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AIRMAIL: A Link-Layer Protocol for Wireless Networks Ender Ayanoglu

Summary: AIRMAIL: A Link-Layer Protocol for Wireless Networks
Ender Ayanoglu
Sanjoy Paul
Thomas F. LaPorta
Krishan K. Sabnani
Richard D. Gitlin
AT&T Bell Laboratories
Holmdel, New Jersey 07733
This paper describes the design and performance of a link-layer protocol for indoor and outdoor
wireless networks. The protocol is asymmetric to reduce the processing load at the mobile, reliability
is established by a combination of automatic repeat request and forward error correction, and link-layer
packets are transferred appropriately during handoffs. The protocol is named AIRMAIL (AsymmetrIc
Reliable Mobile Access In Link-layer). The asymmetry is needed in the design because the mobile
terminals have limited power and smaller processing capability than the base stations. The key ideas in
the asymmetric protocol design consist of placing bulk of the intelligence in the base station as opposed
to placing it symmetrically, in requiring the mobile terminal to combine several acknowledgments into
a single acknowledgment to conserve power, and in designing the base stations to send periodic status
messages, while making the acknowledgment from the mobile terminal event-driven. The asymmetry
in the protocol design results in a one-third reduction of compiled code. The forward error correction


Source: Ayanoglu, Ender - Department of Electrical and Computer Engineering, University of California, Irvine


Collections: Engineering