NDLI: IP header compression: a study of context establishment

Content Provider	IEEE Xplore Digital Library
Author	Westphal, C. Koodli, R.
Copyright Year	2003
Description	Author affiliation: Commun. Syst. Lab., Nokia Res. Center, Mountain View, CA, USA (Westphal, C.; Koodli, R.)
Abstract	The use of bandwidth constrained links in wireless networks necessitates the use of bandwidth saving header compression schemes. In these schemes, a compressor and a decompressor collaborate to encode bulky IP headers into streamlined compressed headers. Intuitively, the gain from compression is the average compressed header length divided by the uncompressed header size. In this paper, we show that this is not true in many situations: this does not account for the cost introduced by the variability of the header sizes during compression context initialization. First, we provide analytical basis for cost of compression context creation and compare the relative costs of establishing contexts with an optimistic approach and with an acknowledgement-based approach. We conclude that the optimistic approach can be used as an upper bound in our analytical model. Second, we evaluate the impact of header compression on traffic patterns in terms of bandwidth allocation, in order to accommodate the burst introduced by compression context initialization. We compute the actual compression ratio, that is the actual number of users of IP header compression that can be multiplexed onto a given link. We show this number is significantly different from the one computed by dividing the link bandwidth by the average rate of a compressed flow. Our results provide a formal basis for context management especially during handovers in mobile networks. For example, our result indicates that there is significant benefit to relocate compression contexts (from one network node to another) rather than to re-establish them each time during handovers.
Starting Page	1025
Ending Page	1031
File Size	308911
Page Count	7
File Format	PDF
ISBN	0780377001
ISSN	15253511
DOI	10.1109/WCNC.2003.1200512
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-03-16
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Bandwidth Traffic control Channel allocation Cost function Wireless networks Collaboration Upper bound Analytical models Computer network management Land mobile radio cellular systems
Content Type	Text
Resource Type	Article

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