Abstract:
An apparatus implements methods for random access in a wireless communication system using beamforming. A Subscriber Station (SS) measures a best downlink transmission beam among downlink transmission beams transmitted from a Base Station (BS), and transmits Random Access Channel (RACH) information, which includes indication information indicating the best downlink transmission beam, to the BS. The BS receives RACH information which includes indication information indicating a best downlink transmission beam among downlink transmission beams, and detects a RACH sequence and the best downlink transmission beam from the received RACH information.
Abstract:
An apparatus implements methods for random access in a wireless communication system using beamforming. A Subscriber Station (SS) measures a best downlink transmission beam among downlink transmission beams transmitted from a Base Station (BS), and transmits Random Access Channel (RACH) information, which includes indication information indicating the best downlink transmission beam, to the BS. The BS receives RACH information which includes indication information indicating a best downlink transmission beam among downlink transmission beams, and detects an RACH sequence and the best downlink transmission beam from the received RACH information.
Abstract:
The present disclosure relates 5G or pre-5G communication systems for supporting higher data transmission rate than those by LTE or other post-4G communication systems. According to the present disclosure, a method for operating a beamformed reference signal by a base station and terminal in a communication system, and the terminal, are provided. The method includes transmitting, to a terminal, control information indicating whether a first codebook is used for generating feedback information on a downlink reference signal. The first codebook is used if generating feedback information on the beamformed reference signal and is generated based on a number of antenna ports and a number of ranks.
Abstract:
The present disclosure relates to a pre-5th-generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-generation (4G) communication system such as long term evolution (LTE).The method includes: receiving information on a battery threshold of a terminal from a base station; determining whether to use a reception beam width wider than a currently used reception beam width, by comparing a battery level of the terminal with the battery threshold; transmitting additional resource request information to the base station when it is determined that a wider reception beam width is used; and when an additional resource corresponding to the additional resource request information is allocated from the base station, blocking a power supply of at least one antenna reception circuit among multiple antenna reception circuits corresponding to multiple antenna elements in order to form at least one reception beam having the wide reception beam width.
Abstract:
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). Embodiments of the present invention provide a method and an apparatus for adaptively determining a beam sweeping pattern of a base station in a beamforming-based wireless communication system. An embodiment of the present invention provides an operating method of a serving base station in a wireless communication system, the operating method comprising: receiving, from at least one terminal, beam collision information indicating a collision between beams received from the serving base station and at least one neighboring base station adjacent to the serving base station; and adjusting a beam sweeping pattern of a beam transmitted to the at least one terminal on the basis of the received beam collision information. Various other embodiments of the present invention are also disclosed.
Abstract:
A Base Station (BS) cooperative communication method in a wireless communication system is provided. The BS cooperative communication method includes measuring signal quality of one or more neighboring BSs, comparing a number of downlink beams available for communication between a serving BS and a Mobile Station (MS) with a reference value, determining not to involve the one or more neighboring BSs in BS cooperative communication for the MS when the number of downlink beams is equal to or larger than the reference value, comparing signal measurements of the one or more neighboring BSs with a first threshold when the number of downlink beams is smaller than the reference value, and determining to involve one or more neighboring BSs having a signal measurement value larger than the first threshold in the BS cooperative communication for the MS.
Abstract:
Provided is a method and apparatus for transmitting and receiving a Broadcast Channel (BCH) in a cellular communication system. The method for transmitting a BCH in a cellular communication system includes repeating symbols comprising information about the BCH, code-covering the repeated symbols with codes selected from a previously given code set, subcarrier-mapping the code-covered symbols, and transmitting the subcarrier-mapped symbols in one frame by using different beams corresponding to the selected codes. The codes are selected based on a number of repetitions, a cell identifier, and a beam index.
Abstract:
The present invention relates to a method for operating, by a base station, multiple modulation schemes in a wireless communication system, the method comprising the steps of: calculating the number of terminals, among the terminals in a cell managed by the base station, of which a channel state is included in a state that is lower than a preset state; reporting information related to the calculated number of terminals to an upstream entity of the base station; receiving information about a band, assigned by the upstream entity, for a hybrid frequency shift keying (FSK) and quadrature amplitude modulation (QAM) (FQAM) scheme on the basis of a QAM scheme and a FSK scheme; and transmitting downwardly the information about the band for the FQAM scheme to the terminals of which a channel state is included in a state that is lower than the preset state. Other modified embodiments on the basis of the technical concept of the present invention are also possible.
Abstract:
A method of a terminal that forms beams and a device for performing beam tracking in a communication system that supports beamforming are provided. The method includes detecting, by the terminal, an object located at a periphery of the terminal and performing beam tracking through beams formed by the terminal, except for a beam that is formed in a direction in which the detected object is located.
Abstract:
A data transmission method for a base station to acquire transmission beam diversity in a wireless communication system is provided. The data transmission method includes selecting at least two transmission beams to be used for data transmission from among multiple transmission beams corresponding to transmission beam information, if receiving the transmission beam information regarding the multiple transmission beams from a terminal, and transmitting data encoded with a predetermined orthogonalization code to the terminal via the selected at least two transmission beams.