Abstract: A system and method for secure data communication between users when logged on to a central server through a network. The system permits subscribers to the system to create associations with non-subscribers which permits those non-subscribers to access the system to send and receive secure data communication to the subscriber that created the association with the non-subscriber.

Abstract: A technique is used in an infrastructure (150) of a two-way radio synchronous communication system (100) to efficiently acquire a predetermined type of information from a selective call device (106). The technique includes receiving an inquiry (1), generating a response schedule, generating a response command message (3), transmitting the response command message, receiving a demand response (4), and accepting the demand response as an acknowledgment to the response command message. The inquiry includes a device latency needed for the selective call device to generate the predetermined type of information and includes a response length. The response schedule is determined from the device latency and the response length. The response command message includes a special command and the response schedule. The demand response includes the predetermined type of information, and is transmitted in accordance with the response schedule.

Abstract: A communication system in which a user device (10) generates authentication information (32) unique to the user device and provides a data packet (35) including this authentication information to an infrastructure part which is a gateway (14) or a host (16). The packet also contains a host identifier (36) or time dependent information (202). This is used at the gateway (14) or the host (16) to authenticate the packet.

Abstract: An internal network (16) is protected from being overloaded by an excessive number of data packets that originate from a source in an external network (10). In a preferred embodiment, data packet gate (20) receives each incoming data packet and determines whether it came from a trusted source. If it was not from a trusted source, and the number of data packets received recently from the same source exceeds a threshold, then data packets from that source are rejected. Preferably, when incoming data packets from all non-trusted sources exceed another threshold, additional data packets from all non-trusted sources are rejected.

Abstract: A base station (222) capable of receiving reverse channel data using two over the air protocols preferably comprises a transmitter (224) and modulator (226) for forward channel transmissions in at least a first protocol, a multi-mode base receiver (228) capable of receiving data on a reverse channel using multiple protocols including the first protocol and at least a second protocol. The dual mode base station further comprises a processor (242) that receives a timing source for the second over the air protocol derived from the remote controller (216) for the second over the air protocol. The processor is preferably programmed to decode timing information from the timing source allowing the multi-mode base receiver 228 to provide a busy indicator to the transmitter 224 and modulator 226 to inhibit the reverse channel of the first over the air protocol during a period set by the busy indicator.

Abstract: A communications unit (10) with a packet subdivider operable on a data packet (200) and an error detecting code generator. An acknowledgement message (NAK) is generated including error detecting code corresponding to packet portions (210-204) from the packet subdivider, thereby requesting retransmission of packet portions. At an originating unit (100) an error detection code is computed for each portion. The computed second error detection code for each sub-portion is compared with the received first error detection code for that portion. Portions for which corresponding error detection codes do not match are identified as bad portions and are retransmitted (220).

Abstract: A method of operation of a data communications system (5) with session control having a data communications network (10) and at least a first communications device (1), a second communications device (2) and a third commnunications device (3) in communications with the data communications network (10). The data communications network (10) identifies a fault status change in communications with the first communications device (1), generates a session control command (6) with an identification number (7) attached responsive to identifying the fault status change and sending the session control command (6) to at least the second and the third communications devices (2 and 3). At least at the second communications device (2), the second communications device (2) receives the session control command (6), deter-mines from the identification number (7) whether the second communications device (2) is affected by the fault status change and selectively performs a session control action in response thereto.

Abstract: A query (160) is sent from a browser (100, 101) to a proxy (300) directed to an information source (140) in a networked data communications system. In one aspect, the query is modified by the proxy to provide a modified query and the modified query is forwarded to the information source (120). A response (170) is received at the proxy from the information source and forwarded to the browser. In another aspect the response is modified by the proxy to provide a modified response (370) which is forwarded to the browser. The proxy (300) has a proxy configuration database (340) including a file (341) of services identifying a method of filtering for a specified browser (100) and filters (302, 304) for filtering responsive to the file of services, respectively, queries from and responses to the specified browser.

Abstract: A subscriber terminal (104) suitable for operation in a wireless communications system (100) arranged and constructed to provide data communications between the infrastructure (111) and the subscriber terminal, includes a portable computing device (105) operating in a operating state and a radio frequency receiver (201) operatively coupled to the portable computing device, the radio frequency receiver arranged to detect a radio frequency interference corresponding to an operating environment, and to execute a corrective action that corresponds to the radio frequency interference. A corresponding method of avoiding desensitization of the radio frequency receiver includes detecting, at the RF receiver, a radio frequency interference that corresponds to an operating environment to provide an interference indication; determining, responsive to the interference indication, a corrective action for the RF receiver; and executing the corrective action for the RF receiver.