Abstract: The present disclosure provides a method for locating an idle-state user equipment and an apparatus. An access network device updates a cell location identifier in a system message to a preset location identifier, and notifies, by using a paging message, idle-state UE in a cell that the system message is changed, so as to trigger the idle-state UE in the cell to read the system message and learn that the cell location identifier is updated. Therefore, the idle-state UE is triggered to initiate a location update process. The access network device locates the idle-state UE in the cell according to the location update process initiated by the idle-state UE in the cell, thereby locating the idle-state UE.

Abstract: The present invention provides a data transmission method, device, and system, and relates to the communications field, which can improve data transmission efficiency. The method includes: determining, by a second base station, that statuses of all HARQ processes in a first hybrid automatic repeat request HARQ buffer are occupied states; and sending, by the second base station, a second data block to a user equipment UE by using an HARQ process in an idle state in a second HARQ buffer, where the first HARQ buffer and the second HARQ buffer are different HARQ buffers disposed in the second base station. The data transmission method, device, and system are applicable to data transmission in carrier aggregation.

Abstract: A system and method for scheduling cooperative uplink transmissions in a virtual multiple input multiple output (MIMO) wireless communication environment are provided. More specifically, both random and channel aware orthogonal scheduling techniques for identifying a sub-set of N mobile terminals to provide cooperative uplink transmissions for each transmit time interval are provided.

Abstract: Embodiments of the present invention provide a measurement method for channel state information, user equipment and a base station. The measurement method includes: selecting one or more coordinated transmission points for coordinated multipoint transmission by the base station for user equipment; and independently configuring a measurement subset used for channel state information feedback for each base station and each coordinated transmission point, so that the user equipment performs measurement according to the measurement subset. With the embodiments of the present invention, channel state information feedback configuration is performed to each cell or transmission point participated in coordination, and a unified structural design for feedback information may be used, so that channel feedback information for multiple transmission points or multiple cells can serve for not only transmission of a single cell, but also transmission of multiple cells.

Abstract: Embodiments of this disclosure provide a multicarrier modulation apparatus and method, a multicarrier demodulation apparatus and method and a system. In the embodiments of this disclosure, a new semi-orthogonal multicarrier waveform is designed for data modulation, odd-numbered subcarriers and even-numbered subcarriers of the waveform being respectively orthogonal to each other, but odd-numbered and even-numbered carriers being not orthogonal to each other, and sinusoid parts of the subcarriers being periodically reversed for a predefined number of times. In comparison with legacy orthogonal frequency division multiplexing (OFDM) multicarrier, the subcarrier spacing of such multicarrier is halved. Hence, the spectral efficiency is doubled, and as the sinusoid parts are reversed, the system performance is improved.

Abstract: Embodiments of this disclosure provide a multicarrier modulation apparatus and method, a multicarrier demodulation apparatus and method and a system. In the embodiments of this disclosure, a new semi-orthogonal multicarrier waveform is designed for data modulation, odd-numbered subcarriers and even-numbered subcarriers of the waveform being respectively orthogonal to each other, but odd-numbered and even-numbered carriers being not orthogonal to each other. In comparison with legacy orthogonal frequency division multiplexing (OFDM) multicarrier, a subcarrier spacing of such multicarrier signal is halved. Hence, the spectral efficiency is doubled.

Abstract: A digital communication system including a terminal and a plurality of base stations. The terminal includes receiving of a first control channel which is transmitted only from the first base station, the received first control channel is configured to indicate resource assignment for both data transmitted from the first base station and data coordinately transmitted from the second base station, and is configured to indicate new data or retransmission data. The terminal a second control channel including first control information and second control information only to the first base station. The first control information is channel state information, and the second control information is Hybrid Automatic Repeat reQuest (HARQ) acknowledgement information for the received data coordinately transmitted. The second control information is based on a result of the HARQ process of the received data coordinately transmitted, and the second control channel is transmitted only to the first base station.

Abstract: A method and system are provided for scheduling data transmission in a Multiple-Input Multiple-Output (MIMO) system. The MIMO system may comprise at least one MIMO transmitter and at least one MIMO receiver. Feedback from one or more receivers may be used by a transmitter to improve quality, capacity, and scheduling in MIMO communication systems. The method may include generating or receiving information pertaining to a MIMO channel metric and information pertaining to a Channel Quality Indicator (CQI) in respect of a transmitted signal; and sending a next transmission to a receiver using a MIMO mode selected in accordance with the information pertaining to the MIMO channel metric, and an adaptive coding and modulation selected in accordance with the information pertaining to the CQI.

Abstract: A wireless communication system, includes a first wireless base station; a second wireless base station that performs a coordinated transmission; and a wireless terminal, wherein the wireless terminal includes a reception control unit that identifies a physical downlink channel transmitted from any of the first and second wireless base station according to one or more reference signals; a data reception unit that is capable of receiving data transmitted by the first wireless base station using a resource indicated by a first control channel and receiving data coordinately transmitted by the second wireless base station using a resource indicated by the received first control channel, a control channel transmission unit that transmits a second control channel and the reception control unit further controls Hybrid Automatic Repeat reQuest (HARQ) process for data coordinately transmitted by the first wireless base station and the second wireless base station based on the first control channel.

Abstract: A system and method for scheduling cooperative uplink transmissions in a virtual multiple input multiple output (MIMO) wireless communication environment are provided. More specifically, both random and channel aware orthogonal scheduling techniques for identifying a sub-set of N mobile terminals to provide cooperative uplink transmissions for each transmit time interval are provided.

Abstract: A new method of performing interference estimation to allow the data packets to be efficiently delivered in an OFDM system. The interference estimation is performed on average over each frame for each mobile station individually in both frequency and time domains. Based on the estimated interference, the CIR can be determined by the BTS based on channel response estimates made by the BTS, or by the MS based on channel response estimates made for the uplink assuming a symmetrical channel. Numerical results show that the CIR estimation error could be very small if a sub-channel is considered as the minimum transmission unit. In terms of the aggregate throughput, the interference estimation method can provide a significant gain.

Abstract: A first base station and a second base station perform a coordinated transmission process to a wireless terminal. The first base station includes a transmission unit that transmits to the wireless terminal a first control channel which indicates new data or retransmission data. The wireless terminal includes: a control channel reception unit; a data reception unit for receiving data from the first base station and data coordinately transmitted from the second base station using a resource which is indicated by the first control channel; a control channel transmission unit that transmits a second control channel related to a retransmission of the data received by the data reception unit to at least the first base station; and a reception control unit that controls Hybrid Automatic Repeat reQuest (HARQ) process for data coordinately transmitted by at least the first base station and the second base station based on the first control channel.

Abstract: A method for resource allocation, method for channel state information transmission, base station and user equipment. Wherein the method for resource allocation includes: determining, by a base station, that it is necessary for a UE to report aperiodic CSI of relevant downlink CCs; and allocating, by the base station, corresponding resources to the UE according to the number of the relevant downlink CCs. The base station allocates corresponding resources to the UE in accordance with the number of relevant downlink CCs, resource allocation is flexible, and the transmission of UCI in case of multiple carriers is supported.

Abstract: Embodiments of this disclosure provide a method and apparatus for feeding back channel state information, a user pairing method and apparatus, a data transmitting method and apparatus and a system. In one embodiment, the apparatus for feeding back channel state information includes: a feedback unit configured to feed back channel state information to an eNB, the channel state information including a precoding matrix index (PMI); a first channel quality indicator (CQI1) corresponding to the PMI; and azimuth angle reference information. With a new CSI feedback mechanism of the embodiments of this disclosure, an eNB may avoid selecting UEs with a relatively large azimuth angle for pairing, and may only select or preferentially select UEs with a relatively small azimuth angle for pairing, thereby preventing loss of gains of beamforming of paired UEs, and improving performance of MUST transmission.

Abstract: Embodiments of this disclosure provide a method and an apparatus for transmitting demodulation reference signals and a system. In an embodiment, the method is applicable to a long term evolution (LTE) communication system, the LTE communication system including first equipment and second equipment, the first equipment and the second equipment communicating via a sidelink, and the method includes: the first equipment transmits additional demodulation reference signals (DMRSs) to the second equipment via the sidelink, the additional DMRSs being located in the last orthogonal frequency division multiplexing (OFDM) symbol of each subframe of the sidelink. With the embodiments of this disclosure, new DMRS sequences are proposed and are placed in the last symbol of a subframe of the sidelink of the LTE system for transmission, thereby enhancing original DMRSs, and improving accuracy of channel estimation.

Abstract: A method for starting inter-frequency measurement is provided. The method is applied to an inter-frequency network, the inter-frequency network includes a first base station and a second base station, there is an overlapping area between a signal coverage area of the first base station and a signal coverage area of the second base station, and an access priority of the second base station is higher than an access priority of the first base station; user equipment accesses the first base station; a distance between the second base station and an AP is less than a first distance threshold, and the AP is controlled by an AC. The method includes: receiving, by the AC, a user authentication request; obtaining an identifier of the user equipment from the user authentication request; and sending an inter-frequency measurement request to the user equipment according to the identifier of the user equipment.

Abstract: A method and system are provided for scheduling data transmission in a Multiple-Input Multiple-Output (MIMO) system. The MIMO system may comprise at least one MIMO transmitter and at least one MIMO receiver. Feedback from one or more receivers may be used by a transmitter to improve quality, capacity, and scheduling in MIMO communication systems. The method may include generating or receiving information pertaining to a MIMO channel metric and information pertaining to a Channel Quality Indicator (CQI) in respect of a transmitted signal; and sending a next transmission to a receiver using a MIMO mode selected in accordance with the information pertaining to the MIMO channel metric, and an adaptive coding and modulation selected in accordance with the information pertaining to the CQI.

Abstract: Spatial multiplexing and transmit diversity can improve the capacity of a wireless communication system. The system and method adapts communication schemes for communication systems with multiple antennas utilizing at least two transmission modes. The at least two transmission modes can, but are not necessarily, used for uplink communications. The two transmission modes may be chosen from the group consisting of a single antenna mode, a diversity mode a spatial multiplexed mode and a mixed diversity and spatial multiplexed mode. The at least two transmission modes may involve adaptation among multiple transmitters. At least one receiver may indicate a transmission mode to be used by a transmitter for a subsequent transmission. A transmitter may determine a transmission mode to be used for a subsequent transmission. The transmission mode can be based on channel sounding.

Abstract: A user equipment (UE), including: a receiver configured to receive downlink data transmitted by a base station via downlink component carriers including a secondary component carrier; and a circuit configured to select uplink resources from available resources for transmitting response signals obtained by decoding the received downlink data and select corresponding modulation symbols by using a mapping relation between a state of the response signals and the selected resources and the modulation symbols according to the state of the response signals; wherein the available resources include resources corresponding to a primary component carrier and resources allocated to the secondary component carrier by the base station; and, wherein the mapping relation includes cases in which the resource corresponding to the response signal that is NACK/DTX is not selected; where NACK represents Negative Acknowledgement, and DTX represents Discontinuous Transmission; and when the response signals are all DTX, no resource

Abstract: A new method of performing interference estimation to allow the data packets to be efficiently delivered in an OFDM system. The interference estimation is performed on average over each frame for each mobile station individually in both frequency and time domains. Based on the estimated interference, the CIR can be determined by the BTS based on channel response estimates made by the BTS, or by the MS based on channel response estimates made for the uplink assuming a symmetrical channel. Numerical results show that the CIR estimation error could be very small if a sub-channel is considered as the minimum transmission unit. In terms of the aggregate throughput, the interference estimation method can provide a significant gain.