Section: B.2 Support of rate control of user data B.2.0 General
Content: The rate of user data sent to and from a UE (e.g. a UE using CIoT EPS Optimizations) can be controlled in two different ways: - Serving PLMN rate control - APN rate control Serving PLMN rate control is further described in 3GPP TS 23.401[ General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access ]  [77]. The APN rate control parameters are a part of the configuration data stored in the GGSN/PGW and is configured on per APN basis. APN rate control allows HPLMN operators on per APN and user to control the amount of user data sent DL and UL. This is done with help of policing user data on a maximum number of user data packets per time unit both DL and UL. APN rate control DL policing is done in the GGSN/PGW or the SCEF and the APN rate control policing UL is done in the UE. The GGSN/PGW or SCEF can also do APN rate control UL policing. For further information on APN rate control UL in the UE, see 3GPP TS 24.301[ Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS); Stage 3 ]  [84]. For further information on APN rate control in the SCEF, see 3GPP TS 29.128[ Mobility Management Entity (MME) and Serving GPRS Support Node (SGSN) interfaces for interworking with packet data networks and applications ]  [110]. NOTE: Existing AMBR mechanisms are not suitable for such a service since, for radio efficiency and UE battery life reasons, an AMBR of e.g. > 100kbit/s is desirable and such an AMBR translates to a potentially large daily data volume.