Abstract: The present invention is to provide a method and device for controlling transmission power by taking comprehensive consideration not only of the effect received onto itself in each device-to-device (D2D) link of a D2D communication network but also of the effect exerted onto the neighboring links.

Abstract: A link scheduling method in a system for performing Device-to-Device (D2D) communication includes periodically collecting information indicating whether to perform a medium access from at least one neighboring link determining at least one link expected to perform a medium access in a corresponding traffic slot among links with a higher priority than the terminal based on the collected information, and determining whether to perform the medium access of the terminal by considering only the at least one link expected to perform the medium access.

Abstract: A PCEF for setting a PCC rule in a mobile communication network includes: a receiver for receiving a command message including a monitoring key list including at least one monitoring key corresponding to a PCC rule and a number of instances monitored in a corresponding service, from a Policy and Charging Rules Function (PCRF); a setting unit for setting the PCC rule based on the command message and setting a monitoring key according to the at least one monitoring key; and a monitoring processor for setting a range of monitoring in consideration of the number of instances and the at least one monitoring key, and performing monitoring based on the set range of the monitoring.

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 providing a device-to-device (D2D) communication-based service for an isolated user equipment (IUE) by a relay user equipment (RUE) in a mobile communication system is provided. The method includes establishing a D2D link with an IUE; and supporting establishment of a relay cellular link for the IUE based on the established D2D link, wherein the RUE is within a service coverage of an enhanced node B (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). The present invention relates to a method for selecting, by a device, a peer discovery resource (PDR) in a device-to-device (D2D) communication system, the method comprising the steps of: determining a PDR selection range which can be selected by the device; and selecting a PDR in the determined PDR selection range.

Abstract: The present invention is to provide a method and device for controlling transmission power by taking comprehensive consideration not only of the effect received onto itself in each device-to-device (D2D) link of a D2D communication network but also of the effect exerted onto the neighboring links.

Abstract: In a method for deciding an unregistered macrocell user equipment (MUE) adjacent to a femtocell base station (home evolved node B; HeNB), a macrocell base station (macro evolved node B; MeNB) decides occurrence of an unregistered MUE influenced by interference from a HeNB among MUEs. The MeNB requests an adjacent HeNB to transmit system information (SI) of the adjacent HeNB of which interference has influence on the unregistered MUE, and the unregistered MUE searches for the SI of the adjacent HeNB and transmits the searched SI to the MeNB, when it is decided that the unregistered MUE has occurred. The MeNB informs the adjacent HeNB of existence of the unregistered MUE using a closed subscriber group identifier (CSG ID) of the SI of the adjacent HeNB, transmitted from the unregistered MUE.

Abstract: A link scheduling method in a system for performing Device-to-Device (D2D) communication includes periodically collecting information indicating whether to perform a medium access from at least one neighboring link determining at least one link expected to perform a medium access in a corresponding traffic slot among links with a higher priority than the terminal based on the collected information, and determining whether to perform the medium access of the terminal by considering only the at least one link expected to perform the medium access.

Abstract: A PCEF for setting a PCC rule in a mobile communication network includes: a receiver for receiving a command message including a monitoring key list including at least one monitoring key corresponding to a PCC rule and a number of instances monitored in a corresponding service, from a Policy and Charging Rules Function (PCRF); a setting unit for setting the PCC rule based on the command message and setting a monitoring key according to the at least one monitoring key; and a monitoring processor for setting a range of monitoring in consideration of the number of instances and the at least one monitoring key, and performing monitoring based on the set range of the monitoring.

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: Disclosed is a method for distributing contention among terminals in a Contention Access Period (CAP) of a superframe in regard to a Medium (or Media) Access Control (MAC) layer employing a beacon-enabled mode in IEEE 802.15.4 standard. The method includes: dividing the CAP or the superframe into a plurality of sub-periods, all having the same size; receiving an association request message from a relevant terminal; and allocating one of the plurality of sub-periods to the relevant terminal, and transferring information on the sub-periods to the relevant terminal through a beacon frame, by a Personal Area Network (PAN) coordinator.

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: 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: In a method for deciding an unregistered macrocell user equipment (MUE) adjacent to a femtocell base station (home evolved node B; HeNB), a macrocell base station (macro evolved node B; MeNB) decides occurrence of an unregistered MUE influenced by interference from a HeNB among MUEs. The MeNB requests an adjacent HeNB to transmit system information (SI) of the adjacent HeNB of which interference has influence on the unregistered MUE, and the unregistered MUE searches for the SI of the adjacent HeNB and transmits the searched SI to the MeNB, when it is decided that the unregistered MUE has occurred. The MeNB informs the adjacent HeNB of existence of the unregistered MUE using a closed subscriber group identifier (CSG ID) of the SI of the adjacent HeNB, transmitted from the unregistered MUE.

Abstract: Disclosed is a method of recognizing an available channel in order to prevent channel occupation requirements from colliding with each other when one wireless channel is shared by plural terminals in a CSMA/CA mechanism using an IEEE 802.15.4 protocol slot, the method including: a first step of initializing a counter, CW, as 2, the CW being used for CCA which an attempt to perform is made before frame transmission; a second step of determining if a required channel is occupied; a third step of decreasing the CW by 1 when the channel is idle in the second step; a fourth step of re-determining if the channel is occupied; and a fifth step of, based on a determination result in the fourth step, determining if the CW is 1 when the channel is occupied.

Abstract: Disclosed is a system and a method for polling in an Ethernet Passive Optical Network (EPON). The system includes: multiple Optical Network Units (ONUs) for sharing optical channels of the EPON with one another and transmitting traffic; and an Optical Line Terminal (OLT) for discriminating a plurality of ONUs gaining access to the EPON among the multiple ONUs and then collecting routing information on the plurality of ONUs gaining access to the EPON, and for classifying the plurality of ONUs gaining access to the EPON into two or more ONU groups according to the collected routing information and then carrying out forming a polling cycle and allocating bandwidth on each ONU group. Therefore, a transmission idle period in a traffic channel is not only minimized, but an availability ratio of traffic channels can also be maximized.

Abstract: Disclosed is a system and a method for polling in an Ether net Passive Optical Network (EPON). The system includes: multiple Optical Network Units (ONUs) for sharing optical channels of the EPON with one another and transmitting traffic; and an Optical Line Terminal (OLT) for discriminating a plurality of ONUs gaining access to the EPON among the multiple ONUs and then collecting routing information on the plurality of ONUs gaining access to the EPON, and for classifying the plurality of ONUs gaining access to the EPON into two or more ONU groups according to the collected routing information and then carrying out forming a polling cycle and allocating bandwidth on each ONU group. Therefore, a transmission idle period in a traffic channel is not only minimized, but an availability ratio of traffic channels can also be maximized.

Abstract: Disclosed is a method fox allocating upstream transmission bandwidth so as to prevent Inter-Scheduling Cycle Gaps (ISCGs) from occurring in an N number of Optical Network Units (ONUs) by using an m number of wavelength channels for upstream transmission in a Wavelength-Division Multiplexing (WDM)-Ethernet Passive Optical Network (EPON). The method includes: grouping the ONUs to be allocated each of the m number of wavelength channels; and performing a Dynamic Bandwidth Allocation (DBA) algorithm in order for the grouped ONUs to efficiently use allocated wavelengths and time slots, thereby allocating each wavelength channel. Accordingly, by using a scheme of managing ONUs by each group, it is possible to more efficiently allocate bandwidth than the online scheduling scheme. As compared with the offline scheduling scheme, ISCGs caused by bandwidth allocation do not occur.

Abstract: Disclosed is a method for distributing contention among terminals in a Contention Access Period (CAP) of a superframe in regard to a Medium (or Media) Access Control (MAC) layer employing a beacon-enabled mode in IEEE 802.15.4 standard. The method includes: dividing the CAP or the superframe into a plurality of sub-periods, all having the same size; receiving an association request message from a relevant terminal; and allocating one of the plurality of sub-periods to the relevant terminal, and transferring information on the sub-periods to the relevant terminal through a beacon frame, by a Personal Area Network (PAN) coordinator.

Abstract: Disclosed is a method of recognizing an available channel in order to prevent channel occupation requirements from colliding with each other when one wireless channel is shared by plural terminals in a CSMA/CA mechanism using an IEEE 802.15.4 protocol slot, the method including: a first step of initializing a counter, CW, as 2, the CW being used for CCA which an attempt to perform is made before frame transmission; a second step of determining if a required channel is occupied; a third step of decreasing the CW by 1 when the channel is idle in the second step; a fourth step of re-determining if the channel is occupied; and a fifth step of, based on a determination result in the fourth step, determining if the CW is 1 when the channel is occupied.