Ericsson Software Engineering Internship

Gordon Bailey

September 2014 1

Hello!

• My name is Gordon Bailey

• 4th year COEN (Computer Engineering)

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Outline

• Company

• Group

• Personal Goals and Objectives

• Project

• Responsibilities and Tasks

• Problems Encountered

• Problems Overcome

• Project Results

• Personal Growth and Learning

• Benefits

• Recommendations

• Co-op Experience

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Company: Ericsson

• Swedish Telecommunications company, founded in 1876

• Supplies technology to network operators such as Rogers, AT&T, etc.

• 40% of global mobile traffic runs through Ericsson supplied networks

Image source: http://blog.broadcom.com/wireless-technology/5g-wifi-momentum-smartphones-spark-802-11ac-adoption/Image source: http://swaussie.se/2010/07/swedish-inventions-and-innovations/

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Group: Software Technology & New Developments• Software oriented Research & Development Group

• Creates proof-of-concept prototype products

• Focused on producing working software fast

• Does not produce production-ready products

Image source: http://www.planetcreator.net/hacked-information-and-proof-of-concept-planetcreator-net/5

Personal Goals and Objectives

• Continue developing technical skills

• Learn more about how software industry functions

Image source: http://curemd.wordpress.com/2012/06/12/the-road-to-emr-adoption/6

Project: Cloud IMS Proof-of-Concept

• Definitions• Cloud Computing

• Processing spread over a network

• Resource shared and spread across network

• Goal: Improved scalability

• IMS – IP Multimedia Subsystem• Infrastructure behind Voice Over IP telephony (and many other services)

• Proof-of-Concept• A basic implementation of an idea to demonstrate its feasibility

• Purpose is to demonstrate that a concept has a potential to be useful.

• Not a complete, full-fledged product.

Image source: http://www.sosforparents.com/definitions/7

Project: IMS

The full picture looks very complicated

Image source: http://en.wikipedia.org/wiki/IP_Multimedia_Subsystem8

Project: IMS

We only implemented a small subset of this complexity for our proof-of-concept

CSCF

HSS

MRFC

MRFP

Application Server

WLAN

Enough to do voice calls between cell-phones over a local WiFinetwork (WLAN)

Image source: http://en.wikipedia.org/wiki/IP_Multimedia_Subsystem9

Project: Cloud

• Traditionally each service shown on the previous slice (CSCF, HSS, MRFC, etc.) would run on its own dedicated physical or virtual machine.

• Cloud approach abstracts services from hosts.

• Our Proof-of-Concept included software for managing this abstraction.

• Will not discuss in detail.

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Responsibilities and Tasks

• CSCF – Call Session Control Function.

• Uses Session Initiation Protocol (SIP) to establish phone calls

• Essentially a SIP router - infrastructure/glue that controls a phone call.

• Routes all signalling within a call.

CSCFImage source: https://www.iconfinder.com/icons/134149/call_phone_telephone_icon

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Problems Encountered

• Understanding SIP routing!

• SIP Standard (IETF RFC 3261) is over 200 pages long!

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Problems Overcome

• Despite complexity, SIP is logical and consistent

• SIP Standard is extremely large, but also extremely detailed• Nothing is left to the imagination

• Detailed description of proper behaviour for almost any scenario

Image source: http://www.pearlinitiative.org/blog.html13

Project Results

• Success!

• We were able to achieve multiple concurrent calls distributed over many physical machines

• CSCF (my part) working correctly, and quite stable

Image source: http://postsfromthepath.com/posts/what-success-is/14

Personal Growth and Learning

• Learned a lot about IMS architecture and Session Initiation Protocol!

• Gained a lot of experience in researching new technologies• Ask knowledgeable colleagues

• Refer to standards / specification documents

• Experiment!

Image source: http://www.acpcomputer.edu.sg/index.php/the-essentials-of-e-learning/15

Benefits

• Learned a lot – both soft skills and technical skills.

• Fun experience – developed good relationships with colleagues.

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Recommendations

• Try something new!

• Don’t just stick with what’s comfortable.

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Co-op Experience

• Vital part of school experience

• Thank you co-op!

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Questions?

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