Communication Device Mapping Circuit Scale Reduction

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Solution Overview

Problem

The existing communication devices require a large circuit scale due to the need for multiplication and division circuits, which is inefficient for handling various client signals in optical transport networks.

Innovation Solution

A communication device that includes an addition unit, a comparison unit, a data insertion unit, and a storage unit, which allow for the insertion of client data or adjustment data into an OTN frame without performing multiplication or division, thereby reducing the circuit scale.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If multiplication and division circuits are used to determine mapping positions in GMP, then mapping accuracy is improved, but device complexity increases

Engineering Contradiction:

Improvemapping position determination accuracyVSAvoidcircuit scale

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces multiplication and division circuits with an addition-based iterative approach. Instead of using complex multiplication (j×Cm(t)) and division (mod Pm_server) circuits, the invention uses repeated addition of Cm(t) to itself, comparing results with Pm_server to determine mapping positions. This substitution of arithmetic operations reduces circuit complexity while maintaining mapping accuracy.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent segments the multiplication operation into multiple addition operations. Rather than performing a single multiplication (j×Cm(t)), the system performs j sequential additions of Cm(t), breaking down the complex operation into simpler, more manageable steps that require less complex circuitry.

Inventive Principle:

Principle #1Segmentation

2Manufacturing precision

If fixed stuff insertion point adjustment is performed in AMP, then transfer rate matching is improved, but adaptability to various client signals deteriorates

Engineering Contradiction:

Improvetransfer rate matching precisionVSAvoidapplicability to client signal types

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The patent implements a universal mapping mechanism that works across different client signal types without requiring signal-specific configuration. The addition-based GMP approach determines mapping positions using only the parameters Cm(t) and Pm_server, making it applicable to various client signals (SDH, SONET, Ethernet, etc.) without the need for fixed stuff insertion point adjustments that limited AMP to specific signal types.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS9197342B2Communication device, communication system and communication method

Publication Date: 2015.11.24 NEC CORP

AI summary

A communication device includes an addition unit which outputs a result of adding a predetermined number to the number of data blocks of a first signal, a comparison unit which, on the basis of comparison of the addition result with the number of data blocks of a second signal outputs the addition result of subtracting the number of data blocks of the second signal from the addition result, as a selection result, a data insertion unit which, on the basis of comparison of the selection result with the number of data blocks of the first signal, inserts either of the first signal and adjustment data into the second signal, and a storage unit which stores the selection result, and outputs the selection result stored last time to the addition unit, as the predetermined number.