WO2011108898A2 - Station de base, station mobile, retour à entrées et sorties multiples, procédé de réception et procédé d'émission - Google Patents

Station de base, station mobile, retour à entrées et sorties multiples, procédé de réception et procédé d'émission Download PDF

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Publication number
WO2011108898A2
WO2011108898A2 PCT/KR2011/001531 KR2011001531W WO2011108898A2 WO 2011108898 A2 WO2011108898 A2 WO 2011108898A2 KR 2011001531 W KR2011001531 W KR 2011001531W WO 2011108898 A2 WO2011108898 A2 WO 2011108898A2
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Prior art keywords
mimo feedback
mimo
feedback
period
mobile station
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PCT/KR2011/001531
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English (en)
Korean (ko)
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WO2011108898A3 (fr
Inventor
박지수
이남석
이숙진
박윤옥
권동승
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한국전자통신연구원
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Priority to US13/582,702 priority Critical patent/US20120327882A1/en
Priority to JP2012556025A priority patent/JP2013521694A/ja
Priority claimed from KR1020110019656A external-priority patent/KR20110100604A/ko
Publication of WO2011108898A2 publication Critical patent/WO2011108898A2/fr
Publication of WO2011108898A3 publication Critical patent/WO2011108898A3/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side

Definitions

  • the present invention relates to a base station and a mobile station.
  • the present invention relates to a method for receiving MIMO (Multi-Input Multi-Output, MIMO) feedback and a method for transmitting MIMO feedback.
  • MIMO Multi-Input Multi-Output
  • the broadband wireless access system supports hybrid automatic repeat request (HARQ) for high-speed data packet transmission, low delay, and communication reliability, and supports multiple transmit antennas and multiple receive antennas.
  • HARQ hybrid automatic repeat request
  • MIMO Multi-Input Multi-Output
  • a receiver decodes a data packet received by a physical layer to determine whether an error is detected, and if an error does not occur, transmits an acknowledgment (ACK) signal as a response signal and transmits the data packet. Inform the transmitter of the success of reception.
  • ACK acknowledgment
  • a NACK Negative Acknowledgment
  • the HARQ protocol is classified into a synchronous HARQ technique and an asynchronous HARQ technique according to transmission timing of a retransmitted packet.
  • a synchronous HARQ technique is a method in which a transmission time of a retransmission packet is constant for an initial transmission packet.
  • a scheduler of a base station determines a transmission time of a retransmission packet for an initial transmission packet.
  • the HARQ scheme is classified into an adaptive HARQ scheme and a non-adaptive HARQ scheme according to a change in the amount and location of allocated resources.
  • the adaptive HARQ scheme is an amount and location of allocated resources.
  • the non-adaptive HARQ scheme is to fix the amount and location of allocated resources.
  • High scheduling gains and high data rates can be achieved by properly mixing synchronous and asynchronous HARQ and adaptive and non-adaptive HARQ techniques and using less signaling overhead.
  • the mobile communication system may apply adaptive asynchronous HARQ for downlink (DL) data transmission and synchronous HARQ for uplink (UL) data transmission.
  • a base station In a wireless communication scheme, a base station generally schedules radio resources used for data transmission for uplink and downlink.
  • the mobile station may transmit feedback information including channel information such as various channel state information (CSI) or channel quality indicator (CQI) necessary for applying the MIMO scheme to the base station through uplink,
  • the base station may use the feedback information received from the mobile station to schedule radio resources and transmit and receive data.
  • CSI channel state information
  • CQI channel quality indicator
  • MIMO technology has recently attracted attention as a major technology of the wireless communication method that requires high-speed data transmission as a technology that can expect a significant improvement in frequency efficiency and radio link capacity by using a plurality of antennas for the base station and the mobile station.
  • MIMO technology can be divided into a spatial multiplexing (SM) technique and a spatial transmit diversity technique.
  • SM spatial multiplexing
  • the spatial multiplexing technique different data is simultaneously transmitted through multiple transmit antennas, thereby enabling high-speed data transmission without increasing the bandwidth of the system.
  • the spatial diversity scheme reliability of data may be increased by obtaining diversity by transmitting the same data simultaneously in multiple transmit antennas.
  • the MIMO technology may be classified into a closed loop (CL) MIMO method and an open loop (OL) MIMO method.
  • Closed loop MIMO is a technique that uses various channel information included in feedback information received from a mobile station when the base station transmits data to the mobile station.
  • the mobile station estimates channel information for each channel through a plurality of antennas, and transmits feedback information including the estimated various channel information to the base station.
  • the base station applies the received feedback information to the transmission data to obtain a more accurate MIMO technology effect. As a result, a reliable high speed data transmission effect can be obtained.
  • the open loop MIMO scheme transmits data without using channel information included in feedback information received from a mobile station.
  • the feedback information may not be transmitted in the open loop MIMO scheme.
  • the base station may not use the channel information included in the feedback message.
  • the open loop scheme may be applied in a channel environment for a mobile station moving at high speed
  • the closed loop scheme may be applied in a channel environment for a mobile station moving at a low speed.
  • the open loop method is applied because the channel for the mobile station moving at a high speed is severely changed and it is difficult to trust channel information included in the feedback information.
  • the channel environment for the mobile station moving at a low speed is relatively small, various channel information included in the feedback information can be trusted, and communication devices are less sensitive to delay, so that a closed loop scheme can be applied.
  • MIMO transmission modes include open loop single user MIMO, closed loop single user MIMO, and CL SU MIMO, and open loop multiple user MIMO.
  • MIMO transmission mode that additionally adopts spatial multiplexing (SM) technique and spatial transmission diversity scheme can be applied in downlink (DL) and uplink (UL), and is used in uplink (UL)
  • SM spatial multiplexing
  • UL uplink
  • UL uplink
  • MIMO transmission mode using an open loop collaborative spatial multiplexing technique to MU MIMO can be used according to the needs.
  • the mobile station transmits one or more MIMO feedbacks to transmit different channel information such as channel state information (CSI) and channel quality indicator (CQI). Modes may be supported.
  • the base station may request various mobile station information in one MIMO feedback mode or through a plurality of MIMO feedback modes according to various MIMO transmission modes. That is, when the base station requests feedback information from the mobile station, it can request only channel state information required by designating a feedback mode for different channel information or designate a plurality of feedback modes of different channel information to the MIMO system. It may also require the required channel state information.
  • the mobile station configures various channel information according to various feedback modes allocated by the base station and transmits the information to the base station.
  • the base station may request the mobile station periodically or aperiodic information of each channel, and the MIMO feedback period may be divided into short periods and long periods.
  • the mobile station may transmit the plurality of feedback information in a plurality of messages, respectively, but this may result in a waste of radio resources because the radio resources may not be used efficiently.
  • the base station decodes a data packet corresponding to the received feedback information message, and when an error is detected, the base station transmits a negative acknowledgment (NACK) signal as a response signal to inform the mobile station that the error is detected.
  • NACK negative acknowledgment
  • the mobile station retransmits the previously sent feedback information message.
  • the data reception success of the feedback information message transmitted later is earlier than the previously transmitted feedback information message, retransmission of the previously transmitted feedback message causes unnecessary problems such as waste of radio resources.
  • the use of a plurality of single feedback information is transmitted to the base station according to the feedback mode and its characteristics through fewer messages than the number of the plurality of single feedback information, thereby reducing the use of radio resources and retransmitting the feedback information message according to the HARQ processing procedure.
  • An object of the present invention is to provide a method for receiving MIMO feedback and a method for transmitting MIMO feedback, which reduces waste of radio resources.
  • a method for transmitting a MIMO feedback of a mobile station including: receiving a multi-input multi-output (MIMO) feedback mode bitmap; Estimating channel information corresponding to at least one MIMO feedback mode indicated by the MIMO feedback mode bitmap; Generating a MIMO feedback including channel information corresponding to the MIMO feedback mode bitmap and at least one MIMO feedback mode indicated by the MIMO feedback mode bitmap; And transmitting the MIMO feedback to a base station.
  • MIMO multi-input multi-output
  • the MIMO feedback mode bitmap may include one or more bits each indicating one or more MIMO feedback modes reporting wideband channel quality information, and one or more bits each indicating one or more MIMO feedback modes reporting subband channel quality information. have.
  • the MIMO feedback transmission method may further include receiving information on a feedback period, and the MIMO feedback may be transmitted when the feedback period arrives.
  • the MIMO feedback transmission method includes receiving information on an HARQ channel identifier for the MIMO feedback; And receiving information on a radio resource allocated to the HARQ channel identifier, wherein the MIMO feedback may be transmitted through a radio resource allocated to the HARQ channel identifier.
  • a method for transmitting a MIMO feedback of a base station includes: transmitting a MIMO feedback request including a multi-input multi-output (MIMO) feedback mode bitmap to a mobile station; And receiving, from the mobile station, MIMO feedback including channel information corresponding to the MIMO feedback mode bitmap and at least one MIMO feedback mode indicated by the MIMO feedback mode bitmap in response to the MIMO feedback request. do.
  • MIMO multi-input multi-output
  • the MIMO feedback mode bitmap may include one or more bits each indicating one or more MIMO feedback modes reporting wideband channel quality information, and one or more bits each indicating one or more MIMO feedback modes reporting subband channel quality information. have.
  • the MIMO feedback transmission method includes transmitting information on a HARQ channel identifier for MIMO feedback to the mobile station; And transmitting information on a radio resource allocated to the HARQ channel identifier to the mobile station, wherein the MIMO feedback request includes information on a feedback period, and the MIMO feedback upon arrival of the feedback period. It may be received through a radio resource assigned to the HARQ channel identifier.
  • a method for transmitting a MIMO feedback of a mobile station includes: receiving a MIMO feedback request including information on a multi-input multi-output (MIMO) feedback period; Estimating channel information for MIMO; Generating a signaling header comprising estimated channel information; And transmitting the signaling header to a base station either alone or with a MAC protocol data unit upon arrival of the MIMO feedback period.
  • MIMO multi-input multi-output
  • the MIMO feedback request includes a first MIMO feedback mode bitmap, and estimating the channel information includes estimating channel information corresponding to at least one MIMO feedback mode indicated by the first MIMO feedback mode bitmap. It may include.
  • the channel information may correspond to channel quality information.
  • the signaling header may further include a second MIMO feedback mode bitmap indicating the at least one MIMO feedback mode.
  • the channel information may correspond to a transmission correlation matrix.
  • a method for transmitting a MIMO feedback of a base station includes: transmitting a MIMO feedback request including information on a multi-input multi-output (MIMO) feedback period to a mobile station; And in response to the MIMO feedback request, receiving, from the mobile station, a signaling header containing channel information for MIMO, alone or in conjunction with a MAC protocol data unit, upon arrival of the MIMO feedback period.
  • MIMO multi-input multi-output
  • the MIMO feedback request includes a first MIMO feedback mode bitmap, the channel information corresponds to information corresponding to at least one MIMO feedback mode indicated by the first MIMO feedback mode bitmap, and the signaling header corresponds to the
  • the apparatus may further include a second MIMO feedback mode bitmap indicating at least one MIMO feedback mode.
  • the channel information may correspond to channel quality information.
  • the channel information may correspond to a transmission correlation matrix.
  • a method for transmitting a MIMO feedback of a mobile station includes: receiving a MIMO feedback request including a first multi-input multi-output (MIMO) feedback mode bitmap; Estimating channel information corresponding to at least one MIMO feedback mode indicated by the first MIMO feedback mode bitmap; Generating a MIMO feedback header including a second MIMO feedback mode bitmap indicating the at least one MIMO feedback mode and channel information corresponding to the at least one MIMO feedback mode; And transmitting the MIMO feedback header to a base station.
  • MIMO multi-input multi-output
  • the second MIMO feedback mode bitmap may include one or more bits each representing one or more MIMO feedback modes for reporting wideband channel quality information.
  • the second MIMO feedback mode bitmap may further include one or more bits indicating one or more MIMO feedback modes for reporting subband channel quality information.
  • the MIMO feedback request includes information on a feedback period, and the MIMO feedback header may be transmitted at the arrival of the feedback period.
  • a method for transmitting a MIMO feedback of a base station including: transmitting a MIMO feedback request including a first multi-input multi-output (MIMO) feedback mode bitmap to a mobile station; And channel information corresponding to the at least one MIMO feedback mode indicated by the first MIMO feedback mode bitmap and a second MIMO feedback mode bitmap indicating the at least one MIMO feedback mode in response to the MIMO feedback request. Receiving an MIMO feedback header from the mobile station.
  • MIMO multi-input multi-output
  • the second MIMO feedback mode bitmap may include one or more bits each representing one or more MIMO feedback modes for reporting wideband channel quality information.
  • the second MIMO feedback mode bitmap may further include one or more bits indicating one or more MIMO feedback modes for reporting subband channel quality information.
  • a method of transmitting a MIMO feedback of a base station includes: receiving a first MIMO feedback from a mobile station with a first channel identifier through a first radio resource; When the decoding of the first MIMO feedback fails, transmitting resource allocation information to the mobile station for allocating a second radio resource at a location different from a first radio resource to the first channel identifier; And re-receiving the first MIMO feedback from the mobile station via the second radio resource.
  • the method for transmitting the MIMO feedback comprises the steps of: receiving a second MIMO feedback from the mobile station with a second channel identifier over the first radio resource; And if the decoding of the second MIMO feedback succeeds prior to the first MIMO feedback, stopping the re-receipt procedure of the first MIMO feedback.
  • the second channel identifier may include corresponding to the next identifier of the first channel identifier among a plurality of channel identifiers.
  • the first MIMO feedback may be received in a first period
  • the second MIMO feedback may be received in a second period
  • the first period may be shorter than the second period
  • the first MIMO feedback may be received in a first period
  • the second MIMO feedback may be received in a second period
  • the first period may be longer than the second period
  • a method for transmitting a MIMO feedback of a mobile station comprising: transmitting a first MIMO feedback to a base station through a first radio resource with a first channel identifier; Receiving, from the base station, resource allocation information for allocating a second radio resource at a location different from a first radio resource with the negative acknowledgment for the first MIMO feedback; And retransmitting the first MIMO feedback to the base station through the second radio resource.
  • the MIMO feedback transmission method may further include transmitting a second MIMO feedback to the base station through a first radio resource with a second channel identifier; And when receiving the positive acknowledgment for the second MIMO feedback before the positive acknowledgment for the first MIMO feedback, stopping the retransmission procedure of the first MIMO feedback.
  • the method may further include determining the second channel identifier as a next identifier of the first channel identifier among a plurality of channel identifiers.
  • MIMO feedback can be effectively transmitted while reducing waste of radio resources.
  • FIG. 1 shows a method of transmitting MIMO feedback information according to an embodiment of the present invention.
  • FIG. 2 shows a retransmission method of MIMO feedback information according to an embodiment of the present invention.
  • FIG. 3 shows a retransmission method of MIMO feedback information according to an embodiment of the present invention.
  • FIG. 4 illustrates a retransmission method of MIMO feedback information according to an embodiment of the present invention.
  • FIG. 5 shows a retransmission method of MIMO feedback information according to another embodiment of the present invention.
  • FIG. 6 shows a retransmission method of MIMO feedback information according to another embodiment of the present invention.
  • FIG. 7 shows a retransmission method of MIMO feedback information according to another embodiment of the present invention.
  • FIG. 8 shows a method of transmitting MIMO feedback information according to another embodiment of the present invention.
  • FIG. 9 is a block diagram showing the structure of a base station according to an embodiment of the present invention.
  • FIG. 10 is a block diagram showing the structure of a mobile station according to an embodiment of the present invention.
  • a mobile station includes a terminal, a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS), and a user equipment. It may also refer to a user equipment (UE), an access terminal (AT), and the like, and may include all or some functions of a mobile terminal, a subscriber station, a portable subscriber station, a user device, and the like.
  • a base station is an access point (AP), a radio access station (Radio Access Station, RAS), a Node B (Node B), a base transceiver station (Base Transceiver Station, BTS), MMR ( Mobile Multihop Relay) -BS and the like, and may include all or part of functions such as an access point, a radio access station, a Node B, a base transceiver station, and an MMR-BS.
  • AP access point
  • RAS Radio Access Station
  • Node B Node B
  • BTS Base Transceiver Station
  • MMR Mobile Multihop Relay
  • FIG. 1 shows a method of transmitting MIMO feedback information according to an embodiment of the present invention.
  • the base station 100 determines an HARQ channel identifier (ACID) for MIMO feedback of the mobile station 200 (S101).
  • ACID HARQ channel identifier
  • the base station 100 determines a period for MIMO feedback of the mobile station 200 (S102).
  • the base station 100 determines the MIMO feedback mode of the mobile station 200 (S103).
  • the base station 100 allocates an uplink resource to an ACID for MIMO feedback of the mobile station 200 (S105).
  • the base station 100 transmits one or more feedback polling A-MAP messages to the mobile station 200 to identify the HARQ channel identifier (ACID) for MIMO feedback, the location and size of uplink resources allocated to the ACID, the period for MIMO feedback, and The mobile station 200 informs the MIMO feedback mode (S107).
  • Feedback polling A-MAP may be used by base station 100 to schedule MIMO feedback transmission.
  • Table 1 shows feedback polling A-MAP according to an embodiment of the present invention.
  • Polling_sub_type bit 0b0 indicates uplink resource allocation or release
  • Polling_sub_type bit 0b1 indicates feedback mode allocation type. If the Polling_sub_type bit is set to 0b0, the dedicated uplink allocation is included in the feedback polling A-MAP information element (IE). Dedicated uplink allocation may be used by mobile station 200 to send feedback in a designated feedback transmission frame defined by this information element. If the Polling_sub_type bit is set to 0b1, no dedicated uplink assignment is included. Instead, in the designated transmission frame defined by this information element, the mobile station 200 constructs feedback and the base station 100 uses an uplink basic assignment A-MAP IE or an uplink subband assignment A-MAP IE. The uplink allocation for transmission may be included, or the mobile station 200 may transmit in a feedback period specifying the same transmission frame in the dedicated uplink allocation designated by the previous feedback polling A-MPA information element.
  • IE feedback polling A-MAP information element
  • the Period field indicates the MIMO feedback transmission period in short and long periods.
  • Resources for MIMO feedback transmission are allocated in the frames specified by each short and long period.
  • the short period is p frames and the long period is q subframes.
  • the first allocation starts after two frames. In other words, when i is the index of the frame in which the feedback polling A-MAP information element was transmitted, the frame index of the first assignment for MIMO feedback transmission is given by i + 2.
  • the resource index field includes information on the location and size of uplink resources allocated to the HARQ channel identifier corresponding to the ACID field.
  • ACID represents an HARQ channel identifier. If q is 0 or p is 0, only one ACID is reserved. Otherwise, two ACIDs can be reserved.
  • the MFM_allocation_index field and the MFM_bitmap field indicate a MIMO feedback mode (MFM).
  • the MIMO feedback mode may be classified into modes 0, 1, 2, 3, 4, 5, 6, and 7 according to the type of resource unit and the MIMO transmission mode. Specifically, when MFM_allocation_index is set to 0b00, it indicates MFM 0 with measurement method indication 0, and when MFM_allocation_index is set to 0b01, it indicates MFM 3 for all subbands; when MFM_allocation_index is set to 0b10, all subbands If the MFM_allocation_index is set to 0b11, this may indicate that the MFM is defined in the feedback polling A-MAP information element whose Polling_sub-type is 0b1.
  • the MFM_bitmap field may indicate all MIMO feedback modes allocated by the base station 100 among all MIMO feedback modes supported by the wireless communication system. Table 2 shows all the MIMO feedback modes supported by the wireless communication system.
  • DLRU represents a distributed logical resource unit
  • NLRU represents a miniband logical resource unit
  • SLRU represents a subband logical resource unit.
  • MIMO feedback mode 0 is used to adopt OL SU MIMO SFBC (space-frequency block code) and OL SU MIMO SM (spatial multiplexing) in diversity permutation.
  • the mobile station 200 estimates the wideband CQI for both SFBC and spatial multiplexing and reports the CQI and space-time coding rate (STC rate).
  • STC Rate 1 means SFBC with precoding
  • STC Rate 2 means rank-2 spatial multiplexing with precoding.
  • MIMO feedback mode 0 may be used for CQI feedback for sounding based on beamforming.
  • MIMO feedback mode 1 is used for OL SU MIMO conjugate data repetition (CDR) with space time coding rate 1/2 in diversity permutation.
  • MIMO feedback mode 2 is used for OL SU MIMO SM (spatial multiplexing) in localized permutation for frequency selective scheduling.
  • the space-time coding rate (STC rate) indicates a preferred number of MIMO streams for spatial multiplexing.
  • the subband CQI corresponds to the selected rank.
  • MIMO feedback mode 3 is used for CL SU MIMO SM (spatial multiplexing) in localized permutation for frequency selective scheduling.
  • the space-time coding rate (STC rate) indicates a preferred number of MIMO streams for spatial multiplexing.
  • the subband CQI corresponds to the selected rank.
  • MIMO feedback mode 4 is used for CL SU MIMO using wideband beamforming with rank 1.
  • the mobile station 200 feeds back the wideband CQI.
  • the wideband CQI is estimated at the mobile station 200 assuming short-term or long-term precoding at the base station 100 according to the feedback period.
  • the channel state information may be obtained at the base station 100 through feedback of a correlation matrix or feedback of a wideband PMI (preferred matrix index).
  • MIMO feedback mode 5 is used for OL MU MIMO in localized permutation with frequency selective scheduling.
  • the mobile station 200 feeds back the subband selection, the MIMO stream indicator and the corresponding CQI.
  • MIMO feedback mode 6 is used for CL MU MIMO in localized permutation with frequency selective scheduling.
  • the mobile station 200 feeds back the subband selection, the corresponding CQI and the subband PMI.
  • the subband CQI corresponds to the CQI of the best PMI in the subband.
  • Rank-1 base codebook or this subset is used to estimate the PMI in one subband.
  • MIMO feedback mode 7 is used for CL MU MIMO in diversity permutation using wideband beamforming.
  • the mobile station 200 feeds back the wideband CQI.
  • the wideband CQI is estimated at the mobile station 200 assuming short or long term precoding at base station 100 according to the feedback period.
  • the channel state information may be obtained at the base station 100 through feedback of the correlation matrix or feedback of the wideband PMI.
  • the mobile station 200 measures MIMO feedback content according to the assigned MIMO feedback mode (S109).
  • the mobile station 200 transmits MIMO feedback to the base station 100 using a MAC control message, a MAC extension header or a signaling header according to the requested feedback content. It transmits (S115). In this case, the mobile station 200 allocates an ACID allocated to the MIMO feedback and transmits the MIMO feedback through an uplink resource corresponding to the assigned ACID.
  • a single base station MIMO feedback message (AAI_SingleBS_MIMO_FBK message) and a multi base station MIMO feedback message (AAI_MultiBS_MIMO_FBK message) may be used.
  • the MIMO feedback extension header may be used as the extension header.
  • a MIMO feedback report header and a correlation matrix feedback report header may be used as the signaling header.
  • a single base station MIMO feedback message, a multi base station MIMO feedback message, a MIMO feedback extension header, a MIMO feedback report header, and a correlation matrix feedback report header will be described later.
  • the mobile station 200 transmits feedback in the extension header.
  • the mobile station 200 transmits the feedback in the MAC control message.
  • Table 3 shows an extension header for feedback transmission according to an embodiment of the present invention.
  • the MIMO feedback extension header includes a type field, a MIMO feedback mode field, and channel information corresponding to the MIMO feedback mode.
  • Table 4 shows a single base station MIMO feedback message (AAI_SingleBS_MIMO_FBK message) corresponding to a MAC control message for feedback transmission according to an embodiment of the present invention.
  • a single base station MIMO feedback message may include one or more bits whose corresponding bits are set to 1 in a management message type field, a MIMO feedback mode bitmap field, and a MIMO feedback mode bitmap field. Contains channel information of the MIMO feedback mode.
  • the single base station MIMO feedback message further includes a transmission correlation matrix.
  • the size of the MIMO feedback mode bitmap is smaller than the number of supported MIMO feedback modes.
  • the single base station MIMO feedback message of Table 4 may include only channel information of a subband.
  • the number of transmit antennas of the base station 100 is 2 or 4, when no AAI_SingleBS_MIMO_FBK message is transmitted in the same packet, it is quantized with a correlation matrix feedback extended header (CMFEH), which is an extended header. The coefficients of the transmission correlation matrix are fed back. Otherwise, the coefficients of the quantized transmit correlation matrix are fed back into the AAI_SingleBS_MIMO_FBK message. If the number of antennas of the base station 100 is 8, the coefficients of the quantized transmission correlation matrix are fed back into the AAI_SingleBS_MIMO_FBK message.
  • CFEH correlation matrix feedback extended header
  • the channel information content of the two MIMO feedbacks is transmitted in one same data burst.
  • the base station 100 and the mobile station 200 start a retransmission procedure of the MIMO feedback (S117). That is, when the base station 100 successfully decodes the MIMO feedback, the base station 100 transmits an ACK message to the mobile station 200. On the other hand, if the base station fails to decode the MIMO feedback, the base station 100 transmits a NACK message to the mobile station 200. When the mobile station 200 receives the NACK message, the mobile station 200 retransmits the MIMO feedback.
  • the UL resource is allocated through the same resource allocation information message.
  • Table 5 shows an uplink basic allocation A-MAP message according to an embodiment of the present invention.
  • the uplink basic assignment A-MAP message includes a resource index field and an ACID field.
  • the Resource Index field includes information on the allocation position and size of uplink resources allocated to the HARQ channel identifier corresponding to the ACID field.
  • Retransmission may follow the following rules (1-1, 1-2, 1-3).
  • Rule 1-1 Retransmission procedure for previous HARQ bursts reporting previous MIMO feedback before new HARQ bursts reporting new MIMO feedback using the same ACID If the retransmission process does not end, the retransmission procedure for the previous HARQ burst is terminated, and the new HARQ burst takes precedence over the previous HARQ burst.
  • FIG. 2 shows a retransmission method of MIMO feedback information according to an embodiment of the present invention.
  • a feedback period corresponding to a short or long period allocated to the mobile station 200 arrives through a feedback polling A-MAP message (S203 and S205)
  • the base station 100 and the mobile station 200 before the new MIMO feedback is transmitted. It is checked whether the retransmission procedure of the previous MIMO feedback having the same ACID as the ACID for the new MIMO feedback is completed (S207 and S209).
  • the base station 100 and the mobile station 200 stop the retransmission procedure for the previous MIMO feedback having the same ACID (S211 and S213). ). That is, the base station 100 no longer requires the mobile station 200 to retransmit previous MIMO feedback via a NACK message. The mobile station 200 discards the previous MIMO feedback and does not retransmit the previous MIMO feedback even if it receives a NACK message from the base station 100.
  • the mobile station 200 transmits new MIMO feedback corresponding to the feedback period to the base station 100 (S215). At this time, the mobile station 200 uses a resource corresponding to the ACID allocated to the feedback period.
  • the base station 100 decodes the new MIMO feedback and checks whether the decoding succeeds (S217). If the base station 100 successfully decodes the new MIMO feedback, the base station 100 transmits an ACK message to the mobile station 200 (S219). On the other hand, if the base station fails to decode the new MIMO feedback, the base station 100 transmits a NACK message to the mobile station 200 (S221).
  • Rule 1-2 Short-period MIMO if the retransmission process for previous HARQ bursts reporting previously transmitted short-period MIMO feedback is not completed before a new HARQ burst for reporting new long-period MIMO feedback is transmitted
  • the retransmission procedure of the previous HARQ burst reporting the feedback information data ends, and the new HARQ burst reporting the long period MIMO feedback information data takes precedence over the previous HARQ burst.
  • FIG. 3 shows a retransmission method of MIMO feedback information according to an embodiment of the present invention.
  • the base station 100 and the mobile station 200 may change the previous short period MIMO before the new long period MIMO feedback is transmitted. Check whether the retransmission procedure of the feedback is completed (S307 and S309).
  • the base station 100 and the mobile station 200 stop the retransmission procedure for the previous short-period MIMO feedback (S311 and S313). That is, the base station 100 no longer requires the mobile station 200 to retransmit previous short-period MIMO feedback via a NACK message.
  • the mobile station 200 discards the previous short-period MIMO feedback and does not retransmit the previous short-period MIMO feedback even if it receives a NACK message from the base station 100.
  • the mobile station 200 transmits a new long period MIMO feedback corresponding to the long period q that has arrived to the base station 100 (S315). At this time, the mobile station 200 uses a resource corresponding to the ACID allocated to the long period q that has arrived.
  • the base station 100 decodes the new long-period MIMO feedback and checks whether the decoding succeeds (S317). If the base station 100 successfully decodes the new long period MIMO feedback, the base station 100 transmits an ACK message to the mobile station 200 (S319). On the other hand, if the base station fails to decode the new long period MIMO feedback, the base station 100 transmits a NACK message to the mobile station 200 (S321).
  • Rule 1-3 If the retransmission process for the previous HARQ burst reporting the long-period MIMO feedback information data transmitted before the new HARQ burst reporting the new short-period MIMO feedback information data is not completed, then the long period The retransmission procedure of the previous HARQ burst reporting the MIMO feedback information data continues, but the long period MIMO feedback information content of the retransmitted packet is discarded by the base station 100 and the new HARQ reporting the short period MIMO feedback information data. The burst takes precedence over the previous HARQ burst.
  • FIG. 4 illustrates a retransmission method of MIMO feedback information according to an embodiment of the present invention.
  • the base station 100 and the mobile station 200 may transmit the previous long period before the new short period MIMO feedback is transmitted. It is checked whether the retransmission procedure of the MIMO feedback is completed (S407 and S409).
  • the base station 100 and the mobile station 200 stop the retransmission procedure for the previous long period MIMO feedback (S411 and S413). That is, the base station 100 no longer requires the mobile station 200 to retransmit the previous long period MIMO feedback via a NACK message.
  • the mobile station 200 discards the previous long period MIMO feedback and does not retransmit the previous long period MIMO feedback even if it receives a NACK message from the base station 100.
  • the mobile station 200 transmits a new short-period MIMO feedback corresponding to the feedback period to the base station 100 (S415).
  • the mobile station 200 uses a resource corresponding to the ACID allocated to the short period p that has arrived.
  • the base station 100 decodes the new short-period MIMO feedback and checks whether the decoding succeeds (S417). If the base station 100 successfully decodes the new short-period MIMO feedback, the base station 100 transmits an ACK message to the mobile station 200 (S419). On the other hand, if the base station fails to decode the new short-period MIMO feedback, the base station 100 transmits a NACK message to the mobile station 200 (S421).
  • the MIMO Feedback Extended Header (MFEH) which is an extended header, has a fixed size of 3 bytes, the MIMO Feedback Extended Header (MFEH) may include only MIMO feedback information of only one MFM among the eight MFMs.
  • the AAI_SingleBS_MIMO_FBK message which is a MAC control message, may include only MIMO feedback information content for one or more subbands for MFMs 2, 3, 5, and 6 and a quantized transmission correlation matrix.
  • the base station 100 may request the mobile station 200 not only MIMO feedback of one MFM or transmission correlation matrix but also a plurality of MIMO feedback information through feedback polling A-MAP. Even in this case, the mobile station 200 is required to report MIMO feedback information to the base station 100 by configuring one data burst with one ACID in one frame of the period. For example, if MIMO feedback for MFM 0, 1, 4, and 7 and MIMO feedback for MFM 2, 3, 5, and 6 are required, the mobile station 200 may include one MIMO Feedback Extension Header (MIMO Feedback). Extended burst, MFEH) or a single AAI_SingleBS_MIMO_FBK message can not be configured data burst.
  • MIMO Feedback MIMO Feedback Extension Header
  • the mobile station 200 can configure the MIMO feedback using only the MFEH, since the MFEH header is required as many as the number of MIMO feedback requests, the data size increases, resulting in a waste of radio resources.
  • MFEH MIMO Feedback Extended Header
  • CMFEH Correlation Matrix Feedback Extended Header
  • the retransmission process for the previous MIMO feedback using the same ACID does not occur before the new MIMO feedback is transmitted, or the retransmission for the previous MIMO feedback and the transmission of the new HARQ burst may occur at the same location.
  • the MIMO feedback transmission corresponding to 50% may fail.
  • the mobile station 200 may require different feedback content depending on the purpose. ) Causes a problem of discarding the other MIMO feedback information.
  • a feedback information item may be transmitted in the same data burst.
  • the size of the data burst is changed by including the amount of information corresponding to the two periods, it is necessary to change the resource allocation information to be transmitted in the uplink, and through the previously signaled Feedback Polling A-MAP including HARQ channel identifier (ACID). Change of resource allocation information may be required.
  • the mobile station 200 may use channel state information of various MIMO transmission modes required for applying a MIMO scheme in a broadband wireless access system.
  • Multi-Input Multi-Output (MIMO) feedback information including CSI or channel quality indicator (CQI) may be transmitted.
  • MIMO Multi-Input Multi-Output
  • CQI channel quality indicator
  • the base station 100 provides radio channel state information required for various MIMO transmission modes.
  • a control message such as UL basic assignment A-MAP (A-MAP) or feedback polling A-MAP (Feedback Polling A-MAP) to the mobile station 200 or a short period or
  • A-MAP UL basic assignment A-MAP
  • A-MAP feedback polling A-MAP
  • a feedback allocation method for designating a long period or two periods simultaneously one or more MIMO feedbacks are allocated to the mobile station 200, and the mobile station 200 transmits the MIMO feedback through the resource allocation information. Can be.
  • a procedure of a synchronous HARQ scheme may be performed on the uplink MIMO feedback data, and the mobile station 200 identifies a HARQ channel.
  • the mobile station 200 identifies a HARQ channel.
  • ACID channel identifier
  • the base station 100 in relation to the HARQ retransmission procedure of the MIMO feedback, transmits the same ACID and UL default allocation A-MAP (UL) previously transmitted.
  • An uplink resource for retransmission HARQ packet may be allocated through an uplink MAP control message such as Basic Assignment A-MAP).
  • the mobile station 200 according to the requested feedback information, MAC control message (signaling header) or signaling header (signaling header) or extended header (extended) MIMO feedback may be transmitted to the base station 100 using a feedback message such as a header).
  • MAC control message signaling header
  • extended header extended MIMO feedback
  • the base station 100 requests MIMO feedback from the mobile station 200 in a short period or a long period, and one radio resource for transmission of the MIMO feedback.
  • the HARQ retransmission procedure of the MIMO feedback in the same period may follow the following rule 2-1.
  • Rule 2-1 More than two ACIDs, which are HARQ channel identifiers for transmitting MIMO feedback information, are used for the same period. If a previous HARQ data burst that reports previous MIMO feedback is sent to any one of two or more ACIDs, the new HARQ data burst that reports the new MIMO feedback is rotated. Is transmitted to the next ACID of any one ACID.
  • the following rules 2-1-1 to 2-1-4 shall be followed.
  • Rule 2-1-1 For retransmission of a previous HARQ data burst, the radio resource corresponding to the ACID i previously used through an uplink UL Basic Assignment A-MAP (MAP) control message An uplink radio resource at a location different from the location is allocated to ACID i.
  • MAP Basic Assignment A-MAP
  • Rule 2-1-3 The retransmission procedure for the previous HARQ data burst indicates that the base station 100 successfully decodes the new HARQ data burst so that normal transmission is completed. 200 is continued until it recognizes the HARQ ACK signal.
  • Rule 2-1-4 The retransmission procedure for the new HARQ data burst is performed by the base station 100 and the mobile station 200 before the retransmission procedure for the previous HARQ data burst. Upon recognizing completion, the retransmission procedure for the previous HARQ data burst ends.
  • FIG. 5 shows a retransmission method of MIMO feedback information according to another embodiment of the present invention.
  • the previous MIMO feedback is transmitted using ACID i
  • the new MIMO feedback is transmitted using ACID j, which is different from ACID i. j may be set to i + 1.
  • the base station 100 allocates one radio resource A to the mobile station for the initial transmission of MIMO feedback. That is, the location of the resource allocated to ACID j for the first transmission of the new MIMO feedback is the same as the location of the resource assigned to ACID i for the first transmission of the previous MIMO feedback.
  • the mobile station 200 uses the radio resource A to transmit a new MIMO feedback to a base station (ACID j) different from the ACID i of the previous MIMO feedback. 100) (S509).
  • the base station 100 decodes the new MIMO feedback and checks whether the decoding succeeds (S519).
  • the base station 100 If the base station 100 successfully decodes the new MIMO feedback, the base station 100 transmits an ACK message to the mobile station 200 (S521).
  • the base station 100 and the mobile station 200 recognize that the retransmission procedure for the new MIMO feedback is normally completed before the retransmission procedure for the previous MIMO feedback, the base station 100 and the mobile station 200 retransmit the procedure for the previous MIMO feedback. It ends (S523 and S525).
  • the base station 100 transmits a NACK message to the mobile station 200 (S527).
  • the base station 100 transmits an uplink basic allocation A-MAP message to the mobile station 200, and transmits a radio resource B at a location different from the radio resource A to the ACID j for retransmission of a new MIMO feedback.
  • Assign (S529).
  • the mobile station 200 retransmits the previous MIMO feedback to ACID i and transmits a new MIMO feedback to the base station 100 with ACID j. (S511). Since the previous MIMO feedback corresponds to a HARQ burst for retransmission, another radio resource is allocated to ACID i for previous MIMO feedback through an uplink basic allocation A-MAP message in a previous period. Thus, the location of resources allocated to ACID i for previous MIMO feedback is different from the location of resources assigned to ACID j for new MIMO feedback.
  • the base station 100 decodes the previous MIMO feedback and checks whether the decoding succeeds (S513).
  • the base station 100 If the base station 100 successfully decodes the previous MIMO feedback, the base station 100 transmits an ACK message to the mobile station 200 (S515).
  • the base station 100 transmits a NACK message to the mobile station 200 (S517).
  • the base station 100 decodes the new MIMO feedback and checks whether the decoding succeeds (S519).
  • the base station 100 If the base station 100 successfully decodes the new MIMO feedback, the base station 100 transmits an ACK message to the mobile station 200 (S521).
  • the base station 100 and the mobile station 200 recognize that the retransmission procedure for the new MIMO feedback is normally completed before the retransmission procedure for the previous MIMO feedback, the base station 100 and the mobile station 200 retransmit the procedure for the previous MIMO feedback. It ends (S523 and S525).
  • the base station 100 transmits a NACK message to the mobile station 200 (S527).
  • the base station 100 transmits an uplink basic allocation A-MAP message to the mobile station 200, and transmits a radio resource B at a location different from the radio resource A to the ACID j for retransmission of a new MIMO feedback.
  • Assign (S529).
  • the base station 100 requests MIMO feedback from the mobile station 200 in two short periods and long periods, and transmits one MIMO feedback.
  • the HARQ retransmission procedure of MIMO feedback in the same period is as follows. Rule 2-2 and Rule 2-3 can be followed.
  • Rule 2-2 prior HARQ data burst reporting previously transmitted short period MIMO feedback information data before a new HARQ data burst reporting new long period MIMO feedback information data is transmitted If the retransmission process is not completed, the new HARQ data burst reporting new long-period MIMO feedback information data and the previous HARQ data burst reporting short-period MIMO feedback information data. In order to support retransmission procedure for burst), follow the rules 2-2-1 to 2-2-3 below.
  • Rule 2-2-1 UL Basic Assignment A-MAP (MAP) control message with the same ACID used previously to retransmit previous HARQ data bursts reporting short-period MIMO feedback information data Through uplink radio resources of a location different from the previously used radio resource region is allocated.
  • MAP UL Basic Assignment A-MAP
  • Rule 2-2-2 Retransmission procedure for previous HARQ data bursts that report short-period MIMO feedback information data includes a new HARQ data burst where base station 100 reports new long-period MIMO feedback information data. The decoding of the (new HARQ data burst) succeeds until the mobile station 200 recognizes that the normal transmission is completed through a HARQ ACK signal or the like.
  • Rule 2-2-3 New HARQ data burst reporting new longer period MIMO feedback information data than retransmission procedure for previous HARQ data burst in which mobile station 200 reports short period MIMO feedback information data If it is recognized that the retransmission procedure for the (new HARQ data burst) is normally completed first, the retransmission procedure for the previous HARQ data burst for reporting the short-term MIMO feedback information data is terminated.
  • FIG. 6 shows a retransmission method of MIMO feedback information according to another embodiment of the present invention.
  • short-period MIMO feedback is transmitted using ACID i
  • long-period MIMO feedback is transmitted using ACID k, which is different from ACID i.
  • the base station 100 allocates one radio resource A to the mobile station for the initial transmission of MIMO feedback. That is, the location of the resource allocated to ACID k for the initial transmission of the long period MIMO feedback is the same as the location of the resource allocated to ACID i for the initial transmission of the short period MIMO feedback.
  • the base station 100 and the mobile station 200 transmit the same transmission before the new long period MIMO feedback is transmitted. It is checked whether the retransmission procedure of the previous short-period MIMO feedback with the time point is completed (S605 and S607).
  • the mobile station 200 transmits a new long-period MIMO feedback to the base station 100 using the radio resource A with ACID k. (S609).
  • the base station 100 decodes the new long-period MIMO feedback and checks whether the decoding succeeds (S619).
  • the base station 100 If the base station 100 successfully decodes the new long period MIMO feedback, the base station 100 transmits an ACK message to the mobile station 200 (S621).
  • the base station 100 and the mobile station 200 recognize that the retransmission procedure for the new long-term MIMO feedback is normally completed before the retransmission procedure for the previous short-period MIMO feedback, the base station 100 and the mobile station 200 transmit the previous short-period MIMO.
  • the retransmission procedure for the feedback is terminated (S623 and S625).
  • the base station 100 transmits a NACK message to the mobile station 200 (S627).
  • the base station 100 transmits an uplink basic allocation A-MAP message to the mobile station 200, so that the radio resource B at a location different from the radio resource A at the ACID k for retransmission of a new long-period MIMO feedback.
  • To allocate (S629).
  • the mobile station 200 then retransmits a new long period MIMO feedback with ACID k through the radio resource B at another location.
  • the mobile station 200 retransmits the previous short-period MIMO feedback to ACID i and transmits a new long-period MIMO feedback to ACID k. It transmits to 100 (S611). Since the previous short-period MIMO feedback corresponds to a HARQ burst for retransmission, another radio resource is allocated to the ACID i for the previous short-period MIMO feedback through an uplink basic allocation A-MAP message in the previous period. Thus, the location of resources allocated to ACID i for previous short-period MIMO feedback is different from the location of resources assigned to ACID k for new long-period MIMO feedback.
  • the base station 100 decodes the previous short-period MIMO feedback and checks whether the decoding succeeds (S613).
  • the base station 100 If the base station 100 successfully decodes the previous short-period MIMO feedback, the base station 100 transmits an ACK message to the mobile station 200 (S615).
  • the base station 100 transmits a NACK message to the mobile station 200 (S617).
  • the base station 100 decodes the new long-period MIMO feedback and checks whether the decoding succeeds (S619).
  • the base station 100 If the base station 100 successfully decodes the new long period MIMO feedback, the base station 100 transmits an ACK message to the mobile station 200 (S621).
  • the base station 100 and the mobile station 200 recognize that the retransmission procedure for the new long-term MIMO feedback is normally completed before the retransmission procedure for the previous short-period MIMO feedback, the base station 100 and the mobile station 200 transmit the previous short-period MIMO.
  • the retransmission procedure for the feedback is terminated (S623 and S625).
  • the base station 100 transmits a NACK message to the mobile station 200 (S627).
  • the base station 100 transmits an uplink basic allocation A-MAP message to the mobile station 200, so that the radio resource B at a location different from the radio resource A at the ACID k for retransmission of a new long-period MIMO feedback.
  • To allocate (S629).
  • Rule 2-3 Previous HARQ data burst reporting previously transmitted long period MIMO feedback information data before a new HARQ data burst reporting new short period MIMO feedback information data is transmitted If the retransmission process is not completed, a new HARQ data burst reporting new short-period MIMO feedback information data and a previous HARQ data burst reporting long-period MIMO feedback information data In order to support retransmission procedure for burst), rule 2-3-1 to rule 2-3-3 can be followed.
  • Rule 2-3-2 Retransmission procedure for previous HARQ data burst reporting long period MIMO feedback information data includes a new HARQ data burst where base station 100 reports new short period MIMO feedback information data. The decoding of the (new HARQ data burst) succeeds until the mobile station 200 recognizes that the normal transmission is completed through a HARQ ACK signal or the like.
  • Rule 2-3-3 New HARQ data burst reporting new short-term MIMO feedback information data than retransmission procedure for previous HARQ data burst in which mobile station 200 reports long-period MIMO feedback information data If it is recognized that the retransmission procedure for the (new HARQ data burst) is normally completed first, the retransmission procedure for the previous HARQ data burst for reporting the long-period MIMO feedback information data is terminated.
  • FIG. 7 shows a retransmission method of MIMO feedback information according to another embodiment of the present invention.
  • short-period MIMO feedback is transmitted using ACID i
  • long-period MIMO feedback is transmitted using ACID k, which is different from ACID i.
  • the base station 100 allocates one radio resource A to the mobile station for the initial transmission of MIMO feedback. That is, the location of the resource allocated to ACID k for the initial transmission of the long period MIMO feedback is the same as the location of the resource allocated to ACID i for the initial transmission of the short period MIMO feedback.
  • a feedback period corresponding to a short period allocated to the mobile station 200 arrives through a feedback polling A-MAP message (S701 and S703), the base station 100 and the mobile station 200 before the new short period MIMO feedback is transmitted. It is checked whether the retransmission procedure of the previous long period MIMO feedback having the same transmission time point is completed (S705 and S707).
  • the mobile station 200 uses the radio resource A to make a new short-period MIMO with an ACID i different from the ACID k of the previous long-period MIMO feedback.
  • the feedback is transmitted to the base station 100 (S709).
  • the base station 100 decodes the new short-period MIMO feedback and checks whether the decoding succeeds (S719).
  • the base station 100 If the base station 100 successfully decodes the new short-period MIMO feedback, the base station 100 transmits an ACK message to the mobile station 200 (S721).
  • the base station 100 and the mobile station 200 recognize that the retransmission procedure for the new short-period MIMO feedback is completed normally before the retransmission procedure for the previous long-period MIMO feedback, the base station 100 and the mobile station 200 receive the previous long-period MIMO feedback. End the retransmission procedure for (S723 and S725).
  • the base station 100 transmits a NACK message to the mobile station 200 (S727).
  • the base station 100 transmits an uplink basic allocation A-MAP message to the mobile station 200, so that the radio resource B at a location different from the radio resource A in the ACID i for retransmission of a new short-period MIMO feedback. ) Is allocated (S729).
  • the mobile station 200 retransmits a new short-period MIMO feedback with ACID i through the radio resource B at another location.
  • the mobile station 200 retransmits the previous long-period MIMO feedback with ACID k and transmits a new short-period MIMO feedback to the base station 100 with ACID i. (S711). Since the previous long period MIMO feedback corresponds to HARQ burst for retransmission, another radio resource is allocated to ACID k for previous long period MIMO feedback through an uplink basic allocation A-MAP message in the previous period. Thus, the location of resources allocated to ACID k for previous long-period MIMO feedback is different from the location of resources allocated for ACID i for new short-period MIMO feedback.
  • the base station 100 decodes the previous long period MIMO feedback and checks whether the decoding succeeds (S713).
  • the base station 100 If the base station 100 successfully decodes the previous long period MIMO feedback, the base station 100 transmits an ACK message to the mobile station 200 (S715).
  • the base station 100 transmits a NACK message to the mobile station 200 (S717).
  • the base station 100 decodes the new short-period MIMO feedback and checks whether the decoding succeeds (S719).
  • the base station 100 If the base station 100 successfully decodes the new short-period MIMO feedback, the base station 100 transmits an ACK message to the mobile station 200 (S721).
  • the base station 100 and the mobile station 200 recognize that the retransmission procedure for the new short-period MIMO feedback is completed normally before the retransmission procedure for the previous long-period MIMO feedback, the base station 100 and the mobile station 200 receive the previous long-period MIMO feedback. End the retransmission procedure for (S723 and S725).
  • the base station 100 transmits a NACK message to the mobile station 200 (S727).
  • the base station 100 transmits an uplink basic allocation A-MAP message to the mobile station 200, so that the radio resource B at a location different from the radio resource A in the ACID i for retransmission of a new short-period MIMO feedback. ) Is allocated (S729).
  • the base station 100 requests MIMO feedback from the mobile station 200 in two short periods and long periods, and transmits one MIMO feedback. Allocates a radio resource area to the mobile station 200, assigns ACID i to short-period feedback by default, assigns ACID k to long-period feedback, and provides feedback at a frame position and a long period to transmit the feedback in a short period. If the frame positions to be transmitted are the same, the MIMO feedback transmission procedure in the same period may follow the following rule 2-4.
  • Rule 2-4 If long-period MIMO feedback and short-period MIMO feedback occur at the same time, two MIMO feedback information will be transmitted through one data burst according to the rules 2-4-1 and 2-4-2 below. Can be.
  • Rule 2-4-1 If the size of the previously allocated radio resource cannot accommodate the size of one data burst composed of long-period MIMO feedback and short-period MIMO feedback, the base station 100 performs uplink UL Basic Assignment.
  • the A-MAP) control message reassigns uplink radio resources for the transmission of the MIMO feedback so that the allocated uplink radio resources can accommodate the newly configured data burst size.
  • FIG. 8 shows a method of transmitting MIMO feedback information according to another embodiment of the present invention.
  • short-period MIMO feedback is transmitted using ACID i
  • long-period MIMO feedback is transmitted using ACID k, which is different from ACID i.
  • the base station 100 allocates one radio resource A to the mobile station for the initial transmission of MIMO feedback. That is, the location of the resource allocated to ACID k for the initial transmission of the long period MIMO feedback is the same as the location of the resource allocated to ACID i for the initial transmission of the short period MIMO feedback.
  • the base station 100 transmits an uplink basic allocation A-MAP message to the mobile station 200, thereby providing a long period MIMO feedback and a short period MIMO feedback.
  • the radio resources C of different sizes that can accommodate all of them are allocated to the ACID i or the ACID j (S805).
  • the mobile station 200 At the same time as the long and short periods of time (S807 and S809), the mobile station 200 generates an HARQ burst including both the long period MIMO feedback and the short period MIMO feedback and generates an ACID i through the newly allocated radio resource C. Or transmits the HARQ burst to the base station 100 by ACID j (S811).
  • the base station 100 decodes the long-period MIMO feedback to determine whether the decoding succeeded (S813).
  • the base station 100 When the base station 100 successfully decodes the long period MIMO feedback, the base station 100 transmits an ACK message to the mobile station 200 (S815).
  • the base station 100 transmits a NACK message to the mobile station 200 (S817).
  • the base station 100 decodes the short-period MIMO feedback and checks whether the decoding succeeds (S819).
  • the base station 100 If the base station 100 successfully decodes the short-period MIMO feedback, the base station 100 transmits an ACK message to the mobile station 200 (S821).
  • the base station 100 transmits a NACK message to the mobile station 200 (S823).
  • the base station 100 divides the wireless channel state information required for various MIMO transmission modes into various types of feedback modes to provide a plurality of MIMO feedbacks ( feedback is allocated to the mobile station 200, and through the resource allocation information, the mobile station 200 may configure MIMO feedback information according to the rules 2-5 and 2-6.
  • the mobile station 200 uses a bitmap for distinguishing the MIMO feedback mode received when allocating feedback through the MAP control signal to the MIMO Feedback Extended Header (MFEH), which is an extended header.
  • MFM_bitmap is used to configure a plurality of channel information according to MIMO Feedback Mode (MFM) as shown in Table 6.
  • MFM_bitmap may correspond to a bitmap received by the mobile station through a feedback polling A-MAP message.
  • Table 6 shows a MIMO feedback extension header according to an embodiment of the present invention.
  • the MIMO feedback extension header includes a type field, a MIMO feedback mode bitmap field, and at least one MIMO in which the corresponding bit is set to 1 in the MIMO feedback mode bitmap field. Contains channel information of the feedback mode.
  • the mobile station 200 transmits MIMO feedback information through a single base station MIMO feedback message (AAI_SingleBS_MIMO_FBK message) and a multi base station MIMO feedback message (AAI_MultiBS_MIMO_FBK message) which are MAC control messages.
  • Table 7 shows the AAI_SingleBS_MIMO_FBK message.
  • a single base station MIMO feedback message may include one or more bits whose corresponding bits are set to 1 in a management message type field, a MIMO feedback mode bitmap field, and a MIMO feedback mode bitmap field. Contains channel information of the MIMO feedback mode.
  • the single base station MIMO feedback message further includes a transmission correlation matrix.
  • the size of the MIMO feedback mode bitmap is equal to the number of supported MIMO feedback modes.
  • the mobile station 200 does not have an extended header such as a MIMO Feedback Extended Header (MFEH) or a Correlation Matrix Feedback Extended Header (CMFEH) without a data payload constituting a MAC protocol data unit (PDU) in the MAC layer. It cannot be sent in stand-alone MAC PDU packets. Accordingly, according to the method for transmitting MIMO feedback information in the broadband wireless access system according to an embodiment of the present invention, the following method is used to reconfigure the MIMO feedback information into a MAC signaling header so that the MIMO feedback information is stand-alone without a data payload. It can also be transmitted to the base station 100 in the packet of.
  • MFEH MIMO Feedback Extended Header
  • CMFEH Correlation Matrix Feedback Extended Header
  • the mobile station 200 transmits the MAC information according to the MIMO Feedback Mode to a MAC Signaling Header as shown in Table 8. It is possible to transmit to the base station 100 in a stand-alone MAC PDU packet without a data payload constituting the PDU.
  • the MIMO feedback report header corresponding to the signaling header includes a flow identifier field, a type field, a MIMO feedback mode field, and channel information corresponding to the MIMO feedback mode.
  • the mobile station 200 uses a MIMO Feedback Report Header as shown in Table 9, where one MAC Signaling Header has a plurality of MIMO Feedback. It can be configured to accommodate the channel information according to the mode and the mobile station 200 can transmit the channel information to the base station 100 as a stand-alone MAC PDU packet without a data payload (payload).
  • the MIMO feedback report header of Table 9 can accommodate three MFM feedback contents for wideband information corresponding to MFM 0, 1, 4, and 7.
  • the MIMO feedback report header of Table 9 may accommodate one MFM feedback content for subband information corresponding to MFMs 2, 3, 4, and 6.
  • Table 9 shows a MIMO Feedback Report Header according to an embodiment of the present invention.
  • the MIMO feedback report header corresponding to the signaling header corresponds to a corresponding bit in a flow identifier field, a type field, a MIMO feedback mode bitmap, and a MIMO feedback mode bitmap field. Includes channel information of one or more MIMO feedback modes set to 1.
  • the transmission correlation matrix of a specific mode (e.g., MFM 3, 4, 6, or 7) among various types of feedback modes is used.
  • the mobile station 200 transmits the MIMO feedback information for the Correlation Matrix Feedback to the MAC Signaling Header as shown in Table 10 and stands alone without the data payload constituting the MAC PDU. -alone) to be transmitted to the base station 100 as a MAC PDU packet.
  • the correlation matrix feedback report header which is a signaling header according to an embodiment of the present invention, includes a flow identifier field, a type field, and a transmission correlation matrix.
  • the mobile station 200 is a standalone without data payload constituting the MAC PDU, such as the arson described in rules 2-7 to 2-9.
  • MIMO feedback information may be transmitted to the base station 100 through a MAC signaling header corresponding to a stand-alone packet.
  • the mobile station 200 connects the MIMO feedback information to the base station 100 by concatenating concatenation with other MAC PDUs in which the above-described MAC control message or extended header or data payload are combined together. You can also send.
  • FIG. 9 is a block diagram showing the structure of a base station according to an embodiment of the present invention.
  • the base station 100 includes a MIMO feedback allocation determiner 110, a feedback polling A-MAP generator 120, and a feedback polling A-MAP transmitter 130.
  • the MIMO feedback allocation determination unit 110 may include an HARQ channel identifier (ACID) for MIMO feedback of the mobile station 200, a period for MIMO feedback of the mobile station 200, a MIMO feedback mode of the mobile station 200, and an HARQ channel identifier (ACID). Determine uplink resources allocated to an HARQ channel identifier (ACID).
  • ACID HARQ channel identifier
  • the feedback polling A-MAP generation unit 120 includes a HARQ channel identifier (ACID) for MIMO feedback of the mobile station 200, a period for MIMO feedback of the mobile station 200, and a MIMO feedback mode of the mobile station 200. Generate the above feedback polling A-MAP.
  • ACID HARQ channel identifier
  • the feedback polling A-MAP transmitter 130 transmits the generated one or more feedback polling A-MAPs to the mobile station 200.
  • the uplink basic allocation A-MAP generation unit 140 generates an uplink basic allocation A-MAP including information of an uplink resource allocated to an HARQ channel identifier (ACID).
  • ACID HARQ channel identifier
  • the uplink basic assignment A-MAP transmitter 150 transmits the generated uplink basic assignment A-MAP to the mobile station 200.
  • the MIMO feedback receiver 160 receives a HARQ burst for reporting MIMO feedback from the mobile station.
  • a MIMO feedback a single base station MIMO feedback message, a multi-base station MIMO feedback message, a MIMO feedback extension header, a MIMO feedback report header, and a correlation matrix feedback report header may be received.
  • the MIMO feedback decoder 170 decodes the received HARQ burst.
  • the acknowledgment message transmitter 180 transmits an acknowledgment message on whether the decoding of the HARQ burst succeeds to the mobile station 200.
  • the acknowledgment message transmitter 180 does not transmit the NACK for the previous MIMO feedback, and terminates the retransmission procedure for the previous MIMO feedback.
  • FIG. 10 is a block diagram showing the structure of a mobile station according to an embodiment of the present invention.
  • FIG. 10 illustrates a mobile station 200 according to an embodiment of the present invention including a feedback polling A-MAP receiver 210, an uplink basic allocation A-MAP receiver 220, a channel information estimator 230, and a MIMO feedback generator ( 240, a MIMO feedback transmitter 250, and an acknowledgment message receiver 260.
  • the feedback polling A-MAP receiver 210 receives the feedback polling A-MAP from the base station 200.
  • the uplink basic assignment A-MAP receiver 220 receives the uplink basic assignment A-MAP from the base station 200.
  • the channel information estimator 230 estimates channel information corresponding to the MIMO feedback mode allocated by the feedback polling A-MAP.
  • the MIMO feedback generator 240 may generate a single base station MIMO feedback message, a multi-base station MIMO feedback message, a MIMO feedback extension header, a MIMO feedback report header, and a correlation matrix feedback report header according to the contents of the MIMO feedback. .
  • the MIMO feedback transmitter 250 transmits a HARQ burst for reporting the generated MIMO feedback to the base station 200.
  • the acknowledgment message receiver 260 receives an acknowledgment message on whether the decoding of the HARQ burst is successful from the base station 200.
  • the acknowledgment message receiver 260 instructs the MIMO feedback transmitter 250 to retransmit the MIMO feedback.
  • the acknowledgment message receiver 260 does not instruct the MIMO feedback transmitter 250 to retransmit the previous MIMO feedback, and the previous MIMO. Terminate retransmission procedure for feedback.

Abstract

Dans la présente invention, une station mobile reçoit des informations sur une mappe binaire de modes de retour à entrées et sorties multiples (MIMO) et sur une période de retour. La station mobile procède à une estimation des informations de canal qui appartiennent à au moins un des modes de retour MIMO indiqués par une mappe binaire de modes de retour MIMO. La station mobile crée une mappe binaire de modes de retour MIMO et un retour MIMO qui contient au moins l'un des modes de retour MIMO indiqués par une mappe binaire de modes de retour MIMO. La station mobile transmet une retour MIMO à une station de base lors de l'arrivée d'une période de retour.
PCT/KR2011/001531 2010-03-04 2011-03-04 Station de base, station mobile, retour à entrées et sorties multiples, procédé de réception et procédé d'émission WO2011108898A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US13/582,702 US20120327882A1 (en) 2010-03-04 2011-03-04 Base station, mobile station, mimo feedback receiving method, and mimo feedback transmitting method
JP2012556025A JP2013521694A (ja) 2010-03-04 2011-03-04 基地局、移動局、多重入力多重出力フィードバック受信方法、および多重入力多重出力フィードバック伝送方法

Applications Claiming Priority (10)

Application Number Priority Date Filing Date Title
KR10-2010-0019603 2010-03-04
KR20100019603 2010-03-04
KR10-2010-0020094 2010-03-05
KR20100020094 2010-03-05
KR10-2010-0020360 2010-03-08
KR20100020360 2010-03-08
KR20100021966 2010-03-11
KR10-2010-0021966 2010-03-11
KR10-2011-0019656 2011-03-04
KR1020110019656A KR20110100604A (ko) 2010-03-04 2011-03-04 기지국, 이동국, 다중 입력 다중 출력 피드백 수신 방법, 및 다중 입력 다중 출력 피드백 전송 방법

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US20130301560A1 (en) * 2012-05-11 2013-11-14 Qualcomm Incorporated Rank-specific feedback for improved mimo support
WO2014105787A1 (fr) * 2012-12-27 2014-07-03 Zte (Usa) Inc. Procédé et système de mesure d'ue dans la prise en charge d'essais mimo ota
US9742590B2 (en) 2010-07-07 2017-08-22 Qualcomm Incorporated Channel state information (CSI) feedback protocol for multiuser multiple input, multiple output (MU-MIMO)

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US7564831B2 (en) * 2004-12-27 2009-07-21 Lg Electronics, Inc. Method of transmitting feedback information using an extended subheader
US20090225890A1 (en) * 2005-03-04 2009-09-10 Yong Suk Jin Method of transmitting feedback information in a multi-input, multi-output (mimo) system
US20090303928A1 (en) * 2008-04-04 2009-12-10 Jin Young Chun Method for transmitting channel information in wireless communication system

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US7564831B2 (en) * 2004-12-27 2009-07-21 Lg Electronics, Inc. Method of transmitting feedback information using an extended subheader
US20090225890A1 (en) * 2005-03-04 2009-09-10 Yong Suk Jin Method of transmitting feedback information in a multi-input, multi-output (mimo) system
US20080043619A1 (en) * 2006-08-21 2008-02-21 Interdigital Technology Corporation Method and apparatus for controlling arq and harq transmissions and retransmissions in a wireless communication system
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9742590B2 (en) 2010-07-07 2017-08-22 Qualcomm Incorporated Channel state information (CSI) feedback protocol for multiuser multiple input, multiple output (MU-MIMO)
US20130301560A1 (en) * 2012-05-11 2013-11-14 Qualcomm Incorporated Rank-specific feedback for improved mimo support
US9681425B2 (en) * 2012-05-11 2017-06-13 Qualcomm Incorporated Rank-specific feedback for improved MIMO support
WO2014105787A1 (fr) * 2012-12-27 2014-07-03 Zte (Usa) Inc. Procédé et système de mesure d'ue dans la prise en charge d'essais mimo ota
JP2016510519A (ja) * 2012-12-27 2016-04-07 ゼットティーイー （ユーエスエー） インコーポレイテッド Ｍｉｍｏｏｔａをサポートするｕｅの測定のための方法およびシステム

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