Number of HARQ processes in LTE/5G in DL/UL

RAN
1

Hi All,
For LTE in UL there are 8 harq process for tm1 and 16 for tm2.
And for LTE in DL there are 8 harq process.
For 5G in UL there are 16 harq process per cell.
And for 5G DL as well 16 harq process number.

Any correction required?
Please check :heavy_check_mark: experts

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1 Like
2

LTE has only max of 8 HARQ process either for DL or UL or regardless of TM.

3

I’ve seen for the Uplink, LTE Advance Carrier Aggregation it is 8 per serving cell (transmission mode 1) and 16 per serving cell (transmission mode 2).

4

Thanks for sharing, I will check UE logs to see.

5

As per my knowledge, LTE has 8 HARQ process for DL or UL.

I never seen process ID >8 in logs .

Could you please share the log snippet where you have seen HARQ process till 16 w.r.t TM mode as well.

Thanks !!!

7

So, is number of harq processes in UL and DL same or not?

8

It is 8 in LTE and 16 in NR.

9

Is that for UL and DL?

10

It’s same in UL and DL.

11

In other releases it may be increased as well.

https://www.3gpp.org/ftp/tsg_ran/WG1_RL1/TSGR1_102-e/Inbox/drafts/8.4.3/R1-200xxxx%20Summary%20of%208.4.3%20on%20HARQ%20for%20NTN_v018_Eutelsat.docx