Transcript July 2006 - Mentor

July 2006
doc.: IEEE 802.11-06/0898r1
802.11 Amendments to Support CE Applications:
Technical Requirements
Date: 2006-07-09
Authors:
Name
Company
Address
Phone
Email
Scott S. Lee
Chil-Youl Yang
Sukjin Yun
Eric K. Cho
Seyoung Shin
Sung-Chul Park
Samsung Electronics
Suwon, Korea
+82-31-200-8779
+82-31-200-9328
+82-31-200-3419
+82-31-200-9179
+32-31-200-3847
+82-31-200-9252
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
Rakesh Taori
Sung-Won Lee
Hongkyu Jeong
Samsung Advanced
Institute of Technology
Yongin, Korea
+82-31-280-9635
+82-31-280-9628
+82-31-280-9549
[email protected]
[email protected]
[email protected]
Chiu Ngo
Huai-Rong Shao
Samsung Information
System America
San Jose, CA
+1-408-544-5633
[email protected]
[email protected]
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Submission
Slide 1
Scott S. Lee, Samsung
July 2006
doc.: IEEE 802.11-06/0898r1
Abstract
• This submission presents technical requirements that
should be met in order to support reliable transmission
of high quality audio and video contents over WLAN.
These requirements, which are derived from use
cases that are well recognized in a CE context, include
reliable delivery of broadcast and multicast frames,
time synchronization, and hooks for DRM support.
Submission
Slide 2
Scott S. Lee, Samsung
July 2006
doc.: IEEE 802.11-06/0898r1
Overview
• Trends of CE devices
• WLAN CE applications
• Technical requirements
Wireless Connectivity
• Conclusion
Submission
Slide 3
Scott S. Lee, Samsung
July 2006
doc.: IEEE 802.11-06/0898r1
Trends of CE Devices
• More and more CE devices become to support wireless
connectivity.
• Network-enabled and application-specific
– Simplified or even no network layers
– Network functions only required by specific applications
• Carrying broad ranges of contents
– Various video and audio types of different qualities
– Casting many different constraints for QoS:
bandwidth, reliability, latency, etc.
• Growing computing power but still limited
– Not general-purpose machines
– Equipped with only minimal computing power
Submission
Slide 4
Scott S. Lee, Samsung
July 2006
doc.: IEEE 802.11-06/0898r1
WLAN CE Applications
•
CE devices are ready to adopt WLAN for their network connectivity.
– Wireless home network environment
– Portable devices with wireless connectivity
Projector
Game console
MP3 player
Laptop PC
Home theater
(AV receiver)
PMP
Wireless AP
(Internet gateway)
Home PC
DTV
Camcorder
STB (Cable TV access)
Submission
Digital camera
DVD/BD player
Slide 5
Scott S. Lee, Samsung
July 2006
doc.: IEEE 802.11-06/0898r1
WLAN CE Applications
PMP
Camcorder
Digital camera
Home PC
DTV
Projector
Wireless AP
(Internet gateway)
STB (Cable TV access) DVD/BD player
•
Home theater
(AV receiver)
Already well recognized applications
–
–
–
–
Submission
Delivering multiple HD streams to several receivers
Displaying stored digital contents from media servers to display devices
Browsing contents in distributed devices through big screen TVs
and many more.
Slide 6
Scott S. Lee, Samsung
July 2006
doc.: IEEE 802.11-06/0898r1
WLAN CE Applications
Infrastructure
Topology
Ad hoc
Service
type
Cable set-top
Network coordination with conventional AV set-top box
IP set-top
IP gateway-centric network management environment
Point-to-point
One-to-one direct communication (single hop)
End-to-end
Delivering data over multiple intermediate nodes (multi-hop)
Ex) Relaying data through participating wireless nodes
Unicast
1-to-1 communication
Ex) Simple AV streaming or data communication btw. devices
Broadcast / Multicast
1-to-many communication
Ex) Servicing the same AV to multiple devices simultaneously
Best-effort
Legacy packets of data networks
Ex) Control signals btw. CE devices
Data type
Compressed
Encoded AV streams with time latency of codec
Ex) AV streaming btw. STB and TV
Uncompressed
Raw AV data without codec
Ex) Streaming btw. game console and TV
Multimedia
•
Examples of specific applications
–
–
–
Submission
Broadcasting multimedia by utilizing single reliable channel and achieving scalability
Delivering contents to multiple devices in time synchronized manner
Supporting DRM with WLAN
Slide 7
Scott S. Lee, Samsung
July 2006
doc.: IEEE 802.11-06/0898r1
Broadcasting Multimedia
•
Target scenario
– Content server broadcasts
multimedia streams to many
authenticated users.
– Regardless of how many users
receive the streams, a single
WLAN channel is expected to be
used.
– Content server can be STB, PC,
AP, or even any portable devices.
– The streams must be delivered
with high reliability (i.e., QoS
provisioning).
Laptop PC
PMP
PMP
Laptop PC
AP
Home PC
PMP
STB (Cable TV access)
Submission
Slide 8
PMP
Scott S. Lee, Samsung
July 2006
doc.: IEEE 802.11-06/0898r1
Multimedia Broadcast Service
Wireless Cafeteria
Wireless SBC
Wireless Car Theater
Sports
Music
Drama
Game
In the morning, Joe enjoys
watching news over coffee with
his girlfriend at a cafeteria.
Submission
Joe works for Samsung. Joe and
his team members watch SBC
(Samsung BroadCast) through
their laptops or wireless monitors.
Slide 9
Joe heard about new movie,
‘Superman returns.’ In the
evening, at a wireless car theater,
he watches the movie with his
own PMP.
Scott S. Lee, Samsung
July 2006
doc.: IEEE 802.11-06/0898r1
Time Synchronized Delivery
•
Target scenario
– Content server delivers AV streams
to each different type of wireless
devices.
– The AV streams have to be
synchronized to avoid the “lip
sync” problem.
DTV
“One”
AP
“Two”
“Three”
Home theater
(AV receiver)
STB (Cable TV access)
Submission
Slide 10
Scott S. Lee, Samsung
July 2006
doc.: IEEE 802.11-06/0898r1
Home Theater
Lee wants to enjoy HD movies with
his wireless home theater system.
But he feels that the picture and
sound are slightly not synchronized.
Contents server
Video out
Audio out
tC
Submission
tB
Slide 11
Scott S. Lee, Samsung
July 2006
doc.: IEEE 802.11-06/0898r1
DRM Support via WLAN
DVD/BD player
• Target scenario
– In residential or public areas,
WLAN is deployed in CE
devices.
– Through a set-top box or a
hotspot, pay-per-view movies
are played.
– All the devices must comply
with DRM policy.
STB
(cable TV access)
PMP
Residential area
DTV
Home PC
Laptop
PC 1
Digital media
server
AP
Slide 12
PMP 1
Public area
Laptop
PC 2
PMP 2
Laptop
PC 3
Submission
Laptop PC
PMP 3
Scott S. Lee, Samsung
July 2006
doc.: IEEE 802.11-06/0898r1
Pay-Per-View Service
Cable TV company sends
Star Wars Episode 3
to Kevin’s house with DRM tag
“Copy Once.”
DTV
Cable
Copy Once
STB (AP)
Room 2
Copy No more
Home theater
DVD R/W player
Room 2
Copy No more
PMP
Living room
Living room
Room 1
Kevin is watching Star Wars with his
girlfriend, Heather in the couch,
recording the movie in a DVD.
Submission
Slide 13
Don, Kevin’s twin brother, is a big fan
of Star Wars. Now, he is also watching
it with 5.1 channel home theater system
in his room.
Room 1
Cynthia, Kevin’s sister, doesn’t want to
bother Kevin and Heather. So, she is
watching the same movie with her PMP
in her bedroom.
Scott S. Lee, Samsung
July 2006
doc.: IEEE 802.11-06/0898r1
Technical Requirements
• Reliable Multicast and Broadcast
– Sharing scarce wireless channels for the same contents (i.e., scalability)
– Creating many new service models (e.g., screen-less theater)
• Time synchronization
– Low-end devices can be provided with synchronization support from
WLAN.
– If every data frame carries timing information, it can be processed at the
right time.
• Hooks for DRM
– Digital content providers supply customers with their contents without any
concerns of illegal copy issues.
Submission
Slide 14
Scott S. Lee, Samsung
July 2006
doc.: IEEE 802.11-06/0898r1
Conclusion
• To support well-recognized CE applications using
WLAN, the following requirements emerge:
– Reliable multicast and broadcast
– Time synchronization
– Hooks for DRM
• We support the creation of a new Study Group to assess
how the above requirements can be addressed.
Submission
Slide 15
Scott S. Lee, Samsung