Systems and methods for 5G telecommunication call event timestamping to assist in debugging the flow of call events, such as during roaming, handover operations, or when user equipment (UE) accesses a different network slice. Specifically, a system for the provision of wireless telecommunication services can include a core network having a first UDR and a first UDM. The first UDM, upon receiving communication from one or more network functions, can communicate a first message to the first UDR. The first message can include a first timestamp indicating to the first UDR a first time that the first message was transmitted.

Techniques are disclosed for providing data restoration for a call server control function (S-CSCF) in a telecommunications network that includes a P-Visited-Network-ID (PVNI). In some embodiments, in the course of a user device registering to a telecommunications network, a home subscriber server (HSS) of the network stores a PVNI for the user device. If a S-CSCF that corresponds to the user device later fails, the network is able to restore the S-CSCF using the information in the HSS, which includes the PVNI.

A system for converging fifth generation (5G) communication systems for supporting higher data rates beyond fourth generation (4G) systems with a technology for Internet of things (IoT) is provided. The communication method and system may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A system is provided for determining system information validity by acquiring and storing a first system information block and other system information, including information on a public land mobile network (PLMN) identity and a value tag, and determining whether the stored system information is valid for the cell. As another example, a terminal and base station are provided for performing beam failure detection and a recovery procedure using first and second configuration information for beam failure recovery (BFR) and if failure is detected, initiating a first random access (RA) procedure and if second configuration information is received while the first RA procedure is ongoing, terminating the first RA procedure and initiating a second RA procedure based on the second configuration information.

A system for converging fifth generation (5G) communication systems for supporting higher data rates beyond fourth generation (4G) systems with a technology for Internet of things (IoT) is provided. The communication method and system may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A system is provided for determining system information validity by acquiring and storing a first system information block and other system information, including information on a public land mobile network (PLMN) identity and a value tag, and determining whether the stored system information is valid for the cell. As another example, a terminal and base station are provided for performing beam failure detection and a recovery procedure using first and second configuration information for beam failure recovery (BFR) and if failure is detected, initiating a first random access (RA) procedure and if second configuration information is received while the first RA procedure is ongoing, terminating the first RA procedure and initiating a second RA procedure based on the second configuration information.

An example of this disclosure provides a method (500) performed by a base station control unit (CU). The method comprises receiving (502) a request from a base station distributed unit (DU) to store information for a first plurality of cells to be served by the base station DU. The method also comprises sending (504) a response to the base station DU, wherein the response indicates that storing information for the first plurality of cells would exceed a maximum number of cells that can be stored by the base station CU.

An example of this disclosure provides a method (500) performed by a base station control unit (CU). The method comprises receiving (502) a request from a base station distributed unit (DU) to store information for a first plurality of cells to be served by the base station DU. The method also comprises sending (504) a response to the base station DU, wherein the response indicates that storing information for the first plurality of cells would exceed a maximum number of cells that can be stored by the base station CU.

A method and apparatus reports packet data control protocol (PDCP) status and PDCP resets in a wireless communication, using control PDUs that may have security protection applied by ciphering of the control PDUs. Reliability of the PDCP status and reset messages may be assured by acknowledgment according to an acknowledged mode or to an unacknowledged mode.

A method and apparatus reports packet data control protocol (PDCP) status and PDCP resets in a wireless communication, using control PDUs that may have security protection applied by ciphering of the control PDUs. Reliability of the PDCP status and reset messages may be assured by acknowledgment according to an acknowledged mode or to an unacknowledged mode.

A wireless communication network serves a wireless User Equipment (UE). The wireless UE exchanges user data over a data session of a Dynamic Network Name (DNN) while exchanging other user data over other data sessions of other DNNs. An Access and Mobility Management Function (AMF) receives a DNN message for the wireless UE and the DNN and responsively transfers a reattach message for the data session of the DNN to the wireless UE. The wireless UE receives the reattach message and responsively terminates the data session of the DNN and transfers a session message for the DNN to the AMF. The AMF receives the session message for the DNN and the wireless UE and responsively establishes a new data session for the DNN. The wireless UE exchanges new user data over the new data session of the DNN while exchanging additional user data over the other data sessions of the other DNNs.

A non-transitory computer readable medium comprising instructions which causes performance of operations comprising: receiving, by a second network coordination device, current state information of a client device, including a transmit counter and a receive counter, from a first network coordination device, wherein the first network coordination device is a primary network coordination device for the client device and the second network coordination device is a standby coordination device for the client device; and responsive to detecting a particular event, the second network coordination device (i) transitioning to be the primary network coordination device for the client device, (ii) incrementing the transmit counter by an offset, and (iii) transmitting a message to the client device including the incremented transmit counter is shown.