xran and C-RAN Integration in M-CORD

Transcription

1 xran and C-RAN Integration in M-CORD Dr. Sassan Ahmadi Director of 5G Wireless Systems and Standards Xilinx Inc. November 8, 2017

2 Outline Cloud RAN Integration in M-CORD 4G to 5G Technology Evolution 3GPP NG-RAN High-Level Architectures Flexible Functional Split in New Base Station () Architectures E2E Network Slicing Overall View of the C-RAN Fronthaul/Backhaul Summary and Remarks Appendix Xilinx NGFI Gateway and Functional Offload Solution for M-CORD 2

3 4G to 5G Technology Evolution Source: NMC Consulting Group Page 3

4 3GPP NG-RAN High-Level Architectures (SA vs. NSA) 5GC 5G Core Network NG-C NG-U NG Control Plane NG User Plane Network Deployment Option 2 (Standalone New Radio and Next Generation Core) EPC EPC LTE Core Network S1-C S1-U S1-C S1-U S1-U LTE Control Plane LTE enb LTE enb LTE User Plane Network Deployment Option 3/3a (Non-Standalone New Radio and LTE-Assisted) 5GC 5GC NG-C NG-U NG-C NG-U NG-U elte enb elte enb Network Deployment Option 7/7a (Non-Standalone New Radio and LTE-Assisted) Source: 3GPP TR Page 4

5 LTE-NR Dual Connectivity NR supports Dual Connectivity (DC) operation whereby a UE in RRC-CONNECTED is configured to utilize radio resources provided by two distinct schedulers, located in two s connected via a non-ideal backhaul. A may either act as an M or as an S. In DC, a UE is connected to one M and one S MCG Bearer MCG Split Bearer SDAP: Service Data Adaptation Protocol M: Master (terminates NG-C) S: Secondary (terminates NG-U) SCG Split Bearer SCG Bearer SDAP SDAP SDAP SDAP PDCP PDCP Xn Xn PDCP PDCP M S M S Source: 3GPP TR Page 5

6 Flexible Functional Split in Centralized (Cloud) Distributed To/From vepc/5gc F1 Interface To/From RRH Central Unit (CU) Distributed Unit (DU) RRC PDCP High- Low- High- Low- High- PHY Low-PHY RF Data Option 1 Option 2 Option 3 Option 4 Option 5 Option 6 Option 7 Option 8 RRC PDCP High- Low- High- Low- High- PHY Low-PHY RF Data Source: 3GPP TR Split Option 2 is a 3GPP Rel-15 WID Split Option 7 is a 3GPP Rel-15 SID

7 Prominent Cloud-RAN Architectures Facilitating Dual-Connectivity and Relaxing Handover Various Use Cases of Xilinx Fronthaul Gateway and L1 Offload Subsystem in Different C-RAN Architectures X86 or ARM-based BBU Server PDCP + RRC Higher Layers Ethernet RRU/RRH / Processor Connectivity + L1 Offload Connectivity DFE AFE + RF Centralized PDCP/RRC Architecture Increasing CoMP Gain X86 or ARM-based BBU Server L2 and above CPRI or Ethernet (TSN) RRU/RRH Connectivity + L1 Offload DFE Connectivity + L1* Offload Centralized L2/L3 Architecture AFE + RF Preserving Legacy RRUs X86 or ARM-based BBU Server L2 and above Connectivity + L1 Offload Ethernet (TSN) RAU Connectivity + L1* Offload CPRI RRU/RRH DFE AFE + RF Centralized L2/L3 Architecture with Aggregator Node Page 7

8 New Base Station () Architectures Separation of User-plane and Data-Plane Separation of Central Unit and Digital Unit E1 Source: 3GPP TS New Interfaces Page 8

9 NG-RAN Network Architecture Access and Mobility Management Function (AMF) User Plane Function (UPF) AMF/UPF AMF/UPF 5GC AMF NAS Security Idle State Mobility Handling UPF Mobility Anchoring NG-RAN PDU Handling Source: 3GPP TS Page 9

10 E2E Network Slicing MPLS: Multiprotocol Label Switching SW: Switch DC G/W: Data Center Gateway Source: NMC Consulting Group 10

11 Overall View of the C-RAN Fronthaul/Backhaul NGFI-I NGFI-II Backhaul RRH DU CU EPC NGC Transport connection (server layer) FTN 1 FTN x FTN x1 FTN y BTN y1 BTN z RRH DU CU PHY PHY PDCP RRC Data FTN 1 FTN x FTN x1 FTN y BTN y1 BTN z Native CPRI [CPRI] [ETH] [ETH] Native RoE/eCPRI [ETH] NGFI-II: Sub-class 2 [1 ms] BH: Sub-class 3 [10 ms] NGFI-I: Sub-class 1 [100 µs] BS/eNB/ blocks CPRI aggregation blocks Source: IEEE 1914 NGFI (xhaul) 11 ETH aggregation blocks [...] Radio protocol carried Transport connection (Lx-server layer, x=0, 1, 2)

12 Summary and Remarks Cloud RAN Integration in M-CORD necessitates alignment with 5G requirements, which means M-CORD platform must support prominent functional splits M-CORD platform must support various fronthaul options M-CORD platform must support RAN virtualization and SDN control M-CORD platform must support RAN slicing 12

13 Appendix: Xilinx NGFI Gateway and Functional Offload Solution for M-CORD 13

14 Cloud-RAN Fronthaul Gateway vbbu (Emulated) vbbu Fronthaul Gateway RRH Gateway RRH (Emulated) Xilinx FPGA-based Implementation of NGFI Gateway and L1 Offload SDN-based configurable fronthaul gateway to support fast connectivity Ethernet up to 100 Gbps Ethernet with TSN up to 25 Gbps for RoE Multiple CPRI links up to 25 Gbps (ecpri support is planned) Support of flexible functional splits Page 14

15 Xilinx Cloud-RAN Fronthaul Gateway FEATURE AVAILABILITY TARGET BOARD VCU108 STRUCTURE AGNOSTIC MAPPER STRUCTURE AWARE MAPPER NATIVE ROE TOD SUPPORT BY ROE STRUCTURE AGNOSTIC MODE TOD SUPPORT BY ROE STRUCTURE AWARE MODE TOD SUPPORT BY NATIVE ROE MODE SUPPORT FOR SYNCE FREEDOM TO CHOOSE MASTER/SLAVE MODE AT ANY POINT MIXED IEEE1588 BUILT-IN IEEE1588 PRECISION 2.5 NS NUMBER OF CPRI PORTS 10 MAX. CPRI LINE RATE 25G COMPRESSION OPTIONAL L1 OFFLOAD 3GPP OPTION 7-X DOWNLINK 100 MHZ L1 OFFLOAD 3GPP OPTION 7-X UPLINK 100 MHZ DOWNLINK DATA GENERATION OPTION AT BBU UPLINK SIGNAL ANALYSIS OPTION AT BBU RS-FEC PCS 1-25G PCS 40G PCS 50G PCS 100G TSN 10G TSN 25G BACKGROUND TRAFFIC FEATURE AVAILABLE RF TRANSCEIVER SUPPORTED JESD204B TRANSCEIVER INTERFACE SUPPORT 10G ETHERNET SUPPORT 25G ETHERNET SUPPORT 40G ETHERNET SUPPORT 50G ETHERNET SUPPORT 100G ETHERNET SUPPORT CLI GUI OPTION ADRV9371 Page 15 Xilinx Virtex UltraScale FPGA VCU108 Board