Home » Eclipse Projects » Eclipse Titan » Native ASN.1 PER for CHOICE(It seems that native PER generator doesn't produce the PER_encode/decode for CHOICE types)
| Native ASN.1 PER for CHOICE [message #1866423] |
Wed, 29 May 2024 14:27  |
 Anton Kozhemyachenko
Messages: 16
Registered: June 2021 |
Junior Member |
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Hello, I have the issues with encoding/decoding PER for ETSI ASN.1 using native PER codec.
Tried on Titan ver 10.0.0 and on ToT master branch (commit ae86274).
For the following structure from ETSI NR_RRC_ASN1_Definitions.asn:
SetupRelease { ElementTypeParam } ::= CHOICE {
release NULL,
setup ElementTypeParam
}
SpCellConfig ::= SEQUENCE {
// skipped the details...
rlf-TimersAndConstants SetupRelease { RLF-TimersAndConstants } OPTIONAL,
// skipped the details...
}
The XER file is:
<CellGroupConfig>
<cellGroupId>0</cellGroupId>
<spCellConfig>
<rlf-TimersAndConstants>
<setup>
<t310>ms1000</t310>
<n310>n1</n310>
<n311>n1</n311>
<t311>ms1000</t311>
</setup>
</rlf-TimersAndConstants>
</spCellConfig>
</CellGroupConfig>
The correct PER representation should be '0404D400101000'. However, the generated Titan code can't encode/decode this structure [with API obj.encode(...), obj.decode(...)] with the following error:
Dynamic test case error: PER decoding requested for type '@NR-RRC-ASN1-Definitions.SpCellConfig.rlf-TimersAndConstants' which has no PER decoding method.
The CHOICE is directly derived from Base_Type, where PER_encode is not implemented. And the code doesn't have its own PER_encode function for 'rlf__TimersAndConstants'. I checked a few other types, it looks like PER encoders are generated for CHOICE types at all.
I believe, the configuration is done correctly on my side to enable internal PER coder, since the following data is able to decode:
PER: 0000 ->
<CellGroupConfig>
<cellGroupId>0</cellGroupId>
</CellGroupConfig>
Could you please take a look, whether I missed something, or there is an issue in Titan. Thank you in advance.
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| Re: Native ASN.1 PER for CHOICE [message #1866432 is a reply to message #1866423] |
Wed, 29 May 2024 15:36  |
Botond Baranyi
Messages: 56
Registered: February 2016 |
Member |
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Hi,
I have not managed to reproduce this issue. I don't have access to the mentioned ASN.1 file, but I've successfully encoded and decoded a value of the following type using our PER codec:
RLF-TimersAndConstants ::= SEQUENCE {
t310 VisibleString,
n310 VisibleString,
n311 VisibleString,
t311 VisibleString
}
SetupRelease { ElementTypeParam } ::= CHOICE {
release NULL,
setup ElementTypeParam
}
SpCellConfig ::= SEQUENCE {
rlf-TimersAndConstants SetupRelease { RLF-TimersAndConstants } OPTIONAL
}
I'd suggest trying again with the latest version of TITAN.
If that doesn't work, then please send me the type definitions, which cause the issue.
Best regards,
Botond Baranyi
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| Re: Native ASN.1 PER for CHOICE [message #1866543 is a reply to message #1866432] |
Fri, 31 May 2024 15:18 |
Olaf Bergengruen
Messages: 128
Registered: November 2018 |
Senior Member |
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Hi Anton,
I just tested your data in my test environment: Titan (version 10.1.0) works fine.
Below my test case verifying encoding/decoding:
testcase TC_121() runs on TestSystem system TestSystem {
var CellGroupConfig v_Decoded_CellGroupConfig;
var bitstring v_Encoded;
const octetstring tsc_Reference_Encoding := '0404D400101000'O;
const CellGroupConfig tsc_Decoded_CellGroupConfig :=
{ cellGroupId := 0, rlc_BearerToAddModList := omit, rlc_BearerToReleaseList := omit, mac_CellGroupConfig := omit, physicalCellGroupConfig := omit,
spCellConfig := { servCellIndex := omit, reconfigurationWithSync := omit, rlf_TimersAndConstants :=
{ setup := { t310 := ms1000, n310 := n1, n311 := n1, t311 := ms1000 } },
rlmInSyncOutOfSyncThreshold := omit, spCellConfigDedicated := omit,
lowMobilityEvaluationConnected_r17 := omit, goodServingCellEvaluationRLM_r17 := omit,
goodServingCellEvaluationBFD_r17 := omit, deactivatedSCG_Config_r17 := omit },
sCellToAddModList := omit,
sCellToReleaseList := omit, reportUplinkTxDirectCurrent := omit,
bap_Address_r16 := omit, bh_RLC_ChannelToAddModList_r16 := omit,
bh_RLC_ChannelToReleaseList_r16 := omit, f1c_TransferPath_r16 := omit,
simultaneousTCI_UpdateList1_r16 := omit,
simultaneousTCI_UpdateList2_r16 := omit, simultaneousSpatial_UpdatedList1_r16 := omit,
simultaneousSpatial_UpdatedList2_r16 := omit, uplinkTxSwitchingOption_r16 := omit,
uplinkTxSwitchingPowerBoosting_r16 := omit, reportUplinkTxDirectCurrentTwoCarrier_r16 := omit,
f1c_TransferPathNRDC_r17 := omit, uplinkTxSwitching_2T_Mode_r17 := omit,
uplinkTxSwitching_DualUL_TxState_r17 := omit,
uu_RelayRLC_ChannelToAddModList_r17 := omit, uu_RelayRLC_ChannelToReleaseList_r17 := omit,
simultaneousU_TCI_UpdateList1_r17 := omit, simultaneousU_TCI_UpdateList2_r17 := omit,
simultaneousU_TCI_UpdateList3_r17 := omit, simultaneousU_TCI_UpdateList4_r17 := omit,
rlc_BearerToReleaseListExt_r17 := omit, iab_ResourceConfigToAddModList_r17 := omit,
iab_ResourceConfigToReleaseList_r17 := omit, reportUplinkTxDirectCurrentMoreCarrier_r17 := omit }
// Encoding
v_Encoded := encvalue(tsc_Decoded_CellGroupConfig, "", "PER");
log(bit2oct(v_Encoded));
if (bit2oct(v_Encoded) == tsc_Reference_Encoding) {
setverdict(pass);
log("Encoding OK");
} else {
setverdict(fail);
log("*** ASN.1 encoding not as expected, Expected");
}
// Decoding
v_Encoded := oct2bit(tsc_Reference_Encoding);
if (decvalue(v_Encoded, v_Decoded_CellGroupConfig, "", "PER") != 0) {
log("ERROR decvalue - failed");
setverdict(fail);
self.stop;
} else {
setverdict(pass);
//log(v_Decoded_CellGroupConfig);
}
// Verification
if (match (v_Decoded_CellGroupConfig, tsc_Decoded_CellGroupConfig)) {
log("Decoding OK");
setverdict(pass);
} else {
log (match (v_Decoded_CellGroupConfig, tsc_Decoded_CellGroupConfig));
log("***ERR incorrect decode - failed");
setverdict(fail);
}
if (getverdict == pass) {
log(testcasename() &" PASS");
} else {
log(testcasename() &" FAIL");
}
} // TC
Regards,
Olaf - olafalejandro.bergengruen@web.de
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