Patent application number | Description | Published |
20080212477 | APPARATUS AND METHOD FOR TRANSMITTING DATA USING MULTI-ROUND CONTENTION AVOIDANCE - An apparatus and method for transmitting data by using Multi-round Contention Avoidance (MrCA) are provided. The method includes initializing a contention window for each of a plurality of contention rounds and setting a backoff counter corresponding to a size of the contention window for each contention round, starting from a first contention round to a last contention round, decrementing a backoff counter of a corresponding contention round in a time slot unit and transmitting data when the decremented backoff counter is zero and when the corresponding contention round is a last contention round. Accordingly, the number of contending nodes is exponentially decreased for each contention round, resulting in significant decrease in a collision probability in addition to improving fairness on channel use among users. | 09-04-2008 |
20080227395 | METHOD FOR REDUCING AN AMOUNT OF FEEDBACK USED IN A MOBILE COMMUNICATION SYSTEM - A method for feeding back a Channel Quality Indicator (CQI) in a mobile communication system is provided. The method includes determining a number of subchannels for which the MS feeds back CQIs based on a preset feedback efficiency factor, selecting the determined number of subchannels in a descending order of channel quality, and feeding back the CQIs of the selected subchannels to a Base Station (BS). | 09-18-2008 |
20080233989 | APPARATUS AND METHOD FOR TRANSMITTING/RECEIVING CHANNEL QUALITY INFORMATION IN A COMMUNICATION SYSTEM - An apparatus and method for transmitting/receiving a Channel Quality Information (CQI) in a communication system are provided. A Mobile Station (MS) receives first information indicating a representative MS selected from a group of MSs located within a preset range and in similar channel statuses, the group including the MS, determines from the first information whether the MS is designated as the representative MS, and transmits a CQI of the MS as a representative CQI of the MSs included in the group to a Base Station (BS), if the MS is designated as the representative MS. | 09-25-2008 |
20080240009 | SYSTEM AND METHOD FOR DATA TRANSMISSION/RECEPTION IN A COMMUNICATION SYSTEM - Disclosed is a system and method for transmitting data based on an operational state of a mobile station in a communication system. The method includes, when detecting a low battery state of the mobile station, storing one or more data packets to be transmitted to the mobile station, extracting at least one data packet, which has a transmission delay time larger than a difference between a maximum delay time and preset margin, from the one or more stored data packets, and transmitting at least a part of the extracted at least one data packet to the mobile station by using a resource allocated to the mobile station. | 10-02-2008 |
20080317033 | Apparatus and method for requesting bandwidth allocation and allocating bandwidth in a communication system - A method and apparatus for requesting bandwidth allocation and allocating a bandwidth in response to the request in a communication system are provided, in which an mobile station detects a second CID requiring bandwidth allocation, the second CID being different from a first CID included in a MAC header, generates a grant management subheader including an order field and a bandwidth field, the order field being for writing a rank of the second CID in a CID list listing CIDs of the mobile station according to a predetermined criterion and the bandwidth field being for writing a bandwidth required for the second CID, concatenates the grant management subheader to the MAC header, and transmits the concatenated MAC header and grant management subheader to a base station to request bandwidth allocation for the second CID. | 12-25-2008 |
20080318520 | Apparatus and method for transmission and reception in multiple input multiple output system with replay station - A multiple antenna system for using a relay station with multiple antennas is provided. The system includes a base station for determining encoded data processing procedure based on first and second channel state information, determining a relaying procedure of the relay station, and sending the relaying procedure to the relay station based on the first and second channel state information; wherein the encoded data is terminating to a mobile station; the relay station for receiving data and the relay procedure which the base station sent, converting and sending the data according to the relaying procedure, and sending the first channel state information to the base station as a measured state of channel which receives the data; and the mobile station for receiving the data which the relay station sent, and sending the second channel state information to the relay station as a measured state of channel which receives the data. | 12-25-2008 |
20090016460 | Apparatus and method for beamforming with limited feedforward channel in multiple input multiple output wireless communication system - An apparatus and method are provided for beamforming in a MIMO wireless communication system. A base station includes a first calculator that repeatedly calculates downlink beamforming vectors of the user terminals to calculate the optimal beamforming vectors for the user terminals, a quantizer that quantizes the downlink beamforming vectors in order to transmit information of the downlink beamforming vectors, a control channel transmitter that feeds forward information of the quantized downlink beamforming vectors to the user terminals, a second calculator that calculates the final downlink beamforming vectors of the user terminals, and a beamforming transmitter that sums the beamformed TX signals of the user terminals and transmits the summed TX signals through a plurality of TX antennas. | 01-15-2009 |
20090017858 | Method and system for peer-to-peer communication in a communication system - A method and system for establishing a P2P communication connection between mobile stations in a cellular communication system are provided, in which a first mobile station transmits a first request message requesting setup of a P2P communication connection to a base station, receives a neighbor table including information about mobile stations capable of P2P communications with the first mobile station from the base station, selects a second mobile station with which to establish the P2P communication connection using the neighbor table, and establishes the P2P communication connection with the second mobile station. | 01-15-2009 |
20090036050 | Apparatus and method for controlling power in wireless communication system using relaying - An apparatus and method for controlling a mode transition of a mobile station (MS) in a relay station (RS) in a wireless communication system are provided, in which upon receipt of a mode transition request signal from at least one MS within a service area of the RS, the RS determines whether to approve the mode transition request, sets management information for the mode transition of the MS, if the mode transition request of the MS is approved, and transmits the management information to the MS. | 02-05-2009 |
20090036133 | Apparatus and method for transmitting/receiving message for handover to heterogeneous system in broadband wireless access - Provided is an apparatus and method for transmitting/receiving a message for a handover to a heterogeneous system in a BWA system. In the method, a neighboring BS information message containing the neighboring heterogeneous system BS information is generated according to the neighboring BS information message generation scheme of the serving system. The serving system BS has only to transmit information about a neighboring BS of the serving system, thus reducing a message overhead. Also, the neighboring heterogeneous system BS has only to transmit its own BS information within the corresponding coverage, thus enabling efficient use of control channel resources. | 02-05-2009 |
20090059820 | SYSTEM AND METHOD FOR USING FREQUENCY AND TIME RESOURCES IN A COMMUNICATION SYSTEM - A method and system for using frequency resources in a communication system are provided. In the method and system, a total frequency band is divided into at least two frequency subbands and there is a guard interval between frequency subbands. A first frequency subband includes a TDD UL frequency subband and a TDD DL frequency subband. A second frequency subband includes an FDD UL frequency subband. A BS sets a frequency band between the TDD UL frequency subband and an FDD UL frequency subband as an additional UL frequency subband, and receives a signal from an MS in the additional UL frequency subband. | 03-05-2009 |
20090059858 | System and Method for requesting bandwidth allocation and allocating bandwidth in communication system - Disclosed is a method of requesting bandwidth allocation by an MS having at least two CIDs in a communication system, the method including the steps of detecting at least one CID needing the bandwidth allocation; when a plurality of CIDs are detected, generating a grant management subheader including a region for recording the total number of the CIDs needing bandwidth allocation and a region for recording bandwidth information of a generic MAC header CID, and a grant management subheader including, for each of the CIDs needing bandwidth allocation, other than the generic MAC header CID, a region for recording the order of a corresponding CID given in a MS CID list and a region for recording bandwidth information of the corresponding CID; and transmitting the generic MAC header with the grant management subheaders concatenated thereto to a BS. | 03-05-2009 |
20090069024 | Method for Requesting Bandwidth Allocation and Detecting Service Flow in Communication System - A method for requesting bandwidth allocation by a mobile station in a communication system is provided. The mobile station detects at least one Connection IDentifier (CID), bandwidth allocation for which is to be requested, generates a bandwidth request header when the number of the at least one detected CID equals one, and transmits the bandwidth request header to a base station, wherein the bandwidth request header includes a region for indicating a first CID representing basic information for identification of the mobile station, a region for indicating a ranking of the detected CID, and a region for indicating information about bandwidth requested for the detected CID. | 03-12-2009 |
20090073911 | FEEDBACK METHOD FOR MULTICAST SERVICE IN WIRELESS COMMUNICATION SYSTEM, AND A SYSTEM IMPLEMENTING THE METHOD - A method for providing multicast service by a base station in a wireless communication system and a system implementing the method are provided. The method includes receiving one or more multicast service request messages including downlink channel state information from one or more mobile stations, determining the number of mobile stations which have requested a multicast service, determining a modulation and coding scheme (MCS) based on a mobile station, which has transmitted lowest channel quality information, among the one or more mobile stations when the determined number of mobile stations exceeds a preset value, and providing the multicast service through a t | 03-19-2009 |
20090125776 | Method for providing multicast service in a wireless communication system and system thereof - A method is provided for providing a multicast service by a base station (BS) in a wireless communication system. The method includes transmitting an N | 05-14-2009 |
20090135805 | System and method for connection identifier synchronization in a communication system - A method is provided for synchronizing Connection IDentifiers (CIDs) of a first station and a second station in a communication system. The CID synchronization method includes sending, by the first station, a first message for requesting addition of a service flow identified by a CID to the second station; sending, by the second station, a second message which is a response message to the first message, and at the same time, setting a number of a frame where the second message is transmitted as a first start frame number; sending, by the first station, a third message for acknowledging receipt of the second message to the second station, and at the same time, setting a number of a frame where the third message is transmitted as a second start frame number; performing, by each of the first station and the second station, a modulo operation on a frame having the first or second start frame number and its succeeding frames using a positive integer for each frame, and detecting a number of a frame where a result value of the modulo operation becomes zero (0); and simultaneously updating CID lists of the first station and the second station at a frame having the detected frame number with regard to a CID of the added service flow. | 05-28-2009 |
20090196257 | APPARATUS AND METHOD FOR PERFORMING HANDOVER OF TERMINAL IN WIRELESS COMMUNICATION SYSTEM - Provided are an apparatus and a method for performing a handover of a terminal in a wireless communication system. In the method, a ranging code is transmitted to a target base station on which a handover is to be performed. A ranging response message comprising Connection Identification (CID) update information is received from the target base station together with resource assignment information for transmission of a ranging request message. Therefore, fast resumption of downlink data reception of the terminal can be supported through fast CID update during a handover. | 08-06-2009 |
20090196273 | Apparatus and method for transmitting data in wireless communication system - An apparatus and a method for a random access scheme for multi-channel in a wireless communication system are provided. The method for performing the random access scheme for the multi-channel in the wireless communication system includes randomly generating a backoff counter value to transmit data; adjusting the backoff counter value by taking into account status of a plurality of idle subcarrier sets per backoff slot; when the backoff counter value becomes zero, selecting one or more subcarrier sets to carry the data from the idle subcarrier sets; and transmitting the data through the selected one or more subcarrier sets. The data collision probability between the terminals can be lowered, the channel utility can be enhanced, the transfer rate in the single-channel random access scheme can be raised, and the consumption of the radio resource can be reduced without using signals for the band request and allocation. | 08-06-2009 |
20090207809 | APPARATUS AND METHOD FOR REDUCING HANDOVER DELAY IN BROADBAND WIRELESS COMMUNICATION SYSTEM - A method and an apparatus for reducing a handover delay in a broadband wireless communication system are provided. In a method for operating a terminal to reduce a handover delay in a broadband wireless communication system, a handover procedure is performed with a serving Base Station (BS) to obtain a dedicated ranging code and a Connection ID (CID). The dedicated ranging code is transmitted to one or more target BSs using the CID. Whether the dedicated ranging code is received is determined. Therefore, a handover delay and a chance of malfunction can be reduced. | 08-20-2009 |
20090241002 | Method and apparatus for selecting retransmission mode in a mimo communication system - A method and apparatus for selecting a retransmission mode in a MIMO communication system are provided wherein a receiver receives m initial transmission streams from a transmitter, m being an integer of 2 or larger, channel-decodes the m initial transmission streams and checking errors in the m channel-decoded streams, selects, if at least two channel-decoded streams have errors among the m channel-decoded streams, a retransmission mode to be used for the at least two streams having errors in the transmitter, and transmits information including the selected retransmission mode to the transmitter. | 09-24-2009 |
20090252073 | APPARATUS AND METHOD FOR OPERATING HIERARCHICAL CELL IN BROADBAND WIRELESS COMMUNICATION SYSTEM - An apparatus and method for operating a hierarchical cell in a wireless communication system are provided. A femto BS transitions into a sleep mode if there is no accessed MS for a predefined time. The femto BS transmits a FEMTO-ADV message in the sleep mode to notify of the presence of the femto BS. The femto BS releases the sleep mode upon receiving a MOB-FEMTO-AWAKE-REQ message from an MS receiving the FEMTO-ADV message. Thereafter, the femto BS communicates with the MS. | 10-08-2009 |
20090253380 | Apparatus and method for beamforming in a multiantenna multiuser communication system - A method for beamforming by a transmission device in a multiantenna multiuser communication system. The method includes grouping codebook indexes included in a codebook into codebook index combinations, and calculating a sum of transmission rate for each of the codebook index combinations; selecting a codebook index combination with a maximum sum of transmission rate as an optimal codebook index combination; and transmitting a codebook index corresponding to a particular reception device among codebook indexes included in the optimal codebook index combination, to the particular reception device. | 10-08-2009 |
20090258650 | Apparatus and method for reduction of handover interruption time using estimated handover time negotiation in a broadband wireless communication system - An apparatus and method for reduction of a handover interruption time using an estimated handover time negotiation in a broadband wireless communication system are provided. A method for supporting a handover of a mobile station in a serving base station includes receiving a handover pre-notification response message including a residual estimated handover time from a target base station, determining a current residual estimated handover time using the residual estimated handover time, and exchanging the determined residual estimated handover time with the target base station. | 10-15-2009 |
20090275326 | METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING SYSTEM INFORMATION IN BROADBAND WIRELESS COMMUNICATION SYSTEM - A method and an apparatus for transmitting and receiving System Information (SI) of a femto base station in a wireless communication system are provided. In the method, an SI transmission point is determined using unique identification information of a femto base station itself and unique identification information of a macro base station with which the femto base station is associated. Each of user equipment and the macro base station generate a measurement gap pattern representing an SI reception point using the unique identification information of the femto base station and the unique identification information of the macro base station. SI is received from the femto base station according to the generated measurement gap pattern. | 11-05-2009 |
20090285143 | Apparatus and method for saving power of femto base station in wireless communication system - An apparatus and a method for transiting an operation mode of a femto base station in a wireless communication system are provided. The method includes, in a sleep mode, confirming whether operation transition request information is received from at least one terminal; and when receiving the operation transition request information from the terminal, entering an active mode. Thus, the power consumption of the femto base station can be reduced and the interference caused by the operation of the femto base station can be mitigated. | 11-19-2009 |
20090316595 | METHOD AND APPARATUS FOR IDENTIFYING BASE STATION IN WIRELESS COMMUNICATION SYSTEM - A method and an apparatus for identifying a base station in a wireless communication system are provided. The method includes storing a Neighbor Cell List (NCL) received from a serving base station, obtaining a Physical Cell IDentifier (PCID) from a signal received from a neighbor base station, and identifying whether the neighbor base station is a macro base station or a femto base station by determining whether the obtained PCID exists in the stored NCL. | 12-24-2009 |
20100041393 | PAGING METHOD AND APPARATUS THEREOF IN BROADBAND WIRELESS COMMUNICATION SYSTEM - Provided are a paging method and an apparatus thereof for User Equipment (UE) in a broadband wireless communication system. In the method, a paging message is received from a macro base station. Whether there exists an accessible femto base station inside a service area of the macro base station is determined. When there does not exist the accessible femto base station inside the service area of the macro base station, the UE responds to the paging message of the macro base station. When there exists the accessible femto base station inside the service area of the macro base station, the UE waits for a paging message to be received from the femto base station. | 02-18-2010 |
20100069069 | Apparatus and method for automatically searching for low-power base station supporting access of registered user in mobile communication system - An apparatus and method for automatically searching for a low-power Base Station (BS) supporting access of a registered user in a mobile communication system includes a method of performing automatic search on a Closed Subscriber Group (CSG) cell by a User Equipment (UE). The method includes determining by the UE whether automatic search needs to be performed on the CSG cell. The method also includes, if it is determined that automatic search does not need to be performed on the CSG cell, turning off by the UE a CSG cell automatic search function of the UE by emptying a first white list including CSG Identifiers of accessible CSG cells. | 03-18-2010 |
20110103282 | METHOD AND DEVICE FOR CONTROLLING HAND-OVER MESSAGE TRANSMISSION POWER IN A MOBILE COMMUNICATIONS SYSTEM - The present invention relates to a method and a device for controlling the hand-over message transmission power of a mobile station in a mobile communication system. The present invention comprises the processes of: acquiring uplink data relating to a hand-over target base station; using the uplink data to determine the maximum transmission power of a hand-over ranging message; and transmitting a hand-over ranging message having a power level below the determined maximum transmission power to the hand-over target base station. | 05-05-2011 |
20130210433 | METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING SYSTEM INFORMATION IN BROADBAND WIRELESS COMMUNICATION SYSTEM - A method and an apparatus for transmitting and receiving System Information (SI) of a femto base station in a wireless communication system are provided. In the method, an SI transmission point is determined using unique identification information of a femto base station itself and unique identification information of a macro base station with which the femto base station is associated. Each of user equipment and the macro base station generate a measurement gap pattern representing an SI reception point using the unique identification information of the femto base station and the unique identification information of the macro base station. SI is received from the femto base station according to the generated measurement gap pattern. | 08-15-2013 |