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[STDS-802-16] Inconsistency between sections 6.3.17.1 and 6.3.17.2



In 6.3.17.1 of 802.16e/D12, last paragraph, it says ACK is sent by BS after a fixed delay.

In 6.3.17.2 of Cor1/D5, it says the ACK/NAK messages for uplink HARQ may be omitted.

Can they both be correct?

(BTW, what is "is" in the IEEE spec? Does "is sent" = "shall be sent"?)