Appeal No. 2002-2106
Application 09/313,359
Invention
The invention relates to a mobile cellular
communications system which contains a number of base stations
which communicate with mobile stations. See page 1 of
Appellants’ specification. The invention addresses the problem
where two base stations communicate simultaneously with the
same mobile station. The power transmitted by the base stations
must be adapted as quickly as possible to changes in channel
characteristics. The mobile station sends to all base stations
serving it a transmit power control command instructing them to
change their transmitted powers, namely to raise or lower the
transmitted power level by a predetermined amount. See pages 1
and 2 of Appellants’ specification. The invention is predicated
on the recognition of the following problem which arises if the
transmit power control command is detected in error. If one of
the base stations receives the transmit power command
incorrectly, it will change its transmitted power incorrectly as
compared with those base stations which receive the transmit
power command correctly. Accordingly, the transmitted power
levels will drift apart, which is called “random walk.” To
prevent this drift, the invention proposes to preset for each
2
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