请教WiMAX中的segment是什么？

12-12

rt，WiMAX中的segment是怎么定义的，查遍了WiMAX也没找到

Segment
A segment is a set of OFDMA subchannel groups.There are up to three segments
for the downlink and three for the uplink.
Subchannel group
1 or more subchannel in the Downlink PUSC zone are grouped to a subchannel
group.There are 6 subchannel groups

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