9 General Protocol Error Handling

08.183GPPBase Station System (BSS) - Serving GPRS Support Node (SGSN)BSS GPRS ProtocolGeneral Packet Radio Service (GPRS)Release 1999TS

Refer to General Protocol Error Handling/3GPP TS 08.16 [16]. In addition:

– any type of BSSGP PDU received without an expected conditional IE is discarded and a STATUS PDU (cause "Missing conditional IE") is sent;

– any type of BSSGP PDU received without a mandatory IE is discarded and a STATUS PDU (cause "Missing mandatory IE") is sent;

– any type of BSSGP PDU received with a syntactical error in an expected conditional IE is discarded and a STATUS PDU (cause "Conditional IE error") is sent;

– any type of BSSGP PDU received with a syntactical error in a mandatory IE is discarded and a STATUS PDU (cause "Invalid mandatory information") is sent;

– any type of BSSGP PDU received for a feature that is not negotiated is discarded and a STATUS PDU ( cause "PDU not compatible with the feature set") is sent.

Some BSSGP PDU shall contain one and only one conditional IE amongst a defined list of possible conditional IE (e.g. PAGING-PS PDU). If such a BSSGP PDU is received with more than one conditional IE amongst the defined list of possible conditional IE, as defined in section 10, the PDU is discarded and a STATUS PDU (cause "Unexpected conditional IE") is sent.