Multicast Control Device Threshold Session Initiation

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Solution Overview

Problem

In multicast communication for IoT devices, devices joining a session mid-cycle often miss necessary data, leading to increased distribution time and communication resource allocation, as they receive missing data across multiple sessions.

Innovation Solution

A multicast control device and method that determines when the number of communication terminals exceeds a threshold, initiating a multicast session for all terminals to ensure they receive data in one session, thereby reducing the number of sessions required.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multicast data is transmitted to UEs joining after session start, then all UEs can receive multicast data, but distribution time increases and communication resources are wasted

Engineering Contradiction:

ImproveAbility to receive multicast dataVSAvoidDistribution time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The system performs preliminary actions by starting the multicast session only after a predetermined number of UEs have joined, ensuring all receiving UEs can obtain complete data in one session. This preliminary threshold-checking action prevents the problem of late-joining UEs missing data, thereby reducing overall distribution time and avoiding the need for multiple sessions.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If multicast session starts early, then session duration increases, but if it starts late, then late-joining UEs miss data

Engineering Contradiction:

ImproveData completenessVSAvoidSession duration

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The system changes the parameter of session start timing from fixed/early to dynamic/threshold-based. By monitoring the number of joined UEs and starting the session only when the predetermined number is reached, the system ensures data completeness for all UEs while minimizing session duration. This parameter change resolves the contradiction between reliability and duration.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If multicast session is extended to accommodate late-joining UEs, then all UEs receive data, but communication resources are allocated longer than necessary

Engineering Contradiction:

ImproveUE reception capabilityVSAvoidCommunication resource allocation

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The system performs preliminary counting of joining UEs and delays session start until the threshold is met. This preliminary action ensures that when the session starts, all intending UEs are already joined and can receive data completely in one session, eliminating the need for extended sessions and reducing communication resource allocation.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11310633B2Multicast control device, multicast control method, and non-transitory computer readable medium

Publication Date: 2022.04.19 NEC CORP

AI summary

A multicast control device capable of reducing the distribution time of multicast data is provided. A multicast control device (10) according to the present disclosure includes a determination unit (11) configured to determine whether the number of communication terminals joining a multicast service exceeds a predetermined threshold, and a session control unit (12) configured to start a multicast session for a plurality of communication terminals joining the multicast service when it is determined that the number of communication terminals joining the multicast service exceeds the predetermined threshold.