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Synchronization Requirements for RAN & Backhaul Update

Synchronization Requirements for RAN & Backhaul Update. draft-zhou-tictoc-ran-sync-req-01.txt Xiaodong Duan, Lan Wang China Mobile. Version Update. New version submits draft-zhou-tictoc-ran-sync-req-01.txt Update Phase sync accuracy of RAN system in TD-SCDMA reaches agreement

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Synchronization Requirements for RAN & Backhaul Update

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  1. Synchronization Requirements for RAN & Backhaul Update draft-zhou-tictoc-ran-sync-req-01.txt Xiaodong Duan, Lan Wang China Mobile

  2. Version Update • New version submits • draft-zhou-tictoc-ran-sync-req-01.txt • Update • Phase sync accuracy of RAN system in TD-SCDMA reaches agreement • Accuracy among NodeBs: 3us • Accuracy between NodeB and reference clock: 1.5us • Phase sync accuracy of RAN system in TD-LTE is under discussion • Accuracy among NodeBs: 1~3us • Requirements for 1588v2 backhaul

  3. Base station Base station controller Ref. Clock UE UE RadioInterfaceSYNC Node SYNC Network SYNC Base station Requirements Update

  4. Urgent requirements for RAN Sync • Most operators have choice LTE as their evolution of 2/3G network • TDD based LTE has just been introduced • TDD LTE has higher sync requirement than FDD • The requirements for RAN is clear and urgent • Radio Access Network is on the early stage of moving to IP transport • GPS is the only solution so far • The total technologies/solutions should be deployed within one year----Urgent!! • TICTOC should accelerate its work

  5. ATM NodeB SDH RNC ATM NodeB Example:Current 3G/TD-SCDMA Networks • Currently, each nodeB has a GPS antenna--Not so good! • COST: you can imagine 10000 BSs in one city • Uneasy deployment: affect the flexible deployment of BS • Other • Security/Reliability

  6. Access Aggr Core RNC RNC 802.1ad IP/MPLScore PBT NodeB NodeB NodeB NodeB NodeB NodeB NodeB PON DLS RNC RNC TMPLS IP/MPLScore TMPLS TMPLS RNC RNC MPLS Access IP/MPLScore MPLS AGG VLL/VPLS 802.1ad Mobile backhaul 802.1ad/ PON / MPLS PBT/ TMPLS/ MPLS/ VPLS/ IP IP/MPLS Core

  7. Backhual sync transmission • Two sync transmission mode should be considered • Core network sync distribute—sync are distributed to local clock • 1588v2 over IP/MPLS core • Core to edge- local clock are distributed to Edge Node (such as BS) • IEEE1588 or other must be extend to used within different backhaul technology, such as • MPLS/IP • PON • 802.1 • PBT • TMPLS • The protocols designed by TICTOC should considered • Reliable transmission • Security • Retransmission/Verification • Suit for different kinds of backhaul • How to Work with Multicast Technologies to reduce overhead

  8. Summary • RAN requirements for sync are more clearly now and TD based LTE has high sync requirements • It better for us to provide solutions with 1years, so that the industry can used it ASAP • Most operators are replanning their Mobile Backhaul to meet the high bandwidth, the sync protocol should be considered • Telecom profiles of sync protocol • network scale/ network load/ local clock accuracy • Reliable transport/ security/ efficiency/ Retransmission/Verification • Multicast

  9. Thank you&Any questions?

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