module BSSMAP_Templates {

import from General_Types all;
import from Osmocom_Types all;
import from GSM_Types all;
import from BSSAP_Types all;

type integer BssmapCause;

/* 48.008 3.2.2.5 - this actually belongs to BSSAP_Types.ttcn */
type enumerated myBSSMAP_Cause {
	/* 000 / 001: Normal event */
	GSM0808_CAUSE_RADIO_INTERFACE_MESSAGE_FAILURE			('0000000'B),
	GSM0808_CAUSE_RADIO_INTERFACE_FAILURE				('0000001'B),
	GSM0808_CAUSE_UPLINK_QUALITY					('0000010'B),
	GSM0808_CAUSE_UPLINK_STRENGTH					('0000011'B),
	GSM0808_CAUSE_DOWNLINK_QUALITY					('0000100'B),
	GSM0808_CAUSE_DOWNLINK_STRENGTH					('0000101'B),
	GSM0808_CAUSE_DISTANCE						('0000110'B),
	GSM0808_CAUSE_O_AND_M_INTERVENTION				('0000111'B),
	GSM0808_CAUSE_RESPONSE_TO_MSC_INVOCATION			('0001000'B),
	GSM0808_CAUSE_CALL_CONTROL					('0001001'B),
	GSM0808_CAUSE_RADIO_INTERFACE_FAILURE_REVERSION			('0001010'B),
	GSM0808_CAUSE_HANDOVER_SUCCESSFUL				('0001011'B),
	GSM0808_CAUSE_BETTER_CELL					('0001100'B),
	GSM0808_CAUSE_DIRECTED_RETRY					('0001101'B),
	GSM0808_CAUSE_JOINED_GROUP_CALL_CHANNEL				('0001110'B),
	GSM0808_CAUSE_TRAFFIC						('0001111'B),
	GSM0808_CAUSE_REDUCE_LOAD_IN_SERVING_CELL			('0010000'B),
	GSM0808_CAUSE_TRAFFIC_LOAD_IN_TGT_HIGHER_THAN_IN_SRC_CELL	('0010001'B),
	GSM0808_CAUSE_RELOCATION_TRIGGERED				('0010010'B),
	GSM0808_CAUSE_REQUSTED_OPT_NOT_AUTHORISED			('0010100'B),
	GSM0808_CAUSE_ALT_CHAN_CONFIG_REQUESTED				('0010101'B),
	GSM0808_CAUSE_RESP_TO_INT_HO_ENQ_MSG				('0010110'B),
	GSM0808_CAUSE_INT_HO_ENQUIRY_REJECT				('0010111'B),
	GSM0808_CAUSE_REDUNDANCY_LEVEL_NOT_ADEQUATE			('0011000'B),
	/* reserved */
	/* 010: Resource unavailable */
	GSM0808_CAUSE_EQUIPMENT_FAILURE					('0100000'B),
	GSM0808_CAUSE_NO_RADIO_RESOURCE_AVAILABLE			('0100001'B),
	GSM0808_CAUSE_RQSTED_TERRESTRIAL_RESOURCE_UNAVAILABLE		('0100010'B),
	GSM0808_CAUSE_CCCH_OVERLOAD					('0100011'B),
	GSM0808_CAUSE_PROCESSOR_OVERLOAD				('0100100'B),
	GSM0808_CAUSE_BSS_NOT_EQUIPPED					('0100101'B),
	GSM0808_CAUSE_MS_NOT_EQUIPPED					('0100110'B),
	GSM0808_CAUSE_INVALID_CELL					('0100111'B),
	GSM0808_CAUSE_TRAFFIC_LOAD					('0101000'B),
	GSM0808_CAUSE_PREEMPTION					('0101001'B),
	GSM0808_CAUSE_DTM_HO_SGSN_FAILURE				('0101010'B),
	GSM0808_CAUSE_DTM_HO_PS_ALLOC_FAILURE				('0101011'B),
	/* reserved */
	/* 011: Service or option not available, but implemented */
	GSM0808_CAUSE_RQSTED_TRANSCODING_RATE_ADAPTION_UNAVAILABLE	('0110000'B),
	GSM0808_CAUSE_CIRCUIT_POOL_MISMATCH				('0110001'B),
	GSM0808_CAUSE_SWITCH_CIRCUIT_POOL				('0110010'B),
	GSM0808_CAUSE_RQSTED_SPEECH_VERSION_UNAVAILABLE			('0110011'B),
	GSM0808_CAUSE_LSA_NOT_ALLOWED					('0110100'B),
	GSM0808_CAUSE_REQ_CODEC_TYPE_OR_CONFIG_UNAVAIL			('0110101'B),
	GSM0808_CAUSE_REQ_A_IF_TYPE_UNAVAIL				('0110110'B),
	GSM0808_CAUSE_INVALID_CSG_CELL					('0110111'B),
	/* reserved */
	/* 100: Service or option not implemented or currently disabled */
	GSM0808_CAUSE_REQ_REDUND_LEVEL_NOT_AVAIL			('0111111'B),
	GSM0808_CAUSE_CIPHERING_ALGORITHM_NOT_SUPPORTED			('1000000'B),
	GSM0808_CAUSE_GERAN_IU_MODE_FAILURE				('1000001'B),
	GSM0808_CAUSE_INC_RELOC_NOT_SUPP_DT_PUESBINE_FEATURE		('1000010'B),
	GSM0808_CAUSE_ACCESS_RESTRICTED_DUE_TO_SHARED_NETWORKS		('1000011'B),
	GSM0808_CAUSE_REQ_CODEC_TYPE_OR_CONFIG_NOT_SUPP			('1000100'B),
	GSM0808_CAUSE_REQ_A_IF_TYPE_NOT_SUPP				('1000101'B),
	GSM0808_CAUSE_REQ_REDUND_LVL_NOT_SUPP				('1000110'B),
	/* reserved */
	/* 101: Invalid message */
	GSM0808_CAUSE_TERRESTRIAL_CIRCUIT_ALREADY_ALLOCATED		('1010000'B),
	GSM0808_CAUSE_INVALID_MESSAGE_CONTENTS				('1010001'B),
	GSM0808_CAUSE_INFORMATION_ELEMENT_OR_FIELD_MISSING		('1010010'B),
	GSM0808_CAUSE_INCORRECT_VALUE					('1010011'B),
	GSM0808_CAUSE_UNKNOWN_MESSAGE_TYPE				('1010100'B),
	GSM0808_CAUSE_UNKNOWN_INFORMATION_ELEMENT			('1010101'B),
	GSM0808_CAUSE_DTM_HO_INVALID_PS_IND				('1010110'B),
	GSM0808_CAUSE_CALL_ID_ALREADY_ALLOC				('1010111'B),
	/* reserved */
	/* 110: protocol error */
	GSM0808_CAUSE_PROTOCOL_ERROR_BETWEEN_BSS_AND_MSC		('1100000'B),
	GSM0808_CAUSE_VGCS_VBS_CALL_NON_EXISTANT			('1100001'B),
	GSM0808_CAUSE_DTM_HO_TIMER_EXPIRY				('1100010'B)
} with { variant "FIELDLENGTH(7)" };

template PDU_BSSAP ts_BSSAP_BSSMAP := {
	discriminator := '0'B,
	spare := '0000000'B,
	dlci := omit,
	lengthIndicator := 0,	/* overwritten by codec */
	pdu := {
		bssmap := ?
	}
}

template PDU_BSSAP tr_BSSAP_BSSMAP := {
	discriminator := '0'B,
	spare := '0000000'B,
	dlci := omit,
	lengthIndicator := ?,
	pdu := {
		bssmap := ?
	}
}

template PDU_BSSAP ts_BSSAP_DTAP := {
	discriminator := '1'B,
	spare := '0000000'B,
	dlci := omit,
	lengthIndicator := 0,	/* overwritten by codec */
	pdu := {
		dtap := ?
	}
}

template PDU_BSSAP tr_BSSAP_DTAP := {
	discriminator := '1'B,
	spare := '0000000'B,
	dlci := omit,
	lengthIndicator := ?,
	pdu := {
		dtap := ?
	}
}


template (value) BSSMAP_IE_Cause ts_BSSMAP_IE_Cause(BssmapCause val) := {
	elementIdentifier := '04'O,
	lengthIndicator := 0,
	causeValue := int2bit(val, 7),
	extensionCauseValue := '0'B,
	spare1 := omit
}

template (value) PDU_BSSAP ts_BSSMAP_Reset(BssmapCause cause) modifies ts_BSSAP_BSSMAP := {
	pdu := {
		bssmap := {
			reset := {
				messageType := '30'O,
				cause := ts_BSSMAP_IE_Cause(cause),
				a_InterfaceSelectorForReset := omit
			}
		}
	}
}

template PDU_BSSAP tr_BSSMAP_Reset modifies tr_BSSAP_BSSMAP := {
	pdu := {
		bssmap := {
			reset := {
				messageType := '30'O,
				cause := ?,
				a_InterfaceSelectorForReset := *
			}
		}
	}
}

template (value) PDU_BSSAP ts_BSSMAP_ResetAck modifies ts_BSSAP_BSSMAP := {
	pdu := {
		bssmap := {
			resetAck := {
				messageType := '31'O,
				a_InterfaceSelectorForReset := omit
			}
		}
	}
}

template PDU_BSSAP tr_BSSMAP_ResetAck modifies tr_BSSAP_BSSMAP := {
	pdu := {
		bssmap := {
			resetAck := {
				messageType := '31'O,
				a_InterfaceSelectorForReset := *
			}
		}
	}
}

template BSSMAP_IE_CellIdentifier ts_BSSMAP_IE_CellID := {
	elementIdentifier := '05'O,
	lengthIndicator := 0,
	cellIdentifierDiscriminator := '0000'B,
	spare1_4 := '0000'B,
	cellIdentification := ?
}

type uint16_t BssmapLAC;
type uint16_t BssmapCI;

/*
template BSSMAP_IE_CellIdentifier ts_CellId_CGI(mcc, mnc, lac, ci)
modifies ts_BSSMAP_IE_CellID := {
	cellIdentification := {
		cI_LAC_CGI := {
			mnc_mcc := FIXME,
			lac := int2oct(lac, 2),
			ci := int2oct(ci, 2)
		}
	}
}
*/

template BSSMAP_IE_CellIdentifier ts_CellID_LAC_CI(BssmapLAC lac, BssmapCI ci)
modifies ts_BSSMAP_IE_CellID := {
	cellIdentification := {
		cI_LAC_CI := {
			lac := int2oct(lac, 2),
			ci := int2oct(ci, 2)
		}
	}
}

template BSSMAP_IE_CellIdentifier ts_CellId_CI(BssmapCI ci)
modifies ts_BSSMAP_IE_CellID := {
	cellIdentification := {
		cI_CI := int2oct(ci, 2)
	}
}

template BSSMAP_IE_CellIdentifier ts_CellId_none
modifies ts_BSSMAP_IE_CellID := {
	cellIdentification := {
		cI_noCell := ''O
	}
}


template BSSMAP_IE_Layer3Information ts_BSSMAP_IE_L3Info(octetstring l3info) := {
	elementIdentifier := '17'O,
	lengthIndicator := 0,
	layer3info := l3info
}

template BSSMAP_IE_Layer3Information tr_BSSMAP_IE_L3Info(template octetstring l3info) := {
	elementIdentifier := '17'O,
	lengthIndicator := ?,
	layer3info := l3info
}


template PDU_BSSAP ts_BSSMAP_ComplL3(BSSMAP_IE_CellIdentifier cell_id, octetstring l3_info)
modifies ts_BSSAP_BSSMAP := {
	pdu := {
		bssmap := {
			completeLayer3Information := {
				messageType := '57'O,
				cellIdentifier := cell_id,
				layer3Information := ts_BSSMAP_IE_L3Info(l3_info),
				chosenChannel := omit,
				lSAIdentifier := omit,
				aPDU := omit,
				codecList := omit,
				redirectAttemptFlag := omit,
				sendSequenceNumber := omit,
				iMSI := omit
			}
		}
	}
}

template PDU_BSSAP tr_BSSMAP_ComplL3(template octetstring l3_info := ?,
				     template BSSMAP_IE_CellIdentifier cell_id := ?)
modifies tr_BSSAP_BSSMAP := {
	pdu := {
		bssmap := {
			completeLayer3Information := {
				messageType := '57'O,
				cellIdentifier := cell_id,
				layer3Information := tr_BSSMAP_IE_L3Info(l3_info),
				chosenChannel := *,
				lSAIdentifier := *,
				aPDU := *,
				codecList := *,
				redirectAttemptFlag := *,
				sendSequenceNumber := *,
				iMSI := *
			}
		}
	}
}

template BSSMAP_IE_CellIdentifierList ts_BSSMAP_IE_CidList(BSSMAP_FIELD_CellIdentificationList cid_list) := {
	elementIdentifier := '1A'O,
	lengthIndicator := 0, /* overwritten */
	cellIdentifierDiscriminator := '0000'B, /* overwritten */
	spare1_4 := '0000'B,
	cellIdentificationList := cid_list
}

template PDU_BSSAP ts_BSSMAP_HandoReq(BssmapCause cause, BSSMAP_FIELD_CellIdentificationList cid_list)
modifies ts_BSSAP_BSSMAP := {
	pdu := {
		bssmap := {
			handoverRequired := {
				messageType := '11'O,
				cause := ts_BSSMAP_IE_Cause(cause),
				responseRequest := omit,
				cellIdentifierList := ts_BSSMAP_IE_CidList(cid_list),
				circuitPoolList := omit,
				currentChannelType1 := omit,
				speechVersion := omit,
				queueingIndicator := omit,
				oldToNewBSSInfo := omit,
				sourceToTargetRNCTransparentInfo := omit,
				sourceToTargetRNCTransparentInfoCDMA := omit,
				gERANClassmark := omit,
				talkerPriority := omit,
				speechCodec := omit,
				cSG_Identifier := omit
			}
		}
	}
}

const OCT1 ChRate_ANY := '00'O;
const OCT1 ChRate_TCHF	:= '08'O;
const OCT1 ChRate_TCHH	:= '09'O;
const OCT1 ChRate_TCHForH_Fpref := '0A'O;
const OCT1 ChRate_TCHForH_Hpref := '0B'O;
const OCT1 ChRate_TCHForH_Fpref_nochg := '1A'O;
const OCT1 ChRate_TCHForH_Hpref_nochg := '1B'O;
const OCT1 ChRate_TCHForH := '0F'O;
const OCT1 ChRate_TCHForH_nochg := '1F'O;

template (value) BSSMAP_IE_ChannelType ts_BSSMAP_IE_ChannelType := {
	elementIdentifier := '0B'O,	/* overwritten */
	lengthIndicator := 0,		/* overwritten */
	speechOrDataIndicator := '0001'B,	/* speech */
	spare1_4 := '0000'B,
	channelRateAndType := ChRate_TCHF,
	speechId_DataIndicator := '01'O	/* FRv1 */
}

template (value) BSSMAP_IE_ChannelType ts_BSSMAP_IE_ChannelTypeCTM modifies ts_BSSMAP_IE_ChannelType := {
	speechOrDataIndicator := '0100'B	/* speech + CTM */
}

template (value) BSSMAP_IE_ChannelType ts_BSSMAP_IE_ChannelTypeCSD := {
	elementIdentifier := '0B'O,	/* overwritten */
	lengthIndicator := 0,		/* overwritten */
	speechOrDataIndicator := '0010'B,	/* data */
	spare1_4 := '0000'B,
	channelRateAndType := ChRate_TCHF,
	speechId_DataIndicator := '10'O	/* 9600 bps / transparent */
}

template (value) BSSMAP_IE_ChannelType ts_BSSMAP_IE_ChannelTypeSIGNAL := {
	elementIdentifier := '0B'O,	/* overwritten */
	lengthIndicator := 0,		/* overwritten */
	speechOrDataIndicator := '0011'B,	/* data */
	spare1_4 := '0000'B,
	channelRateAndType := ChRate_ANY,
	speechId_DataIndicator := '00'O	/* spare */
}

template (value) BSSMAP_IE_EncryptionInformation ts_BSSMAP_IE_EncrInfo(OCT8 kc, OCT1 algs := '05'O) := {
	elementIdentifier := '0A'O,
	lengthIndicator := 0,	/* overwritten */
	permittedAlgorithms := algs,
	key := kc
}


template (value) BSSMAP_IE_CircuitIdentityCode ts_BSSMAP_IE_CIC(uint11_t span, uint5_t ts) := {
	elementIdentifier := '01'O,	/* overwritten */
	cicHigh := bit2oct(substr(int2bit(span, 11) << 5, 0, 8)),
	cicLow := bit2oct((substr(int2bit(span, 11), 8, 3) << 5) & int2bit(ts, 5))
}

template (value) BSSMAP_IE_AoIP_TransportLayerAddress ts_BSSMAP_IE_AoIP_TLA(BSSMAP_FIELD_IPAddress addr,
									    uint16_t udp_port) := {
	elementIdentifier := '7C'O,
	lengthIndicator := 0, /* overwritten */
	ipAddress := addr,
	uDPPortValue := udp_port
}

template (value) BSSMAP_IE_KC128 ts_BSSMAP_IE_Kc128(OCT16 kc128) := {
	elementIdentifier := '83'O,
	kC128_Value := kc128
}

template PDU_BSSAP
ts_BSSMAP_AssignmentReq(template BSSMAP_IE_CircuitIdentityCode cic := omit,
			template BSSMAP_IE_AoIP_TransportLayerAddress aoip := omit)
modifies ts_BSSAP_BSSMAP := {
	pdu := {
		bssmap := {
			assignmentRequest := {
				messageType :='01'O,	/* overwritten */
				channelType := ts_BSSMAP_IE_ChannelType,
				layer3HeaderInfo := omit,
				priority := omit,
				circuitIdentityCode := cic,
				downLinkDTX_Flag := omit,
				interferenceBandToBeUsed := omit,
				classmarkInformationType2 := omit,
				groupCallReference := omit,
				talkerFlag := omit,
				configurationEvolutionIndication := omit,
				lsaAccesControlSuppression := omit,
				serviceHandover := omit,
				encryptionInformation := omit,
				talkerPriority := omit,
				aoIPTransportLayer := aoip,
				codecList := omit,
				callIdentifier := omit,
				kC128 := omit,
				globalCallReference := omit,
				lCLS_Configuration := omit,
				lCLS_ConnectionStatusControl := omit,
				lCLS_CorrelationNotNeeded := omit
			}
		}
	}
}

template PDU_BSSAP tr_BSSMAP_AssignmentReq modifies tr_BSSAP_BSSMAP := {
	pdu := {
		bssmap := {
			assignmentRequest := {
				messageType :='01'O,	/* overwritten */
				channelType := ?,
				layer3HeaderInfo := *,
				priority := *,
				circuitIdentityCode := ?,
				downLinkDTX_Flag := *,
				interferenceBandToBeUsed := *,
				classmarkInformationType2 := *,
				groupCallReference := *,
				talkerFlag := *,
				configurationEvolutionIndication := *,
				lsaAccesControlSuppression := *,
				serviceHandover := *,
				encryptionInformation := *,
				talkerPriority := *,
				aoIPTransportLayer := *,
				codecList := *,
				callIdentifier := *,
				kC128 := *,
				globalCallReference := *,
				lCLS_Configuration := *,
				lCLS_ConnectionStatusControl := *,
				lCLS_CorrelationNotNeeded := *
			}
		}
	}
}

template PDU_BSSAP
ts_BSSMAP_AssignmentComplete(template BSSMAP_IE_CircuitIdentityCode cic := omit,
			     template BSSMAP_IE_AoIP_TransportLayerAddress aoip := omit)
modifies ts_BSSAP_BSSMAP := {
	pdu := {
		bssmap := {
			assignmentComplete := {
				messageType :='02'O,	/* overwritten */
				rR_Cause := omit,
				circuitIdentityCode := cic,
				cellIdentifier := omit,
				chosenChannel := omit,
				chosenEncryptionAlgorithm := omit,
				circuitPool := omit,
				speechVersion := omit,
				lSAIdentifier := omit,
				talkerPriority := omit,
				aoIPTransportLayer := aoip,
				speechCodec := omit,
				codecList := omit,
				lCLS_BSS_Status := omit
			}
		}
	}
}

template PDU_BSSAP tr_BSSMAP_AssignmentComplete(template BSSMAP_IE_CircuitIdentityCode cic := *,
						template BSSMAP_IE_AoIP_TransportLayerAddress aoip := *)
modifies tr_BSSAP_BSSMAP := {
	pdu := {
		bssmap := {
			assignmentComplete := {
				messageType := '02'O,	/* overwritten */
				rR_Cause := *,
				circuitIdentityCode := cic,
				cellIdentifier := *,
				chosenChannel := *,
				chosenEncryptionAlgorithm := *,
				circuitPool := *,
				speechVersion := *,
				lSAIdentifier := *,
				talkerPriority := *,
				aoIPTransportLayer := aoip,
				speechCodec := *,
				codecList := *,
				lCLS_BSS_Status := *
			}
		}
	}
}

template PDU_BSSAP tr_BSSMAP_AssignmentFail modifies tr_BSSAP_BSSMAP := {
	pdu := {
		bssmap := {
			assignmentFailure := {
				messageType := '03'O,	/* overwritten */
				rR_Cause := *,
				circuitPool := *,
				circuitPoolList := *,
				talkerPriority := *,
				codecList := *
			}
		}
	}
}


template (value) PDU_BSSAP ts_BSSMAP_ClearCommand(BssmapCause cause)
modifies ts_BSSAP_BSSMAP := {
	pdu := {
		bssmap := {
			clearCommand := {
				messageType := '20'O,	/* overwritten */
				layer3HeaderInfo := omit,
				cause := ts_BSSMAP_IE_Cause(cause),
				cSFB_Indication := omit
			}
		}
	}
}

template PDU_BSSAP tr_BSSMAP_ClearCommand modifies tr_BSSAP_BSSMAP := {
	pdu := {
		bssmap := {
			clearCommand := {
				messageType := '20'O,	/* overwritten */
				layer3HeaderInfo := *,
				cause := ?,
				cSFB_Indication := *
			}
		}
	}
}

template (value) PDU_BSSAP ts_BSSMAP_ClearComplete
modifies ts_BSSAP_BSSMAP := {
	pdu := {
		bssmap := {
			clearComplete := {
				messageType := '21'O	/* overwritten */
			}
		}
	}
}

template PDU_BSSAP tr_BSSMAP_ClearComplete modifies tr_BSSAP_BSSMAP := {
	pdu := {
		bssmap := {
			clearComplete := {
				messageType := '21'O
			}
		}
	}
}

template PDU_BSSAP tr_BSSMAP_ClearRequest modifies tr_BSSAP_BSSMAP := {
	pdu := {
		bssmap := {
			clearRequest := {
				messageType := '22'O,	/* overwritten */
				cause := ?
			}
		}
	}
}


function f_hex_is_odd_length(hexstring digits) return bitstring {
	if (lengthof(digits) rem 2 == 1) {
		return '1'B;
	} else {
		return '0'B;
	}
}

template BSSMAP_IE_IMSI ts_BSSMAP_Imsi(hexstring imsi_digits) := {
	elementIdentifier := '08'O,
	lengthIndicator := 0, /* overwritten */
	typeOfIdentity := '001'B, /* IMSI */
	oddEvenIndicator := f_hex_is_odd_length(imsi_digits),
	digits := imsi_digits
}

template BSSMAP_FIELD_CellIdentificationList ts_BSSMAP_CIL_noCell := {
	cIl_noCell := ''O
}

private function f_enc_mcc_mnc(GsmMcc mcc, GsmMnc mnc) return OCT3 {
	return hex2oct(mcc[1] & mcc[0] & mnc[0] & mnc[2] & mnc[1]);
}

template BSSMAP_FIELD_CellIdentification_CGI ts_BSSMAP_CI_CGI(GsmMcc mcc, GsmMnc mnc, GsmLac lac, GsmCellId ci) := {
	mcc_mnc := f_enc_mcc_mnc(mcc, mnc),
	lac := int2oct(lac, 2),
	ci := int2oct(ci, 2)
}

template BSSMAP_FIELD_CellIdentification_LAC_CI ts_BSSMAP_CI_LAC_CI(GsmLac lac, GsmCellId ci) := {
	lac := int2oct(lac, 2),
	ci := int2oct(ci, 2)
}

template BSSMAP_FIELD_CellIdentification_LAI ts_BSSMAP_CI_LAI(GsmMcc mcc, GsmMnc mnc, GsmLac lac) := {
	mcc_mnc := f_enc_mcc_mnc(mcc, mnc),
	lac := int2oct(lac, 2)
}

template OCT2 ts_BSSMAP_CI_CI(GsmCellId ci) := int2oct(ci, 2);
template OCT2 ts_BSSMAP_CI_LAC(GsmLac lac) := int2oct(lac, 2);

template BSSMAP_IE_ChannelNeeded ts_BSSMAP_IE_ChanNeeded(BIT2 chneed) := {
	elementIdentifier := '24'O,
	channel := chneed,
	spare := '000000'B
}

template BSSMAP_IE_TMSI ts_BSSMAP_IE_TMSI(OCT4 tmsi) := {
	elementIdentifier := '09'O,
	lengthIndicator := 4,
	tmsiOctets := tmsi
};

private function f_tmsi_or_omit(template OCT4 tmsi) return template BSSMAP_IE_TMSI {
	var template BSSMAP_IE_TMSI ret;
	if (ispresent(tmsi)) {
		ret := ts_BSSMAP_IE_TMSI(valueof(tmsi));
	} else {
		ret := omit;
	}
	return ret;
}

template PDU_BSSAP ts_BSSMAP_Paging(hexstring imsi_digits,
					template BSSMAP_FIELD_CellIdentificationList cid_list,
					template OCT4 tmsi := omit,
					template BSSMAP_IE_ChannelNeeded chneed := omit)
modifies ts_BSSAP_BSSMAP := {
	pdu := {
		bssmap := {
			paging := {
				messageType := '51'O,
				iMSI := ts_BSSMAP_Imsi(imsi_digits),
				tMSI := f_tmsi_or_omit(tmsi),
				cellIdentifierList := ts_BSSMAP_IE_CidList(valueof(cid_list)),
				channelNeeded := chneed,
				eMLPP_Priority := omit,
				pagingInformation := omit /* only VGCS/VBS flag */
			}
		}
	}
}


} with { encode "RAW" };