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Doc.: IEEE 802.11-07/2294r1 Submission August 2007 Alex Ashley, NDS LtdSlide 1 Topics for VTS PAR(s) Date: 2007-08-07 Authors:

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Presentation on theme: "Doc.: IEEE 802.11-07/2294r1 Submission August 2007 Alex Ashley, NDS LtdSlide 1 Topics for VTS PAR(s) Date: 2007-08-07 Authors:"— Presentation transcript:

1 doc.: IEEE 802.11-07/2294r1 Submission August 2007 Alex Ashley, NDS LtdSlide 1 Topics for VTS PAR(s) Date: 2007-08-07 Authors:

2 doc.: IEEE 802.11-07/2294r1 Submission August 2007 Alex Ashley, NDS LtdSlide 2 Abstract This presentation suggests some topics that could form the basis of one or more PARs for the Video Transport Streams task group. These topics are based on previous inputs to IEEE 802.11 that highlighted issues with the current 802.11 MAC.

3 doc.: IEEE 802.11-07/2294r1 Submission August 2007 Alex Ashley, NDS LtdSlide 3 Introduction Checking the 8941 documents on the 802.11 document server from the last three years, 21 presentations seemed to be related to the work of the VTS study group and described specific limitations with 802.11 The following slides group these presentations in to five known issues themes Following this is a proposal of four topics for the VTS task group that covers these themes

4 doc.: IEEE 802.11-07/2294r1 Submission August 2007 Alex Ashley, NDS LtdSlide 4 Known Issues with 802.11 MAC Jitter –Video and voice traffic is jitter sensitive –802.11 MAC level retransmissions, DCF/EDCA channel access rules and 11n AMPDU cause non-deterministic delays EDCA scalability –Multiple streams all sharing the same AC HCCA and PCF with overlapping BSS –Collisions during controlled access phase

5 doc.: IEEE 802.11-07/2294r1 Submission August 2007 Alex Ashley, NDS LtdSlide 5 Known Issues with 802.11 MAC Compatibility with 802.1 –Support for 802.1avb stream reservation –Reflection issues with 802.1 routing –Packet based behaviour (priority, drop eligibility) Multicast –QoS for multicast streams –Delivery of A/V to multiple devices simultaneously (e.g. display + speakers)

6 doc.: IEEE 802.11-07/2294r1 Submission August 2007 Alex Ashley, NDS LtdSlide 6 Jitter Video and voice traffic is jitter sensitive –802.11 MAC level retransmissions, DCF/EDCA channel access rules and 11n AMPDU cause non-deterministic delays Jitter can be smoothed by buffering, but this is undesirable for video and voice traffic Use an FEC to reduce / remove retransmissions? Use a deterministic channel access method (HCCA/PCF) ? 05/0632r1 - 802.11 MAC extensions for high rate Video 05/0910r1 - 802.11 for video transmission 06/0322r0 - Video Use Cases 06/0360r0 - Update on HD Video over WLAN 07/0676r0 - Video over 802.11 Research 07/2256r2 - Minutes of 802.11 VTS Study Group

7 doc.: IEEE 802.11-07/2294r1 Submission August 2007 Alex Ashley, NDS LtdSlide 7 EDCA Scalability Multiple streams all sharing the same AC As number of streams increase, likelihood of collisions increase –Collisions cause exponential back-off and rate adaptation Adjust EDCA TXOP_limit based on actual / predicted video frame type? Modify AIFSN? 05/0632r1 - 802.11 MAC extensions for high rate Video 05/0910r1 - 802.11 for video transmission 06/0039r1 - On video over 802.11 06/0713r1 - MAC improvement using random AIFSN 06/0892r1 - Multimedia Challenges for IEEE802.11 07/0105r0 - Requirements towards video over 802.11 07/0400r1 - Audio/Video Streaming over 802.11 07/2157r1 - Limitation of EDCA and HCCA for Video Transmission

8 doc.: IEEE 802.11-07/2294r1 Submission August 2007 Alex Ashley, NDS LtdSlide 8 HCCA and PCF with overlapping BSS Collisions during controlled access phase can cause large number of packets to be lost and time on the medium to be lost Maybe a (partial?) solution in TGv ? 05/0505r0 - Access Point Coordination 06/0691r0 - Multi-channel Direct Link Protocol for HD Video 07/0676r0 - Video over 802.11 Research 07/2115r0 - Access Point Collaboration 07/2157r1 - Limitation of EDCA and HCCA for Video Transmission

9 doc.: IEEE 802.11-07/2294r1 Submission August 2007 Alex Ashley, NDS LtdSlide 9 Compatibility with 802.1 Support for 802.1avb stream reservation protocol Reflection issues with 802.1 routing IEEE 802.1Qad added support for discard eligibility –The ability of a system (a network node, a station, an access point) to selectively drop frames when congested. 06/0144r1 - Video Testing Methodology 06/0898r2 - 802.11 Amendments to Support CE Applications 06/1021r1 - WLAN for Next Generation AV 07/0693r0 - Supporting Drop Eligibility in IEEE 802.11 MAC 07/2233r0 - Wireless Bridge Common Practices

10 doc.: IEEE 802.11-07/2294r1 Submission August 2007 Alex Ashley, NDS LtdSlide 10 Multicast 802.11e standard does not provide QoS for multicast For multicast transmission to several speakers, not only the speakers must be synchronized among themselves, but they must be synchronized with the video as well 05/0420r1 - Multicast over WLAN 06/0892r1 - Multimedia Challenges for IEEE802.11 06/0898r2 - 802.11 Amendments to Support CE Applications 07/0105r0 - Requirements towards video over 802.11

11 doc.: IEEE 802.11-07/2294r1 Submission August 2007 Alex Ashley, NDS LtdSlide 11 Proposed PAR Topics Based on analysis of documents from the last 3 years, the following topics should be addressed by the 802.11 VTS task group Improved 802.1 support Modified ACK & FCS behaviour Modified EDCA BSS overlap

12 doc.: IEEE 802.11-07/2294r1 Submission August 2007 Alex Ashley, NDS LtdSlide 12 Improved 802.1 support MAC layer enhancements to: Add support for 802.1avb stream reservation protocol Add support for 802.1Qad discard eligibility Specify four address behaviour?

13 doc.: IEEE 802.11-07/2294r1 Submission August 2007 Alex Ashley, NDS LtdSlide 13 Modified ACK & FCS behaviour MAC layer enhancements to provide a hook for higher- layer error handling techniques –E.g. video decoder error concealment, application level FEC –Allows frames with payload bit-errors to be used –Allows choice of error handling technique (e.g. FEC algorithm) –Still allows 802.11 frame headers to be validated –Possibly integrated with block-ACK? Removal of retransmissions could provide a solution for jitter Could also be used to improve quality of multicast delivery

14 doc.: IEEE 802.11-07/2294r1 Submission August 2007 Alex Ashley, NDS LtdSlide 14 Modified EDCA MAC layer enhancements to EDCA QoS mode for AIFSN and TXOP values –Improve the scalability of EDCA by modifying AIFSN Random? Based upon information in the packet? –Use 802.1q information to modify TXOP?

15 doc.: IEEE 802.11-07/2294r1 Submission August 2007 Alex Ashley, NDS LtdSlide 15 BSS overlap Management layer enhancements to allow overlapping BSS to avoid CAP collisions –No MAC layer modifications –Ideally, no modifications to non-AP STAs –Allow exchange of TSPECs between APs? –Inter-BSS admission control? This topic needs collaboration with TGv –cf ECSA in TGn, TGv and TGy

16 doc.: IEEE 802.11-07/2294r1 Submission August 2007 Alex Ashley, NDS LtdSlide 16 Conclusions This presentation describes four topics that could be addressed by a VTS task group Each topic has had several independent submissions describing the need for an 802.11 solution Each topic could have a very narrow scope to enable timely delivery of a technical solution

17 doc.: IEEE 802.11-07/2294r1 Submission August 2007 Alex Ashley, NDS LtdSlide 17 References (1/2) 05/0505r0 - Access Point Coordination 05/0632r1 - 802.11 MAC extensions for high rate Video 05/0910r1 - 802.11 for video transmission 06/0039r1 - On video over 802.11 06/0144r1 - Video Testing Methodology 06/0322r0 - Video Use Cases 06/0360r0 - Update on HD Video over WLAN 06/0691r0 - Multi-channel Direct Link Protocol for HD Video 06/0713r1 - MAC improvement using random AIFSN# 05/0420r1 - Multicast over WLAN 06/0892r1 - Multimedia Challenges for IEEE802.11

18 doc.: IEEE 802.11-07/2294r1 Submission August 2007 Alex Ashley, NDS LtdSlide 18 References (2/2) 06/0898r2 - 802.11 Amendments to Support CE Applications 06/1021r1 - WLAN for Next Generation AV 07/0105r0 - Requirements towards video over 802.11 07/0400r1 - Audio/Video Streaming over 802.11 07/0676r0 - Video over 802.11 Research 07/0693r0 - Supporting Drop Eligibility in IEEE 802.11 MAC 07/2115r0 - Access Point Collaboration 07/2157r1 - Limitation of EDCA and HCCA for Video Transmission 07/2233r0 - Wireless Bridge Common Practices 07/2256r2 - Minutes of 802.11 VTS Study Group

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