Browse Prior Art Database

A method of hybrid trunking mode and direct mode communication

IP.com Disclosure Number: IPCOM000242373D
Original Publication Date: 2015-Jul-10
Included in the Prior Art Database: 2015-Jul-10
Document File: 3 page(s) / 163K

Publishing Venue

Motorola

Related People

Zhao, Kk: INVENTOR [+3]

Abstract

This idea introduces a method to make this happen. Radio in a talk group configured both trunking mode and direct mode communication. Radio in this talk group intermittently loops messages through trunking mode communication and direct mode communication. Radio in this talk group determines other members? online information through the message loop in trunking mode and direct mode. Radio selects trunking mode or direct mode to start a call based on other members? online information.

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A method of hybrid trunking mode and direct mode communication

By Zhao Kangkai, Zhao Dong, Yu Changlin

Motorola Solutions, Inc.

 

ABSTRACT

This innovation introduces a new hybrid communication mode which is composed of trunking mode (or LTE system, WIFI system) and direct communication mode. This innovation utilizes both of their advantages and avoids their disadvantages.

PROBLEM

    In current P25 system implementation both trunking (Or LTE system, WIFI system) and direct communication modes have their advantages and disadvantages. For trunking mode (Or LTE system, WIFI system), it has larger coverage but this coverage area is fixed and not moveable. For direct communication mode, it has flexible coverage area but relatively smaller than that of trunking mode.

    

SOLUTION

To resolve the problem mentioned above below methods are introduced:

·         Radio in a talk group configured both trunking mode (Or LTE capacity, WIFI capacity) and direct mode communication.

·         Radio in this talk group intermittently loops messages through trunking mode communication (Or LTE system, WIFI system) and direct mode communication.

·         Radio in this talk group determines other members’ online information through the message loop in trunking mode (Or LTE system, WIFI system) and direct mode.

·         Radio selects trunking mode (Or LTE system, WIFI system) or direct mode to start a call based on other members’ online information.

·         If radio has multi communication capacities such like P25, LTE and WIFI, it does response in direct mode with a list of systems that is in-range of (e.g., trunking system, LTE system, Wi-Fi system, etc).

OPERATION

Below chart and steps describe an example of hybrid communication mode which is composed of trunking mode and direct mode.

1)    Radios in same talk group configured both trunking mode and direct mode. For example, SU1, SU2, SU3, SU4, SU5 are in same talk group both of trunking mode and direct mode.

2)    Radios alternatively reside on direct mode and trunking mode.

a.    Radios in same talk group keep time synchronization using GPS or trunking signaling.

b.    Radios in trunking time slot should be consistent with trunking system’s time slot, so radios can quickly receive signaling from trunking system when jump from direct mode frequency.

3)    Radios send a message in direct mode.

a.    First power up radio would send message first in direct mode.

b.    Radios would intermittently send message in direct mode.

4)    Radios who receive this message would reply in trunking mode.

a.    First time reply would use random reply.

b.    Following reply is according to a sequence which is determined b...