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The effect of ISP traffic shaping on user-perceived performance in broadband shared access networks
Joseph Kim
Computer Networks, Volume: 70, Pages: 192 - 209
Swansea University Author: Joseph Kim
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DOI (Published version): 10.1016/j.comnet.2014.06.001
Abstract
Recent studies on the practice of shaping subscribers’ traffic by Internet service providers (ISPs) give a new insight into the actual performance of broadband access networks at a packet level. Unlike metro and backbone networks, however, access networks directly interface with end-users, so it is...
| Published in: | Computer Networks |
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| ISSN: | 1389-1286 |
| Published: |
Elsevier BV
2014
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa18035 |
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| Abstract: |
Recent studies on the practice of shaping subscribers’ traffic by Internet service providers (ISPs) give a new insight into the actual performance of broadband access networks at a packet level. Unlike metro and backbone networks, however, access networks directly interface with end-users, so it is important to base the study and design of access networks on the behaviors of and the actual performance perceived by end-users. In this paper we study the effect of ISP traffic shaping using traffic models based on user behaviors and application/session-layer metrics providing quantifiable measures of user-perceived performance for HTTP, FTP, and streaming video traffic. To compare the user-perceived performance of shaped traffic flows with those of unshaped ones in an integrated way, we use a multivariate non-inferiority testing procedure. We first investigate the effect of the token generation rateand the token bucket size of a token bucket filter (TBF) on user-perceived performance at a subscriber level with a single subscriber. Then we investigate their effect at an access level where shaped traffic flows from multiple subscribers interact with one another in a common shared access network. The simulation results show that for a given token generation rate, a larger token bucket provides better user-perceived performance at both subscriber and access levels. It is also shown that the loose burst control resulting from the large token bucket — up to 100 MB for access line rate of 100 Mbit/s — does not negatively affect user-perceived performancewith multiple subscribers even in the presence of non-conformant subscribers; with a much larger token bucket, however, the negative effect of non-conformant subscribers on the user-perceived performance of conformant subscribers becomes clearly visible because the impact of token bucket size and that of token generation rate are virtually indistinguishable in this case. |
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| College: |
Faculty of Science and Engineering |
| Start Page: |
192 |
| End Page: |
209 |