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 receiving, by the base station, a preferred MIMO mode related information from a mobile station; determining a MIMO mode based on the preferred MIMO mode related information; reporting the MIMO mode to the mobile station; and receiving a feedback information of the MIMO mode from the mobile station.
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:
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 method for efficiently transmitting and receiving downlink control information is disclosed. The method includes, at a base station, receiving feedback information including a precoding matrix index (PMI) from a user equipment (UE) and transmitting precoding information having a predetermined bit number according to the number of antenna ports and a transmission mode of the base station. The precoding information of a predetermined transmission mode in the precoding information includes confirmation information indicating that the base station uses a PMI which is recently received from the UE.
摘要:
A user equipment (UE) receiving a plurality of reference signals in a wireless multiple-input multiple-output (MIMO) communication system includes a transceiver configured for receiving the plurality of reference signals for multiple antennas in a sub-frame, the sub-frame including a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in a time domain over a plurality of sub-carriers in a frequency domain. A first array is repeated in the frequency domain on a first OFDM symbol of the sub-frame, a second array is repeated in the frequency domain on a second OFDM symbol of the sub-frame and a third array is repeated in the frequency domain on a third OFDM symbol of the sub-frame, and each of the first, second and third arrays consists of six contiguous symbols in the frequency domain.
摘要:
A method of transmitting feedback data in a multiple antenna system comprises receiving a request message of feedback data on a downlink channel, the request message comprising uplink scheduling information, selecting a set of M (M≧1) subbands within a plurality of subbands, generating the feedback data, the feedback data comprising a frequency selective PMI (precoding matrix indicator), a frequency flat PMI, a best band CQI (channel quality indicator) and a whole band CQI, and transmitting the feedback data on a uplink channel allocated to the uplink scheduling information.
摘要:
A method of transmitting an acknowledgment (ACK)/non-acknowledgement (NACK) signal in a wireless communication system includes assigning at least one ACK channel among a plurality of ACK channels which share an ACK channel region for transmitting the ACK/NACK signal, and transmitting the ACK/NACK signal through the at least one ACK channel, wherein the ACK channel region includes at least one tile including a plurality of data subcarriers, and the ACK/NACK signal of each ACK channel is indicated by mapping different orthogonal vectors respectively to the plurality of ACK channels in the tile.
摘要:
A method of downlink subchannelization in a wireless communication system includes: transmitting a network entry and network discovery information including an open loop (OL) region parameter; and mapping a physical resource unit (PRU) to a contiguous resource unit (CRU) or a distributed resource unit (DRU) with respect to ith frequency partition based on the OL region parameter, wherein a permutation sequence used for mapping a PRU of the ith frequency partition (PRUFPi) to a CRU of the ith frequency partition (CRUFPi) or a DRU of the ith frequency partition (DRUFPi) is determined by a seed value, and the seed value is set to be a particular value according to the value of the OL region parameter.
摘要:
A method for performing a precoding based on a generalized phase shift or a precoding based on an extended phase shift in a Multi-Input Multi-Output (MIMO) system employing several sub-carriers, and a transceiver for supporting the same are disclosed. A phase-shift-based precoding matrix is generalized by multiplying a diagonal matrix for a phase shift by a unitary matrix for maintaining orthogonality between sub-carriers. In this case, a diagonal matrix part may be extended by multiplying a precoding matrix for removing interference between sub-carriers by a diagonal matrix for a phase shift. By generalization and extension of the phase-shift-based precoding, a transceiver is more simplified, and communication efficiency increases.
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.