Challenges and Solutions for Wireless Backhaul

Transcription

1 Challenges and Solutions for Wireless Backhaul Bob Cubbage Manager, Metro Ethernet

2 LTE Backhaul Challenges Voice Dominant Traffic Cost Revenue Business Model Regional and Nationwide Coverage Service Applications End-to-End Management Page 2

3 4G Challenges 4G OPEX soaring due to: - Increase in backhaul Traffic - Increase in number of enbs, femto Cells are required To maintain profitability, cost has to properly track revenue Voice Dominant Traffic Cost Revenue Target Cost 2G/3G to 4G 2 10 Mbps x Mbps Page 3

4 Wireless Backhaul Technology Options BTS/ enb Wireless BSC/ SGW BTS/ enb Fiber BSC/ SGW BTS/ enb Copper BSC/ SGW Page 4

5 Flexible Solutions Solve 4G Backhaul Challenges T1/E1 Copper 1.5 ~ 20Mbps 2G/3G T1/E1 Multi-Media Access Copper Microwave Fiber IP Microwave ~ 800Mbps Copper Bonding 4Mbps ~ 40Mbps Ethernet Fiber 100 ~ 1000Mbps 2G/3G/4G 2G/3G/4G Microwave xdsl Ethernet DSLAM xpon Fiber 100 ~ 1000Mbps Enterprise GPON Multi-media access addresses reach & scalability issues Page 5

6 Any Media Access Provides TCO Reduction Microwave - IP microwave with adaptive modulation maximizes bandwidth - Compact co-site design saves space and cost Ethernet over fiber - Cost-effective backhaul GPON over fiber - Extend fixed broadband network xdsl over copper - Offload lower priority traffic at lower cost per bit Cell Site GPON xdsl Resident Ethernet Microwave Enterprise Fiber Copper Radio Packet Transport RNC Page 6

7 Low-Priority Offload Reduces Transport Cost Source: Allot GMBT Report 2009Q2 Small percentages of services require stringent SLAs Most bandwidth intensive applications do not require strict SLAs Existing transport can be used to provide strict SLAs Offload provides cost-effective transport for low-priority services NxT1/E1 Policy Service enode B Offload Low QoS QoS Guaranteed RNC (Radio Network Controller) Internet ISP xdsl/docsis SR (Service Router) Considerable Transport Savings via Low-priority Offload Page 7

8 LTE Network Architecture Considerations last mile middle mile RNC/AGW last mile middle mile S1 S1 RNC/AGW Switch point last mile middle mile RNC/AGW Switch point Page 8

9 Synchronization Requirements System GSM WCDMA CDMA2000 LTE FDD with SFN/MBMS or D-ICIC LTE - TDD WiMax - TDD Frequency Accuracy 0.05ppm 0.05ppm 0.05ppm 0.05ppm 0.05ppm Timing Accuracy NA NA 3us 1 to 3 us 1 to 3 us FDD: Frequency Division Duplex TDD: Time Division Duplex SFN: Single Frequency Network MBMS: Multicast Broadcast Multimedia Service D-ICIC: Dynamic Inter-Cell Interference Coordination Page 9

10 High Quality Synchronization Transport Time Stamp BTS T1 Time Stamp ~ PRS (Primary Reference Source) NodeB FE GE/10GE RNC BTS NodeB T1 FE ppm Freq offset within +/ ppm IEEE 1588v2 and Sync Ethernet provides network synchronization Page 10

11 IEEE1588v2 MTIE Sync Test Results China Mobile Test results for 32 nodes Test results below G.823 MTIE mask and meets sync spec Page 11

12 End-to-End Ethernet OAM Capability UNI UNI Customer Equipment GE Edge Transport Network Edge GE Customer Equipment IEEE 802.1ag /ITU Y.1731 Service Layer OAM UNI to UNI Ethernet Layer ITU Y.1731 Connectivity Layer OAM Line link layer IEEE 802.3ah Access Link OAM Access Link OAM Customer-side link layer ITU-T Y.1731 IEEE 802.3ah ETH-CC Link connectivity check ETH-LB Link monitoring ETH-LT Remote failure indication ETH-AIS, ETH-RDI Remote Loopback ETH-LM Remote loopback ETH-DM SDH-like OAM Performance IEEE 802.1ag Fault detection Fault notification Fault verification Fault location Page 12

13 Wireless Backhaul Summary 2/3G T1/E1 PRS ~ 4G FE GE T1/OC-N BSC 4G 3G T1/E1 FE T1/E1 FE 4G 3G GE/10GE RNC MSC (Mobile Switching Center) Support for 2G, 3G & 4G transmission Multi-Media Access: xdsl, xpon, Copper, Microwave, Fiber Multi-Point Microwave High Quality Sync Distribution: IEEE 1588v2, Sync Ethernet Linear, Ring, and Mesh Protection E2E Service Management Page 13

14 Copyright 2010 Huawei Technologies Co., Ltd. All Rights Reserved. The information contained in this document is for reference purpose only, and is subject to change or withdrawal according to specific customer requirements and conditions. Page 14 Page 14