intelligent Converged Network consolidating Radio and optical access arounduser equipment Converged ernet for Next- Generation x-haul Daniel Muench (EuCNCWorkshop Towards Converged X-Haul for 5G Networks A joint workshop of the icirrus, 5G-XHaul and 5G-Crosshaul projects) 27.06.2016 This project has received funding from the European Union s Horizon 2020 research and innovation programme under grant agreement No 644526 (icirrus)
Motivation ernet as Convergence Layer for Next-Generation x-haul Applying ernet allows: Multiple topologies ernet-based OAM (Operation Administration and Maintenance) Aggregation and different treatment of multiple traffic classes Being agnostic to any functional split
Topology:Point-to-point -> -Aggregator CPRI CPRIo -Aggregator (-Switch with support for TSN) BBU= Base Band processing Unit CPRI= Common Public Radio Interface = ernet = Radio Remote Head TSN= Time-Sensitive Networking Point-to-point -Aggregator (-Switch with support for TSN) CPRIo Next-Generation Central Office
Topology: Tree topology -> addanddropofcells CellB CPRI CPRIo Next-Generation Central Office -Aggregator -Aggregator CPRIo CellA -Aggregator CPRIo BBU= Base Band processing Unit CPRI= Common Public Radio Interface = ernet = Radio Remote Head TSN= Time-Sensitive Networking
Topology: Ring topology ->Redundancy CellB CPRI CPRIo CPRIo -Aggregator -Aggregator Next-Generation Central Office BBU= Base Band processing Unit CPRI= Common Public Radio Interface = ernet = Radio Remote Head TSN= Time-Sensitive Networking
ernet-based OAM (Operation Administration and Maintenance) OAM for Service Level Agreement (SLA) and Self-Optimizing Networks (SON) CPRI CPRIo Internal probes -Aggregator (int.) -Aggregator Pluggable Probes CPRIo (ext.) Next-Generation Central Office BBU= Base Band processing Unit CPRI= Common Public Radio Interface = ernet = Radio Remote Head TSN= Time-Sensitive Networking
Aggregation and different treatment of multiple traffic classes Aggregation and different treatment of multiple traffic classes supported by IEEE 802.1 time-sensitive networking(tsn) Timing and sync data User data Control data Other data Filtering/ Policing Transmission selection/ Shaping/ Scheduling
Agnostic to any split point Agnostic to any split point(also different split points for UL and DL possible) MAC split Upper Phy split Lower Phy split Centralized split (stateoftheart) QAM MAC FEC IFFT + CP DAC IF/RF map Downlink (DL) MAC split Upper Phy split Lower Phy split Centralized split (stateoftheart) QAM MAC FEC FFT -CP ADC IF/RF demap Uplink (UL)
(Preliminary) Requirements (Preliminary) Requirements (condensed from icirrus D2.1, D3.1 and D3.2) Data rate (trunk line) Max. Latency (round trip) Max. Latency imbalance Min. frequency accuracy Min. phase and timing accuracy (CPRI) 100Gb/s to 400Gb/s 150us (CoMP) 440us (no CoMP) Modified split (no CoMP) 100Gb/s to 400Gb/s 440us Modified split (CoMP) 100Gb/s to 400Gb/s 150us +/-16ns +/-163ns +/-163ns +/-2ppb +/-2ppb +/-2ppb +/-10ns (MIMO, TX- Diversity) +/-1.36 µs (LTE TDD) +/-30ns +/-30ns Max. BER 10-12 10-12 10-12
Standard activities IEEE 802.1CM Mobile fronthaul IEEE 1904.3 Radio over ernet encapsulation IEEE 1914 Next Generation Fronthaul Interface
Standard activities IEEE 802.1CM Mobile fronthaul IEE802.1CM = Mobile fronthaulprofileforieee 802.1 time-sensitive networking mechnanisms Status Draft 0.3: considers IEEE 802.1Q (VLAN Bridge specification) considers IEEE 1588 Synchronization considers frame preemtion(e.g. IEEE 802.1Qbu, IEEE 802.3br) considers applying IEEE 802.1CB Seamless Redundancy RequirementsarecurrentlyunderdiscussiontogetherwiththeCPRI community
Standard activities IEEE 1904.3 Radio over ernet encapsulation Scope: Encapsulation and mapping of radio protocols to be fronthauledover ernet networks Achieving QoS is not focused (->IEEE 802.1CM) Purpose: exact header formats and packet encapsulations Status from D1.0 (28 May 2016) 3 Types: simple tunneling mapper (encapsulating all), structure agnostic mapper (encapsulating after removing encoding (8/10, 64/66)), structure aware mapper (actual mapping)
Nodraftavailableyet/ just started Standard activities IEEE 1914 Next Generation Fronthaul Interface
Conclusion 5G challenges the current fronthaul model fronthaul/backhaul boundary in 5G is blurred ->opens an opportunity for an open x-haul solution based on ernet Meeting the timing and latency constraints for next-generation fronthaul will require a strict control of timing and synchronization hot research item in icirrusand a study item in standardization icirruswill deliver a prototype network for performance measurements with different mobile solutions (OAI, 60GHz, legacy CPRI)
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