CN111435858A - Network side equipment and method for interference suppression - Google Patents
Network side equipment and method for interference suppression Download PDFInfo
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- CN111435858A CN111435858A CN201910028387.4A CN201910028387A CN111435858A CN 111435858 A CN111435858 A CN 111435858A CN 201910028387 A CN201910028387 A CN 201910028387A CN 111435858 A CN111435858 A CN 111435858A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2691—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation involving interference determination or cancellation
Abstract
The invention discloses a network side device and an interference suppression method thereof, which are used for solving the problem that no effective symbol backoff mode exists when the interference suppression is carried out at present. In the embodiment of the invention, when the interfered equipment determines to be interfered remotely, the first reference signal RS1 is continuously transmitted, and when the second reference signal RS2 is received, the remote interference is determined not to disappear and uplink symbol backoff is carried out; and the interfering equipment sends a second reference signal RS2 to the interfered party, and starts to carry out downlink symbol backoff when determining that the first reference signal RS1 transmitted by the interfered equipment is received. According to the method, the interference suppression is carried out by alternatively withdrawing the interference parties, the withdrawn symbols are relatively average, and the situation that the cell cannot realize normal communication due to excessive withdrawn symbols on one party can be better avoided.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a network side device and a method for performing interference suppression.
Background
In the process of remote communication, remote interference is generated and other communication equipment is interfered due to the existence of atmospheric waveguide phenomenon. The remote interference of the interfered device is from a plurality of interference source devices at different distances, and the intensity of the interference increases with the decrease of the distance between the two devices. And because the farther the interference source device is from the interfered device, the longer the time delay of the interference source device is, the more symbols of the interfered device link are interfered, and therefore, at the interfered device, the interference thermal noise of the interfered device can present a 'tilt' characteristic, namely, the closer the symbols of the interfered device are to the guard interval, the higher the interference power is. Therefore, communication devices currently face the problem of remote interference.
Disclosure of Invention
The invention provides a network side device and an interference suppression method thereof, which are used for solving the problem of how to avoid remote interference by using a symbol backoff mode when interference is generated in the current communication process.
In a first aspect, a method for performing interference suppression by a network side device according to an embodiment of the present invention includes:
when the remote interference is determined, continuously transmitting a first reference signal RS1, so that an interference device receiving the first reference signal RS1 determines to generate the remote interference and starts to perform downlink symbol backoff; monitoring whether a second reference signal RS2 sent by the interference device is received; and when the second reference signal RS2 is received, determining that the remote interference does not disappear and performing uplink symbol backoff.
In the method, the interfered device continuously transmits the first reference signal RS1, so that the interfering device receiving the first reference signal RS1 determines that remote interference is generated and starts to perform downlink symbol backoff, and determines that the remote interference is not disappeared and performs uplink symbol backoff when receiving the second reference signal RS2, and forms alternate backoff with the interfering device, so that the interfering device and the interfering device suppress interference and simultaneously backoff symbols are balanced, and the situation that normal communication cannot be realized in the cell due to too many backoff symbols in any party can be prevented as much as possible.
In a possible implementation manner, the network side device performs uplink symbol backoff by: back off a fixed number of uplink Orthogonal Frequency Division Multiplexing (OFDM) symbols; or back off the uplink OFDM symbols with the dynamically determined number.
The method provides various modes for determining the backoff symbol, and has stronger adaptability.
In a possible implementation manner, the backoff of the fixed number of uplink orthogonal frequency division multiplexing OFDM symbols includes: and back off one uplink Orthogonal Frequency Division Multiplexing (OFDM) symbol.
The method provides a specific mode for backoff of a fixed number of uplink Orthogonal Frequency Division Multiplexing (OFDM) symbols, one OFDM symbol is backed off every time, the stability is high, and the backed-off symbols between two sides are balanced.
In a possible implementation manner, the back-off dynamically determining the number of uplink OFDM symbols includes: estimating the number of interfered uplink OFDM symbols; and according to the estimated number of the interfered uplink OFDM symbols, back off the uplink OFDM symbols with the dynamically determined number.
According to the method, the accurate number of the OFDM symbols of the remote interference is not required to be determined through the reference signal, only the rough estimation is needed to be carried out on the number of the OFDM symbols of the remote interference, so that the symbol backoff step length is determined, the requirement on the RS can be reduced to the maximum extent, the pressure of RS signal detection is reduced, more severe communication environments can be adapted, the communication resource consumption for remote interference suppression is reduced, the expense of an RIM suppression scheme is reduced, and the adaptability is stronger.
In a second aspect, a method for performing interference suppression by a network side device according to an embodiment of the present invention includes:
when determining that a first reference signal RS1 transmitted by an interfered device is received, starting to carry out downlink symbol backoff; and sending a second reference signal RS2 to the interfered device so that the interfered device determines that the remote interference does not disappear and starts uplink symbol backoff.
In the method, the interfering device sends the second reference signal RS2 to the interfered device, so that the interfered device determines that the remote interference does not disappear and starts uplink symbol backoff, and starts downlink symbol backoff when receiving the first reference signal RS1, and forms alternate backoff with the interfered device, so that the symbols of backoff are balanced while the interference is suppressed by both interfering devices, and the situation that the cell cannot realize normal communication due to too many backoff symbols on either interfering device can be prevented as much as possible.
In a possible implementation manner, the network side device performs downlink symbol backoff in the following manner: back off a fixed number of downlink Orthogonal Frequency Division Multiplexing (OFDM) symbols; or back off the downlink orthogonal frequency division multiplexing OFDM symbols with the dynamically determined number.
The method provides various modes for determining the backoff symbol, and has stronger adaptability.
In a possible implementation manner, the backoff of the fixed number of downlink orthogonal frequency division multiplexing OFDM symbols includes: and back off one downlink orthogonal frequency division multiplexing OFDM symbol.
The method provides a specific mode of backoff of a fixed number of downlink Orthogonal Frequency Division Multiplexing (OFDM) symbols, one OFDM symbol is backed off every time, the stability is strong, and the symbols backed off alternately between the two sides are balanced.
In a possible implementation manner, the back-off dynamically determining the number of downlink orthogonal frequency division multiplexing OFDM symbols includes: estimating the number of downlink OFDM symbols generating interference; and according to the estimated quantity of the downlink OFDM symbols generating the interference, the downlink OFDM symbols of which the quantity is dynamically determined are retreated.
According to the method, the accurate number of the OFDM symbols of the remote interference does not need to be deduced through the reference signal, only the rough estimation is needed to be carried out on the number of the OFDM symbols of the remote interference, so that the symbol backoff step length is determined, the requirement on the RS can be reduced to the maximum extent, the pressure of RS signal detection is reduced, more and worse communication environments can be adapted, the communication resource consumption for remote interference suppression is reduced, the expense of an RIM suppression scheme is reduced, and the adaptability is stronger.
In a possible implementation manner, the estimating the number of downlink OFDM symbols generating interference includes: according to the time position of the received first reference signal RS1, the number of downlink OFDM symbols generating interference is estimated.
The method estimates the number of downlink OFDM symbols generating interference according to the time position of the received first reference signal RS 1.
In a third aspect, an embodiment of the present invention further provides a system for performing interference suppression by a network side device, where the system includes: the interfered device is used for continuously transmitting a first reference signal RS1 when the interfered device is determined to be subjected to remote interference, so that the interfering device receiving the first reference signal RS1 determines to generate remote interference and starts to carry out downlink symbol backoff; monitoring whether a second reference signal RS2 sent by the interference device is received; when receiving a second reference signal RS2, determining that the remote interference does not disappear and performing uplink symbol backoff; the interference equipment is used for starting to carry out downlink symbol backoff when determining that the first reference signal RS1 transmitted by the interfered equipment is received; and sending a second reference signal RS2 to the interfered party so that the interfered party determines that the remote interference does not disappear and starts uplink symbol backoff.
In a fourth aspect, an embodiment of the present invention further provides a network side device for performing interference suppression, where the terminal includes: at least one processing unit and at least one memory unit, wherein the memory unit has stored program code which, when executed by the processing unit, causes the processing unit to perform the functions of the embodiments of the first aspect described above.
In a fifth aspect, an embodiment of the present invention further provides a network side device for performing interference suppression, where the terminal includes: at least one processing unit and at least one memory unit, wherein the memory unit stores program code that, when executed by the processing unit, causes the processing unit to perform the functions of the embodiments of the second aspect described above.
In a sixth aspect, an embodiment of the present invention further provides a network side device for performing interference suppression, where the terminal includes: a determining module, a monitoring module and a processing module, the device having functionality to implement the embodiments of the first aspect described above.
In a seventh aspect, an embodiment of the present invention further provides a network side device for performing interference suppression, where the terminal includes: a processing module and a sending module, the device having functionality to implement the embodiments of the second aspect described above.
In an eighth aspect, the present application further provides a computer storage medium having a computer program stored thereon, which when executed by a processor, performs the steps of the method of the first aspect.
In a ninth aspect, the present application further provides a computer storage medium having a computer program stored thereon, which when executed by a processor, performs the steps of the method of the second aspect.
In addition, for technical effects brought by any one implementation manner in the third aspect to the ninth aspect, reference may be made to technical effects brought by different implementation manners in the first aspect to the second aspect, and details are not described here again.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic diagram of a system for performing interference suppression by a network device according to an embodiment of the present invention;
fig. 2 is a schematic diagram of advanced backoff of an interfered device according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an advanced backoff of an interfering device according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating initial state signal distribution before symbol backoff is performed according to an embodiment of the present invention;
fig. 5 is a schematic diagram of signal distribution after an interfered device first backs off an OFDM symbol according to an embodiment of the present invention;
fig. 6 is a schematic diagram of signal distribution after an interfering device backs off an OFDM symbol according to an embodiment of the present invention;
fig. 7 is a schematic diagram of signal distribution after an interfered device retreats for one OFDM symbol again according to the embodiment of the present invention;
fig. 8 is a schematic diagram of signal distribution after an interfered device dynamically backs off an OFDM symbol according to an embodiment of the present invention;
fig. 9 is a schematic diagram of signal distribution after an interfering device dynamically backs off an OFDM symbol according to an embodiment of the present invention;
fig. 10 is a flowchart illustrating a method for interference suppression by a network device according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a first network-side device for performing interference suppression according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a second network-side device for performing interference suppression according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a third network-side device for performing interference suppression according to an embodiment of the present invention;
fig. 14 is a schematic structural diagram of a fourth network-side device for performing interference suppression according to the embodiment of the present invention;
fig. 15 is a schematic diagram illustrating a method for interference suppression by an interfered device according to an embodiment of the present invention;
fig. 16 is a schematic diagram of a method for interference suppression by an interfering device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Some of the words that appear in the text are explained below:
(1) in the embodiments of the present application, the term "plurality" means two or more, and other terms are similar thereto.
(2) The "RS (Reference Signal)" referred to in the embodiments of the present invention refers to a "pilot" Signal, which is a known Signal provided by the transmitting end to the receiving end for channel estimation or channel detection.
(3) The OFDM (Orthogonal Frequency division multiplexing ) referred in the embodiments of the present invention is one of implementation manners of a multi-carrier transmission scheme, and modulation and demodulation thereof are implemented based on IFFT and FFT, respectively, and is a multi-carrier transmission scheme with the lowest implementation complexity and the widest application.
(4) The "Interference over Thermal" referred to in the embodiments of the present invention refers to a relative value describing an Interference rise in a communication system, and the unit is dB.
As shown in fig. 1, an embodiment of the present invention provides a system for performing interference suppression by a network device, where the system includes:
the interfered device 100 is configured to continuously transmit the first reference signal RS1 when determining that the interference device is subjected to remote interference, so that the interfering device receiving the first reference signal RS1 determines that remote interference is generated and starts to perform downlink symbol backoff; monitoring whether a second reference signal RS2 sent by the interference device is received; when receiving a second reference signal RS2, determining that the remote interference does not disappear and performing uplink symbol backoff;
the interfering device 101 is configured to start downlink symbol backoff when determining that the first reference signal RS1 transmitted by the interfered device is received; and sending a second reference signal RS2 to the interfered party so that the interfered party determines that the remote interference does not disappear and starts uplink symbol backoff.
In the embodiment of the invention, when the interfered device receives the second reference signal RS2, the interfered device determines that the remote interference does not disappear and performs uplink symbol backoff, and when the interfering device receives the first reference signal RS1 transmitted by the interfered device, the interfering device starts to perform downlink symbol backoff to form alternate backoff, so that the symbols of backoff are relatively average while the interference of both interference parties is suppressed, and the situation that the cell cannot realize normal communication due to too many backoff symbols of either party can be prevented as far as possible.
When interference suppression is performed by the method, the interfered device and the interfering device may perform symbol backoff alternately to suppress interference, where the backoff may be divided into multiple cases according to different orders of backoff performed by the interfered device and the interfering device, which are described below.
As an optional implementation, the interfered device first performs uplink symbol backoff, and as shown in fig. 2, the specific interaction procedure includes the following steps:
step 1, the interfered equipment monitors that remote interference exists through an IoT (Internet of things) inclination phenomenon;
step 2, the interfered equipment performs local interference suppression in an uplink symbol backoff mode before the remote interference disappears, and step 3 is executed;
step 3, the interfered device continuously sends a first reference signal RS1 to the interfering device;
step 4, if the interference equipment receives the RS1, the interference equipment determines that remote interference is generated on the interfered equipment;
step 5, the interference equipment performs local interference suppression in a downlink symbol backoff mode before the remote interference disappears, and step 6 is executed;
step 6, the interference equipment continuously sends RS2 to the interfered equipment;
and 7, if the interfered equipment receives the RS2, determining that the remote interference does not disappear, and when the interfered equipment does not detect the RS2 within a period of time, determining that the remote interference disappears and stopping sending the RS 1.
And 8, when the interference equipment does not detect the RS1 within a period of time, determining that the remote interference disappears, and stopping transmitting the RS 2.
In this embodiment, before remote interference disappears, interference suppression is performed on interfering devices and interfered devices in a symbol backoff manner, and the interfered devices perform uplink symbol backoff first and achieve the effect of remote interference suppression by using interactive symbol backoff.
As another alternative, the interfering device performs downlink symbol backoff first. As shown in fig. 3, a specific interaction flow includes the following steps:
step 1, the interfered equipment monitors that remote interference exists through an IoT (Internet of things) inclination phenomenon;
step 2, the interfered device continuously sends a first reference signal RS1 to the interfering device;
step 3, if the interference equipment receives the RS1, the interference equipment determines that remote interference is generated on the interfered equipment;
step 4, the interference equipment performs local interference suppression in a downlink symbol backoff mode before the remote interference disappears, and step 5 is executed;
step 5, the interference equipment continuously sends RS2 to the interfered equipment;
step 6, if the interfered device receives the RS2, the interfered device determines that the interfered party generates remote interference;
and 7, the interfered equipment performs local interference suppression by adopting an uplink symbol backoff mode before the remote interference disappears.
Step 8, when the interfered equipment does not detect RS2 within a period of time, determining that the remote interference disappears, and stopping sending RS 1;
and 9, when the interference equipment does not detect the RS1 within a period of time, determining that the remote interference disappears, and stopping transmitting the RS 2.
In this embodiment, when remote interference disappears, both the interfering device and the interfered device perform interference suppression in a symbol backoff manner, and the interfering device performs downlink symbol backoff first and performs an effect of remote interference suppression in an interactive symbol backoff manner.
As an optional implementation manner, when performing symbol backoff in this embodiment, the number of symbols for performing symbol backoff may be determined in different manners, and specifically, but not limited to, the following determination manner may be used.
Determination method 1: a fixed number of OFDM symbols are backed off.
Specifically, for an interfered device, when the interfered device performs symbol backoff, a fixed number of uplink Orthogonal Frequency Division Multiplexing (OFDM) symbols are backed off; for an interfering device, when the interfering device performs symbol backoff, a fixed number of downlink Orthogonal Frequency Division Multiplexing (OFDM) symbols are backed off. The fixed number employed by the interfering device and the interfered device may be the same or different. The fixed number may be configured to the interfering device or the interfered device in a pre-configured manner, or may be determined in other manners.
Further, when the interfered device performs symbol backoff, backoff is performed on an uplink Orthogonal Frequency Division Multiplexing (OFDM) symbol; and when the interference equipment carries out symbol backoff, backoff a downlink Orthogonal Frequency Division Multiplexing (OFDM) symbol.
By adopting the backoff mode that the interference equipment or the interfered equipment backs off one OFDM at a time, the communication quality can be prevented from being influenced or the backoff symbols of the two parties are unbalanced due to too many symbols in one backoff, the stability is better, and the backoff number of the two parties is more balanced after interactive backoff.
The following describes a process in which an interfering device and an interfered device adopt one OFDM symbol for backoff every time, and as shown in fig. 4, the process is a schematic diagram of signal distribution before symbol backoff is performed, where 3 downlink OFDM symbols of the interfering device generate remote interference on 3 uplink OFDM symbols of the interfered device, the interfered device preferentially performs symbol backoff and when one uplink OFDM symbol is backed off every time, the interfered device monitors that the device receives remote interference, one uplink OFDM symbol is backed off to obtain the signal distribution diagram shown in fig. 5, and at this time, 2 downlink OFDM symbols of the interfering device generate remote interference on the uplink OFDM symbols of the interfered device; since the interfered device continuously sends RS1 to the interfering device after symbol backoff, after receiving RS1, the interfering device determines that remote interference exists, and then backs off a downlink OFDM symbol to obtain a signal distribution diagram shown in fig. 6, where a downlink OFDM symbol of the interfering device generates remote interference on an uplink OFDM of the interfered device; since the interfering device continuously sends RS2 to the interfered device after symbol backoff, after receiving RS2, the interfered device determines that remote interference exists, and the interfered device continuously backs off 1 uplink OFDM symbol to obtain a signal distribution diagram shown in fig. 7, at this time, the remote interference between the interfering device and the interfered device disappears, the symbol backoff is completed, and the remote interference suppression is finished.
Determination mode 2: backoff a dynamically determined number of OFDM symbols.
Specifically, for the interfered device, when symbol backoff is performed, a dynamically determined number of uplink Orthogonal Frequency Division Multiplexing (OFDM) symbols are backed off; and for the interference equipment, when symbol backoff is carried out, dynamically determining the number of downlink Orthogonal Frequency Division Multiplexing (OFDM) symbols by backoff.
The manner of dynamically determining the backoff OFDM symbol number may be, but is not limited to, the following manner:
dynamic determination mode 1: in dynamically determining the number of OFDM symbols to be backed off, since the back-off symbol may be a process performed a plurality of times, the back-off OFDM symbols may be dynamically determined in a varying manner with the number of back-off symbols being successively reduced.
Specifically, when the remote interference is monitored by the interfered equipment, the number of interfered uplink OFDM symbols is estimated; and according to the estimated number of interfered uplink OFDM symbols, carrying out uplink OFDM symbol backoff by adopting the gradually reduced backoff symbol number. For an interference device, when a reference signal RS1 is received, estimating the number of interfered downlink OFDM symbols; and according to the estimated number of interfered downlink OFDM symbols, carrying out downlink OFDM symbol backoff by adopting the gradually reduced backoff symbol number.
Specifically, when symbol backoff is currently performed, a mode of selecting half of the previous backoff symbol may be used.
Assuming that the number of initial symbol backoff symbols of the interfered device is 4 OFDM symbols, when the interfered device needs to perform symbol backoff after performing symbol backoff and the interfered device needs to perform symbol backoff, the number of backoff symbols is reduced by half, and the number of symbols for performing symbol backoff at this time is 2.
It should be noted that, when the backoff symbol number is one OFDM symbol, the backoff symbol number is not continuously reduced when symbol backoff is performed next time. When the backoff symbol number obtained by reducing the backoff symbol number by half is not an integer, the corresponding backoff symbol number may be obtained by rounding up or down, for example, the previous backoff symbol number is 5, after the backoff symbol number is reduced by half, the backoff symbol number is 2.5, at this time, a value obtained by rounding up or rounding down 2.5 is selected as the backoff symbol number, that is, the backoff symbol number is 3 or 2.
Specifically, when symbol backoff is currently performed, the previous backoff symbol number may be reduced by one.
Assuming that the number of symbols to be backed off when the interfered device initially performs symbol backoff is 4 OFDM symbols, when the interfered device needs to perform symbol backoff after performing symbol backoff and the interfered device needs to perform symbol backoff, subtracting one from the number of symbols to be backed off last time, and then the number of symbols to be backed off when performing symbol backoff at present is 3.
It should be noted that, when the backoff symbol number is one OFDM symbol, the backoff symbol number is not continuously reduced when symbol backoff is performed next time.
Dynamic determination mode 2: for the interfered equipment, the number of interfered uplink OFDM symbols needs to be estimated when symbol backoff is carried out each time; determining the quantity of uplink OFDM symbols for backoff according to the estimated quantity of interfered uplink OFDM symbols;
for an interference device, the number of interfered uplink OFDM symbols needs to be estimated when symbol backoff is carried out each time; and determining the quantity of the downlink OFDM symbols for backoff at this time according to the estimated quantity of the interfered downlink OFDM symbols. Specifically, the number of symbols to be backoff when symbol backoff is performed this time may be determined as N according to the following formula:
wherein M is the estimated number of interfered uplink OFDM symbols.
Supposing that when the interfered equipment monitors remote interference, the number of the estimated interfered uplink OFDM symbols is M1Determining the number N of symbols to be backed off at this time by using the formula1When the interfered device backs off N1After one uplink OFDM symbol, if the RS2 sent by the interfering device is still received, the interfered device estimates the number of interfered uplink OFDM symbols to be M again2Determining the backoff step as N according to the formula 12。
According to the method, in the process of remote interference suppression, whether remote interference exists is only needed to be judged, symbol backoff can be carried out by predicting the number of interfered OFDM symbols, the design requirement on a reference signal RS can be reduced to the maximum extent, the pressure of RS signal detection is reduced, and therefore the method can be suitable for more and worse communication environments.
A signal suppression process corresponding to the dynamic determination method 2 is described below with reference to the accompanying drawings, and as shown in fig. 4, a signal distribution schematic diagram before symbol backoff is performed is shown, where 3 downlink OFDM symbols of an interfering device generate remote interference on 3 uplink OFDM symbols of an interfered device, when a method for symbol backoff by the interfered device preferentially is adopted, the number of the uplink OFDM symbols subjected to interference is estimated to be 3, the number of the OFDM symbols to be backoff at this time is determined to be 2 by using the above formula, and then 2 uplink OFDM symbols are backed off to obtain a signal distribution diagram shown in fig. 8, where 1 downlink OFDM symbol of the interfering device generates remote interference on the uplink OFDM symbol of the interfered device at this time; since the interfered device continuously sends RS1 to the interfering device after symbol backoff, the interfering device estimates the number of interfered uplink OFDM symbols to be 1 after receiving RS1, determines the number of OFDM symbols to be 1 for the backoff by using the above formula, and then backs off 1 uplink OFDM symbol to obtain the signal distribution diagram shown in fig. 9, at this time, the remote interference between the interfering device and the interfered device disappears, so that symbol backoff is completed, and remote interference suppression is completed.
By dynamically determining the number of backoff symbols, a more stable effect can be achieved in a shorter time period, and the influence on the correctly transmitted OFDM is reduced.
As an optional implementation manner, in the embodiment of the present invention, after determining the number of backoff symbols and performing symbol backoff, if the symbol backoff is too large, the interfering device or the interfered device may further perform symbol recovery without generating remote interference.
Specifically, when it is determined that remote interference has been suppressed after symbol backoff is performed on the interfered device or the interfering device, it is further determined whether the number of symbols to be backed off last is 1, if so, it may be determined that symbol backoff is finished, and if not, the interfered device or the interfering device may perform symbol recovery in any one of the following manners:
recovering the OFDM symbols of the last backoff, reducing the number of the symbols of the last backoff by half to obtain the number of the symbols of the backoff, performing symbol backoff by using the determined number of the symbols, and continuously judging whether remote interference disappears or not after the symbol backoff is completed; alternatively, the first and second electrodes may be,
and reducing the number of the symbols which are retreated for the last time by half to obtain the number of the symbols which are recovered at this time, recovering the symbols by utilizing the determined number of the symbols, and continuously judging whether the remote interference disappears after the recovery of the symbols is finished.
It should be noted that the above-listed modes are only examples, and specifically, which mode can be set by the user. In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The following describes a scenario selected by the method for interference suppression according to the present invention with reference to the drawings of the specification.
As shown in fig. 10, a method for performing interference suppression by a network device according to an embodiment of the present invention specifically includes the following steps:
the number of backoff symbols may be determined according to one of the above methods for determining backoff symbols of the present invention, for example, backoff a fixed number of OFDM symbols, or select a dynamic backoff symbol in case that the number of OFDM symbols subjected to remote interference can be estimated.
the number of backoff symbols may be determined according to one of the above methods for determining backoff symbols of the present invention, for example, backoff a fixed number of OFDM symbols, or select a dynamic backoff symbol in case that the number of OFDM symbols subjected to remote interference can be estimated.
It should be noted that in the above description of the method for suppressing interference, since the interfered device continuously transmits RS1 and the interfering device also continuously transmits RS2, the interfering device determines whether to receive RS1 and the interfered device determines whether to receive RS2 simultaneously.
In some possible embodiments, aspects of a method for interference suppression by a network side device according to an embodiment of the present invention may also be implemented in the form of a program product, which includes program code for causing a computer device to perform the steps in the method for interference suppression by a network side device according to various exemplary embodiments of the present invention described in this specification when the program code runs on the computer device.
The program product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
According to the program product for interference suppression of the network side equipment, the portable compact disc read only memory (CD-ROM) can be adopted, the program code is included, and the program product can be operated on the server equipment. However, the program product of the present invention is not limited thereto, and in this document, the readable storage medium may be any tangible medium containing or storing the program, which can be used by or in connection with an information transmission, apparatus, or device.
A readable signal medium may include a propagated data signal with readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A readable signal medium may also be any readable medium other than a readable storage medium that can transmit, propagate, or transport the program for use by or in connection with the periodic network action system, apparatus, or device.
Program code embodied on a readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Program code for carrying out operations of the present invention may be written in any combination of one or more programming languages, including AN object oriented programming language such as Java, C + +, or the like, as well as conventional procedural programming languages, such as the "C" language or similar programming languages.
As shown in fig. 11, an embodiment of the present invention provides a network side device for performing interference suppression, where the network side device includes: at least one processing unit 1100 and at least one storage unit 1101, wherein the storage unit 1101 stores program code that, when executed by the processing unit 1100, causes the processing unit 1100 to perform the following:
when the remote interference is determined, continuously transmitting a first reference signal RS1, so that an interference device receiving the first reference signal RS1 determines to generate the remote interference and starts to perform downlink symbol backoff;
monitoring whether a second reference signal RS2 sent by the interference device is received;
and when the second reference signal RS2 is received, determining that the remote interference does not disappear and performing uplink symbol backoff.
Optionally, the processing unit 1100 is specifically configured to:
back off a fixed number of uplink Orthogonal Frequency Division Multiplexing (OFDM) symbols; or the like, or, alternatively,
and back off the uplink orthogonal frequency division multiplexing OFDM symbols with the dynamically determined number.
Optionally, the processing unit 1100 is specifically configured to:
estimating the number of interfered uplink OFDM symbols;
and according to the estimated number of the interfered uplink OFDM symbols, back off the uplink OFDM symbols with the dynamically determined number.
As shown in fig. 12, a network side device for performing interference suppression according to an embodiment of the present invention includes a determining module 1200, a monitoring module 1201, and a processing module 1202:
the determination module 1200: the method is used for continuously transmitting a first reference signal RS1 when the remote interference is determined, so that an interference device receiving the first reference signal RS1 determines to generate the remote interference and starts to perform downlink symbol backoff;
the monitoring module 1201: monitoring whether a second reference signal RS2 sent by the interference device is received;
the processing module 1202: and the uplink symbol backoff module is used for determining that the remote interference does not disappear and performing uplink symbol backoff when receiving the second reference signal RS 2.
Optionally, the processing module 1202 is specifically configured to:
back off a fixed number of uplink Orthogonal Frequency Division Multiplexing (OFDM) symbols; or the like, or, alternatively,
and back off the uplink orthogonal frequency division multiplexing OFDM symbols with the dynamically determined number.
Optionally, the processing module 1202 is specifically configured to:
estimating the number of interfered uplink OFDM symbols;
and according to the estimated number of the interfered uplink OFDM symbols, back off the uplink OFDM symbols with the dynamically determined number.
As shown in fig. 13, an embodiment of the present invention provides a network side device for performing interference suppression, where the network side device includes: at least one processing unit 1300 and at least one memory unit 1301, wherein the memory unit 1301 stores program code, which when executed by the processing unit 1300, causes the processing unit 1300 to perform the following:
when determining that a first reference signal RS1 transmitted by an interfered device is received, starting to carry out downlink symbol backoff; and sending a second reference signal RS2 to the interfered device so that the interfered device determines that the remote interference does not disappear and starts uplink symbol backoff.
Optionally, the processing unit 1300 is specifically configured to:
back off a fixed number of downlink Orthogonal Frequency Division Multiplexing (OFDM) symbols; or the like, or, alternatively,
and back off the downlink orthogonal frequency division multiplexing OFDM symbols with the dynamically determined number.
Optionally, the processing unit 1300 is specifically configured to:
estimating the number of downlink OFDM symbols generating interference;
and according to the estimated quantity of the downlink OFDM symbols generating the interference, the downlink OFDM symbols of which the quantity is dynamically determined are retreated.
Optionally, the processing unit 1300 is specifically configured to:
according to the time position of the received first reference signal RS1, the number of downlink OFDM symbols generating interference is estimated.
As shown in fig. 14, a network side device for performing interference suppression according to an embodiment of the present invention includes a determining module 1400 and a processing module 1401:
the determination module 1400: the method comprises the steps of starting to carry out downlink symbol backoff when a first reference signal RS1 transmitted by an interfered device is determined to be received;
the processing module 1401: and the ue is configured to send a second reference signal RS2 to the interfered device, so that the interfered device determines that remote interference does not disappear and starts uplink symbol backoff.
Optionally, the processing module 1401 is specifically configured to:
back off a fixed number of downlink Orthogonal Frequency Division Multiplexing (OFDM) symbols; or the like, or, alternatively,
and back off the downlink orthogonal frequency division multiplexing OFDM symbols with the dynamically determined number.
Optionally, the processing module 1401 is specifically configured to:
estimating the number of downlink OFDM symbols generating interference;
and according to the estimated quantity of the downlink OFDM symbols generating the interference, the downlink OFDM symbols of which the quantity is dynamically determined are retreated.
Optionally, the processing module 1401 is specifically configured to:
according to the time position of the received first reference signal RS1, the number of downlink OFDM symbols generating interference is estimated.
An embodiment of the present invention further provides a computer-readable non-volatile storage medium, which includes a program code, and when the program code runs on a computing device, the program code is configured to enable the computing device to execute the steps of the method for interference suppression according to the embodiment of the present invention.
Based on the same inventive concept, the embodiment of the present invention further provides a method for interference suppression by a network side device, because the device corresponding to the method is the network side device for interference measurement in the embodiment of the present invention, and the principle of the method for solving the problem is similar to that of the device, the implementation of the method can refer to the implementation of the system, and repeated details are not repeated.
As shown in fig. 15, a method for performing interference suppression by a network device according to an embodiment of the present invention specifically includes the following steps:
Optionally, the network side device performs uplink symbol backoff in the following manner:
back off a fixed number of uplink Orthogonal Frequency Division Multiplexing (OFDM) symbols; or the like, or, alternatively,
and back off the uplink orthogonal frequency division multiplexing OFDM symbols with the dynamically determined number.
Optionally, the backoff fixed number of uplink OFDM symbols includes:
and back off one uplink Orthogonal Frequency Division Multiplexing (OFDM) symbol.
Optionally, the backoff dynamically determines the number of uplink OFDM symbols, which includes:
estimating the number of interfered uplink OFDM symbols;
and according to the estimated number of the interfered uplink OFDM symbols, back off the uplink OFDM symbols with the dynamically determined number.
Based on the same inventive concept, the embodiment of the present invention further provides a method for interference suppression by a network side device, because the device corresponding to the method is the network side device for interference measurement in the embodiment of the present invention, and the principle of the method for solving the problem is similar to that of the device, the implementation of the method can refer to the implementation of the system, and repeated details are not repeated.
As shown in fig. 16, an embodiment of the present invention further provides a method for interference suppression by a network device, where the method includes:
Optionally, the network side device performs downlink symbol backoff in the following manner:
back off a fixed number of downlink Orthogonal Frequency Division Multiplexing (OFDM) symbols; or the like, or, alternatively,
and back off the downlink orthogonal frequency division multiplexing OFDM symbols with the dynamically determined number.
Optionally, the backoff fixed number of downlink OFDM symbols includes:
and back off one downlink orthogonal frequency division multiplexing OFDM symbol.
Optionally, the backoff dynamically determines the number of downlink OFDM symbols, which includes:
estimating the number of downlink OFDM symbols generating interference;
and according to the estimated quantity of the downlink OFDM symbols generating the interference, the downlink OFDM symbols of which the quantity is dynamically determined are retreated.
Optionally, the estimating the number of downlink OFDM symbols generating interference includes:
according to the time position of the received first reference signal RS1, the number of downlink OFDM symbols generating interference is estimated.
The present application is described above with reference to block diagrams and/or flowchart illustrations of methods, apparatus (systems) and/or computer program products according to embodiments of the application. It will be understood that one block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, 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, and/or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer and/or other programmable data processing apparatus, create means for implementing the functions/acts specified in the block diagrams and/or flowchart block or blocks.
Accordingly, the subject application may also be embodied in hardware and/or in software (including firmware, resident software, micro-code, etc.). Furthermore, the present application may take the form of a computer program product on a computer-usable or computer-readable storage medium having computer-usable or computer-readable program code embodied in the medium for use by or in connection with an instruction execution system. In the context of this application, a computer-usable or computer-readable medium may be any medium that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for interference suppression by a network side device is characterized in that the method comprises the following steps:
when the remote interference is determined, continuously transmitting a first reference signal RS1, so that an interference device receiving the first reference signal RS1 determines to generate the remote interference and starts to perform downlink symbol backoff;
monitoring whether a second reference signal RS2 sent by the interference device is received;
and when the second reference signal RS2 is received, determining that the remote interference does not disappear and performing uplink symbol backoff.
2. The method of claim 1, wherein the performing, by the network side device, uplink symbol backoff comprises:
back off a fixed number of uplink Orthogonal Frequency Division Multiplexing (OFDM) symbols; or
And back off the uplink orthogonal frequency division multiplexing OFDM symbols with the dynamically determined number.
3. The method of claim 2, wherein the back-off dynamically determining a number of uplink orthogonal frequency division multiplexing, OFDM, symbols comprises:
estimating the number of interfered uplink OFDM symbols;
and according to the estimated number of the interfered uplink OFDM symbols, back off the uplink OFDM symbols with the dynamically determined number.
4. A method for interference suppression by a network side device is characterized in that,
when determining that a first reference signal RS1 transmitted by an interfered device is received, starting to carry out downlink symbol backoff;
and sending a second reference signal RS2 to the interfered device so that the interfered device determines that the remote interference does not disappear and starts uplink symbol backoff.
5. The method of claim 4, wherein the network side device performs downlink symbol backoff, comprising:
back off a fixed number of downlink Orthogonal Frequency Division Multiplexing (OFDM) symbols; or
And back off the downlink orthogonal frequency division multiplexing OFDM symbols with the dynamically determined number.
6. The method of claim 5, wherein the back-off dynamically determining a number of downlink Orthogonal Frequency Division Multiplexing (OFDM) symbols comprises:
estimating the number of downlink OFDM symbols generating interference;
and according to the estimated quantity of the downlink OFDM symbols generating the interference, the downlink OFDM symbols of which the quantity is dynamically determined are retreated.
7. The method of claim 6, wherein the estimating a number of downlink OFDM symbols generating interference comprises:
according to the time position of the received first reference signal RS1, the number of downlink OFDM symbols generating interference is estimated.
8. A network side device for performing interference suppression, the network side device comprising: at least one processing unit and at least one memory unit, wherein the memory unit stores program code that, when executed by the processing unit, causes the processing unit to perform the following:
when the remote interference is determined, continuously transmitting a first reference signal RS1, so that an interference device receiving the first reference signal RS1 determines to generate the remote interference and starts to perform downlink symbol backoff;
monitoring whether a second reference signal RS2 sent by the interference device is received;
and when the second reference signal RS2 is received, determining that the remote interference does not disappear and performing uplink symbol backoff.
9. A network side device for performing interference suppression, the device comprising: at least one processing unit and at least one memory unit, wherein the memory unit stores program code that, when executed by the processing unit, causes the processing unit to perform the following:
when determining that a first reference signal RS1 transmitted by an interfered device is received, starting to carry out downlink symbol backoff;
and sending a second reference signal RS2 to the interfered device so that the interfered device determines that the remote interference does not disappear and starts uplink symbol backoff.
10. A computer-readable medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 3 or the steps of the method according to any one of claims 4 to 7.
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