Patent application number | Description | Published |
20100284351 | SPACE-TIME-FREQUENCY DOMAIN BASED INFORMATION FEEDBACK METHOD, USER EQUIPMENT AND BASE STATION THEREOF - A space-time-frequency domain based information feedback method, system, user equipment and base station for wireless transmission technical fields is provided. The user equipment measures and evaluates quality of wireless transmission downlinks in MIMO system, obtains rank, precoding matrix index and channel quality indicator information in the wireless transmission downlinks, processes information of the wireless transmission downlink respectively in space domain, frequency domain and time domain by using space selectivity, frequency selectivity and time selectivity characteristics of a channel, and feeds back downlink information to the base station through uplinks by using feedback schemes. The base station optimizes a transmitter according to feedback information from the user equipment. | 11-11-2010 |
20110007643 | MOBILE COMMUNICATION SYSTEM, BASE STATION, USER EQUIPMENT, AND COMMUNICATION METHOD - A method for adaptively deciding number of feedback resource blocks in a downlink which comprises that a base station ( | 01-13-2011 |
20110013523 | INTERFERENCE-OVERLOAD-INDICATOR GENERATING DEVICE, AND METHOD OF GENERATING INTERFERENCE OVERLOAD INDICATOR - The present invention reduces a signaling size of an interference overload indicator. A base station includes an interference-overload-indicator generation control sub-system ( | 01-20-2011 |
20110013582 | INTERFERENCE-OVERLOAD-INDICATOR GENERATING DEVICE, AND METHOD OF GENERATING INTERFERENCE OVERLOAD INDICATOR - The present invention provides an interference-overload-indicator generating device, a method of generating an interference overload indicator, an interference-overload-indicator generation controller, a method of controlling interference-overload-indicator generation, and a method of indicating interference overload, and a base station utilizing these methods, each of which is used in an uplink FDMA cellular communication system. The base station includes an interference-overload-indicator generation control sub-system ( | 01-20-2011 |
20110019648 | METHOD FOR SWITCHING RADIO RESOURCE CONTROL STATE, BASE STATION, AND USER EQUIPMENT - The present invention provides: a method for switching an RRC state; an eNB; and a UE. The eNB ( | 01-27-2011 |
20110034198 | DETERMINING METHOD FOR USE IN INFORMATION FEEDBACK, BASE STATION, USER EQUIPMENT, AND COMMUNICATIONS SYSTEM - The present invention provides a subband determining method, a base station, user equipment, and a communications system, each of which is used for information feedback. The base station of the present invention finds the subband size on the basis of a system bandwidth and divides the system bandwidth into subbands. The base station further (i) selects some subbands to form a subband set and assign the subband set to user equipment (UE) and (ii) notifies the user equipment (UE) of information about the subband set. The user equipment (UE) in turn finds its corresponding subband size and the number of subbands for use in feedback on the basis of the size of the assigned subband set. The user equipment (UE) further (i) divides the subband set into its corresponding subbands on the basis of a result found and (ii) feeds back information about a predetermined number of subbands to the base station. The base station carries out optimization of its transmitter on the basis of the information, fed back from the user equipment (UE), so as to not only secure a quality of service of a wireless cell, but also improve system efficiency. This method allows feedback to be carried out for downlink information with ease and high efficiency. This in turn reduces load for uplink wireless transmissions and improves feedback precision so as to save wireless resources and improve system efficiency. | 02-10-2011 |
20110134875 | METHOD FOR COOPERATIVE COMMUNICATIONS AMONG BASE STATIONS - A method for cooperative communications among base stations according to the present invention includes: a first step in which a serving base station determines whether a user device is in an mode of cooperative communications among the base stations; a second step in which the serving base station uses a downlink control signal to make configuration for the user device; a third step in which the user device obtains (i) system information regarding the serving base station and a cooperative communication base station indicated by configuration information received and (ii) channel state information; a fourth step in which the user device feeds back channel state information regarding downlink channels between the user device and the serving base station and between the user device and the cooperative communication base station; a fifth step in which the serving base station carries out resource scheduling and backhaul communications in accordance with the channel state information thus fed back; and a sixth step in which the user device receives an allocation instruction to allocate downlink resources. | 06-09-2011 |
20110136495 | BASE STATION, USER DEVICE, COMMUNICATION SYSTEM, METHOD FOR CONTROLLING BASE STATION, METHOD FOR CONTROLLING USER DEVICE, METHOD FOR CONTROLLING COMMUNICATION SYSTEM, PROGRAM, AND STORAGE MEDIUM - A base station ( | 06-09-2011 |
20110164549 | MOBILE COMMUNICATION SYSTEM - This invention provides a mobile communication system, including: a base station device; and a mobile station device, the mobile communication system having a predetermined total bandwidth made of a set of a plurality of downlink component carriers, the base station device and the mobile station device processing each downlink physical layer provided for a respective one of the plurality of downlink component carriers, and the set of the plurality of downlink component carriers including (i) a downlink component carrier employing a subframe structure according to which some symbols at the beginning of a subframe include control information and (ii) a downlink component carrier employing a subframe structure according to which some symbols at the beginning of a subframe do not include control information. | 07-07-2011 |
20110206154 | WIRELESS COMMUNICATIONS SYSTEM AND PRECODING METHOD - The present invention provides a precoding method for use in a wireless communications system. According to the precoding method of the present invention, a serving base station and cooperative communication base stations employ an identical precoding matrix so as to weight transmission signals and then transmit them. The weighting stands for multiplication of results of overall precoding or each layer precoding process by weight values at the serving base station and the cooperative communication base stations. A user device corresponding to the serving base station and the cooperative communication base stations receives a signal which is obtained by an operation in which the serving base station and the cooperative communication base stations perform an identical precoding process and additively combine results of overall precoding or each layer precoding process with one another. The user device feeds back information which includes (i) precoding matrix information for the serving base station and the cooperative communication base stations, (ii) weight vector information for either overall precoding or layer precoding, and (iii) a quantized value of channel quality. This feedback information is thus advantageous in that its signaling information amount is small. | 08-25-2011 |
20110274026 | METHOD FOR ALLOWING TRANSPARENT TRANSMISSION AND NON-TRANSPARENT TRANSMISSION OF RELAY NODE TO COEXIST - The present invention provides a method for allowing transparent transmission and non-transparent transmission of a relay node to coexist. That is, a frequency-division multiplex system is employed so that a transparent transmission mode is used in one operating carrier frequency bandwidth whereas a non-transparent transmission mode is used in another operating carrier frequency bandwidth. In addition, according to the frequency-division multiplex system, the transparent transmission mode is used for a plurality of subframes whereas the non-transparent transmission mode is used for another plurality of subframes. The method for allowing transparent transmission and non-transparent transmission of a relay node to coexist makes it possible to effectively reduce a cost of a system. | 11-10-2011 |
20120004014 | CHANNEL RECONSTRUCTION METHOD, BASE STATION AND USER EQUIPMENT - The present invention discloses a channel reconstruction method for a downlink multi-antenna-multi-base-station with inconsistent antenna configuration. Firstly, a serving base station configures a user equipment. If antenna configuration of the multi-antenna-multi-base-station system is inconsistent, virtual antennas are introduced to a base station with fewer antennas in the system. A user equipment selects and feeds back indices of the virtual antennas and reconstructs channels of the multi-antenna-multi-base-station system to generate a consistent antenna configuration. Finally, the multi-antenna-multi-base-station system transmits a signal to the user equipment by adopting a transmission pre-processing scheme of the consistent antenna configuration. The present invention provides also a serving base station, a cooperative base station and a user equipment for realizing the channel reconstruction method. The present invention has advantages of large application range, simple implementation and better performance. | 01-05-2012 |
20120015662 | RELAY COLLABORATIVE COMMUNICATION SYSTEM AND COMMUNICATION METHOD - The present invention provides a relay collaborative cellular mobile communication system and a communication method of the system. In the method, all relay stations or a base station and relay stations in a cell (i) measure all uplink signals such as uplink reference signals and random-access signals from user devices for obtaining reception qualities of uplink signals of the user devices at the sites and (ii) feed back measurement results to the base station. The base station determines a transmission route of a user device based on the measurement results. A site in a transmission route processes schedule control information and then transmits the information to the user device for performing, based on lumped scheduling of the base station, a downlink reception, an uplink transmission, an uplink retransmission, or a downlink retransmission. In an uplink HARQ mechanism, the site in the transmission route receives an uplink signal from the user device, feeds back an ACK to the user device, and transmits a processed uplink signal to the base station, or feeds back an NACK or an ACK to the base station. The base station judges, based on results of decoding and detecting transmitted data or feedback results from the sites in the transmission route, whether or not the current uplink transmission is successful or whether to adjust the uplink retransmission. | 01-19-2012 |
20120087333 | MOBILE COMMUNICATION SYSTEM AND METHOD, BASE STATION AND USER EQUIPMENT - A mobile communication system where a base station and a user equipment communicates on multiple aggregated carriers is disclosed. In the mobile communication system, the base station notifies to the user equipment information which is relevant to inclusion of an information field indicating scheduling carrier in downlink control information format by using radio resource control signaling, and the user equipment receives, from the base station, downlink control information in the downlink control information format according to the information which is relevant to inclusion of the information field indicating scheduling carrier. | 04-12-2012 |
20130077704 | JOINT CODING METHOD BASED ON BINARY TREE AND CODER - The present invention provides a method and a coder for jointly coding Pre-coding Matrix Index # | 03-28-2013 |
20130089064 | METHOD OF RESOURCE ALLOCATION FOR CHANNEL STATE INFORMATION FEEDBACK AND METHOD OF CHANNEL STATE INFORMATION FEEDBACK - A method of resource allocation for Channel State Information (CSI) feedback is provided, which comprises the following steps of: configuring a downlink transmission approach and a feedback mode for each User Equipment (UE); allocating feedback resources required for CSI feedback by each UE based on the configured downlink transmission approach and feedback mode, such that different types underlying different feedback modes for a single UE will not collide with each other within one sub-frame; and notifying each UE of the corresponding configured downlink transmission approach and feedback mode and allocated feedback resources. Further, a method of Channel State Information (CSI) feedback is provided, which comprises the following steps of: feeding downlink CSI back to a base station (BS) based on a downlink transmission approach and a feedback mode configured by the BS; and solving, when different types underlying different feedback modes collide with each other within one sub-frame, the collision based on a collision solution rule. | 04-11-2013 |
20150049692 | CHANNEL STATE INFORMATION FEEDBACK METHOD AND USER EQUIPMENT - A Channel State Information (CSI) feedback method and a user equipment (UE) are provided. The CSI feedback method comprises: selecting a communication resource by which non-coherent Joint Transmission (JT) is performed, wherein the non-coherent JT achieves a performance target by using the selected communication resource; and feeding back, to a Base Station (BS) participating in the non-coherent JT, an indication of the selected communication resource as enhanced CSI. | 02-19-2015 |
20150092722 | METHOD OF NOTIFYING RESOURCE ALLOCATION FOR DEMODULATION REFERENCE SIGNALS - A user equipment receives, from the base station apparatus, bit information. The bit information indicates first information indicating one or more antenna ports and second information indicating a number of layers for downlink data symbols. | 04-02-2015 |
20150155926 | JOINT CODING METHOD BASED ON BINARY TREE AND CODER - A user equipment generates information based on a plurality of values of joint coding of a Rank Index RI and a first Precoding Matrix Index W1 and transmits the information on a physical uplink control channel. The payload size of the information is 5 bits. The first Precoding Matrix Index W1 and a second Precoding Matrix Index W2 correspond to a precoding matrix and 16 values in the plurality of values correspond to the Rank Index RI of 1 or 2 where a part of values in the plurality of values except the 16 values in the plurality of values correspond to the Rank Index RI of more than 2. | 06-04-2015 |
20150244438 | METHODS FOR CONSTRUCTING PRE-CODING MATRIX AND FEEDING BACK INDEX VALUE AND RELATED COMMUNICATION DEVICES - The disclosure provides a method for constructing a three-dimensional (3D) multi-input multi-output (MIMO) pre-coding matrix, a method for feeding back index values of a 3D MIMO pre-coding matrix and related communication devices. The method for constructing a 3D MIMO pre-coding matrix comprises: constructing a first component matrix in a block diagonal form, wherein a diagonal sub-matrix of the first component matrix is a 3D beamforming sub-precoder for a two-dimensional (2D) antenna array; constructing a second component matrix which comprises phase weighting factors as matrix elements, wherein the phase weighting factors characterize coherent combination of signals from the 2D antenna array; and constructing the 3D MIMO pre-coding matrix according to the constructed first and second component matrixes. The method for feeding back index values of a 3D MIMO pre-coding matrix comprises: estimating a MIMO channel; and according to a result of the channel estimation, selecting and feeding back a first index value, a second index value and a third index value. | 08-27-2015 |
20150341908 | METHOD FOR SENDING AND RECEIVING SYSTEM INFORMATION, BASE STATION, AND USER EQUIPMENT - The present invention provides a method carried out by a base station, including: a step (S | 11-26-2015 |
20160006487 | CHANNEL STATE INFORMATION FEEDBACK METHOD FOR COORDINATED MULTI-POINT SYSTEM AND ASSOCIATED USER EQUIPMENT - The present disclosure provides a method in a UE for feeding back channel state information (CSI) and the UE. The method comprises: acquiring a set of CSI processes which are configured by a transmission point (TP) to participate in multi-antenna multi-TP coordination; acquiring a sub-band (SB) inheritance which is configured by a TP for a CSI process from the set of CSI processes; calculating the CSI based on the configuration for the CSI process; and feeding the calculated CSI back to a TP. The present disclosure has the advantages of simple implementation and low signalling overhead and is applicable to enhanced 4G systems and to 5G systems. | 01-07-2016 |
20160007375 | METHOD AND BASE STATION FOR TRANSMITTING SCHEDULING INFORMATION - The present disclosure provides a method and base station for transmitting scheduling information. The method comprises: determining that a downlink subframe corresponding to the uplink subframe according to a first scheduling timing corresponding to a first Time Division Duplex (TDD) uplink and downlink configuration scheme of a plurality of TDD uplink and downlink configuration schemes is unavailable for transmitting the scheduling information; obtaining a first equivalent TDD uplink and downlink configuration scheme by treating one or more downlink subframes, including the downlink subframe, in a radio frame as uplink subframes; selecting a downlink subframe corresponding to the uplink subframe according to a second scheduling timing corresponding to a second TDD uplink and downlink configuration scheme of the plurality of TDD uplink and downlink configuration schemes, wherein a set of downlink subframes specified in the second TDD uplink and downlink configuration scheme is a subset of a set of downlink subframes specified in the first equivalent TDD uplink and downlink configuration scheme; and transmitting the scheduling information in the selected downlink subframe. | 01-07-2016 |
Patent application number | Description | Published |
20120207119 | METHOD OF NOTIFYING RESOURCE ALLOCATION FOR DEMODULATION REFERENCE SIGNALS - A method of notifying resource allocation for Demodulation Reference Signal (DMRS) is provided. A base station notifies to a user equipment a power offset value between an average EPRE value for data symbols and an average EPRE value for the DMRS at each layer in a semi-static or static manner. Also, the base station dynamically notifies to the user equipment a current channel rank or a current DMRS distribution pattern for the user equipment. The user equipment determines an allocated DMRS antenna port based on a correspondence between the received channel rank and an allocation of DMRS antenna port, thereby obtaining resource allocation information for the DMRS. The signaling overhead for power allocation in the system can be reduced, the efficiency of power amplifier can be improved and the flexibility of system scheduling can be increased. A method of notifying antenna port resource allocation for DMRS is also provided. | 08-16-2012 |
20120224551 | INFORMATION FEEDBACK METHOD AND USER EQUIPMENT - The present invention discloses an information feedback method. The method comprises steps of a serving cell and/or a user equipment determining a cooperating cell set participating multi-antenna-multi-cell cooperation, the cooperating cell set including the serving cell and non-serving cells, the user equipment and/or the serving cell selecting transmit-ports of the serving cell and non-serving cells according to the determined cooperating cell set, the user equipment obtaining channel state information of the selected transmit-ports, and the user equipment feeding back identification information and the channel state information of the selected transmit-ports. The present invention provides also a serving cell, a cooperative cell and a user equipment for feeding back the identification information and channel state information of the selected transmit-ports. The present invention has advantages of simple implementation and less signaling overhead. | 09-06-2012 |
20120281657 | METHOD FOR DOWNLINK MULTI-ANTENNA MULTI-BASE STATION INTERFERENCE COORDINATION AND BASE STATION - A base station in a downlink multi-antenna multi-base station system comprises: a unit for acquiring spatial domain characteristic information for downlink interference; a unit for generating an interference coordination indication based on the spatial domain characteristic information for downlink interference; and a background interface communication unit for transmitting the generated interference coordination indication to a neighboring base station, instructing the neighboring base station to perform resource scheduling, thereby reducing or eliminating interference on the base station. Also disclosed is a method for interference coordination, which is capable of reducing or eliminating interference on a serving base station from its neighboring base stations by utilizing an interference coordination indication transmitted from the serving base station. Only a small amount of inter-base station signaling interaction is required to achieve distributed inter-cell interference coordination. The present invention has the advantages of low signaling overhead, simple implementation, decreased delay, and flexible adaptation. | 11-08-2012 |
20130279363 | METHOD FOR TRIGGERING APERIODIC CHANNEL STATE INFORMATION FEEDBACK - The present disclosure provides a method for triggering aperiodic Channel State Information (CSI) feedback used in a multiple coordinated cells multiple component carriers system. According to the present disclosure, a base station firstly semi-statically configures a user equipment to CoMP transmission modes, and/or information on measurement cells, and/or information on measurement component carriers by a high layer signaling (RRC signaling). Then, the base station dynamically initiates an aperiodic CSI feedback request to the user equipment by downlink control information (through PDCCH). When receiving the aperiodic CSI feedback request transmitted by the base station, the user equipment transmits measured aperiodic CSI to the base station through an uplink channel (PUSCH or PUCCH). According to the present invention, the method for triggering aperiodic CSI feedback in CoMP transmission modes can be flexibly configured, and good backward compatibility can be obtained at the same time. The above method is simple and effective, the system design complexity is low, and the design requirements for practical systems and LTE-Advanced evolved systems are met. | 10-24-2013 |
20130286881 | CHANNEL STATE INFORMATION FEEDBACK METHOD AND USER EQUIPMENT - A Channel State Information (CSI) feedback method and a User Equipment (UE) are disclosed. The method comprises the following steps of: determining a set of coordinated Base Stations (BSs) participating multi-BS coordination, the set of coordination BSs containing a serving BS and at least one non-serving BS; for each BS in the set of coordinated BSs: calculating a Signal to Interference and Noise Ratio (SINR) for a channel between a UE and the BS based on a hypothetical BS coordination mode corresponding to the BS; and deriving a Channel Quality Index (CQI) corresponding to the calculated SINR and feeding back the derived CQI to the serving BS. | 10-31-2013 |
20130286991 | METHOD FOR DOWNLINK CHANNEL STATE INFORMATION FEEDBACK IN MULTI-ANTENNA MULTI-CARRIER MULTI-CELL ENVIRONMENT - A method of resource allocation for Channel State Information (CSI) feedback is provided, which comprises the following steps of: configuring, for a User Equipment (UE), a CSI feedback mode for each of a plurality of coordinated cells; allocating feedback resources required for CSI feedback by the UE for each of the plurality of coordinated cells based on the configured feedback modes, such that the CSI feedbacks for different coordinated cells will not collide with each other within one sub-frame; and notifying the configured feedback modes and the allocated feedback resources to the UE. In addition, a method of Channel State Information (CSI) feedback is provided, which comprises the following steps of: receiving, at a User Equipment (UE), from a Base Station (BS) information on configured feedback modes and allocated feedback resources for CSI feedback for a plurality of coordinated cells; feeding, by the UE, the CSI of the plurality of coordinated cells back to the BS over the allocated feedback resources based on the configured feedback modes; and solving, when feedback types underlying different feedback modes collide with each other within one sub-frame, the collision based on a collision solution rule. | 10-31-2013 |
20140126408 | USER EQUIPMENT - A Channel State Information (CSI) feedback method and a User Equipment (UE) are provided for better support of Joint Transmission (JT) and Beamforming/Coordinated Scheduling (CB/CS). For JT, phase information for an adjacent Base Station (BS) is fed back. For CB/CS, enhanced CSI for an adjacent BS is fed back. The UE according to the present invention includes: a coordinated BS set determining unit configured for determining a set of coordinated BSs participating in multi-BS coordination, the set of coordinated BSs containing a serving BS and at least one non-serving BS; and a CSI feedback unit configured for feeding back CSI for JT or CB/CS for each non-serving BS in the set of coordinated BSs. The present invention has the advantages of simple implementation and low overhead and is applicable in LTE-A and 4G systems. | 05-08-2014 |
20150295677 | CHANNEL STATE INFORMATION FEEDBACK METHOD AND USER EQUIPMENT - A Channel State Information (CSI) feedback method and a User Equipment (UE) are disclosed. The method comprises the following steps of: determining a set of coordinated Base Stations (BSs) participating multi-BS coordination, the set of coordination BSs containing a serving BS and at least one non-serving BS; for each BS in the set of coordinated BSs: calculating a Signal to Interference and Noise Ratio (SINR) for a channel between a UE and the BS based on a hypothetical BS coordination mode corresponding to the BS; and deriving a Channel Quality Index (CQI) corresponding to the calculated SINR and feeding back the derived CQI to the serving BS. | 10-15-2015 |