Abstract: A method by a first base station comprises receiving a message including information related to a sum of traffic loads of user equipment and information related to a location of a second base station from second base stations, identifying a sum of traffic loads transmitted from the second base stations, to the UEs, identifying whether the identified sum of the traffic loads is larger than a sum of data rates for the corresponding UEs of the corresponding second base stations located in the specific first area, when the identified sum of the traffic loads is larger than the sum of the data rates, identifying a specific UE to be operated as a second base station among the corresponding UEs located in the specific first area, and transmitting information indicating that the specific UE is to operate as the second base station to the specific UE.

Abstract: A method by a first base station comprises receiving a message including information related to a sum of traffic loads of user equipment and information related to a location of a second base station from second base stations, identifying a sum of traffic loads transmitted from the second base stations, to the UEs, identifying whether the identified sum of the traffic loads is larger than a sum of data rates for the corresponding UEs of the corresponding second base stations located in the specific first area, when the identified sum of the traffic loads is larger than the sum of the data rates, identifying a specific UE to be operated as a second base station among the corresponding UEs located in the specific first area, and transmitting information indicating that the specific UE is to operate as the second base station to the specific UE.

Abstract: An inter-vehicle communication method and an apparatus for performing the same. The inter-vehicle communication method may include a reception node receiving at least one vehicle-to-vehicle (V2V) message from at least one transmission node and the reception node transmitting a relay V2V message on the basis of the at least one V2V message, wherein the at least one V2V message may include information about adjacent vehicles discovered by the at least one transmission node.

Abstract: The present invention relates to a method for efficiently transmitting error-tolerant traffic in low power and lossy networks (LLNs). The method for transmitting an error-tolerant traffic includes when a packet is received, modifying a medium access control (MAC) layer of a receiving device to perform received signal strength indication (RSSI) sampling at a symbol rate and estimating a symbol error rate of the packet in the MAC layer based on the sampled RSSI value, and when the estimated symbol error rate is lower than a specific value, transmitting the received packet to a higher layer.

Abstract: The present invention relates to a method for efficiently transmitting error-tolerant traffic in low power and lossy networks (LLNs). The method for transmitting an error-tolerant traffic includes when a packet is received, modifying a medium access control (MAC) layer of a receiving device to perform received signal strength indication (RSSI) sampling at a symbol rate and estimating a symbol error rate of the packet in the MAC layer based on the sampled RSSI value, and when the estimated symbol error rate is lower than a specific value, transmitting the received packet to a higher layer.

Abstract: An inter-vehicle communication method and an apparatus for performing the same. The inter-vehicle communication method may include a reception node receiving at least one vehicle-to-vehicle (V2V) message from at least one transmission node and the reception node transmitting a relay V2V message on the basis of the at least one V2V message, wherein the at least one V2V message may include information about adjacent vehicles discovered by the at least one transmission node.

Abstract: Disclosed are a method for transferring data in a wireless communication system that supports device-to-device communication, and an apparatus therefor. Specifically, a method for performing, by a device, data transfer in a wireless communication system that supports device-to-device communication, comprises the steps of: broadcasting, at a first sub-carrier, a ready-to-forward (RTF) signal for advertising that the device holds data to transfer; receiving, at a second sub-carrier, a forward-request (FR) signal for requesting transfer of the data from another device; and broadcasting the data after a predetermined time, wherein the first sub-carrier and the second sub-carrier are determined on the basis of sequence numbers of the data, respectively.

Abstract: The present disclosure relates to a method for message flooding in a wireless communication system, and is characterized in that it includes the steps of: broadcasting, by a transmission node, a flooding message to a surrounding node through a first common channel; checking, by a reception node, whether the first common channel has received the flooding message; transmitting, by the reception node, an ACK signal through a second common channel or a NACK signal through a third common channel, based on a result of the check; and determining, by the transmission node, whether the second common channel or the third common channel has detected a signal, to determine whether to re-transmit the flooding message.

Abstract: Provided are a device and method for configuring a multi-hop network. The device includes a controller configured to set a second multi-hop network including some terminals of a first multi-hop network, the first multi-hop network being built using a low-power communication interface, and the second multi-hop network being built using a communication interface having a longer transmission distance than in the first multi-hop network.

Abstract: A system for downlink transmission using heterogeneous power includes a plurality of sensor nodes, a coordinator connected to a network including the plurality of sensor nodes and configured to transmit data to the plurality of sensor nodes, a power source configured to supply power required for the coordinator to transmit data to each of the plurality of sensor nodes through a single transmission passage at a position away by a specific distance from the network, to the coordinator, and a battery configured to supply power required for the plurality of sensor nodes to perform communication within the network, to the plurality of sensor nodes, wherein when a destination node as a reception target of the data, among the plurality of sensor nodes, receives the data, the destination node transmits a signal indicating the data reception to the other remaining nodes among the plurality of sensor nodes.

Abstract: Disclosed are a method for transferring data in a wireless communication system that supports device-to-device communication, and an apparatus therefor. Specifically, a method for performing, by a device, data transfer in a wireless communication system that supports device-to-device communication, comprises the steps of: broadcasting, at a first sub-carrier, a ready-to-forward (RTF) signal for advertising that the device holds data to transfer; receiving, at a second sub-carrier, a forward-request (FR) signal for requesting transfer of the data from another device; and broadcasting the data after a predetermined time, wherein the first sub-carrier and the second sub-carrier are determined on the basis of sequence numbers of the data, respectively.

Abstract: The present disclosure relates to a method for message flooding in a wireless communication system, and is characterized in that it includes the steps of: broadcasting, by a transmission node, a flooding message to a surrounding node through a first common channel; checking, by a reception node, whether the first common channel has received the flooding message; transmitting, by the reception node, an ACK signal through a second common channel or a NACK signal through a third common channel, based on a result of the check; and determining, by the transmission node, whether the second common channel or the third common channel has detected a signal, to determine whether to re-transmit the flooding message.

Abstract: A system for downlink transmission using heterogeneous power includes a plurality of sensor nodes, a coordinator connected to a network including the plurality of sensor nodes and configured to transmit data to the plurality of sensor nodes, a power source configured to supply power required for the coordinator to transmit data to each of the plurality of sensor nodes through a single transmission passage at a position away by a specific distance from the network, to the coordinator, and a battery configured to supply power required for the plurality of sensor nodes to perform communication within the network, to the plurality of sensor nodes, wherein when a destination node as a reception target of the data, among the plurality of sensor nodes, receives the data, the destination node transmits a signal indicating the data reception to the other remaining nodes among the plurality of sensor nodes.

Abstract: A method and apparatus for distribution control of traffic when providing a real-time application program service using Multipath Transport Control Protocol (MPTCP) in a heterogeneous wireless network environment are provided. The method of operating a transmitter in a heterogeneous wireless network includes determining a transmission rate of each of the subflows corresponding to each of the networks, and then transmitting traffic through those subflows. The transmission rate for each subflow is determined in consideration of (i) the transmission rate per unit time from the upper layer to the transport control protocol (TCP) layer and (ii) the bottleneck link capacity.

Abstract: A scheduling method for a wireless communication system is disclosed. The method includes (a) selecting n(<N) terminals among the N terminals included in the wireless communication system; (b) receiving channel state information from the selected terminals and allocating wireless resources to at least one terminal among the selected terminals; (c) performing transmission or reception via the allocated wireless resource at the at least one terminal; and (d) newly selecting n terminals and returning to the (b) step, wherein the remaining terminals except for the selected terminals inactivate the transmitting and receiving function at the steps of (b) and (c). Therefore, a wireless cellular network adapted to improve the energy efficiency in fairness is provided.

Abstract: A scheduling method for a wireless communication system is disclosed. The method includes (a) selecting n(<N) terminals among the N terminals included in the wireless communication system; (b) receiving channel state information from the selected terminals and allocating wireless resources to at least one terminal among the selected terminals; (c) performing transmission or reception via the allocated wireless resource at the at least one terminal; and (d) newly selecting n terminals and returning to the (b) step, wherein the remaining terminals except for the selected terminals inactivate the transmitting and receiving function at the steps of (b) and (c). Therefore, a wireless cellular network adapted to improve the energy efficiency in fairness is provided.

Abstract: An adaptive control apparatus for keeping a dropping probability of a handoff call requested without user mobility information below a predefined level, to guarantee a quality of service (QoS). The apparatus adaptively controls an admission threshold of each cell in a wireless network to maintain the handoff dropping probability below a predefined level. The admission threshold is dynamically adjusted based on handoff drop events. The apparatus can guarantee QoS and maximize channel utilization. Since the apparatus is simply based on the handoff drop events of each cell rather than mobility of the respective calls, it is possible to remarkably decrease the complexity as compared with the existing mobile-oriented apparatus. In addition, the apparatus can solve the inter-cell unfairness problem.