demo/ggsn/model/GTPrecords.java

/**
 * GTPrecords.java
 *
 * GTP and GTP-U records/messages
**/

// References to 3GPP TS 29.060 V8.7.0

// IMSI 7.7.2
record  IMSI_gtpc
{
	int		type_gtpc;				// type = 2 (Decimal)
	int[]	imsi_digits;			// 8 octets (15 BCD digits + padding)
}

//TEI Data I - 7.7.13
// Tunnel Endpoint Identifier Data
// Returned by a successful Create PDP Context request,
// shall be used for all subsequent uplink G-PDUs related
// to the PDP context.
record TeidDataI
{
 int		type_gtpc;				// type = 16 (Decimal)
 int[]		teidDataI;				// 4 octets
}

//NSAPI - 7.7.17
// Only used if/when multiple contexts are created for a PDP and APN ??
record NSAPI_GTPC {
 int		type_gtpc;				// type = 20 (Decimal)
 int		nsapi;					// 4 bits [xxxx : NSAPI]
}

//Charging ID - 7.7.26
record ChargingID {
 int		type_gtpc;				// type = 127 (Decimal)
 int[]		chargingID;				// 4 octets
}


// Response cause values

const int REQUEST_ACCEPTED = 128;
const int SYSTEM_FAILURE = 204;


// ===================================================
// Requests and responses


// ---- Create PDP context ----

// a) request
record  CreatePDPcontext
{
//	int[]	imsi_digits;
//	int[]	teidDataI;
// 100114: use a more abstract representation at model level and
// reuse functions in existing TTCN support libraries. For a single
// context imsi/teid/nsapi can be handled entirely at TTCN level...

	String	imsi;
	//int		downlinkDataTeid;
	int		nsapi;
	String	apn;
}

const int IMSI_OCTETS = 8;
const int TEID_OCTETS = 4;

// b) response
record  CreatePDPresponse
{
	int		causevalue;
	//int		uplinkDataTeid;	// Only applicable if SUCCESS
}


// ---- Delete PDU context ----

// a) request
record  DeletePDPcontext
{
	int		nsapi;
}

// b) response
record  DeletePDPresponse
{
	int		causevalue;
}



record  UpdatePDPcontext
{
	int		nsapi;
	//int		downlinkDataTeid;
}


record  UpdatePDPresponse
{
	int		causevalue;
}

// G-PDU
record  GTPUheader
{
	int		teid;	// Date teid of receiving side
}

record  GPDU
{
	int data;	// TODO: representation of payload on model level?
}