RBS load

The RBS load is defined as the percentage of available RBS power that is used.

The overall assumption for HSDPA dimensioning is that the RBS load is 100%, i.e. all cells are transmitting with full power all the time.

Cell capacity

Cell capacity is defined as the cell throughput in an individual cell.

In a network with inhomogeneous traffic distribution and non-hexagonal cells, the cell capacity may vary depending on amount of traffic in own and other cells and
inter-cell interference.

Cell border throughput

The cell border throughput is defined as the bit-rate a single HSDPA user would get when standing in the cell border area. The cell border throughput is obtained
for the case when only one user is active in the cell.

The cell average throughput is defined as the average expected bit-rate for one
cell. The average is taken for a whole cluster of cells, where the subscribers are
evenly spread over the cell area.
It is possible to take advantage of scheduling gain since there are many users in
the cell. The cell average throughput is the shared throughput for all HSDPA
users that are in the cell. The individual user throughput depends mainly on how
many other users that are connected to the same cell.

Fully up-to-date coverage of the inner-workings of 3G

This revised and updated edition of 3G Wireless Networks covers the changes taking place within the arena of 3G--the wireless technology that enables voice, full-featured video, CD-quality sound, and Web browsing anywhere in the world. The book covers key standards and protocols and the critical issues of compatibility, internetworking, and voice/data convergence. You will learn how to successfully design and integrate WCDMA/UMTS, CDMA2000, and SCDMA into existing cellular/PCS networks.

This IDC study examines the HSDPA evolution of the WCDMA/UMTS standard, specifically its effects on mobile device and semiconductor vendors.

"Carriers in certain regions, including Japan and Western Europe, plan to roll out HSDPA services in 2005. IDC's analysis shows that these rollouts are supply based, in that carriers are rolling out HSDPA because they can, and to keep up with competitive carriers, but that demand models are not yet there. Mobile device and especially semiconductor vendors, however, must be prepared to support HSDPA by 2006 at the latest to remain competitive." — Allen Leibovitch, program manager, IDC's Semiconductors program

High-Speed Downlink Packet Access (HSDPA) (Sometimes known as High-Speed Downlink Protocol Access) is a 3G mobile telephony protocol in the HSPA family, which provides a roadmap for UMTS-based networks to increase their data transfer speeds and capacity. Current HSDPA deployments now support 1.8 Mbit/s, 3.6 Mbit/s, 7.2 Mbit/s and 14.4 Mbit/s in downlink.

Further speed grades are planned for the near future. The networks are then to be upgraded to HSPA Evolved, which provides speeds of 42 Mbit downlink in its first release.[1]

In addition to supporting high data speeds, HSDPA greatly increases the capacity of the network. Current HSDPA networks have the capacity to provide each customer with 30 gigabytes of data per month in addition to 1000 minutes of voice and 300 minutes of mobile TV

3GPP - Third Generation Partnership Project
BTS - Base Station
DCH - Dedicated Channel (transport channel)
HS-DSCH High Speed Downlink Shared Channel
HSDPA High Speed Downlink Packet Access
HW Hardware
IP Internet Protocol
MS Mobile Station
PS Packet Switched
QoS Quality of Service
RAN Radio Access Network
RNC Radio Network Controller
SW Software
WCDMA Wideband Code Division Multiple Access

The volume of IP-based traffic has already exceeded that for circuitswitched traffi c in most fixed networks. The same change will happen in mobile networks as new IP-based mobile services become available and are used by more people in their daily communications.
Current estimates show that, in advanced mobile communication markets, packet-switched traffi c will overtake circuit-switched traffic in the near future. Delivery of digital content over mobile networks as well as IP-based person-to-person communication that combines
different media and services into a single session, will generate additional traffi c and revenue. The growth in data bits used in communications will exceed the growth in revenue, driving
operators to optimize their networks to support the dominant traffic type.

HSDPA, High Speed Downlink Packet Access, offers breakthrough data speeds – up to five times (10 Mbps) higher than is possible in the most advanced 3G networks – as well as
two-fold base station capacity. For end-users this means shorter service response times and less delay.

Meanwhile, operators will be able to offer advanced services at lower costs and with increased profitability. As the Nokia HSDPA solution is fully backwards compatible with current
Nokia WCDMA networks, it is a costeffective way to upgrade existing infrastructure. By providing higher quality and capacity it will help to drive up the consumption of dataintensive
services, bringing operators more revenue. HSDPA offers by far the highest performance at the lowest cost, enabling real mass-market mobile IP multimedia. HSDPA is based on WCDMA evolution, standardized as part of 3GPP Release 5 WCDMA specifi cations. The new
modulation method of HSDPA greatly improves the peak data rate and throughput, which enhances spectral effi ciency. In addition to these benefits, users will perceive faster connections
to services through shorter round trip times.

As a result of these enhancements, operators using HSDPA will be able to support considerably higher numbers of high data rate users on a single radio carrier than is possible with any
existing 3G technology.

The WCDMA air interface has been standardized by the 3rd Generation Partnership Project (3GPP) as a radio transport medium for global mobile communication systems. Consequently, the fi rst versions of the 3GPP air interface specifications enabled superior user data rates and
system throughput capacities compared to any 2nd generation mobile communication standard.

The WCDMA system’s adaptability enables a new and significant evolutionary step in packet data
access: the HSDPA Solution. HSDPA is standardized in 3GPP
Release 5.