Patent application number | Description | Published |
20080198788 | Hybrid automatic repeat request system and method thereof in a communication system - A method to transmit a packet of a BS in a communication system using a HARQ scheme is provided. The method includes assigning resource for transmitting a packet to a mobile station, and transmitting a first packet to the mobile station using the assigned resource; transmitting timing information on which a second packet is transmitted to the mobile station when the BS does not receive information indicating that the mobile station decoded the first packet successfully or when the BS receives information indicating that the mobile station failed to decode the first packet; and transmitting the second packet to the mobile station on a timing point corresponding to the timing information. | 08-21-2008 |
20080205364 | METHOD AND SYSTEM FOR CONFIGURING A FRAME IN A COMMUNICATION SYSTEM - A method and system for configuring a frame in a communication system is provided. The method includes determining a number of frames for configuring one multi-frame, wherein the number is at least two, and configuring each of the determined number of frames, wherein the determined number of frames include a first frame and a second frame temporally discriminated from each other, each of the determined number of frames includes a downlink sub-frame and an uplink sub-frame, a downlink sub-frame of the first frame includes a first area for transmitting a reference signal used for an acquisition of synchronization between a base station and a mobile station, a second area including system information and common control information related to the multi-frame, a third area including modulation scheme information and allocation information of data bursts, a fourth area to which a downlink data burst is allocated in a diversity mode and a fifth area to which a downlink data burst is allocated in a band Adaptive Modulation and Coding (AMC) mode, and a downlink sub-frame of the second frame includes a sixth area including modulation scheme information and allocation information of data bursts, a seventh area to which a data burst is allocated in a diversity mode, and an eighth area to which a data burst is allocated in an AMC mode. | 08-28-2008 |
20080219217 | Method and system for transmitting and receiving data in a heterogeneous communication system - A method and system for transmitting/receiving data in a heterogeneous communication system. A terminal accesses a first controller of a first communication system supporting a first communication service to make a communication path to the first communication system. After making the communication path to the terminal, the first controller determines whether it is possible to provide the first communication service to the terminal over the first communication system. If it is not possible, the first controller transmits to an interworking unit a first request indicating that the terminal requires the first communication service over the second communication system. The interworking unit transmits a second request to a second controller of the second communication system in response to the first request, the second request indicating that the second controller provides the first communication service to the terminal. Upon receiving a response to the second request, the interworking unit controls the first controller to provide the first communication service to the terminal over the second communication system according to the response. | 09-11-2008 |
20080220791 | Method and system for transmitting and receiving common control information in a communication system - Disclosed is a method of transmitting common control information by a base station in a communication system including a first communication system and a second communication system different from each other. In the communication system, a frame for carrying the common control information includes an uplink sub-frame and a downlink sub-frame, each of which includes a resource allocation area for the first communication system and a resource allocation area for the second communication system. The method includes: configuring the common control information to be received by a mobile station belonging to the second communication system; and transmitting the common control information through the resource allocation area for the second communication system included in one of the uplink sub-frame and the downlink sub-frame. | 09-11-2008 |
20080225789 | System and method for allocating resources in a communication system - A method and system for allocating resources in a communication system including a first system having a use right for a plurality of frequency bands, and a second system having no use right for the plurality of frequency bands. The method includes acquiring first, second and third sensing informations indicating frequency bands available by a base station, a relay station and a mobile station belonging to the second system, among the plurality of frequency bands; and selecting a frequency band to be allocated for communications, based on the acquired sensing informations. | 09-18-2008 |
20080227388 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING DATA USING MULTI-USER SUPERPOSITION CODING IN A WIRELESS RELAY SYSTEM - A method and apparatus for joint unicast using multi-user superposition coding in a wireless relay system are provided. A BS superposition-encodes first and second data messages directed to first and second MSs, respectively, scheduled at a current scheduling instant. The first and second data messages carry first and second information bit streams for the first and second MSs, respectively. The first MS has a relatively good direct link to the BS, and the second MS has a relatively bad direct link to the BS. The superposition-coded data is transmitted to the first MS and an RS connected between the BS and the first and second MSs. The RS receives the superposition-coded data from the BS, extracts the second information bit stream by decoding the superposition-coded data, and transmits a third data message carrying the second information bit stream to the first and second MSs. | 09-18-2008 |
20080232312 | APPARATUS AND METHOD FOR TRANSMITTING UPLINK FEEDBACK DATA IN A BROADBAND WIRELESS MOBILE COMMUNICATION SYSTEM - An apparatus and a method for transmitting uplink feedback data in a broadband wireless mobile communication are provided. The method comprises dividing tiles used as a feedback channel into a preset number of groups, selecting one group among the preset number of groups using a downlink channel, selecting a number of tiles, the number of tiles being equal to a number of tiles required for feedback data transmission in the selected group, and mapping feedback data to each selected tile. Thereby, feedback information can be transmitted via a tile selected by a terminal based on a channel state without a process of allocating and reallocating an additional feedback channel, thus enhancing efficiency of uplink wireless resources. | 09-25-2008 |
20080232343 | Apparatus and method for estimating uplink frequency offset in wireless communication system - Provided is an apparatus and method for estimating an uplink frequency offset in a wireless communication system. In a receiving apparatus of a wireless communication system using a random access channel composed of two equivalent sequences, the apparatus includes a channel receiver which extracts samples corresponding to the two sequences from an input random access channel signal; a correlator which computes first and second correlation values by correlating preceding and trailing samples among the samples output from the channel receiver with a predetermined sequence; and a frequency offset estimator which estimates a frequency offset by using a ratio of the second correlation value to the first correlation value output from the correlator. | 09-25-2008 |
20080279358 | Apparatus and method for performing call connection in a communication system - A call connection method and apparatus in a communication system are provided, in which a call connection request message is received from each of first and second terminals, it is determined whether the first and second terminals are requesting a call connection to each other, one of the first and second terminals is selected if the first and second terminals are requesting a call connection to each other, the call connection request of the selected terminal is rejected, and a call is connected between the first and second terminals by performing a call connection to the selected terminal according to the call connection request of the non-selected terminal. | 11-13-2008 |
20080291884 | System and method for transmitting/receiving signal in communcation system - A system and method are disclosed for transmitting/receiving a signal in a communication system in which a first communication system and a second communication system coexist, the second communication system being evolved from the first communication system and being capable of using a control signal and a broadcast signal used in the first communication system. The method of transmitting a signal includes the steps of transmitting a first message including common control information and frame control information for the first communication system in a first frame, transmitting a second message including common control information and frame control information for the second communication system in a second frame, and signaling location information of the transmitted second message in the second frame. | 11-27-2008 |
20080317151 | Apparatus and method for forming subchannel in a communication system - A method for forming a subchannel in a communication system where a first communication system and a second communication system coexist. The method includes determining a first tile set by arranging first tiles remaining after forming at least one first subchannel for the first communication system among frequency resources, including a plurality of tiles, available for the first communication system; determining a second tile set by inserting second tiles which are independent of the frequency resources and are available for the second communication system into the determined first tile set at predetermined positions; forming at least one second subchannel for the second communication system by selecting a predetermined number of tiles from the second tile set; and performing communication using at least one of the first subchannel and the second subchannel. | 12-25-2008 |
20080317156 | METHOD AND APAPRATUS FOR REDUCING UPDATING RATE OF CHANNEL STATUS IN A COMMUNICATION SYSTEM - A method and apparatus for reducing a channel updating rate in a communication system are provided, in which a channel matrix H representing a channel status of physical channels is acquired, eigenvectors of the channel matrix H are output by a Singular Value Decomposition (SVD) of the channel matrix H, and when at least one of the eigenvectors has a phase inversion, the phase inversion is removed from the eigenvector. | 12-25-2008 |
20090092100 | METHOD FOR OPERATING FRAME IN MOBILE COMMUNICATION SYSTEM AND SYSTEM THEREOF - An apparatus and method for indicating a zone by a base station in a mobile communication system, in which a frame consists of an uplink sub-frame and a downlink sub-frame, and each of the uplink and downlink sub-frames includes a plurality of zones, are provided. The method includes identifying at least one of a channel condition of a mobile station, a condition on whether or not the mobile station supports inter-heterogeneous-network communication, a load condition of the base station, and a resource condition of a cell, determining if the mobile station can transmit/receive a signal through a number of zones that is less than the total number of zones based on the at least one identified condition and transmitting control information, which indicates a zone capable of being used for signal transmission/reception by the mobile station, to the mobile station, when the mobile station can transmit/receive the signal through the number of zones. | 04-09-2009 |
20090181689 | METHOD FOR SIGNAL TRANSMISSION/RECEPTION BASED ON HARQ SCHEME IN WIRELESS MOBILE COMMUNICATION SYSTEM - A method of signal transmission/reception by a transmitter in a wireless mobile communication system is provided. The method includes determining a signal transmission/reception corresponding relation between a downlink and an uplink of the wireless mobile communication system using a super-frame, the super-frame including at least one frame, said at least one frame including at least one downlink sub-frame and at least one uplink sub-frame, the signal transmission/reception corresponding relation enabling each sub-frame within a link including fewer sub-frames to correspond to at least one sub-frame within a link including more sub-frames when the downlink and the uplink of the wireless mobile communication system include different numbers of sub-frames, wherein the signal transmission/reception corresponding relation is also determined when the downlink and the uplink of the wireless mobile communication system include a same number of sub-frames, and transmitting and receiving signals to and from a receiver through at least one downlink sub-frame and at least one uplink sub-frame according to the determined signal transmission/reception corresponding relation. | 07-16-2009 |
20090196367 | APPARATUS AND METHOD FOR TRANSMITTING/RECEIVING REFERENCE SIGNAL IN A COMMUNICATION SYSTEM - An apparatus and method for transmitting/receiving a reference signal in a communication system are provided, in which a transmitter determines first and second different transmit power values for first and second pilot tones residing in one of the substantially same time resource and the substantially same frequency resource among pilot tones included in a data area in a subframe having time and frequency resources, and transmits the first pilot tone with the first transmit power value and the second pilot tone with the second transmit power value. The first transmit power may be a reference transmit power value and the second transmit power may be a product between a weight and the reference transmit power value. | 08-06-2009 |
20090203380 | SYSTEM AND METHOD FOR HANDOVER OF MOBILE STATION IN A WIRELESS MOBILE COMMUNICATION SYSTEM - A method for handover by a Mobile Station (MS) in a wireless mobile communication system is provided. The MS receives from a serving Base Station (BS) an identifier and an interference level value of a neighboring BS. The MS determines a hysteresis margin value used for determining handover from the serving BS to the neighboring BS taking into account the interference level value of the neighboring BS. The MS sends a handover request to the serving BS when a difference between strength of a signal received from the neighboring BS and strength of a signal received from the serving BS exceeds the determined hysteresis margin value. | 08-13-2009 |
20090204868 | METHOD AND APPARATUS FOR SIGNAL TRANSMISSION/RECEPTION IN A COMMUNICATION SYSTEM USING AN HARQ SCHEME - An apparatus and method for transmitting a signal in a communication system using a Hybrid Automatic Repeat reQuest (HARQ) scheme are provided. The method includes generating a codeword vector by encoding an information vector by using a first parity check matrix of Low Density Parity Check (LDPC) codes, generating a transmission vector by processing the codeword vector, and transmitting the transmission vector. When the first parity check matrix includes a plurality of square matrix columns, each square matrix includes a size of L×L, the first parity check matrix is one of p parity check matrixes stored in the signal transmission apparatus, the p parity check matrixes support different numbers of information vector square matrix columns, and each of the numbers of information vector square matrix columns indicates the number of square matrix columns corresponding to the information vector from among the plurality of square matrix columns. The first parity check matrix is a parity check matrix supporting the number of information vector square matrix columns determined by using the length of the information vector and the value L from the p parity check matrixes, and the value L is determined by using p and the length of the information vector. | 08-13-2009 |
20090225714 | Apparatus and method for composing diversity subchannel in wireless communication system - An apparatus and a method for composing a subchannel in a wireless communication system are provided. The method includes performing a subband-based permutation on resources for composing a subchannel; selecting one or more subbands as resources for a band selection subchannel from the resources passing through the subband-based permutation; composing the band selection subchannel using at least one of the selected subbands; performing a resource allocation unit based permutation on resources not selected for the band selection subchannel; composing a resource allocation unit based diversity subchannel using subband remained in the selected subbands after the band selection subchannel is composed and at least one of the resource allocation units of the resources passing through the resource allocation unit based permutation; and composing a tone-based diversity subchannel by performing a tone-based permutation on resources remained after the resource allocation unit based diversity subchannel is composed. | 09-10-2009 |
20090262691 | Resource allocation apparatus and method for reducing overhead in mobile communication system - A resource allocation for reducing overhead in a mobile communication system is provided. An operating method of a base station for changing a fixed resource allocation to reduce overhead in a mobile communication system includes calculating a total amount of resources allocated to a corresponding subframe in a period of a corresponding fixed allocation resource; when the total amount of the resources allocated to the corresponding subframe is greater than a threshold, temporarily canceling one or more corresponding fixed allocation resources to make the total amount of the resources allocated to the corresponding subframe less than or equal to the threshold; and reallocating the one or more canceled fixed allocation resources according to a corresponding rule. | 10-22-2009 |
20090276676 | APPARATUS AND METHOD FOR CONTROLLING A HYBRID AUTOMATIC REPEAT REQUEST OPERATION IN A WIRELESS MOBILE COMMUNICATION SYSTEM - An apparatus and method for controlling a Hybrid Automatic Repeat reQuest (HARQ) operation in a transmitter of a wireless mobile communication system using each frame constituted by a plurality of subframes are provided. In the method for controlling an HARQ operation, indication information indicating a subframe position where transmission of a data burst starts and the number of subframes required for transmission of the data burst is transmitted to a receiver through an i-th frame. When the number of subframes does not exceed a threshold, it is determined that the data burst at the subframe position indicated by indication information of an (i+1)-th frame is retransmitted to the receiver. When the number of subframes exceeds the threshold, it is determined that the data burst at the subframe position indicated by indication information of an (i+n)-th frame, where n is a positive integer exceeding 1, is retransmitted to the receiver. | 11-05-2009 |
20090291691 | APPARATUS AND METHOD FOR DETERMINING FRACTIONAL FREQUENCY REUSE REGION BY USING BROADCAST REFERENCE SIGNAL IN BROADBAND WIRELESS COMMUNICATION SYSTEM - An apparatus and method for operating a Fractional Frequency Reuse (FFR) scheme in a broadband wireless communication system is provided. The method includes broadcasting a reference value for determining an FFR region, receiving region information determined by using the reference value from at least one Mobile Station (MS), and determining a communication band of at least one MS by using the region information received from the at least one MS. | 11-26-2009 |
20090303969 | Apparatus and method for employing common control channel and broadcast channel in a broadband wireless communication system with frequency overlay - A broadband wireless communication system supporting frequency overlay is provided. Operations of a base station includes checking whether it is time to transmit a common control signal; switching positions of a first Common Control Channel and a second Common Control Channel applied to a previous transmission of the common control signal while mapping a common control signal to the first Common Control Channel and the second Common Control Channel positioned in different Frequency Assignments; and transmitting the common control signal via the first Common Control Channel and the second Common Control Channel that are switched. | 12-10-2009 |
20090323626 | Resource allocation apparatus and method for reducing overhead in mobile communication system - An operating method of a base station for changing a fixed resource allocation to reduce overhead in a mobile communication system includes calculating a total amount of resources allocated to a corresponding subframe in a period of a corresponding fixed allocation resource; when the total amount of the resources allocated to the corresponding subframe is greater than a threshold, temporarily canceling one or more corresponding fixed allocation resources to make the total amount of the resources allocated to the corresponding subframe less than or equal to the threshold; and reallocating the one or more canceled fixed allocation resources according to a corresponding rule. | 12-31-2009 |
20100002643 | APPARATUS AND METHOD FOR INTER-CELL INTERFERENCE CANCELLATION IN MIMO WIRELESS COMMUNICATION SYSTEM - A method for operating a Mobile Station (MS) in a Multiple Input Multiple Output (MIMO) wireless communication system is provided. The method includes measuring channel quality for a serving Base Station (BS), if the channel quality is less than a threshold, measuring interference power from one or more neighbor BSs, determining a Precoding Matrix Index (PMI) and a priority metric for each neighbor BS, and feeding back at least one of the PMI, a PMI type indicator, the priority metric, and the channel quality to the serving BS. | 01-07-2010 |
20100005132 | APPARATUS AND METHOD FOR GENERATING PERMUTATION SEQUENCE IN A BROADBAND WIRELESS COMMUNICATION SYSTEM - An apparatus and method for generation of an M-length permutation sequence in a broadband wireless communication system are provided. Operations of a generator include splitting an L2-length seed value into a first part and a second part, determining coefficients of a generator polynomial using values of the first part and the second part, and calculating the permutation sequence using the generator polynomial. | 01-07-2010 |
20100005133 | APPARATUS AND METHOD FOR GENERATING PERMUTATION SEQUENCE IN A BROADBAND WIRELESS COMMUNICATION SYSTEM - An apparatus and method for generation of an M-length permutation sequence in a broadband wireless communication system are provided. Operations of a generator include splitting an L2-length seed value into a first part and a second part, determining coefficients of a generator polynomial using values of the first part and the second part, and calculating the permutation sequence using the generator polynomial. | 01-07-2010 |
20100005358 | APPARATUS AND METHOD FOR SUPPORTING HYBRID ARQ IN BROADBAND WIRELESS COMMUNICATION SYSTEM - An apparatus and method for supporting Hybrid Automatic Repeat reQuest (HARQ) in a broadband wireless communication system are provided. A method of performing HARQ by a Mobile Station (MS) in a wireless communication system includes receiving a control message including resource allocation information, decoding the control message, if the decoding is successful, determining whether a previous control message is lost, and if the previous control message is lost, transmitting one of a null signal and a specific indicator through a response channel. | 01-07-2010 |
20100091689 | APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING CONTROL INFORMATION IN A BROADBAND WIRELESS COMMUNICATION SYSTEM USING HALF FREQUENCY DIVISION DUPLEX - An apparatus and method for transmitting/receiving control information in a broadband wireless communication system using Half Frequency Division Duplex (H-FDD) are provided. An operation of a Mobile Station (MS) includes, in the case of a frame at which control information is not transmitted, performing uplink communication at a front end of the frame and, in the case of a frame at which the control information is transmitted, performing downlink communication at a front end of the frame. | 04-15-2010 |
20100172314 | APPARATUS AND METHOD FOR ALLOCATING RESOURCES USING COODBOOK IN A BORADBAND WIRELESS COMMUNICATION SYSTEM - A method and an apparatus for allocating a resource in a broadband wireless communication system are provided. In the method, a Modulation and Coding Scheme (MCS) level set and a burst size set to generate a codebook is determined. The codebook is generated using the MCS level set and the burst size set. Resource allocation information is one of generated and read according to the codebook. | 07-08-2010 |
20100211845 | METHOD FOR PERFORMING HYBRID AUTOMATIC REPEAT REQUEST OPERATION IN A WIRELESS MOBILE COMMUNICATION SYSTEM - A method for performing a Hybrid Automatic Repeat reQuest (HARQ) operation in a wireless mobile communication system that uses Frequency Division Duplex (FDD) or Time Division Duplex (TDD) frames each having a plurality of subframes for communication are provided, in which an HARQ timing including a transmission time of a data burst and a transmission time of an HARQ feedback, for DL HARQ is determined according to data burst assignment information transmitted in a #l DownLink (DL) subframe of a #i frame, and an HARQ operation is performed according to the determined HARQ timing. At least one frame index and at least one subframe index that represent the HARQ timing are determined by using l and i. | 08-19-2010 |
20100227638 | METHOD AND APPARATUS FOR POWER CONTROL IN A WIRELESS COMMUNICATION SYSTEM - A method and apparatus for power control in a wireless communication system are provided. A Mobile Station (MS) operation method for power control in a wireless communication system includes assigning an UpLink (UL) control channel to the MS from a Base Station (BS), determining a location to receive a Transmit Power Control (TPC) command based on the UL control channel, and receiving a TPC command in the determined location and increasing or decreasing transmit power, thus advantageously being capable of reducing an overhead for power control command assignment information. | 09-09-2010 |
20100232539 | Method and apparatus for transmitting control information for interference mitigation in multiple antenna system - A multiple antenna system including a mobile station and a base station are operable to perform a method for transmitting control information for interference mitigation. A Mobile Station (MS) can transmit control information for interference mitigation. The MS determines a first Precoding Matrix Index (PMI) and a second PMI for interference from an adjacent Base Station (BS). Based on a correlation level from correlation values between one of the first PMI and second PMI and the remaining PMIs in the codebook, the MS determines a level of a subset of PMIs, and feeds back information indicating the correlation level. | 09-16-2010 |
20100290372 | METHOD FOR MULTIPLE TDD SYSTEMS COEXISTENCE - The method for multiple TDD systems coexistence comprising steps of: a newly deployed system calculating a relative time offset Δt for a corresponding frame; the newly deployed system transmitting uplink and downlink signals based on a time reference information obtained by a summation of the relative time offset Δt and a time reference of an existing system. With the method proposed in present invention, uplink and downlink interference from adjacent frequency bands and from adjacent carriers in the same frequency band can be greatly reduced and a transmission time utility can be guaranteed for a newly deployed system. | 11-18-2010 |
20110032872 | Apparatus and method for overhead reduction of feedback in closed loop MIMO system - A method and apparatus reduce overhead of feedback in a closed loop Multiple Input Multiple Output (MIMO) system. A controller feeds back the long-term Precoder Matrix Index (PMI) to a serving base station under direction of the serving base station when the long term PMI feedback transmission is required, generates a new codebook using the long term PMI, and determines a short term PMI from the new codebook. A feedback transmitter feeds back the short-term PMI to the serving base station. | 02-10-2011 |
20110261677 | Apparatus and method for supporting various system bandwidths in a broadband wireless communication system - An apparatus and method support various system bandwidths in a broadband wireless communication system. A Mobile Station (MS) operation includes determining a system bandwidth through a primary preamble for frame synchronization, which a Base Station (BS) transmits. A Fast Fourier Transform (FFT) size, the number of guard subcarriers, and the number of used subcarriers corresponding to the system bandwidth are determined using a first table. An operation parameter of a modem is set according to the FFT size, the number of guard subcarriers, and the number of used subcarriers. | 10-27-2011 |
20120327823 | APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING CONTROL INFORMATION IN A BROADBAND WIRELESS COMMUNICATION SYSTEM USING HALF FREQUENCY DIVISION DUPLEX - An apparatus and method for transmitting/receiving control information in a broadband wireless communication system using Half Frequency Division Duplex (H-FDD) are provided. An operation of a Mobile Station (MS) includes, in the case of a frame at which control information is not transmitted, performing uplink communication at a front end of the frame and, in the case of a frame at which the control information is transmitted, performing downlink communication at a front end of the frame. | 12-27-2012 |