module RSL_Types {

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

	/* Section 9.1 */
	type enumerated RSL_MessageGroup {
		RSL_MDISC_RESERVED	('0000000'B),
		RSL_MDISC_RLL		('0000001'B),
		RSL_MDISC_DCHAN		('0000100'B),
		RSL_MDISC_CCHAN		('0000110'B),
		RSL_MDISC_TRX_MGMT	('0001000'B),
		RSL_MDISC_LCS		('0010000'B),
		RSL_MDISC_IPACCESS	('0111111'B)
	} with { variant "FIELDLENGTH(7)" };

	/* Section 9.1 */
	type record RSL_MessageDiscriminator {
		RSL_MessageGroup	msg_group,
		boolean			transparent
	} with { variant "FIELDORDER(msb)" };

	template RSL_MessageDiscriminator ts_RSL_MsgDisc(RSL_MessageGroup mg, boolean t := true) := {
		msg_group := mg,
		transparent := t
	}

	/* Section 9.2 */
	type enumerated RSL_MessageType {
		/* Radio Link Layer Management */
		RSL_MT_DATA_REQ		('00000001'B),
		RSL_MT_DATA_IND		('00000010'B),
		RSL_MT_ERROR_IND	('00000011'B),
		RSL_MT_EST_REQ		('00000100'B),
		RSL_MT_EST_CONF		('00000101'B),
		RSL_MT_EST_IND		('00000110'B),
		RSL_MT_REL_REQ		('00000111'B),
		RSL_MT_REL_CONF		('00001000'B),
		RSL_MT_REL_IND		('00001001'B),
		RSL_MT_UNIT_DATA_REQ	('00001010'B),
		RSL_MT_UNIT_DATA_IND	('00001011'B),

		/* non-standard below */
		RSL_MT_SUSP_REQ		('00001100'B),
		RSL_MT_SUSP_CONF	('00001101'B),
		RSL_MT_RES_REQ		('00001110'B),
		RSL_MT_RECON_REQ	('00001111'B),

		/* Common Channel Management / TRX Management */
		RSL_MT_BCCH_INFO	('00010001'B),
		RSL_MT_CCCH_LOAD_IND	('00010010'B),
		RSL_MT_CHAN_RQD		('00010011'B),
		RSL_MT_DELETE_IND	('00010100'B),
		RSL_MT_PAGING_CMD	('00010101'B),
		RSL_MT_IMMEDIATE_ASSIGN_CMD ('00010110'B),
		RSL_MT_SMS_BC_REQ	('00010111'B),
		RSL_MT_CHAN_CONF	('00011000'B),	/* non-standard element */
		/* empty */
		RSL_MT_RF_RES_IND	('00011001'B),
		RSL_MT_SACCH_FILL	('00011010'B),
		RSL_MT_OVERLOAD		('00011011'B),
		RSL_MT_ERROR_REPORT	('00011100'B),
		RSL_MT_SMS_BC_CMD	('00011101'B),
		RSL_MT_CBCH_LOAD_IND	('00011110'B),
		RSL_MT_NOT_CMD		('00011111'B),

		/* Dedicate Channel Management */
		RSL_MT_CHAN_ACTIV	('00100001'B),
		RSL_MT_CHAN_ACTIV_ACK	('00100010'B),
		RSL_MT_CHAN_ACTIV_NACK	('00100011'B),
		RSL_MT_CONN_FAIL	('00100100'B),
		RSL_MT_DEACTIVATE_SACCH	('00100101'B),
		RSL_MT_ENCR_CMD		('00100110'B),
		RSL_MT_HANDO_DET	('00100111'B),
		RSL_MT_MEAS_RES		('00101000'B),
		RSL_MT_MODE_MODIFY_REQ	('00101001'B),
		RSL_MT_MODE_MODIFY_ACK	('00101010'B),
		RSL_MT_MODE_MODIFY_NACK	('00101011'B),
		RSL_MT_PHY_CONTEXT_REQ	('00101100'B),
		RSL_MT_PHY_CONTEXT_CONF	('00101101'B),
		RSL_MT_RF_CHAN_REL	('00101110'B),
		RSL_MT_MS_POWER_CONTROL ('00101111'B),
		RSL_MT_BS_POWER_CONTROL	('00110000'B),		/* 0x30 */
		RSL_MT_PREPROC_CONFIG	('00110001'B),
		RSL_MT_PREPROC_MEAS_RES	('00110010'B),
		RSL_MT_RF_CHAN_REL_ACK	('00110011'B),
		RSL_MT_SACCH_INFO_MODIFY('00110100'B),
		RSL_MT_TALKER_DET	('00110101'B),
		RSL_MT_LISTENER_DET	('00110110'B),
		RSL_MT_REMOTE_CODEC_CONF_REP ('00110111'B),
		RSL_MT_RTD_REP		('00111000'B),
		RSL_MT_PRE_HANDO_NOTIF	('00111001'B),
		RSL_MT_MR_CODEC_MOD_REQ	('00111010'B),
		RSL_MT_MR_CODEC_MOD_ACK	('00111011'B),
		RSL_MT_MR_CODEC_MOD_NACK ('00111100'B),
		RSL_MT_MR_CODEC_MOD_PER	('00111101'B),
		RSL_MT_TFO_REP		('00111110'B),
		RSL_MT_TFO_MOD_REQ	('00111111'B),		/* 0x3f */

		RSL_MT_LOCATION_INFO		('01000001'B),

		/* ip.access specific RSL message types */
		RSL_MT_IPAC_DIR_RETR_ENQ	('01000000'B),

		RSL_MT_IPAC_PDCH_ACT		('01001000'B),
		RSL_MT_IPAC_PDCH_ACT_ACK	('01001001'B),
		RSL_MT_IPAC_PDCH_ACT_NACK	('01001010'B),
		RSL_MT_IPAC_PDCH_DEACT		('01001011'B),
		RSL_MT_IPAC_PDCH_DEACT_ACK	('01001100'B),
		RSL_MT_IPAC_PDCH_DEACT_NACK	('01001101'B),

		RSL_MT_IPAC_CONNECT_MUX		('01010000'B),
		RSL_MT_IPAC_CONNECT_MUX_ACK,
		RSL_MT_IPAC_CONNECT_MUX_NACK,
		RSL_MT_IPAC_BIND_MUX,
		RSL_MT_IPAC_BIND_MUX_ACK,
		RSL_MT_IPAC_BIND_MUX_NACK,
		RSL_MT_IPAC_DISC_MUX,
		RSL_MT_IPAC_DISC_MUX_ACK,
		RSL_MT_IPAC_DISC_MUX_NACK,
		RSL_MT_IPAC_MEAS_PREPROC_DFT 	('01100000'B),
		RSL_MT_IPAC_HO_CAN_ENQ,
		RSL_MT_IPAC_HO_CAN_RES,
		RSL_MT_IPAC_CRCX,
		RSL_MT_IPAC_CRCX_ACK,
		RSL_MT_IPAC_CRCX_NACK,
		RSL_MT_IPAC_MDCX,
		RSL_MT_IPAC_MDCX_ACK,
		RSL_MT_IPAC_MDCX_NACK,
		RSL_MT_IPAC_DLCX_IND,
		RSL_MT_IPAC_DLCX,
		RSL_MT_IPAC_DLCX_ACK,
		RSL_MT_IPAC_DLCX_NACK
	} with { variant "FIELDLENGTH(8)" };

	/*! RSL Information Element Identifiers (Chapter 9.3) */
	type enumerated RSL_IE_Type {
		RSL_IE_CHAN_NR			('00000001'B),
		RSL_IE_LINK_IDENT		('00000010'B),
		RSL_IE_ACT_TYPE			('00000011'B),
		RSL_IE_BS_POWER			('00000100'B),
		RSL_IE_CHAN_IDENT		('00000101'B),
		RSL_IE_CHAN_MODE		('00000110'B),
		RSL_IE_ENCR_INFO		('00000111'B),
		RSL_IE_FRAME_NUMBER		('00001000'B),
		RSL_IE_HANDO_REF		('00001001'B),
		RSL_IE_L1_INFO			('00001010'B),
		RSL_IE_L3_INFO			('00001011'B),
		RSL_IE_MS_IDENTITY		('00001100'B),
		RSL_IE_MS_POWER			('00001101'B),
		RSL_IE_PAGING_GROUP		('00001110'B),
		RSL_IE_PAGING_LOAD		('00001111'B),
		RSL_IE_PYHS_CONTEXT		('00010000'B),
		RSL_IE_ACCESS_DELAY		('00010001'B),
		RSL_IE_RACH_LOAD		('00010010'B),
		RSL_IE_REQ_REFERENCE		('00010011'B),
		RSL_IE_RELEASE_MODE		('00010100'B),
		RSL_IE_RESOURCE_INFO		('00010101'B),
		RSL_IE_RLM_CAUSE		('00010110'B),
		RSL_IE_STARTNG_TIME		('00010111'B),
		RSL_IE_TIMING_ADVANCE		('00011000'B),
		RSL_IE_UPLINK_MEAS		('00011001'B),
		RSL_IE_CAUSE			('00011010'B),
		RSL_IE_MEAS_RES_NR		('00011011'B),
		RSL_IE_MSG_ID			('00011100'B),
		/* reserved */
		RSL_IE_SYSINFO_TYPE		('00011110'B),
		RSL_IE_MS_POWER_PARAM		('00011111'B),
		RSL_IE_BS_POWER_PARAM		('00100000'B),
		RSL_IE_PREPROC_PARAM		('00100001'B),
		RSL_IE_PREPROC_MEAS		('00100010'B),
		RSL_IE_IMM_ASS_INFO		('00100011'B),/* Phase 1 (3.6.0), later Full below */
		RSL_IE_SMSCB_INFO		('00100100'B),
		RSL_IE_MS_TIMING_OFFSET		('00100101'B),
		RSL_IE_ERR_MSG			('00100110'B),
		RSL_IE_FULL_BCCH_INFO		('00100111'B),
		RSL_IE_CHAN_NEEDED		('00101000'B),
		RSL_IE_CB_CMD_TYPE		('00101001'B),
		RSL_IE_SMSCB_MSG		('00101010'B),
		RSL_IE_FULL_IMM_ASS_INFO	('00101011'B),
		RSL_IE_SACCH_INFO		('00101100'B),
		RSL_IE_CBCH_LOAD_INFO		('00101101'B),
		RSL_IE_SMSCB_CHAN_INDICATOR	('00101110'B),
		RSL_IE_GROUP_CALL_REF		('00101111'B),
		RSL_IE_CHAN_DESC		('00110000'B),
		RSL_IE_NCH_DRX_INFO		('00110001'B),
		RSL_IE_CMD_INDICATOR		('00110010'B),
		RSL_IE_EMLPP_PRIO		('00110011'B),
		RSL_IE_UIC			('00110100'B),
		RSL_IE_MAIN_CHAN_REF		('00110101'B),
		RSL_IE_MR_CONFIG		('00110110'B),
		RSL_IE_MR_CONTROL		('00110111'B),
		RSL_IE_SUP_CODEC_TYPES		('00111000'B),
		RSL_IE_CODEC_CONFIG		('00111001'B),
		RSL_IE_RTD			('00111010'B),
		RSL_IE_TFO_STATUS		('00111011'B),
		RSL_IE_LLP_APDU			('00111100'B),

		/* ip.access */
		RSL_IE_IPAC_SRTP_CONFIG		('11100000'B),
		RSL_IE_IPAC_PROXY_UDP		('11100001'B),
		RSL_IE_IPAC_BSCMPL_TOUT		('11100010'B),

		RSL_IE_IPAC_REMOTE_IP		('11110000'B),
		RSL_IE_IPAC_REMOTE_PORT		('11110001'B),
		RSL_IE_IPAC_RTP_PAYLOAD		('11110010'B),
		RSL_IE_IPAC_LOCAL_PORT		('11110011'B),
		RSL_IE_IPAC_SPEECH_MODE		('11110100'B),
		RSL_IE_IPAC_LOCAL_IP		('11110101'B),
		RSL_IE_IPAC_CONN_STAT		('11110110'B),
		RSL_IE_IPAC_HO_C_PARMS		('11110111'B),
		RSL_IE_IPAC_CONN_ID		('11111000'B),
		RSL_IE_IPAC_RTP_CSD_FMT		('11111001'B),
		RSL_IE_IPAC_RTP_JIT_BUF		('11111010'B),
		RSL_IE_IPAC_RTP_COMPR		('11111011'B),
		RSL_IE_IPAC_RTP_PAYLOAD2	('11111100'B),
		RSL_IE_IPAC_RTP_MPLEX		('11111101'B),
		RSL_IE_IPAC_RTP_MPLEX_ID	('11111110'B)
	} with { variant "FIELDLENGTH(8)" };

	type record RSL_LV {
		uint8_t		len,
		octetstring	payload
	} with { variant (len) "LENGTHTO(payload)" }

	template RSL_LV ts_RSL_LV(template octetstring pl) := {
		len := 0,
		payload := pl
	}

	template RSL_LV tr_RSL_LV(template octetstring pl) := {
		len := ?,
		payload := pl
	}

	type record RSL_L16V {
		uint16_t	len,
		octetstring	payload
	} with { variant (len) "LENGTHTO(payload)" }

	template RSL_L16V ts_RSL_L16V(template octetstring pl) := {
		len := 0,
		payload := pl
	}

	type record RSL_IE_V {
		uint8_t		val
	}

	/* 9.3.3 */
	type record RSL_IE_ActivationType {
		boolean		reactivation,
		uint4_t		reserved,
		uint3_t		a_bits
	}

	template RSL_IE_ActivationType t_RSL_IE_ActType := {
		reactivation := false,
		reserved := 0,
		a_bits := 0 /* related to immediate assignment */
	}

	/* 9.3.6 */
	type enumerated RSL_SpeechDataInd {
		RSL_SPDI_SPEECH		('00000001'B),
		RSL_SPDI_DATA		('00000010'B),
		RSL_SPDI_SIGN		('00000011'B)
	} with { variant "FIELDLENGTH(8)" };
	type enumerated RSL_ChanRateType {
		RSL_CHRT_SDCCH		('00000001'B),
		RSL_CHRT_TCH_F		('00001000'B),
		RSL_CHRT_TCH_H		('00001001'B),
		RSL_CHRT_TCH_F_BD_MSLOT	('00001010'B),
		RSL_CHRT_TCH_F_DL_MSLOT	('00011010'B),
		RSL_CHRT_TCH_F_GROUP	('00011000'B),
		RSL_CHRT_TCH_H_GROUP	('00011001'B),
		RSL_CHRT_TCH_F_BCAST	('00101000'B),
		RSL_CHRT_TCH_H_BCAST	('00101001'B)
	} with { variant "FIELDLENGTH(8)" };
	type enumerated RSL_SpeechAlgo {
		RSL_CMOD_NO_RESOURCE	('00000000'B),
		RSL_CMOD_SP_GSM1	('00000001'B),
		RSL_CMOD_SP_GSM2	('00010001'B),
		RSL_CMOD_SP_GSM3	('00100001'B),
		RSL_CMOD_SP_GSM4	('00110001'B),
		RSL_CMOD_SP_GSM5	('00001001'B),
		RSL_CMOD_SP_GSM6	('00001101'B)
	} with { variant "FIELDLENGTH(8)" };
	type record RSL_IE_ChannelMode {
		uint8_t		len,
		BIT6		reserved,
		boolean		dtx_d,
		boolean		dtx_u,
		RSL_SpeechDataInd spd_ind,
		RSL_ChanRateType  ch_rate_type,
		RSL_SpeechAlgo	coding_alg_rate
	} with { variant (len) "LENGTHTO(reserved,dtx_d,dtx_u,spd_ind,ch_rate_type,coding_alg_rate)" }

	template RSL_IE_ChannelMode ts_RSL_ChanMode_SIGN := {
		len := 0,	/* overwritten */
		reserved := '000000'B,
		dtx_d := false,
		dtx_u := false,
		spd_ind := RSL_SPDI_SIGN,
		ch_rate_type := RSL_CHRT_SDCCH,
		coding_alg_rate := RSL_CMOD_NO_RESOURCE
	}

	template RSL_IE_ChannelMode ts_RSL_ChanMode(RSL_ChanRateType t, RSL_SpeechAlgo alg) := {
		len := 0,	/* overwritten */
		reserved := '000000'B,
		dtx_d := false,
		dtx_u := false,
		spd_ind := RSL_SPDI_SPEECH,
		ch_rate_type := t,
		coding_alg_rate := alg
	}

	/* 9.3.4 */
	type record RSL_IE_BS_Power {
		uint1_t 	reserved,
		boolean		epc,
		boolean		fpc,
		uint5_t		power_level
	}

	/* 9.3.8 */
	type record RSL_IE_FrameNumber {
		uint5_t		t1_p,
		uint6_t		t3,
		uint5_t		t2
	}
	type RSL_IE_FrameNumber RSL_IE_StartingTime;

	/* 9.3.10 */
	type record RSL_IE_L1Info {
		uint5_t		ms_power_lvl,
		boolean		fpc,
		uint2_t		reserved,
		uint8_t		actual_ta
	}

	/* 9.3.13 */
	type record RSL_IE_MS_Power {
		uint2_t		reserved,
		boolean		fpc_epc,
		uint5_t		power_level
	}

	/* 9.3.18 */
	type record RSL_IE_RachLoad {
		uint8_t		len,
		uint16_t	slot_count,
		uint16_t	busy_count,
		uint16_t	access_count
	} with { variant (len) "LENGTHTO(slot_count,busy_count,access_count)" }

	template RSL_IE_RachLoad ts_RSL_IE_RachLoad(uint16_t slot, uint16_t busy, uint16_t acc) := {
		len := 0, /* overwritten */
		slot_count := slot,
		busy_count := busy,
		access_count := acc
	}

	/* 9.3.19 */
	type record RSL_IE_RequestRef {
		OCT1		ra,
		RSL_IE_FrameNumber frame_nr
	}

	/* 3GPP TS 44.018 / 10.5.2.38 Starting Time */
	template RSL_IE_FrameNumber ts_RSL_IE_FrameNumber(GsmFrameNumber fn) := {
		t1_p := (fn / 1326) mod 32,
		t3 := fn mod 51,
		t2 := fn mod 26
	}

	template RSL_IE_RequestRef ts_RSL_IE_ReqRef(OCT1 ra, GsmFrameNumber frame_nr) := {
		ra := ra,
		frame_nr := ts_RSL_IE_FrameNumber(frame_nr)
	}

	/* 9.3.26 */
	type enumerated RSL_Cause {
		/* normal event */
		RSL_ERR_RADIO_IF_FAIL		('00'O),
		RSL_ERR_RADIO_LINK_FAIL		('01'O),
		RSL_ERR_HANDOVER_ACC_FAIL	('02'O),
		RSL_ERR_TALKER_ACC_FAIL		('03'O),
		RSL_ERR_OM_INTERVENTION		('07'O),
		RSL_ERR_NORMAL_UNSPEC		('0f'O),
		RSL_ERR_T_MSRFPCI_EXP		('18'O),
		/* resource unavailable */
		RSL_ERR_EQUIPMENT_FAIL		('20'O),
		RSL_ERR_RR_UNAVAIL		('21'O),
		RSL_ERR_TERR_CH_FAIL		('22'O),
		RSL_ERR_CCCH_OVERLOAD		('23'O),
		RSL_ERR_ACCH_OVERLOAD		('24'O),
		RSL_ERR_PROCESSOR_OVERLOAD	('25'O),
		RSL_ERR_BTS_NOT_EQUIPPED	('27'O),
		RSL_ERR_REMOTE_TRAU_FAILURE	('28'O),
		RSL_ERR_NOTIF_OVERFLOW		('29'O),
		RSL_ERR_RES_UNAVAIL		('2f'O),
		/* service or option not available */
		RSL_ERR_TRANSC_UNAVAIL		('30'O),
		RSL_ERR_SERV_OPT_UNAVAIL	('3f'O),
		/* service or option not implemented */
		RSL_ERR_ENCR_UNIMPL		('40'O),
		RSL_ERR_SERV_OPT_UNIMPL		('4f'O),
		/* invalid message */
		RSL_ERR_RCH_ALR_ACTV_ALLOC	('50'O),
		RSL_ERR_INVALID_MESSAGE		('5f'O),
		/* protocol error */
		RSL_ERR_MSG_DISCR		('60'O),
		RSL_ERR_MSG_TYPE		('61'O),
		RSL_ERR_MSG_SEQ			('62'O),
		RSL_ERR_IE_ERROR		('63'O),
		RSL_ERR_MAND_IE_ERROR		('64'O),
		RSL_ERR_OPT_IE_ERROR		('65'O),
		RSL_ERR_IE_NONEXIST		('66'O),
		RSL_ERR_IE_LENGTH		('67'O),
		RSL_ERR_IE_CONTENT		('68'O),
		RSL_ERR_PROTO			('6f'O),
		/* interworking */
		RSL_ERR_INTERWORKING		('7f'O)
	};
	type record RSL_IE_Cause {
		uint8_t		len,
		uint1_t		e,
		RSL_Cause	cause,
		octetstring	cause_ext optional
	} with { variant (len) "LENGTHTO(e,cause,cause_ext)" }

	template RSL_IE_Cause ts_RSL_IE_Cause(RSL_Cause cause) := {
		len := 0, /* overwritten */
		e := 0,
		cause := cause,
		cause_ext := omit
	}

	/* 9.3.40 */
	type enumerated RSL_ChanNeeded {
		RSL_CHANNEED_ANY	('00'B),
		RSL_CHANNEED_SDCCH	('01'B),
		RSL_CHANNEED_TCH_F	('10'B),
		RSL_CHANNEED_TCH_ForH	('11'B)
	} with { variant "FIELDLENGTH(2)" };
	type record RSL_IE_ChanNeeded {
		uint6_t		reserved,
		RSL_ChanNeeded	chan_needed
	}

	/* 9.3.53 */
	type record RSL_IE_MultirateCtrl {
		uint3_t		spare,
		boolean		od,
		boolean		pre,
		uint2_t		rae,
		boolean		tfo
	}

	type enumerated RSL_IE_SysinfoType {
		RSL_SYSTEM_INFO_8	('00000000'B),
		RSL_SYSTEM_INFO_1	('00000001'B),
		RSL_SYSTEM_INFO_2	('00000010'B),
		RSL_SYSTEM_INFO_3	('00000011'B),
		RSL_SYSTEM_INFO_4	('00000100'B),
		RSL_SYSTEM_INFO_5	('00000101'B),
		RSL_SYSTEM_INFO_6	('00000110'B),
		RSL_SYSTEM_INFO_7	('00000111'B),
		RSL_SYSTEM_INFO_16	('00001000'B),
		RSL_SYSTEM_INFO_17	('00001001'B),
		RSL_SYSTEM_INFO_2bis	('00001010'B),
		RSL_SYSTEM_INFO_2ter	('00001011'B),
		RSL_SYSTEM_INFO_5bis	('00001101'B),
		RSL_SYSTEM_INFO_5ter	('00001110'B),
		RSL_SYSTEM_INFO_10	('00001111'B),
		RSL_EXT_MEAS_ORDER	('01000111'B),
		RSL_MEAS_INFO		('01001000'B),
		RSL_SYSTEM_INFO_13	('00101000'B),
		RSL_ERIC_SYSTEM_INFO_13 ('00001100'B),
		RSL_SYSTEM_INFO_2quater ('00101001'B),
		RSL_SYSTEM_INFO_9	('00101010'B),
		RSL_SYSTEM_INFO_18	('00101011'B),
		RSL_SYSTEM_INFO_19	('00101100'B),
		RSL_SYSTEM_INFO_20	('00101101'B)
	} with { variant "FIELDLENGTH(8)" }

	/* union of all IE bodies */
	type union RSL_IE_Body {
		RslChannelNr		chan_nr,
		RslLinkId		link_id,
		RSL_L16V		l3_info,
		RSL_LV			rlm_cause,
		uint8_t			release_mode,
		RSL_IE_ActivationType	act_type,
		RSL_IE_ChannelMode	chan_mode,
		uint8_t			handover_ref,
		RSL_IE_BS_Power		bs_power,
		RSL_IE_MS_Power		ms_power,
		uint8_t			timing_adv,
		RSL_IE_MultirateCtrl	multirate_ctrl,
		RSL_IE_FrameNumber	frame_nr,
		RSL_IE_Cause		cause,
		uint8_t			access_delay,
		RSL_IE_RachLoad		rach_load,
		uint8_t			meas_res_nr,
		RSL_IE_L1Info		l1_info,
		RSL_IE_SysinfoType	sysinfo_type,
		uint16_t		paging_load,
		uint8_t			paging_group,
		RSL_IE_ChanNeeded	chan_needed,
		RSL_IE_StartingTime	starting_time,
		RSL_IE_RequestRef	req_ref,
		RSL_LV			full_imm_ass_info,
		RSL_LV			ms_identity,

		RSL_LV		other
	}

	type record RSL_IE {
		RSL_IE_Type	iei,
		RSL_IE_Body	body
	} with { variant (body) "CROSSTAG(
					chan_nr, iei = RSL_IE_CHAN_NR;
					link_id, iei = RSL_IE_LINK_IDENT;
					l3_info, iei = RSL_IE_L3_INFO;
					rlm_cause, iei = RSL_IE_RLM_CAUSE;
					release_mode, iei = RSL_IE_RELEASE_MODE;
					act_type, iei = RSL_IE_ACT_TYPE;
					chan_mode, iei = RSL_IE_CHAN_MODE;
					handover_ref, iei = RSL_IE_HANDO_REF;
					bs_power, iei = RSL_IE_BS_POWER;
					ms_power, iei = RSL_IE_MS_POWER;
					timing_adv, iei = RSL_IE_TIMING_ADVANCE;
					multirate_ctrl, iei = RSL_IE_MR_CONTROL;

					frame_nr, iei = RSL_IE_FRAME_NUMBER;
					cause, iei = RSL_IE_CAUSE;
					access_delay, iei = RSL_IE_ACCESS_DELAY;
					rach_load, iei = RSL_IE_RACH_LOAD;
					meas_res_nr, iei = RSL_IE_MEAS_RES_NR;
					l1_info, iei = RSL_IE_L1_INFO;
					sysinfo_type, iei = RSL_IE_SYSINFO_TYPE;
					paging_load, iei = RSL_IE_PAGING_LOAD;
					paging_group, iei = RSL_IE_PAGING_GROUP;
					chan_needed, iei = RSL_IE_CHAN_NEEDED;
					starting_time, iei = RSL_IE_STARTNG_TIME;

					req_ref, iei = RSL_IE_REQ_REFERENCE;
					full_imm_ass_info, iei = RSL_IE_FULL_IMM_ASS_INFO;
					ms_identity, iei =  RSL_IE_MS_IDENTITY;
					other, iei = RSL_IE_FULL_BCCH_INFO;

					other, OTHERWISE;
		)" };

	/* For some reason the TTCN-3 RAW codec cannot automatically figure out the IEI
	 * that it needs to set for a given union-choice (body).  So we have to explicitly
	 * specify the IEI by the caller :( */
	template RSL_IE t_RSL_IE(RSL_IE_Type iei, template RSL_IE_Body body) := {
		iei := iei,
		body := body
	}

	template RSL_IE tr_RSL_IE(template RSL_IE_Body body) := {
		iei := ?, /* overwritten? */
		body := body
	}


	type record of RSL_IE RSL_IE_List;

	type record RSL_Message {
		RSL_MessageDiscriminator	msg_disc,
		RSL_MessageType			msg_type,
		RSL_IE_List			ies optional
	}

	external function enc_RSL_Message(in RSL_Message msg) return octetstring
		with { extension "prototype(convert) encode(RAW)" };
	external function dec_RSL_Message(in octetstring stream) return RSL_Message
		with { extension "prototype(convert) decode(RAW)" };

	template RSL_Message tr_RSL_MsgDiscType(template RSL_MessageDiscriminator m_disc,
				RSL_MessageType m_type) := {
		msg_disc := m_disc,
		msg_type := m_type,
		ies := *
	}

	template RSL_Message ts_RSL_MsgDiscType(template RSL_MessageDiscriminator m_disc,
						template RSL_MessageType msg_type,
						template RSL_IE_List ies := omit) := {
		msg_disc := m_disc,
		msg_type := msg_type,
		ies := ies
	}

template RSL_Message tr_RSL_MsgType(template RSL_MessageType msg_type) := {
	msg_disc := ?,
	msg_type := msg_type,
	ies := *
}

/* Common Channel Management */
template RSL_Message tr_RSL_MsgTypeC(template RSL_MessageType msg_type) modifies tr_RSL_MsgType := {
	msg_disc := { RSL_MDISC_CCHAN, ? }
}

/* RLL */
template RSL_Message tr_RSL_MsgTypeR(template RSL_MessageType msg_type) modifies tr_RSL_MsgType := {
	msg_disc := { RSL_MDISC_RLL, true }
}

/* Dedicated Channel Management */
template RSL_Message tr_RSL_MsgTypeD(template RSL_MessageType msg_type) modifies tr_RSL_MsgType := {
	msg_disc := { RSL_MDISC_DCHAN, ? }
}

/* Dedicated Channel Management */
template RSL_Message tr_RSL_MsgTypeT(template RSL_MessageType msg_type) modifies tr_RSL_MsgType := {
	msg_disc := { RSL_MDISC_TRX_MGMT, ? }
}


/* dedicated channel or RLL */
template RSL_Message tr_RSL_MsgTypeDR(template RSL_MessageType msg_type) modifies tr_RSL_MsgType := {
	msg_disc := ({RSL_MDISC_DCHAN,?}, {RSL_MDISC_RLL,true})
}


	/* 8.3.1 BSC -> BTS */
	template RSL_Message ts_RSL_DATA_REQ(RslChannelNr chan_nr, RslLinkId link_id, octetstring l3_info) := {
		msg_disc := ts_RSL_MsgDisc(RSL_MDISC_RLL, true),
		msg_type := RSL_MT_DATA_REQ,
		ies :={
			t_RSL_IE(RSL_IE_CHAN_NR, RSL_IE_Body:{chan_nr := chan_nr}),
			t_RSL_IE(RSL_IE_LINK_IDENT, RSL_IE_Body:{link_id := link_id}),
			t_RSL_IE(RSL_IE_L3_INFO, RSL_IE_Body:{l3_info := ts_RSL_L16V(l3_info)})
		}
	}

	/* 8.3.2 BTS -> BSC */
	template RSL_Message ts_RSL_DATA_IND(RslChannelNr chan_nr, RslLinkId link_id, octetstring l3_info) := {
		msg_disc := ts_RSL_MsgDisc(RSL_MDISC_RLL, true),
		msg_type := RSL_MT_DATA_IND,
		ies :={
			t_RSL_IE(RSL_IE_CHAN_NR, RSL_IE_Body:{chan_nr := chan_nr}),
			t_RSL_IE(RSL_IE_LINK_IDENT, RSL_IE_Body:{link_id := link_id}),
			t_RSL_IE(RSL_IE_L3_INFO, RSL_IE_Body:{l3_info := ts_RSL_L16V(l3_info)})
		}
	}

	/* 8.3.3 BTS -> BSC */
	template RSL_Message ts_RSL_ERROR_IND(RslChannelNr chan_nr, RslLinkId link_id, RSL_Cause cause) := {
		msg_disc := ts_RSL_MsgDisc(RSL_MDISC_RLL, false),
		msg_type := RSL_MT_ERROR_IND,
		ies :={
			t_RSL_IE(RSL_IE_CHAN_NR, RSL_IE_Body:{chan_nr := chan_nr}),
			t_RSL_IE(RSL_IE_LINK_IDENT, RSL_IE_Body:{link_id := link_id}),
			t_RSL_IE(RSL_IE_CAUSE, RSL_IE_Body:{cause := ts_RSL_IE_Cause(cause)})
		}
	}

	/* 8.3.6 BTS -> BSC */
	template RSL_Message ts_RSL_EST_IND(RslChannelNr chan_nr, RslLinkId link_id, octetstring l3_info) := {
		msg_disc := ts_RSL_MsgDisc(RSL_MDISC_RLL, false),
		msg_type := RSL_MT_EST_IND,
		ies := {
			t_RSL_IE(RSL_IE_CHAN_NR, RSL_IE_Body:{chan_nr := chan_nr}),
			t_RSL_IE(RSL_IE_LINK_IDENT, RSL_IE_Body:{link_id := link_id}),
			t_RSL_IE(RSL_IE_L3_INFO, RSL_IE_Body:{l3_info := ts_RSL_L16V(l3_info)})
		}
	}

	/* 8.3.7 BSC -> BTS */
	template RSL_Message ts_RSL_REL_REQ(RslChannelNr chan_nr, RslLinkId link_id) := {
		msg_disc := ts_RSL_MsgDisc(RSL_MDISC_RLL, false),
		msg_type := RSL_MT_REL_REQ,
		ies :={
			t_RSL_IE(RSL_IE_CHAN_NR, RSL_IE_Body:{chan_nr := chan_nr}),
			t_RSL_IE(RSL_IE_LINK_IDENT, RSL_IE_Body:{link_id := link_id})
		}
	}
	template RSL_Message tr_RSL_REL_REQ(template RslChannelNr chan_nr,
					    template RslLinkId link_id) := {
		msg_disc := ts_RSL_MsgDisc(RSL_MDISC_RLL, false),
		msg_type := RSL_MT_REL_REQ,
		ies :={
			tr_RSL_IE(RSL_IE_Body:{chan_nr := chan_nr}),
			tr_RSL_IE(RSL_IE_Body:{link_id := link_id}),
			*
		}
	}

	/* 8.3.8 BTS -> BSC */
	template RSL_Message ts_RSL_REL_CONF(RslChannelNr chan_nr, RslLinkId link_id) := {
		msg_disc := ts_RSL_MsgDisc(RSL_MDISC_RLL, false),
		msg_type := RSL_MT_REL_CONF,
		ies :={
			t_RSL_IE(RSL_IE_CHAN_NR, RSL_IE_Body:{chan_nr := chan_nr}),
			t_RSL_IE(RSL_IE_LINK_IDENT, RSL_IE_Body:{link_id := link_id})
		}
	}

	/* 8.3.9 BTS -> BSC */
	template RSL_Message ts_RSL_REL_IND(RslChannelNr chan_nr, RslLinkId link_id) := {
		msg_disc := ts_RSL_MsgDisc(RSL_MDISC_RLL, false),
		msg_type := RSL_MT_REL_IND,
		ies :={
			t_RSL_IE(RSL_IE_CHAN_NR, RSL_IE_Body:{chan_nr := chan_nr}),
			t_RSL_IE(RSL_IE_LINK_IDENT, RSL_IE_Body:{link_id := link_id})
		}
	}

	/* 8.3.10 BSC -> BTS */
	template RSL_Message ts_RSL_UNITDATA_REQ(RslChannelNr chan_nr, RslLinkId link_id, octetstring l3_info)
	modifies ts_RSL_DATA_REQ := {
		msg_type := RSL_MT_UNIT_DATA_REQ
	}

	/* 8.3.11 BTS -> BSC */
	template RSL_Message ts_RSL_UNITDATA_IND(RslChannelNr chan_nr, RslLinkId link_id, octetstring l3_info)
	modifies ts_RSL_DATA_IND := {
		msg_type := RSL_MT_UNIT_DATA_IND
	}


	/* DEDICATED CANNEL MANAGEMENT MESSAGES */

	/* 8.4.1 BSC -> BTS */
	template RSL_Message ts_RSL_CHAN_ACT(RslChannelNr chan_nr, RSL_IE_ChannelMode mode) := {
		msg_disc := ts_RSL_MsgDisc(RSL_MDISC_DCHAN, false),
		msg_type := RSL_MT_CHAN_ACTIV,
		ies :={
			t_RSL_IE(RSL_IE_CHAN_NR, RSL_IE_Body:{chan_nr := chan_nr}),
			t_RSL_IE(RSL_IE_ACT_TYPE, RSL_IE_Body:{act_type := t_RSL_IE_ActType}),
			t_RSL_IE(RSL_IE_CHAN_MODE, RSL_IE_Body:{chan_mode := mode})
			/* lots of optional IEs */
		}
	}

	/* 8.4.2 BTS -> BSC */
	template RSL_Message ts_RSL_CHAN_ACT_ACK(RslChannelNr chan_nr, GsmFrameNumber fn) := {
		msg_disc := ts_RSL_MsgDisc(RSL_MDISC_DCHAN, false),
		msg_type := RSL_MT_CHAN_ACTIV_ACK,
		ies :={
			t_RSL_IE(RSL_IE_CHAN_NR, RSL_IE_Body:{chan_nr := chan_nr}),
			t_RSL_IE(RSL_IE_FRAME_NUMBER, RSL_IE_Body:{frame_nr := ts_RSL_IE_FrameNumber(fn)})
		}
	}

	/* 8.4.3 BTS -> BSC */
	template RSL_Message ts_RSL_CHAN_ACT_NACK(RslChannelNr chan_nr, RSL_Cause cause) := {
		msg_disc := ts_RSL_MsgDisc(RSL_MDISC_DCHAN, false),
		msg_type := RSL_MT_CHAN_ACTIV_NACK,
		ies :={
			t_RSL_IE(RSL_IE_CHAN_NR, RSL_IE_Body:{chan_nr := chan_nr}),
			t_RSL_IE(RSL_IE_CAUSE, RSL_IE_Body:{cause := ts_RSL_IE_Cause(cause)})
		}
	}

	/* 8.4.4 BTS -> BSC */
	template RSL_Message ts_RSL_CONN_FAIL_IND(RslChannelNr chan_nr, RSL_Cause cause) := {
		msg_disc := ts_RSL_MsgDisc(RSL_MDISC_DCHAN, false),
		msg_type := RSL_MT_CONN_FAIL,
		ies :={
			t_RSL_IE(RSL_IE_CHAN_NR, RSL_IE_Body:{chan_nr := chan_nr}),
			t_RSL_IE(RSL_IE_CAUSE, RSL_IE_Body:{cause := ts_RSL_IE_Cause(cause)})
		}
	}

	/* 8.4.5 BSC -> BTS */
	template RSL_Message tr_RSL_DEACT_SACCH(template RslChannelNr chan_nr) := {
		msg_disc := ts_RSL_MsgDisc(RSL_MDISC_DCHAN, false),
		msg_type := RSL_MT_DEACTIVATE_SACCH,
		ies := {
			tr_RSL_IE(RSL_IE_Body:{chan_nr := chan_nr})
		}
	}

	/* 8.4.11 BTS -> BSC */
	template RSL_Message ts_RSL_MODE_MODIFY_NACK(RslChannelNr chan_nr, RSL_Cause cause)
	modifies ts_RSL_CHAN_ACT_NACK := {
		msg_type := RSL_MT_MODE_MODIFY_NACK
	}

	/* 8.4.19 BTS -> BSC */
	template RSL_Message ts_RSL_RF_CHAN_REL_ACK(RslChannelNr chan_nr) :=
		ts_RSL_MsgDiscType(ts_RSL_MsgDisc(RSL_MDISC_DCHAN, false),
				   RSL_MT_RF_CHAN_REL_ACK,
				   { t_RSL_IE(RSL_IE_CHAN_NR, RSL_IE_Body:{chan_nr := chan_nr}) });

	/* COMMON CHANNEL MANAGEMENT MESSAGES */

	/* 8.5.2 BTS -> BSC */
	template RSL_Message ts_RSL_RACH_LOAD_IND(uint16_t slot_ct, uint16_t busy_ct, uint16_t acc_ct) := {
		msg_disc := ts_RSL_MsgDisc(RSL_MDISC_CCHAN, false),
		msg_type := RSL_MT_CCCH_LOAD_IND,
		ies := {
			t_RSL_IE(RSL_IE_CHAN_NR, RSL_IE_Body:{chan_nr := t_RslChanNr_RACH(0)}),
			t_RSL_IE(RSL_IE_RACH_LOAD, RSL_IE_Body:{rach_load := ts_RSL_IE_RachLoad(slot_ct, busy_ct, acc_ct)})
		}
	}
	template RSL_Message ts_RSL_PAGING_LOAD_IND(uint16_t buffer_space) := {
		msg_disc := ts_RSL_MsgDisc(RSL_MDISC_CCHAN, false),
		msg_type := RSL_MT_CCCH_LOAD_IND,
		ies := {
			t_RSL_IE(RSL_IE_CHAN_NR, RSL_IE_Body:{chan_nr := t_RslChanNr_PCH_AGCH(0)}),
			t_RSL_IE(RSL_IE_PAGING_LOAD, RSL_IE_Body:{paging_load := buffer_space})
		}
	}

	/* 8.5.3 BTS -> BSC */
	template RSL_Message ts_RSL_CHAN_RQD(OCT1 ra, GsmFrameNumber fn, uint8_t acc_del := 0) := {
		msg_disc := ts_RSL_MsgDisc(RSL_MDISC_CCHAN, false),
		msg_type := RSL_MT_CHAN_RQD,
		ies := {
			t_RSL_IE(RSL_IE_CHAN_NR, RSL_IE_Body:{chan_nr := t_RslChanNr_RACH(0)}),
			t_RSL_IE(RSL_IE_REQ_REFERENCE, RSL_IE_Body:{req_ref := ts_RSL_IE_ReqRef(ra, fn)}),
			t_RSL_IE(RSL_IE_ACCESS_DELAY, RSL_IE_Body:{access_delay := acc_del})
		}
	}

	/* 8.5.4 BTS -> BSC */
	template RSL_Message ts_DELETE_IND(RslChannelNr chan_nr, octetstring imm_ass) := {
		msg_disc := ts_RSL_MsgDisc(RSL_MDISC_CCHAN, false),
		msg_type := RSL_MT_DELETE_IND,
		ies := {
			t_RSL_IE(RSL_IE_CHAN_NR, RSL_IE_Body:{chan_nr := chan_nr}),
			t_RSL_IE(RSL_IE_FULL_IMM_ASS_INFO, RSL_IE_Body:{full_imm_ass_info := ts_RSL_LV(imm_ass)})
		}
	}

	/* 8.5.5 BSC -> BTS */
	template RSL_Message tr_RSL_PAGING_CMD(template octetstring identity, template uint3_t tn := ?) := {
		msg_disc := ts_RSL_MsgDisc(RSL_MDISC_CCHAN, false),
		msg_type := RSL_MT_PAGING_CMD,
		ies := {
			tr_RSL_IE(RSL_IE_Body:{chan_nr := t_RslChanNr_PCH_AGCH(tn)}),
			tr_RSL_IE(RSL_IE_Body:{paging_group := ?}),
			tr_RSL_IE(RSL_IE_Body:{ms_identity := tr_RSL_LV(identity)}),
			* /* opt: channel needed, eMLPP prio */
		}
	}

	/* 8.5.6 BSC -> BTS */
	template RSL_Message tr_RSL_IMM_ASSIGN(template uint3_t tn := ?) := {
		msg_disc := ts_RSL_MsgDisc(RSL_MDISC_CCHAN, false),
		msg_type := RSL_MT_IMMEDIATE_ASSIGN_CMD,
		ies := {
			tr_RSL_IE(RSL_IE_Body:{chan_nr := t_RslChanNr_PCH_AGCH(tn)}),
			tr_RSL_IE(RSL_IE_Body:{full_imm_ass_info := ?})
		}
	}


	/* 8.6.4 BTS -> BSC */
	template RSL_Message ts_RSL_ERROR_REPORT(RSL_Cause cause) := {
		msg_disc := ts_RSL_MsgDisc(RSL_MDISC_CCHAN, false),
		msg_type := RSL_MT_ERROR_IND,
		ies := {
			t_RSL_IE(RSL_IE_CAUSE, RSL_IE_Body:{cause := ts_RSL_IE_Cause(cause)})
		}
	}

} with { encode "RAW" ; variant "FIELDORDER(msb)" }