摘要:
A mode adaptation method for performing mode switching between a single-user MIMO (SU-MIMO) mode and a multi-user MIMO (MU-MIMO) mode includes reporting, by a base station, a MIMO feedback mode to a mobile station, receiving a feedback information determined on the basis of the MIMO feedback mode from the mobile station; and determining a MIMO feedback mode based on the feedback information. The MIMO feedback mode indicates whether it is single-user MIMO or multi-user MIMO and includes a number of mobile stations (MSs) transferred at one time. As a result, the method maximizes a system throughput simultaneously while effectively reducing an amount of feedback information.
摘要:
A feedback method for performing a feedback by using a codebook in Multiple Input Multiple Output (MIMO) system includes receiving, by the mobile station, a MIMO mode type information, generating feedback information by using the codebook selected according to the MIMO mode type information, and transmitting the feedback information to the base station. The codebook includes a SU-MIMO codebook and a MU-MIMO codebook, and the MU-MIMO codebook is formed by extracting codebook elements from the SU-MIMO codebook. As a result, the method maximizes a system throughput simultaneously while effectively reducing an amount of feedback information.
摘要:
The present invention relates to a method for requesting an uplink resource in a wireless communication system. In the method according to one aspect of the invention, a terminal transmits a quick access message to a base station and receives a resource from the base station. The quick access message includes a first field that shows the attributes of the data that is supposed to be transmitted by the terminal, and a field that is determined by the first field.
摘要:
The present invention relates to a bandwidth request preamble sequence selecting method for bandwidth requests on a wireless access system, and to a random access procedure using the same. Also, the present invention relates to devices supporting the random access procedure. In one example of the present invention, the method for randomly accessing a wireless access system may comprise the steps of: receiving a first message containing a predefined bandwidth request index from a base station; selecting a bandwidth request preamble sequence from the predefined bandwidth request index on the basis if the properties of uplink data to be transmitted by a mobile terminal; transmitting a second message containing a predefined bandwidth request index to the base station; and transmitting the selected bandwidth request preamble sequence to the base station.
摘要:
A method for performing a bandwidth request procedure in a wireless communication system includes receiving a bandwidth request sequence, which has been selected from a sequence set including a plurality of sequences, via a bandwidth request channel, and selecting a bandwidth request procedure to be performed from among a general bandwidth request procedure and a quick bandwidth request procedure, wherein the sequence set is divided into a plurality of sub-sets corresponding to the general bandwidth request procedure and the quick bandwidth request procedure. The bandwidth request procedure can be quickly and effectively performed.
摘要:
A method for acquiring a multi-cell specific message in a wireless communication system includes receiving a downlink preamble, receiving the multi-cell specific message weighted with the downlink preamble, and decoding the weighted multi-cell specific message by using the received downlink preamble. Accordingly, since a preamble is used to transmit a multi-cell specific message, there is no need to transmit an additional signal in order to estimate a channel of the multi-cell specific message. In addition, a user equipment can acquire the multi-cell specific message by simply performing decoding.
摘要:
A method of transmitting data using a plurality of subcarriers in a multi-antenna wireless communication system is disclosed. More specifically, the method includes receiving feedback information from a mobile station (MS), performing channel encoding and modulation independently on user data to be transmitted by each antenna using the received feedback information, determining a phase shift-based precoding matrix for increasing a phase angle of the user data by a fixed amount, and performing precoding using the determined phase shift-based precoding matrix on the user data.
摘要:
An pet food dispensing device includes a dispenser, an outer case, a pet food container, a slant guide, a driving device, and dispensing spouts. The dispenser includes a shaft, a dispensing disc, a rectangular push-out plate, a semi-circular plate and a stirrer. The dispensing disc includes top and bottom layers, which are positioned adjacently. The top layer of the dispensing disc includes one or more bumps on the top surface. The rectangular foam push out plate turns counter-clockwise dispensing pet food from the upper portion of semi-circular plate towards slant guide. The stirrer of the pet food dispenser includes a first flap extended from the first edge of the bottom layer of the dispensing disc, and the first flap is bent downwardly below the horizontal plane.
摘要:
A method for transmitting a signal on a bandwidth request channel, a mobile station apparatus using the same, a method for performing a bandwidth request procedure in relation to a bandwidth request from a mobile station, and a base station apparatus using the same are disclosed. A mobile station transmits a bandwidth request preamble and a bandwidth request message together to a base station to request a bandwidth. A region of the bandwidth request message may be configured as null tones. In response to the bandwidth request of the mobile station, the base station transmits a BR ACK A-MAP IE indicating reception of the bandwidth request to the mobile station in response to the bandwidth request. The base station transmits an uplink grant to the mobile station by a BR ACK A-MAP IE or a CDMA allocation A-MAP IE. Upon receipt of the uplink grant from the base station, the mobile station transmits uplink scheduled data to the base station. However, if the base station fails to decode the quick access message or the region of the quick access message is filled with null tones, the base station transmits a grant for a bandwidth request header to the mobile station, instead of an uplink grant.