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A method to implement quickly channel sync on scene Disclosure Number: IPCOM000245875D
Original Publication Date: 2016-Apr-14
Included in the Prior Art Database: 2016-Apr-14
Document File: 4 page(s) / 104K

Publishing Venue


Related People

Fei, Fisher: INVENTOR [+6]


This idea make all subscribers sync together through sync session id, and keep in touch

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A method to implement quickly channel sync on scene

By Fisher Fei; Yahui Gong; Matthew Tian;

Wen Feng; Kangkai Zhao; Dong Zhao; Dixen Chen

Motorola Solutions



A significant challenge for Fire and EMS customers is synchronizing all radios responding to an incident. When a call comes in, it is usually assigned a channel that all responders need to be on. All these responders have to steer their subscriber to the channel manually. This process takes everyone's time to find the correct channel on all subscribers. 

A method is provides in this document which enable to sync a group of subscribers on a channel and change synced channel easily and automatically on scene.


For Fire and EMS customers, when a call comes in, it is usually assigned a channel that all responders need to be on. SOP is to first get the mobile on the assigned channel and then all responders in the vehicle (usually 4 for fire and 3 for EMS) have to steer their portables to the same channel manually.

This process is done as responders are rushing to the scene and putting on necessary gear. The main customer complaints related to this process is the time it takes for everyone to find the correct channel on all portables and portable users ending up on the wrong channel.




      There is a new functionality “Channel sync” is introduced here. The mobiles designated as “commander” radios, when in this channel sync mode,   portables in proximity of it can press a "Channel Sync" button and automatically switch to the channel of the "Commander" radio. If the mobile changes channel after the “sync” has occurred, the portables will have to “re-sync” in order to go to the new channel automatically.

1.    Synchronization

·         A radio user initiates a ‘channel sync request’ on a selected channel and selected talkgroup.

·         The radio sends a ‘channel sync request’ message to the selected group on the selected channel.

·         Radios that receive the ‘channel sync request’ message display an indication to the radio user.

·         A radio user (a ‘commander’) accepts the ‘channel sync request’, and the radio sends a ‘channel sync response’ message to the requesting radio. (Includes a Session ID specific to this Channel Sync Group, and a Sequence Number specific to this radio).

·         The radios are now ‘channel synced’.

2.    Channel Change

·         A radio user, the ‘commander’, starts a channel change.

·         The radio sends a ‘lock’ message on the previous channel (the one he started on).

This informs the radios that a channel change is starting and not to allow any other channel changes until complete.

Maybe an arbitration mechanism is required.

·         When the commander completes his channel change to the new channel, the radio sends a ‘change channel’ message to the ‘channel synced’ radios on the previous channel.

·         The ‘channel synced’ radios move to the new channel with the commander.

·         Each ‘channel synced’ radio sends...