Motorola Solutions, Inc.

Chao-Jin Luo

Xiao-Yu Li

Fan Luo

Songxin Yuan

Hai-Bo He

A Base Transceiver Stations (BTS) method includes managing mobile devices in range using temporary identifiers temporarily assigned to each of the mobile devices; receiving a group call grant with a list of required mobile devices for a group call; defining a representation for the required mobile devices based on the required mobile devices' respective temporary identifiers; and broadcasting the group call grant with the representation, wherein the mobile devices utilize the representation to determine if they are required mobile devices for the group call. A mobile device and a group call server are also disclosed.

Method and apparatus for subgroup call to group members missing a group call

A communication system is provided that alerts a public safety officer to missed Push-to-Talk (PTT) group calls. The communication system allows a public safety officer's radio to record a last stop working time. A public safety network then can search a missed call list associated with the public safety officer and automatically push a notification of missed PTT group calls to the public safety officer's radio when the radio re-joins the public safety network. Based on the notification, the public safety officer can choose to review or replay any missed calls to avoid missing important information.

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Chengdu, China

Chao-Jin Luo