Methods for access control with a back-off timer maintained for low priority devices or machine type communication (MTC) devices, and apparatuses using the same

摘要

A mobile communication device configured for Machine Type Communication (MTC) is provided. In the mobile communication device, a wireless module performs wireless transmissions and receptions to and from a service network, and a controller module starts a back-off timer in response to adding a Public Land Mobile Network (PLMN) identity to a forbidden PLMN list or in response to setting a subscriber identity card coupled to the mobile communication device as invalid. Also, the controller module further forbids any access to the service network via the wireless module until the back-off timer expires, and, before the back-off timer expires, stores an amount of a remaining time for the back-off timer to expire in response to a power-off of the mobile communication device or in response to detaching from the service network via the wireless module.

主权项

1. A mobile communication device, configured for Machine Type Communication (MTC) or configured as a low priority device, comprising:
a wireless module performing wireless transmissions and receptions to and from a service network; and a controller module starting a back-off timer in response to adding a Public Land Mobile Network (PLMN) identity to a forbidden PLMN list or in response to setting a subscriber identity card coupled to the mobile communication device as invalid, forbidding any access to the service network via the wireless module until the back-off timer expires, and, before the back-off timer expires, storing an amount of a remaining time for the back-off timer to expire in response to a power-off of the mobile communication device or in response to detaching from the service network via the wireless module, wherein the controller module further determines whether the time elapsed from the power-off of the mobile communication device or from the detachment is greater than or equal to the remaining time, in response to a power-on of the mobile communication device, wherein, the controller module further, in response to the elapsed time being less than the remaining time, starts the back-off timer with a result of the remaining time minus the elapsed time, and wherein the controller module further removes the forbidden PLMN list and sets the subscriber identity card as valid in response to the back-off timer being expired.