QoS in a converged World
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- Marilynn Bell
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1 QoS in a converged World Workshop on "Management of Network Virtualisation", Brussels 6 th November 2007 Dave Wisely Head of Convergence Research BT Group CTO Dave.wisely@bt.com
2 BT s main research site - Adastral Park one of the highest concentrations of technologists in Europe. 110 acres people
3 Agenda What does convergence mean? 21C - an all-ip convergence platform Who benefits from QoS? Current solution Elegant (IMS) solution can we sell it? Wireless issues Media Independent Handover Conclusions
4 Convergence? - anywhere, anytime, anyplace Broadcast Home Small office HSDPA Out and about GSM Wimax 3G Enterprise Broadband
5 BT Home Hub Home and small office Home Next Generation Voice In/out of home and office Next Generation Voice Videophone Wireless Network PCs Next Generation TV Monitoring and Control Remote diagnostics and support Gaming 1m Home hubs distributed Q k (SME)
6 21C - A Platform for Mobility & Convergence Away from Home or Office Around the Office At Hot Spot At Home Mobile Network GSM/GPRS & 3G with Vodafone Enterprise Networks LAN & WiFi Wireless Access WiFi & WiMAX Residential Broadband Access DSL & Cable PSTN Interfaces to Vodafone Network 21C SIP/IMS Infrastructure for VoIP, Video, Messaging & Broadband Data Services Legacy Interfaces to PSTN BT 21C Network Converged Voic Converged IM/SMS/MMS
7 Who benefits from QoS? Users want services don t care how it is done if service works Will churn and complain if service fails Won t pay more for QoS specifically Service providers Want to sell services Might pay more for QoS Need to be persuaded it makes a difference! Network providers Need to move away from connectivity Want to sell network value-add QoS, location, security.. Will only invest if there is a good business case
8 Current solution - practical 1 More upstream voice than the limited US bandwidth can support. US voice and data competing for limited US bandwidth, voice get delayed High bit-rate business services overload US backhaul Inter-service interference 2 SBG2 SBG3 SBG1 HG D S L A M BRAS Service Switch Internet 3 DS voice and video delayed by in-home, transit traffic, or slow HN technology 4 DS VC saturated with data, voice gets dropped DS aggregate insufficient for video(+voice) 5
9 Not scalable to mobile Services identified by static signatures in HG EU markings ignored 1 Q per service class Mix of SP + WRR Qs (e.g. 3+3) All SP traffic gets sent No service policing Video and voice traffic marked by service platforms Interconn QoS managed on aggregates Videp Voice HG D S L A M Edge Node Service Switch Internet BRAS assures video BW per line BRAS prioritises voice over data per line CAC system limits video aggregate
10 DSL QoS some observations! Bandwidth increases with a Moore s law constant of <12months! QoS solutions are only of use for loadings of % of network capacity 3 QoS classes work as well as 6! L2 hard solutions work well for Enterprises with strict QoS requirements all you can eat tariffs are not ideal! No. Users 50MByte 5GByte
11 Longer term solution - ETSI TISPAN NGN R1 Based on 3GPP IMS IP Connectivity Access Network And related functionality Applications User Profiles Other Multimedia Components Streaming Services (RTSP based) R-MGF Network Attachment Functionality NASS Resource and Admission Control Functionality RACS PSTN / ISDN Emulation (SIP-I based) IP Multimedia Component (Core IMS) (SIP based) IBCF RACS PSTN/ISDN Other Networks RGW A-MGF T-MGF Access Node IP Access Transport Network RCEF L2TF ARF IP Edge Node C-BGF Core Border Node TGW Core transport Network I-BGF BGW
12 Physical Realisation II: Use Case Scenario SP A Enterprise VideoTelephony SP B Video Streaming Service SP C On-line Gaming A-RACF SPDF RACS ADSL Service Provider 3 6 Backhaul BRAS PEP Core Transport Nw 1. Setup videotelephony conference to team 2. Request resources for audio and video flows specifying characteristics 3. Make policy-based and resource availability-based admission decision and enforce corresponding policies in the network 4. RACS sends acknowledgement of successful reservation to Application 5. Application acknowledges successful videotelephony session to user 6. Videotelephony session starts
13 BT IPStream Advanced Services Trial Policy Management on broadband Planned trial STIN427 & STIN450* End User Speed Control Down Stream QoS Web Services Interface NP-ADQ ADQ Interface Calls: SetDefaultPolicy() ApplyPolicy() AlterPolicy() ReleasePolicy() GetLineStatus() GetUsageHistory() Service Provider BT Wholesale BRAS *Supplier Trial Information Notes Can be found
14 Mobile Network all-ip in 2015? GSM Radio Access Network BSS CS Domain PSTN /GSM CS-MGW CS-MGW TE MSC VLR GMSC RNC IMS Domain RNC HSS (HLR/ AuC) P/S/I-CSCF MGCF UMTS Terrestrial Radio Access Network (UTRAN) Signalling Gateway SGSN GGSN MRF Media Gateway Security Gateway IMS Internet PS Domain BGW Other PLMNs
15 Convergence today is mostly about WiFi Wi-Fi handsets forecast to increase nearly 1300% through to 2010* million Wi-Fi portable devices globally by 2010** 22 million in the UK alone by 2011 * Wi-Fi Alliance has already certified over 3000 products Over 142,407 free and paid Wi-Fi hotspots in 132 countries Over 300 wireless cities deployed * Infonetics Research ** Wireless Cities, BT Openzone, Wi-Fi Consumer & Business networks
16 Voice is still where QoS is most needed Skype on 3 BT Total Broadband Home environment BT Fusion Consumer and Enterprise versions)
17 What is Media Independent Handover aka Connect to WLAN Café Shutdown GSM Start Download over WLAN Network Type Wi-Fi Switch to WiMAX Download over WiMAX Shutdown WLAN Wakeup GPS SSID/ Cell ID WiMAX BSSID Wakeup WLAN WLAN Link Going Down Operator Security Wakeup WLAN Download over WLAN Shutdown GPS Battery level low Shutdown WiMAX Stop download NW Channel Wi-Fi Airport WiMAX Radio Radio State State GSM WLAN WiMAX GPS QoS Physical Layer Data Rate GSM N/A AT&T NA NA NA N/A N/A 9.6 kbps d b Airport Café NA 00:00: NA T-Mobile AIrport Café PKM.11i EAP-PEAP e Yes OFDM Mbps
18 21C Mobility Architecture Testbed Information Server cover Dynamic and Static parameters IS Dynamic Data IS Static Data Service Broker is a SIP Application Server within the IMS domain LSB CSCF MIH Handover Support Context Service Transfer Adaptive HSS BT Connection Manager is split between network and terminal 2G./3G 2G./3G WLAN WLAN WiMAX WiMAX
19 Conclusions QoS is an essential part of delivering at least video and voice services Today s solution is a hotchpotch DSL edge solutions Over provision Wireless circuits/special treatment for voice In the long term ETSI TiSPAN provides a complete architectural solution which harmonises with mobile IMS solution Research into dynamic network selection, handover and adaptation will reduce QoS requirements AGAVE/EMANICS work of great interest to BT Trilogy project ECN work
20 Rubbish Thank you any questions?
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