The present disclosure relates to methods and apparatus for flexible, security context management during AMF changes. One aspect of the disclosure is a mechanism for achieving backward security during AMF changes. Instead of passing the current NAS key to the target AMF, the source AMF derives a new NAS key, provides the new NAS key to the target AMF, and sends a key change indication to the UE, either directly or through some other network node. The UE can then derive the new NAS key from the old NAS key. In some embodiments, the AMF may provide a key generation parameter to the UE to use in deriving the new NAS key. In other embodiments, the target AMF may change one or more security algorithms.

The present disclosure relates to methods and apparatus for flexible, security context management during AMF changes. One aspect of the disclosure is a mechanism for achieving backward security during AMF changes. Instead of passing the current NAS key to the target AMF, the source AMF derives a new NAS key, provides the new NAS key to the target AMF, and sends a key change indication to the UE, either directly or through some other network node. The UE can then derive the new NAS key from the old NAS key. In some embodiments, the AMF may provide a key generation parameter to the UE to use in deriving the new NAS key. In other embodiments, the target AMF may change one or more security algorithms.

A method for transmitting data, includes: in response to detecting uplink data to be transmitted to a base station, saving the uplink data in a designated buffer; in response to starting Radio Access Network Location Area Update (RLAU), reading the uplink data in the designated buffer; and transmitting the uplink data to the base station through request signaling corresponding to the RLAU, such that the base station acquires the uplink data in the request signaling.

A method and apparatus provide for the control of wireless communication signals over an enhanced dedicated channel (E-DCH) resource while operating in the CELL_FACH state with an allocated E-DCH radio network temporary identifier (E-RNTI). A determination is made that a periodic cell update timer is expired. In response to the periodic cell update timer expiring, a determination is made whether the WTRU has an allocated E-DCH resource. If the WTRU has an allocated E-DCH resource, the periodic cell update timer is re-started without performing a periodic cell update.

Provided is a communication method configured to allow a function of CIoT to be used even in a 5GS that supports a network-initiated configuration update procedure and a plurality of types of session and service continuities. Further provided is a communication method which configured to appropriately manage, by a user equipment, connection established between the user equipment and a network even in a case that a network-initiated change of a state of the user equipment has been performed. Thereby, the communication method for performing the function of CIoT in the 5GS and the communication method for performing a network-initiated procedure of changing the state of the user equipment are provided.

Provided is a communication method configured to allow a function of CIoT to be used even in a 5GS that supports a network-initiated configuration update procedure and a plurality of types of session and service continuities. Further provided is a communication method which configured to appropriately manage, by a user equipment, connection established between the user equipment and a network even in a case that a network-initiated change of a state of the user equipment has been performed. Thereby, the communication method for performing the function of CIoT in the 5GS and the communication method for performing a network-initiated procedure of changing the state of the user equipment are provided.

A method and device for decreasing the frequency of tracking area update (TAU) procedures triggered by cell reselections in LTE idle mode without sacrificing paging reception success rate consisting of identifying a frequency of a camped cell in LTE idle mode of a first SIM; assigning the current frequency a highest priority irrespective of the system information blocks (SIBs) broadcast by the network; and remaining on the current frequency until: a cell selection reception level value of the camped cell is less than a first predetermined threshold value or a cell selection quality value of the camped cell is less than a second predetermined threshold value.

A Machine Type Communication (MTC) device including a wireless transceiver and a controller is provided. The wireless transceiver performs wireless transmission and reception to and from a service network. The controller receives a paging message including a timer update flag from the service network via the wireless transceiver, transmits a Service Request message to the service network via the wireless transceiver in response to the paging message including the timer update flag, and receives a downlink (DL) Information Transfer message including a value for a periodic update timer from the service network via the wireless transceiver.

In a network arrangement for carrying out a location of locating objects that are arranged in a confined space and are able to be moved, the location being carried out by pulsed radio signals, wherein at least three communication-technically autarkic reference nodes that are spatially distributed and form a communication network are arranged in the confined space a communication protocol enables a location object that is arranged in the confined space to be localized by a trilateration carried out by a distance-based trilateration that is carried out by the at least three reference nodes.

In a network arrangement for carrying out a location of locating objects that are arranged in a confined space and are able to be moved, the location being carried out by pulsed radio signals, wherein at least three communication-technically autarkic reference nodes that are spatially distributed and form a communication network are arranged in the confined space a communication protocol enables a location object that is arranged in the confined space to be localized by a trilateration carried out by a distance-based trilateration that is carried out by the at least three reference nodes.