WO2009033358A1 - Procédé de rétroaction d'information, système, dispositif utilisateur et station de base basée sur le domaine spatial, fréquentiel et temporel - Google Patents
Procédé de rétroaction d'information, système, dispositif utilisateur et station de base basée sur le domaine spatial, fréquentiel et temporel Download PDFInfo
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- WO2009033358A1 WO2009033358A1 PCT/CN2008/001525 CN2008001525W WO2009033358A1 WO 2009033358 A1 WO2009033358 A1 WO 2009033358A1 CN 2008001525 W CN2008001525 W CN 2008001525W WO 2009033358 A1 WO2009033358 A1 WO 2009033358A1
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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
- H04B7/0621—Feedback content
- H04B7/0634—Antenna weights or vector/matrix coefficients
-
- 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 invention relates to an information feedback method and system for wireless communication, in particular to an information feedback method and system based on space-time frequency domain three-dimensional space in a downlink multiple input multiple output (MIM0) system, a user equipment and a base station, for wireless The field of transmission technology.
- MIM0 downlink multiple input multiple output
- wireless services have developed extremely rapidly, and the number of users has increased exponentially.
- the main challenge for wireless services is still whether wireless services can provide high-speed and high-performance services.
- OFDM orthogonal frequency division
- MIM0 Multiple Input Multiple Output Antenna
- the IMT2000 standardization in the 3rd Generation Partnership Project (3GPP) is considered to adopt MIM0 technology because MIM0 can achieve high data throughput.
- the base station In the third generation mobile communication technology, the base station (BS) has changed the transmission data rate of the base station transmitter by adaptive code modulation technology by using channel state information (CSI) fed back by the user equipment (UE).
- CSI channel state information
- the base station uses the feedback information of the user equipment to optimize the transmitter to improve spectrum utilization. Rate ideas and methods are still very popular, so many companies have proposed a precoding-based MIM0 transmission method, the closed-loop method, which allows channel feedback information to improve system performance.
- the codebook-based information feedback method establishes a relationship between the air feedback overhead and the closed-loop MIM0 performance. Eclectic and balanced.
- Superior information feedback methods can reduce the overhead of feedback information and damage the closed-loop MIM0 system without damage or minimal damage.
- Performance while the channel has some special performance reduction information feedback in the airspace, frequency domain, and time domain three-dimensional space.
- frequency domain, time domain characteristics of three-dimensional space and take some effective or adaptive feedback method To gain gains in feedback and system performance.
- the object of the present invention is to overcome the deficiencies in the prior art, and provide an information feedback method and system based on space-time frequency domain three-dimensional space in a downlink MIM0 system, so as to fully utilize the selection characteristics of a channel in a space-time frequency domain three-dimensional space.
- the amount of feedback information is reduced on the basis of ensuring the quality of the wireless cell service, and is easy to implement.
- the present invention is implemented by the following technical solutions:
- the present invention first sets different MIM0 modes for different users according to the motion speed and path loss of different user equipments, so as to reduce the feedback information of the rank of the MIM0 system;
- the space selection feature is designed and uses a highly efficient and simple feedback method of precoding matrix index number (PMI) to reduce the overhead feedback overhead of the precoding matrix index number.
- PMI precoding matrix index number
- an efficient and simple frequency domain is designed and used.
- CQI feedback method thereby reducing the feedback information of CQI in the frequency domain; and then designing and using an efficient and simple time domain CQI feedback method according to the time selection characteristics of the channel, thereby The feedback information of the CQI in the time domain is reduced.
- the base station optimizes the transmitter according to the feedback information of the uplink, thereby improving the quality of service of the wireless cell.
- the base station measures the path loss of different user equipments in the cell, and divides the user equipment into a central user and an edge user according to the measurement result, and then allocates different frequency bands to different wireless cells for the adjacent multiple wireless cells. Central users and edge users to reduce interference from neighboring wireless cells.
- the central user and the edge user report their respective motion speeds to the base station.
- the base station determines the open-loop and closed-loop modes according to the motion speed of the central user and the edge user.
- the central user or the edge user with high motion speed adopts the open-loop MIM0 mode, and the motion
- the low-speed center user or edge user adopts the closed-loop MIM0 mode.
- the base station further determines its MIM0 mode according to the path loss of the central user or the edge user, including single-user MIM0, multi-user MIM0, beamforming, and the like.
- the central user or edge user determines the respective information feedback mode according to the spatial selection characteristics of the channel. If the channel is a spatially selective channel, each resource block of the central user or edge user is spatially non-coherent at various angles of the space, so each resource block of the central user is at a feedback angle (ie, a precoding matrix index) No.)
- the information feedback method using the best precoding matrix index number that is, the angle at which the CQI performance is best (ie, the precoding matrix index number), and each resource block of the edge user adopts an adaptive information feedback method in the feedback angle.
- the first resource block feeds back the change of the first PMI compared with the above reference value
- the second resource block feeds back the second PMI and The amount of change _ compared to the above reference value, if the PMI of the resource block does not change or change very little (less than the predetermined threshold), the feedback is not applied, and the same feedback method applies to all resource blocks, then the feedback of the PMI The amount of information is greatly reduced. If the channel is a non-spatial selective channel, each resource block of the central user or edge user is spatially coherent at various angles of space.
- each resource block of the central user adopts an improved optimal PMI information feedback method in the feedback angle (ie, PMI), that is, an information feedback method of the best PMI of the packet resource block; each resource block of the edge user is in feedback
- the angle (ie PMI) adopts an adaptive information feedback method, that is, a resource block adjacent to a spatial position constitutes a resource block group, and then, the initial time is fed back to the reference value of the PMI of all resource block groups, and then, the first The resource block group feeds back the amount of change of the first PMI compared with the reference value, and the second resource block group feeds back the change of the second PMI compared with the reference value. If the next time, the PMI of the resource block group does not exist.
- the change or change is small (less than the predetermined threshold)
- no feedback is applied.
- the same feedback method applies to all resource block groups, and the amount of feedback information of the PMI is greatly reduced.
- predetermined threshold The value can be determined by the user based on the actual PMI level, or can be obtained by calculation based on the actual PMI level.
- the reference value of the PMI for all resource blocks or resource block groups at that time can be fed back again for a predetermined period of time to correct the long time. Error accumulation effect.
- the central user or edge user determines the respective information feedback mode according to the frequency selection characteristics of the channel. If the channel is a frequency selective channel, then each resource block of the central user or edge user is frequency incoherent throughout the different frequency bands: therefore, each resource block of the central user is optimally used in feedback CQI
- the CQI information feedback method that is, the CQI of the resource block with the best performance of the CQI is fed back.
- Each resource block of the edge user adopts an adaptive information feedback method when feeding back the CQI, that is, first, the initial time is fed back to the CQI of all the resource blocks.
- the first resource block feeds back the amount of change of the first CQI compared with the reference value, and the two resource blocks feed back the change of the second CQI compared with the reference value, if the next time, If the CQI of the resource block does not change or changes little (less than a predetermined threshold), then no feedback is applied.
- the same feedback method applies to all resource blocks, and the amount of feedback information of the CQI is greatly reduced. If the channel is a non-frequency selective channel, each resource block of the central user or edge user is frequency incoherent on different frequency bands.
- each resource block of the central user adopts an improved information feedback method of the best channel quality indicator when feeding back the CQI, that is, an information feedback method of the best CQI of the packet resource block; each resource block of the edge user is feedback CQI
- An adaptive information feedback method is adopted, that is, a plurality of resource blocks adjacent to a frequency band position form a resource block group, and then, a reference value of a CQI for all resource block groups is fed back at an initial time, and then, the first resource block group feeds back the first The amount of change of the CQI compared with the above reference value, the second resource block group feeds back the change of the second CQI and the reference value, and if the next moment, the CQI of the resource block group does not change or changes little.
- the above predetermined threshold value may be determined by the user according to the actual CQI level, or may be obtained by calculation based on the actual CQI level.
- the reference value of the CQI for all resource blocks or resource block groups at that time can be fed back again for a predetermined period of time to correct the long time. Error accumulation effect.
- the central user or edge user determines the respective information feedback mode according to the time selection characteristics of the channel. If the channel is a time-selective channel, each resource block of the central user or edge user is non-coherent in time; if the channel is a non-time selective channel, then each resource block of the central user or edge user is in time It is related. For time-selective channels, the central user can use the best CQI feedback method on each transmit slot interval (TTI), and edge users can use adaptive feedback on each TTI.
- TTI transmit slot interval
- the method that is, first, in the initial TTI, the reference value of the CQI for all resource blocks is fed back, and then, in the first frame, the first resource block feeds back the amount of change of the first CQI compared with the above reference value, second The resource blocks feed back the change of the second CQI compared with the above reference value; in the next TTI, if the CQI of the resource block does not change or the change is small (less than a predetermined threshold), no feedback is given, and the same feedback method is applied.
- the amount of feedback information for CQI is greatly reduced; for non-time-selective channels, the central user can use the improved best CQI feedback method on each TTI, and the edge users can also An adaptive feedback method is adopted on the TTI, that is, a resource block group adjacent to a frequency band position constitutes a resource block group, and then, in the initial TTI, a reference value of CQI for all resource block groups is fed back, and then, in the first TTI, The first resource block group feeds back the amount of change of the first CQI compared with the above reference value, and the second resource block group feeds back the amount of change of the second CQI compared with the above reference value; I.
- an adaptive information feedback method can be adopted in the time domain for both the time selective channel and the non-time selective channel. This adaptive information feedback method can be used for the selective channel. Based on the resource block-based CQI adaptive feedback method, a resource block group-based CQI adaptive feedback method can be adopted for the non-selective channel.
- the predetermined threshold value may be determined by the user according to the actual CQI level, or may be obtained by calculation according to the actual CQI level.
- the reference value of the CQI for all resource blocks or resource block groups at the time of the ⁇ can be fed back again for a predetermined period of time to correct the long time. The cumulative effect of the error.
- the base station reports the feedback information of the space-time-frequency three-dimensional space reported by the center user and the edge user to optimize the transmitter.
- the base station calculates the overall throughput and edge throughput of the wireless cell, measures and evaluates the quality of service of the wireless cell, and reports it to the upper layer information management system.
- the invention provides an information feedback method and system based on space-time frequency domain three-dimensional space in a downlink MIM0 system, and sets the MIM0 mode of the user equipment according to the motion speed and path loss of the user equipment, and utilizes the spatial selection characteristics of the channel respectively. , frequency selection characteristics, time selection characteristics to design an efficient and simple information feedback method, to reduce the overhead of feedback information, but also improve the spectrum utilization of the uplink and the quality of service of the wireless cell. Therefore, the information feedback method and system based on space-time frequency domain three-dimensional space in the downlink MIM0 system are effective, simple, convenient, and flexible, and are applicable to the third generation (3G), the super third generation (S3G), and the fourth.
- Generation (4G) cellular mobile communication and digital television (DTV), wireless local area network (WLAN), wireless A closed-loop MIMO transmission scheme for systems such as wide area networks (WWANs).
- FIG. 1 is a schematic diagram of a M 0 mode of a user equipment in a wireless cell
- Figure 2 is a schematic diagram of the information feedback method
- Figure 3 is a composition diagram of feedback information
- 4a to 4d are flowcharts of an information feedback method based on a space-time frequency domain three-dimensional space
- Figure 5 is a schematic diagram of FDM resource scheduling
- Figure 6 is a schematic diagram of a spatially selective channel
- Figure 7 is a schematic diagram of a spatial non-selective channel
- Figure 8 is a schematic diagram of selecting a precoding matrix index number
- FIG. 9 is a schematic diagram of a precoding matrix index number feedback of a spatially selective channel
- FIG. 10 is a resource block (RB)-based adaptive precoding matrix index number feedback principle diagram
- FIG. 11 is a schematic diagram of a precoding matrix index number feedback of a non-spatial selective channel
- FIG. 12 is a configuration diagram of precoding matrix index number feedback information of a non-spatial selective channel
- Figure 13 is a schematic diagram of the feedback mode of the time dimension
- Figure 14a is a schematic diagram of a frequency selective channel
- Figure 14b is a schematic diagram of a non-frequency selective channel
- 15 is a schematic diagram of a time-frequency dimensional feedback mode of a frequency selective channel environment
- Figure 16 is a schematic diagram of the feedback mode of the time dimension
- 17 is a schematic diagram of a time-frequency dimensional feedback mode of a non-frequency selective channel environment
- FIG. 18 is a schematic diagram of a first example of a codeword-based spatial mapping relationship in a MIM0 system
- FIG. 19 is a schematic diagram of a second example of a codeword-based spatial mapping relationship in a MIM0 system
- FIG. 20 is a codeword based method in a MIM0 system.
- FIG. 21 is a schematic diagram of a fourth example of a codeword-based spatial mapping relationship in a MIM0 system
- FIG. 22 is a schematic diagram of a fifth example of a codeword-based spatial mapping relationship in a MIM0 system
- 23 is a schematic diagram of a sixth example of a codeword-based spatial mapping relationship in a MIM0 system
- FIG. 24 is a schematic diagram of a seventh example of a codeword-based spatial mapping relationship in a MIM0 system;
- FIG. 26 is a schematic diagram of an eighth example of a codeword-based spatial mapping relationship in a MIMO system
- FIG. 26 is an overall block diagram of an information feedback system based on a space-time frequency domain three-dimensional space
- FIG. 27 is a space-time-frequency based on the present invention. Functional block diagram of a domain three-dimensional information feedback system. detailed description
- the structure of the radio cell is as shown in FIG. 1.
- the present invention uses one base station (BS) and multiple user equipments (UEs) in one radio cell, and the BS divides the UE into a central user and an edge according to path loss of different UEs.
- the user where each UE in the dashed box is the center user, and each UE outside the dotted frame is the edge user.
- the downlink of the wireless cell adopts a pre-coded closed-loop MIM0 system.
- multiple central UEs and edge UEs in the downlink MIM0 system may adopt different MIM0 modes.
- the original transmission signal of the transmitter is subjected to channel coding 2011 ⁇ 201n, then modulated 2021 ⁇ 202n, code-to-layer mapping 203 ⁇ 203n, the mapped symbols are pre-coded 204 ⁇ 204n, and then OFDM mapping 2051 ⁇ 205n is performed.
- the OFDM signal is generated 2061 ⁇ 206n; the receiver performs fast Fourier transform (FFT) 3011 ⁇ 301n on the received signal, and then sends the MIM0 receiver 302 ⁇ 302 ⁇ , and then performs demodulation 3031 ⁇ 303n and channel decoding 3041 ⁇ 304n ;
- the MIMO receiver feeds back feedback information such as CQI, rank, precoding matrix precoding matrix index number back to the channel coding of the transmitter 2011 ⁇ 201n, modulation 2021 ⁇ 202n, codeword to layer mapping 203 ⁇ 203n, precoding 204 ⁇ 204 ⁇ And other modules.
- the MIM0 mode includes a closed-loop MIM0 mode and an open-loop MIM0 mode.
- the closed-loop MIM0 mode includes single-user MIMO (SU-MIM0), multi-user MIMO (U-MIMO), beamforming users (Beamforming:), and multiple users. MIMO combined beamforming users (MU-MIMO+Beamforming), etc.
- the open-loop MIM0 mode includes an Open-Loop TD (Open-Loop TD).
- the UE adopting the closed-loop MIMO mode needs to feed back the feedback information of the channel to the BS through the uplink, and the BS performs operations such as precoding, resource scheduling, and transmitter optimization according to the feedback information reported by the UE, and the feedback information includes the rank of the MIM0 ( Rank), the index of the precoded codebook The number (ie, Precoding Matrix Index), Channel Quality Indicator (CQI), and the composition of the feedback information are as shown in FIG. 3, wherein the rank may include 2 bits of information, and the CQI includes 5 bits of information.
- the BS may measure the path loss of all UEs according to the environment in which the UE is located in the radio cell (S401), and classify all UEs according to the measured result (S402), as shown in FIG. 4a, 4b. , 4c, 4d.
- the BS sets a threshold for the path loss.
- the UE below the threshold is the central UE, and the UE above the threshold is the edge UE.
- the BS determines the MIM0 mode of the UE according to the motion speed.
- the BS notifies the high-speed UE to adopt the open-loop MIM0 mode, and notifies the low-speed UE to adopt the closed-loop MIM0 mode, in order to save the signaling overhead and avoid excessively frequent channel feedback.
- a UE with a motion speed of 100 km/h or more is defined as a high-speed UE
- the UE adopts the MIM0 method based on the ring-ring transmit diversity
- the UE with a motion speed of 100 km/h or less is defined as a low-speed UE, which can adopt the closed-loop MIM0 mode, including SU-MIM0, MJ-MIM0, beamforming, multi-user MIM0 combined with beamforming, etc. (S403 ⁇ S408).
- BS performs resource scheduling
- the BS allocates resources to the central UE and the edge UE, and schedules resources (S409 and S410).
- FDM Frequency Division Multiplexing
- the BS allocates resources to the central UE and the edge UE, and schedules resources (S409 and S410).
- FDM Frequency Division Multiplexing
- edge UEs of neighboring cells have different frequency bands to avoid co-channel interference.
- the frequency bandwidth of the three radio cells is BW.
- the black area represents the area where the center UE is located
- the white area represents the area where the edge UE is located
- the three base stations set the adjacent areas to be in different frequency bands. That is, the three frequency bands of Al, Bl, and CI do not intersect each other, so that the occurrence of co-channel interference can be avoided.
- the transmitter and receiver work in space-time-frequency three-dimensional space, so it will come out.
- RBs resource blocks
- the spatial or non-spatial selectivity of the channel can be fully utilized, and the resource block (RB) or the resource block group (GRB) selects the best CQI.
- the precoding matrix index number is used as the precoding matrix index number to be fed back, as shown in FIG.
- the size of the spatial precoding matrix index number Q is determined by the size of the codebook of the transmitter's precoder: the codebook represented by 3 bits, then the maximum value of Q is 2 3 ; the code represented by 4 bits In this case, the maximum value of Q is 2 4 ; if it is a codebook represented by 5 bits, the maximum value of Q is 2 S.
- each RB adopts an information feedback manner of the optimal precoding matrix index number (as shown in FIG. 4b, step S411), and each RB finds the best precoding matrix index number of the CQI among all the precoding matrix index numbers.
- the precoding matrix index number used as the feedback as shown in FIG. 9, if it is necessary to feed back the CQI values of the three RBs, the three resource blocks of the best RB2, RB5, and RB9 of the CQI are sequentially found, and the three RBs are used.
- the precoding matrix index numbers Q1, Q2, and Q3 are used as feedback precoding matrix index numbers.
- each RB of the edge UE can adopt an RB-based adaptive information feedback manner (as shown in FIG. 4b, step S411).
- the adaptive information feedback method based on RB reduces the feedback amount by sacrificing feedback precision.
- the average value PMIave of the precoding matrix index number (PMI) of all RBs at the initial time is fed back (corresponding to the above).
- PMI precoding matrix index number
- Reference value however, the present invention is not limited to the average value of the PMI, and the above reference value may also be any value specified by the user, the PMI value of the first or any RB or GRB, or by each or a certain RB or GRB.
- the average value of the precoding matrix index number is the mathematical average of all RB precoding matrix index numbers, and if the precoding matrix index number is defined as 16 levels, the average value in FIG. 10 is 8, Then, feedback the difference between each RB and the average value; when the channel is a non-spatial selective channel, for the structured precoded codebook, adjacent RBs behave the same or similar Inter characteristics, so several adjacent RB The RB group (GRB) can be formed. As shown in FIG.
- the feedback of the precoding matrix index number by the GRB can greatly reduce the feedback amount, and because the spatial characteristics of the adjacent GRBs also have the same or similar spatial characteristics, the center UE is In this case, an improved information feedback manner of the optimal precoding matrix index number can be used, as shown in FIG. 12: A recoding and re-reconstruction of the RB precoding matrix index number curve is performed to obtain a new precoding matrix.
- the index number curve that is, GRB1 includes two resource blocks of RB1 and RB2, and the average value of the RB1 precoding matrix Soongyi I and RB2 precoding matrix index numbers is obtained after one reconstruction, but the average value may not be an integer or not Encoding the value of the quantization value of the matrix index number, so it is necessary to perform secondary reconstruction to make the average value an integer and fall in the value field of the quantization value of the precoding matrix index number; and then in the non-spatial selective channel environment Compare the feedback amount of the precoding matrix index number under the three schemes.
- Scheme 1 adopts a method of performing full feedback of precoding matrix index numbers for each RB; scheme 2 adopts a method of packet RB full feedback; scheme 3 adopts a method of packet RB adaptive feedback, that is, all RBs are taken.
- the average value is obtained as an average precoding matrix index number value CU, and the UE first feeds back and feedbacks the change value of the precoding matrix index number of each GRB; if the precoding matrix index number of the GRB at the next moment is compared with the previous one If the precoding matrix index number of the GRB does not change, the precoding matrix index number is not fed back.
- the precoding matrix index number of the GRB at the next moment is too small compared to the precoding matrix index number of the GRB at the previous moment, Do not feed back any precoding matrix index number value, but at this time, set the threshold value of the precoding matrix index number change (corresponding to the predetermined threshold value), the above threshold value can be determined by the user according to the actual PMI level, also It can be obtained by calculation based on the actual PMI level. It can be found from Table 1 that in the spatial non-selective channel environment, the feedback method using the packet or adaptive precoding matrix index number can greatly reduce the feedback amount and improve the feedback efficiency, thereby saving the valuable value of the uplink. Spectrum_resource, saving the battery power of the UE. For the edge UE, the GRB-based adaptive precoding matrix index number feedback method can be adopted, and the idea is the same as the RB-based adaptive precoding matrix index number feedback method in the foregoing, the only difference is that the GRB is the minimum. unit.
- an RB-based adaptive information feedback manner and a GRB-based adaptive information feedback manner may be respectively adopted in the time domain, specifically, in the initial frame, all RBs or GRBs are fed back.
- the average value of the PMI (corresponding to the above reference value, however, the present invention is not limited to the average value of the PMI, and the above reference value may also be any value specified by the user, the PMI value of the first or any RB or GRB, Or the value derived from the PMI of each RB or GRB), then, the first RB feeds back the amount of change between the first PMI and the average of the PMI, and the second RB feeds back the second PMI and PMI The amount of change compared to the average value, and so on; in the next TTI, if there is no change or little change (less than the predetermined threshold), no feedback is given.
- each resource block of the central user or the edge user is frequency incoherent in different frequency bands of the entire bandwidth, as shown in FIG. 14a.
- each resource block of the central UE uses the optimal CQI information feedback mode when feeding back the CQI, that is, the CQI value of the resource block with the best CQI performance.
- each resource block of the edge UE adopts an RB-based adaptive information feedback method when feeding back the CQI, and the basic idea is the same as the precoding matrix index number in the above.
- the feedback method is the same, the only difference is that it is the feedback CQI value at this time, that is, first, the average value of the CQIs of all the RBs is fed back (corresponding to the above reference value, but the present invention is not limited to the average value of the CQI, and the above reference value is also It may be any value specified by the user, the CQI value of the first or any RB or GRB, or the value derived from the CQI of each or a certain RB or GRB), and then the first RB feeds back the first CQI and The amount of change in the average value of the CQI, the second RB feedbacks the amount of change in the second CQI compared to the average of the CQI.
- each resource block of the central UE adopts an improved optimal CQI information feedback manner in the CQI, that is, a resource block adjacent to the frequency band is composed of one resource block group (GRB), GRB.
- GRB resource block group
- the predetermined threshold value may be determined by the user according to the actual CQI level, or may be obtained by calculation according to the actual CQI level.
- the central user can adopt the improved optimal CQI feedback method based on RB, as shown in FIG. 15; when using this feedback method, combined with the time domain adaptive feedback method, such as Figure 16 shows.
- the principle of the improved optimal CQI feedback method based on RB is as follows: First, in the initial state, a method for performing an optimal CQI value for all RBs at the UE end (Best M), finding the best CQI from the N RBs M RBs, the UE reports the CQI and the corresponding CQI value of the M RBs on the BS side, and each CQI value is represented by 5 bits; when one TTI is passed in the time domain, the previous CQI value is used by the CQI detector.
- the change is detected, and the CQI detector sets a certain threshold. If an RB is within the threshold when the start time of the TTI is lower than the previous CQI value, the CQI is considered to be unchanged, as shown in FIG. Marked RB-2, RB-4, etc. If an RB changes more than the threshold value at the beginning of the TTI compared to the previous CQI value, a new CQI value is recorded, as in the black mark RB_1 in FIG.
- RB_3, RB_5, RB-M perform a Best M algorithm to find the M RBs of the best CQI from the N RBs; and compare the C I values of the new M RBs and the previous M RBs, If the new RB is found to coincide with the CQI of the previous RB, the CQI is passed.
- the detection result of the detector observes whether the CQI of the CQI coincident RB changes.
- the UE side feeds back the CQI value of the current TTI, and the CQI values include the new M RBs that do not coincide with the CQI of the previous M RBs.
- the central user can adopt the improved optimal CQI feedback method based on GRB, as shown in Fig. 17; the feedback method still needs to combine the time domain adaptive feedback method. , as shown in Figure 16.
- the CQI values of different RB/RBGs are 1, 2, ..., 5 respectively; when arriving at time 2, the CQI values of different RB/RBGs are not changed, so the UE does not feed back CQI information in time 2 to BS;
- the CQI value of the RB/RBG with a CQI value of 1 becomes 5, and the CQI values of other RB/RBGs are not changed.
- the RB/RBG feedback CQI information whose CQI value becomes 5 is given to the BS.
- the adaptive decision algorithm is continuously performed on the time axis.
- the idea and principle of the improved optimal CQI feedback method based on GRB is basically the same as the improved optimal CQI feedback method based on RB. The only difference is that the feedback method utilizes the frequency non-selection characteristic of the channel to perform RB on the RB. Grouping, further reducing the amount of feedback and improving feedback efficiency. It can be seen from Table 3 that the performance of the modified Best M feedback method based on GRB is further improved. In FIG.
- an RB-based adaptive information feedback manner and a GRB-based adaptive information feedback manner may be respectively used in the time domain, specifically, in the initial TTI, all RBs are fed back or
- the average value of the CQI of the GRB (corresponding to the above reference value, however, the present invention is not limited to the average value of the CQI, and the above reference value may also be any value specified by the user, the CQI value of the first or any RB or GRB.
- the first RB feeds back the amount of change between the first CQI and the average of the CQI
- the second RB feeds back the second CQI with The average value-to-value ratio of the CQI is changed, and so on.
- the CQI does not change or the change is small (less than the predetermined threshold)
- no feedback is given.
- the CQI changes, the current CQI is fed back to the initial The amount of change in the average of the CQI fed back at TTI. Therefore, the number of feedbacks in the time domain will be greatly reduced.
- the average value of the CQIs of all RBs or RB groups at the time of the TTI may be fed back again for a predetermined period of time to correct the long-term error accumulation.
- the above-mentioned RB-based improved optimal CQI feedback mode and GRB-based improved optimal CQI feedback mode have been considered for the central UE, and the channel is time-selective and In the case of non-selectivity, both algorithms use an adaptive idea in the time domain, that is, using a CQI detector.
- the detection threshold is set, and the UE makes full use of the result of the previous TTI CQI detection when performing the CQI feedback in this TTI.
- the adaptive decision algorithm on the time dimension is performed, and therefore, in the time domain The number of feedbacks will be greatly reduced.
- the RB-based adaptive information feedback mode and the GRB-based adaptive information feedback mode may be respectively adopted in the time domain. Specifically, in the initial TTI, the average of the CQIs of all the RBs or RB groups is fed back. Value (corresponding to the above reference value, however, the present invention is not limited to the flatness of the CQI; 1 value, the above reference value may also be any value specified by the user, the CQI value of the first or any RB or GRB, or The calculated value of the CQI of each RB or GRB), then, the first RB feeds back the change of the first CQI and the average of the CQI, and the second RB feeds back the average of the second CQI and CQI.
- the amount of change compared to the value, and so on; in the next ⁇ if the CQI does not change or the change is small (less than the predetermined threshold), then no feedback, if the CQI changes, feedback the current CQI and the feedback of the initial ⁇
- the amount of change in the mean of the CQI Therefore, the number of feedbacks in the time domain will be greatly reduced.
- the predetermined threshold value may be determined by the user according to the actual CQI level, or may be obtained by calculation according to the actual CQI level.
- the average value of the CQIs of all RBs or RB groups at the time of the ⁇ can be fed back again for a predetermined period of time to correct the long-term error accumulation. effect.
- the downlink MIM0 system Since the downlink MIM0 system has multiple MIM0 modes, and the BS has different performance index requirements for different MIM0 modes, it is necessary for the UE to feed back the rank (Rank) information of the downlink MIM0, and the rank occupies a certain amount of feedback information, as shown in the figure. 3 is shown.
- the 3GPP organization LTE conference has determined that the downlink MIM0 system uses up to four transmit antennas and four receive antennas. Therefore, regarding the relationship between rank (Rank), layer (Layer), and codeword (Codeword) in the downlink MIM0 system. As shown in FIG. 18 to FIG.
- the UE side feeds up at most 2 code words to the precoder of the BS end, and layer 1, layer 2, layer 3, and layer 4 share 2 code words, and can also be defined as shown in FIG. 23.
- the UE side can feed back two or more code words to the precoder of the BS side, and FIG. 23 to FIG. 24 show that layer 1, layer 2, layer 3, and layer 4 share three code words, and FIG. 25 shows layer 1 Layer 2, Layer 3, and Layer 4 share 4 code words.
- the MIM0 mode of different UEs can be flexibly set according to different UE motion speeds and path loss on the premise of ensuring the overall throughput and edge throughput of the radio cell, and at the same time, different MIM0s.
- the method can also set different rank feedback methods, and finally achieve the reduction of the uplink feedback amount under the premise of ensuring performance.
- the BS performs transmitter optimization based on the feedback information, and measures and evaluates the performance of the wireless cell.
- the BS optimizes the transmitter according to the feedback information of the space-time-frequency three-dimensional space reported by the central UE and the edge UE, and mainly optimizes the precoder by using the index of the MIM0 and the index number of the pre-coded codebook, and calculates the wireless.
- the overall throughput and edge throughput of the cell are evaluated for the quality of service of the wireless cell, and reported to the upper management information system, as shown in FIG.
- Figure 26 is an overall block diagram of an information feedback system based on space-time frequency domain three-dimensional space.
- the information feedback system shown in FIG. 26 can perform the functions as shown in FIGS. 4a, 4b, 4c, and 4d, wherein the OFDM mapper T6 of FIG. 26 can implement the function of resource scheduling, and therefore steps S401 to S417 are completed by the OFDM mapper T6.
- the function of the specific software and hardware implementation of the information feedback system based on the space-time frequency domain three-dimensional space is shown in Figure 26: At the base station end, the source encoder T1 sends the original data stream, passes through the channel encoder T2, and then uses channel interleaving.
- the device ⁇ 3 interleaves the data, after the interleaving is completed, the data is input into the digital modulator ⁇ 4, and then pre-coded by the precoder ⁇ 5, and then passed through the OFDM mapper T6, the OFD signal generator T7, the data channel framing ⁇ 8, and the pilot channel.
- the channel multiplexer T10, the DAC digital-to-analog converter T11 the data is sent to the RF ⁇ RF module T12 for transmission; at the UE end, the RF data is converted into the baseband signal by the RF RX down-conversion module R1 and the ADC analog-to-digital converter R2.
- the baseband signal passes through the channel multiplexer R3, the pilot channel deframing R4, the data channel deframing R5, the channel estimator R6, the data detector R7, the digital demodulator R8, the channel deinterleaver R9, and the channel decoder R10.
- the final required data is obtained.
- the feedback information such as the rank, the precoding matrix index number, and the CQI is fed back to the precoder of the BS through the uplink, as shown in FIG.
- Figure 27 is a functional block diagram of an information feedback system based on space-time frequency domain three-dimensional space in accordance with the present invention.
- the user equipment UE 2600 includes: a receiving unit 2610, a channel space selectivity determining unit 2620, a channel frequency selectivity determining unit 2630, a channel time selective determining unit 2640, and an information feedback mode selecting unit 2650. Wait.
- the receiving unit 2610 is configured to receive, by the base station BS 2700, a determination result that the user equipment UE 2600 is a central user equipment or an edge user equipment.
- the channel space selectivity determining unit 2620 is configured to determine that the user equipment UE 2600 is used.
- the information feedback mode selection unit 2650 is configured to: according to the judgment result from the base station BS 2700 regarding whether the user equipment UE 2600 is a central user equipment or an edge user equipment, spatially selective or non-selective of the channel, The frequency selective or non-selective of the channel, and the temporal or non-selective of the channel, select the corresponding information feedback mode.
- the information feedback mode selecting unit 2650 feeds back the feedback information to the frequency allocation and resource scheduling unit 2780 of the base station BS 2700 through the uplink, and the frequency allocation and resource scheduling unit 2780 of the base station BS 2700 performs resource scheduling, thereby improving the performance of the wireless cell, such as Figure 27 shows.
- the channel space selectivity determining unit 2620 determines that the channel is a spatially selective channel
- the resource block of the user equipment determined by the base station as the central user equipment feeds back the channel quality indicating the best precoding matrix index number, but is
- the base station determines that the user equipment of the edge user equipment adopts a resource block-based spatial domain adaptive information feedback manner, that is, firstly, feedbacks the reference value of the precoding matrix index number of all resource blocks at the initial time, and then each resource block feeds back its current current current The amount of change in the precoding matrix index number of the time compared to the reference value of the precoding matrix index number.
- the user equipment groups the resource blocks adjacent to the spatial location into a resource block group, and is determined by the base station as the user equipment of the central user equipment.
- Each resource block group feedback channel quality indicates the best performance precoding matrix index number
- the user equipment determined by the base station as the edge user equipment uses the spatial domain adaptive information feedback manner based on the resource block group, that is, first, feedback
- the initial time is a reference value of the precoding matrix index number of all resource block groups, and then each resource block group feeds back a change amount of the precoding matrix index number of the current time compared with the reference value of the precoding matrix index number.
- the base station is The user equipment determined as the edge user equipment does not feed back the amount of change of the precoding matrix index number of its current time compared with the reference value of the precoding matrix index number.
- the channel frequency selectivity determining unit 2630 determines that the channel is a frequency selective channel
- the resource block of the user equipment determined by the base station as the central user equipment feeds back the channel quality indication value with the best performance, and is determined by the base station as the edge user.
- the user equipment of the device adopts a resource block-based frequency domain adaptive information feedback manner, that is, firstly, feedbacks the reference value of the channel quality indicator value of all resource blocks at the initial time, and then each resource block feeds back the channel quality indicator of the current time. The amount of change in value compared to the reference value of the channel quality indicator value.
- the channel frequency selectivity determining unit 2630 determines that the channel is a non-frequency selective channel
- the user equipment groups the resource blocks adjacent to the frequency location into a resource block group, and each of the user equipments determined by the base station as the central user equipment
- the resource block group feedback channel quality indicates the best performance channel quality indicator value
- the user equipment determined by the base station as the edge user equipment adopts frequency domain adaptive information based on the resource block group.
- the feedback mode that is, first, the reference value of the channel quality indicator value of the initial time instant for all resource block groups is fed back, and then each resource block group feeds back the channel quality indicator value of the current time and the reference value of the channel quality indicator value. The amount of change.
- the base station determines the edge as the edge.
- the user equipment of the user equipment does not feed back the amount of change in the channel quality indicator value of its current time compared to the reference value of the channel quality indicator value.
- the channel time selectivity determining unit 2640 determines that the channel is a time selective channel
- the resource block of the user equipment determined by the base station as the central user equipment feeds back the channel quality indicating the best channel quality indicator value, and is determined by the base station as the edge user.
- the user equipment of the device adopts a resource block-based time domain adaptive information feedback manner, that is, firstly, the reference value of the channel quality indicator value of all resource blocks is fed back at the initial time, and then each resource block feeds back the channel quality indicator of the current time. The amount of change in value compared to the reference value of the channel quality indicator value.
- the user equipment groups the resource blocks adjacent to the frequency location into a resource block group, and each of the user equipments determined by the base station as the central user equipment
- the resource block group feedback channel quality indicates the best performance channel quality indicator value
- the user equipment determined by the base station as the edge user equipment adopts the time domain adaptive information feedback mode based on the resource block group, that is, first, the feedback initial time A reference value for the channel quality indicator value of all resource block groups, and then each resource block group feeds back a change in the channel quality indication of its current time compared to the reference value of the channel quality indicator value.
- the base station determines the edge as the edge.
- the user equipment of the device does not feed back the amount of change in the channel quality indicator value of its current time compared to the reference value of the channel quality indicator value.
- the base station BS 2700 includes: a path loss measuring unit 2710, a user equipment dividing unit 2720, a motion speed measuring unit 2740, an MD/10 mode selecting unit 2750, and a service type determining unit 2760.
- the path loss measuring unit 2710 is configured to measure a path loss of each user equipment UE 2600.
- the user equipment dividing unit 2720 is configured to divide the user equipment UE 2600 into a central user equipment and an edge user equipment according to the path loss size;
- the unit 2740 is configured to measure the motion speed of each user equipment UE 2600.
- the mode selection unit 2750 is configured to: after the user equipment dividing unit 2720 divides the user equipment UE 2600 into the central user equipment and the edge user equipment according to the path loss, the motion speed is high.
- the central user equipment or the edge user equipment choose the open loop MIM0 mode, for the center with low speed
- the user equipment or the edge user equipment selects the closed-loop MIM0 mode
- the service type determining unit 2760 is configured to determine the service type of each user equipment UE 2600
- the wireless cell quality of service determining unit 2770 is configured to determine the quality of service of the wireless cell
- the resource scheduling unit 2780 is configured to: after the user equipment dividing unit 2720 divides the user equipment UE 2600 into the central user equipment and the edge user equipment according to the path loss, use the frequency division multiplexing manner to the central user equipment and the neighboring wireless cell.
- the edge user equipment allocates different frequency bands and performs resource scheduling
- the sending unit 2730 is configured to send, to the corresponding user equipment, a determination result that the user equipment 2600 is a central user equipment or an edge user equipment, and is used for the MIM0 mode.
- the corresponding MIM0 mode selected by the selection unit 2750 is notified to the corresponding user equipment. As shown in FIG.
- the MIM0 mode selection unit 2750, the user equipment division unit 2720, the service type determination unit 2760, and the radio cell quality of service determination unit 2770 transmit information to the frequency allocation and resource scheduling unit 2780, and the frequency allocation and resource scheduling unit 2780
- frequency division multiplexing is used to allocate different frequency bands to the central user equipment and the edge user equipment, and then the information fed back by the uplink is used for resource scheduling.
- the MIM0 manner selecting unit 2750 determines the path loss, the motion speed, and the service type according to the central user equipment and the edge user equipment. And combining the wireless cell service quality, according to the following criteria, selecting the MIM0 mode of the different user equipment BS 2600: according to the path loss of the central user equipment and the edge user equipment measured by the path loss measuring unit 2710, the central user equipment with large path loss or The edge user equipment adopts the MIM0 mode with low multiplexing gain.
- the central user equipment or the edge user equipment with small path loss adopts the MIM0 mode with high multiplexing gain; the motion of the central user equipment and the edge user equipment measured by the motion speed measuring unit 2740
- the central user equipment or the edge user equipment with high speed and high speed adopts the open-loop MIM0 mode, and the central user equipment or the edge user equipment with low motion speed adopts the closed-loop MIM0 mode; according to the service type determining unit 2760
- the service type of the user equipment and the edge user equipment, the central user equipment or the edge user equipment with large data transmission volume adopts the closed-loop MIM0 mode, and the central user equipment or the edge user equipment with small data transmission and high precision requirements adopts the MIM0 of the ring ring.
- Mode According to the quality of the wireless cell service, various MIM0 modes of different user equipments can ensure the quality of service requirements of the entire wireless cell including overall throughput, edge throughput, and transmission accuracy.
- the base station BS 2700 sets the information feedback manner of the airspace, the frequency domain, and the time domain three-dimensional space according to the rank, layer, codeword of the downlink MIM0 system and the wireless cell service quality, so as to reduce the feedback under the premise of ensuring system performance.
- the overhead of the link is not limited to the following abbreviations: “A” and “B”
- the base station BS 2700 adopts an information feedback method based on multiple codewords, and the number of codewords of the base station transmitter is adopted. Use 1, 2, 3 or 4.
- the base station BS 2700 calculates the overall throughput and edge throughput of the wireless cell, measures and evaluates the quality of service of the wireless cell, and then combines the measurement results of the quality of service of the wireless cell with the motion speed of the central user equipment and the edge user equipment. , path loss and service type, adjusting the MIM0 mode of the central user equipment or the edge user equipment, and optimizing the transmitter according to the space-time frequency domain three-dimensional feedback information of the central user equipment and the edge user equipment, wherein the optimization design includes Reasonable allocation of transmit power, spectrum resources, channels, bits, and appropriate adaptive coded modulation schemes, scheduling algorithms.
- the information feedback method and system based on space-time frequency domain three-dimensional space, user equipment and base station have the characteristics of simple feedback mechanism, small feedback amount, and saving uplink spectrum overhead, and have certain universality, and can be adapted to general Closed-loop MIM0 communication system, which can be third generation (3G), super three generation (S3G), fourth generation (4G) cellular mobile communication and digital television (DTV), wireless local area network (WLAN:), wireless wide area network (WWAN) and other systems
- the downlink MIM0 link provides an information feedback method and system.
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EP08800526A EP2190130A1 (en) | 2007-09-12 | 2008-08-25 | Information feedback method, system, user device, and base station based on space, time and frequency domain |
JP2010522166A JP2010537599A (ja) | 2007-09-12 | 2008-08-25 | 時間・空間・周波数領域に基づく情報フィードバック方法、ユーザ装置、および基地局 |
US12/677,491 US20100284351A1 (en) | 2007-09-12 | 2008-08-25 | Space-time-frequency domain based information feedback method, user equipment and base station thereof |
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Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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JP2011504308A (ja) * | 2007-10-02 | 2011-02-03 | ノーテル・ネットワークス・リミテッド | 無線通信の開ループ・マルチアンテナモード用のランクアダプテーション |
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US8565334B2 (en) | 2009-03-24 | 2013-10-22 | Fujitsu Limited | Radio communication system, terminal apparatus, base station apparatus, and radio communication method for radio communication system |
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Families Citing this family (75)
Publication number | Priority date | Publication date | Assignee | Title |
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US8885551B2 (en) | 2009-07-06 | 2014-11-11 | Qualcomm Incorporated | Multiuser scheduling in WLAN systems |
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US8725084B2 (en) * | 2009-11-23 | 2014-05-13 | Cisco Technology, Inc. | MIMO mode switch management for beamformed MIMO systems |
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US8406332B2 (en) * | 2010-01-18 | 2013-03-26 | Research In Motion Limited | Downlink transmission in a multiple-user multiple-input multiple-output (“MU-MIMO”) wireless communication system |
EP2528244B1 (en) | 2010-01-22 | 2018-03-07 | LG Electronics Inc. | Method and apparatus for providing downlink control information in an mimo wireless communication system |
US9148205B2 (en) * | 2010-01-25 | 2015-09-29 | Qualcomm Incorporated | Feedback for supporting SU-MIMO and MU-MIMO operation in wireless communication |
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US20110255483A1 (en) * | 2010-04-16 | 2011-10-20 | Research In Motion Limited | Signaling of Precoding Granularity for LTE and LTE-A |
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US8687527B2 (en) * | 2010-09-16 | 2014-04-01 | Nec Laboratories America, Inc. | Low complexity link adaptatation for LTE/LTE-A uplink with a turbo receiver |
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JP5609991B2 (ja) * | 2011-01-14 | 2014-10-22 | 富士通株式会社 | 移動通信システム、基地局装置及び通信制御方法 |
CN102624500A (zh) * | 2011-01-26 | 2012-08-01 | 上海华为技术有限公司 | Cqi上报方法、获取cqi的方法、系统、终端及基站 |
CN102158310A (zh) * | 2011-02-15 | 2011-08-17 | 中兴通讯股份有限公司 | 一种实现多小区预编码的方法和装置 |
JP6026082B2 (ja) | 2011-04-05 | 2016-11-16 | シャープ株式会社 | 端末、基地局、通信方法および集積回路 |
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US20120314590A1 (en) * | 2011-06-10 | 2012-12-13 | Sharp Laboratories Of America, Inc. | Enhanced precoding feedback for multiple-user multiple-input and multiple-output (mimo) |
US9191961B2 (en) * | 2011-06-17 | 2015-11-17 | Lg Electronics Inc. | Method for allocating wireless resources in wireless access system and device therefore |
US20130022142A1 (en) * | 2011-07-20 | 2013-01-24 | Sairamesh Nammi | Base station and method for implementing an adaptive closed-loop mimo and open-loop mimo technique in a wireless communication system |
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US8644181B2 (en) * | 2011-08-16 | 2014-02-04 | Hong Kong Applied Science and Technology Research Institute Company Limited | Method and apparatus for estimation of channel temporal correlation and MIMO mode selection in LTE system |
US8693431B2 (en) * | 2011-09-14 | 2014-04-08 | Qualcomm Incorporated | Methods and apparatus for interference based joint scheduling of peer to peer links with WWAN |
US9408217B2 (en) * | 2012-01-17 | 2016-08-02 | Qualcomm Incorporated | Maximum power reduction for interference control in adjacent channels |
EP2807756B1 (en) * | 2012-01-23 | 2021-05-26 | Telefonaktiebolaget LM Ericsson (publ) | Method and device for selecting precoding matrices based on representations of speed of related devices |
EP2804437B1 (en) * | 2012-02-15 | 2016-04-20 | Huawei Technologies Co., Ltd. | Method and device for resource allocation |
EP2822314A4 (en) * | 2012-02-29 | 2015-10-28 | Kyocera Corp | COMMUNICATION CONTROL PROCEDURE, USER DEVICE AND BASE STATION |
CN102771062B (zh) * | 2012-04-11 | 2014-12-03 | 华为技术有限公司 | 一种传输模式配置方法和装置 |
US8908747B2 (en) | 2012-05-22 | 2014-12-09 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for controlling adaptive rank multi antenna communication |
US9337973B2 (en) * | 2012-09-11 | 2016-05-10 | Industrial Technology Research Institute | Method of cooperative MIMO wireless communication and base station using the same |
TWI750107B (zh) | 2012-09-28 | 2021-12-21 | 美商內數位專利控股公司 | 用於提供波束成形回饋的無線發射/接收單元(wtru)及用於其的方法 |
KR101980091B1 (ko) | 2012-10-18 | 2019-05-20 | 삼성전자주식회사 | 무선 통신 시스템에서 기지국 협력 통신 방법 및 장치 |
CN103795450B (zh) * | 2012-10-29 | 2017-10-31 | 电信科学技术研究院 | 传输编码指示信息和确定预编码矩阵的方法、系统及设备 |
US8971437B2 (en) * | 2012-12-20 | 2015-03-03 | Google Technology Holdings LLC | Method and apparatus for antenna array channel feedback |
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WO2014129843A1 (en) * | 2013-02-24 | 2014-08-28 | Lg Electronics Inc. | Method and apparatus for reporting downlink channel state |
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US9214981B1 (en) * | 2013-12-02 | 2015-12-15 | Sprint Communications Company L.P. | Configurable antenna port selection for beam forming and MIMO in a telecommunications network |
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US9705581B2 (en) * | 2014-09-24 | 2017-07-11 | Mediatek Inc. | Synchronization in a beamforming system |
US9698884B2 (en) | 2014-09-24 | 2017-07-04 | Mediatek Inc. | Control signaling in a beamforming system |
WO2016080571A1 (ko) * | 2014-11-20 | 2016-05-26 | 엘지전자 주식회사 | 셀 간 간섭 제거를 위한 셀 간 정보를 송수신하는 방법 및 장치 |
CN104507169B (zh) * | 2014-12-15 | 2017-12-22 | 东南大学 | 降低系统上行传输时延的三维资源动态分配方法和装置 |
US9762456B2 (en) | 2015-03-17 | 2017-09-12 | Telefonaktiebolaget Lm Ericsson (Publ) | Access node, control node, and various methods for adapting a reporting period for a user equipment |
CN109076505A (zh) | 2016-03-30 | 2018-12-21 | 日本电气株式会社 | 用于传输和接收参考信号的方法和装置 |
WO2018163230A1 (ja) * | 2017-03-06 | 2018-09-13 | 三菱電機株式会社 | 移動端末、無線基地局、およびビーム送受信方法 |
US10158454B1 (en) | 2017-06-15 | 2018-12-18 | At&T Intellectual Property I, L.P. | Adaptive interleaver for wireless communication systems |
CN107734698B (zh) * | 2017-11-29 | 2020-04-14 | 京信通信系统(中国)有限公司 | 一种资源分配的方法、装置及存储介质 |
CN112165439A (zh) | 2018-01-25 | 2021-01-01 | 华为技术有限公司 | 一种信道估计方法和装置 |
US20210022153A1 (en) * | 2018-03-23 | 2021-01-21 | Ntt Docomo, Inc. | Base station and transmission method |
CN113271130B (zh) | 2018-05-11 | 2024-04-09 | 华为技术有限公司 | 信道估计方法和装置 |
EP3799679A1 (en) * | 2018-07-06 | 2021-04-07 | Huawei Technologies Co., Ltd. | Devices and methods for adaptively adjusting a mimo transmission scheme |
US10887046B2 (en) | 2018-11-02 | 2021-01-05 | At&T Intellectual Property I, L.P. | Performance based on inferred user equipment device speed for advanced networks |
CN111510189B (zh) * | 2019-01-30 | 2021-09-14 | 华为技术有限公司 | 信息反馈方法及装置 |
CN110518961B (zh) * | 2019-08-29 | 2020-12-11 | 东南大学 | 大规模mimo卫星移动通信方法及系统 |
US11431395B2 (en) * | 2019-10-29 | 2022-08-30 | Nokia Technologies Oy | Mapping of windowed FD basis to a combinatorial indicator for PMI reporting and usage |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1555612A (zh) * | 2001-05-03 | 2004-12-15 | �����ɷ� | 控制无线通信系统上行链路传输的方法和设备 |
CN1801686A (zh) * | 2006-01-04 | 2006-07-12 | 东南大学 | 基于瞬时和统计信道信息的多天线信道反馈方法 |
CN1909437A (zh) * | 2005-04-20 | 2007-02-07 | 三星电子株式会社 | 用于蜂窝通信的自适应反馈方法 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6473467B1 (en) * | 2000-03-22 | 2002-10-29 | Qualcomm Incorporated | Method and apparatus for measuring reporting channel state information in a high efficiency, high performance communications system |
JP3796188B2 (ja) * | 2002-04-09 | 2006-07-12 | パナソニック モバイルコミュニケーションズ株式会社 | Ofdm通信方法およびofdm通信装置 |
EP1494381B1 (en) * | 2002-04-09 | 2013-06-12 | Panasonic Mobile Communications Co., Ltd. | Ofdm communication method and ofdm communication device |
CN1998211B (zh) * | 2004-06-16 | 2010-05-12 | 三星电子株式会社 | 在使用正交频分多路接入方案的移动通信系统中发送/接收数据的方法 |
JP2007174337A (ja) * | 2005-12-22 | 2007-07-05 | Toshiba Corp | セルラ通信システム、管理局装置および通信制御方法 |
-
2007
- 2007-09-12 CN CNA2007101489142A patent/CN101388699A/zh active Pending
-
2008
- 2008-08-25 JP JP2010522166A patent/JP2010537599A/ja active Pending
- 2008-08-25 EP EP08800526A patent/EP2190130A1/en not_active Withdrawn
- 2008-08-25 US US12/677,491 patent/US20100284351A1/en not_active Abandoned
- 2008-08-25 WO PCT/CN2008/001525 patent/WO2009033358A1/zh active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1555612A (zh) * | 2001-05-03 | 2004-12-15 | �����ɷ� | 控制无线通信系统上行链路传输的方法和设备 |
CN1909437A (zh) * | 2005-04-20 | 2007-02-07 | 三星电子株式会社 | 用于蜂窝通信的自适应反馈方法 |
CN1801686A (zh) * | 2006-01-04 | 2006-07-12 | 东南大学 | 基于瞬时和统计信道信息的多天线信道反馈方法 |
Non-Patent Citations (2)
Title |
---|
"CQI Feedback Scheme for E-UTRA", 3GPP TSG RAN MEETING, 12 February 2007 (2007-02-12) |
"MINO System Performance with Variable Frequency Granularity of UE feedback", 3GPP TSG RANI MEETING, 15 January 2007 (2007-01-15) |
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US8565334B2 (en) | 2009-03-24 | 2013-10-22 | Fujitsu Limited | Radio communication system, terminal apparatus, base station apparatus, and radio communication method for radio communication system |
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JP2010273345A (ja) * | 2009-05-25 | 2010-12-02 | Ntt Docomo Inc | チャネル情報フィードバック方法、プリコーディング方法、受信局及び送信局 |
US8923143B2 (en) | 2009-06-29 | 2014-12-30 | Qualcomm Incorporated | Open loop channel reporting in a wireless communication system |
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US9112741B2 (en) | 2009-09-18 | 2015-08-18 | Qualcomm Incorporated | Protocol to support adaptive station-dependent channel state information feedback rate in multi-user communication systems |
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US8902834B2 (en) | 2009-12-21 | 2014-12-02 | Fujitsu Limited | Feedback interval control |
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Also Published As
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JP2010537599A (ja) | 2010-12-02 |
EP2190130A1 (en) | 2010-05-26 |
CN101388699A (zh) | 2009-03-18 |
US20100284351A1 (en) | 2010-11-11 |
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