Mobile data communications is evolving quickly because of Internet, Intranet
, Laptops, PDAs and increased requirements of workforce mobility. 3G UMTS wi
ll be the commercial convergence of fixed line telephony, mobile, Internet a
nd computer technology. New technologies are required to deliver high speed
location and mobile terminal specific content to users. The emergence of new
technologies thus provides an opportunity for a similar boom what the compu
ter industry had in 1980s, and Internet and wireless voice had in 1990s.
The main IMT-2000 standardisation effort was to create a new air interface t
hat would increase frequency usage efficiency. The WCDMA air interface was s
elected for paired frequency bands (FDD operation) and TDCDMA (TDD operation
) for unpaired spectrum. 3G CDMA2000 standard was created to support IS-95 e
volution.
The UMTS transport network is required to handle high data traffic. A number
of factors were considered when selecting a transport protocol: bandwidth e
fficiency, quality of service, standardisation stability, speech delay sensi
tivity and the permitted maximum number of concurrent users. In the UMTS net
work, ATM (Asynchronous Transfer Mode) is defined for the connection between
UTRAN and the core network and may also be used within the core network. In
addition to the IMT-2000 frame many new standards will be integrated as par
t of the next generation mobile systems. Bluetooth and other close range com
munication protocols and several different operating systems will be used in
mobiles. Internet will come to mobiles with WAP, i-mode and XML protocols.
3G development has helped to start the standardisation and development of la
rge family of technologies.
This section covers some of the core UMTS technologies and it will be update
d regularly.
3G Network Planning Basics
1. Planning 5. Radio Access Network Design
2. Coverage Planning 6. Core Network Design
3. Capacity Planning 7. Transmission Design
4. General Guidelines 8. The Summary
发表于 2004-12-2 23:42:00
