Abstract: Disclosed is a method for dynamically allocating channel resources in a wireless communication system. A request for a channel resource by a new talkgroup call is received. Whether the new talkgroup call is associated to an associated communication based upon an operational relationship of the new talkgroup call to the associated communication is determined. The channel resource for the new talkgroup call based upon the operational relationship is allocated.

Abstract: In a TDMA system whereby the TDMA system comprises a plurality of subscriber units and a plurality of base radios, a method and system for providing access to a channel for voice transmissions where the first subscriber unit determines whether it is provisioned for polite access to the channel. In addition, the first subscriber unit is characterized by a first color code and a first talkgroup ID. The first subscriber unit also examines the voice transmissions on the channel for voice transmissions that are from a second subscriber unit with a second color code and a second talkgroup ID. If the first color code and the second color code match and if the first talkgroup ID and the second talkgroup match, then the first subscriber unit is allowed access to the channel for voice transmissions even though the channel is being used for voice transmissions by the second subscriber unit.

Abstract: A transmitting device generates a data block including a first field having a first plurality of bits that includes an error detection portion and a second field having a second plurality of bits; selects an error injection mask based on the second plurality of bits; modifies the first plurality of bits with the error injection mask to generate a modified first plurality of bits; and transmits the data block to a receiving device. The receiving device decodes the second plurality of bits to generate decoding results; selects an error injection mask based on the decoding results; modifies the first plurality of bits using the error injection mask to generate a modified first plurality of bits that includes a resultant error detection value indicated in the error detection portion; and detects whether the decoding results for the second field are correct based on the resultant error detection value.

Abstract: A method for indicating padding in a digital mobile radio is disclosed. The method comprises receiving a packet comprising a header and a defined length blocks portion. The defined length blocks portion comprises payload and a padding portion. The padding portion comprises padding and a payload pad count field. The method further indicates by a pad field in the header to examine the payload pad count field to determine an amount of padding for the padding portion of the defined length blocks portion. The method further indicates an amount of padding for the padding portion in the payload pad count field.

Abstract: A system and method for pausing communications from a transmitting radio for a certain period of time in order to allow transmission of other messages. When a first radio determines that a message needs to be transmitted either to a second radio or the transmitting radio, the first radio determines whether there are any available forward channels to transmit the call. If no forward channel is available, the first radio determines a period of time required to transmit the message and sends, on a reverse channel, a “request to pause” signal to the transmitting radio identifying that period of time. Upon receiving the “request to pause” signal, the transmitting radio ceases transmission on the forward channel for the specified period of time, during which time the first radio transmits the message.

Abstract: A system and method for receiving data and control messages comprised of a series of data units is provided. The data units comprising each message are structured to follow a particular sequence, such as zero or more data units of a first type followed by one or more data units of a second type, which may then followed by data units of one or more other predetermined types. Upon receiving a data unit of a first or second type, a number of “units to follow” is determined from information provided in the received data unit. A number of subsequently received data units are then forced to be processed as one of the first type, the second type, or other predetermined type in accordance with the known structure of the message. The number of subsequently received data units that are forced to be processed as one of these types is based on the determined number of units to follow.

Abstract: A computer-readable storage element has code stored thereon that programs a processing device within a communication device to implement a method. The method includes: receiving a plurality of bursts and detecting a failure to receive a preceding header burst; extracting embedded data from the plurality of bursts; determining from the embedded data whether the plurality of bursts comprises valid voice bursts; and when the plurality of bursts comprises valid voice bursts, generating at least one header burst using the embedded data, and transmitting the at least one header burst and the voice bursts.

Abstract: An expandable text messaging service protocol for use with a two-way radio transceiver includes an extension bit field for creating an expandable header for controlling the overall size of data packets used for communicating message traffic. The protocol further includes a control bit field for designing the message as a control message or user message and a protocol data unit (PDU) type field for identifying the message type. A payload field may further be used for carrying message content.

Abstract: A system and method for managing forward channel access using a reverse channel in a wireless communication system is disclosed. A repeater receives requests on a reverse channel to access a forward channel. Each request includes a priority. The repeater selects a request based upon the priority. The repeater then allows access to the forward channel for a transmission based upon the selected request.

Abstract: A first device receives first data that includes a plurality of input vectors, which includes a primary input vector and a set of secondary input vectors and detects uncorrectable errors in the first data based on a quality metric indication. Based on detecting the uncorrectable errors in the first data, the first device substitutes a predetermined codeword for the primary input vector encoded using a non-perfect code, and substitutes a predetermined input vector for the primary input vector. The first device modulates a set of encoded secondary input vectors using the predetermined input vector to generate a modulated set of encoded secondary input vectors and transmits as second data the predetermined codeword and the modulated set of encoded secondary input vectors to a target device, wherein the substituting step creates a first number of errors that is detected by the target device as uncorrectable errors in the transmitted second data.

Abstract: A method and system for scanning a TDMA channel by a subscriber unit in a wireless communications landscape 100 is disclosed. The subscriber unit locks onto a channel that is preprogrammed in the subscriber unit. A base radio transmits a control message to the subscriber unit. The control message informs the subscriber unit of activity present on the channel. The subscriber unit receives and decodes the control message to determine whether there is activity on the channel. If there is, the subscriber unit determines whether the activity is of interest. If it is, then the subscriber unit remains on the channel to receive the activity present on the channel.

Abstract: A transmitting device generates a data block including a first field having a first plurality of bits that includes an error detection portion and a second field having a second plurality of bits; selects an error injection mask based on the second plurality of bits; modifies the first plurality of bits with the error injection mask to generate a modified first plurality of bits; and transmits the data block to a receiving device. The receiving device decodes the second plurality of bits to generate decoding results; selects an error injection mask based on the decoding results; modifies the first plurality of bits using the error injection mask to generate a modified first plurality of bits that includes a resultant error detection value indicated in the error detection portion; and detects whether the decoding results for the second field are correct based on the resultant error detection value.

Abstract: Disclosed is a method and system for interrupting a transmitting subscriber where the transmitting subscriber communicates on a forward channel of a wireless communications system while listening to a reverse channel for reverse channel signaling. The transmitting subscriber receives reverse channel signaling on the reverse channel from a second subscriber, wherein the message is received either directly from the second subscriber or through at least one base radio and terminates the communication on the forward channel in response to the received reverse channel signaling.

Abstract: A system for managing emergency alarm messages in a wireless communications system is disclosed. A first subscriber is assigned an emergency alarm responder role to send an acknowledgement message and present information from a received emergency alarm message to a user of the first subscriber, when the first subscriber receives the emergency alarm message. A second subscriber is assigned an emergency alarm monitor role to present information from the received emergency alarm message to a user of the second subscriber.

Abstract: A received synchronization pattern is compared against first and second known synchronization patterns. If the received pattern is of the first known pattern, the payload is processed as voice; and if the received pattern is of the second known pattern, the payload is processed as non-voice. In an alternative, the received pattern is compared against first and second known synchronization patterns. If the received pattern is of the first known pattern, a first operating mode is selected, and if the received pattern is of the second known pattern, a second operating mode is selected.

Abstract: A user interface control software system (125) has software components organized into distinct partitions (210, 220, 230, 240) with a defined interface governing communications between components of different partitions. Preferably, the software components are organized into a core partition (210), a device specific partition (240), a feature enabler partition (220), and a signaling partition (230). The core partition (210) has software components that perform input handling, application interaction management, application control management, and output handling. The device specific partition (240) has software components for interfacing with user interface hardware in a manner specific to a particular type of communication device. The feature enabler partition (220) has software components that implement procedures for interacting with the user to perform a particular task. The signaling partition (230) manages procedures relating to a signaling protocol that requires user interaction.

Abstract: Symbol recovery for multi-level digital signals has traditionally been difficult because of the nature of the eye pattern output by the discriminator (103), and especially its response to a noisy or impeded signal environment. This method and apparatus for recovery thresholds adjusts (411 and 417) to the current state of the discriminator (103) output of the received signal, based on an attenuated (301) version of that signal. Using a fast adjust mode and slow adjust mode, the threshold generating circuitry (331 and 361) adapts to the signal based on data from the received signal fed into lock detectors (329 and 359) which determine the mode to use.

Abstract: A method of synchronizing a plurality of remote site transmitters (200) in a digital simulcast transmission system is described that enables use of four-level modulation on two-level modulation systems. A synchronization signal is transmitted at a predetermined data rate from a prime site, which signal might include a synchronization pattern having a first and a second portion. The first portion of the synchronization pattern is used for synchronization, while the second portion indicates the completion of the first portion. The method includes detecting (205, 320) of the first portion of the synchronization pattern. Each remote site transmitter (200) further has a modulation clock having a phase polarity which is selected (215, 324) in response to the detection of the first portion of the synchronization signal.