The present disclosure provides a method and device for 3D MIMO communication in a UE and a base station. In an embodiment, in a first step, a UE receives a downlink reference signal in a first RS resource and a second RS resource; in a second step, the UE determines a target RS resource, wherein the target RS resource is the first RS resource or the second RS resource; and in a third step, the UE feeds back a first CI and a first index, wherein the first RS resource comprises N1 RS ports, the second RS resource comprises N2 RS ports, a reference RS of the first CI is the target RS resource, the first index indicates the target RS resource, N1 is a positive integer greater than 1, and N2 is a positive integer greater than 1. By using the technical scheme provided in the present invention, a UE feeds back the most effective CI information by using limited air-interface resources, and therefore overheads of the air-interface resources are reduced or the feedback efficiency of the CI is improved.

One apparatus may be configured to detect a set of beams from a base station. The apparatus may be further configured to select a beam of the set of beams. The apparatus may be further configured to determine at least one resource based on the selected beam. The apparatus may be further configured to transmit, on the at least one determined resource, a beam adjustment request to the base station. The request may indicate an index associated with the selected beam. Another apparatus may be configured to transmit a first set of beams. The other apparatus may be further configured to receive a beam adjustment request on at least one resource. The other apparatus may be further configured to determine a beam index of a beam in the first set of beams based on the request and the at least one resource.

A link adaptation method performed by a station (STA) in a wireless local area network (LAN) system supporting multi-user multiple-input multiple-output (MU-MIMO) is provided. The method includes: receiving a modulation and coding scheme (MCS) request, a steered sounding physical layer convergence procedure (PLOP) protocol data unit (PPDU) which is beam-formed to the STA, and a MIMO indicator including MU-MIMO-related information from an access point (AP); and transmitting feedback information including an MCS acquired from the steered sounding PPDU and the MU-MIMO-related information to the AP in response to the MCS request.

A method for reporting channel state information (CSI) from a user equipment to a base station in a wireless communication system is disclosed. The method comprises the steps of configuring a first feedback chain corresponding to a first channel state information-reference signal (CSI-RS) and a second feedback chain corresponding to a second CSI-RS through higher layer signaling; generating a first partial CSI and a second partial CSI corresponding to each of the feedback chains by using the first and second CSI-RSs received from the base station; periodically reporting the first partial CSI to the base station in accordance with the first feedback chain; and aperiodically reporting the second partial CSI to the base station in accordance with the second feedback chain.

A method and system for processing a downlink pilot signal is disclosed. Herein, the method includes: a receiving end detecting downlink measurement pilot ports to obtain a received signal corresponding to each downlink measurement pilot port on each receiving antenna; performing screening on the downlink measurement pilot ports according to the received signals; calculating a receiving weight vector of each downlink measurement pilot port, and using an uplink precoding weight vector, calculated and obtained by combining the receiving weight vector with uplink and downlink operating frequencies, for data precoding; or, using N uplink precoding weight vectors, calculated and obtained by combining the receiving weight vector with uplink and downlink operating frequencies, for uplink pilot precoding, where N is the number of uplink precoding pilots transmitted, and N is an integer which is greater than or equal to 1. The above technical solution can effectively reduce pilot overhead in communication systems.

A downlink channel estimation method and apparatus based on a sounding reference signal (SRS), and a communications system. The method includes: a base station receives a SRS sent by UE, the SRS being used for downlink channel estimation and supporting high-dimensional MU-MIMO; performing uplink channel estimation according to the SRS; and acquiring downlink channel information according to uplink channel information obtained in the uplink channel estimation. By means of embodiments of the present disclosure, downlink reference signal overheads and feedback overheads can be remarkably reduced, gain brought by large-scale antennas is obtained, and the system capacity can be further improved.

A method for assessing an impact of a design choice on a system level performance metric of a radio access network (RAN) deployed in an environment includes receiving messages from a plurality of UEs over time by a plurality of RNs in the RAN. A design choice is selected for a set of operating parameters of the RAN. One or more of measurement values in each of the received messages and the selected design choice are processed to compute a set of derivatives. A system level performance metric is determined as a function of the computed set of derivatives.

An electronic gateway device includes a network interface configured to electronically wirelessly communicate with first and second client devices; a wide area network (WAN) interface configured to constructively communicate with an Internet; a memory having software stored thereon; and a processor configured to run the software to establish a service set identifier (SSID) for communication with the first and second client devices via the network interface; determine whether the electronic gateway device is presently able to connect to the Internet; upon a determination that the electronic gateway device is not able to connect to the Internet, send: (i) information identifying the SSID, and (ii) a creation request to the first client device to create a wireless hotspot network with the SSID for connection to the Internet; and send a steering instruction to the second client device for steering the second client device to the wireless hotspot network.

A transmission method includes generating a first precoded signal and a second precoded signal by performing a precoding process on a first baseband signal and a second baseband signal, outputting a third signal by inserting a pilot signal into the first precoded signal, outputting a fourth signal by applying a first phase change to the second precoded signal, outputting a fifth signal by inserting a pilot signal into the fourth signal, and outputting a sixth signal by applying a second phase change to the fifth signal.

A beam determining method performed in an uplink random access procedure, a user equipment, and a base station are disclosed. The user equipment has a plurality of RX beams, the base station has a plurality of TX beams. A beam determining method performed by a user equipment includes: determining an available RX beam among the plurality of RX beams of the user equipment and an available TX beam among the plurality of TX beams of the base station according to downlink synchronization signals transmitted by the base station; notifying the base station of information indicating the available TX beam of the base station implicitly.