Exploiting Wireless Broadcast by Opportunistic Packet Splaying

Raghunathan, Vivek; Cao, Min; Kumar, P.R.

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https://hdl.handle.net/2142/99598 Copy

Description

Title

Exploiting Wireless Broadcast by Opportunistic Packet Splaying

Author(s)

• Raghunathan, Vivek
• Cao, Min
• Kumar, P.R.

Issue Date

2006-08

Keyword(s)

• IEEE 802.11
• Floor acquisition
• Packet combining
• Wireless broadcast
• TCP

Abstract

"The IEEE 802.11 random access MAC suffers from expensive channel acquisition costs which are exacerbated by the use of TCP. This floor acquisition mechanism is primarily a way to fashion unicast ""links"" out of what is fundamentally a broadcast medium. The main thesis of this paper is that such unicast usage of the wireless channel is unnecessary, and that once the floor has been acquired, we can instead ""splay"" packets to as many potential receivers as possible using the fact that wireless is a broadcast medium. Splay is placed between the IP and MAC layers and reduces the expensive cost of channel acquisition by opportunistically combining packets intended for different receivers. Splay allows for the use of sophisticated coding approaches to augment the IEEE 802.11 stop-and-go ARQ. This also helps prevent IEEE 802.11 from incorrectly backing off exponentially in response to fading losses on intermediate quality links, which are quite common in practice. We are currently implementing Splay as a Linux kernel module."

Publisher

Coordinated Science Laboratory, University of Illinois at Urbana-Champaign

Series/Report Name or Number

Coordinated Science Laboratory Report no. UILU-ENG-06-2217, DC-225

Type of Resource

text

Language

en

Permalink

http://hdl.handle.net/2142/99598

Sponsor(s)/Grant Number(s)

• DARPA / N66001-06-C-2021 and N00014-0-1-1-0576
• AFOSR / F49620-02-1-0217
• NSF / NSF CNS 05-19535, ANI 02-21357, and CCR-0325716
• USARO / DAAD19-01010-465
• DARPA/AFOSR / F49620-02-1-0325
• Vodafone Graduate Fellowship

Owning Collections