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IMS deployments – on the rise and around the corner

Published by in 3gpp, Arjun Roychowdhury, mobile, sip, voip, wimax on April 23rd, 2007

Are you surprised by the title? Well, that is really how I see things as it stands today. Based on my discussions with most OEMs and ISVs who have themselves been trialing all over the world for a few years now, we are just about at the phase when most trials are getting out into real deployment. Incidentally, incase you think that IMS all-IP ‘live’ deployments have not yet happened, think again. Remember, in 2006, there was an announcement that Wateem Telecom selected Motorola for a wimax deployment ? Well, that network does data and is ready for voice. Not sure if you knew, but that entire network is over an IMS subsystem (yes, you guessed it – WiMAX on its own is not a session specific architecture, while IMS is, so it makes sense to have IMS on WiMAX, huh ?). And yes, I mean R5+, which is all IP for both signaling and media. Several green field operators are already deploying or have deployed IMS driven networks (we work with many of them), but very few are touting the IMS name around right now, since IMS has been a long used, much abused and somewhat delayed technology. But

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IMS WiMAX interworking – Policy – Part II

Published by in 3gpp, voip, wimax on December 20th, 2006

(click here for Part I) In a previous article, I talked about how IMS, 3G and WiMAX fit together at a conceptual level. As promised, in this article, let’s delve a bit into what it means to interwork IMS and WiMAX. I wanted to get this article out by end this year, so that we have some ‘meat’ to this thread before I forget all about this in 2007. Note: as usual, click on images to make them larger What needs to be interworked ? At a macro level, we know that IMS is a session control layer, while the Wimax forum’s NWG efforts stop at IP-Connectivity. So when we think of interworking, we need to focus on Policy – how will one enforce that network policies such as QoS, admission control, etc. are enforced uniformly ? Security – how does one ensure that a subscriber is authenticated at the WiMAX and at the IMS layer, since they both provide different levels of services ? (for example, a UE may connect to a WiMAX network , but may not be allowed to place a call via IMS due to call barring) Charging – how will one ensure that voice/video/data related

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IMS vs. 3G vs. Wimax – Part I (Basics)

Published by in 3gpp, voip, wimax on December 7th, 2006

Disclaimer: I don’t know if and when there will be a part II, but I have a lot to say in this area, and I get the feeling that a single post will not be enough. So let me at least start the article naming in the right way. As I decide to author followups, I will link each post to the other. Updated Dec 20 2006: Link to part II There is a lot of confusion and misunderstanding in the market today on technologies that could potentially co-exist or replace one another. This article presents my view of how IMS, 3G and WiMax fit into the larger equation. I First, let us talk about these conceptual layers: (You would find most network architectures are based on derivations of these layered principles) Starting from bottom up: Access Layer: Simply put, the Access Stratum involves all the physical characteristics and the mechanisms needed to connect devices with each other. This may be WiMAX radio engineering (802.16, 802.16e etc.), WiFI engineering, UMTS RAN or other technologies. The job of the access stratum is to define and implement the required protocols to be able to physically connect multiple nodes of a network together.

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