Ec/No. 3G, UMTS and WCDMA Technology page from UMTS World. 3G and UMTS Technology Mobile data communications is evolving quickly because of Internet, Intranet, Laptops, PDAs and increased requirements of workforce mobility. 3G UMTS will be the commercial convergence of fixed line telephony, mobile, Internet and 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 computer 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 that would increase frequency usage efficiency. The UMTS transport network is required to handle high data traffic.
3G/UMTS Complete Mobile Originated Circuit Switched Call Setup. 3G UMTS HSPA - High Speed Packet Access Tutorial. - UMTS HSPA, High Speed Packet Access, combines HSDPA and HSUPA for uplink and downlink to provide high speed data access. 3G HSPA, High Speed packet Access is the combination of two technologies, one of the downlink and the other for the uplink that can be built onto the existing 3G UMTS or W-CDMA technology to provide increased data transfer speeds. The original 3G UMTS / W-CDMA standard provided a maximum download speed of 384 kbps. With many users requiring much high data transfer speeds to compete with fixed line broadband services and also to support services that require higher data rates, the need for an increase in the speeds obtainable became necessary. This resulted in the development of the technologies for 3G HSPA. HSPA features The system provides an enhancement on the basic 3G WCDMA / UMTS cellular system, providing data transfer rates that are considerably in excess of those originally envisaged for 3G as well as much greater levels of spectral efficiency. 3G HSPA benefits.
UMTS network planning and ... UMTS is the wireless network technology behind the rollout of Third Generation (3G) mobile telecoms networks which will bring video, music and internet services to the cellphone and a range of electronic products.Chris Braithwaite and Mike Scott use their extensive experience of training engineers across Europe, and their backgrounds in working with Nokia, Ericsson and Orange to deliver a uniquely practical guide written from the perspective of the engineer and network planner.
This guide is a valuable addition to the literature on UMTS which to date has been dominated by theoretical and reference works. The authors consider each of the key topics of UMTS/WCDMA and 3G rollout in terms of Coverage, Capacity and Quality of Service- the key considerations for all engineers and managers working in 3G telecoms. *A real-world design guide with cookbook-style instructions and rules of thumb, not another R&D-level book or crib to the standards. Introduction to 3G mobile communications.
UMTS Link Budget Question & Answer | Wireless Exam. WCDMA Physical Layer: Principles and Features | 3gLteInfo. Wideband Code Division Multiple Access (WCDMA) is the physical layer used for Universal Terrestrial Radio Access (UTRA) FDD mode. The WCDMA technology provides the UMTS system some of the new functionalities on the air interface. The main features provided by WCDMA physical layer are: Spreading and Scrambling Transport Channel Combining Soft Handover Compressed Mode Power Control Scrambling The concept of scrambling was introduced in CDMA systems before it was implemented in WCDMA. Channelisation Code Transmissions from a single source are separated by channelisation codes.
. - In the downlink it can be used to separate different connections from the same sector. - In the uplink it can be used to separate different dedicated physical channels from each other, e.g. separating DPDCH from DPCCH. The spreading and channelisation codes are based on Orthogonal Variable Spreading Factor (OVSF). More about OVSF can be found in the following link: - Measurements;