E-Mail: [e-mail]

1
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2001.07.03
???????? ???? E-Mail katto_at_katto.comm.waseda.ac.
jp
2
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• RTSP (??????????????)

3
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4
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5
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HTTP
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WWW???
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6
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HTTP???????
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7
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• HTTP ???????

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Web ????
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8
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HTTP
Web ????
WWW ???
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?? RTSP / MMS ???? UDP?TCP?IP Multicast?...
HTTP???????????????????????
9
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• WWW ?????????????????????????

HTTP??????
HTTP???
MIME ???
MIME ???
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MIME Multipurpose Internet Mail Extensions
encoding
10
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11
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MIME?????????????????????????????
12
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• ?????????? MIME ??????????

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MIME???
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RealSystem
audio/vnd.rn-realmedia rm application/smil
smi smil audio/x-pn-realaudio
ram audio/x-pn/realaudio-plugin rpm
Windows Media Technologies
video/x-ms-wmv wmv audio/x-ms-wma
wma video/x-ms-asf asf asx
??????
Apple QuickTime
video/quicktime mov qt
13
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14
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RTP???? ?????????
15
?????????? (3)

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RealSystem
rm
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Media Technologies
wmv, wma, asf
??? (?????)
QuickTime
mov, qt
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.rm RealMedia File Format
.asf Advanced Streaming Format
.mp3, .mpg ???????????????
16
RTSP (1) ?????????
Realtime Streaming Protocol
?????????????????
????
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DESCRIBE
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SETUP
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PLAY
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PAUSE
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TEARDOWN
????????
ANNOUNCE
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OPTIONS
????????
RECORD
???????
RFC 2326
17
RTSP (2) ???????
???
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GET
HTTP
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DESCRIBE
IP????/??? ???????????? ????????? ???????
SDP
?????? (SDP)
SETUP
RTSP
OK
(??????)
PLAY
OK
(????)
???????
RTP
18
RTSP (3) VCR ????
???
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PAUSE
VCR???? (??)
OK
(??????????)
PLAY
VCR???? (??)
OK
(??????????)
???????
TEARDOWN
OK
(????????)
19
RTSP (4) ????
Init
TEARDOWN
TEARDOWN
SETUP
PLAY
Play
Ready
PAUSE
TEARDOWN
RECORD
Record
20
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WWW??? (????)
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N.A.
N.A.
RTSP ?
SMIL ?
RTCP
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RTP
HTTP
UDP (or TCP)
TCP
TCP
IP
IP
21
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22
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(S,G) ???????????
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IGMP
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G)????????? ???????????????????? ??????????????
????? SSM (Source Specific Multicast)
23
????????? (1)

• ?? (1) WWW ???????

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HTTP
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Web ????
WWW ???
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IGMP
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? ???????
IP Multicast
24
????????? (2)

• ?? (2) SAP ???????

SAP Session Announcement Protocol
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???
SAP (by IP Multicast)
? ????
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IGMP
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IP Multicast
RFC 2974
25
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26
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???3
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EI
EP
EP
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I
P
P
B
B
B
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???1
???2

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• SNR????SNR????????

???1?? ????????
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27
?????????? (1)
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???
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???
Leave
Receiver-Driven Layered Multicast
?????????????????? ??????? ( ??????????? ???????)
???
S.MaCanne et al Receiver-driven Layered
Multicast, SIGCOMM96.
28
?????????? (2)

• Join Experiment

Join?Leave (??????)?????????????????????
??
??
??
detection time
???4
Join
Leave
???3
Join
join timer a (?????)
1??
2??
???2
Join
???1
join timer (????)
TCP ????????????????????
29
?????????? (3)

• Shared Learning

Join ???????????
RL
RH
RL
???
???
RL
S
RL
Join ??
RL

• ????????? Join ???????????
• ?????? Join ????????? Join ???????????

30
?????????? (4)

• RLM ??????

Join ???? (?????)
S
Steady
Join ???? (?????)
Hysterisis
Join ?? ?????
D
H
Drop
???? (?????)
????
M
Measurement
detection time ???