Internet of Things for Architects by Perry Lea

Author:Perry Lea
Language: eng
Format: mobi
Tags: COM088000 - COMPUTERS / System Administration / General, COM011000 - COMPUTERS / Systems Architecture / General, COM091000 - COMPUTERS / Cloud Computing
Publisher: Packt
Published: 2018-01-22T08:31:34+00:00

Public Data Network (PDN): This is the external interface, and for the most part, the internet. It can include other services, data centers, private services, and so on.

In a 4G-LTE service, a customer will have a carrier or operator known as their Public Land Mobile Network (PLMN). If the user is in that carrier's PLMN, he or she is said to be in Home-PLMN. If the user moves to a different PLMN outside their home network (for example, during international travel) then the new network is called the visited-PLMN. The user will connect their EU to a visited-PLMN which requires resources of the E-UTRAN, MME, SGW, and PGW on the new network. The PGW can grant access to a local-breakout (a gateway) to the internet. This, effectively, is where roaming charges start to affect the service plans. Roaming charges are applied by the visited-PLMN and accounted for on the client's bill. Below is a graphic illustrating this architecture. On the left side is a top-level view of the 3GPP System Architecture Evolution for 4G-LTE. In this case, it represents the client UE, the radio node E-UTRAN, and the core network EPC, all residing in a Home-PLMN. On the right is a model of the mobile client moving to a visited-PLMN and distributing the functionality between the visited-PLMN E-UTRAN and EPC, as well as crossing back to the home network. The S5 interconnect is used if the client and carrier reside on the same network and the S8 interface if the client is crossing across different networks.

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