Abstract: An operating method of a receiving device of a communication system may comprise: receiving an identical signal from an identical transmitting device; receiving interference signals from heterogeneous transmitting devices installed at sample installation points in a base station installation target area; and setting an acceptable interference level on the basis of received signal strength indicators (RSSIs) of the interference signals.

Abstract: Disclosed is a method and device for generating terrain data for terrain analysis. The method may include identifying first data including (i) identification information indicating whether there is a structure in a predetermined area and the number of structures and (ii) a topographic altitude of the predetermined area, identifying, if there is a structure in the predetermined area, second data including a highest altitude of the structure and a depth of the structure, and mapping the first data and the second data to terrain data of the predetermined area.

Abstract: Provided is a method of assessing an interference effect, the method including setting, to determine an interference effect exerted by at least one communication device of a first wireless communication network on a fixed communication device previously arranged in a second wireless communication network, a parameter associated with the communication device of the first wireless communication network and the communication device of the second wireless communication network, generating, for each snapshot, an arrangement state of the communication device of the first wireless communication network arranged based on the communication device of the second wireless communication network, and assessing an interference effect of the communication device of the first wireless communication network on the communication device of the second wireless communication network on a time-by-time basis.

Abstract: An apparatus for interference alignment in a cellular communication network includes a preparation message receiver configured to receive interference alignment preparation messages from receivers; a grouper configured to group the receivers with reference to the received interference alignment preparation messages according to an interference alignment algorithm; and an interference aligner configured to perform interference alignment based on a bandwidth secured for the receivers.

Abstract: The present invention relates to a method for performing an interference management based on received interference signal strength, the interference management apparatus comprises a parameter setting unit configured to set up a permissible interference reference IA of an allowable band and a percentage reference Q of an interference region, a communicating unit configured to receive information related to the received interference signal strength which is measured by at least a terminal from at least a terminal or a base station, and a comparing and determining unit configured to determine that interference excess is generated, in case that the received interference signal strength iA of an allowable band exceeds the permissible interference reference IA. According to the present invention, it is available to figure out an interference effect which a victim receiver undergoes within a permitted region accurately.

Abstract: Provided is a method and apparatus for assigning a frequency in an environment where an incumbent system exists. In a frequency environment where the incumbent system exists, a frequency resource management may be smoothly performed using a plurality of frequency sets classified based on a utilization state of each sub-frequency resource. When a frequency sharing system using the same radio access technology (RAT) as a frequency sharing system to be assigned with a frequency resource exists, it is possible to reduce overhead for frequency sharing by priorly assigning a corresponding frequency resource to the frequency sharing system to be assigned with the frequency resource.

Abstract: Provided are a packet transmission scheduling method in a wireless network and a packet transmission method using the same. The packet transmission scheduling method, includes storing location information and a path loss exponent of each node on a multiplexing path; calculating a Signal-to-Interference and Noise Ratio (SINR) between nodes on a predetermined path based on the stored location information; when the calculated SINR exceeds a threshold, forming the paths as a path table; and scheduling packet transmission based on the formed path table.

Abstract: Provided is a method and apparatus for sharing a frequency in an environment where an incumbent system exists. In a frequency environment where the incumbent system exists, a frequency resource management may be smoothly performed using a plurality of frequency sets classified based on a utilization state of each sub-frequency resource. When a frequency sharing system using the same radio access technology (RAT) as a frequency sharing system to be assigned with a frequency resource exists, it is possible to reduce overhead for frequency sharing by priorly assigning a corresponding frequency resource to to the frequency sharing system to be assigned with the frequency resource.

Abstract: An apparatus and method for sharing a frequency are provided. A cognitive wireless communication device having a minimum ROI may be selected from among a plurality of cognitive wireless communication devices, and an idle frequency of a primary system may be allocated to the selected cognitive wireless communication device, thereby increasing an opportunistic utilization efficiency of the idle frequency.

Abstract: Disclosed is an apparatus and method for ray-tracing using a path preprocess. The method for ray-tracing including launching a ray from a transmitting point at angles with regular intervals, setting a first side of an object where the launched ray is projected as a reference patch, and searching predetermined preprocessed path data for a counterpart patch corresponding to a second side of another object, the second side being exposed to the projected ray reflected or diffracted from the set reference patch, and tracing a transmission path of the reflected or diffracted ray.

Abstract: An apparatus for detecting a signal in a common frequency band includes: a signal processor configured to extract a selected band signal from received wireless signals by filtering the received wireless signal based on a frequency selection control signal, convert the extracted signal to a baseband signal, and detect a predetermined signal; a sensing signal determiner configured to determine existence of the signal, output a determination result, and outputs a frequency selection generating signal when the predetermined signal is absent; and a frequency selection controller configured to output the frequency selection control signal by selecting a target band among a plurality of previously decided bands.

Abstract: The present invention relates to a system and method for managing resources, which involve managing a plurality of frequency resources in a communication system including a plurality of systems not having rights to use a first frequency band.

Abstract: A method and apparatus for modeling radio propagation is provided. In the method, when a wall having a thickness is modeled as a line having no thickness, an error in a shade area is minimized by considering the thickness of a wall while maintaining simplicity in a ray-tracing method.

Abstract: A method for 3D preprocessing for ray tracing includes: selecting and storing visible surfaces by designating one of a plurality of structures as a reference structure and remaining structures as relative structures, searching for the relative structures from the reference structure, storing relative structures having a surface visible from the reference structure, and removing relative structures having an invisible surface; conducting selection and storage based on distance measurement by measuring the distance from the reference structure to each of the stored relative structures and removing relative structures positioned beyond a reference spot predetermined with reference to the reference structure; and calculating a ray propagation path by calculating the propagation path of the ray between the reference structure and each of the relative structures stored in said conducting selection and storage based on distance measurement.

Abstract: Disclosed is a binary phase shift key (BPSK) demodulating device using a phase shifter and a method thereof. The BPSK demodulating device includes an I signal generator to generate an in-phase (I) signal from a received BPSK signal, a Q signal generator to generate a quadrature-phase (Q) signal from the received BPSK signal, using a plurality of phase shifters, an oscillator to generate a first signal to separate a baseband signal, and a determining unit to determine a transmission phase angle based on the I signal and the Q signal.

Abstract: Provided is a method and apparatus for assigning a frequency in an environment where an incumbent system exists. In a frequency environment where the incumbent system exists, a frequency resource management may be smoothly performed using a plurality of frequency sets classified based on a utilization state of each sub-frequency resource. When a frequency sharing system using the same radio access technology (RAT) as a frequency sharing system to be assigned with a frequency resource exists, it is possible to reduce overhead for frequency sharing by priorly assigning a corresponding frequency resource to the frequency sharing system to be assigned with the frequency resource.

Abstract: Provided are a method of adjusting a PCS threshold in a wireless network, and a terminal apparatus for the wireless network. The method and the apparatus determines whether to adjust the PCS threshold to use a shared channel for transmitting data in a wireless network based on a congestion status of the shared channel, and adjusts the PCS threshold based on a packet loss measured for a predetermined period of time.

Abstract: Disclosed is a three dimensional ray tracing method in a dynamic radio wave propagation environment. The method of tracing three dimensional ray in a dynamic radio wave propagation environment, by which cross tests are performed on a plurality of radio wave blocking obstacle surfaces according to a ray tube tracing scheme based on an image method in a simulation area, in which the plurality of radio wave blocking obstacle surfaces are modeled, to detect a radio path between a first point and a second point, the method comprising: defining at least a part of the radio wave blocking obstacle surfaces as valid radio wave blocking obstacle surfaces, the radio wave blocking obstacle surfaces being within a visible region from the first point of which location varies dynamically; and tracing a ray between the first point and the second point by taking into consideration only the defined valid radio wave blocking obstacle surfaces to be simulated.

Abstract: An apparatus for detecting a signal in a common frequency band includes: a signal processor configured to extract a selected band signal from received wireless signals by filtering the received wireless signal based on a frequency selection control signal, convert the extracted signal to a baseband signal, and detect a predetermined signal; a sensing signal determiner configured to determine existence of the signal, output a determination result, and outputs a frequency selection generating signal when the predetermined signal is absent; and a frequency selection controller configured to output the frequency selection control signal by selecting a target band among a plurality of previously decided bands.

Abstract: An apparatus and method for sharing a frequency are provided. A cognitive wireless communication device having a minimum ROI may be selected from among a plurality of cognitive wireless communication devices, and an idle frequency of a primary system may be allocated to the selected cognitive wireless communication device, thereby increasing an opportunistic utilization efficiency of the idle frequency.