A method of assigning radio resources in a cellular system using wired
Relay Stations (RSs) includes: a Base Station (BS) gathering feed-back
control information of all Mobile Stations (MSs) via the RSs in a cell of
the BS; a first process, wherein the MSs are divided into two groups
according to a channel state of each MS; a second process, wherein
sub-channels are dynamically assigned to MSs belonging to a group, in
which a channel state of each MS is good, of the two groups; and a third
process, wherein sub-channels are dynamically assigned to MSs belonging
to a group, in which a channel state of each MS is bad, of the two groups
by considering a resource state per RS and a channel gain between
sub-channels.