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- Differentiated
TCP User
Perception
over Downlink
Packet Data
Cellular
Systems: IEEE
Transactions
on Mobile
Computing,
Vol. 6, No. 3.
(March 2007),
pp.
252-263.Curren
t downlink
scheduling
algorithms in
the (enhanced)
third-generati
on (3G)
cellular
packet systems
exploit
instantaneous
channel status
of multiple
users, but
most of them
are blind to
traffic
information.
To improve TCP
users'
perception of
quality-of-ser
vices (QoSs),
characterized
by response
delay,
goodput, and
always-on
connectivity,
we propose a
cross-layer
hierarchical
scheduler with
traffic
awareness and
channel
dependence to
properly
prioritize
buffer and
radio resource
allocation
among
different TCP
classes. The
scheduler has
two tiers: at
the IP layer,
an intrauser
scheduler
enhances a
common
practice,
i.e., the
DiffServ-based
buffer
management, by
dequeuing
same-user TCP
packets
according to
per-class
specified and
measured
responsiveness
; at the MAC
layer, an
interuser
scheduler
transmits the
dequeued
packets by
considering
the
opportunistic
channel
states, mean
throughput,
and class ID
of all users.
Both tiers
consider the
online
measured
throughput, a
cross-layer
metric, to
achieve
resource and
performance
fairness and
TCP
classification
. Experiments
show that,
compared with
(variations
of)
proportional
fairness (PF)
and other
schemes, our
scheduler can
notably speed
up
time-critical
interactive
TCP services
(HTTP and
TELNET) or TCP
slow-starts
with minor
cost to bulk
file transfer
(FTP) or
long-lived
flows. It
offers
scalable and
low-cost TCP
performance
enhancement
over the
emerging
cellular
systemsAimin
Sang, Xiaodong
Wang, Mohammad
Madihian
Source: IEEE Transactions on Mobile Computing, Vol. 6, No. 3. (March 2007), pp. 252-263.
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