A Fairness-Based Access Control Scheme to Optimize IPTV Fast Channel Changing
Table 2
Parameter values for the case study.
Notation
Description
Values
Length of the considered commercial break
5 Minutes
Bandwidth reserved for unicasting the retained I-frames for FCC on the bottleneck link LN
500 Mbps
The number of IPTV clients downstream of the link LN
4000
The probability a client chooses an SDTV channel when conducting the channel changing
0.7
CBR of multicasting an SDTV channel
4 Mbps
CBR of multicasting an HDTV channel
8 Mbps
I-frame acceleration ratio for an SDTV channel
1.2
I-frame acceleration ratio for an HDTV channel
1.4
CBR of unicasting the retained I-frame for SDTV channels
4.8 Mbps (=)
CBR of unicasting the retained I-frame for HDTV channels
11.2 Mbps (=)
Number of zapping times in the commercial break; conforming to a truncated Poisson distribution ( is the mean, is the upper bound, and is the lower bound)
; ;
Zapping dwell time (i.e., the duration a client browses a certain channel in the zapping mode) conforms to a truncated negative Exponential distribution ( is the mean, is the upper bound, and is the lower bound)
; ;
Size of an I-frame in an SDTV channel, which conforms to truncated Normal distributions ( is the mean, is the upper bound, is the lower bound, and is the standard deviation)
; ; ;
Size of an I-frame in an HDTV channel, which conforms to truncated Normal distributions ( is the mean, is the upper bound, is the lower bound, and is the standard deviation)
; ; ;
Time needed to transmit a retained I-frame of an SDTV channel
Time needed to transmit a retained I-frame of an HDTV channel
FCC failure delay (FFD) for an SDTV channel; subjects to a truncated negative Exponential distribution ( is the mean, is the upper bound, and is the lower bound)
; ;
FCC failure delay (FFD) for an HDTV channel; subjects to a truncated negative Exponential distribution ( is the mean, is the upper bound, and is the lower bound)
