number of PRBs for PUCCH exceeds the 50% of the BWP PRBs

[seoyuloh]

Issue Description

I am using two x310 USRPs to follow this tutorial. (https://docs.srsran.com/projects/project/en/latest/tutorials/source/srsUE/source/index.html)

This gnb.yml file worked fine when I was using before this Commit ef983b6, now I changed my srsRAN_Project to the newest commit and I updated my yml file accordingly. However even when I changed the coreset0_index to 0, it is giving me this error, "number of PRBs for PUCCH exceeds the 50% of the BWP PRBs".

When I change coreset0_index to 1 or above, I get this message, "Unable to derive a valid SSB pointA and k_SSB for CORESET#0 index=1, SearchSpace#0 index=0 and cell bandwidth=5MHz"

My computer's computing power is not good so if I go up to 10MHz I see too many overflows, this is why I want to use 5MHz.

What should I do?

Setup Details
Two USRP X310s
Ubuntu 22.04
I am using the open5gs docker inside the project as instructed.
I have attached my configuration files both for UE and gNB.

<<gnb.yml>>
cu_cp:
amf:
addr: 10.53.1.2
port: 38412
bind_addr: 10.53.1.1
supported_tracking_areas:
- tac: 7
plmn_list:
- plmn: "00101"
tai_slice_support_list:
- sst: 1
inactivity_timer: 7200

ru_sdr:
device_driver: uhd
device_args: type=x300,addr=192.168.10.2,num_recv_frames=512,num_send_frames=512,send_frame_size=1472,recv_frame_size=1472,recv_buff_size=52428800,send_buff_size=52428800, recv_buff_size=52428800
clock: internal
srate: 7.68
tx_gain: 20
rx_gain: 25

cell_cfg:
dl_arfcn: 368500
band: 3
channel_bandwidth_MHz: 5
common_scs: 15
plmn: "00101"
tac: 7
pdcch:
dedicated:
ss2_type: common
dci_format_0_1_and_1_1: false
common:
ss0_index: 0
coreset0_index: 0
prach:
prach_config_index: 1

log:
filename: /home/tmp/gnb.log
all_level: debug

pcap:
mac_enable: enable
mac_filename: /tmp/gnb_mac.pcap
ngap_enable: enable
ngap_filename: /tmp/gnb_ngap.pcap

<<ue_rf.conf>>
[rf]
freq_offset = 0
tx_gain = 40
rx_gain = 60
srate = 7.68e6
nof_antennas = 1

device_name = uhd
device_args = type=x300, addr=192.168.10.4,master_clock_rate=184.32e6,num_recv_frames=512,num_send_frames=512,send_frame_size=1472, recv_frame_size=1472,clock=internal,sync=internal,recv_buff_size=52428800, send_buff_size=52428800
time_adv_nsamples = 100

[rat.eutra]
dl_earfcn = 2850
nof_carriers = 0

[rat.nr]
bands = 3
nof_carriers = 1
max_nof_prb = 25
nof_prb = 25

[pcap]
enable = none
mac_filename = /tmp/ue_mac.pcap
mac_nr_filename = /tmp/ue_mac_nr.pcap
nas_filename = /tmp/ue_nas.pcap

[log]
all_level = info
phy_lib_level = none
all_hex_limit = 32
filename = /home/tmp/ue.log
file_max_size = -1

[usim]
mode = soft
algo = milenage
opc = 63BFA50EE6523365FF14C1F45F88737D
k = 00112233445566778899aabbccddeeff
imsi = 001010123456780
imei = 353490069873319

[rrc]
release = 15
ue_category = 4

[nas]
apn = srsapn
apn_protocol = ipv4

[gw]
#netns = ue1
#ip_devname = tun_srsue
#ip_netmask = 255.255.255.0

[gui]
enable = false

[expert]
lte_sample_rates = true

[pgawlowicz]

Please add this to your config:

cell_cfg:
...
  pucch:
    ....
    f0_or_f1_nof_cell_res_sr: 2
    f2_nof_cell_res_csi: 2