Notes on Digital Communication Principles (III)-regions and Identification Numbers

 Notes on Digital Communication Principles (iii) --- area and identification number

I. Region

InGSMRegion definition in the structure of the system's mobile communication network:

1.Service Area

A service area refers to a region where a mobile station can obtain services, that is, different communication networks (suchPlmn,PSTNOrISDN) The area in which the user can communicate with the mobile station without knowing the actual location of the mobile station. A service area can be composed of one or more public land mobile communication networks (PlmnCan be a country, a part of a country, or a number of countries.

2.Public Land Mobile Communication Network (Plmn)

PlmnIs composed of a Public Land Mobile Communication Network (Plmn) Provides the geographic area of the Communication Service.PlmnCan be considered as a network (suchISDNNetwork orPSTNNetwork),PlmnA zone can be composed of one or more mobile business exchange centers (MSC. The region has a common numbering system (such as the same domestic region number) and a common routing plan.MSCBuild a fixed network andPlmnFunction interfaces for call connection.

3.MSCZone

MSCIt is a region that is jointly covered by all cells controlled by a mobile business exchange center.PlmnNetwork. OneMSCA zone may consist of one or more location zones.

4.Location Area

Location Area refers to the area where the mobile station can be moved without any location update. A location area can be composed of one or more cells (or base station areas. To call a mobile station, all base stations in a single location area can send paging signals at the same time.

5.Base station area

From one or more base stations at the same base station (BTS.

6.Residential Area

The wireless coverage area identified by the base station identification code or the global community identification. When an omnidirectional antenna is used, the residential area is the base station area.

Ii. Mobile identification number

1. imsi (International Mobile Subscriber Identity):

ImsiYesGSMSystem assigned to mobile usersMS)The unique identification number, which is valid in all locations, including the roaming area. TakeE.212Encoding method. Stored inSimCard,HLRAndVlrIn the wireless interface andMapInterface.

2. tmsi (temporary mobile subscriber identity):

TmsiIn order to enhance the confidentiality of the systemVlrTemporary user identification allocated in

VlrWithin the region andImsiUnique.

3. LMSI (Local Mobile Subscriber Identity):

LMSITo speed upVlrThe query speed of user data depends onVlrWhen the location is updated

AndImsiSendHLRSave,HLRIt will not be processed, but will

IncludeImsiMessages sentVlr.

LMSIThe length is four bytes and there is no specific allocation principle requirement. Its structure is determined by

Yes.

4. msisdn (mobile subscriber International ISDN/PSTN number):

MsisdnIndicates that the caller is a call.GSM plmnThe number that a mobile user needs to dial,

Function equivalent to fixed networkPSTNNumber

TakeE.164Encoding Method

Stored inHLRAndVlrInMapTransfer on Interface

Composition:

CC:Country CodeCountry code, such as China86.

NDC:National destination code, Domestic access number, such as China Mobile'sNDCCurrently

139,138,137,136,135.

Sn:Subscriber number

MsisdnThe general format is86-139 (Or8-0)-H1 H2 H3 ABCD

TypicalMsisdnExample:861394770001

SendroutinginfoAndSendimsiBoth useMsisdnAddressable

In China, the mobile user number is upgraded11Bit, inH1h2h3AH0(0 ~ 9),

The general format is changed86 to 139(Or8-0)-H0h1h2h3abcd, Typical number example:

8613904770001

5. MSC-number (MSCNumber)/Vlr-number (vlrNumber)

TakeE.164Encoding Method

The encoding format is

CC + NDC + LSP

WhereCC,NDCSame meaningMsisdn,LSP (lacally significant part)Operated

By yourself.

TypicalMSC-NumberIs86-139-0477

6. Roaming-number (Roaming number)AndHandover-number (Switch number)

Roaming-NumberAbbreviationMsrn,Handover-NumberAbbreviationHon

Temporary allocation during the move called or switch process, usedGmscAddressingVmscOrMSCAAddressing

MscbUsed. It is released immediately after the connection is complete. It is invisible to users.

TakeE.164Encoding Method

7.HLR-number (HLRNumber)

TakeE.164Encoding Method

The encoding format is

CC + NDC + H1 HH2 H3 0000; Changed:CC + NDC + h0h1h2h3000

WhereCC,NDCSame meaningMsisdn.

TypicalHLR-NumberIs86-139-4770000; After upgrading861390477000

UseImsiAddressing operations can be convertedHLR-NumberAddressing

8.Bsic(Base station identification color code)

It is used by mobile stations to identify adjacent base station receiving and sending stations with the same carrier frequency (BTS), Special

Do not distinguish adjacent regions with the same carrier frequency in different countries.BTS.BsicFor6

Bit Encoding

9. IMEI(International mobile device identification code)

IMEIUniquely identifies a mobile device for monitoring stolen or invalid mobile devices.

Composition:

ØTac ----Model approval code, which is allocated by the European model approval center.

ØFAC ----The final assembly code indicates the manufacturer or the last Assembly location, which is encoded by the manufacturer.

ØSNR ----Sequential number. The independent sequential number of this number uniquely identifies eachTacAndFACOf

ØEach mobile device.

ØSP -------Backup.