Mobile Broadband Ecosystem

Mobile Broadband… You might have heard this term before, possibly in an ISP environment. The term has always represented a name of a department within a mobile operator or a vendor organization. It is always there in profile description for telecom professionals. It is everywhere actually when it comes to a certain ecosystem or framework that delivers Internet Service using Mobile Network.  

To have a great understanding of SP Networks, you can check my new published “Service Provider Networks Design and Architecture Perspective” Book.Let me bring the Wikipedia definition followed with a small note … Mobile broadband is the marketing term for wireless Internet access through a portable modem, mobile phone, USB wireless modem, tablet or other mobile devices.

Definition is true but the note here is that you can’t rely solely on google to understand the MBB related technologies (EDGE, UMTS, 4G/LTE, etc.) because what is in google is mainly the marketing articles and the vendor specific publications which is fine but as a lesson learned, one need always to understand the technology concept decoupled from vendors influence.

The good thing is that the whole knowledge, principles, & Service descriptions for Mobile Broadband is there in the standards. Mainly the 3GPP which is freely accessible. So I’d clearly say that the “debate” that it is hard to get the knowledge of the MBB is “debatable“! One just need to know how to get the information? Which 3GPP standard Specifications? Which 3GPP Release?

Throughout this article, I am going to talk about the Mobile broadband evolution and the related standardization specifications which will enable the audience to see the big picture of the MBB and the plan is that by the end of the Five articles series, readers will be on the Mobile Broadband Track.

The Mobile Systems in general are classified into generations (2G, 3G, 4G, 5G) and for every generation, there are a set of standards specifications that describe the related service descriptions, interfaces, protocols, Call flows, etc. 1G That was the first generation of Analogue Mobile systems firstly launched by NTT Docomo in 1979 and then that was followed by commercial deployments in the Nordics and the US in the early 1980’s.

It was more like Direct Dialling rather a network architecture controlled by the Operator. FDMA, Frequency Division Multiple Access technique was used by the Analogue Technology to serve Voice Calls. No Data Service were offered by 1G. 2G GSM (Global System for Mobile Communication) was a standard developed by ETSI, European Telecommunications Standards Institute to realize the 2G digital Cellular Network.

With the first Commercial deployment in Finland (Radiolinja) in July 1991. GSM had the target to deliver a Digital Circuit Switching network that is capable to deliver voice services. One can conclude that the 2G GSM technology is a pure circuit switching network delivering voice service with no data service offered.

This understanding will help us to understand the evolution of GPRS and Edge Technologies. From the standardization perspective, the early GSM releases were called GSM Phase 1 & GSM Phase 2. The logical architecture of 2G Network that was introduced by this release is shown below


The Yellow Highlighted Network Elements are representing the RAN (Radio Access Network) Domain and can be called BSS (Base Station Subsystem) in some other contexts while the green highlighted network elements are representing the CN (Core Network)

  • BTS: Base Transceiver Station
  • BSC: Base Station Controller
  • MSC: Mobile Switching Center
  • GMSC: Gateway MSC
  • ISC: International Switching Center
  • HLR: Home Location Register
  • VLR: Visited Location Register
  • EIR: Equipment Identity Register
The diagram is simple just to give an overview of the 2G architecture. The function for every Network Element will be illustrated in next articles. The Catch here is that the early 2G didn’t provide a framework for Data Service and the network is solely serving CS Services. All Core Interfaces were based on Legacy SS7 interfaces. The term Circuit Switched was very dominant in a way there there were no IP Interfaces, No Data Services, and no Supporting handsets by that time.

Post releases are named GSM Phase 2+ (R96, R97, & R98). Starting from GSM Phase 2+ (Release 96), There were some attempts to allow the network to deliver Data Services in addition to Voice. The R96 specs are referring to 14.4 Kb/s User data based on High Speed Circuit Switched Data so still the enhancements were provided on Circuit Switched Network.

Release 97 brought some good news for Data Services where it introduced GPRS (General Packet Radio Services) on both Radio Part and Network Part and thus, the Network architecture has shifted to the below architecture to provide the PS Core Network (Packet Switched Core Network) R97 Architecture - R97 Updated SGSN: Serving GPRS Support Node GGSN: Gateway GPRS Support Node The two main network elements of PS Core Network (SGSN & GGSN) were introduced in 3GPP Release 97.

The Protocol used between SGSN & GGSN over the Gn/Gp Interface is GTP, GPRS Tunneling Protocol (Over UDP/IP) and that was the first IP interface introduced by that time together with the Gi Interface which is a transparent IP interface to Internet. GPRS typically reached speeds of 40Kbps in the downlink and 14Kbps in the uplink.

At this stage, technically and theoretically we are still at 2G but because of the introduction of the Data service and for an efficient marketing of the new service; vendors and Operators introduced a new Marketing term which is the 2.5 G. So, here is a catch; The marketing term 2.5 G refers to R97 introduction of GPRS over the GSM network. Evolution continued on R98, and EDGE technology was introduced at the radio side achieving 384 Kbps data rate (almost 3G) but that was not accompanied with any change in the Core Network.

Again, the evolution was labeled 2.75G by industry operators so that’s another marketing term referring to EDGE technology. You might have seen the letter “E” for Edge on your mobile phone while being covered by 2G coverage. 3G The UMTS (Universal Mobile Telecommunications System) was introduced as part of 3GPP Release 99 together with EDGE enhancements. New Interfaces has been added and new Network Elements as well such as Node-B & RNC that resembles the BTS & BSC in 2G. The logical architecture of 3G Network introduced by R99 release is shown below


Theoretical rates refer to 2 Mbps for both Uplink and Downlink however, actual rates by that time were 384 Kbps. The Network has become more ready to welcome the “All-IP” Interfaces that is introduced in the following release (Release 4). The concept of All IP Network has been introduced in 3GPP Release 4 where the SS7 legacy interfaces have been standardized for a Sigtran deployment (SS7 over IP). 3GPP Release 4 is a popular release for CS Core Network where the Split of Control Plane & User Plane was achieved by introducing the Media Gateway handling the UP and dedicate the MSC for handling the CP.

There was no change in the PS Core Network architecture of R99. In R5, The major enhancement was on the air interface introducing HSDPA (High Speed Downlink Packet Access) reaching theoretical rates of 14.4 Mbps and also this release has introduced the IMS (IP Multimedia System). R6 added the HSUPA (High Speed Uplink Packet Access) evolution that achieves 5.76 Mbps on the Uplink.

Note : In Mobile Broadband, Downlink is the direction from Network to MS and Uplink is the direction from MS to Network. R7 Introduced the evolved HSPA (HSPA+) with typical speeds of 42 Mbps. The 3GPP Release 7 is a well know release in the PS Core domain because it introduced a very well established and deployed Architectural feature which is the Direct Tunnel giving the option that user plane is established directly between RNC and GGSN bypassing SGSN.


Same like Edge 2.75G, The HSPA technology has been marketed by some marketing terms such as 3.5G & 3.75G. You should see the “3G”, “H”, or “H+” signs on your mobile according to the technology deployed by your carrier. LTE (A step towards 4G) 3GPP Release 8 is one of the main Evolutionary stages when the 3GPP community decided to use IP (Internet Protocol) as the key protocol to transport all services.

A new Core Network Architecture was introduced as an evolution for the Packet switched Core in GPRS/UMTS under name EPC (Evolved Packet Core) with a direction to not have a circuit-switched domain in the sense that the new EPC would deliver both Data and Voice services. In old release, the RAN needed to integrate to both CS & PS network where in LTE the eNodeB is only integrated to EPC. The logical architecture of LTE/EPC is shown below

   

  • eNB: Evolved Node-B
  • MME: Mobility Management Entity
  • SGW: Serving Gateway
  • PGW: PDN Gateway
  • HSS: Home Subscriber Server
  • OCS: Online Charging System
  • PCRF: Policy and Charging Rules Function
That was the innovative LTE, Long Term Evolution that most of the operators of the world started to adopt with serious momentum towards 5G. The diagram below shown the difference between the main Packet Core reference architecture (R6, R7, & R8)


Scandinavian TeliaSonera deployed the first commercial LTE Network in June 2009. Theoretical Data rates were 300 Mbps but never reached more than 100 – 150 Mbps at this pilot stage (2009 – 2010).  

Here comes a well known confusion.. LTE is 4G or it is not? Does the evolutionary 3GGP R8 cover the 4G requirements?  

The answer is always the same … search for marketing! LTE was introduced and marketed by the term 4G although in the reality, it is not. From the standards perspective the 4G requirements are covered by LTE Advanced which is standardized in 3GPP R10 but however introducing the new ecosystem under name “3G” would have been misinterpreted. These 4G requirements are defined by ITU, International Telecommunications Union.

Please have a look on the below link for more insights about the 4G (LTE-A) requirements. http://www.etsi.org/deliver/etsi_tr/136900_136999/136913/08.00.01_60/ The confusion is still on going with LTE-Advanced being marketed as 4.5 G while it is 4G as per the standards evolution. 3GPP Release 8 provide a mean to have voice services over CS Network via CS Fallback as an alternative for Voice over LTE.

That’s justified because the Voice over LTE solution was not mature enough by the time of R8 being released and operators were not ready to migrate all voice services from CS network to LTE/EPC Network. Moving beyond R8, there is no big change in the Core Architecture. 3GPP R9 continued the enhancement of LTE radio side with some enhancement on the CSFB, & the Femto Cell. 3GPP R10 introduced the standardization of LTE-Advanced and is thought to be the standard 4G deployment.

3GPP R11 continued the enhancement of the radio Physical Layer, enhancements on the MTC, Machine Type Communications, Introduced the SaMOG enabling the integration between Trusted Non 3GPP Access (WiFi) to the EPC. 3GPP R12 and that’s the current “Frozen” release has made enhancements to the physical radio layer, Small Cells, & MIMO and Introduced the Device-to-Device proximity service. 3GPP R13 & R14 are still in “Open” state and some topics related to 5G are already discussed while the expected date for 3GPP 5G standardization release is June 2018.

There are a lot of details and bits & bytes that I’d like to discuss but I believe that this is sufficient for a first article in a 5 articles row. I hope that it gave an overview on the Mobile Broadband ecosystem and the corresponding standardization releases. I am going to build on that and start publishing a weekly article from the below List.

  • Article (2) – The Core Network Architecture (2G & 3G)
  • Article (3) – Mobile Broadband Essential Terms & Concepts
  • Article (4) – Getting the Service in 3G (under the hood)
  • Article (5) – Introduction to LTE
Thanks and waiting for your insights in the comment box below.

Created by
Orhan Ergun

Orhan Ergun, CCIE/CCDE Trainer, Author of Many Networking Books, Network Design Advisor, and Cisco Champion 2019/2020/2021

He created OrhanErgun.Net 10 years ago and has been serving the IT industry with his renowned and awarded training.

Wrote many books, mostly on Network Design, joined many IETF RFCs, gave Public talks at many Forums, and mentored thousands of his students.  

Today, with his carefully selected instructors, OrhanErgun.Net is providing IT courses to tens of thousands of IT engineers. 

View profile

Daniel Lardeux
Daniel Lardeux Senior Network Consultant at Post Telecom

I passed the CCDE Practical exam and Orhan’s CCDE course was very important contributor to my success. I attended the CCDE course of Orhan Ergun in July and it was exactly what I needed, Orhan is taking the pain to break down the different technologies.

Roy Lexmond
Roy Lexmond Senior Network Designer at Routz CCDE #20150017 & CCIE R&S; #26557

After I attended Orhan Ergun’s CCDE course I passed the CCDE practical exam.I really enjoyed the course a lot ...

Nicholas Russo
Nicholas Russo Network Consulting Engineer (CCDE/CCIEx2), Cisc

I signed up for Orhan’s CCDE training. This training is very technically detailed and the use-cases, quizzes, scenarios, and mind maps are all great resources in the overall training program. Orhan teaches his students to think like a network designer ...

Slide Heading
Slide Heading Network Systems Engineer at Conscia A/S CCIE #42544 (SP) & CCDE #20160015

Orhan is forcing you to take off the implementation hat that most of us have been wearing for many years, instead he is providing a new fancy design hat, which makes you see and deal with the issues presented ...

Kim Pedersen
Kim Pedersen CCIE in RS and SP (#29189) CCDE#20170021

I’ve used Orhan’s self-paced CCDE training material. If you are interested in knowing how all the technologies go together in a coherent design i can highly recommend it.I also enjoyed the Quizzes which helped pick out my weak spots in selecting ...

Laurent Metzger
Laurent Metzger 3xCCIE/CCDE Senior Network Architect

Hi Orhan. I passed the CCDE exam on February 22. I read everything that you put on your Self Paced CCDE Training course and it was very helpful in my success. Thank you very much.

Martin J. Duggan
Martin J. Duggan Network Architect at AT&T;, Ciscopress Author CCDE #20160006 & CCIE#7942

I attended Orhan’s April 201610 days CCDE Bootcamp. I am CCDE now !

You can tell Orhan has a great deal of experience, it really comes through when he presents his design case studies and the CCDE Practical scenarios.

Muhammad Abubakar
Muhammad Abubakar Lead Network Architect – CCDE #20160016 2xCCIE #26693 2xJNCIE VCIX

Your excellent CCDE materials and amazing Bootcamp helped me tremendously through my learning journey.Also thank you very much for being available whenever I have a design question or a complex design topics. I can’t compare your design skills ...

Jennifer Pai
Jennifer Pai Network/Security Engineer at KNET Technology

Thanks Orhan very much for this course. It helped strengthen my “Network design mind”.

Ruslan Silyayev
Ruslan Silyayev Solution Architect at R.I.S.K Company

Training by Orhan is not a CCDE preperation training only. It will be useful for engineers which are dealing with design. You want to pass CCDE exam or learn network design, then don’t look at anywhere else!

Sameer Meher
Sameer Meher Solutions Architect at 23 Wards/Japan

Orhan Ergun’s CCDE course was really very good. CCDE Level Intelligence was delivered very well and with very useful case studies and the scenarios, I am thankful to Orhan for all his help!

Ken Young
Ken Young Senior Technical Architect Province of Nova Scotia, 2xCCIE #41597 | CCDE #20170047

If anyone wants to understand network design and architecture, also pass CCDE exam , I recommend you to attend Orhan’s online courses! I am a CCDE now but learning is a journey, we will be together in your other courses too Orhan!

Matt Cross
Matt Cross Technical Architect at Heartland – CCDE #2019::7

Orhan did an excellent job of filling in the gaps of knowledge that I had that took me to the finish line of the practical exam CCDE. The community of people that Orhan facilitates are both engaging and supportive of the journey to CCDE. Orhan ...

Shiling Ding
Shiling Ding Sentinel Technologies – CCDE #2019::12

Just passed the CCDE Practical exam! I attended Orhan Ergun’s CCDE training program , used Orhan’s Instructor Led and Self-Paced CCDE training and Online CCDE Practical Scenarios during my CCDE journey. Orhan’s CCDE In Depth book is an excellent summary ...

Abelardo Basurto
Abelardo Basurto Solutions Architect at Cisco Systems – CCDE 2018::6

Hi everyone, I’ve just passed the CCDE Exam. My Number is CCDE 2018::6 I attended to Online CCDE Bootcamp of Orhan. I want to thank Orhan not only for the great book and bootcamp, but also for his commitment, availability and willingness to assist the ...

Hady Mohamed Abdellah
Hady Mohamed Abdellah Network Architect Hamad International Airport Qatar – CCDE 2018::1

Hi guys, I’m so happy that I passed the exam. I’ve already got my number CCDE 2018::1. Thanks to Orhan for being the best CCDE instructor in the world. I highly recomend Orhan’s CCDE Training and In-Depth-CCDE ...

Bryan Bartik
Bryan Bartik Sr. Systems Engineer at CompuNet – CCDE 20170059

Hi Orhan I passed CCDE Practical exam on November 2017 ! I really enjoyed your materials and quizzes and use cases. They were definitely helpful in my preparation. Thanks a lot !

Giedrius Trapkauskas
Giedrius Trapkauskas Network Solutions Architect at Liberty Global – CCDE 20180004

I attended Orhan’s CCDE Training in Istanbul and it was very helpful in my preparation. I passed the exam recently and I want to say Thank you Orhan! For those who want to pass the CCDE exam, definitely start with ...

Alaa Issa
Alaa Issa Sr.Solutions Architect – CCDE#20180033 3xCCIE ( Collab|DC|Security )#27146

I registered to Orhan’s training in Feb 2017. From that time, I attended Orhan’s training several times. The depth of knowledge which Orhan has is amazing, and how to present such consistent knowledge to the ...

Mazin Ahsan Design Lead Engineer | Solutions Engineer | CCDE License # 20160030 | CCIE Licence # 23892

I passed the CCDE Practical Lab exam on November 17,2016 from supplications of elders and dedication from my Sensei Mr. Orhan Ergun I took different CCDE bootcamps in the past. Orhan has the most depth and expertise ...

Jeff Patterson CCDE# 2018::11

Hi Orhan I wanted to pass along my appreciation for the outstanding training material. I used the online CCDE training provided by Orhan as well as the In-Depth-CCDE book and passed the exam in February 2018. Thank you Orhan!

Mehdi Sfar
Mehdi Sfar Network and Security Architect / CCDE #20210003 | CCIE R&S; #51583

I signed up for Orhan’s CCDE Self paced Course. This course, along with the CCDE In Depth book, helped me for my CCDE Practical as well as Written exams. It pushed me to ask the "WHY" questions and allowed ...

Related courses

Cisco CCDE v3 Training

71:39:34 Hours
225 Lectures
Expert

$1246

CCIE Enterprise Infrastructure Training

117:12:56 Hours
287 Lectures
Expert

$1246

Cisco CCIE Service Provider Training

108:43:00 Hours
258 Lectures
Expert

$1246