Evolving 3G Mobile Systems: Broadband and Broadcast
Services in WCDMA
The third-generation WCDMA standard
has been enhanced to offer significantly increased performance for
packet data and broadcast services through the introduction of
high-speed downlink packet access (HSDPA), enhanced uplink, and
multimedia broadcast multicast services (MBMS). The authors provide
an overview of the key technologies used, the reasons behind their
selection, and their integration into WCDMA.
Stefan Parkvall,
Eva Englund, Magnus Lundevall, and Johan Torsner, Ericsson
Research
CDMA2000 1xEV-DO Revision A: A Physical Layer and MAC
Layer Overview
This article presents key enhancements
to CDMA2000 1xEV-DO systems embodied in 1xEV-DO Revision A. These
enhancements provide significant gains in spectral efficiency and
substantial improvements in QoS support relative to 1xEV-DO
Revision 0.
Naga Bhushan, Chris Lott, Peter Black, Rashid Attar, Yu-Cheun
Jou, Mingxi Fan, Donna Ghosh, and Jean Au, QUALCOMM, Inc.
VoIP over cdma2000 1xEV-DO Revision A
The
authors analyze performance of VoIP services over 1xEVDO-Revision A
(DO-Rev A) networks and show that high-quality VoIP with
unconstrained mobility and high capacity can be achieved. Together
with quality of service (QoS) requirements, we emphasize practical
issues such as mobility, degradation of feedback-channel quality,
and packet overheads.
Mehmet Yavuz, Serafin Diaz, Rohit
Kapoor, Matt Grob, Peter Black, Yeliz Tokgoz, and Chris Lott,
QUALCOMM Inc.
Implementing Interference Cancellation to Increase
the EV-DO Rev A Reverse Link Capacity
The authors
discuss how interference cancellation can be implemented on the
EV-DO Rev A reverse link. It is shown that applying interference
cancellation to CDMA achieves the multiple access channel sum rate
capacity for either frame synchronous or asynchronous
users.
Jilei Hou, John E. Smee, Henry D. Pfister, and Stefano
Tomasin, QUALCOMM Inc.
Macro-Mobility Management in EVDO
The
authors describe the design and best practices for macromobility
management in EV-DO, including mobility across EV-DO subnets and
mobility across network that support different air interface
technology (i.e., between 1x and EV-DO, or between different
revisions of EV-DO).
Ramin Rezaiifar, Parag Agashe,
and Paul Bender
Running Cellular/PWLAN Services: Practical
Considerations for Cellular/PWLAN Architecture Supporting
Interoperator Roaming
To offer wireless data access
services that are more efficient than GPRS or UMTS networks, public
WLANs are in a predominant position to embrace the wireless
broadband era. Reusing the existing mechanisms for user
authentication, access control, billing, and roaming handling
procedures in mobile territory to construct a complementary
network, public WLAN (PWLAN) has drawn the attention of cellular
operators.
Jenq-Shiou Leu, National Tsing Hua University;
Rong-Horng Lai, MOBITAI Communications ; Hsin-I Lin, Taiwan
Cellular Corporation ; Wei-Kuan Shih, National Tsing Hua
University
Integrated Services from High-Altitude Platforms: A
Flexible Communication System
The authors discuss the
provision of integrated services from high-altitude platforms
(HAPs), and a flexible communication system for HAP-based
communications is identified and analyzed, with particular
attention to the delivery of broadband services from HAPs to
high-speed trains.
Emanuela Falletti, Massimiliano Laddomada,
Marina Mondin,
and Fabrizio Sellone, Politecnico di Torino
Ethernet as Carrier Transport Infrastructure
New innovations in the Ethernet space promise to
significantly enhance both the scalability and capability of
Ethernet as a networking technology. The authors outline how the
convergence of hierarchy, OAM functionality, and enhanced
forwarding capability combine to permit Ethernet to assume a much
larger role in carrier networks with substantial economic and
operational benefits.
David Allan and Nigel Bragg, Nortel;
Alan McGuire and Andy Reid, BT
