WO2009088225A2 - Method for transmitting and receiving channel state information periodically or aperiodically - Google Patents
Method for transmitting and receiving channel state information periodically or aperiodically Download PDFInfo
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- WO2009088225A2 WO2009088225A2 PCT/KR2009/000084 KR2009000084W WO2009088225A2 WO 2009088225 A2 WO2009088225 A2 WO 2009088225A2 KR 2009000084 W KR2009000084 W KR 2009000084W WO 2009088225 A2 WO2009088225 A2 WO 2009088225A2
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- channel
- state information
- channel state
- base station
- csi
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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
- H04B7/0413—MIMO systems
- H04B7/0417—Feedback systems
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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
- H04B7/0621—Feedback content
- H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
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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
- H04B7/0621—Feedback content
- H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
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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
- H04B7/0636—Feedback format
- H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
Definitions
- the present invention relates to a method for enabling a terminal to periodically and/or aperiodically report channel state information to a base station, and a method for enabling the base station to receive the channel state information, wherein it is assumed that the channel state information for use in a multi-antenna system (i.e., a Multiple-Input Multiple-Output (MIMO) system) includes a channel quality indicator (CQI), a precoding matrix index (PMI), and a rank indicator (RI).
- MIMO Multiple-Input Multiple-Output
- MIMO technology a multi-antenna technology
- the MIMO technology is an abbreviation of the Multi-Input Multi-Output technology.
- the MIMO technology uses multiple transmission (Tx) antennas and multiple reception (Rx) antennas to improve the efficiency of transmission/reception (Tx/Rx) data, whereas a conventional art has generally used a single transmission (Tx) antenna and a single reception (Rx) antenna.
- the MIMO technology is not dependent on a single antenna path to receive a single entire message, and completes the entire message by collecting a plurality of data fragments received via several antennas.
- the MIMO technology can increase a data transfer rate within a specific range, or can increase a system range at a specific data transfer rate.
- FIG. 1 is a block diagram illustrating a conventional MIMO system.
- the MIMO technology can be classified into a spatial diversity scheme and a spatial multiplexing scheme.
- the spatial diversity scheme increases transmission reliability using symbols passing various channel paths.
- the spatial multiplexing scheme simultaneously transmits a plurality of data symbols via a plurality of Tx antennas, so that it increases a transfer rate of data.
- the combination of the spatial diversity scheme and the spatial multiplexing scheme has also been recently researched to properly acquire unique advantages of the two schemes.
- the spatial diversity scheme is classified into a space-time block code scheme and a space-time Trellis code scheme which simultaneously uses a diversity gain and a coding gain.
- a bit error ratio (BER) improvement performance and a code-generation degree of freedom of the space-time Trellis code scheme are superior to those of the space-time block code scheme, whereas the calculation complexity of the space-time block code scheme is superior to that of the space-time Trellis code scheme.
- a spatial diversity gain corresponds to the product or multiplication of the number of Tx antennas and the number of Rx antennas.
- this space-time coding scheme may also be considered to be a frequency-space coding scheme, and a coding scheme applied to this frequency-space coding scheme is equal to that of the space-time coding scheme.
- the spatial multiplexing scheme is adapted to transmit different data streams via individual Tx antennas.
- a receiver may unavoidably generate mutual interference between data fragments which have been simultaneously transmitted from a transmitter.
- the receiver removes this mutual interference using a proper signal processing technique, so that it can receive the resultant data having no interference.
- a maximum likelihood receiver a ZF receiver, a MMSE receiver, a D-BLAST, or a V-BLAST may be used.
- a Singular Value Decomposition (SVD) scheme may be used to remove the noise.
- the combination of the spatial diversity scheme and the spatial multiplexing scheme will hereinafter be described.
- a performance-improvement gain is gradually saturated in proportion to an increasing diversity order.
- a transmission reliability of a radio frequency (RF) channel is gradually deteriorated.
- RF radio frequency
- a general communication system performs coding of transmission information of a transmission end using a forward error correction code, and transmits the coded information, so that channel errors can be corrected by a reception end.
- the reception end demodulates a received (Rx) signal, performs decoding of forward error correction code, and recovers transmission information. By the decoding process, errors of the Rx signal caused by the channel can be corrected.
- Each of all forward error correction codes has a maximum-correctable limitation in a channel error correction.
- a reception (Rx) signal has an error exceeding the limitation of a corresponding forward error correction code
- a reception end is unable to decode the Rx signal into information having no error. Therefore, there is a need for the reception end to determine the presence or absence of an error in the decoded information. In this way, a specialized coding process for performing error detection is required, separately from the forward error correction coding process.
- a Cyclic Redundancy Check (CRC) code has been used as an error detection code.
- the CRC method is an exemplary coding method for performing the error detection instead of the error correction.
- transmission information is coded by the CRC method, and then the forward error correction code is applied to the CRC-coded information.
- a single unit coded by the CRC and the forward error correction code is generally called a codeword.
- Respective codewords are mapped to streams corresponding to ranks, and the mapped result is transmitted, where the number of streams is equal to the number of ranks corresponding to independent channels of a MIMO communication system.
- a transmission end performs precoding of Tx data, and transmits the precoded Tx data, and a reception end receives signals using a precoding vector used by the transmission end.
- the precoding vector for performing the above precoding is set to any one of precoding vectors which have been predefined as a codebook format in transmission/reception ends.
- a transmission scheme of the transmission end can be classified into an open-loop transmission method and a closed-loop transmission method according to specific information indicating whether or not the precoding vector of the transmission end requests feedback information from the reception end.
- the transmission end selects a precoding vector without using feedback information of the reception end, and transmits signals.
- the reception end indicates a specific precoding vector among predefined codebooks according to a reception end, and feeds back channel information associated with the specific precoding vector, such that the transmission end transmits signals using such a feedback signal.
- CQI channel information indicator
- MCS modulation coding scheme
- channel state information (CSI) to be notified to a base station by a terminal may include the above CQI, the precoding matrix index (PMI), and the rank indicator (RI) indicating the number of independent channels.
- This channel state information is periodically notified to a base station over a Physical Uplink Control Channel (PUCCH) and/or a Physical Uplink Shared Channel (PUSCH).
- PUCCH Physical Uplink Control Channel
- PUSCH Physical Uplink Shared Channel
- the present invention is directed to a method for transmitting and receiving channel state information periodically or aperiodically, that substantially obviates one or more problems due to limitations and disadvantages of the related art.
- an object of the present invention is to provide a method for allowing the terminal to effectively transmit channel state information aperiodically.
- an error detection capability is insufficient for current PUCCH transmission, such that a space for inserting an error detection code used to supplement the insufficient error detection capability may encounter unexpected problems.
- another object of the present invention is to provide a method for effectively solving PUCCH channel capacity problems while the terminal periodically transmits channel state information.
- a method for aperiodically transmitting channel state information (CSI) by a terminal includes: receiving an indicator requesting a channel state information report of a downlink channel from a base station over a downlink control channel; and aperiodically transmitting the channel state information (CSI) to the base station over a physical uplink shared channel (PUSCH) upon receiving the indicator from the base station.
- CSI channel state information
- the channel state information may include at least one of a precoding matrix index (PMI), a channel quality indicator (CQI), and a rank indicator (RI).
- PMI precoding matrix index
- CQI channel quality indicator
- RI rank indicator
- the physical uplink shared channel may attach a CRC to a transmission control signal in order to detect a CRC error from the transmission control signal, such that the resultant transmission control signal including the CRC may be transferred. It is assumed that the transmission control signal includes a CQI and a PMI transferred over a physical uplink shared channel (PUSCH).
- a rank indicator (RI) transferred over the physical uplink shared channel (PUSCH) may have no CRC, such that the resultant rank indicator (RI) having no CRC may be transferred.
- the method further may include periodically transmitting the channel state information (CSI) to the base station over a physical uplink control channel (PUCCH).
- CSI channel state information
- PUCCH physical uplink control channel
- the physical uplink control channel may have an error detection capability weaker than that of the physical uplink shared channel (PUSCH).
- the method may further includes, upon receiving the indicator requesting the channel state information report at a specific subframe, transmitting the channel state information (CSI) over the physical suplink shared channel (PUSCH) after a lapse of 4 subframes from the specific subframe.
- CSI channel state information
- PUSCH physical suplink shared channel
- the channel state information may include a wideband precoding matrix index and a subband precoding matrix index, in which if the subband precoding matrix index is transferred, a precoding matrix index for each subband is cyclically transmitted in an entire system band or is transferred from an upper layer higher than a physical layer according to a predetermined order.
- a method for periodically transmitting channel state information (CSI) by a terminal including: transmitting channel quality information including both a channel quality indicator (CQI) and a precoding matrix index (PMI) to a base station; and transmitting a rank indicator (RI) to the base station, in which the channel quality information and the rank indicator (RI) are transferred over a physical uplink control channel (PUCCH) at different times.
- CSI channel state information
- CQI channel quality indicator
- PMI precoding matrix index
- RI rank indicator
- the channel quality information may include wideband channel quality information and subband channel quality information, in which the wideband channel quality information and the subband channel quality information are transferred over the physical uplink control channel (PUCCH) at different times.
- PUCCH physical uplink control channel
- the rank indicator (RI) may have a transmission period, which is different from a transmission period of the channel quality information.
- the transmission period of the rank indicator (RI) may be longer than the transmission period of the channel quality information.
- the subband channel quality information may be transferred at a specific time between transmission times of two successive wideband channel quality information parts.
- a method for allowing a base station to aperiodically receive channel state information (CSI) from a terminal including: transmitting an indicator requesting a channel state information report of a downlink channel over a downlink control channel; and aperiodically receiving a report of the channel state information (CSI) from the terminal over a physical uplink shared channel (PUSCH).
- CSI channel state information
- the channel state information may include at least one of a precoding matrix index (PMI), a channel quality indicator (CQI), and a rank indicator (RI), and the physical uplink shared channel (PUSCH) attaches a CRC to a transmission signal in order to detect a CRC error from the transmission signal, such that the resultant transmission control signal including the CRC is transferred.
- PMI precoding matrix index
- CQI channel quality indicator
- RI rank indicator
- PUSCH physical uplink shared channel
- the method further includes periodically receiving the channel state information (CSI) from the terminal over a physical uplink control channel (PUCCH).
- CSI channel state information
- PUCCH physical uplink control channel
- the present invention may provide a method for allowing a terminal to aperiodically transmit channel state information to a base station upon receiving a request from the base station.
- the base station prescribes an indicator for transmitting aperiodic channel state information to the terminal in a downlink control channel, such that aperiodic channel state information can be effectively transmitted. Transmission over a PUSCH is prescribed, such that the error detection capability of the base station can be guaranteed.
- the present invention transmits various channel state information transmitted over a PUCCH, for example, a wideband PMI/CQI, a subband PMI/CQI, and an RI at different times, resulting in a guarantee of PUCCH capacity.
- FIG. 1 is a block diagram illustrating a conventional MIMO system
- FIGS. 2 and 3 illustrate methods for allowing a terminal to periodically transmitt channel state information to a base station
- FIG. 4 is a conceptual diagram illustrating a method for allowing a terminal to aperiodically transmit channel state information over a PUSCH according to the present invention.
- FIG. 5 is a conceptual diagram illustrating a method for periodically transmitting a wideband CQI/PMI, a subband CQI/PMI, and an RI over a PUCCH according to the present invention.
- a terminal may include a user equipment (UE), a mobile terminal (Mobile Terminal), and a mobile station (MS), and may also be called any one of them as necessary.
- the base station may include a Node-B and an eNode-B, and may also be called either of them.
- channel state information including a CQI, a PMI and an RI may be periodically transferred from the terminal to the base station over the PUCCH.
- FIGS. 2 and 3 illustrate methods for allowing a terminal to periodically transmitt channel state information to a base station.
- a user equipment transmits a CQI, a PMI and an RI over a PUCCH and/or a PUSCH at intervals of a predetermined period, such that the UE need not receive a special grant signal for transmitting channel state information from the base station.
- the user equipment (UE) feeds back channel state information (CQI, PMI, and RI) over a PUCCH or PUSCH at intervals of a specific period (e.g., A frame under PUCCH transmission or a B frame under PUSCH transmission) constructed by an upper layer (e.g., an RRC layer).
- the PUCCH signal is transmitted under the condition that there is no additional error detection code such as a CRC.
- channel state information is transferred over a PUSCH due to the limitation of PUCCH capacity.
- this channel state information includes an error detection code such as a CRC, such that the resultant channel state information is transmitted over the PUSCH.
- a base station to report channel state information to a user equipment (UE) at a specific time, separately from another procedure for allowing the base station to periodically report the channel state information.
- a channel state information transmission event i.e., eNB triggered CSI reporting event
- the base station to inform the user equipment (UE) of the eNB triggered CSI reporting event over a downlink control channel by an indicator. Therefore, scheduling information for an uplink channel can be carried out, and it is more preferable for an uplink grant (UL Grant) signal for a PUSCH to be carried out as described above.
- UL Grant uplink grant
- an uplink channel information transmission request such as a CQI report request may be transferred to the user equipment (UE) by a signaling process of one bit.
- UE user equipment
- N uplink acknowledgement
- an error detection capability of the PUCCH may be less than that of the PUSCH as described above. Therefore, channel state information aperiodically reported by the user equipment (UE) may be transferred over the PUSCH capable of detecting CRC errors. As a result, the base station is able to detect Rx errors of the CQI, PMI, and RI, and is able to aperiodically acquire channel state information.
- Channel state information transferred by the user equipment may be either wideband channel state information of all system bands or subband channel state information of an arbitrary frequency band contained in an overall system band.
- each subband PMI may be cyclically transferred in an overall system band, or may also be transferred over an upper layer according to a predetermined order.
- FIG. 4 is a conceptual diagram illustrating a method for allowing the user equipment (UE) to aperiodically transmit channel state information over a PUSCH according to the present invention.
- the user equipment is able to receive an indicator (indicator of 1 bit or N bits) requesting aperiodic transmission of channel state information from a base station over a downlink control channel at step S401.
- the indicator received at the step S401 may be used as an UL Grant signal.
- this indicator may hereinafter be referred to as a CQI Request having a length of 1 bit.
- the CQI Request may have more bits to indicate whether subband channel state information is requested, as well as to inform the UE of additional information such as a subband position.
- the user equipment (UE) having received the CQI Request signal as described above answers the CQI Request signal after the lapse of a predetermined time, such that it is able to transfer aperiodic channel state information such as CQI/PMI/RI over a PUSCH at step S402.
- the UE receives the CQI Request at the N-th subframe, it is able to transmit CQI/PMI/RI over the PUSCH to answer the CQI Request at the (n+4)-th subframe.
- the PUSCH may further include a CRC for detecting errors of a Tx signal, such that the resultant PUSCH may be transferred.
- the base station having received aperiodic channel state information determines the presence or absence of errors in channel state information received from the user equipment (UE), such that the determined result may be notified as confirmation information to the user equipment (UE).
- the CRC may be attached to channel state information of some categories according to a control information multiplexing scheme, an amount of information, and a requested reliability, such that the CRC-attached channel state information may be transferred.
- confirmation information indicating that the latest PMI reported from the UE to the base station has been used by the base station, may be referred to as PMI confirmation information.
- a wideband PMI decided as either a designated frequency area or a total system band, and a rank information feedback.
- this specific code may be a parity check code (e.g., even/odd parity, Hamming code).
- an error detection capability based on a syndrome check of an algebraic code based coding of the PUCCH can be assigned.
- the error detection capability based on the aforementioned algebraic code based coding may be damaged by length adaptation for a code sequence. Therefore, additional error detection codes may be inserted into the PUCCH, such that it is preferable that the error detection capability is strengthened.
- the number of bits of control information (CQI, PMI, and/or RI) fed back over an arbitrary PUCCH in an arbitrary feedback event is higher than a maximum number of transmittable information bits which satisfy a QoS requested by the PUCCH (i.e., if any redundant bit capable of satisfying a QoS requested on the PUCCH does not exist), the insertion of additional error detection codes or the strengthening of arbitrary error detection capability may have unexpected difficulty.
- control information be fed back with a prescribed margin to prepare for the maximum number of control information bits which satisfy a QoS in all PUCCH transmissions simultaneously while being fed back.
- one embodiment of the present invention provides a method for transferring CQI/PMI information and RI information at different times. Also, if the wideband CQI/PMI and the subband CQI/PMI are simultaneously transmitted, it is preferable that the wideband CQI/PMI and the subband CQI/PMI be transmitted at different times. Transmitting the wideband CQI/PMI, the subband CQI/PMI, and the RI at different times may be designated to have periods of different lengths in view of individual information which is periodically transmitted over the PUCCH, or the above transmitting may have the same period whereas it has different transmission times, in such a way that the aforementioned transmitting may be implemented.
- FIG. 5 is a conceptual diagram illustrating a method for periodically transmitting a wideband CQI/PMI, a subband CQI/PMI, and an RI over a PUCCH according to the present invention.
- the wideband CQI/PMI and the RI must be transferred at different times according to this embodiment of the present invention.
- the wideband CQI/PMI and the subband CQI/PMI are transferred via different subframes contained in the PUCCH.
- the RI is transmitted with a period longer than a period corresponding to the subframe of 3n. If the RI also needs to be transmitted at a transmission time of the wideband CQI/PMI, it is assumed that the RI having a longer period is transmitted.
- the wideband CQI/PMI, the subband CQI/PMI, and the RI are simultaneously transmitted.
- the subband CQI/PMI is transmitted at a specific time between two successive wideband CQI/PMI transmission times, and it is assumed that each transmission is periodically carried out.
- the CQI/PMI and RI, the wideband CQI/PMI, and the subband CQI/PMI and RI are transmitted via different subframes of the PUCCH, such that a capacity space capable of increasing the error detection throughput can be easily detected from the PUCCH.
- this embodiment may configure a coding process using a specific pattern for enhancing the error detection capability in case of a permutation for a length matching or a puncturing process.
- an additional coding for each information may be carried out and this coded result may be then joint-coded, resulting in the implementation of a total coding process.
- the present invention is not limited to only the above-mentioned embodiments, but can be applied to other examples which can satisfy the above principles and new characteristics of the present invention.
- the present invention can be applied to a variety of wireless communication systems.
- the above-mentioned embodiments can be readily applied to a 3GPP LTE system and a 3GPP LTE-A system acting as a new version of the 3GPP LTE system, and the scope or spirit of the present invention is not limited to only the 3GPP LTE system and the 3GPP LTE-A system but can also be applied to a variety of wireless communication systems which allow the user equipment (UE) to periodically or aperiodically transmit channel state information to the base station.
- UE user equipment
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Abstract
Description
Claims (15)
- A method for aperiodically transmitting channel state information (CSI) by a terminal, the method comprising:receiving an indicator requesting a channel state information report of a downlink channel from a base station over a downlink control channel; andaperiodically transmitting the channel state information (CSI) to the base station over a physical uplink shared channel (PUSCH) upon receiving the indicator from the base station.
- The method according to claim 1, wherein the channel state information (CSI) includes at least one of a precoding matrix index (PMI), a channel quality indicator (CQI), and a rank indicator (RI).
- The method according to claim 1, wherein the physical uplink shared channel (PUSCH) attaches a CRC to a transmission control signal in order to detect a CRC error from the transmission control signal, such that the resultant transmission control signal including the CRC is transferred.
- The method according to claim 1, further comprising:periodically transmitting the channel state information (CSI) to the base station over a physical uplink control channel (PUCCH).
- The method according to claim 4, wherein the physical uplink control channel (PUCCH) has an error detection capability weaker than that of the physical uplink shared channel (PUSCH).
- The method according to claim 1, further comprising:upon receiving the indicator requesting the channel state information report at a specific subframe, transmitting the channel state information (CSI) over the physical suplink shared channel (PUSCH) after a lapse of 4 subframes from the specific subframe.
- The method according to claim 1, wherein the channel state information includes a wideband precoding matrix index and a subband precoding matrix index, in whichif the subband precoding matrix index is transferred, a precoding matrix index for each subband is cyclically transmitted in an entire system band or is transferred from an upper layer higher than a physical layer according to a predetermined order.
- A method for periodically transmitting channel state information (CSI) by a terminal, the method comprising:transmitting channel quality information including both a channel quality indicator (CQI) and a precoding matrix index (PMI) to a base station; andtransmitting a rank indicator (RI) to the base station, in whichthe channel quality information and the rank indicator (RI) are transferred over a physical uplink control channel (PUCCH) at different times.
- The method according to claim 8, wherein the channel quality information includes wideband channel quality information and subband channel quality information, in whichthe wideband channel quality information and the subband channel quality information are transferred over the physical uplink control channel (PUCCH) at different times.
- The method according to claim 8, wherein the rank indicator (RI) has a transmission period, which is different from a transmission period of the channel quality information.
- The method according to claim 10, wherein the transmission period of the rank indicator (RI) is longer than the transmission period of the channel quality information.
- The method according to claim 9, wherein the subband channel quality information is transferred at a specific time between transmission times of two successive wideband channel quality information parts.
- A method for allowing a base station to aperiodically receive channel state information (CSI) from a terminal, the method comprising:transmitting an indicator requesting a channel state information report of a downlink channel over a downlink control channel; andaperiodically receiving a report of the channel state information (CSI) from the terminal over a physical uplink shared channel (PUSCH).
- The method according to claim 13, wherein:the channel state information includes at least one of a precoding matrix index (PMI), a channel quality indicator (CQI), and a rank indicator (RI), andthe physical uplink shared channel (PUSCH) attaches a CRC to a transmission signal in order to detect a CRC error from the transmission signal, such that the resultant transmission control signal including the CRC is transferred.
- The method according to claim 13, further comprising:periodically receiving the channel state information (CSI) from the terminal over a physical uplink control channel (PUCCH).
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09701460.9A EP2215744B1 (en) | 2008-01-08 | 2009-01-08 | Method for transmitting and receiving channel state information periodically or aperiodically |
CN200980101859.9A CN101911523B (en) | 2008-01-08 | 2009-01-08 | Method for transmitting and receiving channel state information periodically or aperiodically |
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Also Published As
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KR101476202B1 (en) | 2014-12-24 |
EP2215744A4 (en) | 2015-05-13 |
CN101911523A (en) | 2010-12-08 |
US20090190528A1 (en) | 2009-07-30 |
JP2011509018A (en) | 2011-03-17 |
EP2215744B1 (en) | 2017-10-18 |
JP5174923B2 (en) | 2013-04-03 |
WO2009088225A3 (en) | 2009-10-29 |
EP2215744A2 (en) | 2010-08-11 |
US8358585B2 (en) | 2013-01-22 |
KR20090076784A (en) | 2009-07-13 |
CN101911523B (en) | 2014-04-02 |
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