library: implement SI3 Rest Octets as per 3GPP TS 44.018
Change-Id: Iaf86f1451a956bf1deef0a9d98fa0513aeb8164b
Signed-off-by: Vadim Yanitskiy <axilirator@gmail.com>
diff --git a/library/GSM_RestOctets.ttcn b/library/GSM_RestOctets.ttcn
new file mode 100644
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+++ b/library/GSM_RestOctets.ttcn
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+/**
+ * GSM Rest Octets definitions as per 3GPP TS 44.018.
+ *
+ * (C) 2020 Vadim Yanitskiy <axilirator@gmail.com>
+ * All rights reserved.
+ *
+ * Released under the terms of GNU General Public License, Version 2 or
+ * (at your option) any later version.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+module GSM_RestOctets {
+
+import from General_Types all;
+import from Osmocom_Types all;
+
+/* 10.5.2.34 SI 3 Rest Octets */
+type record SI3RestOctets {
+ SelectionParamsOpt sel_params,
+ PowerOffsetOpt pwr_offset,
+ BIT1 si_2ter_ind,
+ BIT1 early_cm_ind,
+ SchedIfAndWhere sched_where,
+ GPRSIndicatorOpt gprs_ind,
+ BIT1 umts_early_cm_ind,
+ SI2quaterIndicatorOpt si2_quater_ind,
+ BIT1 iu_mode_ind ('1'B) optional,
+ SI21IndicatorOpt si21_ind optional
+ /* ... spare padding ... */
+} with {
+ variant (si_2ter_ind) "CSN.1 L/H"
+ variant (early_cm_ind) "CSN.1 L/H"
+ variant (umts_early_cm_ind) "CSN.1 L/H"
+
+ /* If Iu mode is not supported in the cell, the Iu Indicator is not sent
+ * within this cell. Iu Indicator is included if and only if GPRS is
+ * not supported, and Iu mode is supported in the cell. */
+ variant (iu_mode_ind) "PRESENCE(gprs_ind.presence = '0'B)"
+ /* SI21 field is only present if 'WHERE' information is not present. */
+ variant (si21_ind) "PRESENCE(sched_where.presence = '0'B)"
+};
+
+/* Selection Parameters */
+type record SelectionParams {
+ boolean cbq,
+ uint6_t cr_offset,
+ uint3_t temp_offset,
+ uint5_t penalty_time
+} with {
+ variant (cbq) "FIELDLENGTH(1)"
+};
+
+/* Optional Selection Parameters: L | H < Selection Parameters > */
+type record SelectionParamsOpt {
+ BIT1 presence, // L/H
+ SelectionParams params optional
+} with {
+ variant (presence) "CSN.1 L/H"
+ variant (params) "PRESENCE(presence = '1'B)"
+};
+
+/* Optional Power Offset: L | H < Power Offset bit(2) > */
+type record PowerOffsetOpt {
+ BIT1 presence, // L/H
+ uint2_t offset optional
+} with {
+ variant (presence) "CSN.1 L/H"
+ variant (offset) "PRESENCE(presence = '1'B)"
+};
+
+/* Scheduling if and where: L | H < WHERE bit(3) > */
+type record SchedIfAndWhere {
+ BIT1 presence, // L/H
+ uint3_t where optional
+} with {
+ variant (presence) "CSN.1 L/H"
+ variant (where) "PRESENCE(presence = '1'B)"
+};
+
+type record GPRSIndicator {
+ uint3_t ra_colour,
+ BIT1 si13_pos
+} with { variant "" };
+
+/* Optional GPRS Indicator: L | H < GPRS Indicator > */
+type record GPRSIndicatorOpt {
+ BIT1 presence, // L/H
+ GPRSIndicator ind optional
+} with {
+ variant (presence) "CSN.1 L/H"
+ variant (ind) "PRESENCE(presence = '1'B)"
+};
+
+/* Optional SI2quater Indicator: L | H < SI2quater Indicator > */
+type record SI2quaterIndicatorOpt {
+ BIT1 presence, // L/H
+ BIT1 ind optional
+} with {
+ variant (presence) "CSN.1 L/H"
+ variant (ind) "PRESENCE(presence = '1'B)"
+};
+
+/* Optional SI21 Indicator: L | H < SI21 Position > */
+type record SI21IndicatorOpt {
+ BIT1 presence, // L/H
+ BIT1 pos optional
+} with {
+ variant (presence) "CSN.1 L/H"
+ variant (pos) "PRESENCE(presence = '1'B)"
+};
+
+external function enc_SI3RestOctets(in SI3RestOctets ro) return octetstring
+ with { extension "prototype(convert) encode(RAW)" };
+external function dec_SI3RestOctets(in octetstring stream) return SI3RestOctets
+ with { extension "prototype(convert) decode(RAW)" };
+
+
+} with { encode "RAW"; variant "FIELDORDER(msb)" }