Publishing Venue
Motorola
Related People
Inventors:
Zeng, Nico
•
Zhao, Dong
•
Zhao, Kk
Abstract
FNE only broadcasts call activity information on control channel, not allocates voice channel, if there is no subscriber is affiliated on current site. Subscriber affiliates to an active talk group in its scan list when receives call active message. Subscriber affiliates to home talk group after scanned talk group call is over.
A Method For Talkgroup Scan Without
Call Missed
By Zeng Yong, Zhao Dong, Zhao Kangkai
Motorola Solutions, Inc.
ABSTRACT
In
APCO25 trunking system, scan is an important feature and enable user to monitor
multiple talkgroups. But under certain scenarios, the active calls will be
missed during scan. For some user, missing the calls on priority monitor
talkgroup is not acceptable. This innovation presents a solution to solve the
problem.
PROBLEM
Under
the typical configuration, for voice channel efficiency purpose, if in a site
there is no subscriber affiliated to an active talkgroup, FNE will not route
the voice to that site. So if a subscriber is scanning a talkgroup but there is
no other subscriber is affiliated to that talkgroup within the same site, the
scanning subscriber will missed the call.
SOLUTION
When a talkgroup is active and there
is no subscriber affiliated in a site, FNE does not allocate voice channel
immediately but broadcast a TSBK message on the control channel to inform the
subscriber there is active talkgroup. A new TSBK may be introduced for this
idea. The subscriber decode the new TSBK message, if there is match with the
scan list member, the subscriber affiliate to the active talkgroup, after that,
FNE allocate the voice channel and send grant message, then subscriber can move
to the voice channel.
OPERATION
Figure
1 show an example of the invention. Radio 1 and Radio 2 are register on Site 1
and affiliate to TG7001; Radio 3 is register on Site 2, affiliate to TG7002 and
scan TG7001....