and conserving power.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional acknowledgement and retransmission protocols are used, then data reliability is improved, but power consumption increases significantly

Engineering Contradiction:

Improvedata delivery reliabilityVSAvoidwireless device power consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements selective retransmission where only specific frames that are actually lost or corrupted are retransmitted, rather than retransmitting all frames. The receiver sends negative acknowledgements (NACK) only for missing frames, allowing the transmitter to retransmit only those specific frames. This partial action approach maintains data reliability while significantly reducing power consumption compared to retransmitting all frames.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent employs forward error correction (FEC) codes that are applied to data frames before transmission. By pre-processing the data with FEC encoding, the system enables the receiver to correct certain errors without requiring retransmission. This preliminary protective action reduces the need for power-intensive retransmission operations while maintaining reliable data delivery.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If multiple retransmission attempts are made to ensure data delivery, then reliability is improved, but transmission time increases

Engineering Contradiction:

Improvedata delivery success rateVSAvoiddata transmission time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent implements selective retransmission where only specific frames that are actually lost or corrupted are retransmitted, rather than retransmitting all frames. The receiver sends negative acknowledgements (NACK) only for missing frames, allowing the transmitter to retransmit only those specific frames. This partial action approach maintains data reliability while significantly reducing power consumption compared to retransmitting all frames.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent employs forward error correction (FEC) codes that are applied to data frames before transmission. By pre-processing the data with FEC encoding, the system enables the receiver to correct certain errors without requiring retransmission. This preliminary protective action reduces the need for power-intensive retransmission operations while maintaining reliable data delivery.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If frequent acknowledgments are sent to confirm receipt, then data integrity is improved, but communication overhead increases

Engineering Contradiction:

Improvedata receipt confirmationVSAvoidprotocol processing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the essential acknowledgment function by implementing negative acknowledgements (NACK) that are sent only when data is actually lost or corrupted. Instead of sending acknowledgements for every successfully received frame, the system sends NACK only for missing frames, reducing communication overhead and protocol processing complexity while maintaining data integrity.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent implements selective retransmission where only specific frames that are actually lost or corrupted are retransmitted, rather than retransmitting all frames. The receiver sends negative acknowledgements (NACK) only for missing frames, allowing the transmitter to retransmit only those specific frames. This partial action approach maintains data reliability while significantly reducing power consumption compared to retransmitting all frames.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS7746787B2Wireless datagram transaction protocol system

Publication Date: 2010.06.29 META PLATFORMS INC

AI summary

Systems are provided for sequencing, delivery acknowledgement, and throttling of data packets over a network layer, such as UDP and SMS. To support devices with limited battery resources, the invention incorporates asymmetric retry logic and/or acknowledgements with overlapping ranges, to minimize the transmissions required for the device. The sender of a data-bearing frame does not need to wait for a frame to be acknowledged before sending the next, such that many frames can be “in flight” at once.