Appeal No. 2001-0656
Application No. 08/976,645
receiving a broadcast message from the primary station because
otherwise the full duplex communications link cannot be realized
between both stations” [answer-page 4].
For their part, appellants agree that Yamashita has no
teaching or suggestion that in response to an extension request
from the primary station, the matched secondary radio station
switches off its transmitter and the further matched secondary
stations ready their receivers for a message. As for Kapanen,
appellants argue that this reference relates to a method and
apparatus for detecting hangover periods in a TDMA wireless
communication system using discontinuous transmission, wherein
hangover periods are detected by the use of flag bits
representing certain characteristics of certain transmitted
frames, such that a number of frame periods is counted until a
certain moment, a beginning of a silence period is detected, and,
based on these factors, a determination is made regarding a
hangover period. Thus, appellants conclude that Kapanen is “very
different than the limitations set forth in claim 1, 6 and 7"
[brief-page 6].
It is appellants’ position that Kapanen does not suggest
that after a communication link has been established an extension
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