Central Controlled IPRAN draft-khy-rtgwg-central-controlled-ipran-00.txt

1. 88th IETF @ Vancouver Central Controlled IPRANdraft-khy-rtgwg-central-controlled-ipran-00.txt Katherine Zhao(Katherine.Zhao@huawei.com) GuangMing Yong (yanggm@gsta.com) JiehuiHu (hujiehui@huawei.com)

2. Introduction • IP RAN (Radio Access Network) is a run solution using IP technology to provide network services between UE devices and mobile core network. • IP RAN has been widely used to provide varies access modes with high scalability and flexibility, it reduced network construction cost and protects codes of investments. • However the existing IP RAN implementation needs to be improved due to • Manual configuration Point-by-Point • Complex network construct and service deployment • Low troubleshooting efficiency • Central Controlled IP RAN (SDN enabled) can further improve the IP RAN and resolve these problems

3. Central Controlled IP RAN Use Case Applied in China Telecom’s Access and Aggregation Network Central Controller TDM E1 LTE/WiMax IMA E1 UMTS HSPA Controller ML-PPP E1 UMTS R99/R4 Control Agent STM-1 CSG BSC FE GSM/GPRS RSG AGG Main GE STM-1 Enterprise Control Agent CSG ATM RNC Control Agent GE Backup AGG RSG IP RNC/S-GW/MME CSG RNC/SGW/MME Control Agent Control Agent Control Agent Control Agent LAST MILE AGGREGATION ACCESS Control Agent Control Agent

4. CC IP RAN Network Architecture • ASG: Aggregation Service Gateway • BS: Base Station • CSG: Cell Site Gateway • RSG: Radio Service Gateway Third Party App NMG Controller Conversional IP RAN Network Base Routing Base Routing Base Routing Base Routing Base Routing Base Routing Control Agent Control Agent Control Agent Control Agent Control Agent Control Agent BS1 ASG CSG RSG Forwarding Node 1 Forwarding Node 2 Forwarding Node 3 Forwarding Node 6 • Major Control functions are moved to controller from network devices • Controller has E2E control capability • Access, Aggregation and RSG are forwarding devices. • Programmability of controller • Open to third party applications Forwarding Node 4 Forwarding Node 5 BS1 RNC/SGW/MME/BSC BS1 CSG RNC/SGW/MME/BSC BS2 CSG ASG RSG BS2 SDNDomain TDM/ATM/Ethernet MPLS TDM/ATM/Ethernet TDM/ATM/Ethernet MPLS TDM/ATM/Ethernet Central Controlled IP RAN Network

5. System Architecture MPLS en-caped packet L2 Label Label Payload Access Node 1 MPLS internal network Without LDP HOST ASR 9K (single chassis OR cluster) CP-DP Controller • Functions of Forwarding Node • IP/ MPLSforwarding • CP-DP protocol features • Control Agent • Light IGP for connectivity Access Node n Low Cost Device Open Architecture • Functions of Controller • CP-DP control protocol features • Network resource management features • Network virtualization features • Network protocol layer, IGP,LDP/RSVP • Network service layer,L2 (VPWS/VPLS) VPN, L3 VPN • Fault, Alarm, NB-API

6. Controller Deployment Options Built-in Mode: Controller on Device SDN Controller I3 BS1 SDN Controller I1 I2 I4 ASG1 Base Routing Base Routing Base Routing SDN Controller Base Routing Base Routing Base Routing Base Routing Base Routing Base Routing Base Routing Control Agent Control Agent Control Agent Control Agent Control Agent Control Agent Control Agent Control Agent Control Agent Control Agent I5 BS1 I1 CSG1 ASG2 ASG1 RSG1 RSG2 CSG1 RSG1 CSG1 ASG2 RSG2 CSG1 I2 I2 RNC/SGW/MME/BSC I2 I6 I3 I5 I5 RNC/SGW/MME/BSC I2 I2 I2 BS3 I1 I4 I2 I5 BS3 SDNDomain I1 I2 I2 SDNDomain Stand-along Mode: Controller on Server

7. Central Controlled IP RAN Overview Mobile Backhaul Central Controlled IP RAN Main RNC/SGW/MME RNC/SGW/MME Aggregation Aggregation Last Mile Last Mile Access Access CSG CSG Central Controller STM-1 STM-1 RSG RSG BSC BSC AGG BTS BTS AGG E1 E1 Control Plane Backup STM-1 STM-1 CSG CSG ATM ATM Control Plane ATM RNC ATM RNC NodeB NodeB GE GE Eth Eth AGG AGG RSG RSG Control Plane CSG CSG IP RNC/S-GW/MME IP RNC/S-GW/MME Control Agent NodeB / eNB NodeB / eNB • Simple O&M Control Agent • Free Service Planning, Plug and Play • Automaticprotocols deployment and fast services launch • Fast trouble shooting Manual configuration point-by-point Control Agent

8. Free Service Planning, Plug and Play Mobile Backhaul： Complex services planning AGG AGG Planning CSG&AGG ring relations Planning CSG&AGG ring relations Planning IPAddress Planning IPAddress SDN-based Mobile Backhaul：Free Services Planning CSG CSG CSG Dividing IGP Area Dividing IGP Area Saving Central Controller Main Backup Plug and Play，Zero Touch for Basic Network Solution Protocol Control Agent Control Agent Control Agent

9. Automatic Protocols Deployment and Fast Services Launch Central Controlled IP RAN Mobile Backhaul Main RNC/SGW/MME Aggregation Access Last Mile RNC/SGW/MME Aggregation Last Mile Access Virtual-cluster enable Configure remote-interface IGP/LDP/RSVP L2VPN CSG CSG Central Controller IGP/LDP/RSVP L2VPN STM-1 STM-1 RSG RSG BSC BSC AGG BTS BTS AGG E1 E1 Control Plane Backup STM-1 STM-1 CSG CSG ATM ATM Control Plane ATM RNC NodeB ATM RNC GE NodeB GE Eth AGG Eth RSG Control Plane AGG RSG IGP/LDP/RSVP IGP/LDP/RSVP CSG IP RNC/S-GW/MME Control Agent NodeB / eNB CSG IP RNC/S-GW/MME IGP/LDP/RSVP NodeB / eNB Protocol-based point-by-point services launch Service-based end-to-end services launch Control Agent Control Agent Lowers skill requirements of staff Simple protocol Automatic configuration Improves efficiency of services launch

10. Fast Trouble shooting SDN-based Mobile Backhaul Mobile Backhaul Aggregation Access RNC/SGW/MME Last Mile Main RNC/SGW/MME Aggregation Last Mile Access Trouble shooting on each node Each node sends alarm independently Alarm analysis for Locating root causes of fault Trouble shooting only on Central Controller NMS NMS CSG CSG Central Controller STM-1 STM-1 RSG BSC RSG BSC BTS AGG AGG BTS E1 Control Plane E1 Backup STM-1 STM-1 CSG CSG ATM ATM Control Plane ATM RNC ATM RNC NodeB NodeB GE GE Eth Eth Control Plane AGG RSG AGG RSG CSG IP RNC/S-GW/MME CSG IP RNC/S-GW/MME NodeB/eNB Control Agent NodeB/eNB failure failure Control Agent Control Agent