Abstract: A method and system for securing group communication in a Machine-to-Machine (M2M) communication environment including a plurality of Machine Type Communication (MTC) groups, wherein each of the plurality of MTC groups includes a plurality of MTC devices. The method includes generating a unique group key for securing communication with MTC devices associated with an MTC group in an M2M communication environment, securely providing information on the unique group key to the MTC devices associated with the MTC group, and securely communicating at least one broadcast group message with the MTC devices using the unique group key information.

Abstract: The present invention relates to a method for processing information between mobile communication systems in order to prevent the degradation of user-experienced performance when different types of mobile communication networks are used. The method for processing information at user equipment (UE) to improve user-experienced performance of a mobile communication system includes performing a data communication through a first network and receiving, from a policy server, a routing policy including a validity condition which is information about a condition of designating a UE status for handover. The method further includes, in the handover, if a searched second network satisfies the validity condition, performing the data communication through the second network. Accordingly, a network for data transmission can be selected using a routing policy created in consideration of a UE status or a network status, thereby enhancing user-experienced performance.

Abstract: In a user equipment of a wireless communication system, a method for signal transmission and reception may include; sending a request for a Circuit Switched voice network (CS) service to a Gateway Mobile Switching Center (GMSC) to send and receive data to and from a second user equipment; and receiving a call reject response corresponding to the service request from the GMSC, wherein the call reject response is sent by an entity in a core network of the second user equipment. According to an embodiment, it is possible to provide a suitable service to a sender terminal making a CS service request to a receiver terminal having subscribed only to a PS service without increasing network load.

Abstract: A method for supporting local access and voice communication by a User Equipment (UE) in a wireless network, the method comprises transmitting a message for requesting a Circuit Switch (CS)-based voice service to a eNode B, the UE having a local Internet Protocol (IP)-based Packet Data Network (PDN) connection, and receiving, from the eNode B, a message including information indicating that the local IP-based PDN connection is suspended, if a server managing mobility of the UE determines that suspending the local IP-based PDN connection is supported in a local gateway.

Abstract: Provided are a method and apparatus for reporting power headroom in a mobile communication system supporting carrier aggregation. A user equipment (UE) determines the maximum transmit power for each carrier and the maximum UE transmit power, and sends a power headroom report that contains power headroom for each carrier computed based on the maximum transmit power for the carrier and the maximum UE transmit power to a corresponding base station (ENB).

Abstract: The present disclosure relates to a pre-5th-generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-generation (4G) communication system such as a long term evolution (LTE). A method for managing congestion in a first node in a wireless communication system is provided. The method includes receiving status information from each of nodes configuring a network with the first node, receiving information about a service requirement criterion from a second node as one of the nodes, acquiring additional path setup information for the second node based on the status information received from each of the nodes and the information about the service requirement criterion received from the second node, and transmitting the acquired additional path setup information to the second node.

Abstract: A method and apparatus for setting up an UpLink common bearer shared by a plurality of User Equipments (UEs) in a wireless communication network is provided. The apparatus includes a Serving GateWay (S-GW) for receiving a group identifier of a UE from a Mobility Management Entity (MME), sending a create bearer request message including the group identifier to a Packet Data Network (PDN) GateWay (P-GW), receiving a create bearer response message including UL common S5 bearer information (UL common S5 info) for a group corresponding to the group identifier from the P-GW, and sending a create bearer response message including UL common S1 bearer information (UL common S1 info) to the MME, and the P-GW for receiving the create bearer request message from the S-GW, and generating and sending the create bearer response message including the UL common S5 info.

Abstract: An apparatus and method for performing a radio network deployment state test process in a mobile communication system are provided. In the method, a User Equipment (UE) receives a n equivalent Minimization of Drive Test (MDT)_Public Land Mobile Network (PLMN) list from a Mobility Management Entity (MME) or an enhanced Node B (eNB), wherein a PLMN of the MME is an MDT_PLMN of the UE, the MDT_PLMN is a PLMN in which the UE performs an MDT process as a radio network deployment state test process using an MDT scheme, the equiva lent MDT_PLMNs are equivalent PLMNs of the MDT_PLMN, and the equivalent MDT_PLMN Identifiers (IDs) represent PLMN IDs of equivalent PLMNs of the PLMN of the MME.

Abstract: A method and an apparatus for controlling network access of a User Equipment (UE) based on the network's load and time tolerance (delay tolerance) are provided. A network access method for a terminal in a wireless communication system includes sending an access request message containing a time-tolerant indicator at a predefined time, determining, when a reject message is received, a cause value and a hold time contained in the reject message, and re-sending the access request message after the hold time elapses.

Abstract: The present disclosure relates 5G or pre-5G communication systems for supporting higher data transmission rate than those by LTE or other post-4G communication systems. Disclosed are a method and apparatus for determining a window size in a wireless communication system. The method includes determining an uplink data rate of the UE on a wireless link, determining that a maximum data size transmittable through an internet session including the wireless link is the window size for the internet session based on the uplink data rate, and transmitting uplink data through the internet session based on the determined window size.

Abstract: The present disclosure relates to a method and system for transmitting media preference information related to an emergency call in a mobile communication system. The method for transmitting media preference information associated with an emergency call may include: sending, by a user equipment (UE), an emergency call request message containing media preference information of a user associated with an emergency call to the Proxy Call Session Control Function (P-CSCF); sending, by the P-CSCF, application service information containing the media preference information to the Policy and Charging Rule Function (PCRF); and determining, by the PCRF, a policy to be used for controlling the UE on the basis of the media preference information.

Abstract: A method and a device for setting priority of data transmission are provided. A terminal, which is set to transmit low priority data to a network, transmits a connection request to the network in order to transmit normal-priority data, and receives and stores priority information on data transmission from the network.

Abstract: The present invention relates to a method for processing information between mobile communication systems in order to prevent the degradation of user-experienced performance when different types of mobile communication networks are used. The method for processing information at user equipment (UE) to improve user-experienced performance of a mobile communication system includes performing a data communication through a first network and receiving, from a policy server, a routing policy including a validity condition which is information about a condition of designating a UE status for handover. The method further includes, in the handover, if a searched second network satisfies the validity condition, performing the data communication through the second network. Accordingly, a network for data transmission can be selected using a routing policy created in consideration of a UE status or a network status, thereby enhancing user-experienced performance.

Abstract: In a user equipment of a wireless communication system, a method for signal transmission and reception may include: sending a request for a Circuit Switched voice network (CS) service to a Gateway Mobile Switching Center (GMSC) to send and receive data to and from a second user equipment; and receiving a call reject response corresponding to the service request from the GMSC, wherein the call reject response is sent by an entity in a core network of the second user equipment. According to an embodiment, it is possible to provide a suitable service to a sender terminal making a CS service request to a receiver terminal having subscribed only to a PS service without increasing network load.

Abstract: A method and apparatus is provided for communication between a first terminal capable of using both a Circuit Switched (CS) call and an Internet Protocol Multimedia Subsystem (IMS) session, and a second terminal capable of using the IMS session, in a communication system supporting a Combined CS call and IMS session (CSI service). If the second terminal sends a Session Initiation Protocol (SIP) request (INVITE) message to originate a voice service or a multimedia service including the voice service with the first terminal, a CSI Application Server (AS) of an IMS domain managing the first terminal separates a voice service-related component included in the request message from a multimedia service-related component, and generates and sends first and second request messages to the first terminal.

Abstract: The present invention relates to a method for controlling a session keep-alive by a user equipment in a mobile communication system, comprising the steps of: setting request information of a session lifetime for a new application and transmitting the set request information to a network if the new application starts; and acquiring the session lifetime from the network and adjusting a message transmission period of the user equipment to keep-alive the session by using the session lifetime.

Abstract: The present invention is a method for controlling re-direction between heterogeneous mobile communication systems, comprising a step in which a terminal, a connection request of which is rejected from a first communication system (UTRAN), receives, from a second communication system to which the terminal intends to connect, information indicating that the second communication system does not support the terminal; a step of setting information for preventing re-direction to the second communication system; and a step of transmitting, to the first communication system, a request for connection to the first communication system, which includes the information.

Abstract: The present invention relates to a communication method and apparatus using a wireless local area network access point (WLAN AP). The communication method of the WLAN AP according to one embodiment of the present invention may include step of storing identifiers by correlating a first identifier to be used for the WLAN AP to identify user equipment (UE) with a second identifier to be used for an eNodeB (eNB) to identify the UE, step of receiving, from the UE, a first packet including the first identifier and data, step of creating a second packet, when the first packet is received, by combining the second identifier corresponding to the first identifier with the data of the first packet, and step of transmitting the second packet to the eNB.

Abstract: Provided are a method and apparatus for dormant mode operation in a user equipment. During dormant mode, data transmission between the user equipment and network is suspended. For dormant mode operation, the user equipment determines whether to enter dormant mode, and sends, upon determining to enter dormant mode, a dormant mode entry message containing dormant mode time information to the network.

Abstract: A method and system in which upon occurrence of a P-CSCF failure, a network sends an IMS reregistration request message to a UE. An S-CSCF or an AS monitors a P-CSCF to detect occurrence of a failure in the P-CSCF. Upon detecting the occurrence of a P-CSCF failure, the S-CSCF or the AS sends a request message for IMS reregistration to the UEs being served by the failed P-CSCF. In this manner, the UE can continuously receive the service even though a failure occurs in the P-CSCF.