The WCDMA framework is a piece of the UMTS. It is created by the 3G Partnership Program, which is made out of advanced center cell arranges that have a place with the Global System for Mobile (GSM) interchanges systems around the world. 

WCDMA highlights two modes: 

Recurrence Division Duplex (FDD): Separates clients by utilizing the two codes just as frequencies. One recurrence is utilized for the uplink, while another is utilized for the downlink.
Time Division Duplex (TDD): Separates clients by utilizing codes, frequencies and time, wherein a similar recurrence is utilized for both uplink and downlink. 

In spite of the fact that WCDMA is intended to work on advanced GSM center systems, it utilizes code division various access (CDMA) for its air interface. Actually, most of the 3G frameworks in activity utilize CDMA, while the rest use time division different access (TDMA). The TDD method of WCDMA really utilizes a blend of TDMA and CDMA. 

CDMA permits numerous clients to share a channel simultaneously, while TDMA permits clients to have a similar channel by hacking it into various time allotments. CDMA offers the advantages of multipath decent variety and delicate handoffs.

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