MS Power Transmit not changing

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Sonny Lafuente sonny.lafuente at entropysolution.com
Thu Jul 29 05:33:25 UTC 2021 

Hello Neels and Community,

Good day!

We are doing some testing on our Lab specifically in Voice. During this testing we observed that the MS power transmit is not changing during ongoing call and the value is 5dbm. We also do walk test in order to lower the received power level and to observed if the MS Transmit power will increase. We tried to change some parameters in osmo-bts-trx uplink-power-target but however, the MS Transmit power still the same which is 5dbm. The MS power in the osmo-nitb config is set to 23dbm.  Below is the version and configuration we used on our testing in Lab.


Version:

OpenBSC# show version
OpenBSC 1.3.2.2-d2550 (OpenBSC).
Copyright (C) 2008-2016 Harald Welte, Holger Freyther
Contributions by Daniel Willmann, Jan Lübbe, Stefan Schmidt
Dieter Spaar, Andreas Eversberg, Sylvain Munaut, Neels Hofmeyr

License AGPLv3+: GNU AGPL version 3 or later <http://gnu.org/licenses/agpl-3.0.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

OpenBSC#


OsmoBTS# show version
OsmoBTS 1.2.0.48-6392 (OsmoBTS).
Copyright (C) 2010, 2011 by Harald Welte, Andreas Eversberg and On-Waves
License AGPLv3+: GNU AGPL version 3 or later <http://gnu.org/licenses/agpl-3.0.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

OsmoBTS#


Logs:

OpenBSC# show lchan
BTS 0, TRX 1, Timeslot 0, Lchan 0: Type SDCCH
  Connection: 1, State: ACTIVE
  BS Power: 0 dBm, MS Power: 23 dBm
  Channel Mode / Codec: signalling
  Subscriber:
    ID: 1816, Authorized: 0
    Extension: 164324
    IMSI: 515039102991665
    Use count: 1
  Bound IP: 0.0.0.0 Port 0 RTP_TYPE2=0 CONN_ID=0
  Measurement Report:
    Flags: DLinval
    RXL-FULL-ul:  -50 dBm, RXL-SUB-ul:  -50 dBm RXQ-FULL-ul: 7, RXQ-SUB-ul: 7
BTS 0, TRX 1, Timeslot 6, Lchan 0: Type TCH_F
  Connection: 1, State: ACTIVE
  BS Power: 0 dBm, MS Power: 23 dBm
  Channel Mode / Codec: FR or HR
  Subscriber:
    ID: 1782, Authorized: 1
    Extension: 05837654321
    IMSI: 515032920153135
    Use count: 2
  Bound IP: X.X.X.X Port 16386 RTP_TYPE2=0 CONN_ID=0
  Measurement Report:
    Flags:
    MS Timing Offset: 0
    L1 MS Power: 5 dBm, Timing Advance: 0
    RXL-FULL-dl:  -47 dBm, RXL-SUB-dl:  -47 dBm RXQ-FULL-dl: 0, RXQ-SUB-dl: 0
    RXL-FULL-ul:  -47 dBm, RXL-SUB-ul:  -47 dBm RXQ-FULL-ul: 0, RXQ-SUB-ul: 0
BTS 0, TRX 1, Timeslot 7, Lchan 0: Type TCH_F
  Connection: 1, State: ACTIVE
  BS Power: 0 dBm, MS Power: 23 dBm
  Channel Mode / Codec: FR or HR
  Subscriber:
    ID: 4, Authorized: 1
    Extension: 05831234567
    IMSI: 515032919099978
    Use count: 2
  Bound IP: X.X.X.X Port 16384 RTP_TYPE2=0 CONN_ID=0
  Measurement Report:
    Flags:
    MS Timing Offset: 0
    L1 MS Power: 5 dBm, Timing Advance: 0
    RXL-FULL-dl:  -47 dBm, RXL-SUB-dl:  -47 dBm RXQ-FULL-dl: 4, RXQ-SUB-dl: 5
    RXL-FULL-ul:  -47 dBm, RXL-SUB-ul:  -47 dBm RXQ-FULL-ul: 7, RXQ-SUB-ul: 7
OpenBSC#


Ongoing Call Logs:

OpenBSC# show lchan summary
BTS 0, TRX 1, Timeslot 6 TCH/F, Lchan 0, Type TCH_F, State ACTIVE - L1 MS Power: 5 dBm RXL-FULL-dl:  -47 dBm RXL-FULL-ul:  -47 dBm
BTS 0, TRX 1, Timeslot 7 TCH/F, Lchan 0, Type TCH_F, State ACTIVE - L1 MS Power: 5 dBm RXL-FULL-dl:  -47 dBm RXL-FULL-ul:  -47 dBm
OpenBSC#


Osmo-BTS current config:

e1_input
 e1_line 0 driver ipa
 e1_line 0 port 0
 no e1_line 0 keepalive
phy 0
 osmotrx ip local 127.0.0.1
 osmotrx ip remote 127.0.0.1
 no osmotrx ms-power-loop
 osmotrx base-port local 5800
 osmotrx base-port remote 5700
 osmotrx fn-advance 20
 osmotrx rts-advance 5
 instance 0

  osmotrx rx-gain 0
  osmotrx tx-attenuation 13
  osmotrx maxdly 0

 instance 1

  osmotrx rx-gain 0
  osmotrx tx-attenuation 10
  osmotrx maxdly 0

bts 0
 band GSM900
 ipa unit-id 1000 0
 oml remote-ip x.x.x.x
 rtp jitter-buffer 100
 paging queue-size 200
 paging lifetime 0
 uplink-power-target -75
 gsmtap-sapi ccch
 gsmtap-sapi pdtch
 min-qual-rach 50
 min-qual-norm -5
 max-ber10k-rach 1707
 trx 0
  power-ramp max-initial 0 mdBm
  power-ramp step-size 2000 mdB
  power-ramp step-interval 1
  ms-power-control dsp
  phy 0 instance 0
 trx 1
  power-ramp max-initial 0 mdBm
  power-ramp step-size 2000 mdB
  power-ramp step-interval 1
  ms-power-control dsp
  phy 0 instance 1


Osmo-Nitb Current Config:

root at ubuntu:/etc/osmocom# cat osmo-nitb.cfg
!
log stderr
  logging filter all 1
  logging color 1
  logging print category 0
  logging timestamp 1
  logging level all everything
  logging level rll notice
  logging level cc notice
  logging level mm notice
  logging level rr notice
  logging level rsl notice
  logging level nm info
  logging level mncc notice
  logging level pag notice
  logging level meas notice
  logging level sccp notice
  logging level msc notice
  logging level mgcp notice
  logging level ho notice
  logging level db notice
  logging level ref notice
  logging level gprs debug
  logging level ns info
  logging level bssgp debug
  logging level llc debug
  logging level sndcp debug
  logging level nat notice
  logging level ctrl notice
  logging level smpp debug
  logging level filter debug
  logging level ranap debug
  logging level sua debug
  logging level pcu debug
  logging level lglobal notice
  logging level llapd notice
  logging level linp notice
  logging level lmux notice
  logging level lmi notice
  logging level lmib notice
  logging level lsms notice
  logging level lctrl notice
  logging level lgtp notice
  logging level lstats notice
  logging level lgsup notice
  logging level loap notice
  logging level lss7 notice
  logging level lsccp notice
  logging level lsua notice
  logging level lm3ua notice
  logging level lmgcp notice
!
stats interval 5
!
line vty
 no login
!
e1_input
 e1_line 0 driver ipa
 e1_line 0 port 0
 no e1_line 0 keepalive
network
 network country code 10
 mobile network code 1
 short name testnetwork
 long name testnetwork
 auth policy closed
 authorized-regexp .*
 location updating reject cause 13
 encryption a5 0
 neci 1
 paging any use tch 0
 rrlp mode none
 mm info 1
 handover 0
 handover window rxlev averaging 10
 handover window rxqual averaging 1
 handover window rxlev neighbor averaging 10
 handover power budget interval 6
 handover power budget hysteresis 3
 handover maximum distance 9999

 timer t3113 60

 timer t3103 1

 timer t3101 10

 timer t3109 1

 timer t3122 10

 timer t3105 1

 dyn_ts_allow_tch_f 0
 subscriber-keep-in-ram 1

 bts 0
  type sysmobts
  band GSM900
  cell_identity 1
  location_area_code 1
  base_station_id_code 63
  ms max power 23
  cell reselection hysteresis 4
  rxlev access min 0
  periodic location update 30
  radio-link-timeout 32
  channel allocator descending
  rach tx integer 9
  rach max transmission 7
  channel-descrption attach 1
  channel-descrption bs-pa-mfrms 5
  channel-descrption bs-ag-blks-res 1
  early-classmark-sending forbidden
  ip.access unit_id 1000 0
  oml ip.access stream_id 255 line 0
  neighbor-list mode automatic
  codec-support fr hr efr amr
  amr tch-h modes 0
  amr tch-h start-mode auto
  gprs mode gprs
  gprs 11bit_rach_support_for_egprs 0
  gprs routing area 1
  gprs network-control-order nc0
  gprs cell bvci 2
  gprs cell timer blocking-timer 3
  gprs cell timer blocking-retries 3
  gprs cell timer unblocking-retries 3
  gprs cell timer reset-timer 3
  gprs cell timer reset-retries 3
  gprs cell timer suspend-timer 10
  gprs cell timer suspend-retries 3
  gprs cell timer resume-timer 10
  gprs cell timer resume-retries 3
  gprs cell timer capability-update-timer 10
  gprs cell timer capability-update-retries 3
  gprs nsei 101
  gprs ns timer tns-block 3
  gprs ns timer tns-block-retries 3
  gprs ns timer tns-reset 3
  gprs ns timer tns-reset-retries 3
  gprs ns timer tns-test 30
  gprs ns timer tns-alive 3
  gprs ns timer tns-alive-retries 10
  gprs nsvc 0 nsvci 101
  gprs nsvc 0 local udp port 23000
  gprs nsvc 0 remote udp port 23000
  gprs nsvc 0 remote ip 127.0.0.2
  gprs nsvc 1 nsvci 0
  gprs nsvc 1 local udp port 0
  gprs nsvc 1 remote udp port 0
  gprs nsvc 1 remote ip 0.0.0.0
  no force-combined-si

  trx 0
   rf_locked 0
   arfcn 122
   nominal power 0
   rsl e1 tei 0

   timeslot 0
    phys_chan_config CCCH+SDCCH4
    hopping enabled 0
   timeslot 1
    phys_chan_config SDCCH8
    hopping enabled 0
   timeslot 2
    phys_chan_config SDCCH8
    hopping enabled 0
   timeslot 3
    phys_chan_config TCH/F
    hopping enabled 0
   timeslot 4
    phys_chan_config TCH/F
    hopping enabled 0
   timeslot 5
    phys_chan_config TCH/F
    hopping enabled 0
   timeslot 6
    phys_chan_config TCH/F
    hopping enabled 0
   timeslot 7
    phys_chan_config TCH/F
    hopping enabled 0
  trx 1
   rf_locked 0
   arfcn 42
   nominal power 0
   rsl e1 tei 0

   timeslot 0
    phys_chan_config CCCH+SDCCH4
    hopping enabled 0
   timeslot 1
    phys_chan_config TCH/F
    hopping enabled 0
   timeslot 2
    phys_chan_config TCH/F
    hopping enabled 0
   timeslot 3
    phys_chan_config TCH/F
    hopping enabled 0
   timeslot 4
    phys_chan_config TCH/F
    hopping enabled 0
   timeslot 5
    phys_chan_config TCH/F
    hopping enabled 0
   timeslot 6
    phys_chan_config TCH/F
    hopping enabled 0
   timeslot 7
    phys_chan_config TCH/F
    hopping enabled 0
mncc-int
 default-codec tch-f fr
 default-codec tch-h amr
nitb
 subscriber-create-on-demand

 subscriber-create-on-demand random 100000 199999
 no assign-tmsi
smpp
 local-tcp-ip 127.0.0.1 2776
 system-id password
 policy closed
 smpp-first
 esme admin
  password password
  default-route
Rootubuntu:/etc/osmocom#






Regards,

Sonny Lafuente | Systems Engineer | Entropy Solution Philippines
Mobile: +639985365206 | Office: 028931781 | Email: sonny.lafuente at entropysolution.com<mailto:sonny.lafuente at entropysolution.com>
Office Address: Unit 2103 Antel Corporate  Centre 121 Valero St. Salcedo Village Makati City Philippines 1227

[cid:936BCCE1-8AAB-4E96-8413-E1075D00DBE3]

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Products:
Gridloc*Intelle*Hype*Lighthouse*Telco Services*Software Development
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