Motorola Corporation

Motorola Solutions, Inc.

Zebra Technologies Corporation

Robert A Biggs

Donald G Newberg

Daniel J McDonald

Bradley Michael Hiben

Alan L Wilson

Darrell James Stogner

David L Muri

David G Wiatrowski

Robert D Logalbo

Matthew C Keller

James Earl Mathis

Daniel J Mcdonald

Gary W Grube

John W Maher

Mario Frank DeRango

Brian R Poe

Stephen C Glass

Leslie G Gustafson

Patrenahalli M Narendra

John M Gilbert

Mario F Derango

Joseph Baum

Jeffrey S Anderson

Jerald M Gard

Mohammed A Foustok

Michael P McMahon

Michael P Mcmahon

A method of determining a location of a mobile device in a system having a plurality of fixed transmitters includes: obtaining, at the mobile device, inference model data defining a plurality of node operations; collecting, at the mobile device, respective proximity indicators corresponding to a subset of the fixed transmitters, each proximity indicator representing a proximity of the mobile device to the respective fixed transmitter; at the mobile device, generating a location according to the proximity indicators and the node operations; and presenting the location.

System and method for mobile device locationing

A method includes: receiving a burst including payload and a synchronization field, wherein the synchronization field contains a synchronization pattern; selecting, from a plurality of expected synchronization patterns, a target synchronization pattern dependent on an operating mode; comparing the received synchronization pattern against the target synchronization pattern; and if the received synchronization pattern is of the target synchronization pattern, processing the payload; otherwise, discarding the burst.

Method for selecting an operating mode based on a detected synchornization pattern

Methods for informing a mobile device of adjacent sites in a RF communication system wherein the RF communication system comprises a first network and a second network are disclosed. A mobile device in the first network of the RF communication system updates a signaling gateway with position information of the mobile device wherein the signaling gateway interfaces between the first network and the second network and receives a list of adjacent sites in the second network from the signaling gateway.

Methods for informing subscribers of adjacent sites

A transmission capability of a mobile station that requests to be affiliated with a talk group is received. It is then determined whether to alter a current transmission mode of the talk group based at least in part upon the transmission capability of the mobile station, the current transmission mode of the talk group, and the transmission mode of one or more radio frequency (RF) sites associated with the talk group.

System and method to dynamically manage a talk group signaling type

In a wireless communication system with an air interface comprised of a plurality of bursts, a communication device () receives a burst (). The burst comprises payload (), a first indicator () and a second indicator (). Upon receipt of the burst, the communication device determines a value of the first indicator to determine whether end-to-end encryption is applied to at least a portion of the payload, and determines a value of the second indicator to determine whether air interface encryption is applied to at least a portion of the payload.

Method for utilizing multiple level encryption

A method for providing a mobile device in a packet data network access to a channelized network is disclosed. At a gateway between the two networks, a first channelized network message that is encapsulated in a first IP data packet from the packet data network is received. The first channelized network message is retrieved and reformatted for sending over the channelized network. The gateway then receives a second channelized network message from the channelized network. An identifier of a mobile device associated with the second channelized network message is retrieved and an IP address for the identified mobile device is determined. Then, the gateway encapsulates the second channelized network message into a second IP data packet and sends the encapsulated second channelized network message to the identified mobile device in the packet data network.

Method of access to a channelized network from a packet data network

A method and apparatus for maintaining communications between a mobile computer and a mobile subscriber unit is disclosed. The method and apparatus comprise determining whether a connection is available between the mobile subscriber unit and a radio communications system. If a connection is available, then the method and apparatus include retrieving a first IP address for the mobile computer from the radio communications system. Then, the method and apparatus comprise caching the first IP address in the mobile subscriber unit for use by the mobile computer. Finally, the method and apparatus include utilizing the first IP address even if the radio communications system is unavailable and updating the first IP address with a second IP address obtained from the radio communications system when the radio communications system is available.

Method and apparatus for maintaining communications when radio communication is unavailable

A method for informing a mobile device of adjacent sites in a RF communication system is disclosed. The RF communication system comprises a first network and a second network. At a site in the second network of the RF communication system, information is maintained of adjacent sites wherein the adjacent sites are within the first network, and a first list of adjacent sites is broadcast to at least one mobile device within coverage of the site in the second network.

Methods for informing subscribers in a channelized network of adjacent sites

Methods are disclosed for providing requested access, network-initiated access and autonomous access to communication resources (-) by wireless communication unit(s) (), and for controlling the different types of access using access control identifier(s) assigned to the devices. Requested access requires a communication unit to send a call request () to a communication resource controller (). The request () includes at least an identification of the communication unit and an access control identifier associated with the communication unit. Network-initiated access comprises a communication resource controller or other fixed network equipment sending a page request () to the communication unit which responds with a page response message () including the identification of the communication unit and an access control identifier. The communication resource controller () determines, based on the access control identifier, whether a communication resource is available to support the request. Autonomous access comprises the communication unit () receiving a service advertisement message () identifying a communication resource and one or more access control identifiers associated with the communication resource. The communication unit determines its eligibility for autonomous access based on the service advertisement message. The service advertisement message may be used to indicate an availability status of communication resources as available for autonomous access or requested access or not available for selected user groups.

Methods for providing access to wireless resources in a trunked radio communication system

In a wireless communication system with an air interface comprising a plurality of bursts, a plurality of bursts is defined. Each burst comprises a field () embedded within the burst. The field is one of a synchronization field (') and a signaling field (&#x2033;). When the field is a synchronization field, a position of at least one subsequent burst comprising the signaling field is defined, and a position of at least one subsequent burst comprising the synchronization field is defined.

Method for selectively allocating a limited number of bits to support multiple signaling types on a low bit rate channel

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.

Method for selecting an operating mode based on a detected synchronization pattern

In a time division multiple access system, a subscriber listens to an assigned channel () and an alternate channel () until a location of reverse channel signaling is determined for the assigned channel. The subscriber also obtains a fixed periodic rate () for the reverse channel signaling. Based on the fixed periodic rate, the subscriber selectively listens to the alternate channel to receive reverse channel signaling while transmitting information on the assigned channel. The base repeater, however, selects the fixed periodic rate for reverse channel signaling and transmits the reverse channel signaling at the fixed periodic rate to the transmitting subscriber. If the base repeater receives a burst belonging to a superframe and determines that any burst in the superframe will collide with the reverse channel signaling, the base repeater buffers any received burst in the superframe and transmits the buffered bursts at a subsequent time.

Method of signaling reverse channel information with minimal voice/data delay

A subscriber unit () listens to a first channel () comprising a plurality of micro-slots and a plurality of data units. The subscriber unit decodes at least a portion of a data unit on the first channel comprising a micro-slot value. The subscriber unit learns the synchronization between the first channel and a second channel () based on the micro-slot value. A first base radio () transmits a first plurality of data units on the first channel. A second base radio () transmits a second plurality of data units on the second channel. The first plurality of micro-slots on the first channel are synchronized with the second plurality of micro-slots or plurality of frame boundaries on the second channel. The first base radio transmits a message () on the first channel in at least one of the plurality of data units, wherein the message comprises at least a micro-slot value used to associate the synchronization between the first channel and the second channel.

Method for synchronizing a control channel to a working channel

From an unusable site, one or more communication units selects a usable site, thereby reducing missed communications. First, a manager determines ( ) that a site is unusable for a predetermined set of communication unit(s). The predetermined set of communication units may include one or more individual communication units or communication units that are affiliated with a particular talkgroup at a particular time. A zone controller ( ) identifies ( ) any communication units from the set that are registered at the unusable site. The zone controller sends ( ) a message to the identified units to assist them in leaving the site. The communication units search ( ) the near sites for usability and register ( ) at new usable sites. An algorithm is provided to stagger registration by communication units at usable sites.

Method for indicating unusable sites to communication units in a communication system

Systems and methods for implementing dispatch calls using IP multicasting protocols are disclosed. The methods include utilizing a payload multicast group address for distributing payload, and utilizing a control multicast group address for distributing control messages to members of the talkgroup in a single-zone (FIG. ). A zone controller dynamically identifies payload and control multicast group addresses and sends them to participating sites . The participating sites issue Join commands to associated network devices to receive payload and control messages addressed to the respective payload and control multicast group addresses. There is further disclosed a system and method for implementing dispatch calls for members in multiple zones (FIG. ). Zone controllers separately identify control multicast group addresses and send them to affiliating devices in their respective zones. A controlling zone controller dynamically identifies a payload multicast group address that is used by participating devices in both zones. The participating sites issue Join commands to associated network devices to receive payload messages addressed to the payload multicast group address and control messages addressed to their control multicast group address.

Growing community of inventors

Evanston, IL, United States of America

Robert A Biggs