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
Due to dropped packets, multiple requests may be issued Adjacentchannel polling Mobile listens for adjacent cells. May request change to a new cell Overhead due to polling Cell-handoff (networkdirected) Migrate link-layer connection between cells Lost packets during handoff Missing packets on primary frequency User-user interference Timing sensitivities & handoff hysterisis Frequency hopping Uplink data Spectral shaping requirements imposed by FCC: can only “dwell” in single frequency for 400 ms every 30 seconds.
Each of these entities can be further refined to include a more detailed view of the particular subsystem of interest – in fact, this is precisely what the latter steps in the methodology will address. The development of a set of message sequences capturing the various scenarios that the protocol is expected to encounter is perhaps the most useful, yet most frequently overlooked, step in the protocol design flow because it clearly identifies the interaction and state relationships between concurrent processes.
In hindsight, the strength of an abstract state machine language with clean message-passing semantics and language constructs that are designed to facilitate protocol specification would have greatly simplified the eventual task of implementing the protocol simply because it would be easier to understand what must be implemented. 2, the top-level system is described qualitatively together with the overarching design objectives; from this we derive a set of informal constraints for the link level protocols.
A methodology for the design and implementation of communication protocols for embedded wireless systems by Truman T.E.