diff --git a/e2ap/lib/GU-Group-ID.c b/e2ap/lib/GU-Group-ID.c
new file mode 100644
index 0000000..30320a3
--- /dev/null
+++ b/e2ap/lib/GU-Group-ID.c
@@ -0,0 +1,73 @@
+/*
+ * Generated by asn1c-0.9.29 (http://lionet.info/asn1c)
+ * From ASN.1 module "X2AP-IEs"
+ * 	found in "Spec/e2ap-v031ex.asn"
+ * 	`asn1c -fcompound-names -fno-include-deps -findirect-choice -gen-PER`
+ */
+
+#include "GU-Group-ID.h"
+
+#include "ProtocolExtensionContainer.h"
+asn_TYPE_member_t asn_MBR_GU_Group_ID_1[] = {
+	{ ATF_NOFLAGS, 0, offsetof(struct GU_Group_ID, pLMN_Identity),
+		(ASN_TAG_CLASS_CONTEXT | (0 << 2)),
+		-1,	/* IMPLICIT tag at current level */
+		&asn_DEF_PLMN_Identity,
+		0,
+		{ 0, 0, 0 },
+		0, 0, /* No default value */
+		"pLMN-Identity"
+		},
+	{ ATF_NOFLAGS, 0, offsetof(struct GU_Group_ID, mME_Group_ID),
+		(ASN_TAG_CLASS_CONTEXT | (1 << 2)),
+		-1,	/* IMPLICIT tag at current level */
+		&asn_DEF_MME_Group_ID,
+		0,
+		{ 0, 0, 0 },
+		0, 0, /* No default value */
+		"mME-Group-ID"
+		},
+	{ ATF_POINTER, 1, offsetof(struct GU_Group_ID, iE_Extensions),
+		(ASN_TAG_CLASS_CONTEXT | (2 << 2)),
+		-1,	/* IMPLICIT tag at current level */
+		&asn_DEF_ProtocolExtensionContainer_9566P153,
+		0,
+		{ 0, 0, 0 },
+		0, 0, /* No default value */
+		"iE-Extensions"
+		},
+};
+static const int asn_MAP_GU_Group_ID_oms_1[] = { 2 };
+static const ber_tlv_tag_t asn_DEF_GU_Group_ID_tags_1[] = {
+	(ASN_TAG_CLASS_UNIVERSAL | (16 << 2))
+};
+static const asn_TYPE_tag2member_t asn_MAP_GU_Group_ID_tag2el_1[] = {
+    { (ASN_TAG_CLASS_CONTEXT | (0 << 2)), 0, 0, 0 }, /* pLMN-Identity */
+    { (ASN_TAG_CLASS_CONTEXT | (1 << 2)), 1, 0, 0 }, /* mME-Group-ID */
+    { (ASN_TAG_CLASS_CONTEXT | (2 << 2)), 2, 0, 0 } /* iE-Extensions */
+};
+asn_SEQUENCE_specifics_t asn_SPC_GU_Group_ID_specs_1 = {
+	sizeof(struct GU_Group_ID),
+	offsetof(struct GU_Group_ID, _asn_ctx),
+	asn_MAP_GU_Group_ID_tag2el_1,
+	3,	/* Count of tags in the map */
+	asn_MAP_GU_Group_ID_oms_1,	/* Optional members */
+	1, 0,	/* Root/Additions */
+	3,	/* First extension addition */
+};
+asn_TYPE_descriptor_t asn_DEF_GU_Group_ID = {
+	"GU-Group-ID",
+	"GU-Group-ID",
+	&asn_OP_SEQUENCE,
+	asn_DEF_GU_Group_ID_tags_1,
+	sizeof(asn_DEF_GU_Group_ID_tags_1)
+		/sizeof(asn_DEF_GU_Group_ID_tags_1[0]), /* 1 */
+	asn_DEF_GU_Group_ID_tags_1,	/* Same as above */
+	sizeof(asn_DEF_GU_Group_ID_tags_1)
+		/sizeof(asn_DEF_GU_Group_ID_tags_1[0]), /* 1 */
+	{ 0, 0, SEQUENCE_constraint },
+	asn_MBR_GU_Group_ID_1,
+	3,	/* Elements count */
+	&asn_SPC_GU_Group_ID_specs_1	/* Additional specs */
+};
+