Methods, apparatus and systems for backward compatible multi-access protocol data unit session (PDU) registration and deregistration are described. One method of digital communication includes establishing, by a session management function operating in a communication network, a PDU session for a wireless device and transmitting, upon successfully establishing the PDU session, a registration request to a network-side function to register a context of a PDU session of the wireless device with the network-side function, wherein the registration request identifies a set of session management functions that includes the session management function.

A session management function (SMF) sends to a charging function (CHF), a charging policy request message requesting charging policy information for a packet data unit (PDU) session of a wireless device. The SMF receives, by from the CHF, a response message comprising the charging policy information for the PDU session. The charging policy information comprises: a first charging method; and an information element indicating that a first charging rate is applicable for the PDU session. The SMF determines, based on the charging policy information, a charging control rule for the PDU session. The SMF enforces the charging control rule.

A session management function (SMF) sends to a charging function (CHF), a charging policy request message requesting charging policy information for a packet data unit (PDU) session of a wireless device. The SMF receives, by from the CHF, a response message comprising the charging policy information for the PDU session. The charging policy information comprises: a first charging method; and an information element indicating that a first charging rate is applicable for the PDU session. The SMF determines, based on the charging policy information, a charging control rule for the PDU session. The SMF enforces the charging control rule.

The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure 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. Accordingly, the embodiments herein disclose a method for providing a generic framework to manage a custom subscription over a SIP. The method includes sending at least one request with a plurality of parameters to a server SIP node (200) for any type of data over a SIP regardless of an event package is available or not. The custom subscription is managed by one of creating the custom subscription, modifying the custom subscription, deleting the custom subscription, notifying the custom subscription, and terminating the custom subscription using the plurality of parameters. Further, the method includes providing a subscription for a location management service associated with the server SIP node (200) over the SIP regardless of the event package is available or not. The server SIP node (200) allows a client SIP node (100) to manage a location information using the plurality of parameters.

The disclosure relates to a 5.sup.th Generation (5G) or pre-5G communication system for supporting a higher data transfer rate than a 4.sup.th generation (4G) communication system such as Long Term Evolution (LTE). According to various embodiments of the disclosure, a method for operating an Access and Mobility Management Function (AMF) node in a wireless communication system is provided. The method includes receiving an N2 Multimedia Broadcast Service (MBS) Protocol Data Unit (PDU) session setup request message for establishing an MBS session from a Session Management Function (SMF) node, transmitting the N2 MBS PDU session setup request message to a base station, receiving an N2 MBS PDU session setup response message from the base station, and transmitting the N2 MBS PDU session setup response message to the SMF node.

A timer may be used by a device during registration for one or more services of a telecommunication service provider. The function of the timer is to decrease the time that the device (and, hence, the user of the device) waits for successful registration in instances where the device becomes aware that the user clearly wants to use a service (e.g., make a call). The timer may be configured to start in response to the device receiving user input to establish a communication session during registration, and to stop in response to the device receiving a response indicating a successful registration. If the timer expires during registration, an IMS restoration procedure may be performed to attempt registration using a different approach, which, because of the relatively short duration of the timer, expedites the IMS restoration procedure to establish the session more quickly.

A method for providing bi-directional ultra-wide band (UWB) ranging is provided. The method by a first ultra-wide band (UWB) device includes transmitting an initiation message for initiating UWB ranging, receiving at least one device access message from at least one second UWB device within a contention period, transmitting at least one reply message, receiving at least one device reply message corresponding to the at least one reply message from one or more of the at least one second UWB device, and transmitting, to the one or more second UWB device, a final message based on UWB ranging performed using the device access message, the reply message, and the device reply message.

Various communication systems may benefit from handling of various connection states. For example, certain wireless communication systems may benefit from a hybrid release that may enable any access management function to process a user equipment transaction. A method can include determining, by an access management function, whether to remain a serving node for a user equipment. The method can include taking an action with respect to an NG2 association for the user equipment based on the determination.

Various communication systems may benefit from handling of various connection states. For example, certain wireless communication systems may benefit from a hybrid release that may enable any access management function to process a user equipment transaction. A method can include determining, by an access management function, whether to remain a serving node for a user equipment. The method can include taking an action with respect to an NG2 association for the user equipment based on the determination.

A method and apparatus provide for attachment for restricted local operator services for an apparatus, such as a user equipment. An attach procedure for the restricted local operator services for the apparatus can be performed. A proxy call session control function address for the restricted local operator services can be received during the attach procedure. A session initiation protocol register request message can be generated. The session initiation protocol register request message can include an indication for the restricted local operator services and can include an internet protocol multimedia public user identification based on an identification of the apparatus. The session initiation protocol register request message to the proxy call session control function address can be sent, the session initiation protocol register request message can include the indication for the restricted local operator services.