Bearer Type Characteristics; Security Using Wap - Sony Ericsson T200 White Paper

The WAP profiles
The T200/T202 holds a number of WAP profiles,
each with a group of network settings and a home
page. If you provide a corporate WAP service on
your Intranet, it is useful to enter an Intranet WAP
profile in user phones. The WAP profile holds net-
work settings and user identification. Users can
switch easily between corporate services and
WAP services on the Internet, simply by switching
WAP profile.

Bearer type characteristics

The phone accesses WAP services over SMS or
IP, where IP can be provided either over GSM
Data or GPRS, depending on network services.
Typical differences which distinguish the bearer
types are listed below.
GPRS access
• Connection is maintained "constantly", as
required by the application, and data is trans-
mitted in packets. This means that the phone
is connected almost all the time without using
network capacity.
• Higher transmission speed than with GSM
Data and SMS access.
• Pricing of GPRS can be dependent on the
actual use of bandwidth, which means very
low cost when no data is sent or received,
while the phone remains connected to the
WAP service.
• When transmitting large amounts of data,
bandwidth can be increased automatically to
allow faster transmission speed.
• GPRS is ideal for Complex Pull services,
Browsing, Data transfer, Provisioning, Pager
service, Messaging services, Info services,
Push initiations.
GSM data access
• Circuit connection of data call, which means
that the phone is connected during the entire
WAP session.
• Comparably higher transmission speed than
with SMS access.
• Pricing of GSM Data access can be com-
pared to pricing of data calls in the network.
• GSM Data is suitable for Complex Pull ser-
vices, Browsing and Data transfer.
• GSM Data is not suitable for Provisioning,
Pager service.
SMS access
• SMS point-to-point is used and not SMS Cell
Broadcast.
• Connection is maintained by the automatic
exchange of "messages" between the phone
and the SMS Service Centre.
• Comparably lower transmission speed than
with GSM Data access.
• Pricing of SMS access can be compared to
pricing of the normal SMS service in the net-
work.
• MS is suitable for Messaging services, Info
services, Push initiations, Provisioning.
• MS is not suitable for Browsing, Data transfer.
The WAP Gateway provides services in the com-
pany's Intranet, a banking or stock trading service
on the Internet, or access to other WAP applica-
tions on web addresses anywhere on the Internet.
A Gateway is identified by an IP number or by a
phone number, depending on access type.

Security using WAP

The T200/T202 supports WAP 1.2.1, a version of
the Wireless Application Protocol that includes
WTLS class 3.
When using certain WAP services,the user may
want more security than normal, for example
when using banking services.The user establishes
a secure connection between the phone and the
WAP gateway.
To use such connections, certificates have to be
saved in the phone.The certificates are made
available so that users can download them from
certain WAP sites. An access key is needed when
accessing certain WAP sites or when reviewing
certificates.The user is asked to enter it before a
secure WAP connection is established.
WTLS class 3 includes the following security fea-
tures:
• Encryption of a message, ensuring that only
the sender and the recipient can read the con-
tents of a message.
• Server authentication, meaning that the mes-
sage is encrypted and users can verify that
they really are communicating with the WAP
gateway they believe they are connected to.
• Client authentication, ensuring that users are
who they claim to be.
T200/T202
White Paper
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