C.-C. Lee, P.-C. Chang, and Y.-A. Tsai (Taiwan)
ARQ, TCP Friendly rate control, WLAN.
With technology advances in current wireless network
and broadband Internet, multimedia communications over
wireless network are dramatically boosted. During the
delivery process, a robust transmission rate control
scheme plays the key role to the received picture quality.
However, a wireless network with many non-congestion
losses may bring huge performance reduction to
convenient TFRC rate control mechanisms. This paper
first proposes a Loss Differentiation Algorithm (LDA) for
TFRC in WLAN environment. LDA can effectively avoid
treating wireless bit errors as congestive leading to
unnecessary rate reduction and poor delivery
performance. Moreover, this study further evaluates
influences of Automatic Repeat Request (ARQ)
operations to the performance of TFRC. Simulation
results show that, the received data rate of WLAN using
LDA is obviously higher than that without LDA.
Moreover, when the ARQ is activated, this work finds
that the congestion loss rate and delay time of video
packets can be effectively reduced if the TFRC
mechanism properly includes the packet loss due to
wireless bit error in the determination of available