METHOD AND DEVICE FOR REUSING CHANNEL FREQUENCIES IN DIRECT MODE

In a direct mode two-way radio frequency communications system having a plurality of direct mode traffic channels, a first direct mode subscriber unit (DMSU) monitors a preconfigured direct mode control channel (DMCC), the DMCC being a channel that is monitored by all DMSUs that are idle in the system, and which is time divided into slots including traffic channel status slots (TCSSs), each TCSS associated with another physical direct mode traffic channel (DMTC) in the communication system. Responsive to detecting a request to initiate a new call, the DMSU selects a first DMTC on which to transmit the call, transmits during the next TCSS of the DMCC associated with the selected DMTC a header indicating the first DMSU's intention to transmit a new call on the selected DMTC, and subsequently switches to the selected DMTC and transmits the new call. 1. In a direct mode two-way radio frequency (RF) communications system having a plurality of direct mode traffic channels and a plurality of direct mode subscriber units , a method comprising:monitoring, by a first direct mode subscriber unit, a preconfigured direct mode control channel, the direct mode control channel being a channel that is monitored by all direct mode subscriber units that are idle in the system, and which is time divided into a plurality of slots including a plurality of traffic channel status slots, each traffic channel status slot associated with another physical direct mode traffic channel in the communication system; and selecting, by the first direct mode subscriber unit, a first particular direct mode traffic channel on which to transmit the new direct mode call;', "transmitting, by the first direct mode subscriber unit, during the next traffic channel status slot of the direct mode control channel that is associated with the selected direct mode traffic channel, a header indicating the first direct mode subscriber unit's intention to transmit a new direct mode call on the selected direct mode ...

AN APPARATUS AND METHOD FOR RETRIEVING GROUP MESSAGES

A repeater receives a first group message directed to a talk group. The repeater assigns a first unique message identifier including a generated first sequence number to the first group message. The repeater broadcasts the first group message with the first unique message identifier and the unique talk group address to the talk group. The repeater later receives a second group message directed to the talk group, generates a second sequence number from the generated first sequence number, assigns a second unique message identifier including the second sequence number to the second group message and broadcasts the second group message to the talk group. The first sequence number and the second sequence number may be used by a receiving radio of the talk group to determine if the radio failed to receive one or more group messages or if a received group messages is a duplicate message. 1. A method comprising ,receiving, by a repeater, a first group message directed to a talk group and including a talk group address uniquely identifying the talk group;assigning, by the repeater, a first unique message identifier including a generated first sequence number and the talk group address to the first group message when the first group message is in a message sequence associated with the talk group;broadcasting, by the repeater, the first group message with the first unique message identifier to the talk group;receiving, by the repeater, a second group message directed to the talk group;generating a second sequence number by one of incrementing or decrementing the generated first sequence number assigned to the first group message by a predetermined amount, and assigning a second unique message identifier including the second sequence number and the talk group address to the second group message; andbroadcasting, by the repeater, the second group message with the second sequence number to the talk group, wherein the first sequence number assigned to the first group message and ...

Method and device for incident situation prediction

A method and device for incident situation prediction. Using the method, a list of objects of interest is generated and stored in a call controller, where each object of interest in the list of objects of interest is associated with at least one of a plurality of incident types. The call controller receives an image stream of an incident and classifies the image stream as one of the plurality of incident types. The call controller selects a subset of objects of interest from the list of objects of interest, the subset of objects of interest associated with the one of the plurality of incident types. The call controller determines whether the image stream includes an object from the subset of objects of interest and generates a notification associated with the object. The notification is transmitted to a set of incident scene devices associated with the incident.

Apparatus and method for incorporating multiple talk groups in a single call

A radio receives a call including a call include bitmask (CIB). The radio retrieves a call include list (CIL) that, for each bit position in the CIB, maps the bit position to one of a radio identifier, a talk group identifier, and a sub-CIL. The radio determines that one bit position in the CIB is set to a value indicating that a radio associated with a radio identifier mapped to the bit position in the CIB via the CIL or to a talk group identifier mapped to the bit position in the CIB via the CIL are to be included in the call. The radio matches its identifier to the radio identifier mapped to the bit position or matches a talk group to which it subscribes to the talk group identifier mapped to the at least one bit position and unmutes the call.

METHOD AND SYSTEM FOR TRACKING A PLURALITY OF COMMUNICATION DEVICES

Method and system for tracking a plurality of communication devices. One system includes a plurality of communication devices that each include a respective electronic processor, a respective camera, a respective location component, and a respective network interface. At least one of the plurality of communication devices is configured to receive location information from each of the other of the plurality of communication devices, generate a tracking map, and transmit the tracking map to each of the other of the plurality of communication devices. The tracking map assigns each of the plurality of communication devices only one of the other of the plurality of communication devices. Each of the plurality of communication devices is configured to control, with its respective electronic processor, its respective camera based on the tracking map to include in its field of view its respectively assigned one of the other of the plurality of communication devices. 1. A communication system comprising:a plurality of communication devices, each of the plurality of communication devices including a respective electronic processor, a respective camera, a respective location component, and a respective network interface; transmit, with its respective network interface, an instruction to each of the other of the plurality of communication devices to enable the respective camera of such other communications devices,', 'transmit, with its respective network interface, a request to each of the other of the plurality of communication devices to provide location information,', 'receive, with its respective network interface, the location information from each of the other of the plurality of communication devices,', 'generate, with its respective electronic processor, a tracking map based on the location information, wherein the tracking map assigns each of the plurality of communication devices only one of the other of the plurality of communication devices, and', 'transmit, with ...

Method and system for tracking a plurality of communication devices

Method and system for tracking a plurality of communication devices. One system includes a plurality of communication devices that each include a respective electronic processor, a respective camera, a respective location component, and a respective network interface. At least one of the plurality of communication devices is configured to receive location information from each of the other of the plurality of communication devices, generate a tracking map, and transmit the tracking map to each of the other of the plurality of communication devices. The tracking map assigns each of the plurality of communication devices only one of the other of the plurality of communication devices. Each of the plurality of communication devices is configured to control, with its respective electronic processor, its respective camera based on the tracking map to include in its field of view its respectively assigned one of the other of the plurality of communication devices.

Method and device for incident situation prediction

A method and device for incident situation prediction. Using the method, a list of objects of interest is generated and stored in a call controller, where each object of interest in the list of objects of interest is associated with at least one of a plurality of incident types. The call controller receives an image stream of an incident and classifies the image stream as one of the plurality of incident types. The call controller selects a subset of objects of interest from the list of objects of interest, the subset of objects of interest associated with the one of the plurality of incident types. The call controller determines whether the image stream includes an object from the subset of objects of interest and generates a notification associated with the object. The notification is transmitted to a set of incident scene devices associated with the incident.

Unfolding and positioning structure of tiolet chair and bath chair

腋下拐改良結構

Combination structure of armrest rack of urinal chair

Combination structure of armrest rack of urinal chair

助行器構造

Chair back assembly structure of potty chair

Armrest assembly structure for handicapped chair

Support structure for commode and shower chair

Angle-tuning structure of chair back for handicapped chair

輪椅組合結構

便器椅椅背角度調整結構

Back assembling structure of commode chair

Method and device for reusing channel frequencies in direct mode

In a direct mode two-way radio frequency communications system having a plurality of direct mode traffic channels, a first direct mode subscriber unit (DMSU) monitors a preconfigured direct mode control channel (DMCC), the DMCC being a channel that is monitored by all DMSUs that are idle in the system, and which is time divided into slots including traffic channel status slots (TCSSs), each TCSS associated with another physical direct mode traffic channel (DMTC) in the communication system. Responsive to detecting a request to initiate a new call, the DMSU selects a first DMTC on which to transmit the call, transmits during the next TCSS of the DMCC associated with the selected DMTC a header indicating the first DMSU's intention to transmit a new call on the selected DMTC, and subsequently switches to the selected DMTC and transmits the new call.

Apparatus and method for retrieving group messages

A repeater receives a first group message directed to a talk group. The repeater assigns a first unique message identifier including a generated first sequence number to the first group message. The repeater broadcasts the first group message with the first unique message identifier and the unique talk group address to the talk group. The repeater later receives a second group message directed to the talk group, generates a second sequence number from the generated first sequence number, assigns a second unique message identifier including the second sequence number to the second group message and broadcasts the second group message to the talk group. The first sequence number and the second sequence number may be used by a receiving radio of the talk group to determine if the radio failed to receive one or more group messages or if a received group messages is a duplicate message.

Apparatus and method for incorporating multiple talk groups in a single call

A radio receives a call including a call include bitmask (CIB). The radio retrieves a call include list (CIL) that, for each bit position in the CIB, maps the bit position to one of a radio identifier, a talk group identifier, and a sub-CIL. The radio determines that one bit position in the CIB is set to a value indicating that a radio associated with a radio identifier mapped to the bit position in the CIB via the CIL or to a talk group identifier mapped to the bit position in the CIB via the CIL are to be included in the call. The radio matches its identifier to the radio identifier mapped to the bit position or matches a talk group to which it subscribes to the talk group identifier mapped to the at least one bit position and unmutes the call.