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Rethinking the mobile backhaul offering
 

Rethinking the mobile backhaul offering

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Valéry Augais's presentation on rethinking Colt's mobile backhaul offering.

Valéry Augais's presentation on rethinking Colt's mobile backhaul offering.

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    Rethinking the mobile backhaul offering Rethinking the mobile backhaul offering Presentation Transcript

    • © 2012 Colt Telecom Group Limited. All rights reserved.Rethinking mobile backhaul offering for afixed operator like ColtValéry AugaisStrategy and Architecture
    • 2Contents1Moving from the traditional «transparent» to a managedservices approach2Off-loading MNO’s RAN with small cells: implicationsfor the fixed operator3Reviewing the key service and technical attributesthat will forge the design: L2/L3, X2, security,synchronisation and C-RAN
    • 3Colt – Europe’s information delivery platform• 43,000km EU high capacity long distancenetwork, 27,000km transatlantic• Connecting 22 countries, 39 metronetworks and >150 cities• 20 data centres and 19,000 connectedbuildings
    • 4From the traditional «transparent» offer…Various successful 3G backhaul trials and deployments• Ethernet Virtual Private Line over fibre and copper (EFM DSL) access– Multiple point to point EVCs, single multiplexed Ethernet UNI• No hop-by-hop timing (SyncE/BC/TC) but OTT 1588 and on-site GPS– High jitter performance in the backhaulmobile coreL2 CPEbackhaul MNO mobile coreMNO cell sitesNBL2 edgeL2 access &aggregationRNC1588 GM1588 slaveGPS
    • 5to managed services• Fast pace evolving radio access technologies (esp. LTE-A as of 3GPP R10)– Improved latency (CoMP)– More accurate time synchronisation (MIMO, CoMP, TD-LTE, eMBMS)– Small cells• Resulting likely new and more stringent MNO requirements in areas such as– Latency (esp. inter-eNB)– Synchronisation (time, accuracy level)– Heterogeneous Networks (e.g. macro vs. metro/small cells)– But also connectivity model, security, Cloud RAN, etc.Managed solution approach to fulfill theanticipated diversity of MNOs’ requirements
    • 6The small cell caseOur understanding why it matters MNO operators• Bandwidth explosion with video & data consumption and smartphone adoption• Insufficient capacity of 3G RAN networks organised in macro cells to support LTEand LTE-A– Need for complementary support of 3G cellular and Wi-Fi• Utmost importance of traffic offload at cell spectrum level– Frequency band re-farming on its way but long and incomplete process– Femto cell (indoor) similarly good but incomplete• Other rather secondary benefits with cell backhaul offload and coverageextension«By 2015 small cells forecast to represent more than 80% of deployed cell»«97.5% of MNOs viewing small cells key for the future of mobile networks»
    • 7The neutral host approachColt’s small cell strategy in a nutshell• MNOs’ needs to build new backhaul for these many brand new cells• Colt’s unique presence in Europe with dense fibre capillarity within 39 maincities• Colt as a leading and trusted transactional business supplier to fixed andmobile operators• Well established contacts between Colt and city councils & street furnitureownersMulti-MNO neutral host small cell offer comprising:• site access (power included) through partnerships• backhaul connectivity (in-house)
    • 8Small cell connectivity optionsAnother important piece of the puzzle to solve• Fibre as the preferred medium when available– Colt own fibre plant not passing nearby– No FTTx wholesale offer• Copper DSL as the next wireline candidate but– Shortfall of bandwidth with currently allowed EFM options (5.7Mbps/pair)– Highly fragmented regulations in EU for enhanced DSL modulations (EFM, VDSL2,vectoring)• Wireless showing more and more potentials with rapid turn-up and high capacity(e.g. unlicensed V band) but– LoS condition and small cell in urban environment apparently somewhat contradictory– Questionable radio reliability and bandwidth performance in NLoS conditionAlong with power supply, connectivity build likely represents anotherchallenge to overcome and is likely to make use of multiple mediaPoEMNO #1MNO #2Colt backhaulpowerfibre
    • 9Backhaul service attributes• Multiple attributes leading to diverse requirements hence different backhauldesign variants• Interestingly some objectives, if really required, likely to trigger a completerevisit of backhaul design and MNO operating modelAttribute RemarkL2 or L3 connectivity Each has its supportersFast X2 interface For CoMP supportSecurity IPSec_as_a_service not high in the list thoughSynchronisation Fixed operator participation with on-pathCloud RAN To help with signalling/BW storm and fast X2
    • 10Network layer 2-3 integrationIn-flight multi-work stream programme• Ethernet, IP and optical layers• CPE, edge and core areasL2 access &aggregationL2 serviceL2 serviceL2 CPEL2 CPEL2/L3 packet optical coreL2/L3 edgeL3 serviceL3 features moving to the PE layerIP services over Ethernet access (metro)Ethernet services (metro & inter-metro)
    • 11E-Line for S1E-LAN (w/ L2 CPE) for X2High level reference connectivity modelEvolved Packet CoreL2 CPEbackhaul MNO mobile coreMNO cell sitessmall cell/eNBL2 access &aggregationS-GW / MMEL2/L3 edge
    • 12E-Line for S1L3 VPN (w/ L2 CPE) for X2High level reference connectivity modelEvolved Packet CoreL2 CPEbackhaul MNO mobile coreMNO cell sitessmall cell/eNBL2 access &aggregationS-GW / MMEL2/L3 edge
    • 13Transitioning to fast X2• High pressure on backhaul performance with emerging LTE-A’s X2requirement (CoMP in 3GPP release 11)– Very short maximum inter-eNB delay (5ms, 1ms or other) as the next 3GPP standardrequirement to support seamless HO• Fast X2 presumably in scope of HO between macro and small cells– Small cell to small cell less likely to happen before long• Lower field performance of 10ms, 15ms or even more possibly acceptable forMNOs despite impact on radio spectrum efficiency gain• X2 marginally deployed today with base LTE but expected to increase withmore users in mobilityCentralised edge architectures uncertain to meet fast X2 objectivesChange to distributed edge to increase backhaul & mobile operators’ costs
    • 14Adding securityEvolved Packet CoreL2 CPEbackhaul MNO mobile coreMNO cell sitessmall cell/eNBL2 access &aggregationS-GW / MMEL2/L3 edgeIPSec GWE-Line for S1E-LAN (w/ L2 CPE) for X2IPSec tunnel initiation
    • 15Adding securityEvolved Packet CoreL2 CPEbackhaul MNO mobile coreMNO cell sitessmall cell/eNBL2 access &aggregationS-GW / MMEL2/L3 edgeIPSec GWE-Line for S1E-LAN (w/ L2 CPE) for X2IPSec tunnel initiationUnbalanced security with secure S1 but unsecure X2?Hybrid operation with complex management of key exchange certificate?IPSec tunnel initiation on L2 CPE?
    • 16Synchronisation requirement• Will accurate time (needed for CoMP, etc.) turn real at some point?• Will transparent backhaul continue to do the job?• Will MNOs accept backhaul operators’ PRC clock synchronise the backhaul?L2 CPEsmall cell/eNBL2 access &aggregation1588 GM1588 slaveGPS L2/L3 edgeS-GWMMEEvolved Packet Corebackhaul MNO mobile coreMNO cell sites
    • 17Synchronisation requirement• Will accurate time (needed for CoMP, etc.) turn real at some point?• Will transparent backhaul continue to do the job?• Will MNOs accept backhaul operators’ PRC clock synchronise the backhaul?L2 CPEsmall cell/eNBL2 access &aggregation1588 GM1588 slaveGPS L2/L3 edgeS-GWMMEEvolved Packet Corebackhaul MNO mobile coreMNO cell sitesOn-path synchronisation delivery with IEEE 1588v2 BC/TC supportNo absolute need for physical layer synchronisation support, i.e. SyncEMulti-clock capable devices if no PRC clock outsourcing
    • 18Cloud RAN evolution• C-RAN development motivated for multiple reasons– Opex & capex cost reduction (small cell), signalling & BW storm and fast X2 (CoMP)• Stringent requirements with current approach based on CPRI interface long-lining– Multi-Gbps bandwidth and 0.1ms latencyEPCL2 CPEpacket backhaulMNO super macrocell sites (BBU pools)super eNBL2 access &aggregationL2/L3 edgeS-GWMMEsmall cell/eNBfibre andL1 EthernetCPRI backhaulMNO cell sites MNOmobile core
    • 19Cloud RAN evolution• C-RAN development motivated for multiple reasons– Opex & capex cost reduction (small cell), signalling & BW storm and fast X2 (CoMP)• Stringent requirements with current approach based on CPRI interface long-lining– Multi-Gbps bandwidth and 0.1ms latencyEPCL2 CPEpacket backhaulMNO super macrocell sites (BBU pools)super eNBL2 access &aggregationL2/L3 edgeS-GWMMEsmall cell/eNBfibre andL1 EthernetCPRI backhaulMNO cell sites MNOmobile coreAlternative approach of long-lining L1-L2 radiointerface far more appealing for backhaul operators:• Packet backhaul• Lower bandwidth• Longer latency• Centralised hosting in data centres
    • 20Summary• 3GPP R10 being introduced now in some parts of the world (e.g. NA)– 2-3 more years likely to go to see R11 live and with the highly demanding CoMPin operation (especially in the lagging EU)– Roll out of pre-CoMP small cells anticipated to happen before in ca. 2014• No one size backhaul fits all but many multi-degree variants instead– Radio access technologies (3G/LTE/LTE-A cellular, Wi-Fi)– Backhaul medium (fixed, wireless)– Other key attributes (L2/L3, latency, security, synchronisation)High focus on backhaul and small cell business at ColtPresently at business development and partnership stageDetailed design and engineering level discussions to start
    • © 2012 Colt Telecom Group Limited. All rights reserved.Thank you. Questions?valery.augais@colt.netwww.colt.net