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Bug #3161

osmo-bts does not send State Changed Event Reports when RF is locked/unlocked

Added by stsp 8 months ago. Updated 7 months ago.

Status:
Resolved
Priority:
Normal
Assignee:
Category:
-
Target version:
-
Start date:
04/12/2018
Due date:
% Done:

0%

Spec Reference:

Description

A nanobts sends 'State Changed Event Reports' when RF is locked/unlocked.
This same state change is redundantly reported in an 'Administrative State Change ACK'.

osmo-bts only reports the administrative state change in the 'Administrative State Change ACK'.
For better interop with ipaccess equipment it should also send a 'State Changed Event Report'
just like the nanobts does.

For instance, consider the following 'State Changed Event Report' sent by a nanobts.
osmo-bts does not send such a report at present. It only sends 'State Changed Event Reports'
for operational and availability state changes, but not administrative ones.

Frame 8: 74 bytes on wire (592 bits), 74 bytes captured (592 bits) on interface 0
Ethernet II, Src: IpAccess_00:5a:d7 (00:02:95:00:5a:d7), Dst: WistronI_9e:0e:57 (f0:de:f1:9e:0e:57)
Internet Protocol Version 4, Src: 192.168.100.4, Dst: 192.168.100.11
Transmission Control Protocol, Src Port: 6611, Dst Port: 3002, Seq: 19, Ack: 19, Len: 20
IPA protocol ip.access, type: OML
GSM A-bis OML, Radio Carrier(00,00,ff) State Changed Event Report 
    Message Discriminator: Formatted O&M (0x80)
    Placement Indicator: Only (0x80)
    Sequence Number: 0x00
    Length Indicator: 13
    FOM Message Type: State Changed Event Report
        FOM Object Class: Radio Carrier (0x02)
        FOM Object Instance BTS: 0
        FOM Object Instance TRX: 0
        FOM Object Instance TS: 255
        FOM Attribute ID: Operational State
            FOM Attribute Length: 1
            Operational State: Disabled (0x01)
        FOM Attribute ID: Availability Status
            FOM Attribute Length: 1
            Availability Status: Off line (0x03)
        FOM Attribute ID: Administrative State
            FOM Attribute Length: 1
            Administrative State: Unlocked (0x02)

The above report was preceded by the Administrative State Changed ACK:

Frame 5: 68 bytes on wire (544 bits), 68 bytes captured (544 bits) on interface 0
Ethernet II, Src: IpAccess_00:5a:d7 (00:02:95:00:5a:d7), Dst: WistronI_9e:0e:57 (f0:de:f1:9e:0e:57)
Internet Protocol Version 4, Src: 192.168.100.4, Dst: 192.168.100.11
Transmission Control Protocol, Src Port: 6611, Dst Port: 3002, Seq: 5, Ack: 19, Len: 14
IPA protocol ip.access, type: OML
GSM A-bis OML, Radio Carrier(00,00,ff) Change Administrative State ACK 
    Message Discriminator: Formatted O&M (0x80)
    Placement Indicator: Only (0x80)
    Sequence Number: 0x00
    Length Indicator: 7
    FOM Message Type: Change Administrative State ACK
        FOM Object Class: Radio Carrier (0x02)
        FOM Object Instance BTS: 0
        FOM Object Instance TRX: 0
        FOM Object Instance TS: 255
        FOM Attribute ID: Administrative State
            FOM Attribute Length: 1
            Administrative State: Unlocked (0x02)

This issue was discovered during work on issue #2591, in particular in changeset: https://gerrit.osmocom.org/#/c/7770/

History

#1 Updated by stsp 8 months ago

  • Assignee set to stsp

#2 Updated by stsp 7 months ago

  • Status changed from New to Resolved

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