Mai ganowa na Sabis na Cibiyar sadarwa

 

A Network (Layer) Service Access Point Identifier (NSAPI) ne mai ganewa amfani a GPRS (cell data) cibiyoyin sadarwa.

Ana amfani dashi don gano yanayin Packet Data Protocol (PDP) (wani zaman bayanai na musamman) a cikin Mobile Station (MS) da kuma a cikin GPRS Support Node (SGSN). MS ce ta zaba shi sosai (duk da haka, MS ya kamata ta tabbatar da cewa wani bangare na gudanar da zaman ba ya amfani da NSAPI da aka zaɓa a halin yanzu). Lokacin da MS ta nemi mahallin PDP, tana zaɓar NSAPI wanda ta aika zuwa SGSN tare da buƙatar.

U74Ana kuma amfani da NSAPI a matsayin wani ɓangare na Tunnel Identifier tsakanin GPRS Support Nodes (GSNs). Asalin mai amfani (International Mobile Subscriber Identity (IMSI)) da mai gano aikace-aikacen (NSAPI) an haɗa su cikin Tunnel Identifier (GTPv0) (TID) ko Tunnel Endpoint Identifier (GTPv1) (TEID) wanda ke nuna alamar mai biyan kuɗi tsakanin GSNs (SGSN da GGSN). SGSN ya saka NSAPI tare da adireshin SGSN a cikin "Create PDP Context Request. " Ɗaya daga cikin mahallin PDP na iya samun mahallin PDP da yawa (na biyu) da NSAPI. NSAPI ƙimar ƙididdiga ce a cikin shugaban mahallin PDP.

A cikin tsarin UMTS ana gano haɗin bayanai tsakanin GPRS Core Network da tashar wayar hannu ta amfani da NSAPI, wanda ke gano mai ɗaukar damar rediyo. A cikin sakonnin da suka gabata na GPRS (kafin saki"00), an gano haɗin ta hanyar NSAPI da kuma yarjejeniyar Logical Link Control (LLC) SAPI. Koyaya, a cikin UMTS, kuma ta haka ne a cikin GPRS Release"00, ba a amfani da yarjejeniyar LLC ba.