IEEE 802 Instructional exercise: Video more than 802.11.


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IEEE 802 Instructional exercise: Video more than 802.11 Moderators: Ganesh Venkatesan (Intel) Alex Ashley (NDS) Ed Reuss (Plantronics) Todor Cooklev (Hitachi) Patrons Ganesh Venkatesan, Intel Organization Alex Ashley, NDS Ltd. Ed Reuss, Plantronics Yongho Seok, LG Hardware Youjin Kim, ETRI
Transcripts
Slide 1

IEEE 802 Tutorial: Video more than 802.11 Presenters: Ganesh Venkatesan (Intel) Alex Ashley (NDS) Ed Reuss (Plantronics) Todor Cooklev (Hitachi)

Slide 2

Contributors Ganesh Venkatesan, Intel Corporation Alex Ashley, NDS Ltd. Ed Reuss, Plantronics Yongho Seok, LG Electronics Youjin Kim, ETRI Emre Gunduzhan, Nortel Harkirat Singh, Samsung Todor Cooklev, Hitachi America Ltd. Sudhanshu Gaur, Hitachi America Ltd. Graham Smith, DSP Group Joe Kwak, InterDigital Don Schultz, Boeing Paul Feinberg, Sony

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OUTLINE Motivation. Why? - Use Cases Challenges. What? - Video and its attributes How? - current 802.11 instruments Further work Limitations in the current 802.11 components Possible territories of work Activities outside 802.11 Conclusions

Slide 4

Motivation: Use Cases Flexibility of not needing to manage wires is a convincing motivation to utilize 802.11 for feature gushing Video Streaming incorporates a wide scope of utilization cases This instructional exercise will concentrate on a subset of utilization cases Solutions to enhance execution for utilization cases toward one side of the range may not be successful to those at the flip side

Slide 5

Use case measurements Uncompressed or Compressed* Unicast , Simulcast, Simulcast w/information, Multicast or Broadcast Low determination, standard definition, High Definition, studio quality Resource contemplations at the renderer (power, CPU, memory) Source from Storage (DVD), realtime , Interactive, time-moved substance , area moved substance Dense versus Sparse feature systems Audio/Video rendered on the same gadget or Audio is rendered at speaker(s) remotely associated with the feature renderer. DRM (substance encoded) or no-DRM (content decoded) * Uses Cases of enthusiasm for the instructional exercise

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Use Cases Projector Home theater (AV beneficiary) Wireless AP (Internet entryway ) DTV Camcorder Home PC Digital camera STB (Cable TV access) DVD player PMP Many applications including … Delivering different HD streams to a few beneficiaries Displaying put away computerized substance from media servers to show gadgets Browsing substance in disseminated gadgets through wide screen televisions

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Use Cases: Multicast Laptop PC Laptop PC Home PC STB (Cable TV access ) AP PMP Content server multicasts sight and sound streams to numerous validated clients. Despite what number of clients get the streams, a solitary WLAN channel is relied upon to be utilized . Content server can be STB, PC, AP, or even any versatile gadgets.

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Use Case: Row of Houses Brick development 2 Compressed Audio/Video Streams HD or SD Typically two bounces for each stream AP conceivably in distinctive room Additional transfer speed for one voice call and moderate information movement Random bursty BE activity

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Use Case: Multiple Occupancy Dwelling Apartments in a skyscraper setup Brick external development, solid floors, drywall inward 2 SD Audio/Video Streams or 1 HD stream Typically two jumps for every stream Additional transmission capacity for one voice call and moderate information movement 9

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The use model for TV is altogether different from the utilization model for the Internet 94 % 8 hours 66 % 42% 33 minutes TVs are seen normally for more hours every day Video over remote experience ought to be tantamount to the present experience over ‘wired’ connection(s) From – The difficulties for Broadcast Television over Wireless in-home systems, Alex Asley and Ray Taylor, NDS Ltd. U.K. Rate of homes Hours every day USA Ireland Internet Television

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Use Cases – Typical Requirements

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Motivation for feature more than 802.11 The quantity of homes with TV is more noteworthy than the quantity of homes with Internet The normal US home has 3 TVs 802.11 must work when each house is at the same time utilizing their system People are utilized to amazing feature The potential business sector is colossal

Slide 13

What is feature? Not all bits are made equivalent Intra (I) casings, Predicted (P) Frames or Bidirectional (B) Frames. MPEG-2 commonly utilizes one I-edge took after by 15 P/B edges to make up a GOP. Feature Sequence Group of Pictures (GoP) Slice Macroblock Picture (Frame) Block (8x8 pixels)

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Transport Stream

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One TS contains sound, feature, information TS Header (4 bytes) has an adjustment field control. This is utilized in addition to other things to recognize the vicinity of PCR (Program Clock Reference) taking after the header.

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How huge are feature outlines? Y-pivot – edge size in bytes

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From feature edges to 802.11 parcels Video outlines ordinarily compass numerous 802.11 bundles TS header may contain PCR – basic for keeping sound/feature in a state of harmony if lost, quality endures significantly The impact of 802.11 bundle misfortune is distinctive relying on its substance

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How are the measurements characterized? Rendered Video Quality Metrics (e.g. Mean Opinion Score) Network execution Metrics (Packet Loss, End-to-End Delay) Link Metrics (PER, throughput) With Video – For a given arrangement of system execution measurements it is difficult to foresee what the relating Video Quality Metric would be For the same set system execution measurements relying upon the feature\'s substance stream, the rendered Video Quality Metric could be distinctive Network Rendered Video Content

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Video Bitrates Constant Bit-rate (CBR) Constant when arrived at the midpoint of over a brief timeframe (e.g. 500ms) Per-picture adjustment of encoding parameters to keep up bitrate Stuffing used to fill to obliged bitrate Variable Bit-rate (VBR) Variable when found the middle value of over a brief span Tends to deliver less variable picture quality (complex scenes can utilize higher bitrates) Statistical Multiplexing A rendition of variable bitrate encoding when numerous streams are put inside a consistent bitrate channel Bitrate is dispensed to every stream in view of encoding requests of every stream

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Packet misfortune If one parcel is lost this will influence other effectively gotten bundles Therefore the proliferation impacts of a bundle misfortune can be noteworthy Single bundle blunder regularly compares to the passing of a little edge (P/B) or the departure of a piece of a major edge Burst bundle misfortune – huge debasement

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Parameters* Max length of time of a lapse occasion <= 16 ms; 1 mistake occasion for every 4 hours Max feature/sound deferral < 200/50 ms; max jitter < 50 ms 21 * From TR-126 www.dslforum.org

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Why is feature an extraordinary issue? As a consequence of pressure: Highly variable bit rate Inter-outline information reliance Some edges are more vital than others Sensitivity to misfortune and defer However the impact of bundle misfortune is content-subordinate Resiliency to bit lapses Error camouflage can be utilized 22

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Video over Wireless Challenges Hey, it is remote Interference, way misfortune Limited number of diverts in unlicensed groups Channel attributes always show signs of change (element) Medium get to non-deterministic (802.11 is initially intended for information) STA physically moves in the same BSS Inter-stream synchronization Between sound rendered at remote speakers and feature Between one feature stream and different sound streams

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Current 802.11 Mechanisms Distributed medium access (EDCA) prioritization Centralized medium access (HCCA) affirmation control and data transfer capacity reservation Direct Link Dynamic channel determination (802.11h) RRM/Management (802.11k/v) HT (802.11n) PHY methods for enhanced vigor

Slide 25

802.11k&v Features for Video 11k: Frame Request/Report recognizes STAs/APs (channel review). 11k: Location (LCI) Request/Report may give area data to sort STAs into in-home or outside. 11k: Noise Histogram and Channel Load 11v: Extended Channel Switch grants moving BSS to chose channel (determination in light of channel study). 11k: Link Measurement and Beacon Request/Report portray beginning connection quality as far as sign level (RCPI) and SNR (RSNI) for feature stream at setup time.

Slide 26

802.11k elements to screen quality 11k: Transmit Stream Measurement Request/Report for direct feature stream checking utilizing activated reports (cautions) on transmit stream MSDU retries, disposes of, disappointments or long defer. 11k: Link Measurement Request/Report to track continuous feature join quality regarding sign level (RCPI) and SNR (RSNI) for STA to STA streams. 11k: Beacon Request/Report to track progressing feature join quality regarding sign level (RCPI) and SNR (RSNI) for AP to STA streams with contingent reporting (alarms). 11v: Presence Request/Report may distinguish onset of movement of transmitting or accepting STA to show changing connection conditions.

Slide 27

Limitations in current 802.11 components Limited prioritization Lack of between layer correspondence Limited arrangement of QoS parameters Limited ability to progressively change QoS parameters Lack of substance particular strategies

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Possible ranges of work MAC-level procedures Selective Repetition to alleviate bundle misfortune Smart parcel drop Finer prioritization among streams and inside of one stream Content-particular systems QoS strategy (setting up, observing, adjustment) Inter-Layer correspondence (Vertical cooperation) PHY MAC-higher layers

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Other information MPEG2 Packetized Audio Elementary Stream MPEG2 Packetized Video Elementary Stream PHY outline MAC outline PHY outline MAC outline Possible arrangements: Illustration MPEG2 Packetized Transport Stream Dynamic QoS Finer granularity need levels Content mindful security, transmission, retransmission, and so forth … Content-mindful PHY adjustment Beamforming/STBC Coding/Modulation, and so on. …

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Multiple Priority Levels Inter-stream and Intra-Stream needs Real-time feature has diverse QoS prerequisites contrasted with put away media. Current standard has procurement for feature access class and gives one support of a wide range of feature including constant feature, put away media and so on Possible extension for development Use diverse arrang

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