Appeal No. 97-2758 Page 2
Application No. 07/859,962
effectively increasing the cell size of the base station but
does so, unlike conventional systems, without decreasing the
number of available channels.
Claim 18 is reproduced as follows:
18. A method in a cellular radio communication system
having an extended cell range and including at least a fixed
base station and a number of mobile stations, at least one of
said mobile stations being in said extended cell range, said
base station and said mobile stations transmitting and
receiving in corresponding time slots in a transmitting frame
and a receiving frame, respectively where a transmitting frame
is displaced a first standardized time offset relative to a
receiving frame, each including a certain number of time slots
in accordance with a conventional normal transmission mode,
comprising the steps of:
transmitting an access burst from said mobile stations
within a time slot which is extended in accordance with a
conventional extended transmission mode in order to measure a
delay between a remote mobile station at an extended distance
from the base station;
determining from said measured delay whether a call
should be set up in accordance with said conventional normal
transmission mode, said conventional extended transmission
mode or in accordance with an extended transmission mode; and
adding, in said base station to said first standardized
time offset, a second time offset related to said measured
delay, if it is determined that said call should be set up in
said extended transmission mode, wherein the base station
receives bursts from said mobile stations and the mobile
stations receive bursts from the base station while
maintaining the same number of time slots as in said
conventional normal transmission mode.
No references are cited by the examiner.
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