無線與行動多媒體網路 Wireless and Mobile Communication Networks
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無線與行動多媒體網路Wireless and Mobile Communication Networks
國立中山大學 電機系
許蒼嶺 教授
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Multimedia Traffic Characteristics
Traffic Types Traditional Data Traffic Image Voice, High-Quality Sound Full Motion Video Interactive Multimedia
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Data Traffic
Interactive Transactions Banking, Airline Reservation, Insurance Processing 30 Transactions per sec for 1000 Terminals Very Stable and Predictable Traffic Patterns
File Transfer From a Few Kbytes to Hundred Million Bytes Uniform, Regular Transmission of Data at a Constant Rate
Interactive LAN Data Traffic Interactive Response May be Relatively Sensitive to Network Delay
Real Issues for Data Traffic Flow/Congestion Control Error Recovery or Re-Transmission
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IMAGE Traffic
Major Difference from Data Traffic Very Large Block Transfer Response Time Between 1 - 5 sec
Transporting Image Compression Ratio of 4 to 1 on Average Network Load can be Reduced
On-Line Books with Illustrations Consecutive Display of Many Images with 1 - 2 sec Apart Unplanned Load on Network
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Voice and High-Quality Sound
Voice Traffic PCM Encoding Gives 64 Kbps Acceptable End-to-End Delay is about 90 msec Variable-Rate Coding
– Half Duplex– About 60% of One-Way Voice Conversation Consists of Silence
High-Quality Sound CD Quality Stereo (5 Channels) Involves Very High Bit Rate Continuous (Such as Film Soundtrack) Delay Does not Matter as Much as Voice
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Full-Motion Video
A Sequence of Pictures or Frames NTSC : 525 Lines at 30 Frames per sec PAL : 625 Lines at 25 Frames per sec
High Compression Ratio Very Little Different From the Frame Before MPEG-2 : I, B, and P Frames
Timing Considerations Jitter May Affect Presentation Quality
Network Considerations Sufficient Bandwidth via Reservation Acceptable End-to-End Delay
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SVC: Scalable Video Coding Three Types of SVC
Spatial SVC: based on resolution Temporal SVC: based on frame rates Quality SVC: based on PSNR (Peak SNR)
Granularity of SVC Fine Grain Medium Grain Coarse Grain
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SVC: VCL and NAL
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H.264/AVC and SVC
SVC 保留了 H.264/AVC 的 Network Abstraction Layer ( NAL ) NAL units 是 SVC bit stream 的基本結構 NAL 是影片經過 Encoding 後的一段一段資料封包 (Packet) ,此時
的 Packet 還沒有加上 MAC 、 IP 、 UDP 、 RTP 等網路協定的 Headers
NAL 可分成 VCL ( Video Coding Layer ) NAL-unit non-VCL NAL-unit
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SVC Bit Stream 在 SVC bit stream 中,一開始出現的 NAL 是影片解碼資訊
SPS ( Sequence Parameter Set) PPS ( Picture Parameter Set)
最後才是影片內容( Payload) 在每個 NAL 前都會有一個 NAL Header ,參照此 Header 可得知此
Payload 是屬於 Base layer 或 Enhancement layer 的那一層 NAL Header 的內容與欄位用法 :
NUT ( NAL unit type , 2 bits) ,用來指出目前 NAL 的種類。 DID ( Dependency id , 3 bits ),代表畫面大小 (Spatial ) 。 QID ( Quality id, 4 bits ),代表畫面品質 (Quality) 。 TID ( Temporal id, 3 bits ),代表播放速率 (Frame Rate) 。
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RTP Packetization
RFC 3984 定義了三種 RTP Packetization Modes : Single NAL unit Mode Non-interleaved Mode Interleaved Mode
Single NAL unit Mode 代表 RTP packet 中只包含一個 NAL unit 。 Non-interleaved Mode 代表 RTP packet 中的 NAL 必須依照撥放先後
之順序從發送端送出。 Interleaved Mode 則表示 RTP packet 中的 NAL 可不依照播放順序
送出。