摘要:
A communication unit that is registered in a trunked communication system can continue to receive a communication from a first communication unit after initiating a push-to-talk request while the first communication unit is transmitting voice data in the following manner. Having allocated a communication resource to a group of communication units and while processing a request to communicate for the first communication unit, a communication resource allocator receives a request to communicate from a second communication unit to produce a new request to communicate. The communication resource allocator stores the new request to communicate and transmits a response to the second communication unit such that the second communication unit can continue to receive the remainder of the communication from the first communication unit. Once the first communication unit has stopped transmitting its communication, the communication resource allocator retrieves the stored communication request based upon a predetermined retrieval pattern.
摘要:
A method is employed by a central controller of a radio communications system, which method provides for sustaining a predetermined level of communication service. The system includes a plurality of voice channels which are allocated among a plurality of subscribers (108-112) using a first control channel (102). In a preferred embodiment, at least one of the voice channels (104, 106) is also control-capable. The method includes evaluating (502) a current loading condition, and comparing (504) this loading condition with an upper loading threshold. Where appropriate, the controller assigns (506) one of the control-capable voice channels as a temporary control channel.
摘要:
A communication resource allocator can reduce control channel traffic for limited audience communications in the following manner. After receiving and granting a request for allocation of a communication resource by a communication unit, the communication resource allocator determines whether the request is for a limited audience communication. If the request is for a limited audience communication, the communication resource allocator periodically transmits the communication resource allocation until it receives an acknowledgement from each of the communication units in the limited audience communication.
摘要:
A method (215) of converting a current control channel for use as a communication (voice/data) channel, in order to maintain a predetermined level of service in a radio communications system, employs a central controller (101) to allocate a limited number of communication channels among a plurality of subscriber units (108-112). After receiving (203) a request for a communication channel from one of a plurality of subscriber units (108-112), the controller (101) determines (205) whether all of the communication channels are busy. The controller then temporarily converts (215) the current control channel to a communication channel.
摘要:
In a trunking communication system that is equipped to utilize the control channel as both a voice and control channel, a communication unit can transmit control data to the communication resource allocator in the following manner. Once a voice channel is selected as a voice/control channel, a communication resource allocator transmits the selection to the plurality of communication units. Thus, when the control channel is functioning as a voice channel, the communication unit can transmit a control request to the communication resource allocator via the voice/control channel.
摘要:
A method for allocating RF communication resources among RF communication systems. This allocation may be base strictly upon demand or it may be based upon the loading of an RF communication system or the relative loading among a group of RF communication systems.
摘要:
A trunked communication system utilizes talkgroup synchronization for roaming communication units. By automatically matching the communication unit's talkgroup in a first area-wide system with an talkgroup in a second area-wide system, the communication system facilitates rapid association with a desired talkgroup.
摘要:
While receiving a lower priority message, a remote transceiver unit in a trunked radio communication system is diverted immediately to a priority channel when a priority message is generated. In a first embodiment, a low speed, sub-audible sync word, transmitted by a system controller, causes the remote transceiver to momentarily interrupt the current message and receive priority data transmitted by the system controller. If the priority level of the priority messages exceeds that of the current message, it immediately switches to the priority channel. If not, the remote transceiver reverts to its normal receiving mode and continues its original communication. In a second embodiment, the priority data is transmitted entirely sub-sudible so as to not interrupt the current message. Lastly, in a more basic embodiment, a sub-audible word is transmitted to the remote units causing them to revert to the control channel to receive the priority call assignment. Multi-level message priority is also provided by transmitting sequential priority data words which identify calls of varying priority. The remote units may then respond to the highest priority call.
摘要:
A mobility processor (34) provides location update parameters to a subscriber unit (SU1-4). The location update parameters indicate conditions upon which the subscriber unit is to provide its location information to the mobility processor. From the location information, the mobility processor determines whether the subscriber unit has provided the location information in a manner that is consistent with the location update parameters. If the mobility processor determines that the subscriber unit did not provide the location information in a manner that is consistent with the location update parameters, the mobility processor generates a new set of location update parameters which are provided to the subscriber unit.
摘要:
In a multi-site trunked communication system, a method for allowing a communication unit to place a unit directed group call consists of identifying, by the unit initiating the communication, a target unit and transmitting identification information of the target unit and a group call request to a communication resource allocator. Upon receipt of the identification information and the group call request, the communication resource allocator processes the request and when a resource is available in the site that the target unit is located in, allocates the resource such that the target unit and any other units of the communication group in the site can participate in the group call.