CN106788640B - Pairing method for near and far users, terminal equipment and base station equipment - Google Patents
Pairing method for near and far users, terminal equipment and base station equipment Download PDFInfo
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- CN106788640B CN106788640B CN201610260016.5A CN201610260016A CN106788640B CN 106788640 B CN106788640 B CN 106788640B CN 201610260016 A CN201610260016 A CN 201610260016A CN 106788640 B CN106788640 B CN 106788640B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
- H04B7/0486—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking channel rank into account
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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
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0636—Feedback format
- H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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Abstract
The invention provides a pairing method of near and far users, terminal equipment and base station equipment. The method comprises the following steps: a first terminal receives configuration information sent by a base station, wherein the configuration information is used for informing the first terminal of a precoding matrix set allocated to the first terminal by the base station; and calculating and sending optimal channel state information and second channel quality indication to the base station based on the configuration information, wherein the optimal channel state information comprises first channel quality indication, rank indication and precoding matrix indication corresponding to the optimal channel quality, and the second channel quality indication is not larger than the average value of all channel quality indications corresponding to all precoding matrices in the precoding matrix set. The method and the equipment provided by the invention can improve the pairing probability of the near and far users.
Description
Technical Field
The invention relates to the field of communication, in particular to a pairing method of near and far users, terminal equipment and base station equipment.
Background
Non-Orthogonal Multiple Access (NOMA) can achieve higher sum rate compared with OMA, thereby improving system capacity. Downlink non-orthogonal multiple access will be standardized in LTE Release 14, referred to as "multi-user Superposition Transmission" (MUST) in LTE Release 14. The MUST enables different users to use the same resource unit, i.e. Physical Radio Block (PRB) in LTE, at the same time. In NOMA, different users using the same PRB need to be near and far users using the same precoding matrix, and using the same precoding matrix means that the precoding matrices used by the base station for these different users have the same vector. The gain of NOMA comes from the superposition of the constellation diagrams of these near and far users.
The far and near user pair needs to have a certain receiving power difference or geometric signal-to-noise ratio difference, and the larger the receiving power difference is, the larger the gain of the NOMA is. However, in some cases, the probability of the base station finding the far and near user pairs becomes small, resulting in a small gain of NOMA. For example, when the number of concurrent users is small, the cell radius is small, or the number of precoding matrices is large, the number of near and far user pairs using the same precoding matrix is small. In addition, in the prior art, the base station transmits data to the user by using a specific precoding matrix fed back by the user, and since the same precoding matrix needs to be used for transmitting data by far and near users, the same precoding matrix needs to be fed back by far and near users.
Therefore, a new method is needed to improve the matching probability of the near and far users, and the near and far users do not need to feed back the same precoding matrix to the base station.
Disclosure of Invention
The invention solves the problems that: and the pairing probability of the near and far users is improved.
The embodiment of the invention provides a method for pairing near and far users, which comprises the following steps: a first terminal receives configuration information sent by a base station, wherein the configuration information is used for informing the first terminal of a precoding matrix set allocated to the first terminal by the base station; and calculating and sending optimal channel state information and second channel quality indication to the base station based on the configuration information, wherein the optimal channel state information comprises first channel quality indication, rank indication and precoding matrix indication corresponding to the optimal channel quality, and the second channel quality indication is not larger than the average value of all channel quality indications corresponding to all precoding matrices in the precoding matrix set.
Optionally, the method further includes: and receiving data sent by the base station through a first precoding matrix, wherein the first precoding matrix is one of precoding matrices in the precoding matrix set corresponding to the second channel quality indication.
Optionally, at least one column vector of the first precoding matrix is the same as that of the optimal precoding matrix of the second terminal, and the first terminal and the second terminal implement multi-user overlapping transmission.
Optionally, each element in the precoding matrix set includes a beam indication and a precoding matrix corresponding to the beam indication.
Optionally, the second channel quality indicator is a minimum value of all channel quality indicators corresponding to all precoding matrices in the precoding matrix set.
The embodiment of the invention also provides a method for pairing the near and far users, which comprises the following steps: a base station generates configuration information and sends the configuration information to a first terminal, wherein the configuration information is used for informing the first terminal of a precoding matrix set distributed for the first terminal; receiving first optimal channel state information and second channel quality indications sent by the first terminal, wherein the first optimal channel state information comprises a first channel quality indication, a first rank indication and a first precoding matrix indication corresponding to the optimal channel quality, and the second channel quality indication is not greater than the average value of all channel quality indications corresponding to all precoding matrices in the precoding matrix set; and scheduling the first terminal based on the first optimal channel state information or the second channel quality indication, so that the first terminal and the second terminal realize multi-user overlapping transmission.
Optionally, the scheduling the first terminal based on the first optimal channel state information or the second channel quality indication includes: and allocating a first precoding matrix to the first terminal, wherein the first precoding matrix is used for sending data to the first terminal, and the first precoding matrix is one of precoding matrices in the precoding matrix set corresponding to the second channel quality indicator.
Optionally, the method further includes: receiving second optimal channel state information sent by the second terminal, wherein the second optimal channel state information comprises a third channel quality indication, a second rank indication and a second precoding matrix indication which correspond to the second terminal when the channel quality is optimal; allocating a second precoding matrix to the second terminal, the second precoding matrix being determined by a second rank indication and a second precoding matrix indication of the second terminal; and selecting the first precoding matrix from the set of precoding matrices based on the second precoding matrix, wherein at least one column vector of the first precoding matrix is the same as that of the second precoding matrix.
Optionally, each element in the precoding matrix set includes a beam indication and a precoding matrix corresponding to the beam indication.
Optionally, the second channel quality indicator is a minimum value of all channel quality indicators corresponding to all precoding matrices in the precoding matrix set.
An embodiment of the present invention further provides a terminal device, including: a receiving unit, configured to receive configuration information sent by a base station, where the configuration information is used to inform the terminal device of a precoding matrix set allocated to the terminal device by the base station; a calculating unit, configured to calculate optimal channel state information and second channel quality indicator based on the configuration information, where the optimal channel state information includes a first channel quality indicator, a rank indicator, and a precoding matrix indicator corresponding to the optimal channel quality, and the second channel quality indicator is not greater than an average value of all channel quality indicators corresponding to all precoding matrices in the precoding matrix set; and a transmitting unit, configured to transmit the optimal channel state information and the second channel quality indication to the base station.
Optionally, the receiving unit is further configured to receive data sent by the base station through a first precoding matrix, where the first precoding matrix is one of precoding matrices in the precoding matrix set corresponding to the second channel quality indicator.
Optionally, at least one column vector of the first precoding matrix is the same as that of the optimal precoding matrix of the second terminal, and the terminal device and the second terminal implement multi-user overlapping transmission.
Optionally, each element in the precoding matrix set includes a beam indication and a precoding matrix corresponding to the beam indication.
Optionally, the second channel quality indicator is a minimum value of all channel quality indicators corresponding to all precoding matrices in the precoding matrix set.
An embodiment of the present invention further provides a base station device, including: a generating unit, configured to generate configuration information, where the configuration information is used to inform a first terminal of a precoding matrix set allocated to the first terminal; a sending unit, configured to send the configuration information to the first terminal; a receiving unit, configured to receive first optimal channel state information and second channel quality indications sent by the first terminal, where the first optimal channel state information includes a first channel quality indication, a first rank indication, and a first precoding matrix indication corresponding to the optimal channel quality, and the second channel quality indication is not greater than an average value of all channel quality indications corresponding to all precoding matrices in the precoding matrix set; and a scheduling unit, configured to schedule the first terminal based on the first optimal channel state information or the second channel quality indication, so that the first terminal and the second terminal implement multi-user overlapping transmission.
Optionally, the scheduling unit is configured to: and allocating a first precoding matrix to the first terminal, wherein the first precoding matrix is used for sending data to the first terminal, and the first precoding matrix is one of precoding matrices in the precoding matrix set corresponding to the second channel quality indicator.
Optionally, the receiving unit is further configured to receive second optimal channel state information sent by the second terminal, where the second optimal channel state information includes a third channel quality indication, a second rank indication, and a second precoding matrix indication corresponding to the time when the channel quality is optimal, and the scheduling unit is further configured to: allocating a second precoding matrix to the second terminal, wherein the second precoding matrix is used for sending data to the second terminal, and the second precoding matrix is determined by a second rank indication and a second precoding matrix indication of the second terminal; and selecting the first precoding matrix from the set of precoding matrices based on the second precoding matrix, wherein at least one column vector of the first precoding matrix is the same as that of the second precoding matrix.
Optionally, each element in the precoding matrix set includes a beam indication and a precoding matrix corresponding to the beam indication.
Optionally, the second channel quality indicator is equal to a minimum value of all channel quality indicators corresponding to all precoding matrices in the precoding matrix set.
Compared with the prior art, the technical scheme of the invention has the following advantages:
in the method provided by the embodiment of the present invention, the first terminal not only feeds back the optimal channel state information to the base station, but also feeds back a second channel quality indicator, where the second channel quality indicator corresponds to at least one precoding matrix in a set of precoding matrices allocated to the first terminal by the base station. The second channel quality indication is relatively small compared to the optimal channel quality indication. And the base station schedules the first terminal based on the optimal channel state information or the second channel quality indication fed back by the first terminal and combined with the channel state information fed back by other current terminals, so that the first terminal and other terminals realize multi-user overlapping transmission. Compared with the optimal channel state information fed back only based on the terminal in the prior art, the method can improve the pairing probability.
Further, the base station determines that a second terminal is a near-end user, a second precoding matrix allocated to the second terminal for transmitting data is an optimal precoding matrix of the second terminal, then determines a precoding matrix corresponding to the second channel quality indicator in the precoding matrix set of the first terminal, and finds out a first precoding matrix having at least one column vector same as that of the second precoding matrix from the precoding matrices and allocates the first precoding matrix to the first terminal, that is, the first terminal is determined to be a far-end user, so that the first terminal and the second terminal can implement multi-user overlapping transmission.
Drawings
Fig. 1 is a schematic flowchart of a pairing method for near and far users according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a pairing method for near and far users according to another embodiment of the present invention;
fig. 3 is a block diagram of a terminal device according to an embodiment of the present invention; and
fig. 4 is a block diagram of a base station device according to an embodiment of the present invention.
Detailed Description
As mentioned in the background art, the near-far user pairs in the prior art need to feed back the same optimal precoding matrix, and in some cases, the number of the near-far user pairs using the same optimal precoding matrix is small, so the probability of the near-far user pairs is small. The embodiment of the invention provides a novel method for pairing near and far users, so as to improve the pairing probability of the near and far users.
The embodiment of the invention provides a method for pairing near and far users, which comprises the following steps: a terminal receives configuration information sent by a base station, wherein the configuration information is used for informing the terminal of a precoding matrix set allocated to the terminal by the base station; and calculating and sending optimal channel state information and second channel quality indication to the base station based on the configuration information, wherein the optimal channel state information comprises first channel quality indication, rank indication and precoding matrix indication corresponding to the optimal channel quality, and the second channel quality indication is not larger than the average value of all channel quality indications corresponding to all precoding matrices in the precoding matrix set. It can be seen that the terminal not only feeds back the optimal channel state information to the base station, but also feeds back a second channel quality indication related to the precoding matrix set allocated by the base station, and the base station can allocate a precoding matrix used for transmitting data to the terminal according to the second channel quality indication and the precoding matrix set, thereby solving the problem of low matching probability of near and far users caused by the fact that the base station can only allocate the optimal precoding matrix fed back by the base station to the terminal in the prior art.
The embodiment of the invention also provides a method for pairing the near and far users, which comprises the following steps: a base station generates configuration information and sends the configuration information to a first terminal, wherein the configuration information is used for informing the first terminal of a precoding matrix set distributed for the first terminal; receiving first optimal channel state information and second channel quality indications sent by the first terminal, wherein the first optimal channel state information comprises a first channel quality indication, a first rank indication and a first precoding matrix indication corresponding to the optimal channel quality, and the second channel quality indication is not greater than the average value of all channel quality indications corresponding to all precoding matrices in the precoding matrix set; and scheduling the first terminal based on the first optimal channel state information or the second channel quality indication, so that the first terminal and the second terminal realize multi-user overlapping transmission. It can be seen that, the first terminal not only feeds back the optimal channel state information to the base station, but also feeds back a second channel quality indication related to the precoding matrix set allocated by the base station, and the base station can allocate a precoding matrix used for transmitting data to the first terminal based on the two types of messages, thereby solving the problem of low near-far user pairing probability caused by the fact that the base station can only allocate the optimal precoding matrix fed back by the base station to the terminal in the prior art.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for pairing near and far users according to an embodiment of the present invention, and the following detailed steps are described in detail.
As can be understood by those skilled in the art, the so-called near-far user pairing is to implement MUST, where multiple terminals transmit data on the same resource unit, and the base station needs to allocate a precoding matrix to the terminals, and when there is at least one same column vector in the precoding matrices allocated to the multiple terminals, the multiple terminals may implement MUST, that is, a near-far user pair is formed. Generally, a terminal needs to measure a current channel state, and then feeds back related parameters to a base station, and the base station performs scheduling according to the parameters fed back by the terminal.
Step S101, the first terminal receives the configuration information sent by the base station.
Before the first terminal feeds back the relevant information of the channel state, the base station sends configuration information required for feedback to the first terminal.
In some embodiments, the configuration information includes a format and the like that are needed to be used when the first terminal feeds back information to the base station subsequently.
In this embodiment, the configuration information is further used to inform the first terminal of a precoding matrix set allocated to the first terminal by the base station.
Specifically, the base station may allocate a precoding matrix set to the first terminal, where the precoding matrix set is pre-stored in the base station, and elements in the set are candidates of a precoding matrix subsequently allocated to the first terminal for transmitting data. And the base station tells the first terminal the corresponding precoding matrix set through the configuration message.
In specific implementation, the base station allocates a precoding matrix set to each terminal in the cell and informs each terminal what the corresponding precoding matrix set is, which is equivalent to making an agreement between the base station and the terminal.
In some embodiments, each element of the set of precoding matrices is a precoding matrix. In some embodiments, such as hybrid beamforming, each element in the set of precoding matrices comprises a beam indication and its corresponding precoding matrix.
And step S102, calculating and sending optimal CSI and second CQI to the base station based on the configuration information.
In the embodiment of the present invention, the optimal CSI includes a first CQI, an RI, and a PMI corresponding to the optimal channel quality. Those skilled in the art know that the CQI value is the largest when the channel quality is the best, and the precoding matrix determined by the corresponding RI and PMI may be referred to as the best precoding matrix. That is, the optimal CSI is the CSI currently measured by the first terminal and including the maximum CQI, and the maximum CQI is the first CQI.
Unlike the prior art, the terminal calculates a second CQI in addition to the optimal CSI. In some embodiments, the second CQI is not greater than an average of all CQIs corresponding to all precoding matrices in the set of precoding matrices. In some embodiments, the second CQI is a minimum value of all CQIs corresponding to all precoding matrices in the set of precoding matrices.
The smaller value of the second CQI may limit the rank of the precoding matrix to be allocated to the first terminal to a low order, and may also limit the first terminal to low order modulation or a low code rate, and the like.
In a specific implementation, the base station may receive the optimal CSI and the second CQI sent by the multiple terminals, and based on the optimal CSI and the second CQI fed back by the terminals, the base station may allocate a precoding matrix. And the base station integrates the current feedback information of all the terminals, allocates the optimal precoding matrix determined based on the optimal CSI for some terminals, and allocates the optimal precoding matrix determined based on the second CQI for some terminals for other terminals. In this way, a plurality of terminals use the same precoding matrix, and thereby, the MUST is realized.
Based on the CQI in the optimal CSI or the second CQI, the base station may also determine an appropriate coding scheme, a modulation scheme, and the like for the first terminal.
Step S103, receiving data sent by the base station through a first precoding matrix, where the first precoding matrix is one of precoding matrices in the precoding matrix set corresponding to the second CQI.
As described above, the base station may synthesize the information currently fed back by all the terminals to perform scheduling for the terminals. In this embodiment, the base station allocates the optimal precoding matrix to the second terminal (that is, the second terminal is a near-end user), and allocates the first precoding matrix to the first terminal (that is, the first terminal is a far-end user). At least one column vector of the first precoding matrix is the same as that of the optimal precoding matrix of the second terminal, and the first precoding matrix is one of precoding matrices corresponding to the second CQI in the precoding matrix set. In this way, the first terminal and the second terminal implement a MUST.
Since the first precoding matrix is an element in the set of precoding matrices agreed by the base station and the first terminal, and the base station knows the second CQI corresponding to the first precoding matrix, the first terminal can correctly decode the original data when receiving the data transmitted through the first precoding matrix.
In other embodiments, the base station may also allocate its optimal precoding matrix to the first terminal, that is, the first terminal is a near-end user, and other terminals are allocated as far-end users.
Referring to fig. 2, fig. 2 is a flowchart illustrating a method for pairing near and far users according to another embodiment of the present invention, and the following detailed steps are described in detail.
In step S201, the base station generates configuration information and transmits the configuration information to the first terminal.
In some embodiments, the configuration information includes a format and the like that are needed to be used when the first terminal feeds back information to the base station subsequently. In this embodiment, the configuration information is further used to inform the first terminal of a precoding matrix set allocated to the first terminal by the base station.
In some embodiments, each element of the set of precoding matrices is a precoding matrix. In some embodiments, such as hybrid beamforming, each element in the set of precoding matrices comprises a beam indication and its corresponding precoding matrix.
Specifically, the base station may allocate a precoding matrix set to the first terminal, where the precoding matrix set is pre-stored in the base station, and elements in the set are candidates of a precoding matrix subsequently allocated to the first terminal for transmitting data. And the base station tells the first terminal the corresponding precoding matrix set through the configuration message.
In step S202, the first optimal CSI and the second CQI sent by the first terminal are received.
In this embodiment of the present invention, the first optimal CSI includes a first CQI, an RI, and a PMI corresponding to the optimal channel quality. Unlike the prior art, the first terminal feeds back not only its optimal CSI but also a second CQI. In some embodiments, the second CQI is not greater than an average of all CQIs corresponding to all precoding matrices in the set of precoding matrices. In some embodiments, the second CQI is a minimum value of all CQIs corresponding to all precoding matrices in the set of precoding matrices.
The smaller value of the second CQI may limit the rank of the precoding matrix to be allocated to the first terminal to a low order, and may also limit the first terminal to low order modulation or a low code rate, and the like.
Based on the first CQI or the second CQI in the first optimal CSI, the base station may also determine an appropriate coding scheme, a modulation scheme, and the like for the first terminal.
In step S203, the second optimal CSI sent by the second terminal is received.
Similarly, in the embodiment of the present invention, the second optimal CSI includes a third CQI, a second RI, and a second PMI corresponding to the optimal channel quality.
In some embodiments, the base station may also receive a fourth CQI sent by the second terminal, similar to the second CQI for the first terminal. The fourth CQI is not greater than an average value of all CQIs corresponding to all precoding matrices in a set of precoding matrices configured by the base station for the second terminal. For example, the fourth CQI may be a minimum value of all CQIs corresponding to all precoding matrices in a precoding matrix set configured by the base station for the second terminal.
In the above, two terminals are taken as an example to illustrate the method provided by the embodiment of the present invention. It should be noted that, in practical applications, the base station may receive the optimal CSI and an additional CQI sent by more terminals, and combine the optimal CSI and the additional CQI fed back by the terminals, and the base station may allocate precoding matrices, where some terminals are allocated with optimal precoding matrices determined based on the optimal CSI of some terminals, and some terminals are allocated with optimal precoding matrices determined based on the additional CQI of some terminals. In this way, a plurality of terminals use the same precoding matrix, and thereby, the MUST is realized.
In step S204, scheduling is performed for the first terminal and the second terminal based on the information sent by the first terminal and the second terminal.
In a specific implementation, the base station first determines a near-end user, that is, an optimal precoding matrix fed back by a certain terminal is allocated to the terminal to transmit data. Then, based on this, all precoding matrices corresponding to the additional CQIs fed back by the other terminals are selected from a set of precoding matrices corresponding to the other terminals, and then a precoding matrix having a common column vector with the optimal precoding matrix of the near-end user is found from the selected precoding matrices. For example, the optimal precoding matrix of the near end user is [ c1, c2], and the selected precoding matrices are [ c1] and [ c3 ]. Since [ c1] and [ c1, c2] have a common column vector, the base station can use [ c1, c2] to transmit data, and not only the near-end user can receive data, but also the other terminals can receive data transmitted on [ c1] code stream. The other terminal here becomes the far end user, and the near end user and the far end user implement the MUST.
In some embodiments, the base station allocates, in combination with currently received feedback information, a second precoding matrix to the second terminal, where the second precoding matrix is an optimal precoding matrix of the second terminal, that is, a precoding matrix determined by a second RI and a second PMI corresponding to the second terminal when channel quality fed back by the second terminal is optimal. Then, the base station selects all precoding matrixes corresponding to a second CQI fed back by the first terminal from the precoding matrix set configured for the first terminal, and then finds out a first precoding matrix having a common column vector with the optimal precoding matrix of the second terminal from the selected precoding matrixes. In this way, the base station may transmit data to the first terminal and the second terminal using the second precoding matrix, and the second terminal and the first terminal may implement the MUST only if the first terminal receives the data on the code stream corresponding to the first precoding matrix. As will be understood by those skilled in the art, the references to "transmitting data to a second terminal using a second precoding matrix" and "transmitting data to a first terminal using a first precoding matrix" in this document actually refer to "transmitting data to a first terminal and a second terminal using a second precoding matrix, where the first terminal receives data on a code stream corresponding to the first precoding matrix".
In a specific implementation, the first precoding matrix comprises the second precoding matrix. In some embodiments, the rank of the second precoding matrix is greater than the rank of the first precoding matrix.
The technical solution of the present invention is described below by a specific example in order to better understand the above embodiments.
The base station configures information such as formats used for feeding back optimal CSI and additional CQI to the terminal UE1, and informs the terminal UE1 of a corresponding precoding matrix set through the configuration information.
After receiving the configuration sent by the base station, the terminal UE1 calculates the optimal CSI and the additional CQI, and feeds back the CSI and the additional CQI to the base station. In fact, terminal UE1 and the base station have already agreed, after receiving the feedback information, the base station may select a suitable modulation and coding format for terminal UE1 according to the additional CQI, and select a suitable precoding matrix from the set of precoding matrices corresponding to terminal UE1 based on the additional CQI to transmit to terminal UE1, so that terminal UE1 may decode correctly.
It is understood that not only terminal UE1 does this, but all terminals in the cell follow the above procedure, i.e., the base station receives feedback information from multiple terminals. And the base station carries out scheduling according to the optimal CSI fed back by all the terminals and the additional CQI.
For example, the optimal precoding matrix corresponding to the RI and the PMI included in the optimal CSI fed back by the terminal UE2 is M1 ═ v1, v2], CQI ═ 910 ], the additional CQI fed back by the terminal UE1 is 1, the precoding matrix set configured by the terminal UE1 is a, and if the precoding matrix set a includes [ v1] or [ v2], the base station may decide to transmit data using the optimal precoding matrix M1 of the terminal UE2, so that not only the terminal UE2 may receive related data, but also the terminal UE1 may receive data on a v1 or v2 code stream in M1. That is, the base station schedules terminal UE2 in v1 and v2 layers as a near-end user, and schedules terminal UE1 in v1 layer or v2 layer as a far-end user, thereby implementing MUST.
In the above embodiment, two terminals are taken as an example for explanation, however, the present invention is not limited to this, and in practical application, more terminals may exist.
The above embodiments are applicable to the case of Cell-specific Reference signals (CRS), the case of non-precoded Channel state information-Reference signals (CSI-RS), or the case where the optimal CSI and the additional CQI in beamforming can only be transmitted within the same beam.
For the case where the optimal CSI and the additional CQI are sent within different beams in beamforming, the following method may be employed. Unlike the foregoing embodiments, each element in the precoding matrix set CA configured by the base station for the terminal UE1 includes a beam indicator and its corresponding precoding matrix. For example, the optimal precoding matrix corresponding to the RI and PMI included in the optimal CSI fed back by the terminal UE2 is M1 ═ b1v1, b1v2], CQI ═ 910 ], the additional CQI fed back by the terminal UE1 is 1, the precoding matrix set configured by the terminal UE1 is CA, and if [ b1v1] or [ b1v2] is included in the precoding matrix set CA, the base station may decide to transmit data using the optimal precoding matrix M1 of the terminal UE2, so that not only the terminal UE2 may receive related data, but also the terminal UE1 may receive data on a b1v1 or b1v2 code stream in M1. That is, the base station schedules terminal UE2 in b1v1 and b1v2 layers as near-end users, and schedules terminal UE1 in b1v1 layer or b1v2 layer as far-end users, thereby implementing MUST.
It should be noted that the additional CQI in the above two specific embodiments is the second CQI of the first terminal described in the foregoing embodiments.
Correspondingly, an embodiment of the invention also provides the terminal equipment. Referring to fig. 3, the first terminal device 300 includes: a receiving unit 301, configured to receive configuration information sent by a base station, where the configuration information is used to inform the first terminal device 300 of a precoding matrix set allocated by the base station to the first terminal device; a calculating unit 302, configured to calculate optimal CSI and a second CQI based on the configuration information, where the optimal CSI includes a first CQI, an RI, and a PMI corresponding to the optimal channel quality, and the second CQI is not greater than an average value of all channel quality indications corresponding to all precoding matrices in the precoding matrix set; and a transmitting unit 303, configured to transmit the optimal CSI and the second CQI to the base station.
In some embodiments, the configuration information includes a format and the like that are needed to be used when the first terminal device 300 feeds back information to the base station. In some embodiments, each element of the set of precoding matrices is a precoding matrix. In some embodiments, such as hybrid beamforming, each element in the set of precoding matrices comprises a beam indication and its corresponding precoding matrix.
In some embodiments, the second CQI is a minimum value of all channel quality indicators corresponding to all precoding matrices in the set of precoding matrices. The smaller value of the second CQI may limit the rank of the precoding matrix to be allocated to the first terminal device 300 to a lower order, and may also limit the first terminal device 300 to a lower order modulation or a lower code rate, etc.
Based on the CQI in the optimal CSI or the second CQI, the base station may also determine a suitable coding scheme, a modulation scheme, and the like for the first terminal device 300.
In some embodiments, the receiving unit 301 is further configured to receive data sent by the base station through a first precoding matrix, where the first precoding matrix is one of precoding matrices in the set of precoding matrices corresponding to the second CQI.
In some embodiments, the first precoding matrix is the same as the optimal precoding matrix of the second terminal device with at least one column vector, and the first terminal device 300 and the second terminal device implement a MUST.
In specific implementation, the base station may synthesize information currently fed back by all the terminal devices to schedule the terminal devices. In this embodiment, the base station allocates the optimal precoding matrix to the second terminal device (that is, the second terminal device is a near-end user), and allocates the first precoding matrix to the first terminal device 300 (that is, the first terminal device 300 is a far-end user). At least one column vector of the first precoding matrix is the same as that of the optimal precoding matrix of the second terminal equipment, and the first precoding matrix is one of precoding matrices corresponding to the second CQI in the precoding matrix set. In this way, the first terminal device 300 and the second terminal device implement MUST.
In some embodiments, the receiving unit 301 and the transmitting unit 303 may be wireless transceiving devices; the computing unit 302 may be a processor, such as a CPU, MCU, DSP, etc.
An embodiment of the present invention provides a base station device. Referring to fig. 4, the base station apparatus 400 includes: a generating unit 401, configured to generate configuration information, where the configuration information is used to inform a first terminal of a set of precoding matrices allocated to the first terminal; a sending unit 402, configured to send the configuration information to the first terminal; a receiving unit 403, configured to receive a first optimal CSI and a second CQI sent by the first terminal, where the first optimal CSI includes a first CQI, a first RI, and a first PMI that correspond to the best channel quality, and the second CQI is not greater than an average value of all channel quality indications corresponding to all precoding matrices in the precoding matrix set; and a scheduling unit 404, configured to schedule the first terminal based on the first optimal CSI or the second CQI, so that the first terminal and the second terminal implement a MUST.
In some embodiments, the configuration information includes a format and the like that are needed to be used when the first terminal feeds back information to the base station apparatus 400 subsequently.
In some embodiments, each element of the set of precoding matrices is a precoding matrix. In some embodiments, such as hybrid beamforming, each element in the set of precoding matrices comprises a beam indication and its corresponding precoding matrix.
In some embodiments, the second CQI is equal to a minimum value of all channel quality indicators corresponding to all precoding matrices in the set of precoding matrices.
In some embodiments, the scheduling unit 404 is configured to: allocating a first precoding matrix to the first terminal, where the first precoding matrix is used to send data to the first terminal, and the first precoding matrix is one of precoding matrices in the set of precoding matrices corresponding to the second CQI.
In some embodiments, the receiving unit 403 is further configured to receive second optimal CSI sent by the second terminal, where the second optimal CSI includes a third CQI, a second RI, and a second PMI corresponding to the best channel quality, and the scheduling unit 404 is further configured to: allocating a second precoding matrix to the second terminal, where the second precoding matrix is used to send data to the second terminal, and the second precoding matrix is determined by a second RI and a second PMI of the second terminal; and selecting the first precoding matrix from the set of precoding matrices based on the second precoding matrix, wherein at least one column vector of the first precoding matrix is the same as that of the second precoding matrix.
In some embodiments, the receiving unit 403 is further configured to receive a fourth CQI sent by the second terminal. The fourth CQI is not greater than an average value of all CQIs corresponding to all precoding matrices in a set of precoding matrices configured by the base station for the second terminal. For example, the fourth CQI may be a minimum value of all CQIs corresponding to all precoding matrices in a precoding matrix set configured by the base station for the second terminal.
It should be noted that, in practical applications, the base station apparatus 400 may receive the optimal CSI and an additional CQI sent by more terminals, and combine the optimal CSI and the additional CQI fed back by the terminals, and the base station apparatus 400 may allocate precoding matrices, where some terminals are allocated with the optimal precoding matrices determined based on the optimal CSI thereof, and some terminals are allocated with the optimal precoding matrices determined based on the additional CQI thereof. In this way, a plurality of terminals use the same precoding matrix, and thereby, the MUST is realized.
The base station device 400 allocates a second precoding matrix to the second terminal device in combination with the currently received feedback information, where the second precoding matrix is an optimal precoding matrix of the second terminal device, that is, a precoding matrix determined by a second RI and a second PMI corresponding to the second terminal device when the channel quality fed back by the second terminal device is optimal. Then, the base station device 400 selects all precoding matrices corresponding to the second CQI fed back by the first terminal device from the set of precoding matrices configured for the first terminal device, and then finds a first precoding matrix having a common column vector with the optimal precoding matrix of the second terminal device from the selected precoding matrices. In this way, the base station device 400 may transmit data to the first terminal device and the second terminal device by using the second precoding matrix, and the second terminal device and the first terminal device may implement the MUST only if the first terminal device receives the data on the code stream corresponding to the first precoding matrix.
In some embodiments, the transmitting unit 402 and the receiving unit 403 may be wireless transceiving devices; the generating unit 401 and the scheduling unit 404 may be processors, such as CPUs, MCUs, DSPs, and the like.
To sum up, in the method and the apparatus provided in the embodiments of the present invention, the first terminal not only feeds back the optimal channel state information to the base station, but also feeds back a second channel quality indicator, where the second channel quality indicator corresponds to at least one precoding matrix in a set of precoding matrices allocated by the base station to the first terminal. The second channel quality indication is relatively small compared to the optimal channel quality indication. And the base station schedules the first terminal based on the optimal channel state information or the second channel quality indication fed back by the first terminal and combined with the channel state information fed back by other current terminals, so that the first terminal and other terminals realize multi-user overlapping transmission. Compared with the optimal channel state information fed back only based on the terminal in the prior art, the method can improve the pairing probability.
Further, the base station determines that a second terminal is a near-end user, a second precoding matrix allocated to the second terminal for transmitting data is an optimal precoding matrix of the second terminal, then determines a precoding matrix corresponding to the second channel quality indicator in the precoding matrix set of the first terminal, and finds out a first precoding matrix having at least one column vector same as that of the second precoding matrix from the precoding matrices and allocates the first precoding matrix to the first terminal, that is, the first terminal is determined to be a far-end user, so that the first terminal and the second terminal can implement multi-user overlapping transmission.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (12)
1. A method for pairing near and far users, comprising:
a first terminal receives configuration information sent by a base station, wherein the configuration information is used for informing the first terminal of a precoding matrix set allocated to the first terminal by the base station;
the first terminal calculates and sends optimal channel state information and second channel quality indications to the base station based on the configuration information, wherein the optimal channel state information comprises a first channel quality indication, a rank indication and a precoding matrix indication which correspond to the optimal channel quality, and the second channel quality indication is not larger than the average value of all channel quality indications corresponding to all precoding matrixes in the precoding matrix set; and
the first terminal receives data sent by the base station through a first precoding matrix, the first precoding matrix is one of precoding matrices in the precoding matrix set corresponding to the second channel quality indication, at least one column vector of the first precoding matrix is the same as that of an optimal precoding matrix of a second terminal, and the first terminal and the second terminal realize multi-user overlapping transmission.
2. The method of claim 1, wherein each element in the set of precoding matrices comprises a beam indication and its corresponding precoding matrix.
3. The method of claim 1, wherein the second channel quality indication is a minimum of all channel quality indications corresponding to all precoding matrices in the set of precoding matrices.
4. A method for pairing near and far users, comprising:
a base station generates configuration information and sends the configuration information to a first terminal, wherein the configuration information is used for informing the first terminal of a precoding matrix set distributed for the first terminal;
the base station receives first optimal channel state information and second channel quality indications sent by the first terminal, wherein the first optimal channel state information comprises a first channel quality indication, a first rank indication and a first precoding matrix indication which correspond to the optimal channel quality, and the second channel quality indication is not larger than the average value of all channel quality indications corresponding to all precoding matrixes in the precoding matrix set;
the base station receives second optimal channel state information sent by a second terminal, wherein the second optimal channel state information comprises a third channel quality indication, a second rank indication and a second precoding matrix indication which correspond to the optimal channel quality;
the base station allocates a second precoding matrix to the second terminal, wherein the second precoding matrix is determined by a second rank indication and a second precoding matrix indication of the second terminal;
the base station selects a first precoding matrix from the precoding matrix set based on the second precoding matrix, wherein the first precoding matrix is one of precoding matrices in the precoding matrix set corresponding to the second channel quality indication and has at least one column vector same as that of the second precoding matrix; and
the base station allocates the first precoding matrix to the first terminal, and the first precoding matrix is used for sending data to the first terminal, so that the first terminal and the second terminal realize multi-user overlapping transmission.
5. The method of claim 4, wherein each element in the set of precoding matrices comprises a beam indication and its corresponding precoding matrix.
6. The method of claim 4, wherein the second channel quality indication is a minimum of all channel quality indications corresponding to all precoding matrices in the set of precoding matrices.
7. A terminal device, comprising:
a receiving unit, configured to receive configuration information sent by a base station, where the configuration information is used to inform the terminal device of a precoding matrix set allocated to the terminal device by the base station;
a calculating unit, configured to calculate optimal channel state information and second channel quality indicator based on the configuration information, where the optimal channel state information includes a first channel quality indicator, a rank indicator, and a precoding matrix indicator corresponding to the optimal channel quality, and the second channel quality indicator is not greater than an average value of all channel quality indicators corresponding to all precoding matrices in the precoding matrix set; and
a transmitting unit, configured to transmit the optimal channel state information and the second channel quality indication to the base station,
the receiving unit is further configured to receive data sent by the base station through a first precoding matrix, where the first precoding matrix is one of precoding matrices in the precoding matrix set corresponding to the second channel quality indicator, at least one column vector of the first precoding matrix is the same as that of an optimal precoding matrix of a second terminal, and the terminal device and the second terminal implement multi-user overlapping transmission.
8. The terminal device of claim 7, wherein each element in the set of precoding matrices comprises a beam indication and its corresponding precoding matrix.
9. The terminal device of claim 7, wherein the second channel quality indication is a minimum of all channel quality indications corresponding to all precoding matrices in the set of precoding matrices.
10. A base station apparatus, comprising:
a generating unit, configured to generate configuration information, where the configuration information is used to inform a first terminal of a precoding matrix set allocated to the first terminal;
a sending unit, configured to send the configuration information to the first terminal;
a receiving unit, configured to receive first optimal channel state information and second channel quality indications sent by the first terminal, where the first optimal channel state information includes a first channel quality indication, a first rank indication, and a first precoding matrix indication corresponding to the optimal channel quality, and the second channel quality indication is not greater than an average value of all channel quality indications corresponding to all precoding matrices in the precoding matrix set; receiving second optimal channel state information sent by a second terminal, wherein the second optimal channel state information comprises a third channel quality indication, a second rank indication and a second precoding matrix indication which correspond to the optimal channel quality; and
a scheduling unit, configured to allocate a second precoding matrix to the second terminal, where the second precoding matrix is used to send data to the second terminal, and the second precoding matrix is determined by a second rank indication and a second precoding matrix indication of the second terminal; selecting the first precoding matrix from the set of precoding matrices based on the second precoding matrix, wherein the first precoding matrix is one of precoding matrices in the set of precoding matrices corresponding to the second channel quality indicator and has at least one column vector same as that of the second precoding matrix; and allocating the first precoding matrix to the first terminal, wherein the first precoding matrix is used for sending data to the first terminal, so that the first terminal and the second terminal realize multi-user overlapping transmission.
11. The base station device of claim 10, wherein each element in the set of precoding matrices comprises a beam indication and its corresponding precoding matrix.
12. The base station device of claim 10, wherein the second channel quality indication is equal to a minimum of all channel quality indications corresponding to all precoding matrices in the set of precoding matrices.
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