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Bug #3513
closedunsolicited channel activation acknowledge
Start date:
08/31/2018
Due date:
% Done:
100%
Spec Reference:
Description
While running TTCN3 tests with a sysmobts and osmocom-bb, I ran into test failure "RSL for unknown Dchan"
Specifically, while the BTS is being configured, this code in RSL Emulation is triggered by an
unsolicited channel activation acknowledge RSL message:
[not dchan_suspended] IPA_PT.receive(tr_RSL(tr_RSL_MsgTypeDR(?))) -> value rx_rsl {
/* dispatch to channel based on ChanId */
cid := f_cid_by_chan_nr(f_trx_by_streamId(rx_rsl.streamId),
rx_rsl.rsl.ies[0].body.chan_nr);
if (cid != -1) {
CLIENT_PT.send(rx_rsl.rsl) to ConnectionTable[cid].comp_ref;
} else {
setverdict(fail, "RSL for unknown Dchan");
mtc.stop;
}
}
Frame 396: 76 bytes on wire (608 bits), 76 bytes captured (608 bits) on interface 0
Ethernet II, Src: Sysmocom_00:00:0a (24:62:78:00:00:0a), Dst: WistronI_9e:0e:57 (f0:de:f1:9e:0e:57)
Internet Protocol Version 4, Src: 192.168.100.3, Dst: 192.168.100.11
Transmission Control Protocol, Src Port: 47256, Dst Port: 3003, Seq: 46, Ack: 11, Len: 10
IPA protocol ip.access, type: RSL
DataLen: 7
Protocol: RSL (0x00)
Radio Signalling Link (RSL)
0000 100. = Message discriminator: Dedicated Channel Management messages (4)
.... ...0 = T bit: Not considered transparent by BTS
.010 0010 = Message type: CHANnel ACTIVation ACKnowledge (0x22)
Channel number IE
Element identifier: Channel Number (0x01)
0010 0... = C-bits: SDCCH/4 + ACCH (sub-chan 0) (4)
.... .000 = Time slot number (TN): 0
Frame Number IE
Element identifier: Frame Number (0x08)
0000 0... = T1': 0
.... .011 001. .... = T3: 25
...1 1000 = T2: 24
Here is another example after changing the control channel 0 to BCCH:
Frame 53997: 76 bytes on wire (608 bits), 76 bytes captured (608 bits) on interface 0
Ethernet II, Src: Sysmocom_00:00:0a (24:62:78:00:00:0a), Dst: WistronI_9e:0e:57 (f0:de:f1:9e:0e:57)
Internet Protocol Version 4, Src: 192.168.100.3, Dst: 192.168.100.11
Transmission Control Protocol, Src Port: 47660, Dst Port: 3003, Seq: 46, Ack: 11, Len: 10
IPA protocol ip.access, type: RSL
DataLen: 7
Protocol: RSL (0x00)
Radio Signalling Link (RSL)
0000 100. = Message discriminator: Dedicated Channel Management messages (4)
.... ...0 = T bit: Not considered transparent by BTS
.010 0010 = Message type: CHANnel ACTIVation ACKnowledge (0x22)
Channel number IE
Element identifier: Channel Number (0x01)
1000 0... = C-bits: BCCH (16)
.... .000 = Time slot number (TN): 0
Frame Number IE
Element identifier: Frame Number (0x08)
0000 0... = T1': 0
.... .100 001. .... = T3: 33
...0 0110 = T2: 6
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