Ultra-Low Latency Ethernet Ethernet Everywhere Network Technology - - PowerPoint PPT Presentation

HUAWEI TECHNOLOGIES CO., LTD. www.huawei.com

Network Technology Lab of 2012 Labs

Ultra-Low Latency Ethernet

Ethernet Everywhere

James.huang@huawei.com

HUAWEI TECHNOLOGIES CO., LTD.

Page 2

What is Required for 5G X-Haul Network?

BBU pool

• l

RRU RRU S1 S1 RRU RRU eNod

• deB

eB S1 S1 Ethernet t based X-Hau Haul netwo twork eCPRI RI EPC EPC

eCPRI: Next vers rsion CPRI based on Ethern rnet, see http://www.cpri ri.info/pre ress.html

 Unified data plane for both Fronthaul and Backhaul;  Ultra low latency and CPRI / eCPRI support;  Leverage the Ethernet mature ecosystem

EPC for Smart Phone

Backhaul Slice1 for Smart t phone Backhaul Slice2 for V2V Backha haul ul Slice3 e3 for IoT Fronth thaul slice

EPC for V2V EPC for IoT

BBU U pool Ethernet t based X-Hau Haul netwo twork

Smart Phones Vehicles IoTs

Integra rated Fronthaul / Backhaul Network rk Slicing  Hard isolation to get guaranteed QoS  Ultra low latency  High bandwidth utilization

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Page 3

Latency in Common Network Devices

Network processing latency and isolation effect in OSI model

Less Latency Better Isolation Effect

OSI layer NE NE latency L0

Optical equipment (ROADM, Mux/Demux, Filter, Coupler)

~ns

L0

EDFA Optical Amplifier

~100ns

L0

Fiber(including DCF)

5us/km

L1

OTN node (Mapper/Memapper, FEC, Switch)

10us~100us Load-independent

L1

SDH node ( Mapper/Demapper, Switch)

~100us Load-independent

L2

L2 Switch

ms~10ms Load-dependent

L3

Router, L3 Switch

ms~10ms Load-dependent

Latency Analysis of Network Equipment Framing FEC Store-Forward Line coding Switching Address lookup Packet forwarding Routing TCP windowing Flow control Packet re-send Application Presentation Session Bits Frames Packets Segments Data 1 2 3 4 7 6 5

Source: Chine Telecom “Low latency Optical Network Technology White Paper” http://www.ctbri.com.cn/news/content.jsp?Id=100&Flag=-1

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Page 4

How to Achieve Low Latency in Ethernet?

Physical Data Link Network Transport Session Presentation Application PMD Medium L1 L2 L3 L4 L5 L6 L7 PMA PCS RS MAC IP / MPLS L3 Medium L0

Ethernet

L2 X-Ethernet Physical PCS MAC IP / MPLS Medium Physical PCS MAC IP / MPLS Medium

Routing Switching X-Et Ethern rnet Relay

Ethernet PCS laye yer relay is implemented to get less ss latency

• cy. This

s method is based on Native Ethernet. We call it “X-Ethernet” .

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Page 5

X-Ethernet Feature: Ultra-Low Latency

PHY HY PCS / PHY PHY HY PCS / PHY Media Media MAC MAC

64/6 /66b Code Block

1 0 1 1 0 1

X-Ethernet Relay

Bit stream

64/6 /66b Code Block

Ethernet Switch ching

Frame Packet

IP IP IP IP IP Routing

 Base sed on 64B/66B block ck stream  Eliminate table looku kup and buffer queuing  Direct support to various s types s of traffic, c, such ch as Ethernet MAC, CPRI, eCPRI

X-Et Ethern rnet

…

Ethernet MAC CPRI eCPRI

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Page 6

X-Ethernet Feature: E2E Hard Pipe

 Build E2E pipe through X-E Relay  Provi vide support to SDN control

PHY PHY Media L2 / L3 X-E Node

PCS

PHY PCS X-E

Relay Media X-E Node X-E Node End Station End Station

PHY X-E Node

PCS

PHY PCS X-E

Relay Media L2 / L3 forwarding L2 / L3 forwarding End Station End Station PHY

L2 / L3

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Page 7

X-Ethernet Feature: Hybrid Multiplexing

 Unique multiplexing scheme to improve network resource usage Network Node

Foreground Traffic Hard Pipe 1

Network Node

Foreground Traffic Hard Pipe 2 Background Traffic Foreground Traffic Hard Pipe 1 Foreground Traffic Hard Pipe 2 Background Traffic

Traditional Hard Pipe (no sharing)

X-Ethernet Node

Foreground Traffic Hard Pipe 1

X-Ethernet Node

Foreground Traffic Hard Pipe 2 Background Traffic Foreground Traffic Hard Pipe 1 Foreground Traffic Hard Pipe 2 Background Traffic

X-Ethernet’s Hard Pipe (Hybrid Multiplexing)

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Page 8

Possible X-Ethernet Device Architecture

 Ethernet PCS layer relay capability integrated in packet device, e.g. a router  Latency sensitive data stream forwarded through PCS layer relay  Common data stream go through NP and TM for L2/L3 processing

Ethernet PCS Relay

NP + TM

MAC MAC PCS PCS

NP + TM

MAC MAC PCS PCS

Idle insert /delete PHY

PCS Layer

Idle insert /delete PHY

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Page 9

X-Ethernet PoC

 Two 10G ports s (SFP+) and six 100G ports s (CFP2)  10G ports s support 10GE or 9.8G CPRI and 100G ports support X-Ethernet or Native ve 100GE  PoC with FPGA runn nning ng at 156M 6MHz, z, switch ching latency cy is about 300ns; s;

CPRI Ethernet

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Page 10

X-Ethernet PoC

• Test in the lab is finished.
• Next to consider interworking with RRU/BBU, network slicing, etc.

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Page 11

Ta Target of the e Work

 Research rch project ct  Looki king for research rch collabora rations