Showing papers on "Handshake published in 2000"

Dynamic, seamless switching of a network session from one connection route to another

Abstract: A system for providing continuous connection between a client and a network during a session. The system comprises of a connection utility, which monitors a network session for an occurrence of a pre-defined event and/or condition. The system is particularly advantageous in scenarios where a session's connection is lost and the session has to be reconnected to the network. The system also finds applicability with several other types of events/conditions, including a connection break, a slow or congested connection or a change in the type of data being transmitted. When any one of the pre-defined events/conditions occur, the session is automatically routed from the present connection route to another connection route, and is completed on the other connection route. In order to complete the re-routing of the sessions, session information is cached on the client and the server. The session data is tagged with the original session ID. On the server, a special Client Key is stored for later retrieval, and on the client a special Server Key is stored. During the reconnect, the server uses its previously stored session data associated with the client key and previous session ID to regain a new session connection. The client uses its previously stored session data to regain its side of the connection and to pass the proper request over the wire to the server. This special “handshake” occurs at session reconnect time and allows the special session re-connection to occur. The re-routing of the session is completed with no noticeable loss in connection or session information. Thus, a substantially seamless switching of the session from the first connection route to the second connection route is implemented.

MARCH: a medium access control protocol for multihop wireless ad hoc networks

Abstract: The multiple access with reduced handshake (MARCH) protocol utilizes the broadcast characteristics of an omnidirectional antenna to reduce the number of control messages required to transmit a data packet in multihop ad hoc networks. In MARCH, the RTS-CTS handshake is used only by the first hop of a route to forward data packets while for the rest it utilizes a new CTS-only handshake. Since fewer control packets are transmitted, the probability of packet collision is reduced and therefore the channel throughput is increased. Simulation results demonstrate that MARCH outperforms MAC protocols that employ only the RTS-CTS handshake.

Radio link protocol enhancements to reduce setup time for data calls

Abstract: An improved method and system for determining round-trip time (RTT) during a radio link protocol (RLP) wireless communication link. The RTT estimate is negotiated by both sides of the RLP communication link without the need for the 3-way handshake generally required for RLP synchronization. The method includes techniques used by both sides of the RLP communication link to dynamically update and refine their initial, negotiated RTT estimates.

System and method for remotely creating a physical memory snapshot over a serial bus

Abstract: A two-computer crash dump scenario in which a snapshot of the physical memory of a target computer is extracted and stored by a host computer over an IEEE 1394 compliant serial bus is provided. A host computer debugger remotely stops execution of the core operating system of the target computer. Handshake information is then provided from the target computer core operating system to the host computer debugger. The handshake information specifies, among other information, one or more address ranges at which physical memory is present on the target computer. The host computer debugger then directly accesses the physical memory of the target computer system over the IEEE 1394 bus in accordance with the handshake information. The host computer then stores the contents of the physical memory of the target computer system. Execution of the core operating system of the target system can then be resumed, and the core operating system of the target computer can be debugged in parallel with the resumed execution of the target computer core operating system.

Method and system for a routing mechanism to support two-way RSVP reservations

Abstract: Different arrangements are provided for two-way RSVP reservations. The network resources needed for a two-way communication involving a first party and a second party are reserved via either a 3-way RSVP handshake or a 4-way handshake.

Method and system for establishing a connection

Abstract: The invention relates to a method and system for establishing a first type of connection, wherein a handshake processing is performed with the other party of the first type of connection. If the handshake processing is successful, the first type of connection is established. If the handshake processing is not successful, i.e. the other party does not support the first type of connection, a fallback procedure is started to change the call to a second type of connection determined during the connection establishment. The change to the second type of connection may be performed directly or may be based on a call retry procedure. Thereby, inconvenient disconnections or error processings at the end terminals can be prevented.

On directed transformations of delay-insensitive specifications, alternations and dynamic nondeterminism

Abstract: Delay-insensitive specifications model communicating processes that are embedded in a medium that introduces arbitrary and varying delays on the communication channels. In this paper we study transformations of such specifications. The transformations we study are directed. They are either contracting or expanding. The former are useful when trying to improve specifications, the latter when trying to find implementations. The theory we develop is inspired by transformations based on handshake protocols. We show how an implementation of such a protocol can be derived. We also show how the transformations can help when analyzing specifications containing unavoidable nondeterminism, which is closely related to unavoidable metastability.

Deterring unwanted telephonic transmissions of encoded data

Abstract: A deterrent device 4 for deterring the sending of encoded data transmissions to a telephone call destination is a hand-held self-powered device with acousto-electrical coupling means 7,9 for engaging the handset 5 of the telephone 1. The device detects an encoded handshake message in an input signal and generates a response handshake message according to the same handshake protocol. The response message contains an instructions requiring the intended transmission of encoded data to be aborted and also identifies the receiving call destination. The device enables facsimile transmissions and computer modem data transmissions which are misdirected to be aborted and for the automatic redialling and attempted retransmission to be avoided.

Quality-of-service base fuzzy logic controller for a communication channel

Abstract: The present invention uses fuzzy logic to network statistical patterns and to identify wireless links in a communication channel (Figure 11, 102). The system sends and receives handshake packets, then calculates the mean and variance in a measurement module (Figure 11, 101). The invention employs a fuzzy reasoning engine (Figure 11, 104) to infer quality of service parameters.