SRS port configuration for 5G

5G NR
,
1

Hi All,
I have one question related to srs port configuration for 5G:

Possible SRS port configuration is 1, 2 and 4 port.
Based on which condition network decide port configuration?
Is it directly related to Uplink Mimo or some other paramters as well?

2

Hi
Based on your network configuration and you need to check
Alpha SRS = alpha1
P0 nominal SRS = - 80
Parameters available in all NRCELL objects

In LTE part under LNCEL-10/LNCEL_FDD_0
srsActivation = true
srsPwrOffset = 7

3

Brother,
Based on which condition network decide port configuration?
Basically Sounding Reference Signal (SRS) resource sets are configured by the higher layer parameter “SRS-ResourceSet”.

“SRS-Resources” can be configured or set to (BeamManagement/semi-static/semi-persistent/aperodic/periodic) by higher layer parameter SRS called “Resourcetype” and “usage”(‘codebook’ or ‘antennaSwitching’)
This calculation done on NW side based on the UE capability(as an example ‘1T2R’, ‘2T4R’,
‘1T4R’, ‘1T4R/2T4R’, ‘1T=1R’, ‘2T=2R’, or ‘4T=4R’) that is indicating UE supports 1 2 or 4 ports.

Is it directly related to Uplink Mimo or some other paramters as well?
Its depend on how the calculation done on NW side based on the above SRS-Resources configuration with including UL MIMO.
Below is the rrc-reconfig message just for reference. many parameters are there, few major parameters are like resourcetype,usage,P0, resourceId, noofSRS-ports,transmissionComb,offset etc.
srs-Config
SetupRelease : setup
Setup
srs-ResourceSetToAddModList :
[0 ] :
srs-ResourceSetId : 1
srs-ResourceIdList :
[0 ] : 1
resourceType : aperiodic
aperiodicSRS-ResourceTrigger : 1
usage : codebook
p0 : -110
srs-ResourceToAddModList :
[0 ] :
srs-ResourceId : 1
nrofSRS-Ports : port1
transmissionComb : n2
combOffset-n2 : 0
cyclicShift-n2 : 0
startPosition : 0
nrofSymbols : n1
repetitionFactor : n1
freqDomainPosition : 4
freqDomainShift : 0
c-SRS : 0
b-SRS : 0
b-hop : 0
groupOrSequenceHopping : neither
resourceType : aperiodic
sequenceId : 1