Abstract: Embodiments of the disclosure provide a method and apparatus for enhancing coverage in a TDD system, wherein there is at least one TDD UL/DL configuration for subframes in the TDD system, and the at least one UL/DL configuration comprises at least one special subframe and at least one normal subframe. In the method according to embodiments of the present invention, whether a special subframe is to be applied in TTI bundling is determined first, and then a message with an indication indicating that a special subframe is to be applied in TTI bundling is sent to a UE in response to determining that a special subframe is to be applied in TTI bundling, such that the UE transmits TTI bundling packets on at least one special subframe.

Abstract: The present invention provides a method and apparatus for indicating downlink channel measurement and a method and apparatus for performing channel measurement. The method for indicating downlink channel measurement comprises: receiving information on interferes of a user equipment; generating, based on downlink subframe configuration information, a downlink channel measurement indication for each of possible combinations of the interferers, wherein the channel measurement indication is adapted to indicate a subframe group to be measured by a user equipment; and sending the downlink channel measurement indication to the user equipment so as to indicate the user equipment to perform corresponding downlink channel measurement. According to embodiments of the present invention, the subframe groups that are required to be measured by the user equipment may be determined with respect to possible combinations of interferers corresponding to different levels of interference.

Abstract: The present invention relates to a method for link adaptation in a wireless communication system. The method comprises: determining whether a UE operates in a SU-MIMO transmission mode or in a MU-MIMO transmission mode; applying, in responsive to determination that the UE operates in the SU-MIMO transmission mode, a SU-MIMO OLLA offset to a signal to interference and noise ratio adjusted with inner loop link adaptation; applying, in responsive to determination that the UE operates in the MU-MIMO transmission mode, a MU-MIMO OLLA offset to a signal to interference and noise ratio adjusted with inner loop link adaptation, wherein the MU-MIMO OLLA offset is based on the SU-MIMO OLLA offset and an extra offset which is indicative of inter-user interference, wherein the SU-MIMO OLLA offset and the extra offset are updated in responsive to receipt of an ACK/NACK message for a packet reported from the UE.

Abstract: Embodiments of the present disclosure relate to uplink data transmission in a wireless communication system. In an embodiment of the present disclosure, there is provided a method for uplink data transmission in a wireless communication system. The method comprises transmitting an indication for new-type reference signals to a user equipment, wherein the new-type reference signals have a reduced density of reference signals in frequency domain, and resource elements not used by reference signals in symbols for the new-type reference signals are used for coverage enhancement; receiving the new-type reference signals; and performing channel estimation based on the new-type reference signals. With embodiments of the present disclosure, it may reduce the density of reference signals in frequency domain, which means the overhead will not be increased substantially and besides saved resource element may be used to implement the coverage enhancement.

Abstract: Disclosed is a method and device for processing a time sequence based on dimensionality reduction, belonging to the technical field of computers. The method includes: acquiring at least one to-be-processed time sequence; processing the at least one time sequence based on Piecewise Linear Approximation (PLA) where a time length of a time segment processed by PLA is unfixed and is an integral multiple of a preset unit time length. According to the present disclosure, a space for storing a time sequence may be reduced.

Abstract: Embodiments of the disclosure provide a method and apparatus for dynamically adjusting UL-DL configuration. In the method according to embodiments of the present invention, downlink traffic load and uplink traffic load for transmission between a BS and a UE in a TDD system may be obtained, a UL-DL traffic load relation may be determined based on the downlink traffic load and the uplink traffic load and a UL-DL configuration may be selected based on the UL-DL traffic load relation.

Abstract: Embodiments of the present disclosure relate to methods and apparatuses for channel estimation and feedback in a three dimensional multiple input multiple output (3D-MIMO) system. A method may comprise: transmitting a plurality of reference signals for a plurality of columns in an antenna array; receiving indication information on configuration adjustment of a precoding information feedback, wherein the indication information is based on measurement on the plurality of reference signals; and adjusting a configuration of the precoding information feedback based on the indication information so that a multiple vertical precoding information feedback is enabled when it can obtain a performance gain. Especially, the multiple vertical precoding information feedback may represent feeding back a plurality of vertical precoding matrix indicators for the plurality of columns in the antenna array.

Abstract: A method for predicting precoding matrix (PM) in a MIMO System includes the steps of: obtaining a present PM based on a present transmission; fitting the present PM and previous PMs with a predefined model; and determining a forthcoming PM which is expected to be used in the next transmission based on the fitting.

Abstract: The present disclosure provides a method and an apparatus for determining transmission power for a base station. The method may comprise receiving information on link resource configuration of at least one interfered base station; determining the transmission power for the base station, based on link resource configuration for the base station and the information on link resource configuration of the at least one interfered base station. With embodiments of the present invention, it is possible to provide a new power control scheme by which the cross-subframe co-channel interference might be mitigated and thus the uplink performance of a user equipment, and besides, the downlink performance of the edge UE might also be improved. Additionally, the present disclosure also provides a method and apparatus for providing information for power determination.

Abstract: The present invention provides a method and apparatus for determining a transmission power of a secondary transmitter in a hierarchical spectrum sharing system. The method can comprise steps of obtaining channel quality information on a primary link from at least one primary receiver within a transmission range of the secondary transmitter; and determining the transmission power for the secondary transmitter based on the channel quality information, wherein the transmission power is matched with the channel quality indicated by the channel quality information. According to the embodiments of the present invention, a power control scheme is applied to the secondary transmitter based on the channel quality information on the primary link. In such a way, the secondary transmitter' throughput can be improved with controllable rate loss to the primary receiver and accordingly the spectrum efficiency for the whole system can be further upgraded.

Abstract: Embodiments of the disclosure provide a method and apparatus for resource sharing for D2D and cellular communications in a multicell network. The method comprises steps of: acquiring CSI on channels relating to D2D pair and a plurality of cellular users that potentially share resources with the D2D pair; and determining D2D transmit powers of the D2D pair on a plurality of frequency bands allocated to the plurality of cellular users and cellular transmit powers of the plurality of cellular users based on the CSI, to improve throughput of the multicell network.

Abstract: The present invention relates to method and apparatus for channel direction information feedback in a heterogeneous system. According to an embodiment of the present invention, a method for channel direction information feedback in a heterogeneous system comprises: determining, for a user equipment, total feedback bits for quantization of channel direction information, based on a trade off between accuracy of channel direction information quantization and reliability of uplink feedback transmission on a predetermined uplink feedback resource, wherein coordinated multi-point transmission between a local base station and a cross base station is performed for the user equipment in the heterogeneous system; and notifying said user equipment of said total feedback bits for quantization of channel direction information that will be conveyed on said predetermined uplink feedback resource.

Abstract: A data indexing system is provided. The system includes: a time interval splitting unit configured to split a predetermined time range into a plurality of time intervals. A first index creating unit is configured to create a first-level index for data in a current time interval, the first-level index including a time interval index and a subspace index. A second index creating unit is configured to create, in a time interval after the current time interval, a second-level index for data in the current time interval. The second-level index has a finer granularity than the first-level index. A data indexing method and a data querying method are also provided. The cost for index maintenance can be greatly reduced in a case of frequent updates. Further, invalid scans during the query process can be reduced and the query performance can be improved.

Abstract: Embodiments of the present disclosure relate to downlink/uplink data transmission in a wireless communication system. In an embodiment of the present disclosure, there is provided a method for downlink data transmission in a wireless communication system which comprises transmitting an indication for a new-type reference signal to a user equipment, wherein the new-type reference signal has an identical location in frequency domain to a legacy reference signal; and transmitting the new-type reference signal and the legacy reference signal to the user equipment for using in channel estimation. In a case of more than one antenna port, the new-type reference signal may be designed to have a different location in time domain from a legacy reference signal to avoid interference to other antenna ports.

Abstract: Embodiments of the disclosure provide methods and apparatuses for performing D2D communication in a communication system. The communication system at least comprises a BS and a UE in cellular communication with the BS, and wherein the D2D communication is performed between a D2D transmitter and a D2D receiver and interferes with the cellular communication. A method according to the disclosure may comprise steps of: obtaining MCS information on the cellular communication between the BS and the UE; and determining a transmitting power for the D2D communication based on the MCS information, so as to reduce the interference from the D2D communication to the cellular communication.

Abstract: The present invention discloses a method and apparatus of performing outer loop link adaptation (OLLA) operation. This method may comprise: accelerating in an initial probing phase, increase of an OLLA scaling factor until obtaining a negative result regarding codeword selection; and fine modifying, in a fine modification phase, the scaling factor using an upturn factor and a downturn factor in response to the result regarding codeword selection so that a channel quality indication, which is modified using the scaling factor, is matched with its actual value. Compared with the prior art, the technical solution as provided in the present invention can quickly modify a CQI to match its actual value, thus this solution may effectively mitigate the CQI mismatch, improve the CQI feedback accuracy, and further enhance the cell throughput performance and frequency utilization.

Abstract: Embodiments of the disclosure provide a method and apparatus for reconfiguring DL-UL resource allocation in a TDD system. The method includes steps of: a) obtaining traffic condition about DL and UL data to be transmitted; b) estimating system-wise transmission capability and/or UE-wise transmission capability, wherein the system-wise transmission capability accounts for DL transmission capability and UL transmission capability of the TDD system, and the UE-wise transmission capability accounts for transmission capabilities of different UEs; and c) reconfiguring the DL-UL resource allocation according to the obtained traffic condition and the estimated system-wise transmission capability and/or UE-wise transmission capability.

Abstract: The present invention discloses a method and an apparatus for primary synchronization signal (PSS) detection. The method may comprise: performing a central-symmetrical preprocess on a receive vector by exploiting a central symmetry of the primary synchronization signal; and performing, based on the central-symmetrical preprocess, a non-coherent detection on the receive vector using local primary synchronization signals so as to detect the primary synchronization signal. The computation complexity in PSS detection may be significantly reduced by performing preprocess to the receive vector based on the central symmetry of the primary synchronization signal, thereby considerably enhancing the speed and performance of PSS search and further improving the cell search efficiency.

Abstract: Embodiments of the disclosure provide a method and apparatus for cross-subframe interference coordination in a dynamic TDD system. The method comprises steps of: obtaining UL-DL configurations employed by a plurality of cells in the dynamic TDD system; and determining, based on the UL-DL configurations, a beamforming vector of at least one interfering cell which has cross-subframe interference on at least one interfered cell, so as to reduce the cross-subframe interference.

Abstract: Embodiments of the present disclosure relate to a method and apparatus for DL/UL resource configuration in a Time Division Duplex (TDD) system. The method may comprise: dividing a plurality of cells into disjoint clusters based on interference conditions among base stations of the plurality of cells; and performing, in each of at least one of the disjoint clusters, a cooperation DL/UL resource configuration on in-cluster cells included therein based on traffic conditions and performance metrics of the in-cluster cells, so as to determine respective DL/UL resource configurations for the in-cluster cells. With embodiments of the present disclosure, time domain resources may be utilized more efficiently and, additionally, it may be expected to achieve a better overall performance at a low cost.