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Bug #5571

open

DUG can come up, but with Avail: "Power Off"

Added by keith 6 months ago. Updated 21 days ago.

Status:
New
Priority:
High
Assignee:
Target version:
-
Start date:
05/24/2022
Due date:
% Done:

0%

Spec Reference:

Description

Sometimes, after starting osmo-bsc, The BTS will transmit, we even start to get Channel requests, but this is the status:

OsmoBSC# show trx                                                                                                                                                                     
TRX 0 of BTS 0 is on ARFCN 251
  RF Nominal Power: 37 dBm, reduced by 0 dB, resulting BS power: 37 dBm
  Radio Carrier NM State: Oper 'NULL', Admin 'Unlocked', Avail 'Power off'
  RSL State: connected
  Baseband Transceiver NM State: Oper 'NULL', Admin 'Locked', Avail 'Power off'
  E1 Signalling Link:
    E1 Line 0, Type e1d: Timeslot 1, Mode RSL
    E1 TEI 0, SAPI 0

and of course we get such as this:

DRSL NOTICE <0003> abis_rsl.c:2193 (bts=0) CHAN RQD[Location updating]: no resources for SDCCH 0x4, retrying with TCH_F
DRLL DEBUG <0000> lchan_select.c:299 (bts=0) lchan_select_by_type(TCH_F)
DRLL DEBUG <0000> lchan_select.c:233 (bts=0) lchan_avail_by_type(TCH_F)
DRLL DEBUG <0000> lchan_select.c:65 looking for lchan TCH/F: (bts=0,trx=0) trx not usable
DRLL DEBUG <0000> lchan_select.c:65 looking for lchan TCH/F_PDCH as TCH/F without pchan switch: (bts=0,trx=0) trx not usable
DRLL DEBUG <0000> lchan_select.c:65 looking for lchan TCH/F_PDCH as TCH/F: (bts=0,trx=0) trx not usable
DRLL DEBUG <0000> lchan_select.c:65 looking for lchan TCH/F_TCH/H_SDCCH8_PDCH as TCH/F without pchan switch: (bts=0,trx=0) trx not usable
DRLL DEBUG <0000> lchan_select.c:65 looking for lchan TCH/F_TCH/H_SDCCH8_PDCH as TCH/F: (bts=0,trx=0) trx not usable
DRLL NOTICE <0000> lchan_select.c:305 (bts=0) Failed to select TCH_F channel

Stopping and restarting osmo-bsc will sooner ( or later :-/ ) get the TRX up....

Attached is osmo-bsc.log of the bring-up and pcap of same.

I suspect there is something happening in a certain order sometimes that causes this?


Files

abis.pcap abis.pcap 23.6 KB keith, 05/24/2022 01:48 AM
noAvail.log noAvail.log 172 KB keith, 05/24/2022 01:48 AM
Actions #1

Updated by keith 6 months ago

  • Description updated (diff)
Actions #2

Updated by laforge 6 months ago

  • Assignee set to laforge

Plan to look at it after June 15

Actions #3

Updated by tnt 6 months ago

By any chance is the TRX well cooled ?

Actions #4

Updated by keith 6 months ago

tnt wrote in #note-3:

By any chance is the TRX well cooled ?

In at least one case where this is observed, the TRX (RUS 01) is mounted in an RBS 6601 - (with rear fans running at full speed as there's nothing to connect to the EC)

Actions #5

Updated by laforge 22 days ago

  • Assignee changed from laforge to dexter
Actions #6

Updated by dexter 22 days ago

Hello Keith,

Thats interesting. I also have issues with the DUG20 I am using for tests. It seems not to like frequent BSC restarts. I see the "TRX 0 not usable" message quite often. A power-cycle usually helps. Can you post your osmo-bsc.cfg as well?

Best regards.
Philipp

Actions #7

Updated by keith 21 days ago

Hi dexter I don't have the actual config that would have been used when I wrote this six month old ticket. The DUG that was in use died, and it's not the first one we have lost. I don't have a DUG deployed anywhere right now, not even in the lab, as the lab moved house and I have not got around to setting up an antenna rig yet.

That makes 2 we've lost after not so many hours of operation, (apart from the units where we destroyed the serial port with +36V on the GND rail- they still work otherwise) - I have a suspicion that dust might be the culprit. Not that this is related to this issue, I just wonder whether we can expect a DUG to survive if we are blasting cooling air through it that is not filtered or at least reasonably dust free, (IE, not in a wooden hut on top of a windy hill in a semi-desert)

Anyway, the config would have been fairly "standard", that is to say, not much deviation from the example configs that ship with osmo-bsc. One thing possibly relevant would be the sync. IIRC, I see this ticket's issue regardless of if there is a GPS unit present and sync is external, or if we take the clock from the icE1usb

Something similar to this:


log stderr
 logging filter all 0
!
stats interval 10
stats reporter statsd
  remote-ip 127.0.0.1
  remote-port 8125
  level global
  no prefix
  enable
!
line vty
 no login
!
e1_input
 e1_line 0 driver e1d
 e1_line 0 port 0
 no e1_line 0 keepalive
 e1_line 0 pcap /root/cap/abis.last_start
cs7 instance 0
 point-code 0.43.1
network
 network country code 334
 mobile network code 07
 encryption a5 1
 neci 1
 paging any use tch 0
 handover 0
 meas-feed destination 127.0.0.1 8888
 neighbor-resolution bind 172.16.0.1 4248
 bts 0
  type rbs2000
  description DUG 20
  band GSM850
  cell_identity 100
  location_area_code 274
  base_station_id_code 63
  ms max power 37
  cell reselection hysteresis 4
  rxlev access min 0
  radio-link-timeout 32
  channel allocator descending
  channel allocator allow-tch-for-signalling 0
  rach tx integer 9
  rach max transmission 7
  rach max-delay 63
  channel-description attach 1
  channel-description bs-pa-mfrms 5
  channel-description bs-ag-blks-res 1
  no access-control-class-ramping
  early-classmark-sending forbidden
  early-classmark-sending-3g allowed
  oml e1 line 0 timeslot 1 sub-slot full
  oml e1 tei 62
  neighbor-list mode manual
  neighbor-list add arfcn 249
  codec-support fr
  gprs mode none
  no force-combined-si
  bs-power-control
   mode static
  ms-power-control
   mode dyn-bsc
   ctrl-interval 2
   step-size inc 4 red 2
   rxlev-thresh lower 32 upper 38
   rxlev-thresh-comp lower 10 12 upper 19 20
   rxqual-thresh lower 3 upper 0
   rxqual-thresh-comp lower 5 7 upper 15 18
  is-connection-list add 4 512 12
  is-connection-list add 16 524 12
  is-connection-list add 28 536 12
  is-connection-list add 40 548 12
  om2000 version-limit oml gen 12 rev 10
  om2000 sync-source internal
  trx 0
   rf_locked 0
   arfcn 247
   nominal power 37
   max_power_red 0
   rsl e1 line 0 timeslot 1 sub-slot full
   rsl e1 tei 0
   om2000 rx-diversity-mode a
   timeslot 0
    phys_chan_config CCCH
    hopping enabled 0
    e1 line 0 timeslot 1 sub-slot full
   timeslot 1
    phys_chan_config SDCCH8
    hopping enabled 0
    e1 line 0 timeslot 2 sub-slot 1
   timeslot 2
    phys_chan_config SDCCH8
    hopping enabled 0
    e1 line 0 timeslot 2 sub-slot 2
   timeslot 3
    phys_chan_config TCH/F
    hopping enabled 0
    e1 line 0 timeslot 2 sub-slot 3
   timeslot 4
    phys_chan_config TCH/F
    hopping enabled 0
    e1 line 0 timeslot 3 sub-slot 0
   timeslot 5
    phys_chan_config TCH/F
    hopping enabled 0
    e1 line 0 timeslot 3 sub-slot 1
   timeslot 6
    phys_chan_config TCH/F
    hopping enabled 0
    e1 line 0 timeslot 3 sub-slot 2
   timeslot 7
    phys_chan_config TCH/F
    hopping enabled 0
    e1 line 0 timeslot 3 sub-slot 3
  trx 1
   rf_locked 0
   arfcn 241
   nominal power 37
   max_power_red 0
   rsl e1 line 0 timeslot 4 sub-slot full
   rsl e1 tei 1
   om2000 rx-diversity-mode a
   timeslot 0
    phys_chan_config TCH/F
    hopping enabled 0
    e1 line 0 timeslot 5 sub-slot 0
   timeslot 1
    phys_chan_config TCH/F
    hopping enabled 0
    e1 line 0 timeslot 5 sub-slot 1
   timeslot 2
    phys_chan_config TCH/F
    hopping enabled 0
    e1 line 0 timeslot 5 sub-slot 2
   timeslot 3
    phys_chan_config TCH/F
    hopping enabled 0
    e1 line 0 timeslot 5 sub-slot 3
   timeslot 4
    phys_chan_config TCH/F
    hopping enabled 0
    e1 line 0 timeslot 6 sub-slot 0
   timeslot 5
    phys_chan_config TCH/F
    hopping enabled 0
    e1 line 0 timeslot 6 sub-slot 1
   timeslot 6
    phys_chan_config TCH/F
    hopping enabled 0
    e1 line 0 timeslot 6 sub-slot 2
   timeslot 7
    phys_chan_config TCH/F
    hopping enabled 0
    e1 line 0 timeslot 6 sub-slot 3
  trx 2
   rf_locked 0
   arfcn 251
   nominal power 37
   max_power_red 0
   rsl e1 line 0 timeslot 7 sub-slot full
   rsl e1 tei 2
   om2000 rx-diversity-mode a
   timeslot 0
    phys_chan_config SDCCH8
    hopping enabled 0
    e1 line 0 timeslot 8 sub-slot 0
   timeslot 1
    phys_chan_config SDCCH8
    hopping enabled 0
    e1 line 0 timeslot 8 sub-slot 1
   timeslot 2
    phys_chan_config SDCCH8
    hopping enabled 0
    e1 line 0 timeslot 8 sub-slot 2
   timeslot 3
    phys_chan_config SDCCH8
    hopping enabled 0
    e1 line 0 timeslot 8 sub-slot 3
   timeslot 4
    phys_chan_config TCH/F
    hopping enabled 0
    e1 line 0 timeslot 9 sub-slot 0
   timeslot 5
    phys_chan_config TCH/F
    hopping enabled 0
    e1 line 0 timeslot 9 sub-slot 1
   timeslot 6
    phys_chan_config TCH/F
    hopping enabled 0
    e1 line 0 timeslot 9 sub-slot 2
   timeslot 7
    phys_chan_config TCH/F
    hopping enabled 0
    e1 line 0 timeslot 9 sub-slot 3
  trx 3
   rf_locked 0
   arfcn 245
   nominal power 40
   max_power_red 0
   rsl e1 line 0 timeslot 10 sub-slot full
   rsl e1 tei 3
   om2000 rx-diversity-mode a
   timeslot 0
    phys_chan_config SDCCH8
    hopping enabled 0
    e1 line 0 timeslot 11 sub-slot 0
   timeslot 1
    phys_chan_config TCH/F
    hopping enabled 0
    e1 line 0 timeslot 11 sub-slot 1
   timeslot 2
    phys_chan_config TCH/F
    hopping enabled 0
    e1 line 0 timeslot 11 sub-slot 2
   timeslot 3
    phys_chan_config TCH/F
    hopping enabled 0
    e1 line 0 timeslot 11 sub-slot 3
   timeslot 4
    phys_chan_config TCH/F
    hopping enabled 0
    e1 line 0 timeslot 12 sub-slot 0
   timeslot 5
    phys_chan_config TCH/F
    hopping enabled 0
    e1 line 0 timeslot 12 sub-slot 1
   timeslot 6
    phys_chan_config TCH/F
    hopping enabled 0
    e1 line 0 timeslot 12 sub-slot 2
   timeslot 7
    phys_chan_config TCH/F
    hopping enabled 0
    e1 line 0 timeslot 12 sub-slot 3
msc 0
 codec-list fr1
 allow-emergency allow
 asp-protocol m3ua
 lcls-mode disabled
 lcls-codec-mismatch forbidden
 mgw remote-ip 127.0.0.1
 mgw remote-port 2427
bsc
 mid-call-timeout 0

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