7.7.A Handling ASN.1/PER encoded parameters

29.0603GPPGeneral Packet Radio Service (GPRS)GPRS Tunnelling Protocol (GTP) across the Gn and Gp interfaceRelease 17TS

During the RAU/HO procedures Gn/Gp SGSN GTPv1 entities send some of the RANAP/BSSGP parameters to a GTPv1 peer. Copying of the BSSGP parameters into GTPv1 IEs is straightforward. RANAP, however, uses ASN.1/PER encoding, which is different from GTPv1 specific TLV encoding.

Transparent copying of RANAP parameters across GTPv1 interfaces:

– a GTPv1 entity shall transparently copy the respective information into one or more octets of the GTPv1 IE as specified in clause 7.7.38 and 3GPP TS 29.274 [52] Annex B.2. With this approach, GTPv1 will not be impacted if the contents of such RANAP/S1AP parameter changes over the time.

Non-transparent copying of RANAP parameters across GTPv1 interfaces:

– GTPv1 entity decodes ASN.1/PER parameter and shall encode the value(s) into one or more octets of the GTPv1 IE according to what is specified in the present document.