By Truman T.E.

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Each layer offers a set of services to the higher layers, hiding the details of how the services are implemented. The goal is to present the illusion to layer n on host A that the message exchange takes place atomically via layer n - 1 to a layer n peer on host B, as shown in Figure 1— 1. In reality, each layer passes data and control information the layer immediately below it, until the lowest (physical) layer is reached. The function of each layer is outlined in Table 1— 1. Figure 1— 1. OSI Protocol Layers Two dimensions of abstraction are present in this model: service abstraction and inter-layer communication abstraction.

We begin with an overview of the backbone network support for mobility. 1 The InfoNet network infrastructure As described in [NSH96], the InfoNet system provides the backbone network support for the InfoPad. An overarching system requirement for the InfoNet was that it must support both legacy applications and mobile/InfoPad-aware applications. To this end, InfoNet provides a proxy agent – the Pad Server – that acts logically as a single, fixed (non-mobile) InfoPad. , video server or graphics server) are routed directly to the Pad Server and logically terminate there.

Low-overhead, minimal-state communications Consistent with the goal of exploiting network resources, the amount of state maintained in the portable device is minimized and for this reason explicit support 34 for end-to-end transport and internetworking protocols over the wireless link is avoided. Instead, focus was is on the link between the mobile and basestation, in which optimized link-level protocols are tailored to variable rate multimedia traffic and the low reliability of wireless transmission.

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A methodology for the design and implementation of by Truman T.E.
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