By Truman T.E.

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The difficulty in applying this layering approach lies not in defining clean service access points and abstracting lower level functionality; the real difficulty is in separating the semantics of the service primitives. This is a subtle point, and one worth further discussion. The specification for the widely used ARPA Transmission Control Protocol (TCP), for example, contains no explicit reference to a physical media or to any particular style of implementation. Instead, it is assumed that the implementation has a means of providing a best-effort datagram transfer service between endpoints, and 13 the TCP specification focuses solely upon higher level issues such as setting up a connection, maintaining order, and so on.

The type tag provides a mechanism to support lightweight protocols that provide data-specific transport services. For example, the transmitter interface module uses the tag to determine how the current packet is to be encapsulated, since optional fields such as packet length, forward error correction, or sequence number, may be omitted for certain types. 1The assignment of tags to a particular data class is globally shared with the backbone network software.

Video server or graphics server) are routed directly to the Pad Server and logically terminate there. 1 Mobility support The network is physically divided into picocells, typically about the size of a single room. Each cell has a basestation/gateway that provides the physical and logical interface between the wireless and wired network. This gateway interacts closely with a Cell Server that is responsible for resource management within each cell. Upon startup, the mobile device listens for periodic beacons that are broadcast by the basestation.

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A methodology for the design and implementation of communication protocols for embedded wireless systems by Truman T.E.

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