Motorola Corporation

Steven T Barrett

Timothy J Muths

Kevin M Laird

Richard E Murray

James M O'Connor

Bruce D Oberlies

In a wireless telecommunications system (40), a subscriber unit (44) transmits a request for a data connection (10) to cellular infrastructure equipment (46), wherein the data connection is between the requesting subscriber unit (42) and a data receiver (80,82) coupled to the cellular infrastructure equipment (46) via a public switched telephone network (68). In response to the transmitted request (10), data connection configuration parameters (78) stored in the cellular infrastructure (46) are selected (90), and the data connection is configured (208) according to the selected data configuration parameters. Data connection configuration parameters may include AT commands from the AT command set.

Method and system for initiating a data transfer in a cellular

The system includes a first data channel established between the mobile communication unit and a wireless communication system. The first data channel is configured to receive the data communication. A second data channel is established between the wireless communication system and another communication system. The second data channel is configured to receive the data communication. An interworking unit is responsive to the first data channel and the second data channel. The interworking unit receives the data communication from the second data channel and queues the data communication when the first data channel cannot receive the data communication.

Method and system for transmitting data to a mobile communication unit

The method includes establishing a first data channel (16) between the calling communication unit (44) and the wireless communication system (40), the first data channel configured to receive and transmit the data communication (21); after establishing the first data channel and before a second data channel (22) has been established between the wireless communication system and the called communication unit (84), receiving by the calling communication unit a message (19), the message indicating that the second data channel has been established; and based on the message, the calling unit transmitting the data communication via the first data channel.

Method and system for transmitting a data communication from a calling

A radio (100) transmits and receives encrypted signals having unencrypted key identifiers, allowing other radios having the corresponding key identifiers and encryption keys to communicate with radio (100). Prior to transmitting an encrypted message, radio (100) selects a unique key identifier automatically and uses the corresponding encryption key to encrypt the message that will be transmitted. Radio (100) transmits the key identifier in an unencrypted format with the encrypted message in order to allow other radios to determine the encryption key used in encrypting the message. When receiving an encrypted message, radio (100) uses the predetermined process stored in the radio (100) to properly select the proper encryption key for use in decrypting the incoming message.

Dynamic encryption key selection for encrypted radio transmissions

A radio (100) capable of automatically selecting an encryption algorithm from among a plurality of algorithms (122 and 124) is disclosed. The method for automatically selecting the proper encryption hybrid includes the steps of: attempting to decrypt the encrypted signal with one of the plurality of encryption algorithms; determining if the encryption algorithm used to decrypt the encrypted signal matches the encryption algorithm used by the encrypted signal; and developing a control signal upon the proper matching of the encryption algorithms.

Automatic encryption selector

A trunked communication system (400) transmits and receives encrypted signals over the system control channel (402). The trunked system (b 400) includes a plurality of radios (300) which can communicate with the communication system via control channel (402). By using control information signals and system information signals radios (300) can determine if it they are capable of decrypting the encrypted control information signals sent over the control channel (402). This is done by first determining if the encryption identification field found in the unencrypted system information signal matches an encryption identification field found in radio (300). If a match is found between the radio's encryption identification and the encryption identification field in the system identification signal radio (300) loads the encryption into the encryption circuitry in order to successfully decrypt the control information signals.

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Grapevine, TX, United States of America

Steven T Barrett