Wireless Wireline Convergence - WOCC 2007 Wireless Wireli… · Wireless Wireline Convergence Tod Sizer, Director Broadband and Wireless Research Center Bell Laboratories

Wireless Wireline Convergence

Tod Sizer, Director

Broadband and Wireless Research Center

Bell Laboratories

p.2 | Wireless/Wireline Convergence – Bell Labs - Sizer | 27Apr2007 All Rights Reserved © Alcatel-Lucent 2007


The past decade has seen unprecedented growth in both Wireless and Broadband Wired Communications.

•Wireless

•2G evolving to 3G

•WiFi becoming standard in PCs

•High Speed Cellular deployments of EVDO and

HSDPA

•Near universal usage and coverage in the developed

world.

•Broadband Wireline

•Telephony modems evolving to Broadband connects.

•Core Network technologies above 25 Tb/s.

•Fiber to the home, such as Verizon FiOS

•Growth of Internet and email as the standard for non-voice

communication.



In this talk:

Circuit Emulation: T1 Ethernet evolution for Wireless Backhaul

Wireless bandwidth transport over Ethernet [RadioStar]

Femtocells for the home

Growth of Wireless and Wireline deployments offers opportunities for convergence of the technologies for the

benefit of the user.


Circuit Emulation

T1 over Ethernet for Wireless Backhaul


Evolution of wireless backhaul

Today’s base stations are largely backhauled using T1/E1 lines.

For cost, flexibility, and OA&M (Operations, Administration, and Maintenance) reasons, this will want to evolve to Ethernet.

How do we manage legacy equipment in this evolved world.

Can we provide adequate circuit emulation of T1/E1 signals over Ethernet to be able to rapidly evolve the wireless backhaul of Wireless Base Station?


Circuit emulated through the Wireless backhaul

Ethernetbackhaul

T1interface

Ethernetinterface

Span of T1circuit

T1 payload packetized and sent over the

Ethernet backhaul

EthernetInterface

Circuit emulated over Ethernet

RNC

BTS


Circuit Emulation

First step in wireless backhaul evolution

RNC and BTS still speak T1 (installed base and/or legacy sites)

Backhaul is migrated from circuit switched to packet switched

Full circuit emulation is needed across the Ethernet backhaul

Base station does not have access to Network system clock

The System clock needs to be transferred over the Ethernet link.

T1/E1 are synchronous whereas Ethernet is asynchronous.

Adaptive clock recovery or SRTS with packet-based distribution of common timing reference (IEEE1588 or NTP)

This is the most difficult form of circuit emulation

Next step in Wireless Backhaul would evolve to pure Ethernet


Backhaul Solutions

•Packetize

•Provide T1/E1 synchronization

•Syn

chro

nous

T1/

E1 L

ines •100/1000 Base F

•100/1000 Base TWireless Base Station


Transport of RF over Ethernet

RadioStar


RadioStar Technology: CDMA over Gigabit Ethernet

BTS withBSI

Equipment Closet

Gigabit Ethernet Switch

RRHw/ PoE

RRHw/ PoE

CAT5 Cables

Digitized CDMA/UMTS RF signal is distributed in-building through switched Gigabit Ethernet packet data network using LAN CAT5/fiber cables (potentially existing).

Same system can transport CDMA 1X, EV-DO, or UMTS signals.

Interface to BTS through baseband I/Q or RF radio input and output. (no modification of BTS required)

Remote Radio Heads (RRHs) based on handset technology and powered over CAT5 cable radiate downlink signal and receives uplink signal.


Radio Digitizing Technique

Base Station Mix Radio SignalTo Baseband

Digitize RadioSignal

Packetize digitized Radio Signal

Base Station Interface

Depacket digitizedRadio Signal

Digital Analog Conversion

Mix Radio SignalTo RF

Remote Radio Head

Synchronization

Ethernet Network


Sector α

Sector β

Sector α

Sector β

Scalable Network [dynamic optimization]

RRH

RRHGESBSI

RRH

GES

RRHGES

RRHRRH

GESRRH

BSI: base station interface GES: gigabit Ethernet switchRRH: remote radio Head


Key RadioStar Features

Take advantage of Gigabit ethernet equipments, components and CAT5/fiber medium

Software sectorization for capacity management and growth

Remote management of indoor network.

Capability to support 802.11 over same infrastructure

Transport RF bandwidth, air-interface agnostic – RadioStar network need not be modified as services and applications change

Low cost RF components from handset technology

Use of PoE (Power over Ethernet) technology eliminates the need for power provisioning at the remote radio heads.

Frequency and timing synchronization over asynchronous networks.


2nd Generation RRH Digital board (July 2005)

Form Factor : comparable to 802.11 access point

AccessPoint7”x2”x9”802.11 only

RRH 9”x6.5’x2”CDMA/UMTS and 802.11

POE : enables installation , no extra AC drop constraints: 100m , ~11W (currently)

802.11 access card : PCMCIA (contingent on Linux load)


RRH Coverage at 14dBm Pout

90ft Radius for -75 dBm

RSSI

30ft Radius for –75dBm

RSSI

4th Floor

3rd Floor

RRH


Wireless Enterprise [WINGS]

WINGS OpportunityProvide enterprise phone and data service using Wireless Cellular technology.Your Cell phone = Your Enterprise PhoneKey Enabling Technology: RadioStarfor low cost, high quality, in-building cellular coverage.

Value PropositionFor the User

•One phone/One number to Reach Me•Complete mobility•Latest mobile communications technology to help me do my job.•Zero cost Moves, even between locations•Mobile data provided by high speed wireless data (e.g. either EV-DO/HSDPA or 802.11)•Increased productivity due to easy access to your information anywhere in the enterprise as well as anywhere there is cellular coverage.

RadioStarIP Router


HomeBSR / Femtocell


Femtocell in home backhauled with existing broadband connection

UMTS Core Network

IP Access Network

ExpensiveExpensiveTo achieve good To achieve good UMTS inbuilding UMTS inbuilding

coveragecoverage

CheapCheap

Femtocell controls Internet bandwidth allocation for QoS

In home UMTS air interface

FemtocellFemtocellcoveragecoverage

Ethernet 100 BaseT

Router

Signalling Gateway

DSL connection

Femtocell

UMTS air interface

100 BaseTethernet


Femtocell Advantages

Provides excellent coverage in the home.

Improves Universal Coverage and thus user expectations for voice and data performance.

Improves the outdoor cell performance by off-loading indoor calls from the outdoor cell.

Lowers cell user churn by improving the quality.


Technical Challenges

Auto-configuration

End user installation, plug and play, automatic environment discovery, automatic provisioning, remote management

Low cost hardware

Consumer electronics, extreme cost pressure

Mobility

Idle and active mode handover between Femtocell and macrocell

Identification of femtocells within the mobile network

Synchronization

Meet the air-interface synchronization requirement with low cost hardware

Supporting both voice and data users

Legacy mobiles only capable of circuit switched voice

New services require wireless data capability.


Conclusion

We are at a unique time when growth in both wireless and wirelinetechnologies are allowing for new opportunities.

Existing infrastructure can be made more cost competitive by using new Wireless backhaul methods.

Ethernet infrastructure in enterprises can make cellular coverage as straightforward to provide as a streaming application such as VoIP or IPTV.

Broadband to the home can bring wireless to the residence improving quality for the user and easing the outdoor requirements for wireless service providers.

Documents

Wireless Wireline Convergence - WOCC 2007 Wireless Wireli… · Wireless Wireline Convergence Tod Sizer, Director Broadband and Wireless Research Center Bell Laboratories