Master Device Bandwidth Allocation for Multihop Networks

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Solution Overview

Problem

In multihop communication systems, securing sufficient communication bandwidth for high-priority data transmission is challenging, especially when a large number of nodes transmit participation requests, leading to potential packet collisions and insufficient band allocation for critical services like AMI.

Innovation Solution

A communication control system that allocates time from the frame period, subtracting the total one-frame transmission time used for high-priority services, to nodes for secondary services with lower priority, ensuring preferential bandwidth for high-priority data transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a large number of nodes transmit participation requests to join the network, then the network can accommodate more users and services, but packet collisions increase and sufficient communication band cannot be secured for high-priority services

Engineering Contradiction:

Improvenetwork capacityVSAvoidcommunication reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The master device performs preliminary band allocation before actual data transmission by determining available band based on frame period and total transmission time requirements, then allocating this band to nodes in advance according to service priorities, ensuring high-priority services have guaranteed bandwidth before participation requests are processed

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The communication band is segmented into priority-based allocation zones where high-priority services (AMI) and low-priority services (additional services) are assigned separate transmission time slots, preventing packet collisions by separating traffic streams according to service importance

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If the frame period is extended to accommodate more transmission time, then more services can be provided, but the time available for high-priority service transmission is reduced

Engineering Contradiction:

Improveservice diversityVSAvoidtransmission time for high-priority service

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

Different time slots within the frame period are assigned different quality characteristics based on service requirements, with high-priority services receiving guaranteed transmission time slots with higher reliability characteristics and low-priority services using remaining time slots with best-effort characteristics

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If nodes are allowed to use available band for additional services, then service diversity increases, but high-priority data transmission may suffer from insufficient band allocation

Engineering Contradiction:

Improveservice diversityVSAvoidtransmission efficiency for high-priority service

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The band allocation system dynamically adjusts time slot assignments based on real-time service requirements and traffic conditions, allowing flexible redistribution of available band while maintaining minimum guarantees for high-priority services and enabling additional services to utilize remaining capacity

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS10172039B2Node, master device, and communication control system, method, and program

Publication Date: 2019.01.01 NEC CORP

AI summary

A node is included in a communication control system including a plurality of nodes 31, and a master device 30 for performing flow control of multihop communication in a network including the plurality of nodes 31. To the node 31 in use of second service, a time obtained by subtracting, from a frame period of the network, a total one frame transmission time of each node, used for first service is allocated as one frame transmission time used for second service having a priority set lower than that of the first service.