Abstract:
Methods, systems, and devices for updating beam-based communications are described. A base station may configure a user equipment (UE) with a set of beam management configurations, which may be used to modify (e.g., dynamically or periodically) beam-based communications. For example, the base station may indicate a beam configuration for utilization by the UE and the UE may switch to the indicated beam configuration or update a currently used beam configuration based on the indication. In another example, a set of beam configurations may be sequentially ordered, and the base station may indicate to the UE to use the next beam configuration in the sequence of beam configurations. The update to the beam configuration may be triggered based on a distance change (e.g., UE and base station getting closer or farther apart) or a reference signal measurement between the UE and the base station, among other factors.
Abstract:
Various embodiments disclosed herein provide for a beam reporting and identification system that can use two different types of signals as reference signals when reporting on beam strengths. The user equipment device can send a unified report that reports on each of the different types of reference signals using a unified beam index. In an embodiment, the first type of reference signal can be a user equipment (UE) specific reference signal, such as a channel state information reference signal (CSI-RS), while the second type of signal used as a reference signal can be a synchronization signal (SS), received as an SS block. The unified index, where SS blocks are grouped into a number of groups, allows for the same number of bits to report on both synchronization signals and CSI-RS signals in the same report.
Abstract:
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present disclosure proposes a method and an apparatus for determining channel state information (CSI) to be reported according to a plurality of channel state reporting priority if periodic channel state information reporting collide with each other, and reporting the channel state information.
Abstract:
A user equipment (UE) may be configured to perform a random access channel (RACH) procedure with a base station. As part of the RACH procedure, the base station may transmit a contention resolution message to the UE. The UE may receive, from the base station, the contention resolution message. The contention resolution message may indicate at least a beam index corresponding to a beam, such as a transmit beam of the base station. The UE may determine whether the beam index is applicable to the UE. The UE may communicate with the base station through the beam corresponding to the beam index when the beam index is applicable to the UE. For example, the UE may send an acknowledgement message to the base station, and the base station and UE may switch to a beam corresponding to the beam index after communication of the acknowledgement message.
Abstract:
When beamforming (e.g., via a millimeter wave system (mmW)) is used for wireless communication, a base station may transmit beams that are directed to certain directions. Due to the directional nature of the beams in the mmW system, an approach to determine a beam that provides a desirable gain is studied. The apparatus may be a user equipment (UE). The apparatus receives, from a base station, a plurality of signals through a plurality of beams of the base station, each of the plurality of beams corresponding to a respective antenna port of a plurality of antenna ports of the base station. The apparatus performs channel estimation for each beam of the plurality of beams from the plurality of antenna ports based on the plurality of signals. The apparatus transmits, to the base station, a feedback signal including information about one or more beams selected from the plurality of beams, the feedback signal further including one or more candidate uplink precoders.
Abstract:
Embodiments of the present disclosure provide a method and an apparatus of determining channel information for a channel. The method comprises receiving a channel state information-reference signal (CSI-RS) from a base station, the CSI-RS being transmitted by the base station with a CSI-RS resource mapped to a part of transmitting antenna ports in an antenna array. The method further comprises determining, by measuring the CSI-RS, partial channel information for the channel corresponding to the part of transmitting antenna ports. In addition, the method further comprises determining overall channel information for the channel based on the partial channel information.
Abstract:
A method and apparatus optimize antenna precoder selection with coupled antennas. A data signal can be received (910). The data signal can be precoded (920). The precoded data signal can be scaled using a precoder-dependent scaling factor (940). The scaled precoded data signal can be transmitted through a plurality of antennas (960).
Abstract:
The invention relates to a first communication device for a wireless communication system (500), the first communication device (100) comprising: a processor (102), a cascade precoder (104) including an outer precoder (106) and an inner precoder (108), and a transceiver (110); wherein the processor (102) is configured to determine the inner precoder (108); wherein the transceiver (110) is configured to transmit a first pilot sequence (P1) to a second communication device (300), the first pilot sequence (P1) being precoded with the determined inner precoder (108) by the processor (102); wherein the transceiver (110) is configured to receive a first channel estimation (CHE1) from the second communication device (300) in response to the transmission of the first pilot sequence (P1); wherein the processor (102) is configured to determine the outer precoder (106) based on the first channel estimation (CHE1); wherein the transceiver (110) is configured to transmit at least one of a data sequence and a pilot sequence to the second communication device (300). Furthermore, the invention also relates to corresponding methods, a wireless communication system, a computer program, and a computer program product.
Abstract:
In one aspect of this disclosure, a communication device sends first and second precoding reports to a network node by time multiplexing the first and second precoding reports onto a reporting channel in accordance with a multiplexing ratio. The first and second precoding reports comprise first and second precoding recommendations,respectively, and correspond to the first and second dimensions of an antenna array used for transmitting to the communication device. Among other advantages, multiplexing of the first and second reports enables the communication device to reuse a reporting channel and at least some of the underlying reporting protocols or signaling arrangements to report multi-dimensional precoding information. The corresponding network node uses its knowledge of the multiplexing ratio to differentiate between the first and second reports. Moreover, the involved multiplexing ratio may be adapted, either by the network or the communication device, in view of changing operating scenarios.