Abstract: The present invention provides a method and system for performing distributed channel sensing in which channel information is collected by performing channel sensing according to a channel sensing priority which is determined according to a relative position of a cell to which a wireless connection device belongs from among a plurality of cells which logically partition the zone of the wireless network, and thus the overhead of the channel sensing which is generated in a cognitive wireless multi-hop network environment is reduced, and the transmission failure which occurs when the wireless connection device detects frequencies is reduced.

Abstract: Provided is a machine type communication system including a machine type communication device operating with a battery. The machine type communication system may monitor a residual power of the battery supplying power to the machine type communication device, and may output the monitored residual power to a device of a manager that manages the machine type communication device. Also, a point in time when the residual power of the battery is to be monitored may be determined based on the residual power.

Abstract: The present invention provides a method and system for performing distributed channel sensing in which channel information is collected by performing channel sensing according to a channel sensing priority which is determined according to a relative position of a cell to which a wireless connection device belongs from among a plurality of cells which logically partition the zone of the wireless network, and thus the overhead of the channel sensing which is generated in a cognitive wireless multi-hop network environment is reduced, and the transmission failure which occurs when the wireless connection device detects frequencies is reduced.

Abstract: A method and apparatus of an effective and reliable retransmission based on soft combining when using orthogonal frequency division multiplexing (OFDM) modulation technique in a contention based access system. The method includes receiving a data signal from a transmission node, performing soft combining the valid section part of the data signal which have been previously received and the data signal currently received, determining a collision section of the data signal which is currently received, and saving a valid section part except the collision section of the data signal which is currently received in a buffer. In the contention based access system that uses OFDM modulation technique, in case that data signal reception failure occurs due to a transmission collision, the valid part of the received data signal may be detected and effectively applied to the soft combining, and consequently, the reception probability of data signal can be increased.

Abstract: A radio access method for use in a radio access device in cognitive radio ad-hoc networks, the radio access method comprising: comparing additional information about neighboring radio access devices, which exist in the cognitive radio ad-hoc networks, in a second layer of the radio access device with additional information about the neighboring radio access devices in a third layer of the radio access device in the cognitive radio ad-hoc networks; and generating a routing control message when the additional information of the second layer is different from the additional information of the third layer to broadcast the routing control message.

Abstract: Provided is a machine type communication system including a machine type communication device operating with a battery. The machine type communication system may monitor a residual power of the battery supplying power to the machine type communication device, and may output the monitored residual power to a device of a manager that manages the machine type communication device. Also, a point in time when the residual power of the battery is to be monitored may be determined based on the residual power.

Abstract: Provided is a machine type communication system including a machine type communication device operating with a battery. The machine type communication system may monitor a residual power of the battery supplying power to the machine type communication device, and may output the monitored residual power to a device of a manager that manages the machine type communication device. Also, a point in time when the residual power of the battery is to be monitored may be determined based on the residual power.

Abstract: Disclosed is a method of transmitting and receiving a small amount of uplink data. A method of transmitting uplink data includes detecting uplink data to be transmitted, determining whether or not uplink data transmission is necessary only once, transmitting a service request message including information instructing that a data radio bearer not be generated when it is determined that uplink data transmission is necessary only once, starting a radio resource control (RRC) connection setup process, and performing the uplink data transmission once using a signaling radio bearer without generating the data radio bearer with reference to the information instructing that the data radio bearer not be generated, during the RRC connection setup process, when it is determined that \ uplink data transmission is necessary only once.

Abstract: Provided is a handover apparatus and method for a terminal based on a received signal strength (RSS) and a radial velocity. The handover method may measure an RSS from a currently accessed base station and RSSs from candidate base stations for handover, may measure a radial velocity with respect to the currently accessed base station and radial velocities with respect to the candidate base stations for handover, and may perform a handover by determining a base station for handover based on the measured RSSs and the measured radial velocities when the RSS from the currently accessed base station is less than or equal to a reference RSS.

Abstract: Provided is a technology that enables a terminal to quickly perform an idle-to-active state shift and to quickly perform a handover using a carrier aggregation characteristic. The terminal may attempt a Radio Resource Control (RRC) connection establishment using a plurality of carrier components. When the RRC connection establishment using one of the carrier components succeeds, the terminal may transmit an RRC reconfiguration complete message to a base station.

Abstract: A method is provided for managing a tunnel when a mobile node moves from an existing visiting network to a visiting network which supports a mobile IP. A mobile node may detect a movement of the mobile node, configure a care-of address (CoA) and thereafter transmit a location registration (Binding Update) message to a home agent. The mobile node may create a second tunnel in the visiting network and set the second tunnel as a receiving-only tunnel while maintaining a first tunnel which is already used in the existing visiting network. The mobile node may receive a location registration completion (Binding Acknowledgement) message from the home agent, change the second tunnel to the tunnel capable of transmitting/receiving by modifying a routing table, and cancel the first tunnel.

Abstract: A caller authentication system that may enable a called party to be provided with identification information of a caller may be provided. The caller authentication system, including: a communication system to transmit, when a call request signal is received from a calling terminal of a caller, network information and a telephone number of the calling terminal to a certificate authority server, and to request identification of the caller, the network information and the telephone number being included in the call request signal, to transmit, when identification information of the caller is received from the certificate authority server in response to the identification request, the identification information to a called terminal of a called party, and to enable the identification information to be displayed on the called terminal.

Abstract: Provided are a scheduling apparatus and method, an user equipment, and a relay-based mobile communication system. The scheduling apparatus receives information on a channel state of the access zone from the eNB UE separately from the information on the channel state of the relay zone, performs scheduling for the eNB UE in a subsequent relay zone temporally following the relay zone on the basis of the information on the channel state of the relay zone, and performs scheduling for the eNB UE in a subsequent access zone temporally following the access zone on the basis of the information on the channel state of the access zone.

Abstract: Disclosed is a method of transmitting and receiving a small amount of uplink data. A method of transmitting uplink data includes detecting uplink data to be transmitted, determining whether or not uplink data transmission is necessary only once, transmitting a service request message including information instructing that a data radio bearer not be generated when it is determined that uplink data transmission is necessary only once, starting a radio resource control (RRC) connection setup process, and performing the uplink data transmission once using a signaling radio bearer without generating the data radio bearer with reference to the information instructing that the data radio bearer not be generated, during the RRC connection setup process, when it is determined that \ uplink data transmission is necessary only once.

Abstract: Provided are an apparatus and method for controlling random access of a machine type communication (MTC) device in a wireless communication network providing an MTC service, and a wireless communication system providing an MTC service. The method includes inserting, at a base station, information about a random access preamble group for an MTC device and information about a random access time for an MTC device in system information (SI), and transmitting, at the base station, the SI to at least one MTC device.

Abstract: Disclosed is a call processing method for use in a machine-type communication terminal. The call processing method includes transmitting, by a terminal, a radio resource control (RRC) connection request message to a base station, receiving, by the terminal, an RRC connection setup message from the base station, receiving, by the terminal, an uplink (UL) resource allocation grant message from the base station in a state in which a service request message and a buffer status report message are not transmitted to the base station, and transmitting, by the terminal, a message for call processing corresponding to the UL resource allocation grant message. It is possible to rapidly and efficiently perform a call processing procedure and lengthen the life span of the terminal by reducing power consumption of the terminal that uses battery as an energy source.

Abstract: Provided is a handover apparatus and method for a terminal based on a received signal strength (RSS) and a radial velocity. The handover method may measure an RSS from a currently accessed base station and RSSs from candidate base stations for handover, may measure a radial velocity with respect to the currently accessed base station and radial velocities with respect to the candidate base stations for handover, and may perform a handover by determining a base station for handover based on the measured RSSs and the measured radial velocities when the RSS from the currently accessed base station is less than or equal to a reference RSS.

Abstract: Provided is a machine type communication system including a machine type communication device operating with a battery. The machine type communication system may monitor a residual power of the battery supplying power to the machine type communication device, and may output the monitored residual power to a device of a manager that manages the machine type communication device. Also, a point in time when the residual power of the battery is to be monitored may be determined based on the residual power.

Abstract: The present invention relates to a handover method of a mobile terminal between heterogeneous networks. The present invention may provide a handover method ensuring service continuity between heterogeneous networks by transmitting an IP address of a mobile terminal to a mobile IP management server and activating or inactivating a PDP context when the mobile terminal connected to one of a mobile communication network or a wireless LAN is handed over to the other.

Abstract: Provided is a technology that enables a terminal to quickly perform an idle-to-active state shift and to quickly perform a handover using a carrier aggregation characteristic. The terminal may attempt a Radio Resource Control (RRC) connection establishment using a plurality of carrier components. When the RRC connection establishment using one of the carrier components succeeds, the terminal may transmit an RRC reconfiguration complete message to a base station.