Robust header compression for RTP header in a RTP profile over Ethernet

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dc.contributor.authorMehta, Mihir Jaykant
dc.date.accessioned2016-11-03T01:34:00Z
dc.date.available2016-11-03T01:34:00Z
dc.date.issued2009-06
dc.description.abstractInformation on the internet is sent using packets and if the layered approach to the internet is observed, one can understand that at every layer, there is a header belonging to that layer is attached to the message. The packet that is built from a sender consists of the original message with a number of headers attached to it. At the receiving end, these headers containing relevant information about the packet are stripped off and sent to the upper layers. When a number of packets flow from a sender to a receiver, it can observed that many fields in the packet headers at various layers posses the same value in every packet header. In other words, there is redundancy observed in many fields of the packet headers. For example, the source IP address and destination IP address remains the same for every packet at the Internet layer. Similarly at the transport layer, the source port and destination port remains the same. Header compression techniques explore the possibilities and mechanisms of compressing header information by removing redundancy of the packet header fields in packets that belong to the same stream. Amongst various header compression schemes, Robust Header Compression has proved to be the most efficient. Voice over IP (VoIP) plays a very important role in carrying voice data over internet and relies on the Real Time Protocol (RTP) as its transport layer protocol. The data generally carried in these packets are quite small when compared to the information carried in the headers. R TP is also used in streaming of media content like audio or video over internet. Hence the headers cause an overhead due to redundant information in them. This objective of this thesis is to design a Robust Header Compression mechanism for a RTP profile that compresses IP, UDP and RTP header fields attached to the data. Further, the RTP timestamp field in the RTP header is used in the compression framework to define parameters based on the timestamp. These parameters namely TS_STRIDE and TS_OFFSET are dependent on the codec that is used in the compression scheme. This thesis successfully proposes and implements a statistical approach in the calculation of these parameters which removes the dependency on the codec that is used. This thesis concentrates on the R TP header in the RTP profile. The implementation is evaluated on an Ethernet based test-bed for potential compression gains. The total header length for IPv4, UDP and RTP headers which is a minimum of 40 bytes is compressed to achieve a header compression gain of nearly 50% using the implemented Robust Header Compression mechanism.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/2974
dc.subjectRobust header compressionen_US
dc.subjectRTPen_US
dc.titleRobust header compression for RTP header in a RTP profile over Etherneten_US
dc.typeThesisen_US
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