By Truman T.E.
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Additional info for A methodology for the design and implementation of communication protocols for embedded wireless systems
Mixed Formal/Informal design flow for data link protocols The premise of this thesis is that a mix of informal and formal specifications and models are needed in order to facilitate the design of robust protocols that have reasonable performance. However, it is essential to understand where each is most appropriate in the design flow as well as the relationships between formal and informal models. With this in mind, we recommend the following methodology: 1) Develop a set of functional requirements that specify the services that a protocol is required to provide, along with performance considerations.
So, for example, one would like to prove that the logical link could not deadlock under packet reordering or loss events. On the other hand, the media access control protocol consists of an algorithm that is designed to minimize the interference between users, and its evaluation must be done in terms of the probabilities of collision, loss, and corruption. Thus, performance estimation will largely focus on the media access algorithm. 5) Finally, the system is ready to be implemented as a mix of hardware and software.
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. Informally, the SAPs to the lower levels are primitives to send and receive datagrams.