tag:blogger.com,1999:blog-17500930.post4271853435158285757..comments2024-03-20T22:57:03.923+00:00Comments on Dean Bubley's Disruptive Wireless: Evolved Packet Core in LTEDean Bubleyhttp://www.blogger.com/profile/05719150957239368264noreply@blogger.comBlogger9125tag:blogger.com,1999:blog-17500930.post-62807742027123416502009-05-21T19:21:16.601+01:002009-05-21T19:21:16.601+01:00EPS = EPC + EUTRAN per 3GPP. Though LTE/SAE has s...EPS = EPC + EUTRAN per 3GPP. Though LTE/SAE has stuck on due to historical reasons. SAE was rechristened EPC and LTE as EUTRAN. Together they form EPS or Evolved Packet System.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-17500930.post-79109019423984720092009-05-20T14:55:27.963+01:002009-05-20T14:55:27.963+01:00I believe EPC and SAE are different terms. EPC inc...I believe EPC and SAE are different terms. EPC includes the new functional elements of the MME, SGW, PGW. SAE includes the EPC and the various access networks: 3GPP access (LTE included), non-3GPP trusted access (e.g., CDMA, DSL) and untrusted access (Internet). SAE would include the ePDG for tunnel termination of the untrusted access network.KMitchnoreply@blogger.comtag:blogger.com,1999:blog-17500930.post-22946399611444723172009-05-20T14:23:32.603+01:002009-05-20T14:23:32.603+01:00Also - Zigurd, is there not a case for CDNs to be ...Also - Zigurd, is there not a case for CDNs to be further distributed, eg out towards the edge of the network? For example, at localised RAN backhaul aggregation points, DSLAMs linked to femtos, or even at some of the larger cell sites?Dean Bubleyhttps://www.blogger.com/profile/05719150957239368264noreply@blogger.comtag:blogger.com,1999:blog-17500930.post-59893809348594123142009-05-20T10:22:06.292+01:002009-05-20T10:22:06.292+01:00Thanks for all the comments here - looks like I ne...Thanks for all the comments here - looks like I need to delve a little more deeply into the precise capabilities of EPC.<br /><br />I still think the roaming backhaul vs. offload issue is important - it also makes it more difficult to do clever things like sponsored/"free" LTE access paid by 3rd parties.<br /><br />DeanDean Bubleyhttps://www.blogger.com/profile/05719150957239368264noreply@blogger.comtag:blogger.com,1999:blog-17500930.post-16962773305047413492009-05-20T06:50:40.777+01:002009-05-20T06:50:40.777+01:00Hi Dean,
Home Network: The traffic always HAS to ...Hi Dean,<br /><br />Home Network: The traffic always HAS to go through the Serving-Gateway and the PDN-Gateway to hide the mobility of the user as he roams to the network. It's a basic need of IP. As one of the commenters above, I think it doesn't make much of a difference, the PDN-Gateway is mostly a router like in fixed line networks as well. O.k. you can put applications on the router such as traffic shaping, prepaid charging interfaces, etc. but it's still a router and not so much of a problem.<br /><br />Roaming: Here, the backhauling of the plain Internet access is mostly necessary because of charging, prepaid, etc. But the standards also allow for a local breakout in the visited network. It's just not used. <br /><br />I don't think the cost of backhauling to the home network is so prohibitive that it's impossible to compete with local Wi-Fi, even it's free, because it's usually not where I need it :-)<br /><br />Cheers,<br />MartinMartinhttp://www.wirelessmoves.comnoreply@blogger.comtag:blogger.com,1999:blog-17500930.post-1400257980182123782009-05-19T22:45:42.447+01:002009-05-19T22:45:42.447+01:00In roaming cases, breakout in visited network has ...In roaming cases, breakout in visited network has been in the standards and supported by SGSN/GGSN network elements since the first days of GPRS. However, operators decided to always backhaul to the home network for "business reasons".alexander Essernoreply@blogger.comtag:blogger.com,1999:blog-17500930.post-53689859400326786262009-05-19T19:06:00.000+01:002009-05-19T19:06:00.000+01:00Actually, local breakout is possible - you should ...Actually, local breakout is possible - you should really get some good book on EPC :)Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-17500930.post-8559098270225302602009-05-19T17:49:00.000+01:002009-05-19T17:49:00.000+01:00Back when I was working on GGSNs, I calculated tha...Back when I was working on GGSNs, I calculated that traffic through a metro area's GGSNs would be about the same as through one edge router on a cable or DSL network. Surely it is more now, but not in proportion to the size of fixed-line backbones.<br /><br />It all might add up to a small-enough amount of traffic you would have to come up with a very specific use case - like wanting to get to a CDN - and wouldn't the commercial CDNs be on the mobile core networks anyway?Zigurdhttps://www.blogger.com/profile/05966804881782062088noreply@blogger.comtag:blogger.com,1999:blog-17500930.post-76447363021702516662009-05-19T16:51:00.000+01:002009-05-19T16:51:00.000+01:00Come on Dean, why would any incumbent vendor who p...Come on Dean, why would any incumbent vendor who promotes the LTE vision and sells core equipment want to offer a break-out solution close to the user? There are answers, they just don't come from this crowd.Anonymousnoreply@blogger.com