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COVER STORY
12
UMA TodAY
FALL 2007
access controls, handover, regulatory compliance, as well
as scalability to support millions of endpoints."
Initiating a new "Iu over IP" standardization effort
within 3GPP would significantly delay the time-to-
market for femtocell devices and infrastructure, causing
fragmentation in the femtocell eco-system. As an existing,
commercially deployed technology, UMA provides a
natural rallying point for a common femtocell network
integration standard.
As it already meets the vast majority of unique
challenges for delivering a commercial femtocell service,
UMA has more than a three year head start over vendor-
specific standardization efforts.
UMA: Addresses The ChAllenges
oF Mobile serviCe deliverY over
ip
Delivering mobile services over the internet and into
subscriber homes presents a unique set of challenges for
operators. While defining a method for transporting Iu
traffic over the public internet is an important first step,
there are many more additional requirements for a device-
to-core network connectivity interface to be sufficiently
robust to support large-scale commercial femtocell
deployments.
IP Security:
As mobile signaling and bearer traffic is
carried over the public internet, it is imperative a femtocell
device-to-core network connectivity interface secure the
traffic.
Discovery and Registration:
As a consumer electronics
device, a femtocell must be able to be mass-produced
and "plug and play" installed. Therefore, a thoughtful
and scalable procedure is required be in place to enable a
femtocell to power on and begin delivering services with
minimal network provisioning overhead. Upon femtocell
powering, a procedure must be defined for the femtocell
to identify its relative global location, determine the
appropriate RAN Gateway to which it should associate,
determine if the femtocell is allowed to offer service in its
current location, as well as register the femtocell with the
RAN Gateway in order to begin offering local coverage.
Authentication:
Once a femtocell registers with a RAN
Gateway, it must be authenticated as a valid device in
order to prevent service fraud.
Authorization:
Once a femtocell is authenticated,
it must be authorized to provide service. In addition,
individual handsets that come within range of a femtocell
must also be authorized to access mobile service via the
femtocell.
Quality of Service (QoS):
As a subscriber's mobile traffic
will be transported over the internet, the femtocell device-
to-core network interface must include QoS mechanisms
to provide the best possible end user service experience.
Regulatory Compliance:
Complying with regulatory
requirements, such as emergency calling, is not optional
for operators looking to deploy a femtocell service. The
The femtocell
industry is starting to
appreciate the three
year head start UMA
has over proprietary
approaches being
proposed for device-
to-core network
connectivity.
Patrick Tao,
vice president of technology,
Kineto Wireless