ALL ABOUT 3G MOBILE TECHNOLOGY

5. Radio Access

Wide band CDMA technology was selected to for UTRAN air interface. UMTS WCDMA is a Direct Sequence CDMA system where user data is multiplied with quasi-random bits derived from WCDMA Spreading codes. In UMTS, in addition to channelisation, Codes are used for synchronisation and scrambling. WCDMA has two basic modes of operation: Frequency Division Duplex (FDD) and Time Division Duplex (TDD). UTRAN interfaces are shown on UMTS Network page.

The functions of Node-B are:

Air interface Transmission / Reception

Modulation / Demodulation

CDMA Physical Channel coding

Micro Diversity

Error Handing

Closed loop power control

The functions of RNC are:

Radio Resource Control

Admission Control

Channel Allocation

Power Control Settings

Handover Control

Macro Diversity

Ciphering

Segmentation / Reassembly

Broadcast Signalling

Open Loop Power Control

6. User Equipment

The UMTS standard does not restrict the functionality of the User Equipment in any way. Terminals work as an air interface counter part for Node-B and have many different types of identities. Most of these UMTS identity types are taken directly from GSM specifications.

International Mobile Subscriber Identity (IMSI)

Temporary Mobile Subscriber Identity (TMSI)

Packet Temporary Mobile Subscriber Identity (P-TMSI)

Temporary Logical Link Identity (TLLI)

Mobile station ISDN (MSISDN)

International Mobile Station Equipment Identity (IMEI)

International Mobile Station Equipment Identity and Software Number (IMEISV)

UMTS mobile station can operate in one of three modes of operation:

PS/CS mode of operation: The MS is attached to both the PS domain and CS domain, and the MS is capable of simultaneously operating PS services and CS services.

PS mode of operation: The MS is attached to the PS domain only and may only operate services of the PS domain. However, this does not prevent CS-like services to be offered over the PS domain (like VoIP).

CS mode of operation: The MS is attached to the CS domain only and may only operate services of the CS domain.

UMTS IC card has same physical characteristics as GSM SIM card. It has several functions:

Support of one User Service Identity Module (USIM) application (optionally more that one)

Support of one or more user profile on the USIM

Update USIM specific information over the air

Security functions

User authentication

Optional inclusion of payment methods

Optional secure downloading of new applications

YOU WILL FIND DIFFERENT EMAIL ADDRESS LIST EVERY WEEK

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