1.

      3G NETWORKARCHITECTURE3G is the next generation of technology which has revolutionizedthe telecommunication industry. Apart from increasing the speed of communication,the objective of this technology is to provide various value added serviceslike  video calling, live streaming, mobile internet access, IPTV, etc onthe mobile phones. These services are possible because the 3G spectrum providesthe necessary bandwidth.The three basic components are:·        CDMA2000: Code Division Multiple Access·        TD-SCDMA: Time Division Synchronous Code Division Multiple Access·        W-CDMA: Wideband Code Division Multiple Access2.      ADVANTAGES ANDDISADVANTAGES3G (Third Generation Network)Advantages of 3G:        i.           Overcrowding isrelieved in existing systems with radio spectrum.       ii.           There is more ofreliability, security and bandwidth.

      iii.           Providesinteroperability among service providers.      iv.           Availability of fixedand variable rates.       v.           Support to devices withbackward compatibility on existing network.

      vi.           3G uses IP connectivitywhich is packet based.Disadvantages of 3G:        i.           Power consumption ishigh.       ii.           Requires closer basestations and are expensive.      iii.

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           Spectrum license costs,network deployment costs and handset subsidies subscribers are tremendous.      iv.           The cost of cellularinfrastructure, upgrading base station is very high. Wi-Fi (Wireless Fidelity)Advantages of Wi-Fi:        i.           Wi-Fi is a coretechnology in GPS industry application.

       ii.           Frees network devicesfrom cables, allows for a more dynamic network to be grown.      iii.           There are many reliableand bug free Wi-Fi products in the market.      iv.           It helps to become moreproductive at home, like shopping and banking.        v.

           Wi-Fi technology allowsgetting out of home office and working in other rooms.Disadvantages of Wi-Fi:        i.           The 802.11b and 802.11gof Wi-Fi use the 2.4 GHz spectrum, which is crowded with devices such asBluetooth, ovens, cordless phones among other devices.       ii.

           Power consumption isfairly high compared to other standards thus making battery life and heat aconcern.       iii.           Not always configuredproperly by the users.3.      RESULT Thestudy was a comparatively study of the 3G and Wi-Fi and the services which theyprovide.

On various factor Wi-Fi stands better than the other in technicaladvancement, data speed and services.In present day 3G provide best service butin high tariff as compared to others .As the advancement in generation goes thetechnology becomes more complex and band utilization increases. For the WLANmarket, laptop is proving to be one of the most important growth areas for thetechnology.

Wi-Fi is attracting more business customers and corporate outlinesthus creating more revenue.4.      CONCLUSION Thestudy shows 3G provides high rate of data access and some exclusive servicesthat were not provided by previous versions like 3G video calling. The smartphones are more compatible to 3G services as the applications on a smart phonerequire high data speed.  Wi-Fi seems tobe a very promising generation of wireless communication that will change thepeople’s life to wireless world.

There are many striking attractive featuresproposed for Wi-Fi which ensures a very high data rate, global roamingetc.  As Wi-Fi is now shipped in millionsof products and deployed in millions of households and corporate world,thetechnology has moved beyond the realm of a computer feature. Wi-Fi has become acultural phenomenon.