摘要:
A method for operating a communications controller includes selecting a search space configuration out of a set of candidate search space configurations for a user equipment served by the communications controller, wherein the search space configuration specifies one or more search spaces to be monitored out of a set of search spaces, and signaling the selected search space configuration to the user equipment.
摘要:
Embodiments of the present invention disclose methods and apparatuses for receiving and sending a control channel, and are applicable to the field of communications technologies. In the embodiments of the present invention, a base station carries scheduling information of a user equipment of an R11 system in both the PDCCH region and the E-PDCCH region of a downlink subframe. In this way, the user equipment needs to detect the control channel within the PDCCH region and the E-PDCCH region, so that resources of the two regions are available to the user equipment of the R11 system. Moreover, the user equipment detects only the control channel of the first type in the PDCCH region, and detects control channels of the other type in the E-PDCCH region. The method in the embodiments of the present invention does not increase the number of control channel detections.
摘要:
Reporting of channel state information (CSI) between a transmit node (TN) and a receive node (RN) in wireless communications is disclosed. For a TN being arranged for multiple transmit antenna transmissions and the CSI being represented by K matrix/matrices, W i , from a codebook, C , comprising a plurality of matrices; wherein each matrix in said codebook, C , represents a state for the multi-antenna channel from the TN to the RN, K ‰¥ 1 and i = 0... K -1; a first sub-index, k 1 , and at least one second sub-index, k 2 , are reported for each one of the K matrix/matrices, W i , wherein each one of the K matrix/matrices, W i , is indexed by the first and second sub-indices, and the first and second sub-indices have different time-frequency reporting granularity.
摘要:
Embodiments of the present invention provide a channel measurement and feedback method, a network device, and a system, and relate to the field of communications technologies. The method includes: receiving, by a first network device, pilot port configuration information sent by a second network device, where the pilot port configuration information is used to describe at least two pilot ports; measuring, by using the at least two pilot ports, a pilot signal sent by the second network devi ce, and determining first information, where the first information includes at least one of second information of the first network device or third information of a third network device when it is assumed that the first network device and the third network device communicate with the second network device by performing spatial multiplexing on a same time frequency resource, the second information includes at least one of information about a pilot port used by the first network device, an RI used by the first network device, a PMI used by the first network device, or a CQI, and the third information includes at least one of information about a pilot port used by the third network device, an RI used by the third network device, a PMI used by the third network device, or a CQI; and feeding back the first information to the second network device. The present i nventi on improves accuracy of channel measurement.
摘要:
In a 3D MIMO scenario with 16 antenna ports, antenna ports can be extended in different directions because of different configuration manners of the antenna ports. In this embodiment, different antenna port counting manners are determined in different configurations, so that in all the different configurations, a matrix whose dimension is 8 and a matrix whose dimension is 2 are determined in a precoding codebook, and a value of the PMI is fed back to indicate a precoding matrix, thereby reducing configuration signaling and reducing air interface resources.
摘要:
Embodiments of the present invention provide a method for enhanced transmission of control information, user equipment, a base station, and a communications system. The method includes: determining a first parameter for enhanced transmission of control information; and performing enhanced transmission of the control information according to the first parameter. Between a base station and UE, a k th subframe after a last subframe in enhanced transmission of control information may be preset as a start subframe in enhanced transmission of a PDSCH, a j th subframe after the last subframe in enhanced transmission of the control information may be preset as a start subframe in enhanced transmission of a PUSCH, and a start subframe in enhanced transmission of the control information is preset, where the subframes may also be radio frames. The UE can determine a quantity of repetitions of enhanced transmission of the control information according to one or more of the preset start subframe, the preset radio frame, and the first parameter. Therefore, the user equipment can accurately determine the last subframe and/or radio frame occupied by the control information, and further, can accurately determine a start time for receiving the repeatedly transmitted PDSCH or a start time for repeatedly transmitting the PUSCH, thereby ensuring performance of the PDSCH or PUSCH, where the start time includes the start subframe and/or the start radio frame.
摘要:
Embodiments of the present invention provide a method for generating a random access channel ZC sequence, and an apparatus. A method for generating a random access channel ZC sequence includes: generating, by a base station, notification signaling, where the notification signaling is used to instruct user equipment UE to generate a random access ZC sequence by using a second restricted set in a random access set; and sending, by the base station, the notification signaling to the UE, so that the UE generates the random access ZC sequence by using the second restricted set, where the random access set includes an unrestricted set, a first restricted set, and the second restricted set; and the second restricted set is a random access set that the UE needs to use when a Doppler frequency shift of the UE is greater than or equal to a first predetermined value, and the first predetermined value is greater than one time a physical random access channel PRACH subcarrier spacing.
摘要:
The present invention discloses a method and a device for transmitting channel state information, where the method includes: determining, by a first network device according to measurement of a reference signal sent by a second network device, channel state information including a precoding matrix indication PMI and selection information that is used to instruct to select a matrix element in a precoding matrix indicated by the PMI; and sending the channel state information to the second network device. Because the channel state information includes the precoding matrix indication PMI used to instruct the second network device to perform precoding and the selection information that is used to instruct to select a matrix element in a precoding matrix indicated by the PMI, the second network device can determine, according to the selection information for the matrix element, a precoding matrix for performing precoding, and synthesize a channel precoding matrix applicable to a two-dimensional antenna. Therefore, dimensions of the synthesized precoding matrix are closer to a spatial feature of a real channel, which effectively improves precision of a precoding matrix.