WO2009100567A1 - 长期统计csi辅助mu-mimo调度方法、基站和用户设备 - Google Patents
长期统计csi辅助mu-mimo调度方法、基站和用户设备 Download PDFInfo
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- WO2009100567A1 WO2009100567A1 PCT/CN2008/000238 CN2008000238W WO2009100567A1 WO 2009100567 A1 WO2009100567 A1 WO 2009100567A1 CN 2008000238 W CN2008000238 W CN 2008000238W WO 2009100567 A1 WO2009100567 A1 WO 2009100567A1
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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
- H04B7/0452—Multi-user MIMO systems
-
- 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
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
-
- 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
-
- 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
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
Definitions
- the present invention relates to the field of wireless communications, and in particular, to a long-term statistical channel state information (CSI)-assisted multi-user multiple-input multiple-output (MU-MIMO) scheduling method, a base station, and a user equipment, with the purpose of reducing Feedback overhead for joint MU-MIMO and multi-user scheduling.
- CSI channel state information
- MU-MIMO multi-user multiple-input multiple-output
- MU-MIMO offers the advantage of large capacity compared to single-user MIMO (SU-MIMO).
- SU-MIMO single-user MIMO
- the MU-MIMO provides an efficient way to address throughput bottlenecks in wireless communication systems.
- MU-MIMO has the potential to multiply system capacity.
- the base station (BS) needs to know the complete channel state information (CSI) of all users in the cell, not just the CSI of the active user for which the service is selected. This will result in heavier feedback overhead in Frequency Division Duplex mode (FDD).
- FDD Frequency Division Duplex mode
- FDD Frequency Division Duplex mode
- FDD Frequency Division Duplex mode
- the basic principle of this scheme is to use the long-term statistical CSI of all users to reduce the feedback overhead required for the joint MU-MIMO scheduling scheme.
- the joint MU-MIMO scheduling operation can be divided into a scheduling phase and a multi-user precoding phase.
- a scheduling phase a set of active users are selected from all users based on total capacity maximization or other criteria, which will be assigned to the same time and frequency resources.
- the BS In the multi-user precoding stage, the BS generates a precoding matrix for each active user and then performs multi-user precoding. Only in the scheduling phase, the CSI of all users is required, and in the multi-user precoding stage, only the CSI of the active user is required unbe because the total users The number is always much larger than the number of active users, and the scheduling phase is often the cause of excessive feedback overhead.
- long-term statistical CSI in the scheduling phase, specifically, using an average channel matrix instead of the instantaneous channel matrix. Because long-term statistical CSI changes are slower, they can be updated at a lower speed, which can effectively reduce the feedback overhead in the scheduling phase.
- instantaneous CSI is still used.
- the scheduling phase is usually the main source of feedback overhead, and the proposed ideas are effective for reducing feedback.
- a joint multi-user multiple input multiple output (MU-MIMO) precoding and scheduling method comprising the steps of: a multi-user scheduling step performed by using an average channel matrix of each user equipment Multi-user scheduling; and a multi-user precoding step of performing multi-user precoding by using an instantaneous channel matrix of individual user equipment selected in the multi-user scheduling.
- MU-MIMO multiple input multiple output
- the multi-user scheduling step comprises the sub-steps: informing all user equipments to feed back their average channel matrix; receiving an average channel matrix calculated and fed back by all user equipments; and performing the multi-user scheduling by using the fed back average channel matrix , in order to produce optimized scheduling results.
- the optimized scheduling result indicates at least the number of selected/active user equipments, the index of the selected/active user equipment, and the number of data streams of the selected/active user equipment.
- the optimized scheduling results are generated to maximize the throughput of the wireless communication system.
- the optimized scheduling results are generated to maximize the capacity of the wireless communication system.
- the multi-user precoding step comprises the substeps of: notifying all selected/active user equipments of feeding back their instantaneous channel matrix; receiving an instantaneous channel matrix fed back by all selected/active user equipments; a channel matrix, a precoding matrix for each selected/active user equipment; a data vector of each selected/active user equipment is multiplied by its respective precoding matrix to produce a selected/for each a corresponding precoded message of the active user equipment; and transmitting the respective precoded message to each of the selected/active user equipments.
- the instantaneous channel matrix is measured every first time interval ⁇ , and the instantaneous channel matrix measured during the immediately preceding second time interval T L is used, every second time interval T L , the calculation
- the average channel matrix, the first time interval T is at the second time interval T L .
- the second time interval T L is an integer multiple of the first time interval.
- a base station including: a sending unit, configured to send a message to notify a user equipment to feed back an average channel matrix and/or an instantaneous channel matrix; and a receiving unit, configured to receive feedback from the user equipment Average channel matrix and instantaneous channel matrix; multi-user scheduling unit, for use by using each The average channel matrix of the user equipments to perform multi-user scheduling; and a multi-user precoding unit for performing multi-user precoding by using an instantaneous channel matrix of each user equipment selected by the multi-user scheduling unit.
- the multi-user scheduling unit notifies all user equipments to feed back their average channel matrix through the sending unit, receives an average channel matrix calculated and fed back by all user equipments through the receiving unit, and performs by using the fed back average channel matrix.
- the multi-user scheduling is to generate optimized scheduling results.
- the optimized scheduling result indicates at least the number of selected/active user equipments, the index of the selected/active user equipment, and the number of data streams of the selected/active user equipment.
- the multi-user scheduling unit generates the optimized scheduling result to maximize the throughput of the wireless communication system in which the base station is located. Additionally, the multi-user scheduling unit generates the optimized scheduling results to maximize the capacity of the wireless communication system.
- the sending unit is further configured to send precoding data to the user equipment, and the multi-user pre-coding unit notifies, by using the sending unit, all active user equipments selected by the multi-user scheduling unit to feed back Instantaneous channel matrix; receiving, by the receiving unit, an instantaneous channel matrix fed back by all active user equipments; calculating a precoding matrix for each active user equipment based on its instantaneous channel matrix; and data of each active user equipment
- the vectors are multiplied by their respective precoding matrices to generate respective precoded messages for each active user equipment; and the respective precoding messages are transmitted to each active user equipment by the transmitting unit.
- the multi-user precoding unit calculates a multi-user precoding matrix for the active user equipment every first time interval, and the multi-user scheduling unit performs multiple users every second time interval T L Scheduling, wherein the first time interval T is at the second time interval T L . More preferably, the second time interval T L is an integer multiple of the first time interval.
- a user equipment comprising: a receiving unit, configured to receive, from a base station, a message requesting feedback of an instantaneous channel matrix and/or an average channel matrix; an instantaneous channel measuring unit, configured to be used every first Time interval ⁇ [, measuring its instantaneous channel matrix; average channel matrix calculation unit for using the instantaneous channel matrix measured by the instantaneous channel matrix measurement unit during the immediately preceding second time interval T L , every other a second time interval T L , calculating an average channel matrix thereof; and a transmitting unit, configured to send the measured instantaneous channel matrix and/or the calculated average channel matrix to the base station, wherein the first time interval is less than the second time Interval T L .
- the second time interval T L is an integer multiple of the first time interval.
- the invention has the following advantages: 1.
- the present invention greatly reduces the feedback overhead required to combine MU-MIMO and multi-user scheduling systems.
- the present invention greatly simplifies the complexity of scheduling.
- the present invention simplifies terminal operations related to channel estimation and CSI feedback.
- the present invention does not introduce any additional complexity to the BS.
- Figure 1 shows a flow chart of a scheduling phase in accordance with the present invention.
- Figure 2 shows a flow chart of a multi-user precoding stage in accordance with the present invention.
- Figure 3 shows the results of a comparison between the long-term statistical CSI assistance scheme of the present invention and the existing transient CSI assistance scheme based on the MET algorithm and the greedy scheduling strategy.
- FIG. 4 shows a schematic block diagram of a base station 400 for implementing a long term statistical CSI assisted MU-MIMO scheduling method in accordance with the present invention.
- Figure 5 shows a schematic block diagram of a user equipment 500 for implementing a long term statistical CSI assisted MU-MIMO scheduling method in accordance with the present invention.
- N r represents the number of transmitting antennas at the BS
- ⁇ 3 ⁇ 4 represents the number of receiving antennas per user
- N represents the number of active users
- ⁇ represents the channel matrix for the user.
- Step 3 is for the SVD operation to help construct a diagonal equivalent channel matrix for the user.
- the precoding matrix T n is generated above. Complete precoding operations also include data vectors and precoding moments Multiply the array, as shown later.
- dge is the data vector for the length of the user
- 3 ⁇ 4 is Independent identically distributed additive white Gaussian noise (AWGN) vector with zero mean and variance ⁇ 2.
- AWGN additive white Gaussian noise
- ⁇ is the diagonal matrix of x
- the function of the scheduler is to determine which and how many of the AT users will be active, and the number of data streams assigned to each active user. by?
- C(?C) is the throughput that C can achieve; ⁇ Yes with?
- ⁇ / ⁇ 2 is the signal-to-noise-and-interference ratio (SINR) of the sth data stream for the user in K; and /( ⁇ ) is expressed The function of the relationship between SINR and throughput.
- SINR signal-to-noise-and-interference ratio
- MCS modulation coding scheme
- Equation (1) The purpose of equation (1) is to find the optimal one that maximizes the throughput of the system. under these circumstances, If /0 is the Shannon capacity formula, it means finding the best and maximizing the capacity of the system.
- Scheduling phase In this phase, the scheduler uses the average channel matrix instead of the instantaneous channel matrix, according to (1) Multi-user scheduling. Specifically, for each iC, the ⁇ value in (1) is estimated by the following settings, according to the above steps 1-3:
- N N m
- Each user calculates its average channel matrix ⁇ 5 ⁇ by averaging several observations of its physical channel during time period T A .
- the average channel matrix instead of the instantaneous channel matrix, the feedback overhead and scheduling complexity in this phase can be greatly reduced, because the update speed of ⁇ can be much slower than ⁇ H t ⁇ , and only when ⁇ ⁇ ⁇ ⁇ The scheduling operation is performed when it is updated.
- Figure 1 shows a flow chart of a scheduling phase in accordance with the present invention.
- the BS notifies all user equipments to feed back their average channel matrix.
- all user equipments calculate and feed back their average channel matrix.
- the BS performs multi-user scheduling by using the fed back averaged channel matrix to generate an optimized scheduling result, which determines the number of active user equipments N ( , the index of the active user equipment ⁇ Af ⁇ " ⁇ N ⁇ ( l ⁇ k( ) ⁇ m, and the number of data streams of the active user equipment.
- the BS enters the multi-user precoding stage described later.
- Multi-user precoding stage In this stage, the BS generates a precoding matrix for the selected user in accordance with steps 1-3 >.
- Figure 2 shows a flow chart of a multi-user precoding stage in accordance with the present invention.
- the BS notifies the selected user equipment (active user equipment) of its instantaneous channel matrix.
- the selected user equipment feeds back its instantaneous channel matrix.
- the BS calculates a precoding matrix for the selected user equipment based on its instantaneous channel matrix.
- the multi-user precoding operation is repeated every time interval (steps 201-203). It should be noted that since the instantaneous channel matrix changes much faster than the average channel matrix, the instantaneous channel matrix must be updated more frequently, so ⁇ is much smaller than the T L defined above.
- the user should continuously measure its physical channel matrix at intervals of time, whereby an average channel matrix for the duration T L can be generated.
- the time interval T L is an integer multiple of the time interval ⁇ .
- the BS multiplies the data vector of the selected user equipment by its precoding matrix to produce a corresponding precoded message for the selected user equipment. Finally, in step 205, the BS transmits the respective precoded message to each of the selected user devices.
- the proposed long-term statistical CSI assistance scheme is compared with the existing transient CSI assistance scheme.
- the performance of the MET algorithm with a random scheduling policy is also included as a reference, where ⁇ ⁇ active users are randomly selected from K users for each transmission.
- four transmit antennas are used at the base station, two receive antennas per user, and a total of 20 users.
- the average channel matrix for each user is generated by averaging the instantaneous channel matrices over the T consecutive symbols.
- FIG. 4 shows a schematic block diagram of a base station 400 for implementing a long term statistical CSI assisted MU-MIMO scheduling method in accordance with the present invention.
- the base station 400 includes: a sending unit 410, configured to send a message to notify a user equipment to feed back an average channel matrix and/or an instantaneous channel matrix; and a receiving unit 420, configured to receive an average channel matrix and feedback from the user equipment.
- the instantaneous channel matrix of each user equipment performs multi-user precoding.
- the sending unit 410 is further configured to send the pre-coded data to the user equipment.
- the multi-user pre-coding unit 44 0 notifies the all-active user equipment selected by the multi-user scheduling unit 430 to feed back its instantaneous channel matrix through the transmitting unit 410.
- the receiving unit 420 receives the instantaneous channel matrix fed back by all active user equipments. Calculating a precoding matrix for each active user equipment based on its instantaneous channel matrix; multiplying the data vectors of the respective active user equipments with their respective precoding matrices to generate a corresponding for each active user equipment Precoding the message; and transmitting, by the transmitting unit 410, a corresponding precoding message to each active user equipment.
- the multi-user precoding unit 440 calculates a multi-user precoding matrix for the active user equipment at intervals, and the multi-user scheduling unit 430 performs multi-user scheduling at intervals T L .
- the time interval is much smaller than the time interval ⁇ .
- the time interval T L is an integer multiple of the time interval ⁇ .
- Figure 5 shows a schematic block diagram of a user equipment 500 for implementing a long term statistical CSI assisted MU-MIMO scheduling method in accordance with the present invention.
- the user equipment 500 includes a receiving unit 510, an instantaneous channel matrix measuring unit 520, an average channel matrix calculating unit 530, and a transmitting unit 540.
- the receiving unit 510 receives a message from the base station 400 requesting feedback of the instantaneous channel matrix and/or the average channel matrix.
- the instantaneous channel measurement unit 520 measures the instantaneous channel matrix of the user equipment 500 every time interval T.
- the average channel matrix calculation unit 530 calculates the average channel matrix of the user equipment 500 every time interval T L using the instantaneous channel matrix measured by the instantaneous channel matrix measurement unit 520 during the immediately preceding time interval T L .
- the transmitting unit transmits the measured instantaneous channel matrix from the instantaneous channel matrix measurement unit 520 and/or the calculated average channel matrix from the average channel matrix calculation unit 530 to the base station 400.
- the time interval D is much smaller than the time interval T L .
- the time interval T L is an integer multiple of the time interval ⁇ .
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Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010544555A JP5379165B2 (ja) | 2008-01-30 | 2008-01-30 | 長期的csi支援mu−mimoスケジューリング方法、基地局およびユーザ装置 |
KR1020107018935A KR101351289B1 (ko) | 2008-01-30 | 2008-01-30 | 장기 통계 csi 보조 mu―mimo 스케줄링 방법, 기지국 및 이용자 디바이스 |
US12/864,334 US8447339B2 (en) | 2008-01-30 | 2008-01-30 | Long-term-CSI-aided MU-MIMO scheduling method, base station and user equipment |
CN200880123757.2A CN101919172B (zh) | 2008-01-30 | 2008-01-30 | 长期统计csi辅助mu-mimo调度方法、基站和用户设备 |
EP08700757.1A EP2239866B1 (en) | 2008-01-30 | 2008-01-30 | Long-time statistical csi assistant mu-mimo scheduling method, base station and user device |
PCT/CN2008/000238 WO2009100567A1 (zh) | 2008-01-30 | 2008-01-30 | 长期统计csi辅助mu-mimo调度方法、基站和用户设备 |
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PCT/CN2008/000238 WO2009100567A1 (zh) | 2008-01-30 | 2008-01-30 | 长期统计csi辅助mu-mimo调度方法、基站和用户设备 |
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US (1) | US8447339B2 (zh) |
EP (1) | EP2239866B1 (zh) |
JP (1) | JP5379165B2 (zh) |
KR (1) | KR101351289B1 (zh) |
CN (1) | CN101919172B (zh) |
WO (1) | WO2009100567A1 (zh) |
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- 2008-01-30 EP EP08700757.1A patent/EP2239866B1/en active Active
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CN104871464A (zh) * | 2012-12-28 | 2015-08-26 | 株式会社Ntt都科摩 | 无线基站、用户终端、无线通信方法以及无线通信系统 |
Also Published As
Publication number | Publication date |
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KR101351289B1 (ko) | 2014-01-14 |
JP5379165B2 (ja) | 2013-12-25 |
CN101919172B (zh) | 2014-03-26 |
US8447339B2 (en) | 2013-05-21 |
KR20100120291A (ko) | 2010-11-15 |
EP2239866A1 (en) | 2010-10-13 |
US20100304776A1 (en) | 2010-12-02 |
JP2011512076A (ja) | 2011-04-14 |
EP2239866A4 (en) | 2012-10-24 |
EP2239866B1 (en) | 2016-09-21 |
CN101919172A (zh) | 2010-12-15 |
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