Nq and Nq' Application Protocol (Nq-AP); Stage 3
The present document specifies the procedures and the Nq and Nq' Application Protocol (Nq-AP) messages used on the Nq/Nq' interfaces between the RAN Congestion Awareness Function (RCAF) and the Mobility Management Entity (MME) or the Serving GPRS Support Node (SGSN). The related stage 2 requirements are specified in 3GPP TS 23.401 [2] and 3GPP TS 23.060 [3].