att_abstract={{In 3G cellular networks, the release of radio resources
is controlled by inactivity timers. However, the timeout
value itself, also known as the tail time, can last up to 15 seconds
due to the necessity of trading off resource utilization efficiency
for low management overhead and good stability, thus wasting
considerable amount of radio resources and battery energy at
user handsets. In this paper, we propose Tail Optimization Protocol
(TOP), which enables cooperation between the phone and
the radio access network to eliminate the tail whenever possible.
Intuitively, applications can often accurately predict a long idle
time. Therefore the phone can notify the cellular network on such
an imminent tail, allowing the latter to immediately release radio
resources. To realize TOP, we utilize a recent proposal of 3GPP
specification called fast dormancy, a mechanism for a handset to
notify the cellular network for immediate radio resource release.
TOP thus requires no change to the cellular infrastructure
and only minimal changes to smartphone applications. Our
experimental results based on real traces show that with a
reasonable prediction accuracy, TOP saves the overall radio
energy (up to 17%) and radio resources (up to 14%) by reducing
tail times by up to 60%. For applications such as multimedia
streaming, TOP can achieve even more significant savings of
radio energy (up to 60%) and radio resources (up to 50%).}},
	att_authors={ag1971, os1872, ss2864},
	att_categories={C_NSS.18, C_NSS.10},
	att_copyright_notice={{This version of the work is reprinted here with permission of IEEE for your personal use. Not for redistribution. The definitive version was published inICNP, 18th IEEE International Conference on Network Protocols,  2010 {{, 2010-10-05}}
	att_tags={wireless protocols, energy management, umts, fast dormancy},
	author={Alexandre Gerber and Oliver Spatscheck and Subhabrata Sen and Feng Qian (University Michigan) and Zhaoguang Wang (University of Michigan) and Z. Morley Mao (University of Michigan)},
	institution={{ICNP, 18th IEEE International Conference on Network Protocols}},
	title={{TOP: Tail Optimization Protocol for Cellular Radio Resource Allocation}},