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Why can we have only 8 simultaneously harq process in the uplink? [CLOSED]

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Why can we have only 8 simultaneously harq process in the uplink.
Is it applicable to downlink as well.

closed with the note: The answer has been given in comment.
posted Jan 22, 2014 by anonymous

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It is not uplink, 8 HARQ processes are in downlink. I suggest you to read the below link:
http://www.sharetechnote.com/html/BasicProcedure_LTE_HARQ.html
4 ms (propagation + processing) to get the ACK for a transmission. 4 ms (propagation + processing ) to send either retransmission or new data. since tti is 1ms one harq ID is occupied for 8 ms , hence need 8 harqs before a harq ID can be reused.

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