Triple Play Services over Mobile WiMAX

Transcription

1 Triple Play Services over Mobile WiMAX Raj Jain Washington University in Saint Louis Saint Louis, MO Presented at MWG Meeting, Athens, April 29, 2008 These slides are available on-line at: 1

2 Contributors! Kemal Ozdemir, Francis Retnasothie, Logus Broadband Wireless! Raj Jain, Chakchai So-In,! Shyam Parekh, Alcatel-Lucent! Alan Moskowitz, MobiTV! Krishna Ramadas, Venturi Wireless! Mano Vafai, Wichorus Service Providers, Equipment Vendors, Academic Institution Team 2

3 Overview! Triple Play: What and Why?! Protocol Model and Parameters! Factors Affecting Capacity! Capacity Estimation 3

4 Why Triple Play?! Three Key Mobile Services: " Voice, Video, and Internet! Video and entertainment are key to future growth of broadband key revenue generators! Legacy mobile technologies, designed for voice, have difficulty managing video workload! WiMAX Operators need analytical data to plan their capacity and justify their investments 4

5 VoIP Internet Protocol Stack IPTV RTP UDP/TCP IP MAC PHY RTP UDP/TCP IP UDP/TCP IP classification MAC PHY A/V Content RTP UDP/TCP IP 12B 8B 20B 14B WiMAX DL frame duration 5 msec, UL WiMAX BS IP ASN MAC PHY MAC PHY WiMAX Radio MAC PHY WiMAX Radio 5

6 ! Channel width: 10 MHz System Parameters! OFDMA Frame Size: 5 ms! Duplexing: TDD! DL:UL Ratio = 2:1! Subchannelization: PUSC 6

7 Factors Affecting Capacity! Location: Terrain, foliage, buildings Signal to interference and noise ratio (SINR) Modulation and coding schemes! Urban/Sub-urban/Rural Regions: " Urban Higher capacity " Rural Longer reach " Suburban! Mobile Speed: High speed Doppler shift Inter-carrier interference Lower MCSs 7

8 Factors Affecting Capacity (Cont)! Frequency Band: " Lower frequencies have longer reach " 700 MHz provides provides larger coverage area than 2.5 GHz Good for rural deployments " Lower frequencies require larger antenna and antenna spacing MIMO difficult " Lower frequencies Smaller channel width! Handoffs: 50 ms for real time applications, 3-10 seconds for non-real-time 8

9 Factors Affecting Capacity (Cont)! Scheduling " Key to WiMAX performance and QoS " Vendor specific " Aggregating small payloads can increase the capacity by an order of magnitude! Header compression: " Robust Header Compression (RoHC) " Header suppression! Silence suppression! ARQ/HARQ 9

10 Number of users Effect of Scheduler VoIP Capacity QPSK 1/8 QPSK 1/4 QPSK 1/2 QPSK 3/4 1/2 2/3 3/4 1/2 2/3 3/4 5/6 Modulation and Coding Schemes VoIP VoIP 10MHz 10MHz Simple Scheduler Enhanced Scheduler! Proper aggregation and scheduling can increase the performance by an order of magnitude 10

11 VOIP Capacity VoIP Capacity Number of users QPSK 1/8 QPSK 1/4 QPSK 1/2 QPSK 3/4 1/2 2/3 3/4 1/2 2/3 3/4 5/6 Modulation and Coding Schemes VoIP 8.75MHz VoIP 10MHz! Limited by UL capacity 11

12 Video Displays 42 16x9 SDTV (1 Mbps) 26 4x3 SDTV (850 kbps) Laptop ( kbps) 12 Palmtop (324 kbps)

13 Mobile TV Mobile TV Capacity Number of users QPSK 1/8 QPSK 1/4 QPSK 1/2 QPSK 3/ /2 20 2/ /4 Modulation and Coding Schemes 22 1/2 26 2/3 28 3/4 32 5/6 Mobile TV 8.75MHz Mobile TV 10MHz! H.264 MPEG-4 13

14 Internet Data Access Internet Data Capacity Number of users QPSK 1/8 QPSK 1/4 QPSK 1/2 QPSK 3/4 1/2 2/3 3/4 1/2 2/3 3/4 5/6 Modulation and Coding Schemes Data 8.75MHz Data 10MHz! 3GPP HTTP workload 14

15 Summary! WiMAX systems provide a good performance on Voice, Video, and Data! Voice traffic generates small packets. 10X performance with Aggregation and scheduling! Video throughput distinguishes WiMAX from other legacy mobile networking technologies 15

16 References! WiMAX Forum White paper, Triple Play Services including Mobile TV, VoIP, and Internet over Mobile WiMAX Networks, April 2008.! C. So-In, R. Jain, A. Tamimi, Capacity Estimation of IEEE e Mobile WiMAX Networks, Submitted to IEEE Communications Magazine, April 2008.! C. So-In, R. Jain, A. Tamimi, Seasonal ARIMA Models of Video Traffic for Mobile WiMAX and Other Wireless Broadband Access Technologies, Submitted to ACM Multimedia 2008 conference, April