公开(公告)号：US09961703B2

公开(公告)日：2018-05-01

申请号：US15507343

申请日：2014-12-24

Applicant: MOTOROLA SOLUTIONS, INC

Inventor： Kang-Kai Zhao ,  Da-Jun Chen ,  Ya-Hui Gong ,  Yi Tang ,  Yong Tian ,  Wu Yang ,  Dong Zhao

IPC: H04B7/00 ,  H04W76/00 ,  H04W4/08

CPC classification number: H04W76/45 ,  H04W4/08 ,  H04W4/10

Abstract: Disclosed herein are methods and systems for patching direct-mode talkgroups among dual-watch mobile radios. A mobile radio has first and second receivers, and is in a first talkgroup having a first channel. The mobile radio resides the first receiver on the first channel, and detects either a first patch event or a second patch event. The first patch event is an instruction for a first-channel session. The second patch event is an invitation for a second-channel session. Upon detecting the first patch event, the mobile radio transmits an invitation on the first channel and also on one or more other channels respectively associated with one or more other talkgroups, directing all recipients to the first channel. If the mobile radio detects the second patch event, the mobile radio resides the second receiver on the second channel.

公开(公告)号：US09961179B2

公开(公告)日：2018-05-01

申请号：US15320330

申请日：2014-07-28

Applicant: MOTOROLA SOLUTIONS, INC

Inventor： Dong Zhao ,  Yi Tang ,  Fan Yang

IPC: H04M1/725 ,  H04W4/90 ,  H04W8/14 ,  H04W4/02 ,  H04L12/26 ,  H04W4/22 ,  H04W84/18

CPC classification number: H04W76/25 ,  H04L43/10 ,  H04M1/72516 ,  H04W4/025 ,  H04W4/90 ,  H04W8/14 ,  H04W8/26 ,  H04W76/23 ,  H04W84/18

Abstract: At least one embodiment takes the form of a process carried out by a given mobile radio in a group of mobile radios. The process includes broadcasting heartbeat messages in accordance with a group-wide symmetric-timing protocol and maintaining an in-range list of mobile radios. The in-range list is maintained at least in part by (i) adding mobile radios that are not already on the in-range list to the in-range list upon detecting transmissions from such mobile radios; (ii) maintaining, for each mobile radio on the in-range list, a respective keepalive timer in accordance with the group-wide symmetric-timing protocol; and (iii) removing mobile radios from the in-range list upon expiration of the respective keepalive timers. The process further includes presenting an alert via a user interface when a count of mobile radios on the in-range list falls below a notification threshold.