Triple Play Services over Mobile WiMAX Raj Jain Washington University in Saint Louis Saint Louis, MO 63130 Jain@cse.wustl.edu Presented at MWG Meeting, Athens, April 29, 2008 These slides are available on-line at: http://www.cse.wustl.edu/~jain/wimax/3play.htm 1
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
Overview! Triple Play: What and Why?! Protocol Model and Parameters! Factors Affecting Capacity! Capacity Estimation 3
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
VoIP Internet Protocol Stack IPTV RTP UDP/TCP IP MAC 802.3 PHY 802.3 RTP UDP/TCP IP UDP/TCP IP classification MAC 802.3 PHY 802.3 A/V Content RTP UDP/TCP IP 12B 8B 20B 14B WiMAX DL frame duration 5 msec, UL WiMAX BS IP ASN MAC 802.3 PHY 802.3 MAC 802.16 PHY 802.16 WiMAX Radio MAC 802.16 PHY 802.16 WiMAX Radio 5
! Channel width: 10 MHz System Parameters! OFDMA Frame Size: 5 ms! Duplexing: TDD! DL:UL Ratio = 2:1! Subchannelization: PUSC 6
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
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
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
Number of users 1000 100 10 1 Effect of Scheduler VoIP Capacity 120 216 384 432 456 480 504 504 504 528 528 32 40 44 44 46 46 46 46 46 46 46 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
VOIP Capacity VoIP Capacity Number of users 1000 100 10 96 120 168 216 384 432 456 480 504 504 504 528 528 408 408 432 456 456 456 480 480 336 1 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
Video Displays 42 16x9 SDTV (1 Mbps) 26 4x3 SDTV (850 kbps) Laptop (700-800 kbps) 12 Palmtop (324 kbps)
Mobile TV Mobile TV Capacity Number of users 100 10 1 2 2 4 4 8 12 12 QPSK 1/8 QPSK 1/4 QPSK 1/2 QPSK 3/4 8 16 16 1/2 20 2/3 22 24 24 28 32 34 22 3/4 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
Internet Data Access Internet Data Capacity Number of users 1000 100 10 50 50 100 100 200 250 250 150 350 400 450 450 550 550 600 400 400 400 500 550 550 300 1 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
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
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 802.16e 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 2008. 16