Transcript - Yeungnam Univ. Adavanced Networking Technology

2008 YU-ANTL Lab Seminar
QoS Support in a Wireless Home Network
(UPnP and WLAN Architecture overview)
December 23, 2008
Shahnaza Tursunova
Advanced Networking Technology Lab. (YU-ANTL)
Dept. of Information & Comm. Eng, Graduate School,
Yeungnam University, KOREA
(Tel : +82-53-810-2497; Fax : +82-53-810-4742
http://antl.yu.ac.kr/; E-mail : [email protected])
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Outline
 Introduction
 Related work
 WLAN QoS
 IEEE 802.11e EDCA
 IEEE 802.11e HCCA
 WMM
 QoS management architecture for 802.11-based wireless networks
 UPnP QoS Architecture
 QoS-Enabled Home Network
 Admission Control mechanism
 Run-time monitoring, feedback, and adaptation
 Demo scenario and results
 Conclusion
 References
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Introduction
 Motivation
 IEEE 802.11 Wireless LAN (WLAN) technologies are widely used in
homes to distribute the broadband Internet connection
 Do not require installation of new cabling
 Equipment required is relatively inexpensive
 Capacity is enough to support traditional applications
– Web surfing, file downloading
 Challenges
 Converged home network environments
 Data network is converging with the multimedia and entertainment
applications (voice, TV, gaming)
 Require the network top support timely delivery of data
– Delay sensitive
 Currently used WLAN technologies do not support QoS provisioning
 Bandwidth limitation, radio channels are error prone (multipath,
shadowing, interference, and so forth)
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Introduction (2)
 In this presentation
 Review the state of the art technologies that can be used to provide
QoS in the converged home networks
 WLAN QoS and UPnP QoS architectures
 Proposed solution for providing QoS in home environment
 Demo scenario and experimentation
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Related work
 QoS mechanisms defined in IEEE 802.11e
 Enhanced Distributed Channel Access (EDCA)
 Based on IEEE 802.11 Distributed Coordination Function (DCF)
– Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA)
 Backoff time depends on the access category (AC)
– BK (Background), BE (Best Effort), VI (Video) and VO (Voice)
 Contention based access mechanism and cannot guarantee QoS in case of excess
traffic in the network
 Hybrid Coordination Function (HCF) Controlled Channel Access (HCCA)
 Based on Point Coordination Function (PCF)
 Polled, contention-free access to the medium
– Hybrid coordinator (HC) takes control of the channel and assigns the transmission opportunities
to stations
 Is not widely supported on the market due to its complex nature
 Wi-Fi Multimedia (WMM)
 Specification for WLAN QoS from the Wi-Fi Alliance
 Uses EDCA as its access method
 Most widely supported QoS mechanism on the market
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Related work (2)
 Survey the main QoS enhancement schemes that have been proposed for
802.11 WLAN in [1]
 Reviewed lack a management layer in the wireless network to react dynamically to the
continuous fluctuation of radio resource
 QoS support for a mobile ad hoc network is presented in [2]
 Solution requires some modifications to the link layer
 [3] gives comparison of several existing QoS-aware middleware systems in
terms of




QoS specifications
QoS translation and compilation
QoS enforcement
QoS adaptation
 Integrated middleware QoS framework is described in [4]
 Requires the introduction of specific modules to both the end-hosts and the
intermediate nodes
 Transparent QoS provisioning solution for AV services utilizing UPnP and
basic IEEE 802.11 MAC is presented in [5]
 Media distribution system supporting QoS using UPnP QoS and IEEE
802.11p/Q priorities is presented in [6]
 Some methods that monitor network conditions based on periodically
exchanging of status information and metrics among the nodes
 Unnecessary resource consumption, and periodic unavailability of the shared
communication
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Related work (3)
 UPnP QoS Architecture
 Easy and seamless connectivity between standalone networked devices
from different vendors
 Provides services for policy management and network resource
allocation
 Middleware layer between the application and the network technologies
 Does not define the actual implementation or methods for policy
enforcement, decision making, or QoS configuration
 Three separate services that together comprise UPnP QoS framework
 QoS Device
– Responsible of configuring the lower level QoS for the device it is associated
 QoS Policy Holder
– Stores policies for the treatment of particular traffic types
 QoS Manager
– Manages the QoS configuration of the network
– Receives QoS requests from control points, QoS Policy Holder
– Instructs the QoS Devices how to configure the network
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Related work (4)
 UPnP QoS architecture
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Related work (5)
 Games@Large (GaL)
 European Information Society Technologies (IST) Integrated Project (IP)
intending to research, develop, and implement a novel platform for
gaming
 Challenge game consoles by making digital games ubiquitously
available to users in environments
 Platform is not restricted to be used by dedicated devices
 GaL architecture will be based on distributing the game processing
between the game server and client devices
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QoS-Enabled Home Network
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QoS-Enabled Home Network (2)
 Interaction diagram depicting interactions of agents involved in the
QoS management system
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QoS-Enabled Home Network (3)
 Admission Control mechanism
 Performed by QoSManager
 Decide if a new stream can enter the network and how many resources can be
allocated to it
 Proposed procedure is based on the estimation of the end-to-end
available WLAN bandwidth
 Estimate the available bandwidth by means of an active probing tool [7]
 Common way to ado Admission Control
 Reject requests by new streams to enter the network when the resources
are close to be depleted
 Main idea of proposed Admission Control
 Allow the new high priority stream to enter the network
– If there are some already running streams at low priority: an appropriate amount
of network resources can be revoked to low priority stream and reallocated to the
new high priority one
 In order to revoke the usage of a portion of the allocated bandwidth fro a
stream, originating streaming server should be able to apply source
transrating
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QoS-Enabled Home Network (4)
 Admission Control mechanism (cont.)
 QoSManager estimated the overall available bandwidth for reallocation
 the available bandwidth - retrieved through the AST_GetAvailableBW
 the actual aggregate throughput flowing through all the active QoSDevices
– QoSManager needs to know the amount of bandwidth which is really used by each
active QoSDevice
– Accomplished by invoking AST_GetQoSMetrics action
 QoSManager has to distribute the bandwidth budget among the existing
streams and the new incoming one
 Based their relative priorities
– Streams with higher priority could be allowed to run at full rate
– Streams with lower priority could be transtrated or even stopped
 Final result of the Admission Control procedure
 Share of already allocated resources could be released and reallocated to the
new incoming stream
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QoS-Enabled Home Network (5)
 Run-time monitoring, feedback, and adaptation
 Run-time monitoring
 To face the worsening of the wireless link quality while the A/V streams run
 Even if AC ensures that new streams will now cause the saturation of the wireless
resources, it is still possible that new interfering sources arise after A/V stream
admission
 Proposed solution is based on the notification of the values of relevant
metrics
 If a QoSDevice received notices that the some QoS metrics falls below an alarm
threshold value, these events are propagated by means of UPnP QoS messages
to the QoSManager
– Indicate decay of wireless resources
– QoSManager could decide to collect other metrics by invoking the AST_GetQoSMetrics
» Try to compute a new set of streaming parameters
– New parameter set is propagated by calling the AST_SetTrafficQoSParameters
» Allowed but rate of a stream
 When better network condition is available, the QOSManager is able to detect
improvements
– Periodically checking the channel status
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Demo scenario and results
 Scenario #1
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Demo scenario and results (2)
 Admission Control mechanism
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Demo scenario and results (3)
 Admission Control Mechanism (cont.)
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Demo scenario and results (4)
 QoS continuous monitoring (QCM)
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Demo scenario and results (5)
 Scenario #2
 Laptops were equipped with D-Link DWL-G650 IEEE 802.11g WLAN
radios and MadWiFi Linux driver was used
 Parameters
 Station 1
– 5Mbps CBR UDP traffic (voice)
– From 0 s to 30 s
 Station 2
– 20.5Mbps TCP traffic (FTP, background)
– From 10 s to 20 s
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Demo scenario and results (6)
 Throughput results
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Demo scenario and results (7)
 RTT
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Conclusion
 In this presentation
 Reviewed the state-of-the are technologies related to wireless networks
with QoS support for home networks
 A framework to manage QoS for A/V streaming services in a WLANbased digital home networks has been presented
 Optimally accomplish QoS requirements on the based of relevant metrics at
network and application level
 Estimate the available WLAN bandwidth at any time
 Propagate the relevant metrics
– Event notifications among the appropriate network devices
 Capability of multimedia servers to change the video encoding rate on-the-fly
 Not required to run on specific hardware/MAC enhancement
 Experimental to confirm the adequacy of WMM to G2L architecture
 Competing traffic did not affect the real-time application performance at all
 However, WMM cannot support QoS in existence of excess load on the
highest priority
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References
[1] Q. Ni, L. Romdhani, T. Turletti, “A Survey of QoS Enhancements for IEEE 802.11 Wireless LAN,”
Journal of Wireless Communications and Mobile Computing, Wiley. August 2004, Volume 4, Issue
5: pp. 547-566.
[2] L. Chen, W. Heinzelman, “Network Architecture to Support QoS in Mobile Ad Hoc Networks,” IEEE
International Conference on Multimedia and Expo, June 2004, Volume 3, pp 1715-1718.
[3] K. Nahrstedt, D. Xu, D. Wichakakul, B. Li, “QoS-aware Middleware for Ubiquitous and
Heterogeneous Environments,” IEEE Communications Magazine November 2001, Volume 39,
Issue 11: pp. 140-148.
[4] C. S. Ong, Y. Xue, K. Nahrsdedt, “A Middleware for Service Adaptation in Differentiated 802.11
Wireless Networks,” in Proceedings of the Workshop on Coordinated Quality of Service in
Distributed Systems, (COQODS) 2004.
[5] Y. S. Sun, C-C. Y, and M. C. Chen, “Content-aware automatic QoS provisioning for UPnP AV-based
multimedia services over wireless LANs”, Fifth International Conference on Computational
Science (ICCS), May 2005, Atlanta, GA, USA, pp. 444-452.
[6] S-G. Choi, D-O. Kang, J-W. Lee, “A media distribution system supporting priority-based QoS in a
home network”, The 8th International Conference on Advanced Communication Technology
(ICACT 2006), Feb 2006, Phoenix Park, Korea, vol 3, pp. 1532-1536.
[7] M. Jain and C. Dovrolis, “Pathload: A Measurement Tool for End-To-End Available Bandwidth,” in
Proceedings of Passive and Active Measurements (PAM) Workshop, March 2002, pp.14-25.
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Thank you for your attention!
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