GSM network architecture of wireless communication network

Learn about GSM's overall network architecture today.

Before understanding the GSM network architecture, let's take a look at its system composition:

MS: Mobile user or Mobile station, ≈td/lte inside the UE

BSS: Base station subsystem, containing BTS,BSC; a part of the enodeb of Nodeb≈lte in BTS≈TD; BSC≈TD Rnc≈lte;

SS: Switching subsystem: MSC,VLR,HLR,AUC,EIR, these functions within each system are equivalent;

OMC: operation and maintenance subsystem;

After understanding the above basic network elements, let's look at the following diagram, first to understand its approximate structure:

We can clearly see the position of each network element in the system.

Let's look at a little bit about what protocols are in the GSM system for which some network elements work:

First , the MS Wireless air interface UM gives users the ability to access the network business, divided into mobile devices (EQUIPMENT,ME) and user identification module (Subscriber identity Module,sim) two parts;

There are three parts in BSS, missing a converter (TRANSCODER,XCDR), and BSS is connected to MSC via encoder.

The network switching system consists of the Mobile Service Exchange Center (MSC), the Access location Register (VLR), the Attribution position Register (HLR), the Authentication Center (AUC), the Mobile Device Identification Register (EIR), the interworking function (IWF), and the Echo Canceller (EC).

Here is the focus on HLR and VLR, because these two network element module consistent troubled me for a long time!

1.HLR(Home location Register) The attribution register is a database that stores local user information, and a HLR can control several mobile swap areas. In the GSM system will be set up several HLR, each user needs to register on a corresponding HLR, equivalent to We can understand that we put our account in the only one police station inside, can not put the account colleagues in two police stations.

There are two kinds of contents recorded in HLR: one is fixed information, such as user number, mobile device number, access priority level, predetermined business type and confidentiality parameters, etc., the second is the parameter that the temporary need to update at any time, that is, the parameter that the user is in position at present, Even if the user roams to the area served by HLR, HLR also registers the location information sent by the zone, so that the user's HLR can be used to establish the communication link when the call is made to any mobile user who is not aware of the area.

2.VLR (Visit Location register) access to the position register is a database that stores information about visitors. A VLR is usually controlled by an MSc. When the user roams to the new MSC, it is necessary to apply for registration with the VLR of the zone, and then VLR from the user's HLR query related parameters, assign a new roaming number (MSRN), and notify it HLR modify the user's location information so that other users can call the user to have routing information. in summary, VLR is similar to a dynamic database.

VLR stores information such as: Mobile station status (Busy/idle/no answer, etc.), location area identification Number (LAI), temporary Mobile user identification number (TMSI), and Mobile station roaming code (MSRN).

OK, probably introduced here, after the new dry goods and then slowly updated to add.

At this point, the Gsm,td,lte network architecture is a simple introduction, I believe that the whole network is now the embryonic prototype has been in your mind has a certain impression. Then find a time, write about the three kinds of network architecture comparison, hope that through comparative study, we can have a deeper understanding of the architecture of wireless communication network.

The above content such as discrepancy, welcome the general friend pointing treatise. Thank you!

GSM network architecture of wireless communication network