Appeal No. 2001-1850 Page 2
Application No. 08/675,893
Network data services of the public telephone network, such as modems and telefax
terminals of class G3, require transfer rates of 14.4 kbit/s. (Id.) Data transfer rates of
at least 64 kbit/s, the appellants add, are needed for Integrated Services Digital
Network services. (Id.)
Striving to increase the data transfer rate of a mobile telecommunications
network, the appellants allocate parallel traffic channels to a single user.
More specifically, their "multi-channel technique" grants a mobile station access to at
least two traffic channels for one call. (Id. at 5.) A high-speed data signal to be
transmitted over a radio path is split into several data signals of lower speed. The
lower-speed signals are then simultaneously transmitted over lower-speed, parallel
channels. After reception, the lower-speed signals are combined to recover the
original, high-speed signal.
Depending on whether two, three, or more traffic channels are assigned to a
user, the appellants assert that "data transfer rate[s] can be doubled, tripled,
etc. . . ." (Id.) In the Pan-European Global System for Mobile Communications system,
for example, they explain that two traffic channels (i.e., time slots) will enable a data
transfer rate of 2×9.6 kbit/s, which is enough for a 14.4 kbit/s modem or telefax
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Last modified: November 3, 2007