China Mobile s View on Next Generation Fronthaul Interface
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1 China Mobile s View on Next Generation Fronthaul Interface
2 2 Challenges for future 5G networks Agility, openness, scalability, efficiency GSM/GPRS/ EDGE WiMax/WLAN TD- SCDMA TD- LTE So many issues for current hard mobile networks ü Time-to-market ü Service innovation ü Energy efficiency ü TCO ü Interoperability ü
3 Special Challenge for CMCC How to coordinate our four networks to satisfy user needs? 81x from 2008 to 2012 p 0.9Million BTS p 0.5Million BTS GSM/GPRS/EDGE TD- SCDMA WLAN TD- LTE p 4.41 Million AP p 0.61M BTS by p 80M users by The answer: Green and So7 3
4 C- RAN: the revolu=onary evolu=on towards 5G, proposed by CMCC in So7 BS in C- RAN virtualiza=on/cloudiza=on Real- Pme Cloud for centralized processing High bandwidth oppcal transport network Distributed Virtual BS Pool CentralizedControl and/orprocessing Centralized processing resource pool that can support 10~1000 cells Collaborative Radio Multi-cell Joint scheduling and processing Real-Time Cloud Target toopenitplatform Consolidatetheprocessing resourceintoacloud Flexiblemulti-standard operationandmigration Clean System Target Lesspowerconsuming LowerOPEX Fastsystemroll-out
5 5 Fronthaul is a major challenge for C-RAN deployment CPRI req. per site BBU pool Challengebyfronthaulb/wBBUand Datarateb/wBBUandusingCPRIis ashighas9.83gbpsfor8-antennatd- LTE,requiring4fibersforeachcarrier with6gsfp Typical configura=on # of carriers CPRI data rate per carrier Total CPRI data rate before compression GSM 3, S6/6/ Mbps 1.44Gbps TD- S 3, S3/3/ Mbps 2.7Gbps Current TD- LTE 3, S1/1/1 3 10Gbps 30Gbps Medium term TD- LTE S2/2/2 6 10Gbps 60Gbps In addi=on, CPRI has cri=cal requirements on synchroniza=on and latency. Efficient fronthaul solu=on is required to enable C- RAN large- scale deployment
6 Time to rethink FH for the sake of 5G evolu=on 2 Rethink FH 1 CPRI CPRI for 5G? Probably NOT Too high data bandwidth Scalability issue to support 5G evolu=on Lower efficiency due to TDM mode 3 Ini=al work in SDOs NGMN conducted ini=al func=on split solu=ons for LTE Newly founded project in CCSA to study the requirements, scenarios and the key technologies Discussion in ITU- T and IEEE TSN recently Traffic dependent to enjoy and enable sta=s=cal mul=plexing for FH transport networks Decoupling cell processing and UE processing Decoupling UL and DL Support key 5G technologies, e.g. LSAS, CoMP etc. A new FH requires joint design from both wireless and transport perspec=ves Func=on split b/w BBU and Careful transport network design to address the latency, jicer and in par=cular, synchroniza=on requirements More radically, could we relax the cribcal CPRI requirements (e.g ppm sync. requirement)? 6/20 6
7 Expected benefits Reduced FH bandwidth and therefore the cost Disaster- tolerant backup thanks to flexible mapping b/w BBU pool and Capacity:100%- >0 Coverage:100%- >0 Capacity: 100%- >100% Coverage:100%- >200% BeYer support for live migrapon BeYer support for 5G technologies due to the flexible roupng capability 0 N-1 1 N 0 M-1 1 M 0 K-1 1 K Shutdown Shutdown 0 L-1 1 L BBU Pool Back-haul Front-haul Front-haul Core Network(CN) Micro Access Gateway Macro UE Micro UE 7
8 Some ini=al work in this front Initial study on BBU- function split for LTE Design principle: Traffic-dependent BW adaptation Statistical multiplexing Multiple mapping relationship b/w BBU and Independent of antenna number Initial verification of the feasibility of CPRI over Ethernet Simple point to point connection CPRI I/Q sampling -> Ethernet packet of 512 Bytes 1588v2 for phase sync. R F Cell Processing CP Rem. CP Add. Comme rcial UE EPC (ZTE) F F T i F F T Resource Demapping (ALU) (ZTE) VM RT +OAI Linux + Driver CE & Eq. Resource Mapping CPRI CPRI PCIe UE Processing R x T x Frontend card Frontend card Sync & data NIC PUSCHProcessingper UE To MAC PUCCH Processing per RB PDSCH Processing PDCCH/PBCH/ PCFICH/PHICH 10GE 1PPS& 10MHz 10GE 1PPS& 10MHz 10GE 1PPS& 10MHz From MAC GPS 10G SyncE Switch 10G SyncE Switch WP on Next-generation Fronthaul Interface (NGFI) ongoing, to be published by March 8/20 NGFI forum planned for Q (contact: huangjinri@chinamobile.com) 8
9 Ini=al study on BBU- func=on split Protocol /Service GPP Accelerator Packet transmission b/w accelerator and converter Filter PA A/D D/A Converter PCIe Converter: to reduce bandwidth b/w BBU and CPRI termina=on Pre- processing Switching interface BW propor=onal to traffic load Reduce maximum data rate to 1/5, e.g. 9.8Gbps to 2.1Gbps Make it possible for packe=zed CPRI and CPRI over ethernet S=ll, other issues are under discussion BBU Packet Switching CP removal FFT RB selection Per-RB AGC Compression UL CPRIdatais Standinterface convertedtopacket dataafter Internalinterfaceinside converter sprocess PRACH CP addition ifft Decompression Switching interface (e.g. 10G Ethernet) DL 9/20 9
10 Major challenges NGRI requires joint re- design from both wireless and transport perspec=ves From wireless perspec=ve: BBU and func=on split is required A big impact on exis=ng product form Maintenance and future update are also concerns From transport perspec=ve Latency, jicer and synchroniza=on issues on Ethernet 10/20 10
11 Thank you!
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