A description of my third and final internship at Ericsson, presented to my classmates in partial fulfillment of the requirements of the Concordia University Institute for Cooperative Education.

1. Ericsson Software
Engineering Internship
Gordon Bailey
September 2014 1

2. Hello!
• My name is Gordon Bailey
• 4th year COEN (Computer Engineering)
Image source: http://powerpig.storenvy.com/products/1014355-my-first-computer-hello-edition 2

3. 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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4. 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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5. 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/
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6. 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/
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7. 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/
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8. Project: IMS
The full picture looks very
complicated
Image source: http://en.wikipedia.org/wiki/IP_Multimedia_Subsystem
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9. 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 WiFi
network (WLAN)
Image source: http://en.wikipedia.org/wiki/IP_Multimedia_Subsystem
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10. 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.
Image source: http://nanobitwallpaper.com/computer-technology/
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11. 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.
CSCF
Image source: https://www.iconfinder.com/icons/134149/call_phone_telephone_icon
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12. Problems Encountered
• Understanding SIP routing!
• SIP Standard (IETF RFC 3261) is over 200 pages long!
Image source: http://www.womanatics.com/2012/04/10-books-that-i-love-to-read.html
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13. 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.html
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14. 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/
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15. 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/
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16. Benefits
• Learned a lot – both soft skills and technical skills.
• Fun experience – developed good relationships with colleagues.
Image source: http://sputnik-network.net/?page_id=44
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17. Recommendations
• Try something new!
• Don’t just stick with what’s comfortable.
Image source: http://www.pack337.org/images/
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18. Co-op Experience
• Vital part of school experience
• Thank you co-op!
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19. Questions?
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