Terminal Device PoC Call Arbitration via Delay Measurement

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Solution Overview

Problem

In Push-to-Talk over Cellular (PoC) group communication, terminal devices with large transmission delays are unable to obtain a call right for an indefinite period due to unequal opportunities, leading to missed calls, and the existing PoC server arbitration processes are complex and cumbersome.

Innovation Solution

A terminal device acquires the maximum transmission delay time among connected devices and establishes a prohibition period based on this delay, preventing new data transmission until the prohibition period ends, ensuring equal opportunities for call acquisition and simplifying the process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If terminal devices transmit data without arbitration in PoC group communication, then transmission speed is improved, but transmission delay becomes unequal among devices connected via different networks

Engineering Contradiction:

Improvetransmission speedVSAvoidtransmission delay

Core Design Contradiction:

SpeedVSLoss of time

Solution Approach 1:

The terminal device performs preliminary measurement of transmission delay to each further terminal device before data transmission. Based on the measured delays, the device determines a prohibition period that compensates for the maximum delay in the group, ensuring that all devices receive data within an acceptable time window without requiring complex server-side arbitration.

Inventive Principle:

Principle #10Preliminary action

2Ease of operation

If PoC server implements arbitration process for call right acquisition, then equal opportunities for call acquisition are improved, but device complexity and process complexity worsen

Engineering Contradiction:

Improveequal opportunity for call acquisitionVSAvoidPoC server configuration complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

Each terminal device independently determines the prohibition period by measuring transmission delays to other devices in the group. The device autonomously calculates when it can next acquire call rights based on the maximum delay observed, eliminating the need for complex server-side arbitration mechanisms while ensuring equal opportunities for all devices.

Inventive Principle:

Principle #25Self-service

3Ease of operation

If terminal device with large transmission delay waits for arbitration, then equal opportunity for call acquisition is improved, but productivity and communication efficiency worsen

Engineering Contradiction:

Improveequal opportunity for call acquisitionVSAvoidcommunication efficiency

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The invention changes the time parameter dynamically by setting the prohibition period based on the maximum transmission delay measured in the group. This adaptive time parameter allows devices with larger delays to acquire call rights more frequently, balancing fairness with communication efficiency without requiring lengthy waiting periods or complex arbitration processes.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10536817B2Terminal device and communication method for transmitting speech data

Publication Date: 2020.01.14 JVC KENWOOD CORP

AI summary

A first terminal device communicates with a second terminal device through a fourth terminal device. An acquisition unit acquires a maximum transmission delay time by referring to a transmission delay time with respect to each of the second terminal device through the fourth terminal device. A communication unit transmits data to each of the second terminal device through the fourth terminal device. The communication unit prohibits, when transmission of the data is ended, new data from being transmitted over a prohibition period based on the maximum transmission delay time acquired in the acquisition unit.