Thanks you all!
Now, let’s say my PDCCH duration = 3 symbols, so in that case I can set monitoring symbols within slot like 11100000000000 or 00011100000000.
Will it work?
As per this definition, if you want to configure PDCCH as first 3 symbols of the slot, then you need to provide duration in CORESET as 3 and the bitmap for monitoringSymbolsInSlot in searchSpace IE should be 10000000000000.
In this case your monitoring symbol within slot will be like 10000000000000 if you want to start pdcch Monitoring from first symbol.
UE will monitor first 3 consecutive symbol if CORESET duration is 3.
So it’s not like we need to set 3 bits enabled i.e. 11100000000000?
No, it is not.
You can make like this:
10000001000000
In this case in one slot 2 times you can configure PDCCH monitoring (first will start from symb 0 to 2 and second will be symb 7 to 9, in case you have duration = 3).
Thanks it’s clear with link shared by you. 
Excellent explanation!
‘Duration’ within the CORESET congratulation indicates the number of PDCCH symbols.
‘monitoringSymbolsWithinSlot’ within SearchSpace configuration indicates the starting position of the PDCCH symbol.
Are you sure this is correct?
Duration - number symbols PDCCH can occupy consecutively.
monitoring symbols are for particular search space within PDCCH duration.
So it has to be consecutive.
With duration = 3
We can also have monitoring symbols like 11000000000000
This implies that there are 2 search spaces.
With duration = 3 you can’t configure like 11000000000000 because it is indicating the monitoring symbols within search space.
So if 1st symbol is one so from there it will count 3 (duration = 3).
So if you want to configure 2 symbols then it should be like this:
10010000000000
In this case you have 6 consecutive symbols to monitor.
If we configure the way you said, then total PDCCH are 6 symbol.
Which is not correct.
It’s not 6 symbols of PDCCH.
It means 2 PDCCH monitoring occasions in a slot, with symbol indices 0 and 3 as first symbol indices for the two monitoring occasions.
For both the monitoring occasions, the UE will monitor only for the number of symbols specified by the parameter duration.
So, in this case, the UE will monitor for PDCCH at symbol index 0 and symbol index 3 and each of these monitoring occasions will have 3 symbols as PDCCH allocation.
First of all there are two ‘duration’ parameters, one within the CORESET configuration and other one within SearchSpace configuration.
The first one represents the no of consecutive PDCCH symbols whereas the 2nd one indicates the PDCCH monitoring occasion.
The 2nd one is the optional parameter and only required when the no of PDCCH monitoring occasion is greater than 1 within a slot.
Yes correct.
And here we are talking about duration of CORESET.
If we configure it as 3,then in that slot PDCCH cannot occupy more than 3 symbols.
Lets have example:
- CORESET duration 3
- Searchspace duration is mostly set to 1 unless channel BW is very small
- And monitoring symbol set as 11000000000000
So first searchspace is for first symbol, and search space is for 2nd symbol, third symbol is not used for PDCCH and will be used by PDSCH.
And with CORESET duration = 3 we cannot set 10010000000000
I think to link with multiple no of search spaces to one CORESET is normally implemented by giving different periodicity and offset using the parameter ‘monitoring Slot periodicity and offset’
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Yes true.
But one slot can have multiple search spaces.
Yes… I saw one implementation log in which Paging and RACH search spaces share the same slot (same Search Space ID).
They had 48 RBs i.e. 8 CCEs and 2 candidates for Aggregation level 4.
Monitoring symbols within Slot was ‘10000000000000’
We have 2 duration parameter, one for CORESET indicates no of symbol occupied by pdcch and other duration in search space related to symbols for search space.
Search space duration indicates slot periodicity:
Tried to set 11000000000000 but showing invalid config with search space duration 4, monitoring offset to 2,control resource duration set to 3, monitoring slot periodicity 10, SCS 30 kHz.
Small correction:
Duration in CORESET - Number of PDCCH symbols in CORESET.
Duration in searchspace configuration - number of consecutive slots which search space occupies.