Abstract: Provided is a method for managing a group key in a key distribution center. The method includes: receiving a key request from a mobile device; generating a private key for the mobile device using information about a withdrawal time included in the key request; generating a public key and a verification key for the mobile device; and transmitting at least one key including the generated key to the mobile device.

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 time required to set up a voice call in an exemplary embodiment, in which Circuit Switched Fallback (CSFB) is used, is reduced to provide a voice call service to a User Equipment (UE) in a Long Term Evolution (LTE) system. If a voice call occurs in a UE while the UE accesses the LTE system, the UE using CSFB switches to a 2G/3G legacy system, recycles system information for a 2G/3G cell that the UE has accessed before, and immediately proceeds with voice call setup without receiving system information unnecessary for a CSFB process.

Abstract: The present invention relates to a method and apparatus for updating a key for encrypting multicast data in a wireless communication system. The method of the present invention is characterized by comprising: an information receiving step of receiving information on a group entry time and a group exit time from users who have newly entered an arbitrary group including at least one subgroup; a grouping step of grouping the users using the information on the group entry time and the group exit time; and a key transmission step of either transmitting, to the newly-entered users, keys related to the group and the subgroups, or updating, for the remaining users of the subgroups, both the key related to the subgroup to which the user exiting the group belongs and the key of the group and then transmitting the updated keys to the users of the subgroups.

Abstract: A method and apparatus for supporting Non-Access Stratum (NAS) communication between a User Equipment (UE) and a Mobility Management Entity (MME) efficiently by addressing the signaling problems occurring between the UE and the MME in a situation where it is necessary for a network node to identify the UE and acquire UE information, if there is any, from another network node to which the UE has been attached, are provided. The method for communication between the UE and network based on the NAS protocol messages and operations is implemented with the involvement a UE, an MME, and an old MME or an old Serving General Packet Radio Service (GPRS) Support Node (SGSN) to which the UE has been attached before so as to facilitate discovering a best node using the UE information acquired from the old MME or old SGSN during the communication between the UE and the network, resulting in a reduction of a communication delay between the UE and network and an improvement of communication efficiency.

Abstract: The present invention relates to a method for controlling system overload in a wireless communication system. The method comprises: a first step in which a mobility management entity (MME) that has received a tracking region update request message from a first terminal transmits a location update request message to a home subscriber server (HSS); a second step in which, if the HSS has determined that a system overload has occurred, the HSS sets MME-backoff time for preventing the transmission of a request message to the HSS, and transmits a location update rejection message including said MME-backoff time to the MME; and a third step in which the MME drives a backoff timer corresponding to said MME-backoff time and rejects a TAU update request message from a terminal received prior to the completion of the driving of the backoff timer.

Abstract: A method and apparatus are provided for web-based real-time communication. The method includes receiving, from a user equipment (UE), a message requesting information about an Internet Protocol Multimedia Subsystem (IMS) network to which the user equipment (UE) is to access; transmitting, to the UE, address information of the IMS network to which the UE is to access, in response to the received message; and transmitting, to a network device of the IMS network, information about the UE to request establishment of a bearer for a web-based real-time data service. A signaling message for the web-based real-time data service is transmitted between the UE and the IMS network through the bearer.

Abstract: The time required to set up a voice call in an exemplary embodiment, in which Circuit Switched Fallback (CSFB) is used, is reduced to provide a voice call service to a User Equipment (UE) in a Long Term Evolution (LTE) system. If a voice call occurs in a UE while the UE accesses the LTE system, the UE using CSFB switches to a 2G/3G legacy system, recycles system information for a 2G/3G cell that the UE has accessed before, and immediately proceeds with voice call setup without receiving system information unnecessary for a CSFB process.

Abstract: An information format and apparatus used by a base station to make a scheduling decision when the base station allocates resources to a terminal in a mobile communication system are provided. Operations of a terminal to report a maximum transmission power accurately to the base station in a scheduling process are also provided. A method for calculating a maximum transmit power in a constant manner regardless of a channel status is also provided.

Abstract: A method for transmitting and receiving a signal in a traffic detection function (TDF) of a mobile communication system, according to one embodiment of the present specification, comprises the steps of: receiving, from a policy server, a policy that includes address information of packet data network (PDN) gateways (PGWs) respectively corresponding to one or more PDNs; receiving a message that includes a data packet from one PDN among the one or more PDNs; and transmitting the received packet to the address of the corresponding PGW on the basis of the policy information. According to one embodiment of the present specification, it is possible to provide a device and a method capable of providing a charging capability of an application level by providing a method and a device for transferring classified traffic in an implicit selective manner.

Abstract: Provided are a method and apparatus for processing packets. A method for processing packets in a base station (ENB) may include: obtaining information on a rule for dealing with a packet according to supplementary information contained in the header of the packet; receiving a packet; extracting supplementary information from the header of the received packet; and processing the received packet on the basis of the obtained rule information and extracted supplementary information. Hence, the base station may adequately perform packet control operations in accordance with the state thereof.

Abstract: The present invention is a method for transmitting a data packet by a user terminal in a mobile communication system. The method enters a power saving mode for transmitting the data packet only if a channel state satisfies a transmission threshold value, compares the index indicating the channel state and the transmission threshold value upon occurrence of a data packet to be transmitted, starts transmission of the data packet if the index indicating the channel state is greater than the transmission threshold value, and proceeds with the transmission of the data packet until the time set by the timer that starts at the same time as the transmission of the data packet expires.

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 relates a method and apparatus for setting a group-based connection. A connection setting method for a network entity according to one embodiment of the present invention includes the steps of: receiving a request including at least one packet filter from a terminal; obtaining a group identifier corresponding to the packet filter by using the packet filter; when a group bearer corresponding to the group identifier does not exist, generating a group bearer corresponding to the group identifier; and performing allocation such that communication corresponding to the request is performed through the generated group bearer. According to one embodiment of the present invention, a service can be efficiently provided to a terminal.

Abstract: Provided are a method and device that identify characteristics of data to be sent by a user equipment and send small-sized data via a control message. The data transmission method for the user equipment may include: generating IP data; determining whether the IP data corresponds to small data that has a size less than or equal to a preset reference size or matches identification information of a preset service; and transmitting the IP data through a connection management (CM) layer to the network by use of a control message.

Abstract: An information format and apparatus used by a base station to make a scheduling decision when the base station allocates resource to a terminal in a mobile communication system are provided. Operations of a terminal to report a maximum transmission power accurately to the base station in a scheduling process are also provided. A method for calculating a maximum transmit power in a constant manner regardless of a channel status is also provided.

Abstract: The present invention relates to a method and apparatus for controlling a specific service in a network congestion state in a wireless communication system. Particularly, the method for controlling a service by a base station in a wireless communication system according to the present invention comprises: a step of receiving a paging message from a mobility management entity (MME) when a certain terminal generates a downlink packet; a step of checking the setup state of the core network domain included in the paging message; and a paging processing step of, if the core network domain is set as a packet-based voice call service, processing the paging message as a priority.

Abstract: The present invention relates to a method and a device for effectively controlling a handover of a user equipment (UE) in a long connected mode. A method for controlling a handover by an eNB, according to one embodiment of the present invention, comprises the steps of: checking whether a UE is in a long connected mode; and transmitting, to the UE, channel measurement configuration information of which a channel measurement report trigger condition is alleviated compared with a normal connected mode.

Abstract: Provided is a method for paging a User Equipment (UE) in an idle state by a Mobility Management Entity (MME) in a wireless communication network in which a Packet Switched (PS) domain and a Circuit Switched (CS) domain coexist. The method includes receiving a CS page message for paging the UE in a CS domain; and upon receiving the CS page message, sending a PS page message for paging the UE in a PS domain, the PS page message including a priority indicator, to an Evolved Node B (ENB) where the UE is located.

Abstract: The present invention relates to a method of selecting a public land mobile network (PLMN) for network sharing, and a method of communicating at a base station according to one embodiment of the present invention may include: receiving from a core network a handover request message including information on whether to support network sharing of user equipment (UE); selecting a PLMN identification (ID) by using information on whether to support network sharing of the UE; and transmitting the selected PLMN ID to the UE. According to one embodiment of the present invention, since a source base station, a target base station or a core network node may select a correct PLMN depending on the situation of UE when carrying out a handover, it is possible to decrease unnecessary signaling and errors in a network sharing situation.