CN106941464B - Interference elimination method, base station and user equipment - Google Patents
Interference elimination method, base station and user equipment Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
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- H04L25/03898—Spatial equalizers codebook-based design
- H04L25/03904—Spatial equalizers codebook-based design cooperative design, e.g. exchanging of codebook information between base stations
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- H—ELECTRICITY
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- H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows
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- H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract
The embodiment of the invention provides an interference elimination method, which comprises the following steps: the first base station calculates a first precoding matrix according to the channel response between the first base station and at least one second base station; the first base station receives a second precoding matrix sent by UE, and calculates a third precoding matrix according to the first precoding matrix and the second precoding matrix; and the first base station sends downlink signals to the UE by taking the third precoding matrix as a final precoding matrix. The embodiment of the invention also provides a base station and user equipment.
Description
Technical Field
The present invention relates to communications technologies, and in particular, to a method, a base station, and a user equipment for interference cancellation.
Background
In a Time Division Duplex (TDD) system of Long Term Evolution (LTE), an uplink and a downlink respectively use different subframes, and in order to adapt to different application scenarios, an LTE TDD system may use different uplink and downlink subframe ratios according to service conditions, so as to meet different uplink and downlink asymmetric service requirements. However, in an ultra-dense network, the density of base stations is large, and the number of users served by each small base station is small, so that the ratio of uplink and downlink service loads of each cell changes rapidly, and a dynamic and flexible subframe ratio capable of matching the ratio of the uplink and downlink service loads more quickly and accurately is generally adopted.
In a networking environment, when uplink and downlink transmission directions of adjacent base stations are consistent, User Equipment (UE) located at a cell edge may be interfered by downlink transmission of the adjacent base stations when receiving downlink data of the cell.
At present, an interference Suppression and cancellation (NAICS) technology based on Network cooperation is mainly used for interference cancellation of a neighboring strong interference base station on data received by a user from the base station of the cell, a certain difference between interference strength and signal strength is required, and because the base stations are adjacent to each other, the base stations may be subjected to interference with small difference between strengths of a plurality of neighboring base stations, and for the interference, the performance of NAICS interference cancellation is greatly reduced.
Disclosure of Invention
In view of this, embodiments of the present invention desirably provide an interference cancellation method, a base station, and user equipment, so as to reduce interference of a downlink signal of the base station on an uplink signal of an adjacent base station, and improve a signal-to-noise ratio of the uplink signal of the adjacent base station, thereby improving uplink throughput of the adjacent base station.
The technical scheme of the embodiment of the invention is realized as follows:
a method of interference cancellation, the method comprising:
the first base station calculates a first precoding matrix according to the channel response between at least one second base station per se;
the first base station receives a second precoding matrix sent by UE, and calculates a third precoding matrix according to the first precoding matrix and the second precoding matrix;
and the first base station sends downlink signals to the UE by taking the third precoding matrix as a final precoding matrix.
In the above method, before the calculating the first precoding matrix, the method further includes:
the first base station receives a first pilot signal sent by the at least one second base station, and performs channel measurement according to the first pilot signal to respectively obtain channel responses between the first base station and the at least one second base station; alternatively, the first and second electrodes may be,
the first base station transmitting a second pilot signal to the at least one second base station; receiving a channel measurement result sent by the at least one second base station and obtained by the at least one second base station according to the second pilot signal; and the first base station obtains the channel response between the first base station and the at least one second base station according to the channel measurement result.
In the above method, after the calculating the first precoding matrix, the method further includes:
and the first base station sends the first precoding matrix to the UE through broadcast signaling or UE-dedicated Radio Resource Control (RRC) signaling.
In the above method, before the first base station receives the second precoding matrix sent by the UE, the method further includes:
the first base station sends a third pilot signal to the UE; alternatively, the first and second electrodes may be,
and the first base station uses the first precoding matrix to precode the third pilot signal and sends the precoded third pilot signal to the UE.
In the above method, the third pilot signal includes: channel state reference signals, and/or common reference signals, and/or discovery reference signals, and/or synchronization signals.
In the above method, a period of the first pilot signal or the second pilot signal is greater than a period of the third pilot signal, and/or a frequency domain interval of the first pilot signal or the second pilot signal is greater than a frequency domain interval of the third pilot signal.
In the above method, the receiving, by the first base station, the first pilot signal sent by the at least one second base station includes:
the first base station receives a first pilot signal sent by the at least one second base station when the first base station is in an uplink time slot and the at least one second base station is in a downlink time slot, or the first base station receives the first pilot signal sent by the at least one second base station when the first base station is in a receiving state and the at least one second base station is in a transmitting state, or the first base station sends a second pilot signal to the at least one second base station when the first base station is in a downlink time slot and the at least one second base station is in an uplink time slot, or the first base station sends the second pilot signal to the at least one second base station when the first base station is in a transmitting state and the at least one second base station is in a receiving state.
In the above method, the sending, by the first base station, the downlink signal to the UE by using the third precoding matrix as the final precoding matrix includes:
and the first base station sends downlink signals to the UE based on the third precoding matrix when the at least one second base station is an uplink time slot, or the first base station sends downlink signals to the UE based on the third precoding matrix when the at least one second base station is receiving uplink signals.
In the above method, the first base station uses different third precoding matrices according to the timeslot type or the transceiving state of the at least one second base station.
A method of interference cancellation, the method comprising:
the UE calculates a second precoding matrix according to the channel response between the UE and the first base station;
the UE sends the second precoding matrix to the first base station;
and the UE receives a downlink signal sent by the first base station by taking the third precoding matrix as a final precoding matrix.
In the above method, before the UE calculates the second precoding matrix, the method further includes:
the UE receives a third pilot signal sent by the first base station;
and the UE performs channel measurement according to the third pilot signal to obtain channel response between the UE and the first base station.
In the above method, the method further comprises:
the UE receives a first precoding matrix sent by the first base station;
correspondingly, the UE calculates a second precoding matrix according to a channel response between the UE and the first base station, and further includes:
and the UE calculates the second precoding matrix according to the channel response and the first precoding matrix.
A method of interference cancellation, the method comprising:
the second base station sends a first pilot signal to the first base station; so that the first base station performs channel measurement according to the first pilot signal to obtain a channel response between the first base station and the second base station; alternatively, the first and second electrodes may be,
the second base station receives a second pilot signal sent by the first base station, and performs channel measurement according to the second pilot signal; and sending the channel measurement result to the first base station.
In the above method, the transmitting, by the second base station, the first pilot signal to the first base station includes:
the second base station transmits a first pilot signal to the first base station when the first base station is in an uplink time slot and the second base station is in a downlink time slot, or the second base station transmits a first pilot signal to the first base station when the first base station is in a receiving state and the second base station is in a transmitting state, or the second base station receives a second pilot signal transmitted by the first base station when the first base station is in a downlink time slot and the second base station is in an uplink time slot, or the second base station receives a second pilot signal transmitted by the first base station when the first base station is in a transmitting state and the second base station is in a receiving state.
A base station, the base station comprising:
the first calculation module is used for calculating a first precoding matrix according to the channel response between the first calculation module and at least one second base station;
a first receiving module, configured to receive a second precoding matrix sent by the UE;
the first computing module is further to: calculating a third precoding matrix according to the first precoding matrix and the second precoding matrix;
and a first sending module, configured to send a downlink signal to the UE using the third precoding matrix as a final precoding matrix.
In the above base station, the first receiving module is further configured to: receiving a first pilot signal transmitted by the at least one second base station;
the base station further comprises a measuring module, configured to perform channel measurement according to the first pilot signal, and respectively obtain channel responses between the first base station and the at least one second base station; alternatively, the first and second electrodes may be,
the first sending module is further configured to send a second pilot signal to the at least one second base station;
the first receiving module is further configured to receive a channel measurement result sent by the at least one second base station and obtained by the at least one second base station according to the second pilot signal;
the measurement module is further configured to obtain a channel response between the first base station and the at least one second base station according to the channel measurement result.
In the above base station, the first sending module is further configured to: and sending the first precoding matrix to the UE through broadcast signaling or UE-dedicated Radio Resource Control (RRC) signaling.
In the above base station, the first sending module is further configured to: transmitting a third pilot signal to the UE; or, the third pilot signal is precoded by using the first precoding matrix, and the precoded third pilot signal is sent to the UE.
In the above base station, the third pilot signal includes: channel state reference signals, and/or common reference signals, and/or discovery reference signals, and/or synchronization signals.
In the above base station, a period of the first pilot signal or the second pilot signal is greater than a period of the third pilot signal, and/or a frequency domain interval of the first pilot signal or the second pilot signal is greater than a frequency domain interval of the third pilot signal.
In the above base station, the first sending module is specifically configured to:
the method comprises the steps of receiving a first pilot signal sent by at least one second base station when the first base station is an uplink time slot and the at least one second base station is a downlink time slot, or receiving the first pilot signal sent by the at least one second base station when the first base station is in a receiving state and the at least one second base station is in a sending state, or sending a second pilot signal to the at least one second base station when the first base station is a downlink time slot and the at least one second base station is an uplink time slot, or sending the second pilot signal to the at least one second base station when the first base station is in a sending state and the at least one second base station is in a receiving state.
In the above base station, the first sending module is specifically configured to: and transmitting data to the UE based on the third precoding matrix when the at least one second base station is an uplink timeslot, or transmitting data to the UE based on the third precoding matrix when the at least one second base station is receiving an uplink signal.
In the above base station, the first sending module is specifically configured to adopt different third precoding matrices according to the timeslot type or the transceiving state of the at least one second base station.
A UE, the UE comprising:
the second calculation module calculates a second precoding matrix according to the channel response between the second calculation module and the first base station;
a second sending module, configured to send the second precoding matrix to the first base station;
and the second receiving module is configured to receive a downlink signal sent by the first base station with the third precoding matrix as the final precoding matrix.
In the UE, the second receiving module is further configured to: receiving a third pilot signal sent by the first base station;
the UE further includes a measurement module configured to perform channel measurement according to the third pilot signal to obtain a channel response between the UE and the first base station.
In the UE, the second receiving module is further configured to receive a first precoding matrix sent by the first base station;
correspondingly, the second computing module is further configured to: and calculating the second precoding matrix according to the channel response and the first precoding matrix.
A base station, the base station comprising:
a third sending module, configured to send the first pilot signal to the first base station; so that the first base station performs channel measurement according to the first pilot signal to obtain a channel response between the first base station and the second base station; alternatively, the first and second electrodes may be,
the base station includes: a third receiving module, configured to receive a second pilot signal sent by the first base station, and a measuring module, configured to perform channel measurement according to the second pilot signal;
and a third sending module, configured to send the channel measurement result to the first base station.
In the above base station, the third sending module is specifically configured to:
the method includes the steps of sending a first pilot signal to the first base station when the first base station is in an uplink time slot and the second base station is in a downlink time slot, or sending the first pilot signal to the first base station when the first base station is in a receiving state and the second base station is in a sending state, or receiving a second pilot signal sent by the first base station when the first base station is in the downlink time slot and the second base station is in the uplink time slot, or receiving the second pilot signal sent by the first base station when the first base station is in the sending state and the second base station is in the receiving state.
According to the method for eliminating interference, the base station and the user equipment provided by the embodiment of the invention, the first base station calculates the first precoding matrix according to the channel response between the first base station and at least one second base station; the first base station receives a second precoding matrix sent by UE, and calculates a third precoding matrix according to the first precoding matrix and the second precoding matrix; and the first base station sends downlink signals to the UE by taking the third precoding matrix as a final precoding matrix. It can be seen that, before sending downlink signals, the precoding matrix adopted by the base station is calculated by combining the related information of the surrounding adjacent base stations and the UE; therefore, the interference of the downlink signal of the base station to the uplink signal of the adjacent base station can be reduced from the transmitting end, the signal to noise ratio of the uplink signal of the adjacent base station is improved, and the uplink throughput of the adjacent base station is improved.
Drawings
Fig. 1 is a flowchart of a method for interference cancellation according to an embodiment of the present invention;
fig. 2 is a schematic view of an application scenario of the method for interference cancellation according to the embodiment of the present invention;
fig. 3 is a flowchart of a method for interference cancellation according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a base station according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a UE according to an embodiment of the present invention.
Detailed Description
In each embodiment of the present invention, a method for eliminating uplink and downlink cross slot interference by using channel information feedback is provided, and the method has a basic idea that a first precoding matrix of a first base station and a second base station is calculated according to channel responses of the first base station and the second base station, a second precoding matrix of the first base station and a UE is obtained according to a channel response between the first base station and the UE, a third precoding matrix is calculated by the first base station according to the two precoding matrices, and the first base station uses the third precoding matrix as a final precoding matrix to send downlink signals to the UE; therefore, the interference of the downlink signal of the base station to the uplink signal of the adjacent base station can be reduced from the transmitting end, the signal to noise ratio of the uplink signal of the adjacent base station is improved, and the uplink throughput of the adjacent base station is improved.
Fig. 1 is a flowchart of an interference cancellation method according to an embodiment of the present invention, and as shown in fig. 1, the interference cancellation method according to the embodiment may include:
step 101, the first base station calculates a first precoding matrix according to a channel response between the first base station and at least one second base station.
In particular, the joint channel response obtained by the first base station between itself and the at least one second base station may be expressed as
Obtaining a first precoding matrix P' by applying a Block Diagonalization (BD) algorithm such that
Before this step, when the first base station acquires a channel response between itself and at least one second base station, the first base station may perform any one of the following two ways:
the first base station receives a first pilot signal sent by the at least one second base station, and performs channel measurement according to the first pilot signal to respectively obtain channel responses between the first base station and the at least one second base station; or, the first base station transmits a second pilot signal to the at least one second base station; receiving a channel measurement result sent by the at least one second base station and obtained by the at least one second base station according to the second pilot signal; and the first base station obtains the channel response between the first base station and the at least one second base station according to the channel measurement result.
Specifically, the first base station may obtain channel responses between the first base station and the at least one second base station according to channel reciprocity.
The first pilot signal and the second pilot signal may be any one or more of a discovery reference signal (Disc-RS), a channel state reference signal (CSI-RS), a Common Reference Signal (CRS), and a synchronization signal (PSS/SSS). This embodiment is not particularly limited thereto.
In practical applications, a period of the first pilot signal or the second pilot signal is greater than a period of the third pilot signal, and/or a frequency domain interval of the first pilot signal or the second pilot signal is greater than a frequency domain interval of the third pilot signal.
It should be noted that the first pilot signal and the second pilot signal may be long-periodic and/or sparse in the frequency domain to reduce overhead; the first pilot signals of the plurality of second base stations or the second pilot signals of the plurality of first base stations may be orthogonal in time domain, frequency domain or code domain, and further, interference between the first pilot signals of the plurality of second base stations or the second pilot signals of the plurality of first base stations may be avoided by muting (muting).
The receiving, by the first base station, the first pilot signal sent by the at least one second base station may specifically include: receiving a first pilot signal sent by at least one second base station when the first base station is an uplink time slot and the at least one second base station is a downlink time slot; or, the first base station receives a first pilot signal sent by the at least one second base station when the first base station is in a receiving state and the at least one second base station is in a sending state; or, the first base station sends a second pilot signal to the at least one second base station when the first base station is a downlink timeslot and the at least one second base station is an uplink timeslot; or, the first base station sends a second pilot signal to the at least one second base station when the first base station is in a sending state and the at least one second base station is in a receiving state.
Optionally, after step 101, the first base station may further send the first precoding matrix to the UE through broadcast signaling or UE-specific RRC signaling.
102, the first base station receives a second precoding matrix sent by the UE, and calculates a third precoding matrix according to the first precoding matrix and the second precoding matrix.
Before this step, the first base station transmits a third pilot signal to the UE; or, the first base station uses the first precoding matrix to precode the third pilot signal, and sends the precoded third pilot signal to the UE; wherein the third pilot signal may include a CSI-RS and/or a CRS.
In particular, the third precoding matrix may be equal to a product of the first precoding matrix and the second precoding matrix.
In this step, when the first base station sends a downlink signal to the UE, the first base station may send the downlink signal to the UE based on the third precoding matrix when the at least one second base station is an uplink timeslot, or the first base station may send the downlink signal to the UE based on the third precoding matrix when the at least one second base station is receiving an uplink signal; in practical application, the first base station may adopt a different third precoding matrix according to a timeslot type or a transceiving state of the at least one second base station.
It should be noted that the base station in this embodiment includes, but is not limited to, any of the following: a base station corresponding to a cell, an enhanced base station (eNodeB), a micro base station, a home base station, a Radio Remote Unit (RRU), a Radio Remote Head (RRH), a relay node, and a set made of the above entities.
When the method for interference cancellation provided in this embodiment is applied, specifically, as shown in fig. 2, a UE1 and a UE2 belong to an eNB1 and an eNB2, respectively, and in a certain subframe, the eNB1 is a downlink subframe, and the eNB1 sends downlink data to a UE 1; eNB2 is an uplink subframe, and eNB2 receives uplink data transmitted by UE 2. At this time, the downlink signal transmitted by eNB1 causes interference at eNB2 on the uplink signal transmitted by UE 2.
Assuming that a channel from eNB1 to UE1 is represented as H11, a channel from eNB1 to eNB2 is represented as H12, a channel from eNB2 to UE2 is represented as H22, a downlink signal transmitted by eNB1 to UE1 is P1 × X1, where P1 is a precoding matrix, X1 is a useful signal, an uplink signal transmitted by UE2 to eNB2 is P2 × X2, where P2 is a precoding matrix, and X2 is a useful signal.
The received signal of the UE1 may be expressed as: y1 ═ H11 ═ P1 ═ X1+ N1
The received signal of eNB2 may be represented as: y2 ═ H22 × P2 × 2+ H12 × P1 × X1+ N2
Wherein N1 and N2 are noises respectively.
According to the processing procedures of the above steps 101 to 104, the received signal of the second base station eNB2 may be represented as:
Y2＝H22*P2*X2+H12*P1*X1+N2
＝H22*P2*X2+H12*P’*P1’*X1+N2
＝H22*P2*X2+N2，
wherein H12 × P' ═ 0.
Therefore, the interference cancellation method provided by this embodiment can significantly reduce the interference of the downlink signal sent by the second base station to the received signal of the first base station.
Further, if in practical application, downlink signals of a plurality of first base stations (eNB1, eNB4) cause interference to uplink signals of at least one second base station (eNB2, eNB3), the plurality of first base stations may be virtualized as one first base station to perform joint processing, and a precoding matrix of the downlink signals of the virtualized first base station is finally obtained according to the above steps.
According to the technical scheme of the embodiment, the interference of the downlink signal of the base station to the uplink signal of the adjacent base station can be reduced from the sending end, the signal to noise ratio of the uplink signal of the adjacent base station is improved, and the uplink throughput of the adjacent base station is improved.
Fig. 3 is a flowchart of an interference cancellation method according to a second embodiment of the present invention. As shown in fig. 3, the method provided by this embodiment may include:
Before this step, the UE receives a third pilot signal sent by the first base station; and the UE performs channel measurement according to the third pilot signal to obtain channel response between the UE and the first base station.
It should be noted that, if the UE receives the first precoding matrix sent by the first base station, correspondingly, in this step, the UE needs to calculate the second precoding matrix according to the channel response and the first precoding matrix.
Specifically, the UE may obtain the second precoding matrix by applying a singular value decomposition algorithm to the channel response or to the channel response and the first precoding matrix.
Step 203, the UE receives a downlink signal sent by the first base station with the third precoding matrix as the final precoding matrix.
According to the technical scheme of the embodiment, the interference of the downlink signal of the base station to the uplink signal of the adjacent base station can be reduced from the sending end, the signal to noise ratio of the uplink signal of the adjacent base station is improved, and the uplink throughput of the adjacent base station is improved.
The third embodiment of the invention also provides an interference elimination method. Specifically, the method provided by this embodiment includes:
the second base station sends a first pilot signal to the first base station; so that the first base station performs channel measurement according to the first pilot signal to obtain a channel response between the first base station and the second base station; or, the second base station receives a second pilot signal sent by the first base station, and performs channel measurement according to the second pilot signal; and sending the channel measurement result to the first base station.
Specifically, when the second base station sends a first pilot signal to a first base station, the second base station may send the first pilot signal to the first base station when the first base station is an uplink timeslot and the second base station is a downlink timeslot; alternatively, the second base station may transmit a first pilot signal to the first base station when the first base station is in a receiving state and the second base station is in a transmitting state; or, the second base station may receive a second pilot signal sent by the first base station when the first base station is a downlink timeslot and the second base station is an uplink timeslot; alternatively, the second base station may receive the second pilot signal transmitted by the first base station when the first base station is in a transmission state and the second base station is in a reception state.
And the first base station obtains channel response according to the channel measurement result, calculates to obtain a first pre-coding matrix according to the joint channel response of the plurality of second base stations, calculates to obtain a third pre-coding matrix according to the second pre-coding matrix sent by the UE, and sends downlink signals to the UE by taking the third pre-coding matrix as the pre-coding matrix.
According to the technical scheme of the embodiment, the interference of the downlink signal of the base station to the uplink signal of the adjacent base station can be reduced from the sending end, the signal to noise ratio of the uplink signal of the adjacent base station is improved, and the uplink throughput of the adjacent base station is improved.
Fig. 4 is a schematic structural diagram of a base station according to an embodiment of the present invention. As shown in fig. 4, the base station provided in this embodiment may include: a first calculation module 11, a first receiving module 12 and a first sending module 13.
The first calculation module 11 is configured to calculate a first precoding matrix according to a channel response between the first calculation module and at least one second base station;
a first receiving module 12, configured to receive a second precoding matrix sent by the UE;
the first computing module 11 is further configured to: calculating a third precoding matrix according to the first precoding matrix and the second precoding matrix;
a first sending module 13, configured to send a downlink signal to the UE using the third precoding matrix as a final precoding matrix.
Further, the first receiving module 12 is further configured to: receiving a first pilot signal transmitted by the at least one second base station; the base station further comprises a measuring module, configured to perform channel measurement according to the first pilot signal, and respectively obtain channel responses between the first base station and the at least one second base station; or, the first sending module 13 is further configured to send a second pilot signal to the at least one second base station; the first receiving module 12 is further configured to receive a channel measurement result sent by the at least one second base station and obtained by the at least one second base station according to the second pilot signal; the measurement module is further configured to obtain a channel response between the first base station and the at least one second base station according to the channel measurement result.
Further, the first sending module 13 is further configured to: and sending the first precoding matrix to the UE through broadcast signaling or UE-specific RRC signaling.
The first sending module 13 is further configured to: transmitting a third pilot signal to the UE; or, the third pilot signal is precoded by using the first precoding matrix, and the precoded third pilot signal is sent to the UE. Wherein the third pilot signal comprises: channel state reference signals and/or common reference signals.
Wherein a period of the first pilot signal or the second pilot signal is greater than a period of the third pilot signal, and/or a frequency domain interval of the first pilot signal or the second pilot signal is greater than a frequency domain interval of the third pilot signal.
The first sending module 13 is specifically configured to: the method comprises the steps of receiving a first pilot signal sent by at least one second base station when the first base station is an uplink time slot and the at least one second base station is a downlink time slot, or receiving the first pilot signal sent by the at least one second base station when the first base station is in a receiving state and the at least one second base station is in a sending state, or sending a second pilot signal to the at least one second base station when the first base station is a downlink time slot and the at least one second base station is an uplink time slot, or sending the second pilot signal to the at least one second base station when the first base station is in a sending state and the at least one second base station is in a receiving state.
It should be noted that the first sending module 13 is specifically configured to: and transmitting data to the UE based on the third precoding matrix when the at least one second base station is an uplink timeslot, or transmitting data to the UE based on the third precoding matrix when the at least one second base station is receiving an uplink signal.
The first sending module 13 is specifically configured to adopt different third precoding matrices according to the timeslot type or the transceiving state of the at least one second base station.
The base station provided in this embodiment may be configured to execute the technical solution of the method embodiment shown in fig. 1, and the implementation principle and the technical effect are similar, which are not described herein again.
In practical applications, the first calculating module 11, the first receiving module 12 and the first sending module 13 may be implemented by a Central Processing Unit (CPU), a microprocessor unit (MPU), a Digital Signal Processor (DSP) or a Field Programmable Gate Array (FPGA) on the base station.
Fig. 5 is a schematic structural diagram of a UE according to an embodiment of the present invention. As shown in fig. 5, the UE provided in this embodiment includes: a second calculation module 21, a second sending module 22 and a second receiving module 23.
The second calculating module 21 is configured to calculate a second precoding matrix according to a channel response between the second calculating module and the first base station; a second sending module 22, configured to send the second precoding matrix to the first base station; a second receiving module 23, configured to receive a downlink signal sent by the first base station with the third precoding matrix as a final precoding matrix.
Further, the second receiving module 23 is further configured to: receiving a third pilot signal sent by the first base station; the UE further includes a measurement module configured to perform channel measurement according to the third pilot signal to obtain a channel response between the UE and the first base station.
Further, the second receiving module 23 is further configured to receive a first precoding matrix sent by the first base station; correspondingly, the second calculating module 21 is further configured to: and calculating the second precoding matrix according to the channel response and the first precoding matrix.
The UE provided in this embodiment may be configured to execute the technical solution of the method embodiment shown in fig. 3, and the implementation principle and the technical effect are similar, which are not described herein again.
In practical applications, the second calculating module 21, the second sending module 22 and the second receiving module 23 may be implemented by a CPU, an MPU, a DSP or an FPGA located on the user equipment.
The embodiment of the present invention further provides a base station, and specifically, the base station provided in this embodiment may include:
a third sending module, configured to send the first pilot signal to the first base station; so that the first base station performs channel measurement according to the first pilot signal to obtain a channel response between the first base station and the second base station; or, the base station includes: a third receiving module, configured to receive a second pilot signal sent by the first base station; a measuring module, configured to perform channel measurement according to the second pilot signal; and a third sending module, configured to send the channel measurement result to the first base station.
The third sending module is specifically configured to: the method includes the steps of sending a first pilot signal to the first base station when the first base station is in an uplink time slot and the second base station is in a downlink time slot, or sending the first pilot signal to the first base station when the first base station is in a receiving state and the second base station is in a sending state, or receiving a second pilot signal sent by the first base station when the first base station is in the downlink time slot and the second base station is in the uplink time slot, or receiving the second pilot signal sent by the first base station when the first base station is in the sending state and the second base station is in the receiving state.
The base station provided in this embodiment may be configured to implement the technical solutions of the above method embodiments, and the implementation principles and technical effects are similar, which are not described herein again.
In practical applications, the third sending module, the third receiving module and the measuring module may be implemented by a CPU, an MPU, a DSP or an FPGA located on the base station.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (21)
1. A method of interference cancellation, the method comprising:
the first base station calculates a first precoding matrix according to the channel response between the first base station and at least one second base station;
the first base station receives a second precoding matrix sent by User Equipment (UE), and calculates a third precoding matrix according to the first precoding matrix and the second precoding matrix;
the first base station sends downlink signals to the UE by taking the third precoding matrix as a final precoding matrix; wherein the content of the first and second substances,
the second precoding matrix is calculated by the UE according to the channel response between the UE and the first base station.
2. The method of claim 1, wherein before the computing the first precoding matrix, the method further comprises:
the first base station receives a first pilot signal sent by the at least one second base station, and performs channel measurement according to the first pilot signal to respectively obtain channel responses between the first base station and the at least one second base station; alternatively, the first and second electrodes may be,
the first base station transmitting a second pilot signal to the at least one second base station; receiving a channel measurement result sent by the at least one second base station and obtained by the at least one second base station according to the second pilot signal; and the first base station obtains the channel response between the first base station and the at least one second base station according to the channel measurement result.
3. The method of claim 2, wherein before the first base station receives the second precoding matrix sent by the UE, the method further comprises:
the first base station sends a third pilot signal to the UE; alternatively, the first and second electrodes may be,
and the first base station uses the first precoding matrix to precode the third pilot signal and sends the precoded third pilot signal to the UE.
4. The method of claim 3, wherein the third pilot signal comprises: channel state reference signals, and/or common reference signals, and/or discovery reference signals, and/or synchronization signals.
5. The method according to claim 3, characterized in that the periodicity of the first pilot signal or the second pilot signal is larger than the periodicity of the third pilot signal and/or the frequency domain spacing of the first pilot signal or the second pilot signal is larger than the frequency domain spacing of the third pilot signal.
6. The method of claim 2, wherein the first base station receives a first pilot signal transmitted by the at least one second base station, comprising:
the first base station receives a first pilot signal sent by the at least one second base station when the first base station is in an uplink time slot and the at least one second base station is in a downlink time slot, or the first base station receives the first pilot signal sent by the at least one second base station when the first base station is in a receiving state and the at least one second base station is in a transmitting state, or the first base station sends a second pilot signal to the at least one second base station when the first base station is in a downlink time slot and the at least one second base station is in an uplink time slot, or the first base station sends the second pilot signal to the at least one second base station when the first base station is in a transmitting state and the at least one second base station is in a receiving state.
7. The method of claim 1, wherein the first base station sends the downlink signal to the UE with the third precoding matrix as a final precoding matrix, and wherein the sending comprises:
and the first base station sends downlink signals to the UE based on the third precoding matrix when the at least one second base station is an uplink time slot, or the first base station sends downlink signals to the UE based on the third precoding matrix when the at least one second base station is receiving uplink signals.
8. The method according to claim 1 or 7, wherein the first base station employs a different third precoding matrix according to the slot type or the transceiving state of the at least one second base station.
9. A method of interference cancellation, the method comprising:
the user equipment UE calculates a second precoding matrix according to the channel response between the user equipment UE and the first base station;
the UE sends the second precoding matrix to the first base station;
the UE receives a downlink signal sent by the first base station by taking a third precoding matrix as a final precoding matrix; wherein the content of the first and second substances,
the third precoding matrix is obtained by the first base station through calculation according to the first precoding matrix and the second precoding matrix; the first precoding matrix is calculated by the first base station according to the channel response between the first base station and at least one second base station.
10. The method of claim 9, wherein before the UE calculates the second precoding matrix, the method further comprises:
the UE receives a third pilot signal sent by the first base station;
and the UE performs channel measurement according to the third pilot signal to obtain channel response between the UE and the first base station.
11. The method of claim 10, further comprising:
the UE receives a first precoding matrix sent by the first base station;
correspondingly, the UE calculates a second precoding matrix according to a channel response between the UE and the first base station, and further includes:
and the UE calculates the second precoding matrix according to the channel response and the first precoding matrix.
12. A method of interference cancellation, the method comprising:
the second base station sends a first pilot signal to the first base station; so that the first base station performs channel measurement according to the first pilot signal to obtain a channel response between the first base station and the second base station; alternatively, the first and second electrodes may be,
the second base station receives a second pilot signal sent by the first base station, and performs channel measurement according to the second pilot signal; sending the channel measurement result to the first base station; so that the first base station obtains a channel response between the first base station and the second base station according to the channel measurement result; wherein the content of the first and second substances,
the channel response between the first base station and the second base station is used for the first base station to calculate a first precoding matrix, so that the first base station calculates a third precoding matrix according to the first precoding matrix and a received second precoding matrix sent by the UE; the second precoding matrix is obtained by the UE through calculation according to the channel response between the UE and the first base station; the third precoding matrix is a final precoding matrix used by the first base station for sending downlink signals to the UE.
13. The method of claim 12, wherein the second base station transmits a first pilot signal to the first base station, comprising:
the second base station transmits a first pilot signal to the first base station when the first base station is in an uplink time slot and the second base station is in a downlink time slot, or the second base station transmits a first pilot signal to the first base station when the first base station is in a receiving state and the second base station is in a transmitting state, or the second base station receives a second pilot signal transmitted by the first base station when the first base station is in a downlink time slot and the second base station is in an uplink time slot, or the second base station receives a second pilot signal transmitted by the first base station when the first base station is in a transmitting state and the second base station is in a receiving state.
14. A base station, characterized in that the base station comprises:
the first calculation module is used for calculating a first precoding matrix according to the channel response between the first calculation module and at least one second base station;
a first receiving module, configured to receive a second precoding matrix sent by a user equipment UE;
the first computing module is further to: calculating a third precoding matrix according to the first precoding matrix and the second precoding matrix;
a first sending module, configured to send a downlink signal to the UE using the third precoding matrix as a final precoding matrix; wherein the content of the first and second substances,
the second precoding matrix is calculated by the UE according to the channel response between the UE and the base station.
15. The base station of claim 14, wherein the first receiving module is further configured to: receiving a first pilot signal transmitted by the at least one second base station;
the base station further comprises a measuring module, which is used for carrying out channel measurement according to the first pilot signal and respectively obtaining channel responses between the first base station and the at least one second base station; alternatively, the first and second electrodes may be,
the first sending module is further configured to send a second pilot signal to the at least one second base station;
the first receiving module is further configured to receive a channel measurement result sent by the at least one second base station and obtained by the at least one second base station according to the second pilot signal;
the measurement module is further configured to obtain a channel response between the first base station and the at least one second base station according to the channel measurement result.
16. The base station of claim 14, wherein the first sending module is further configured to: transmitting a third pilot signal to the UE; or, the third pilot signal is precoded by using the first precoding matrix, and the precoded third pilot signal is sent to the UE.
17. The base station of claim 16, wherein the third pilot signal comprises: channel state reference signals, and/or common reference signals, and/or discovery reference signals, and/or synchronization signals.
18. A User Equipment (UE), the UE comprising:
the second calculation module calculates a second precoding matrix according to the channel response between the second calculation module and the first base station;
a second sending module, configured to send the second precoding matrix to the first base station;
a second receiving module, configured to receive a downlink signal sent by the first base station with the third precoding matrix as a final precoding matrix; wherein the content of the first and second substances,
the third precoding matrix is obtained by the first base station through calculation according to the first precoding matrix and the second precoding matrix; the first precoding matrix is calculated by the first base station according to the channel response between the first base station and at least one second base station.
19. The UE of claim 18, wherein the second receiving module is further configured to: receiving a third pilot signal sent by the first base station;
the UE further includes a measurement module configured to perform channel measurement according to the third pilot signal to obtain a channel response between the UE and the first base station.
20. The UE of claim 19, wherein the second receiving module is further configured to receive a first precoding matrix sent by the first base station;
correspondingly, the second computing module is further configured to: and calculating the second precoding matrix according to the channel response and the first precoding matrix.
21. A base station, characterized in that the base station comprises:
a third sending module, configured to send the first pilot signal to the first base station; so that the first base station performs channel measurement according to the first pilot signal to obtain a channel response between the first base station and a second base station; alternatively, the first and second electrodes may be,
the base station includes: a third receiving module, configured to receive a second pilot signal sent by the first base station, and a measuring module, configured to perform channel measurement according to the second pilot signal;
a third sending module, configured to send the channel measurement result to the first base station; so that the first base station obtains a channel response between the first base station and the second base station according to the channel measurement result; wherein the content of the first and second substances,
the channel response between the first base station and the second base station is used for the first base station to calculate a first precoding matrix, so that the first base station calculates a third precoding matrix according to the first precoding matrix and a received second precoding matrix sent by the UE; the second precoding matrix is obtained by the UE through calculation according to the channel response between the UE and the first base station; the third precoding matrix is a final precoding matrix used by the first base station for sending downlink signals to the UE.
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