UCAN: A Unified Cellular and Ad-Hoc Network Architecture

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UCAN: A Unified Cellular and Ad-Hoc Network Architecture (2003)

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by Haiyun Luo , Ramachandran Ramjee , Ran Ramjee , Prasun Sinha , Li (Erran) Li , Songwu Lu

Venue:	In Proceedings of ACM MOBICOM
Citations:	163 - 7 self

BibTeX

@INPROCEEDINGS{Luo03ucan:a,
    author = {Haiyun Luo and Ramachandran Ramjee and Ran Ramjee and Prasun Sinha and Li (Erran) Li and Songwu Lu},
    title = {UCAN: A Unified Cellular and Ad-Hoc Network Architecture},
    booktitle = {In Proceedings of ACM MOBICOM},
    year = {2003},
    pages = {353--367}
}

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Abstract

In third-generation (3G) wireless data networks, mobile users experiencing poor channel quality usually have low data-rate connections with the base-station. Providing service to low data-rate users is required for maintaining fairness, but at the cost of reducing the cell's aggregate throughput. In this paper, we propose the Unified Cellular and Ad-Hoc Network (UCAN) architecture for enhancing cell throughput, while maintaining fairness. In UCAN, a mobile client has both 3G cellular link and IEEE 802.11-based peer-to-peer links. The 3G base station forwards packets for destination clients with poor channel quality to proxy clients with better channel quality. The proxy clients then use an ad-hoc network composed of other mobile clients and IEEE 802.11 wireless links to forward the packets to the appropriate destinations, thereby improving cell throughput. We refine the 3G base station scheduling algorithm so that the throughput gains of active clients are distributed proportional to their average channel rate, thereby maintaining fairness. With the UCAN architecture in place, we propose novel greedy and on-demand protocols for proxy discovery and ad-hoc routing that explicitly leverage the existence of the 3G infrastructure to reduce complexity and improve reliability. We further propose a secure crediting mechanism to motivate users to participate in relaying packets for others. Through extensive simulations with HDR and IEEE 802.11b, we show that the UCAN architecture can improve individual user's throughput by up to 310% and the aggregate throughput of the HDR downlink by up to 60%.

Keyphrases

unified cellular ad-hoc network architecture cell throughput poor channel quality ucan architecture ad-hoc network mobile client aggregate throughput mobile user 11-based peer-to-peer link ad-hoc routing low data-rate user destination client proxy client hdr downlink low data-rate connection base station forward packet extensive simulation base station individual user appropriate destination cellular link throughput gain wireless link novel greedy channel quality proxy discovery active client wireless data network average channel rate on-demand protocol

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