open telecom -...

Alexander ChemerisCEO, fairwaves LLC

GSM re-invented

Open Telecom:from software to hardware

Alexander Chemeris twitter: @chemeris e-mail: [email protected]

Presentation plan

1. Closed NOW

2. Open GSM

3. Open future


Mobile spectrum is a licensed resource,

i.e. you need a license to use this spectrum (unlike WiFi).


Mobile spectrum is a licensed resource.

Phones are exempt, but operators need a license.


Spectrum regulation

The good: Allows high QoS Enforces coverage

The bad: Cost money ($mlns or even $$$blns)

The ugly: Limits competition


Open Spectrum

≠Unlicensed

Don't forget about interference!


Mobile networks today

Walled gardens

Proprietary

Insecure

… tremendously popular


Why insecure?

Few eyeballs

Tested only for a standard conformance

No co-operation among vendors


Don't fuzz livemobile networks!

They're too fragile.

© 2010, some 27C3 speaker


Mobile networks —next frontier

for open-source

We have to change the mode of operation of mobile networks


Presentation plan

1. Closed NOW

2. Open GSM

3. Open future


Open-source GSM

OsmocomBB – GSM phone stack

OpenBSC – GSM core network

OpenBTS – GSM base station with VoIP backend


GSM Baseband software implementation

http://bb.osmocom.org/

ARM CPU

some DSP

RF

Application processor:runs OS, GUI, apps

Baseband processor (“modem”):talks to a network

RF frontend:generate radio waves


OsmocomBB

Features:

Makes calls

Sends SMSs

F/OSS!

Limitations:

Early stage

Requires a PC

Closed hardware


OpenBSC –GSM network-in-a-box,implementing the minimalnecessary parts to builda small, self-contained

GSM network.


OpenBSCUses existing base stations hardware


OpenBSC

Features:

Handles calls, SMS, etc

Stable

F/OSS!

Limitations:

Limited features

Low scalability

Closed hardware


OpenBTS –GSM-VoIP network-in-a-box,

uses a software radio to present a GSM air interface to standard 2G GSM handset and

uses a SIP to connect calls.


OpenBTSUses software radio

VoIP network


OpenBTS structure


OpenBTS RF chain


UmTRX

A transceiver for• low-cost,• mid-range,• power-efficientGSM base station

and more...


Presentation plan

1. Closed NOW

2. Open GSM

3. Open future


Open future

Other Osmocom projectshttp://osmocom.org

OpenLTEhttp://sourceforge.net/p/openlte

Wireless Innovation Forum's "Open Source Framework for Commercial Baseband Software" –LTE/Cognitive Radio

… your project here?

GSM re-inventedAlexander Chemeris

[email protected]+7 (915) 330-7626

skype: Alexander.Chemeristwitter: @chemeris

Sergey [email protected]

+7 (903) 130-2310


Open-Source Hardware

• Editable design files are published

• You're allowed to

o distribute,

o modify,

o manufacture.


Purpose and users

• Small/tiny carriers

• Developing regions

• Rural and isolated areas

… not to compete with Big Guys


UmTRX architecture

1GigE

FPGAXilinx Spartan 6 LX75

Power GPSEB230

1 PPS

Rx

Tx

Rx

Tx

controlcontrol

Ref. Clock

TCXO26 MHz

duplexer +LNA+PA

duplexer +LNA+PA

Flash

LMS6002D

LMS6002D

SP

I

UA

RT

switch

switch

GPIO

GPIO

SRAM


UmTRX specification

• Dual TRX

• GPS-locked clock

• Euro-cardform-factor

• 3mW output power

• Ethernet connection

15 voice channelscheap Power Amplifiersdiversity receive

no maintenanceno costly OCXO

many enclosures

standard for BTSamplifies to any value

standardreliable


LMS6002D

› Single chip transceiver› 375MHz-4GHz.› Programmable

bandwidth: 1.5-28MHz› 12-bit ADC and DAC› Tx RF output +6dBm,

continuous wave


Modified UHD firmware & software

1. Works with OpenBTS

2. Works with OpenBSC

3. Even with GnuRadio


Mayotte project

Coordinates12 50 S, 45 10 E

Kilometers of coastline185.2 kilometers

Square kilometers of land374 square kilometers

Square kilometers of water0 square kilometers

Population178,437 (July 2003 est.)

Target

low-cost GSM network

affordable communications

uses open-technology

hack & learn


About Fairwaves LLC

• Moscow based company, founded in Jan 2011.• Focuses on development of cost-effective mobile access

solutions.• Provides software and hardware development services in

the area of SDR.• Owns world-leading IP in LDPC error-correcting codes, smart

antenna systems and wavelet filtering of RF signals.• Alexander Chemeris, CEO, holds Master degree in Computer

Science and during last 6 years was involved in various projects on VoIP, video-conferencing and wireless technologies as senior engineer, project manager and consultant, including many open-source projects.

• Prof. Dr. Sergey Portnoy, Chairman of the Board, received doctoral degree in 1992 for his achievements in cascaded modulation and coding schemes, nowadays known as OFDM. For the last 20 years he has been building wireless networks and promoting wireless access in Russia. At this moment he holds positions of WiMAX Forum Regional Director, Chairman of the board of ZAO Cedicom (equipment distribution),VP Strategy of ZAO Antares (emerging LTE operator).

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