Section: 4.7.7 Support of rate control of user data using CIoT EPS Optimisation 4.7.7.1 General
Content: The rate of user data sent to and from a UE (e.g. a UE using CIoT EPS Optimisations) can be controlled in two different ways: - Serving PLMN Rate Control - APN Rate Control Serving PLMN Rate Control is intended to allow the Serving PLMN to protect its MME and the Signalling Radio Bearers in the E-UTRAN from the load generated by NAS Data PDUs. APN Rate Control is intended to allow HPLMN operators to offer customer services such as "maximum of Y messages per day". 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. The PDN GW in the visited PLMN may send the APN rate control parameter for an emergency PDN connection.