TDMA Communication Error Control with Channel Quality Adaptation

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Solution Overview

Problem

Conventional TDMA communication systems introduce gaps in voice messages due to error correction processes, degrading voice quality as errors are identified and retransmissions are managed without considering channel quality and communication delay.

Innovation Solution

The method involves determining channel quality and setting a communication delay to minimize gaps by selecting an integer value 'K' based on channel quality, which determines how many frames are unused in a time slot, allowing for efficient error-free data transmission and filler data communication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional ARQ error control technique is used to detect and request retransmission of erroneous message data, then error-free communication is achieved, but gaps are introduced in the voice message causing degradation of voice quality

Engineering Contradiction:

Improveerror-free communicationVSAvoidvoice quality

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent applies preliminary action by pre-calculating and storing the round-trip time (RTT) for each mobile station during the call setup phase. This pre-computed RTT information is then used during active communication to predict when retransmitted data will arrive, allowing the system to proactively fill gaps with filler data before they occur, thereby maintaining voice quality while preserving error-free communication through ARQ

Inventive Principle:

Principle #10Preliminary action

2Reliability

If message data is temporally stored for data combining process, then error correction capability is improved, but communication delay increases

Engineering Contradiction:

Improveerror correction capabilityVSAvoidcommunication delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies dynamics by making the data combining process conditional rather than static. The base station dynamically decides whether to perform data combining based on the calculated RTT and the current communication state. By using the pre-computed RTT to predict timing, the system can dynamically adjust whether to store data for combining or to proceed with error-free data, thereby balancing error correction capability with communication delay

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP2549675B1Systems and methods for time division multiple access communication with automatic repeat request error control

Publication Date: 2015.08.12 HARRIS CORP

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AI summary

Systems (100, 200) and methods for providing TDMA communication. The methods involve determining a channel quality of an uplink channel. A communication delay is set equal to an integer value "K". "K" is selected based on the channel quality. "K" ≤ "N". "N" is a total number of frames of a time slot of a TDMA signal (400). Thereafter, First Message Data (FMD) is communicated over the uplink channel in a first time slot (A1) of an uplink signal (1000, 1100, 1200, 1400, 1500,1600). An Error Control Process (ECP) is performed using FMD to at least identify First Error Free Message Data (FEFMD). Filler data and/or at least a portion of FEFMD is communicated over a downlink channel in a last "N-K" frames of a time slot (A1) of a downlink signal (1050, 1150, 1250, 1450, 1550, 1650), when "K" < "N".