Motorola Corporation

General Dynamics C4 Systems, Inc.

General Dynamics Decision Systems, Inc.

Lewis Sales LLC

Dean Paul Vanden Heuvel

Scott David Blanchard

Rhett Garrett Hayden

Jonathan David Stosz

Charles Joseph Ganucheau, Jr

James William Bishop, Jr

Craig C Halley

Peter J Armbruster

Joseph Olk Lester

Brent M McKay

Johanna Alexandra Wild

Charles J Ganucheau, Jr

Daniel Richard Tayloe

Bradley Robert Schaefer

Pramodkumar Patel

James Morris Tooker

David Jesus Garcia

Kyung T Mun

Jerry Shihkuo Tang

Tommy Wai-Hing Tsui

Danny Walker

Edward Kerry Orcutt

Patrick L Dumstorff

Max Allen Heckard

Systems and methods are described for efficiently transmitting packetized data from a sender to a receiver over a communications link. A compression context is established between the sender and the receiver based upon commonalities in each of the data packets prior to transmitting the data over the communications link. The data is compressed according to the compression context to thereby create compressed data packets, and the compressed data packets are transmitted to the receiver across the communications link. By establishing compression contexts prior to transmission, the need for in-band signaling is reduced or eliminated.

Systems and methods for providing efficient bandwidth utilization in packet switched networks

An interworking unit () for providing an interface between a digital communication network () and a public switched telephone network (PSTN) () includes a de-vocoder (), a protocol termination unit (), and a signal combiner () for processing signals being transferred from the digital network () to the PSTN (). A digital communication signal received by the interworking unit () from the digital network () is processed by both the de-vocoder () and the protocol termination unit (). The outputs of the de-vocoder () and the protocol termination unit () are then combined into a uniquely formatted signal that is then delivered into the PSTN (). Similar functionality is also provided for processing signals in the reverse direction. The interworking unitis capable of processing signals traversing the interface between the networks () without a priori knowledge of the signal type being processed.

Method and apparatus for providing interoperation between a digital communication system and a public switched telephone network

A transmitter adds packet transmission order information to transmitted packets using a forward error device () and a masking device (). The masking device () receives ordering masks () from a mask store (). The ordering masks () are maintained in a known order, and the ordering masks () and the known order are known to both the transmitter and the receiver. The receiver includes an unmasking device () that applies ordering masks to unmask the packets, and then an error detection device checks for errors. The ordering masks () are applied in the known order until errors are below an acceptable limit. When errors are below an acceptable limit, the relative packet order is determined from the known order of the ordering masks.

Packet order determining method and apparatus

Multiple format secure voice apparatus for communication handsets includes a core unit with a speaker, a microphone, a keypad, and a display. The core unit also includes an audio circuit coupled to the speaker and the microphone, an encryption/decryption element coupled to the audio circuit, a coder/decoder element coupled to the audio circuit and the encryption/decryption element, and a control element coupled to the keypad, the display, the audio circuit, the encryption/decryption element, and the coder/decoder element. A standard interface coupling is connected to an audio I/O terminal, a data I/O terminal of the coder/decoder element, and a control I/O terminal of the control element. A mating standard interface coupling mates with the standard interface coupling of the core unit and is coupled to the mating standard interface coupling.

Multiple format secure voice apparatus for communication handsets

A method for masking a location ( ) of a mobile subscriber in a cellular communications network is disclosed. The subscriber location ( ) is masked by dividing a territory of cellular coverage into a grid ( ) of cells ( ) and dislocating the actual location ( ) to a center of a cell ( ) or to a point within a circle ( ).

Method for masking the location of a mobile subscriber in a cellular communications network

A group radio communication system ( ) includes a group controller ( ) which communicates through a satellite-based packet switched data communication network ( ) to converters ( ). The converters ( ) are located within radio coverage areas ( ) of various radio sub-networks ( ). Each radio sub-network ( ) includes a base station ( ), controller ( ) and any number of subscriber radios. The controllers ( ) manage point-to-multipoint communications between subscriber radios ( ) within their radio sub-networks ( ), and the group controller ( ) manages point-to-multipoint communications between radio sub-networks ( ). The converters ( ) translate between protocols ( ) established for communications within specific radio sub-networks ( ) and a protocol ( ) established for communication over the packet switched data communication network ( ). The group controller ( ) duplicates and distributes packets ( ) originating in one radio sub-network ( ) to other radio sub-networks ( ).

Group radio communication system and method using interconnected radio sub-networks

A point-to-multipoint (PTM) communication system ( ) includes a cellular radio infrastructure ( ) having base stations ( ) implemented in satellites ( ) placed in low earth orbits ( ). PTM subscriber radios ( ) share common cellular radio infrastructure ( ) multipoint channels ( ) to engage in a common PTM communication session while the cellular radio infrastructure ( ) also conveys point-to-point communications. A group control computer ( ) constructs a channel list ( ) which is downloaded to PTM subscriber radios ( ). The channel list ( ) identifies multipoint channels ( ) and indicates when and where the channels ( ) are active. Without emitting transmissions to the cellular radio infrastructure ( ), PTM subscriber radios ( ) autonomously switch to new multipoint channels ( ) in response to their current time and location and the channel list ( ).

Group radio with subscriber-radio controlled channel selection

An interworking unit ( ) for providing an interface between a digital communication network ( ) and a public switched telephone network (PSTN) ( ) includes a de-vocoder ( ), a protocol termination unit ( ), and a signal combiner ( ) for processing signals being transferred from the digital network ( ) to the PSTN ( ). A digital communication signal received by the interworking unit ( ) from the digital network ( ) is processed by both the de-vocoder ( ) and the protocol termination unit ( ). The outputs of the de-vocoder ( ) and the protocol termination unit ( ) are then combined into a uniquely formatted signal that is then delivered into the PSTN ( ). Similar functionality is also provided for processing signals in the reverse direction. The interworking unit is capable of processing signals traversing the interface between the networks ( ) without a priori knowledge of the signal type being processed.

A communication system ( ) includes a group call controller (GCC) ( ) for use in establishing, maintaining, and controlling the provision of group call services within the communication system ( ). To initiate a group call session for a particular subscriber group, a group call request is delivered to the GCC ( ) that identifies the desired group. Upon receipt of the request, the GCC ( ) coordinates the delivery of group call notification to the members of the identified group to notify the members of the initiation of the group call session and to identify to the members a physical communication channel ( ) to be used by each member to participate in the group call. Upon receipt of the notification, the group members each tune to a corresponding physical communication channel ( ) and are immediately made part of the group call. The group members are not required to make any transmissions on the physical channel ( ) to participate in the group call.

Method and apparatus for establishing a group call session in a communication system

A point-to-multipoint (PTM) radio communication system ( ) includes a cellular radio infrastructure ( ) having base stations ( ) implemented in satellites ( ) placed in low earth orbits ( ). PTM subscriber radios ( ) share common cellular radio infrastructure ( ) multipoint channels ( ) to engage in a common PTM communication session while the cellular radio infrastructure ( ) also conveys point-to-point communications. The shared multipoint channels ( ) are operated in according with different protocols to deliver system information to PTM subscriber radios ( ), to provide access to PTM subscriber radios ( ), to provide synchronization, to originate a PTM monolog and to be one of many targets of a PTM monolog.

Group radio communication system with shared bi-directional communication channel

A system for encrypting and verifying a data packet includes an encryptor (,), a decryptor (,), an error detector (,), and switch (,). A data packet with embedded error detection codes is encrypted by the encryptor (,), decrypted by the decryptor (,), and then the error detector (,) examines the embedded error detection codes to determine if the data packet has had errors introduced during the encryption/decryption process. When errors are detected, the switch (,) is opened to keep erroneous data from being transmitted.

Method and apparatus for generating and verifying encrypted data packets

A method and apparatus for providing location-based intercept in a system includes an intercept monitoring unit (210) for dynamically modifying an intercept target list (245) in a communications switch (240). The intercept monitoring unit (210) determines, as a function of user location, whether the user's call should be intercepted. If so, either an updated entry is made to the intercept target list (245), or an entire updated copy of the intercept target list (237) is downloaded to the communications switch (240).

Method and apparatus for location based intercept in a communications

In a mobile communications system (10), system (10) through base station (40) or one or more satellites (20) monitors bandwidth availability and determines acquisition channel resource information. The system (10) broadcasts the acquisition channel resource information to the mobile units (30) via satellite (20). According the acquisition channel resource information, the mobile units (30) are enabled at select time instances to access the acquisition channel, obtain a traffic channel and transmit their messages to base station (40). Thus, mobile units (30) are enabled to access system (10) when resources are available.

System for controlling network bandwidth

A system and method provides signaling privacy for communications between nodes of a communications network (30). Multiple logical links exist between distinct network nodes (38-40, 42, 50-53) of the communication network (30). Signaling privacy is achieved by a subscriber unit (80) providing encryption/decryption of signaling data messages at the messaging level. The subscriber unit (80) employs a signaling encryptor/decryptor (86) along the signaling path, which enables the signaling data messages to be separately encrypted from data on the traffic channel. The encrypted signaling data can then be sent along a different logical link from the traffic, while maintaining cipher key synchronization between the signaling encryptor/decryptor (86) and a network encryptor/decryptor (78) at a remote end of the logical link which transports the encrypted signaling data.

Method and apparatus for signaling privacy in personal communications

A method for assigning a system location to an ISU (32) residing in a wireless communication system coverage area (20) that has a plurality of billing territories (40). Base points (42) are defined to be proximate the billing territories (40) such that each of the base points (42) provides a system location for a corresponding billing territory (40). Each of the billing territories (40) has a plurality of reference points (44) distributed therein in accordance with a geographic independent algorithm such that each of the reference points (44) is described by an offset from the corresponding base point (42) of the corresponding billing territory (40). By obtaining an actual location (54) of the ISU (32) and identifying one of the reference points (44) closest to the actual location (54), the ISU (32) is assigned the system location of the identified reference point (44). In a preferred embodiment, the method and apparatus of the present invention are used in a mobile satellite system (19).

Growing community of inventors

Chandler, AZ, United States of America

Dean Paul Vanden Heuvel