By Truman T.E.
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Extra resources for A methodology for the design and implementation of communication protocols for embedded wireless systems
These features are outlined below. Peripheral vs. central processing unit Experience with an earlier prototype [BBB94] indicated that the microprocessor subsystem, which was responsible for managing data transfers between the wireless modem and the I/O-processing chipset, consumed a significant fraction of the overall power budget and was also a primary performance bottleneck. The most delay-sensitive activities, such as moving the pen and expecting the cursor to track location in real-time, typically generate a large number of very small data transfers, so that the microprocessor spends the majority of its cycles entering and exiting interrupt service routines and setting up data transfers.
Before proceeding, it is beneficial to take a brief look at the history of protocol design, protocol specification, and the various technical tools that have been used to verify correctness and estimate performance. 3 Abstract Services and the OSI Protoc o l “Stack” Because it is the most common decomposition of protocol services, a good starting point for discussing communication protocols is the Open Systems Interconnection (OSI) “protocol stack” [DZ83]. In the OSI model, protocols are conceptually 10 organized as a series of layers, each one built upon its predecessor.
4 An approach to integrating protocol design disciplines This above example attests to the need to tailor protocols to the environment they operate in, and is the strongest argument for a design methodology that integrates performance metrics with functional correctness. Separating the design of the protocol from the context in which it exists leads to performance penalties that are unacceptable for wireless, portable applications. The remainder of this dissertation explores the relationships between specification, verification, performance estimation, and implementation.