Vancouver, BC July 27-30, 2015

Birds of a Feather

Carrier Ethernet Servicesover LTE

Rami Yaron, Telco SystemsGlenn Parsons, Ericsson

2

Agenda

• Motivation/Background• LTE• Potential solution

Motivation

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85% mobile by the end of 2020

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Motivation

• More and more traffic is now terminated on mobile devices• Customers would like the same SLA weather they are at the

office, home, or traveling • Fiber availability is limited • Copper plants are old and deteriorating• Optimized for low bandwidth (T1 replacement) • Low CAPEX (FedEx vs. Technician)• Service on demand (time to deliver = Revenue)• Fast activation • High availability services • IoT• OOB management for SDN networks

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Use Case # 1

Primary Connectivity

Using LTE for primary connectivity in rural area that have no other transport method

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Use Case # 2

Backup Connectivity

Using LTE as backup connectivity for high availability traffic

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Use Case # 3

Temporary Connectivity

Using LTE for immediate connectivity till primary connectivity is ready

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Use Case # 4

Internet of Things

Machine to machine low bandwidth communication

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Use Case # 5

Backdoor for Management

Using LTE for OOB management traffic

LTE

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LTE

• LTE supports ~100M

• LTE-A Supports up to ~300M

• LTE could support SLA/policy per user/group

• Multi CoS could be supported over LTE (requires CoS mapping)

• CIR could be supported (requires dedicated Bearers)

• 3GPP release 10 support IP fragmentation

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LTE Advanced

Enhanced ICIC

Coordinated Multi Point

+++

Carrier Aggregation Multi-antenna

extension

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• Single Data Radio Bearer Service– Carries user traffic between EPS and the user terminal– Non-Guaranteed bit rate – Multiple data flows can be multiplexed onto single data radio bearer

Internet EPS

EPCLTE

Peer EntitySAE GWUE eNB

End – to – end service

EPS Bearer Service External BS

LTE Radio Bearer Service LTE Access Bearer Service

Physical Radio Bearer Service Transport Bearer Service

LTE Single Radio Bearer per User

Carrier Ethernetover LTE

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Wireless Access Solution: LTE/EPC

• Standard EPC (with a small addition)...– Dedicated bearer per access seeker – with CoS mapping

• CPG (SGW/PGW/WGW) deployed at Exchange points– Encapsulating Ethernet Frames in IP for transport over the

LTE/EPC Network– Mapping Layer2 QoS to Layer3 QoS

MINI-LINK SGW / PGw

eNB Encap

SAPC

Access Seeker

WGW

MME

CPG

WirelessModem

WNTD

UNIClient

LTE

HSS

SP310

EVC/OVC

UNIClient

Access Seeker

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Core Related Features

• Ethernet over LTE (Soft-GRE)• C-VLAN and S-VLAN Tagging• Multiple Bearers, via DSCP TFT QCI Selection• Combined CPG

– Core Site Router and Edge-Switch Design

• MME Pool • No Mobility or Charging

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WNTD features

• WNTD – Wireless NTU Terminal Device– Specification to match Core features

• Subscribers fixed/locked to a cell – using eNB PCI (Cell ID)

• Provisioning Server for WNTD• Also supports

– SOAM – (802.1ag and Y.1731)– Ping Monitor: multi-level periodic ping: the CPG,

Soft-GRE end-point, MME, etc.

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MTU: No Fragmentation E2E

C-TAG FCS

FCS

Ethernet Payload

Ethernet Payload

TAG FCS Ethernet IP UCP GTP IP GRE MPL5 Ethernet Payload

IP GRE MPL5 Ethernet Payload

TAG FCS Ethernet IP GRE MPL5 Ethernet Payload

C-TAG FCS Ethernet PayloadS-TAG

Ethernet

4 bytes 4 bytes

4 bytes 14 bytes

1500bytes

4 bytes 4 bytes 14 bytes

20 bytes

8 bytes 8 bytes 20 bytes

4 bytes 4 bytes 14 bytes

1500bytes

4 bytes 4 bytes 14 bytes

1500bytes

4 bytes 4 bytes 14 bytes

20 bytes

20 bytes

4 bytes 4 bytes 14 bytes

1500bytes

4 bytes 4 bytes 4 bytes 14 bytes

14 bytes

DST MAC = 6 bytes +SRC MAC = 6 bytes +EtherType = 2 bytes

802.3 Ethernet Frame ContentsEthernet header

SRC = Loopback MACDST = IAC context dot1q

Interface

Ethernet headerSRC = SGW S1U

DST = enodeB s1U l/f

WirelessNTU

eNodeB

Air InterfaceEncapsulation

Loopback

Backhaul

OR CPG

1500bytes

MEFUNI

MEFUNI or ENNI

Encap

SGW / PGw

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Challenges

• SLA over wireless is difficult to guarantee– Air interference

• Picking an Ethernet over IP tunnel protocol– Any specification would be of the tunnel

protocol (inside the EVC) and its configuration• Mapping to a dedicated bearer

– Including maintaining CoS marking and treatment (inside the EVC)

• Maintaining GRE tunnel during core failure events

end of session

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