Appeal 2007-1415
Application 09/795,704
Mazur further describes another circuit/packet integration
development that integrates a high throughput packet data system with the
TDMA/136 circuit switched mode (Mazur, col. 2, ll. 12-23). Mazur,
however, discusses the tradeoffs associated with this integration, including
the need to allocate substantial bandwidth for GPRS (Mazur, col. 2, ll. 23-
43).
The clear import of this discussion is that integrating cellular packet
switched systems with existing circuit switched systems is seen as a
potential solution to accommodate the tremendous growth of internet users.
In our view, the ordinarily skilled artisan would find ample reason from this
discussion alone to include a module supporting a packet switching protocol
(i.e., a packet stack) along with the modules that support circuit switching
protocols (circuit stacks). At a minimum, such a feature would allow the
mobile phone of Rydbeck to accommodate packet switched protocols in
addition to circuit switched protocols.
We acknowledge that Mazur discusses a problem of being able to run
a stand-alone GPRS system without having to implement a circuit switched
mode (Mazur, col. 2, ll. 9-11). We also recognize that Mazur discusses
introducing synchronization and frequency correction possibilities in a
GPRS system without having to implement a GSM circuit switched mode
and associated control channels as Appellants indicate (Mazur, col. 3, ll. 53-
57).
But these discussions essentially refer to a preferred embodiment of
Mazur. That Mazur may prefer to implement a stand-alone GPRS system
does not foreclose the skilled artisan from considering the reference’s other
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