Traditionally have been based on wired links only. The schemes mentioned above have all been designed by taking intoĪccount normal assumptions about link characteristics, which Improve compression efficiency further for real-time traffic using In addition to IP, UDP, and TCP compression, an additionalĬompression scheme called Compressed RTP has been developed to Schemes have been successful in improving efficiency over many wiredīottleneck links, such as modem connections over telephone networks. Protocols have been developed to compress the networkĪnd transport protocol headers, and these Utilizing redundancy within individual packets and betweenĬonsecutive packets within a packet stream. Header compression is a technique used to compress and transparentlyĭecompress the header information of a packet on a per-hop basis, Implementation over Various Link Technologies. Implementation Parameters at the Decompressor. Implementation Parameters at the Compressor. Fast Context Initialization, IR Redefinition. Interface, Assisting Layer to Decompressor. Interface, Compressor to Assisting Layer. Additions and Exceptions Compared to ROHC RTP. Overview of the Link-Layer Assisted Profile. RFC 4362 A Link-Layer Assisted ROHC RTP January 2006ġ. This document is a replacement for RFC 3242, which it obsoletes. Transparency, and specifies general logic for compression andĭecompression related to the usage of the header-free packet format. ROHC, states requirements on the assisting layer to guarantee
It defines additional mechanisms needed in Protocol/Real-Time Transport Protocol) packets, utilizingįunctionality provided by the lower layers to increase compressionĮfficiency by completely eliminating the header for most packetsĭuring optimal operation. This document defines a ROHC (Robust Header Compression) profile forĬompression of IP/UDP/RTP (Internet Protocol/User Datagram Distribution of this memo is unlimited.Ĭopyright (C) The Internet Society (2006). Official Protocol Standards" (STD 1) for the standardization stateĪnd status of this protocol. Please refer to the current edition of the "Internet Internet community, and requests discussion and suggestions for This document specifies an Internet standards track protocol for the To see why this makes sense, think about the case where you are adding unsigned 0xFFFFFFFF four times.RObust Header Compression (ROHC): A Link-Layer Assisted Profile for IP/UDP/RTP
You will need to widen your result by three bits and prepend that to the sum.
#Compressor 4.2.2 full#
In that case, you need to keep widening your adder to fit the full possible results of the addition. I'm making that distinction based on your comment that you used compressors inside each 4-byte adder as well.Įssentially at this point you are just adding several partial sums serially, and thus are not needing to do any carry-propagation. It doesn't matter how your adders are implemented inside as long as they are not lossy, i.e. (Source: I have designed an ALU for a commercial microprocessor).īut assuming that the rest of your diagram when you say 4-byte Adder, that you actually mean a full adder is implemented, then you can do what you want to do. These are sometimes called carry-save because the carries are saved off, if needed later, but often disregarded.
These are typically used in large multiplier architectures where it is a common problem to compute partial-products and not the entire sum. Typically when we say "compressor" like your usage in the title of a 4:2 compressor, it is a lossy operation, as you are mapping 16 (2^4) input values to 4 (2^2) output values.
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