TeNeT Group IIT-M 18/29/2015 Broadband Quality of Service Prof. Timothy Gonsalves Dept of Computer Science & Engg TeNeT Group, IIT-Madras Mar 2008 TeNeT.

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Presentation transcript:

TeNeT Group IIT-M 18/29/2015 Broadband Quality of Service Prof. Timothy Gonsalves Dept of Computer Science & Engg TeNeT Group, IIT-Madras Mar 2008 TeNeT Group IIT-M 1

28/29/2015 Overview The users The technologies The QoS metrics The evaluation methodology

TeNeT Group IIT-M 38/29/2015 The Next Billion Dense urban areas – 10,000 people/sq. km Sparse rural areas –Village every 3-10 km –Population 1,000-25,000 –Within 25 km of fibre –700 m in India ARPU today for 100m subscribers: Rs. 350 ($7) ARPU tomorrow for next billion: Rs. 100 ($2)

TeNeT Group IIT-M 48/29/2015 Broadband Defined ITU-T: 1.5 Mb/s TRAI: 256 kb/s Subscriber: Good experience with common services -- multi-media browsing, downloads, streaming media, VOIP, multi-player games Requires 256 kb/s - 1 Mb/s

TeNeT Group IIT-M 58/29/2015 Broadband Technologies ADSL over copper Metro-Ethernet Cable Internet Wireless: urban or rural –GSM –CDMA –DECT –WiMAX

TeNeT Group IIT-M 68/29/2015 ADSL Aggregatio n N/w AAA Server Core N/w BRAS Aggr Switch ADSL Access Network DSLAM/ Dedicated Shared Downstream 8-24 Mb/s, upstream Mb/s max Bandwidth guaranteed only to DSLAM, thereafter depends on how operator configures the switches/BRAS/routers Good for incumbent with many wired subscribers

TeNeT Group IIT-M 78/29/2015 Metro Ethernet Gb/s fibre access with 100 Mb/s CAT-6 in the building Easy provisioning of bandwidth B1 ISP B2 C Ethernet Access D1 D2 Ethernet UNI Metro Switch Metro Core Network Metro Access Network Customer Edge (Switch/Router)

TeNeT Group IIT-M 88/29/2015 Cable Internet Downstream 40 Mb/s shared, upstream 384 kb/s Requires good quality cable infrastructure

TeNeT Group IIT-M 98/29/2015 … Cable Internet in India 60,000 CATV operators serving 60m homes $2-3/month Cable connection quality good for TV, not good enough for upstream digital  Triple-play products from Midas provide 40 Mb/s downstream on poor quality coaxial plant: CITIUS: upstream on wireless corDECT – PC + TV CATIUS: upstream on Ethernet – PC + TV

TeNeT Group IIT-M 108/29/2015 Wireless GSM: –GPRS: kb/s –EDGE: upto kb/s –HSDPA: Theoretical downlink 14.4 Mb/s Deployed: 7.2 Mb/s Uplink 384 kb/s CDMA: –CDMA 1x: 144 kb/s –CDMA 3x: downlink Mb/s, uplink 154 kb/s-1.8 Mb/s downlink minimum 38.4 kb/s

TeNeT Group IIT-M 118/29/2015 … Wireless DECT: –Broadband corDECT (Midas): kb/s dedicated per subscriber WiMAX: –70 Mb/s shared downlink over short distances, 10 Mb/s over 10 kms 2 Mb/s over long distances

TeNeT Group IIT-M 128/29/2015 Test Methodology Uses multiple tools (BW monitor, ping, tracert) Tests 5 parameters Tests three servers (ISP, National, International) Repeated at different times of the day Repeated at weekdays and weekends Tests for long intervals to minimize effects of short term variations (eg. 100 pings, 100 sec download) Variations studied and outliers removed

TeNeT Group IIT-M 138/29/ xxx Internet User SLT Singtel (Singapore) Network Solutions (USA) Yahoo xxx xxx xxx National Server (eg Dialog) xxx Network Diagram of a Test Last mile

TeNeT Group IIT-M 148/29/2015 Broadband QoS Metrics Download throughput Upload throughput Round-trip delay (RTT) Delay jitter -- average variation in delay Packet loss Availability of service

TeNeT Group IIT-M 158/29/2015 Relevance of Metrics ThroughputDelay ServiceDownUpRTTJitterLoss Browse (text) Browse (media) Download file Transactions Streaming media VOIP Games highly relevant, ++ very relevant, + relevant, - not relevant

TeNeT Group IIT-M 168/29/2015 Jitter and Round Trip Time RTT: Time taken for a packet to reach a the destination and return. Jitter: Variation in RTT M = Average RTT; n=sample size = 100; r k = k th RTT reading Measured by pinging 100 packets to destination

TeNeT Group IIT-M 178/29/2015 Packet Loss and Availability Packet Loss = Number of packets (in %) which do not reach the destination (measured by pinging) Availability = 1 – Prob[Service unavailable for >30 sec]

TeNeT Group IIT-M 188/29/2015 Download/upload speeds: Measured using BWMonitor while downloading ~ 5 MB file (100 secs) Test tools

TeNeT Group IIT-M 198/29/2015 Test tools: ping/tracert

TeNeT Group IIT-M 208/29/2015 Test Timings 08:00 hrs: Lean period 11:30 hrs: Peak Business hours 15:00 hrs: Peak business hours 18:00 hrs: Shift from business to residential usage 20:30 hrs: Early residential users 22:30 hrs: Late residential users

TeNeT Group IIT-M 218/29/2015 Conclusions Several broadband technologies –Wired -- urban –Wireless -- urban and rural Tremendous potential for growth –Cost of service and QoS are key Six objective measures for QoS Test methodology to minimize bias and error

TeNeT Group IIT-M 228/29/2015 Links TeNeT Group -- Broadband corDECT, Cable Internet -- Articles on the various broadband technologies -- Broadband QoS study -- projects/2241/