CN106941696B - Interference elimination method and equipment - Google Patents
Interference elimination method and equipment Download PDFInfo
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- CN106941696B CN106941696B CN201610005353.XA CN201610005353A CN106941696B CN 106941696 B CN106941696 B CN 106941696B CN 201610005353 A CN201610005353 A CN 201610005353A CN 106941696 B CN106941696 B CN 106941696B
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Abstract
The invention discloses an interference elimination method and equipment, wherein the method comprises the following steps: when the serving base station judges that the first terminal UE is subjected to the co-channel interference of the second terminal UE2, the serving base station sends an interference request to an interference base station; the above-mentionedThe service base station receives an interference response sent by the interference base station; the service base station acquires a channel matrix H of a channel from the service base station to the UE1(ii) a The service base station is according to the H1The S2And said H2Determining a reconstructed interference signal I2(ii) a The service base station obtains a first transmission signal S0Said S0The matrix of the non-channel originally sent to the UE by the serving base station is H1A faded signal of the channel; the serving base station sends the S0And said I2The difference is sent to the UE as a second transmission signal.
Description
Technical Field
The present invention relates to wireless technologies, and in particular, to an interference cancellation method and apparatus.
Background
Due to the scarcity of spectrum resources, a co-frequency networking mode is often adopted in a Long Term Evolution (LTE) network, that is, multiple cells all adopt the same frequency point, so that spectrum resources can be saved, but the problem is that users at the edge of a cell easily suffer from stronger neighboring cell co-frequency interference I, as shown in fig. 1-1. Interference cancellation is therefore a key technology in LTE systems.
The interference cancellation is divided into two types according to whether the network provides auxiliary information or not, wherein the first type is the self-interference cancellation of the terminal, namely the self-interference suppression and cancellation receiver of the terminal, and the second type is the interference suppression and cancellation of the terminal by utilizing the network assistance, namely the network-assisted interference suppression and cancellation receiver is needed. The interference elimination of the terminal itself means that the terminal estimates and eliminates the interference signal I by itself under the condition that no network auxiliary information is provided, but the interference elimination effect is not good; network-assisted terminal suppression and elimination refers to the fact that a network side provides some auxiliary information related to interference, such as modulation modes and the like, and the terminal reconstructs and eliminates the interference, but the processing difficulty, power consumption and the like of the terminal are increased, and user experience is affected.
The existing interference cancellation schemes need to reconstruct an interference signal at a terminal side and then cancel the interference signal from a received signal to achieve the purpose of canceling the interference, but the reconstruction and cancellation of the interference need a large calculation processing overhead no matter whether based on network auxiliary information or not, which results in increased power consumption and cost of the terminal.
Disclosure of Invention
In view of this, embodiments of the present invention provide an interference cancellation method and apparatus for solving at least one problem in the prior art, which can directly reconstruct and cancel an interference signal on a network side, reduce processing overhead on a terminal side, improve user experience of the terminal, and reduce cost.
The technical scheme of the embodiment of the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides an interference cancellation method, where the method includes:
when the service base station judges that the first terminal UE is interfered by the same frequency of the second terminal UE2, the service base station sends an interference request to an interference base station, wherein the interference request is used for requesting the interference base station to transmit a downlink signal S communicated with the UE22And a channel matrix H of a channel between the interfering base station to the UE2The interfering base station is a base station of a cell to which the UE2 belongs, and the serving base station is a base station of a cell to which the UE belongs;
the service base station receives an interference response sent by the interference base station, wherein the interference response carries the S2And said H2；
The service base station acquires a channel matrix H of a channel from the service base station to the UE1；
The service base station is according to the H1The S2And said H2Determining a reconstructed interference signal I2The reconstructed interference signal I2The reconstructed interference signal of the interference base station to the UE;
the service base station obtains a first transmission signal S0Said S0The matrix of the non-channel originally sent to the UE by the serving base station is H1A faded signal of the channel;
the serving base station sends the S0And said I2The difference is sent to the UE as a second transmission signal S.
In a second aspect, an embodiment of the present invention provides an interference cancellation method, where the method includes:
the first terminal UE obtains the current interference type by measuring the signal to interference plus noise ratio SINR on the allocated resources;
when the interference type is same frequency interference, the UE carries the same frequency interference in an interference feedback message;
the UE sends the interference feedback message to a serving base station;
the UE receives a second transmission signal S transmitted by the serving base station, wherein the second transmission signal S is (S)0-I2)*H1Wherein the S0 is that the non-channel matrix originally sent to the UE by the serving base station is H1Fading signal of the channel, said H1A channel matrix for a channel between the serving base station to the UE, the I2And reconstructing the interference signal of the interference base station to the UE.
In a third aspect, an embodiment of the present invention provides a base station, where the base station includes a first sending unit, a first receiving unit, a first obtaining unit, a determining unit, a second obtaining unit, and a second sending unit, where:
the first sending unit is configured to send an interference request to an interfering base station when it is determined that the first terminal UE is subject to co-channel interference from the second terminal UE2, where the interference request is used to request the interfering base station to send a downlink signal S for communicating with the UE22And a channel matrix H of a channel between the interfering base station to the UE2The interfering base station is the UE2The serving base station is the base station of the cell to which the UE belongs;
the first receiving unit is configured to receive an interference response sent by the interfering base station, where the interference response carries the S2And said H2；
The first obtaining unit is configured to obtain a channel matrix H of a channel from the serving base station to the UE1；
The determination unit is used for determining the H1The S2And said H2Determining a reconstructed interference signal I2The reconstructed interference signal I2The reconstructed interference signal of the interference base station to the UE;
the second obtaining unit is configured to obtain a first sending signal S0, where S0 is H which is an original channel matrix that the serving base station originally sent to the UE and is not used for channel estimation1A faded signal of the channel;
the second sending unit is configured to send the S0 and the I2The difference is sent to the UE as a second transmission signal S.
In a fourth aspect, an embodiment of the present invention provides a terminal, where the terminal includes a measurement unit, a second carrying unit, a third sending unit, and a third receiving unit, where:
the measuring unit is used for obtaining the type of interference currently suffered by measuring the signal to interference plus noise ratio (SINR) on the allocated resources;
the second carrying unit is used for carrying the co-frequency interference in the interference feedback message when the interference type is the co-frequency interference;
the third sending unit is configured to send the interference feedback message to a serving base station;
the third receiving unit is configured to receive a second transmission signal S transmitted by the serving base station, where the second transmission signal S is (S)0-I2)*H1Wherein said S0The matrix of the non-channel originally sent to the UE by the serving base station is H1A signal of fading of a channel, the H1 being a channel matrix of a channel between the serving base station to the UE, the I2And reconstructing the interference signal of the interference base station to the UE.
In the interference elimination method and device provided by the embodiment of the invention, when the serving base station judges that the first terminal UE is interfered by the same frequency of the second terminal UE2, the serving base station sends an interference request to the interference base station; the service base station receives an interference response sent by the interference base station; the service base station acquires the channel moment of the channel between the service base station and the UEMatrix H1(ii) a The service base station is according to the H1The S2And said H2Determining a reconstructed interference signal I2(ii) a The serving base station acquires a first transmission signal S0, where S0 is H, which is an original non-channel matrix sent by the serving base station to the UE1A faded signal of the channel; the serving base station sends the S0And said I2The difference is used as a second sending signal S to be sent to the UE; therefore, the interference signal can be directly reconstructed and eliminated on the network side, the processing overhead on the terminal side is reduced, the user experience of the terminal is improved, and the cost is reduced.
Drawings
FIG. 1-1 is a diagram illustrating co-channel interference in the related art;
fig. 1-2 are schematic diagrams of interference cancellation performed by a network and a terminal in an embodiment of the present invention;
fig. 1-3 are schematic diagrams illustrating a flow chart of an interference cancellation method according to an embodiment of the present invention;
fig. 2-1 is a schematic diagram of joint interference cancellation between a network and a terminal according to a second embodiment of the present invention;
fig. 2-2 is a schematic flow chart of an implementation of a second interference cancellation method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a structure of a third base station according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a three-terminal according to an embodiment of the present invention.
Detailed Description
For simplicity of description, two cells are discussed below as an example, but the scheme is also applicable to a multi-cell scenario. Fig. 1-2 is a schematic diagram of interference cancellation performed by a network and a terminal in combination in an embodiment of the present invention, as shown in fig. 1-2, two cells are considered, where a Cell in which the terminal is located is Cell-1, and a neighboring Cell is Cell-2. And the received signal of the terminal is:
R＝S+I+N (0-1)；
in the formula (0-1), R is a terminal receiving signal, S is a useful signal transmitted by Cell-1 received by the terminal, I is an interference signal of a neighboring Cell-2 received by a terminal UE, and N is ambient thermal noise.
In the existing technical scheme, a terminal estimates and reconstructs the interference of the adjacent cell to obtain I1Thus, canceling the signal yields equation (0-2);
R-I1＝S+(I-I1)+N (0-2)。
as can be seen from equation (0-2), if the neighbor interference reconstruction is accurate, then I ═ I1So that the signal after cancellation is R-I1S + N, i.e. the neighbour interference is cancelled.
In the embodiment of the invention, the interference brought by the Cell-1 to the Cell-2 in the neighboring Cell is directly eliminated, that is, the interference signal brought by the Cell-1 to the Cell-2 is reconstructed by the base station Cell-1 to obtain I2And subtracted in the transmitted signal. The subtracted signals are faded through a channel, and a downlink signal sent by the Cell-1 and received by the terminal is a formula (0-3):
S1＝S-I1(0-3)；
in the formula (0-3), S is a useful signal received by the terminal, I1For the interference received by the terminal, the interference I brought by the adjacent cell will be I and I1And (4) carrying out cancellation, namely the terminal receiving signal R is represented by the formula (0-4):
R＝S1+I+N＝(S-I1)+I+N＝S+(I-I1)+N (0-4)；
as can be seen from equation (0-4), if the interference estimation of Cell-1 to Cell-2 in the neighborhood is accurate, the interference will be completely cancelled, i.e. when I ═ I1And R is S + N, so that the purpose of eliminating the interference of the adjacent region is achieved.
Compare original scheme, this scheme is in the base station side and is directly eliminated the interference, and the advantage includes following aspect: 1) an interface exists between the serving Cell-1 and the neighboring Cell-2, and the neighboring Cell and the serving Cell can interact in real time, so that interference signal reconstruction at the base station side is easier. 2) In order to achieve accurate estimation of interference by a serving cell base station, a terminal can report information required by network interference estimation so as to enhance the interference estimation effect and be more accurate. 3) The base station has strong processing capability, the reconstruction and elimination of the interference at the base station side are easier to realize, and no cost increase is caused to the terminal.
The technical solution of the present invention is further elaborated below with reference to the drawings and the specific embodiments.
Example one
Based on the foregoing embodiments, an interference cancellation method is provided in the embodiments of the present invention, and is applied to a base station, where functions implemented by the method may be implemented by a processor in the base station calling a program code, and certainly, the program code may be stored in a computer storage medium, and it is apparent that the base station includes at least a processor and a storage medium.
Fig. 1-3 are schematic diagrams illustrating a flow of implementing an interference cancellation method according to an embodiment of the present invention, as shown in fig. 1-3, the method includes:
step S101, a first terminal UE obtains the current interference type by measuring the signal to interference plus noise ratio (SINR) on the allocated resources;
step S102, when the interference type is same frequency interference, the UE carries the same frequency interference in an interference feedback message;
here, in an embodiment of the present invention, the method further includes: and when the interference type is the environmental interference, ending the process.
Step S103, the UE sends the interference feedback message to a service base station;
step S104, the service base station receives an interference feedback message sent by the UE, wherein the interference feedback message carries an interference type, and the interference type comprises co-channel interference and environmental interference;
step S105, the service base station judges whether the UE suffers from co-channel interference according to the interference feedback message;
step S106, when the service base station judges that the first terminal UE is interfered by the same frequency of the second terminal UE2, the service base station sends an interference request to the interference base station;
here, in an embodiment of the present invention, the method includes: the service base station acquires the working frequency of the UE; the service base station carries the working frequency in the interference request, and the interference request carrying the working frequency is used for controlling the interference base stationA second terminal UE2 causing interference, and requesting said S2And said H2。
Here, the interference request is used for requesting the downlink signal S of the interfering base station to communicate with the UE22And a channel matrix H of a channel between the interfering base station to the UE2The interfering base station is a base station of a cell to which the UE2 belongs, and the serving base station is a base station of a cell to which the UE belongs;
step S107, the service base station receives an interference response sent by the interference base station;
here, the S is carried in the interference response2And said H2；
Step S108, the service base station obtains the channel matrix H of the channel from the service base station to the UE1；
Step S109, the service base station according to the H1The S2And said H2Determining a reconstructed interference signal I2；
Here, the reconstructed interference signal I2The reconstructed interference signal of the interference base station to the UE;
here, the serving base station is according to the H1The S2And said H2Determining a reconstructed interference signal I2The method comprises the following steps: according to I2＝(S2*H2)/H1Obtaining a heavy interference signal I2。
Step S110, the service base station obtains a first sending signal S0；
Here, the S0The matrix of the non-channel originally sent to the UE by the serving base station is H1A faded signal of the channel;
step S111, the service base station sends the S0And said I2The difference is sent to the UE as a second transmission signal S.
Step S112, the UE receives a second transmission signal S transmitted by the serving base station;
here, the second transmission signal S ═ (S)0-I2)*H1Wherein said S0The matrix of the non-channel originally sent to the UE by the serving base station is H1Fading signal of the channel, said H1A channel matrix for a channel between the serving base station to the UE, the I2And reconstructing the interference signal of the interference base station to the UE.
Example two
An embodiment of the present invention provides an interference cancellation method, and fig. 2-1 is a schematic diagram of joint interference cancellation between a network and a terminal in a third embodiment of the present invention, and for better explanation, first, the symbols and their meanings referred in fig. 2-1 are introduced:
cell-1: a serving cell of the UE;
cell-2: an interfering cell, also the serving cell for UE 2;
UE: a target user;
UE2: users having an interference relationship with the UE;
S0: the service Cell-1 sends down useful signals to the UE, and the signals do not pass through a channel H1(ii) fading;
s: the useful signal transmitted by the serving cell received by the terminal UE, i.e. S ═ S0*H1；
H1: a channel matrix from a Cell-1 base station of a serving Cell to UE;
S2: downlink signals of the interference Cell-2 and the user UE 2;
H2: a channel matrix from interfering Cell-2 to the UE;
i: interference caused to the UE by Cell-2, i.e., I ═ S, is caused by the downlink signal that Cell-2 communicates with UE22*H2；
I2: the interfering Cell-2 sends a signal S to the UE22The sample is sent to a serving Cell-1, and the interference is reconstructed by the Cell-1;
and (3) interactive information: interference Cell-2 judges interference users and estimates channel matrix H2The required information;
I1: interference signal I subtracted by serving Cell-1 and received by UE2Theoretical signal after channel fading, i.e. I1＝I2*H1；
S1: a signal sent by a serving Cell-1 and received by a terminal, wherein the estimated interference signal I is removed at a base station transmitting end2；
Referring to fig. 2-1, the following describes an interference cancellation algorithm proposed in the embodiment of the present invention, which can calculate the received signal R of the terminal according to the formula (3-1):
R＝S1+I+N；
＝(S-I1)+I+N；
＝S+(I-I1)+N；
＝S0*H1+(I-I2*H1)+N；
＝S0*H1+(S2*H2-I2*H1)+N； (3-1)；
therefore, in order to eliminate the interference of the neighboring cell, the above (S) is required to be used2*H2-I2*H1) Minimization of where S2The signal is a known signal sent by Cell-2. Channel condition H1And H2Can be further decomposed into base station antennas HbsRadio space propagation condition HfsTerminal receiving antenna Hue. Thus S2*H2-I2*H1Can be further written as equation (3-2):
S2*H2-I2*H1＝S2*Hbs2*Hfs2*Hue-I2*Hbs1*Hfs1*Hue；
＝(S2*Hbs2*Hfs2-I2*Hbs1*Hfs1)*Hue； (3-2)；
in the formula (3-2), HueDoes not affect the minimization calculation, Hbs1And Hbs2Is the base station antenna is a known condition, Hfs1Can be obtained by the reference signal sent by the UE to Cell-1, so only Cell-2 to Cell-1 need be obtainedDownlink channel matrix H of UEfs2Can reasonably adjust I2Signal will S2*H2-I2*H1Is reduced to 0.
As can be seen from channel reciprocity in a Time Division Duplex (TDD) system, the downlink channel condition from Cell-2 to UE is the same as the uplink channel condition from UE to Cell-2. Therefore, Cell-1 informs Cell-2 of the uplink reference signal related information sent by the UE through the interface between Cell-1 and Cell-2. Cell-2 can demodulate and estimate the channel of the uplink reference signal sent by UE according to the information, thereby obtaining the channel condition from UE to Cell-2, and obtaining Hfs2The channel condition. The adjacent Cell interference suffered by the UE can be eliminated by subtracting the corresponding interference signal I2 from the useful signal issued by the Cell-1. Therefore, the terminal receives the signal R ═ S0*H1+(S2*H2-I2*H1) (S) in + N2*H2-I2*H1) Can be obtained and eliminated to 0, i.e. the co-channel interference is eliminated.
Based on the foregoing fig. 2-1, an embodiment of the present invention provides an interference cancellation method, and fig. 2-2 is a schematic flow chart of an implementation of a three-interference cancellation method according to an embodiment of the present invention, as shown in fig. 2-2, the method includes:
step S201: UE detects the interference of the adjacent Cell and feeds back the Cell-1 base station of the serving Cell;
here, the UE may obtain a current condition of the interference Signal by measuring SINR (Signal to interference plus Noise Ratio) on the allocated resource and power spectrum distribution information of the interference Signal, specifically, when the SINR is lower than a certain threshold, it indicates that the current interference Signal is strongly interfered by the outside, and further determines whether the current interference Signal belongs to co-channel interference or environmental Noise according to the power spectrum distribution information, and when the power spectrum distribution information is a typical frequency band distribution, it determines that the current interference is co-channel interference. And the UE reports the time domain distribution information, the frequency domain distribution information and the interference intensity information of the interference signals to a serving base station Cell-1.
Step S202: the Cell-1 base station and the Cell-2 base station in the adjacent area negotiate and locate an interference source;
here, after receiving the interference condition report of the UE, the Cell-1 base station notifies the time domain distribution information, the frequency domain distribution information, and the strength information of the interference signal to a base station in the neighboring Cell (Cell-2 base station), and the base station in the neighboring Cell can locate the UE2 that causes interference to the Cell-1 through the information. Because the UE detects the same frequency interference, it indicates that there is a user in the neighboring cell to transmit and receive information on the time domain and frequency domain resources. The Cell-2 base station may find the own Cell user UE2 that causes interference to the UE.
Step S203: the Cell-1 base station informs the Cell-2 base station of the relevant information of the UE uplink reference signal demodulation;
here, the related information of the uplink reference signal demodulation of the UE is configured by the Cell-1 base station, and the related information of the uplink reference signal demodulation includes a time-frequency resource, a modulation mode, a coding mode, and the like of the uplink reference signal.
Here, Cell-1 base station estimates uplink channel condition from UE to Cell-1 by using UE uplink reference signal, and Cell-1 acquires downlink channel matrix H according to channel reciprocity1. Cell-2 base station to channel matrix H2The estimation of the UE needs to demodulate the uplink reference signal of the UE, and the Cell-1 informs the Cell-2 base station of relevant information needed by the demodulation of the uplink reference signal, such as time-frequency resources, a modulation mode, a coding mode and the like of the uplink reference signal of the UE through an interface between the Cell-2 and the Cell-1.
Step S204: the Cell-2 base station completes the estimation of the channel condition H2 between the Cell-2 base station and the UE;
here, the Cell-2 base station demodulates the UE uplink reference signal according to the demodulated related information such as the time-frequency resource, the modulation mode, and the coding mode obtained from the Cell-1 base station, and completes the estimation of the channel condition H2.
Step S205: cell-2 base station will channel condition H2And the interference signal sample sent by the Cell-1 base station is notified;
here, the Cell-2 base station will determine the channel condition H2And interference sample notification Cell-1 for Cell-1 to calculate the interference estimation signal I to be subtracted2。
Step S206: cell-1 base station utilizes channel condition H2And interferenceThe signal sample is carried out interference elimination operation to obtain an interference estimation signal I needing to be subtracted2；
Here, Cell-1 is paired with I2Is estimated by comparing (S)2*H2-I2*H1) Minimization, i.e., equal to 0, results. S2*H2-I2*H10, wherein except I2The external information can be obtained, so that the interference estimation signal I can be obtained2。
Step S207: cell-1 base station subtracts interference estimation signal I from its transmission signal2；
Here, Cell-1 sends a useful signal S to the UE0Subtracting the interference signal I calculated in step S2062Then the residual signal S0-I2And sending the information to the UE.
Step S208: and the UE receives the signal sent by the Cell-1 and the interference of the adjacent Cell and completes the elimination of the signal and the interference.
Here, the UE receives the downlink signal S transmitted in step S2070-I2Via channel H1Signal S after decay1＝S-I1Where S is the useful signal S transmitted by the base station0Via channel H1Signals after decay, I1Is interference signal I subtracted by Cell-1 base station terminal2Via channel H1The signal after decay. Thus S1＝S-I1＝S0*H1-I2*H1. The actual received signal R of the terminal obtained by superimposing the signal with the adjacent cell interference signal I is:
R＝S1+I+N
＝S0*H1-I2*H1+I+N
＝S0*H1-I2*H1+S2*H2+N
＝S0*H1+(S2*H2-I2*H1)+N
from step S206, S2*H2-I2*H10, so R is S0*H1+ N, wherein co-channel interference is eliminated. The same frequency is used up to nowAnd (4) interference elimination process.
As can be seen from fig. 2-1 and fig. 2-2, the embodiment of the present invention provides an interference cancellation method, which is actually a network and terminal joint interference cancellation scheme, and the scheme estimates the neighboring cell interference suffered by the terminal at the base station side, reconstructs and cancels the neighboring cell interference by the serving cell, and can reduce the interference cancellation cost of the terminal by performing interference cancellation at the network side. In the embodiment of the invention, the neighbor cell estimates the propagation channel between the neighbor cell and the terminal by adopting a service cell auxiliary mode, namely the service cell informs the neighbor cell of the uplink demodulation related information of the terminal, the neighbor cell estimates the uplink channel from the terminal to the neighbor cell, and the uplink and downlink reciprocity of a TDD system is utilized to achieve the effect of estimating the downlink channel. In the embodiment of the invention, the service cell adopts a neighboring cell auxiliary mode for estimating the neighboring cell interference, namely, after the neighboring cell finishes the downlink channel estimation between the neighboring cell and the terminal, the channel condition and the sent downlink interference signal are informed to the service cell, the service cell estimates the same frequency interference signal of the neighboring cell borne by the terminal by using the information, and directly subtracts the same frequency interference estimation signal from the useful signal sent by the service cell to realize the interference elimination of the terminal side.
EXAMPLE III
Based on the foregoing embodiments, embodiments of the present invention provide a base station, where each unit included in the base station in the embodiments of the present invention may be implemented by a processor in the base station, and certainly may also be implemented by a specific logic circuit; in the course of a particular embodiment, the processor may be a Central Processing Unit (CPU), a Microprocessor (MPU), a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), or the like.
Fig. 3 is a schematic structural diagram of a third base station according to an embodiment of the present invention, and as shown in fig. 3, the base station 300 includes a first sending unit 301, a first receiving unit 302, a first obtaining unit 303, a determining unit 304, a second obtaining unit 305, and a second sending unit 306, where:
the first sending unit 301 is configured to send, when it is determined that a first terminal UE is subject to co-channel interference from a second terminal UE2, an interference request to an interfering base station, where the interference request is used to request a downlink signal S2 for communication between the interfering base station and the UE2 and a channel matrix H2 of a channel from the interfering base station to the UE, the interfering base station is a base station of a cell to which the UE2 belongs, and the serving base station is a base station of a cell to which the UE belongs;
the first receiving unit 302 is configured to receive an interference response sent by the interfering base station, where the interference response carries the S2And said H2；
The first obtaining unit 303 is configured to obtain a channel matrix H of a channel from the serving base station to the UE1；
The determining unit 304 is configured to determine the H according to the H1The S2And said H2Determining a reconstructed interference signal I2The reconstructed interference signal I2The reconstructed interference signal of the interference base station to the UE;
the second obtaining unit 305 is configured to obtain the first transmission signal S0Said S0The matrix of the non-channel originally sent to the UE by the serving base station is H1A faded signal of the channel;
the second sending unit 306 is configured to send the S0And said I2The difference is sent to the UE as a second transmission signal S.
In the embodiment of the invention, the determining unit is used for determining the position according to I2＝(S2*H2)/H1Obtaining a heavy interference signal I2。
In this embodiment of the present invention, the base station further includes a second receiving unit and a determining unit, where:
the second receiving unit is configured to receive an interference feedback message sent by the UE, where the interference feedback message carries an interference type, and the interference type includes co-channel interference and environmental interference;
and the judging unit is used for judging whether the UE suffers from co-channel interference according to the interference feedback message.
In the embodiment of the invention, the base station comprises a third acquisition unit and a carrying unit, wherein the third acquisition unit is used for acquiring the first signal and the second signal
The third obtaining unit is configured to obtain an operating frequency of the UE;
the carrying unit is configured to carry the working frequency in the interference request, where the interference request carrying the working frequency is used to control a second terminal UE2 that causes interference by the interfering base station, and request the S2And said H2。
Here, it should be noted that: the above description of the base station embodiment is similar to the above description of the method embodiment, and has similar beneficial effects to the method embodiment, and therefore, the description is omitted. For technical details that are not disclosed in the embodiments of the base station of the present invention, please refer to the description of the embodiments of the method of the present invention for understanding, and therefore, for brevity, will not be described again.
Example four
Based on the foregoing embodiments, embodiments of the present invention provide a base station, where each unit included in a terminal in an embodiment of the present invention may be implemented by a processor in the base station, and certainly may also be implemented by a specific logic circuit; in the course of a particular embodiment, the processor may be a Central Processing Unit (CPU), a Microprocessor (MPU), a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), or the like.
Fig. 4 is a schematic structural diagram of a three-terminal according to an embodiment of the present invention, and as shown in fig. 4, the terminal 400 includes a measurement unit 401, a second carrying unit 402, a third sending unit 403, and a third receiving unit 404, where:
the measuring unit 401 is configured to obtain a current interference type by measuring a signal to interference plus noise ratio SINR on the allocated resource;
the second carrying unit 402 is configured to carry co-channel interference in an interference feedback message when the interference type is co-channel interference;
the third sending unit 403 is configured to send the interference feedback message to a serving base station;
the third receiving unit 404 is configured to receive a second transmission signal S transmitted by the serving base station, where the second transmission signal S is (S ═ S0-I2)*H1Wherein said S0The matrix of the non-channel originally sent to the UE by the serving base station is H1Fading signal of the channel, said H1A channel matrix for a channel between the serving base station to the UE, the I2And reconstructing the interference signal of the interference base station to the UE.
In this embodiment of the present invention, the terminal further includes an ending unit, configured to end the process when the interference type is the environmental interference.
Here, it should be noted that: the above description of the terminal embodiment is similar to the above description of the method embodiment, and has similar beneficial effects to the method embodiment, and therefore, the description is omitted. For technical details that are not disclosed in the terminal embodiment of the present invention, please refer to the description of the method embodiment of the present invention for understanding, and therefore, for brevity, will not be described again.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention. The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units; can be located in one place or distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all the functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as a removable Memory device, a Read Only Memory (ROM), a magnetic disk, or an optical disk.
Alternatively, the integrated unit of the present invention may be stored in a computer-readable storage medium if it is implemented in the form of a software functional module and sold or used as a separate product. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or a part contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a removable storage device, a ROM, a magnetic or optical disk, or other various media that can store program code.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (12)
1. An interference cancellation method, characterized in that the method comprises:
when the service base station judges that the first terminal UE is interfered by the same frequency of the second terminal UE2, the service base station sends an interference request to an interference base station, wherein the interference request is used for requesting the interference base station to transmit a downlink signal S communicated with the UE22And a channel matrix H of a channel between the interfering base station to the UE2The interfering base station is a base station of a cell to which the UE2 belongs, and the serving base station is a base station of a cell to which the UE belongs;
the service base station receives an interference response sent by the interference base station, wherein the interference response carries the S2And said H2；
The service base station acquires the service base station to the placeThe channel matrix H of the channel between the UEs1；
The service base station is according to the H1The S2And said H2Determining a reconstructed interference signal I2The reconstructed interference signal I2The reconstructed interference signal of the interference base station to the UE;
the service base station obtains a first transmission signal S0Said S0The matrix of the non-channel originally sent to the UE by the serving base station is H1A faded signal of the channel;
the serving base station sends the S0And said I2The difference is sent to the UE as a second transmission signal S.
2. The method of claim 1, wherein the serving base station is based on the H1The S2And said H2Determining a reconstructed interference signal I2The method comprises the following steps:
according to I2＝(S2*H2)/H1Obtaining a heavy interference signal I2。
3. The method of claim 1, further comprising:
the service base station receives an interference feedback message sent by the UE, wherein the interference feedback message carries an interference type, and the interference type comprises co-channel interference and environmental interference;
and the service base station judges whether the UE suffers from co-channel interference or not according to the interference feedback message.
4. The method according to claim 1, characterized in that it comprises:
the service base station acquires the working frequency of the UE;
the serving base station carries the working frequency in the interference request, the interference request carrying the working frequency is used for controlling a second terminal UE2 interfered by the interfering base station, andrequest the S2And said H2。
5. An interference cancellation method, characterized in that the method comprises:
the first terminal UE obtains the current interference type by measuring the signal to interference plus noise ratio SINR on the allocated resources;
when the interference type is same frequency interference, the UE carries the same frequency interference in an interference feedback message;
the UE sends the interference feedback message to a serving base station;
the UE receives a second transmission signal S transmitted by the serving base station, wherein the second transmission signal S is (S)0-I2)*H1Wherein said S0The matrix of the non-channel originally sent to the UE by the serving base station is H1Fading signal of the channel, said H1A channel matrix for a channel between the serving base station to the UE, the I2And reconstructing the interference signal of the interference base station to the UE.
6. The method of claim 5, further comprising:
and when the interference type is the environmental interference, ending the process.
7. A base station, characterized in that the base station comprises a first sending unit, a first receiving unit, a first obtaining unit, a determining unit, a second obtaining unit and a second sending unit, wherein:
the first sending unit is configured to send an interference request to an interfering base station when it is determined that the first terminal UE is subject to co-channel interference from the second terminal UE2, where the interference request is used to request the interfering base station to send a downlink signal S for communicating with the UE22And a channel matrix H of a channel between the interfering base station to the UE2The interfering base station is a base station of a cell to which the UE2 belongs, and the serving base station is a base station of a cell to which the UE belongs;
the first receiving unit is configured to receive an interference response sent by the interfering base station, where the interference response carries the S2And said H2；
The first obtaining unit is configured to obtain a channel matrix H of a channel from the serving base station to the UE1；
The determination unit is used for determining the H1The S2And said H2Determining a reconstructed interference signal I2The reconstructed interference signal I2The reconstructed interference signal of the interference base station to the UE;
the second obtaining unit is used for obtaining the first sending signal S0Said S0The matrix of the non-channel originally sent to the UE by the serving base station is H1A faded signal of the channel;
the second sending unit is used for sending the S0And said I2The difference is sent to the UE as a second transmission signal S.
8. The base station according to claim 7, wherein the determining unit is configured to determine according to I2＝(S2*H2) H1 obtaining heavy interference signal I2。
9. The base station of claim 7, further comprising a second receiving unit and a determining unit, wherein:
the second receiving unit is configured to receive an interference feedback message sent by the UE, where the interference feedback message carries an interference type, and the interference type includes co-channel interference and environmental interference;
and the judging unit is used for judging whether the UE suffers from co-channel interference according to the interference feedback message.
10. Base station according to any of claims 7 to 9, characterized in that the base station comprises a third acquisition unit and a carrying unit, wherein
The third obtaining unit is configured to obtain an operating frequency of the UE;
the carrying unit is configured to carry the working frequency in the interference request, where the interference request carrying the working frequency is used to control a second terminal UE2 that causes interference by the interfering base station, and request the S2And said H2。
11. A terminal is characterized in that the terminal comprises a measuring unit, a second carrying unit, a third sending unit and a third receiving unit, wherein:
the measuring unit is used for obtaining the type of interference currently suffered by measuring the signal to interference plus noise ratio (SINR) on the allocated resources;
the second carrying unit is used for carrying the co-frequency interference in the interference feedback message when the interference type is the co-frequency interference;
the third sending unit is configured to send the interference feedback message to a serving base station;
the third receiving unit is configured to receive a second transmission signal S transmitted by the serving base station, where the second transmission signal S is (S)0-I2)*H1Wherein said S0The matrix of the non-channel originally sent to the UE by the serving base station is H1Fading signal of the channel, said H1A channel matrix for a channel between the serving base station to the UE, the I2And reconstructing the interference signal of the interference base station to the UE.
12. The terminal according to claim 11, wherein the terminal further comprises an ending unit, configured to end the process when the interference type is an environmental interference.
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| KR20070072794A (en) * | 2006-01-02 | 2007-07-05 | 삼성전자주식회사 | Apparatus and method for receiving signal in a communication system |
| JP2007243698A (en) * | 2006-03-09 | 2007-09-20 | Toshiba Corp | Base station, radio terminal, and radio communication method |
| CN101133670A (en) * | 2005-01-26 | 2008-02-27 | 松下电器产业株式会社 | Radio base station device and terminal device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101133670A (en) * | 2005-01-26 | 2008-02-27 | 松下电器产业株式会社 | Radio base station device and terminal device |
| KR20070072794A (en) * | 2006-01-02 | 2007-07-05 | 삼성전자주식회사 | Apparatus and method for receiving signal in a communication system |
| JP2007243698A (en) * | 2006-03-09 | 2007-09-20 | Toshiba Corp | Base station, radio terminal, and radio communication method |
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