CN105099964B - A kind of method and apparatus of power level estimation and determining interfered cell - Google Patents
A kind of method and apparatus of power level estimation and determining interfered cell Download PDFInfo
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Abstract
The present embodiments relate to wireless communication technology fields, more particularly to a kind of power level estimation and the method and apparatus for determining interfered cell, it is existing in the prior art in the presence of having strong jamming adjacent area to solve, it is superimposed high reject signal in channel estimation in frequency domain result, the intensity that cell can not be accurately estimated in the scheme of interfered cell intensity estimation at present, to cause the problem for the cell strength inaccuracy estimated.The embodiment of the present invention by channel estimation in frequency domain by transforming to time domain, the reception antenna most corresponding port of high power tap is found in time domain, by the power of effective diameter and to carry out power level estimation, to in the presence of having strong jamming adjacent area, the intensity of cell can be accurately estimated in the case of being superimposed high reject signal in channel estimation in frequency domain result, the influence that noise or interference can effectively be overcome improves the cell strength accuracy of estimation.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a method and an apparatus for estimating power strength and determining an interfering cell.
Background
LTE (Long Term Evolution ) R11 (version 11) introduces a fecicic (fused enhanced ICIC) technique to deal with strong interference of a local area by a Cell-specific pilot signal/PBCH (Physical Broadcast Channel) that occurs in heterogeneous scenarios such as a macro-pico (macro-pico) deployment scenario and a macro-femto (macro-femto) deployment scenario. In this scenario, user equipment in a CRE (Cell Range Expansion) region is strongly interfered by a CRS of a macro station or a common channel, and therefore, the UE (user equipment) needs to perform interference cancellation on the CRS/PBCH.
The existing interference cell strength estimation steps are as follows:
LS (Least Square) channel estimation is carried out on the cell to obtain the frequency domain channel estimation result
And calculating the RSRP (reference signal received power) of each cell by a power summation mode according to the frequency domain channel estimation result.
Under the condition that a strong interference neighbor exists, a strong interference signal is superposed in a frequency domain channel estimation result, and the intensity of a cell cannot be accurately estimated by the conventional method.
When the UE performs interference cancellation, the first problem to be solved is to determine a cell set including the interference cancellation and an interference cancellation order, and if the interference cell and the interference cancellation order are not reasonably selected, when the interference cancellation is caused, since the channel estimation of the interference cell is inaccurate, the interference information reconstruction is affected, and finally, the demodulation performance of the UE is affected.
In summary, when a strong interference neighbor exists, a strong interference signal is superimposed in the frequency domain channel estimation result, and the strength of the cell cannot be accurately estimated in the current interference cell strength estimation scheme, so that the estimated cell strength is inaccurate.
Disclosure of Invention
The embodiment of the invention provides a method and equipment for estimating power intensity, which are used for solving the problem that in the prior art, under the condition that a strong interference neighbor exists, a strong interference signal is superposed in a frequency domain channel estimation result, the intensity of a cell cannot be accurately estimated in the existing interference cell intensity estimation scheme, and the estimated cell intensity is inaccurate.
The embodiment of the invention also provides a method and equipment for determining the interference cell by using the power intensity estimation value obtained by the embodiment of the invention, which are used for solving the problem that the demodulation performance of user equipment is finally influenced because the channel estimation of the interference cell is inaccurate and the reconstruction of interference information is influenced in the prior art.
The method for estimating the power intensity provided by the embodiment of the invention comprises the following steps:
aiming at one antenna, performing least square LS channel estimation on CRS pilot frequency of each row of cell exclusive pilot signals of a cell to obtain a frequency domain channel estimation result corresponding to the receiving antenna;
determining a port number according to the frequency domain channel estimation result corresponding to the antenna;
determining a tap threshold value of each column of CRS pilot frequency of a port corresponding to the port number;
summing the path energy of all paths larger than the tap threshold value to obtain a sum value corresponding to a tap threshold value receiving antenna of each row of CRS pilot frequency of the corresponding port;
and adding the sum of each receiving antenna of the cell to obtain the power intensity estimated value of the cell.
Preferably, determining the port number according to the frequency domain channel estimation result corresponding to the antenna includes:
determining time domain channel impulse response corresponding to each row of CRS pilot frequency of each port of the receiving antenna according to the frequency domain channel estimation result corresponding to the receiving antenna;
determining tap power corresponding to each row of CRS pilot frequency of each port of the receiving antenna according to the time domain channel impact response corresponding to each row of CRS pilot frequency of each port of the receiving antenna;
and determining the port number corresponding to the maximum tap power in all tap powers corresponding to the receiving antenna.
Preferably, determining a tap threshold value of each CRS pilot column of the port corresponding to the port number includes:
determining a first threshold value of each row of CRS pilot frequency according to a noise tap of the time domain impact response of each row of CRS pilot frequency of the port corresponding to the port number, and determining a second threshold value of each row of CRS pilot frequency according to a maximum tap of the time domain impact response of each row of CRS pilot frequency of the port corresponding to the port number;
and selecting the maximum threshold value from the first threshold value and the second threshold value of each row of CRS pilot frequencies as the tap threshold value of each row of CRS pilot frequencies of the port corresponding to the port number.
Preferably, the first threshold value of each column of CRS pilots is determined according to the following formula:
wherein,number p of port number of receiving antenna r for cell ifirst threshold value of CRS pilot frequency, betanoiseIs a noise threshold coefficient; tau isCPIs the CP coefficient;for port number p of receiving antenna r△ N is CRS pilot frequency interval, N' is IFFT point number, and p is the port number of a determined receiving antenna r;
the second threshold value is determined according to the following equation:
wherein,number p of port number of receiving antenna r for cell isecond threshold value of column CRS pilot frequency, betacirIs an impulse response threshold coefficient; n' is the IFFT point number.
The embodiment of the invention provides a method for determining an interference cell by using a power intensity estimation value obtained by the method of the embodiment of the invention, which comprises the following steps:
aiming at one adjacent cell of the cell, respectively determining a first ratio representing the relation between adjacent cell power and low noise and a second ratio representing the adjacent cell power and the cell power according to the power intensity estimated value of the adjacent cell;
and if the first ratio is larger than a third threshold value and the second ratio is larger than a fourth threshold value, bringing the neighboring cell into an interference deletion cell set.
Preferably, determining the first ratio according to the power strength estimation value of the neighboring cell includes:
taking the ratio of the power intensity estimated value of the adjacent region to the average value of the multiple antennas measured in the Nth time of the region as the first ratio; or
Taking the ratio of the power intensity estimated value of the adjacent cell to the multi-antenna average value of the Mth noise measurement carried out by using the previous subframe as the first ratio; wherein N and M are positive integers;
determining a second ratio according to the power strength estimation value of the neighboring cell, including:
and taking the ratio of the power intensity estimated value of the adjacent cell to the power intensity estimated value of the cell as the second ratio.
Preferably, after the incorporating the neighboring cell into the interference deletion cell set, the method further includes:
if the power intensity estimated value of each adjacent cell in the interference deletion cell set is greater than the power intensity estimated value of the cell, excluding the cell from the interference deletion cell set;
otherwise, the cell is brought into the interference deletion cell set.
Preferably, after the cell is included in the interference cancellation cell set, the method further includes:
if all the adjacent cells of the interference deletion cell set comprise specific adjacent cells, arranging the cell in front of all the specific adjacent cells when the adjacent cells of the interference deletion cell set are arranged from large to small according to the power intensity; or when the adjacent cells of the interference deletion cell set are arranged from small to large according to the power intensity, arranging the cell behind all the specific adjacent cells;
and the specific cell is a neighboring cell which has a corresponding power intensity estimated value equal to the power intensity estimated value of the cell or has an absolute value of a difference with the power intensity estimated value of the cell not greater than a fifth threshold value and collides with the CRS of the cell.
The power intensity estimation device provided by the embodiment of the invention comprises:
the channel estimation module is used for carrying out least square LS channel estimation on CRS pilot frequency of a cell exclusive pilot signal of each row of cells aiming at one antenna to obtain a frequency domain channel estimation result corresponding to the receiving antenna;
a port determining module, configured to determine a port number according to the frequency domain channel estimation result corresponding to the antenna;
a threshold value determining module, configured to determine a tap threshold value of each CRS pilot of a port corresponding to the port number;
a sum value determining module, configured to sum the path energies of all paths greater than the tap threshold value to obtain a sum value corresponding to a tap threshold value receiving antenna of each row of CRS pilots of the corresponding port;
and the estimated value determining module is used for adding the sum of each receiving antenna of the cell to obtain the estimated value of the power intensity of the cell.
Preferably, the port determination module is specifically configured to:
determining time domain channel impulse response corresponding to each row of CRS pilot frequency of each port of the receiving antenna according to the frequency domain channel estimation result corresponding to the receiving antenna; determining tap power corresponding to each row of CRS pilot frequency of each port of the receiving antenna according to the time domain channel impact response corresponding to each row of CRS pilot frequency of each port of the receiving antenna; and determining the port number corresponding to the maximum tap power in all tap powers corresponding to the receiving antenna.
Preferably, the threshold value determining module is specifically configured to:
determining a first threshold value of each row of CRS pilot frequency according to a noise tap of the time domain impact response of each row of CRS pilot frequency of the port corresponding to the port number, and determining a second threshold value of each row of CRS pilot frequency according to a maximum tap of the time domain impact response of each row of CRS pilot frequency of the port corresponding to the port number; and selecting the maximum threshold value from the first threshold value and the second threshold value of each row of CRS pilot frequencies as the tap threshold value of each row of CRS pilot frequencies of the port corresponding to the port number.
Preferably, the threshold determining module is specifically configured to determine the first threshold of each row of CRS pilots according to the following formula:
wherein,number p of port number of receiving antenna r for cell ifirst threshold value of CRS pilot frequency, betanoiseIs a noise threshold coefficient; tau isCPIs the CP coefficient;for port number p of receiving antenna r△ N is CRS pilot frequency interval, N' is IFFT point number, and p is the port number of a determined receiving antenna r;
the threshold value determining module is specifically configured to determine a second threshold value according to the following formula:
wherein,number p of port number of receiving antenna r for cell isecond threshold value of column CRS pilot frequency, betacirIs an impulse response threshold coefficient; n' is the IFFT point number.
The embodiment of the invention provides equipment for determining an interference cell by using a power strength estimation value obtained by the method of the embodiment of the invention, and the equipment comprises:
a ratio determining module, configured to determine, for a neighboring cell of the current cell, a first ratio indicating a relationship between neighboring cell power and low noise and a second ratio indicating neighboring cell power and current cell power, respectively, according to the power strength estimation value of the neighboring cell;
and the processing module is configured to, if the first ratio is greater than a third threshold and the second ratio is greater than a fourth threshold, incorporate the neighboring cell into an interference-canceled cell set.
Preferably, the ratio determining module is specifically configured to:
taking the ratio of the power intensity estimated value of the adjacent region to the average value of the multiple antennas measured in the Nth time of the region as the first ratio; or taking the ratio of the power intensity estimated value of the adjacent cell to the multi-antenna average value of the Mth noise measurement carried out by using the previous subframe as the first ratio; wherein N and M are positive integers;
and taking the ratio of the power intensity estimated value of the adjacent cell to the power intensity estimated value of the cell as the second ratio.
Preferably, the processing module is further configured to:
if the power intensity estimated value of each adjacent cell in the interference deletion cell set is greater than the power intensity estimated value of the cell, excluding the cell from the interference deletion cell set; otherwise, the cell is brought into the interference deletion cell set.
Preferably, the processing module is further configured to:
if all the adjacent cells of the interference deletion cell set comprise specific adjacent cells, arranging the cell in front of all the specific adjacent cells when the adjacent cells of the interference deletion cell set are arranged from large to small according to the power intensity; or when the adjacent cells of the interference deletion cell set are arranged from small to large according to the power intensity, arranging the cell behind all the specific adjacent cells;
and the specific cell is a neighboring cell which has a corresponding power intensity estimated value equal to the power intensity estimated value of the cell or has an absolute value of a difference with the power intensity estimated value of the cell not greater than a fifth threshold value and collides with the CRS of the cell.
The embodiment of the invention can accurately estimate the intensity of the cell under the condition that a strong interference signal is superposed in the frequency domain channel estimation result under the condition that a strong interference adjacent cell exists by converting the frequency domain channel estimation to the time domain, searching the port corresponding to the strongest power tap of the receiving antenna in the time domain and estimating the power intensity through the power sum of the effective diameter, thereby effectively overcoming the influence of noise or interference and improving the accuracy of the estimated cell intensity.
Drawings
FIG. 1 is a flow chart illustrating a method for power level estimation according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a method for determining an interfering cell according to a second embodiment of the present invention;
fig. 3 is a flowchart illustrating a method for determining an interfering cell according to a third embodiment of the present invention;
FIG. 4 is a schematic diagram of an apparatus for estimating four power levels according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an apparatus for estimating five power levels according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an apparatus for determining an interfering cell according to a sixth embodiment of the present invention;
fig. 7 is a schematic structural diagram of an apparatus for determining an interfering cell according to a seventh embodiment of the present invention.
Detailed Description
The embodiment of the invention can accurately estimate the intensity of the cell under the condition that a strong interference signal is superposed in the frequency domain channel estimation result under the condition that a strong interference adjacent cell exists by converting the frequency domain channel estimation to the time domain, searching the port corresponding to the strongest power tap of the receiving antenna in the time domain and estimating the power intensity through the power sum of the effective diameter, thereby effectively overcoming the influence of noise or interference and improving the accuracy of the estimated cell intensity.
As shown in fig. 1, a method for power strength estimation according to an embodiment of the present invention includes:
step 100, aiming at one antenna, performing LS channel estimation on CRS pilot frequency of each row of a cell to obtain a frequency domain channel estimation result corresponding to the receiving antenna;
step 101, determining a port number according to the frequency domain channel estimation result corresponding to the antenna;
step 102, determining a tap threshold value of each row of CRS pilot frequency of a port corresponding to the port number;
step 103, summing the path energy of all paths larger than the tap threshold value to obtain a sum value corresponding to the receiving antenna;
and step 104, adding the sum of each receiving antenna of the cell to obtain the power intensity estimated value of the cell.
Specifically, assume that the local area ID isNeighbor cell ID of
To the cellThe CRS performs LS channel estimation to obtain a frequency domain channel estimation result, which is shown as
Where r is the index of the receiving antenna number, p is the index of the antenna port,is the number of pilot columns for port p,to represent port pAnd (4) frequency domain channel estimation results of the column pilots.
In implementation, determining a port number according to the frequency domain channel estimation result corresponding to the antenna includes:
determining time domain channel impulse response corresponding to each row of CRS pilot frequency of each port of the receiving antenna according to the frequency domain channel estimation result corresponding to the receiving antenna;
determining tap power corresponding to each row of CRS pilot frequency of each port of the receiving antenna according to the time domain channel impact response corresponding to each row of CRS pilot frequency of each port of the receiving antenna;
and determining the port number corresponding to the maximum tap power in all tap powers corresponding to the receiving antenna.
Specifically, the method comprises the following steps:
1. will be provided withPerforming IFFT conversion on N' points to obtain time domain channel impulse response
Wherein,preferably N' is an integer power of 2.
2. Determining tap power corresponding to each column of CRS pilot frequency of each port of the receiving antenna
Tap powerComprises the following steps:
3. determining a cellThe port number corresponding to the maximum power tap of the receiving antenna r is marked as
Selecting
In an implementation, determining a tap threshold value of each CRS pilot column of a port corresponding to the port number includes:
determining a first threshold value of each row of CRS pilot frequency according to a noise tap of the time domain impact response of each row of CRS pilot frequency of the port corresponding to the port number, and determining a second threshold value of each row of CRS pilot frequency according to a maximum tap of the time domain impact response of each row of CRS pilot frequency of the port corresponding to the port number;
and selecting the maximum threshold value from the first threshold value and the second threshold value of each row of CRS pilot frequencies as the tap threshold value of each row of CRS pilot frequencies of the port corresponding to the port number.
In particular, a tap threshold for the receiving antenna r is determined
Wherein,is a first threshold value of the first threshold value,is a second threshold value.
Preferably, the first threshold value of each column of CRS pilots is determined according to the following formula:
wherein,number p of port number of receiving antenna r for cell ifirst threshold value of CRS pilot frequency, betanoiseIs a noise threshold coefficient; tau isCPIs the CP coefficient;for port number p of receiving antenna r△ N is CRS pilot frequency interval, N' is IFFT point number, and p is the port number of a determined receiving antenna r;
the second threshold value is determined according to the following equation:
wherein,number p of port number of receiving antenna r for cell isecond threshold value of column CRS pilot frequency, betacirIs an impulse response threshold coefficient; n' is the IFFT point number.
In implementation, when the path energies of all paths greater than the tap threshold value are summed to obtain the sum value corresponding to the receiving antenna, the path set greater than the tap threshold value is foundNamely, an effective path is found, and path energy of the effective path is summed to obtain
In implementation, when the sum of each receiving antenna of the cell is added to obtain the power strength estimation value of the cell, the sum of each receiving antenna of each cell is added to the power strength estimation value of each cellRespectively adding the receiving antenna and the pilot frequency array to obtain the power strength measurement result S of each cellcell_i(0. ltoreq. I. ltoreq.I), i.e.
As shown in fig. 2, in the method for determining an interfering cell according to the second embodiment of the present invention, the interfering cell is determined by using the power strength estimation value of each cell obtained in fig. 1 according to the second embodiment of the present invention. The method specifically comprises the following steps:
step 200, aiming at a neighboring cell of the cell, respectively determining a first ratio representing the relation between the power of the neighboring cell and the low noise and a second ratio representing the power of the neighboring cell and the power of the cell according to the power intensity estimated value of the neighboring cell;
step 201, if the first ratio is greater than a third threshold and the second ratio is greater than a fourth threshold, bringing the neighboring cell into an interference-canceled cell set.
In implementation, determining a first ratio according to the power strength estimation value of the neighboring cell includes:
taking the ratio of the power intensity estimated value of the adjacent region to the average value of the multiple antennas measured in the Nth time of the region as the first ratio; or
Taking the ratio of the power intensity estimated value of the adjacent cell to the multi-antenna average value of the Mth noise measurement carried out by using the previous subframe as the first ratio; wherein N and M are positive integers;
determining a second ratio according to the power strength estimation value of the neighboring cell, including:
and taking the ratio of the power intensity estimated value of the adjacent cell to the power intensity estimated value of the cell as the second ratio.
Specifically, a third threshold value Th3 and a fourth threshold value Th4 are set, when the cell is in a current stateSatisfy the requirement ofAnd isTime, cellInterference cancellation cell range is included.
Wherein,the local multi-antenna average value of the first noise measurement or the multi-antenna average value of the second noise measurement using the previous subframe can be used. The set of cells satisfying the condition is recorded as The number of elements is recorded as NCell_Num。
In the research aiming at the LTE system FeICIC, two heterogeneous network macro-pico deployment scenes and a macro-femto deployment scene are focused. The embodiment of the invention can also select whether the cell is included in the deleted cell set. Specifically, the method comprises the following steps:
after the neighboring cell is brought into the interference deletion cell set, the method further includes:
if the power intensity estimated value of each adjacent cell in the interference deletion cell set is greater than the power intensity estimated value of the cell, excluding the cell from the interference deletion cell set;
otherwise, the cell is brought into the interference deletion cell set.
Such as: will be assembledCell S incell_i(i>0) is sorted from large to small, namely the strength of each cell is sorted. If it is notThen the set of cells for parameter interference cancellation isOtherwise the set of cells participating in interference cancellation is denoted as
Preferably, after the cell is included in the interference cancellation cell set, the method further includes:
if all the adjacent cells of the interference deletion cell set comprise specific adjacent cells, arranging the cell in front of all the specific adjacent cells when the adjacent cells of the interference deletion cell set are arranged from large to small according to the power intensity; or when the adjacent cells of the interference deletion cell set are arranged from small to large according to the power intensity, arranging the cell behind all the specific adjacent cells;
and the specific cell is a neighboring cell which has a corresponding power intensity estimated value equal to the power intensity estimated value of the cell or has an absolute value of a difference with the power intensity estimated value of the cell not greater than a fifth threshold value and collides with the CRS of the cell.
Such as: if setCell Scell_iAnd when the intensities are equal or the intensity difference is small and the CRS is collided, setting a fourth threshold value Th4 or a fifth threshold value Th5 to represent the power difference. I Scell_0-Scell_iLess than or equal to Th4 or Scell_0-Scell_iAnd if the absolute value is less than or equal to Th5, the sorting of the local area is prior when the interference deletion is sorted. Because the timing synchronization of the cell is accurate, the channel estimation is accurate under the condition of similar power.
As can be seen from the above embodiments: the embodiment of the invention carries out sequencing operation on the multiple cells, and enables the UE to carry out channel estimation on the strongest cell every time, so that when CRS collision occurs, the channel estimation of the strong neighbor cell is firstly carried out, the channel estimation accuracy is higher, the channel estimation can be carried out on the cell with lower power strength after CRS interference deletion can be effectively carried out, and the channel estimation accuracy is improved. In addition, a protection threshold is added, so that performance deterioration caused by introducing unnecessary interference deletion operation when the power intensity of a small interference neighbor cell or a local cell is high is avoided.
As shown in fig. 3, a method for determining an interfering cell according to a third embodiment of the present invention includes:
assume that the local area ID isNeighbor cell ID of
Step 300, for the cellThe CRS performs LS channel estimation to obtain frequency domain channel estimation, and the result is expressed as
Step 301, mixingObtaining time domain channel impulse response by performing IFFT (inverse fast Fourier transform) of N points
Step 302, calculateTap power of
Step 303, determining a cellThe port number corresponding to the maximum power tap of the receiving antenna r is marked as
Step 304, determining r port number of receiving antennaThe tap threshold value of CRS pilot frequency of each column of the corresponding port
Step 305, summing the path energy of all paths larger than the tap threshold value to obtain the sum value corresponding to the tap threshold value receiving antenna of each row of CRS pilot frequency of the corresponding port
Step 306, adding the sum of each receiving antenna of the cell to obtain the power intensity estimation value S of the cellcell_i(0≤i≤I)。
Step 307, for a neighboring cell of the cell, respectively determining a first ratio representing a relationship between neighboring cell power and low noise and a second ratio representing neighboring cell power and the cell power according to the power strength estimation value of the neighboring cell, and if the first ratio is greater than a third threshold and the second ratio is greater than a fourth threshold, incorporating the neighboring cell into an interference-canceled cell set.
Step 308, if the power strength estimation value of each neighboring cell in the interference deletion cell set is greater than the power strength estimation value of the cell, excluding the cell from the interference deletion cell set; otherwise, the cell is brought into the interference deletion cell set.
Step 309, if all the neighboring cells of the interference deletion cell set include specific neighboring cells, when the neighboring cells of the interference deletion cell set are arranged from large to small according to the power intensity, arranging the cell in front of all the specific neighboring cells; or when the adjacent cells of the interference deletion cell set are arranged from small to large according to the power intensity, arranging the cell behind all the specific adjacent cells.
Based on the same inventive concept, the embodiment of the present invention further provides a device for estimating power strength, and since the device for estimating power strength is a device corresponding to the method for estimating power strength in the embodiment of the present invention as shown in fig. 1, and the principle of solving the problem of the device is similar to that of the method, the implementation of the device may refer to the implementation of the method, and repeated details are omitted.
As shown in fig. 4, the apparatus for estimating four power intensities according to the embodiment of the present invention includes:
a channel estimation module 400, configured to perform least square LS channel estimation on CRS pilots of dedicated pilot signals of each row of cells of a cell for an antenna to obtain a frequency domain channel estimation result corresponding to the receiving antenna;
a port determining module 410, configured to determine a port number according to the frequency domain channel estimation result corresponding to the antenna;
a threshold determining module 420, configured to determine a tap threshold of each CRS pilot of a port corresponding to the port number;
a sum value determining module 430, configured to sum the path energies of all paths greater than the tap threshold value to obtain a sum value corresponding to a tap threshold value receiving antenna of each row of CRS pilots of the corresponding port;
an estimated value determining module 440, configured to add the sum of each receiving antenna of the cell to obtain an estimated value of the power strength of the cell.
Preferably, the port determining module 410 is specifically configured to:
determining time domain channel impulse response corresponding to each row of CRS pilot frequency of each port of the receiving antenna according to the frequency domain channel estimation result corresponding to the receiving antenna; determining tap power corresponding to each row of CRS pilot frequency of each port of the receiving antenna according to the time domain channel impact response corresponding to each row of CRS pilot frequency of each port of the receiving antenna; and determining the port number corresponding to the maximum tap power in all tap powers corresponding to the receiving antenna.
Preferably, the threshold value determining module 420 is specifically configured to:
determining a first threshold value of each row of CRS pilot frequency according to a noise tap of the time domain impact response of each row of CRS pilot frequency of the port corresponding to the port number, and determining a second threshold value of each row of CRS pilot frequency according to a maximum tap of the time domain impact response of each row of CRS pilot frequency of the port corresponding to the port number; and selecting the maximum threshold value from the first threshold value and the second threshold value of each row of CRS pilot frequencies as the tap threshold value of each row of CRS pilot frequencies of the port corresponding to the port number.
Preferably, the threshold determining module 420 is specifically configured to determine the first threshold of each row of CRS pilots according to the following formula:
wherein,number p of port number of receiving antenna r for cell ifirst threshold value of CRS pilot frequency, betanoiseIs a noise threshold coefficient; tau isCPIs the CP coefficient;for port number p of receiving antenna r△ N is CRS pilot frequency interval, N' is IFFT point number, and p is the port number of a determined receiving antenna r;
preferably, the threshold value determining module 420 is specifically configured to determine the second threshold value according to the following formula:
wherein,number p of port number of receiving antenna r for cell isecond threshold value of column CRS pilot frequency, betacirIs an impulse response threshold coefficient; n' is the IFFT point number.
As shown in fig. 5, the apparatus for five power strength estimation according to the embodiment of the present invention,
a processor 500, configured to perform least square LS channel estimation on CRS pilots of dedicated pilot signals of each row of cells of a cell for an antenna to obtain a frequency domain channel estimation result corresponding to the receiving antenna; determining a port number according to the frequency domain channel estimation result corresponding to the antenna; determining a tap threshold value of each column of CRS pilot frequency of a port corresponding to the port number; summing the path energy of all paths larger than the tap threshold value to obtain a sum value corresponding to a tap threshold value receiving antenna of each row of CRS pilot frequency of the corresponding port; adding the sum of each receiving antenna of the cell to obtain a power intensity estimated value of the cell;
a transceiver 510 for receiving and transmitting data under the control of the processor 500.
Preferably, the processor 500 is specifically configured to:
determining time domain channel impulse response corresponding to each row of CRS pilot frequency of each port of the receiving antenna according to the frequency domain channel estimation result corresponding to the receiving antenna; determining tap power corresponding to each row of CRS pilot frequency of each port of the receiving antenna according to the time domain channel impact response corresponding to each row of CRS pilot frequency of each port of the receiving antenna; and determining the port number corresponding to the maximum tap power in all tap powers corresponding to the receiving antenna.
Preferably, the processor 500 is specifically configured to:
determining a first threshold value of each row of CRS pilot frequency according to a noise tap of the time domain impact response of each row of CRS pilot frequency of the port corresponding to the port number, and determining a second threshold value of each row of CRS pilot frequency according to a maximum tap of the time domain impact response of each row of CRS pilot frequency of the port corresponding to the port number; and selecting the maximum threshold value from the first threshold value and the second threshold value of each row of CRS pilot frequencies as the tap threshold value of each row of CRS pilot frequencies of the port corresponding to the port number.
Preferably, the processor 500 is specifically configured to determine the first threshold value of each CRS pilot column according to the following formula:
wherein,number p of port number of receiving antenna r for cell ifirst threshold value of CRS pilot frequency, betanoiseIs a noise threshold coefficient; tau isCPIs the CP coefficient;for port number p of receiving antenna rnoise taps of time domain impulse response of CRS pilot frequency, △ N is CRS pilot frequency interval, N' is IFFT point number, p is determined port of receiving antenna rNumber;
preferably, the processor 500 is specifically configured to determine the second threshold value according to the following formula:
wherein,number p of port number of receiving antenna r for cell isecond threshold value of column CRS pilot frequency, betacirIs an impulse response threshold coefficient; n' is the IFFT point number.
Wherein in fig. 5, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 500, and various circuits, represented by memory 520, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 510 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. The processor 500 is responsible for managing the bus architecture and general processing, and the memory 520 may store data used by the processor 500 in performing operations.
The processor 500 is responsible for managing the bus architecture and general processing, and the memory 520 may store data used by the processor 500 in performing operations.
Based on the same inventive concept, the embodiment of the present invention further provides a device for determining an interfering cell, and since the device for estimating power strength is a device corresponding to the method for determining an interfering cell in the embodiment of the present invention shown in fig. 2, and the principle of solving the problem of the device is similar to that of the method, the implementation of the device may refer to the implementation of the method, and repeated details are omitted.
As shown in fig. 6, a sixth apparatus for determining an interfering cell according to an embodiment of the present invention determines an interfering cell by using a power strength estimation value obtained according to the embodiment of the present invention, which specifically includes:
a ratio determining module 600, configured to determine, for a neighboring cell of a current cell, a first ratio indicating a relationship between neighboring cell power and low noise and a second ratio indicating neighboring cell power and current cell power according to a power strength estimation value of the neighboring cell;
a processing module 610, configured to, if the first ratio is greater than a third threshold and the second ratio is greater than a fourth threshold, incorporate the neighboring cell into an interference-canceled cell set.
Preferably, the ratio determining module 600 is specifically configured to:
taking the ratio of the power intensity estimated value of the adjacent region to the average value of the multiple antennas measured in the Nth time of the region as the first ratio; or taking the ratio of the power intensity estimated value of the adjacent cell to the multi-antenna average value of the Mth noise measurement carried out by using the previous subframe as the first ratio; wherein N and M are positive integers;
and taking the ratio of the power intensity estimated value of the adjacent cell to the power intensity estimated value of the cell as the second ratio.
Preferably, the processing module 610 is further configured to:
if the power intensity estimated value of each adjacent cell in the interference deletion cell set is greater than the power intensity estimated value of the cell, excluding the cell from the interference deletion cell set; otherwise, the cell is brought into the interference deletion cell set.
Preferably, the processing module 610 is further configured to:
if all the adjacent cells of the interference deletion cell set comprise specific adjacent cells, arranging the cell in front of all the specific adjacent cells when the adjacent cells of the interference deletion cell set are arranged from large to small according to the power intensity; or when the adjacent cells of the interference deletion cell set are arranged from small to large according to the power intensity, arranging the cell behind all the specific adjacent cells;
and the specific cell is a neighboring cell which has a corresponding power intensity estimated value equal to the power intensity estimated value of the cell or has an absolute value of a difference with the power intensity estimated value of the cell not greater than a fifth threshold value and collides with the CRS of the cell.
Wherein, since the device for power strength estimation and the device for determining the interfering cell may be one device, the modules of fig. 4 and fig. 6 may be combined in one entity.
As shown in fig. 7, the apparatus for determining an interfering cell according to the seventh embodiment of the present invention, which determines an interfering cell by using a power strength estimation value obtained according to the seventh embodiment of the present invention, specifically includes:
a processor 700, configured to determine, for a neighboring cell of a current cell, a first ratio representing a relationship between neighboring cell power and low noise and a second ratio representing neighboring cell power and current cell power according to a power strength estimation value of the neighboring cell; if the first ratio is larger than a third threshold value and the second ratio is larger than a fourth threshold value, bringing the neighboring cell into an interference deletion cell set;
a transceiver 710 for receiving and transmitting data under the control of the processor 700.
Preferably, the processor 700 is specifically configured to:
taking the ratio of the power intensity estimated value of the adjacent region to the average value of the multiple antennas measured in the Nth time of the region as the first ratio; or taking the ratio of the power intensity estimated value of the adjacent cell to the multi-antenna average value of the Mth noise measurement carried out by using the previous subframe as the first ratio; wherein N and M are positive integers;
and taking the ratio of the power intensity estimated value of the adjacent cell to the power intensity estimated value of the cell as the second ratio.
Preferably, the processor 700 is further configured to:
if the power intensity estimated value of each adjacent cell in the interference deletion cell set is greater than the power intensity estimated value of the cell, excluding the cell from the interference deletion cell set; otherwise, the cell is brought into the interference deletion cell set.
Preferably, the processor 700 is further configured to:
if all the adjacent cells of the interference deletion cell set comprise specific adjacent cells, arranging the cell in front of all the specific adjacent cells when the adjacent cells of the interference deletion cell set are arranged from large to small according to the power intensity; or when the adjacent cells of the interference deletion cell set are arranged from small to large according to the power intensity, arranging the cell behind all the specific adjacent cells;
and the specific cell is a neighboring cell which has a corresponding power intensity estimated value equal to the power intensity estimated value of the cell or has an absolute value of a difference with the power intensity estimated value of the cell not greater than a fifth threshold value and collides with the CRS of the cell.
Where in fig. 7, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 700 and memory represented by memory 720. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 710 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. The processor 700 is responsible for managing the bus architecture and general processing, and the memory 720 may store data used by the processor 700 in performing operations.
The processor 700 is responsible for managing the bus architecture and general processing, and the memory 720 may store data used by the processor 700 in performing operations.
Wherein, since the device for power strength estimation and the device for determining the interfering cell may be one device, the modules of fig. 5 and fig. 7 may be combined in one entity.
As can be seen from the above embodiments: the embodiment of the invention can accurately estimate the intensity of the cell under the condition that a strong interference signal is superposed in the frequency domain channel estimation result under the condition that a strong interference adjacent cell exists by converting the frequency domain channel estimation to the time domain, searching the port corresponding to the strongest power tap of the receiving antenna in the time domain and estimating the power intensity through the power sum of the effective diameter, thereby effectively overcoming the influence of noise or interference and improving the accuracy of the estimated cell intensity.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
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 (16)
1. A method of power strength estimation, the method comprising:
aiming at one antenna, performing least square LS channel estimation on CRS pilot frequency of each row of cell exclusive pilot signals of a cell to obtain a frequency domain channel estimation result corresponding to a receiving antenna;
determining a port number according to the frequency domain channel estimation result corresponding to the antenna;
determining a tap threshold value of each column of CRS pilot frequency of a port corresponding to the port number;
summing the path energy of all paths larger than the tap threshold value to obtain a sum value corresponding to a tap threshold value receiving antenna of each row of CRS pilot frequency of the corresponding port;
and adding the sum of each receiving antenna of the cell to obtain the power intensity estimated value of the cell.
2. The method of claim 1, wherein determining a port number according to the frequency domain channel estimation result corresponding to the antenna comprises:
determining time domain channel impulse response corresponding to each row of CRS pilot frequency of each port of the receiving antenna according to the frequency domain channel estimation result corresponding to the receiving antenna;
determining tap power corresponding to each row of CRS pilot frequency of each port of the receiving antenna according to the time domain channel impact response corresponding to each row of CRS pilot frequency of each port of the receiving antenna;
and determining the port number corresponding to the maximum tap power in all tap powers corresponding to the receiving antenna.
3. The method of claim 1, wherein determining the tap threshold values for each column of CRS pilots for the port corresponding to the port number comprises:
determining a first threshold value of each row of CRS pilot frequency according to a noise tap of the time domain impact response of each row of CRS pilot frequency of the port corresponding to the port number, and determining a second threshold value of each row of CRS pilot frequency according to a maximum tap of the time domain impact response of each row of CRS pilot frequency of the port corresponding to the port number;
and selecting the maximum threshold value from the first threshold value and the second threshold value of each row of CRS pilot frequencies as the tap threshold value of each row of CRS pilot frequencies of the port corresponding to the port number.
4. The method of claim 3, wherein the first threshold value for each column of CRS pilots is determined according to the following equation:
wherein,number p of port number of receiving antenna r for cell ifirst threshold value of CRS pilot frequency, betanoiseIs a noise threshold coefficient; tau isCPIs the CP coefficient;for port number p of receiving antenna r△ N is CRS pilot frequency interval, N' is IFFT point number, and p is the port number of a determined receiving antenna r;
the second threshold value is determined according to the following equation:
wherein,number p of port number of receiving antenna r for cell isecond threshold value of column CRS pilot frequency, betacirIs an impulse response threshold coefficient; n' is the number of IFFT points,is the number of ports.
5. A method for determining an interfering cell using the power strength estimate obtained by the method of any one of claims 1 to 4, the method comprising:
aiming at one adjacent cell of the cell, respectively determining a first ratio representing the relation between adjacent cell power and low noise and a second ratio representing the adjacent cell power and the cell power according to the power intensity estimated value of the adjacent cell;
and if the first ratio is larger than a third threshold value and the second ratio is larger than a fourth threshold value, bringing the neighboring cell into an interference deletion cell set.
6. The method of claim 5, wherein determining the first ratio based on the power strength estimate for the neighbor cell comprises:
taking the ratio of the power intensity estimated value of the adjacent region to the average value of the multiple antennas measured in the Nth time of the region as the first ratio; or
Taking the ratio of the power intensity estimated value of the adjacent cell to the multi-antenna average value of the Mth noise measurement carried out by using the previous subframe as the first ratio; wherein N and M are positive integers;
determining a second ratio according to the power strength estimation value of the neighboring cell, including:
and taking the ratio of the power intensity estimated value of the adjacent cell to the power intensity estimated value of the cell as the second ratio.
7. The method of claim 5, wherein after incorporating the neighboring cell into an interference cancellation cell set, further comprising:
if the power intensity estimated value of each adjacent cell in the interference deletion cell set is greater than the power intensity estimated value of the cell, excluding the cell from the interference deletion cell set;
otherwise, the cell is brought into the interference deletion cell set.
8. The method of claim 7, wherein after the cell is included in the set of interference cancellation cells, further comprising:
if all the adjacent cells of the interference deletion cell set comprise specific adjacent cells, arranging the cell in front of all the specific adjacent cells when the adjacent cells of the interference deletion cell set are arranged from large to small according to the power intensity; or when the adjacent cells of the interference deletion cell set are arranged from small to large according to the power intensity, arranging the cell behind all the specific adjacent cells;
and the specific cell is a neighboring cell which has a corresponding power intensity estimated value equal to the power intensity estimated value of the cell or has an absolute value of a difference with the power intensity estimated value of the cell not greater than a fifth threshold value and collides with the CRS of the cell.
9. An apparatus for power strength estimation, the apparatus comprising:
the channel estimation module is used for carrying out least square LS channel estimation on CRS pilot frequency of a cell exclusive pilot signal of each row of cells aiming at one antenna to obtain a frequency domain channel estimation result corresponding to a receiving antenna;
a port determining module, configured to determine a port number according to the frequency domain channel estimation result corresponding to the antenna;
a threshold value determining module, configured to determine a tap threshold value of each CRS pilot of a port corresponding to the port number;
a sum value determining module, configured to sum the path energies of all paths greater than the tap threshold value to obtain a sum value corresponding to a tap threshold value receiving antenna of each row of CRS pilots of the corresponding port;
and the estimated value determining module is used for adding the sum of each receiving antenna of the cell to obtain the estimated value of the power intensity of the cell.
10. The device of claim 9, wherein the port determination module is specifically configured to:
determining time domain channel impulse response corresponding to each row of CRS pilot frequency of each port of the receiving antenna according to the frequency domain channel estimation result corresponding to the receiving antenna; determining tap power corresponding to each row of CRS pilot frequency of each port of the receiving antenna according to the time domain channel impact response corresponding to each row of CRS pilot frequency of each port of the receiving antenna; and determining the port number corresponding to the maximum tap power in all tap powers corresponding to the receiving antenna.
11. The device of claim 9, wherein the threshold determination module is specifically configured to:
determining a first threshold value of each row of CRS pilot frequency according to a noise tap of the time domain impact response of each row of CRS pilot frequency of the port corresponding to the port number, and determining a second threshold value of each row of CRS pilot frequency according to a maximum tap of the time domain impact response of each row of CRS pilot frequency of the port corresponding to the port number; and selecting the maximum threshold value from the first threshold value and the second threshold value of each row of CRS pilot frequencies as the tap threshold value of each row of CRS pilot frequencies of the port corresponding to the port number.
12. The device of claim 11, wherein the threshold determination module is specifically configured to determine the first threshold for each row of CRS pilots according to the following formula:
wherein,number p of port number of receiving antenna r for cell ifirst threshold value of CRS pilot frequency, betanoiseIs a noise threshold coefficient; tau isCPIs the CP coefficient;for port number p of receiving antenna r△ N is CRS pilot frequency interval, N' is IFFT point number, and p is the port number of a determined receiving antenna r;
the threshold value determining module is specifically configured to determine a second threshold value according to the following formula:
wherein,number p of port number of receiving antenna r for cell isecond threshold value of column CRS pilot frequency, betacirIs an impulse response threshold coefficient; n' is the number of IFFT points,is the number of ports.
13. An apparatus for determining an interfering cell using power strength estimates obtained by any of the methods of claims 1 to 4, the apparatus comprising:
a ratio determining module, configured to determine, for a neighboring cell of the current cell, a first ratio indicating a relationship between neighboring cell power and low noise and a second ratio indicating neighboring cell power and current cell power, respectively, according to the power strength estimation value of the neighboring cell;
and the processing module is configured to, if the first ratio is greater than a third threshold and the second ratio is greater than a fourth threshold, incorporate the neighboring cell into an interference-canceled cell set.
14. The device of claim 13, wherein the ratio determination module is specifically configured to:
taking the ratio of the power intensity estimated value of the adjacent region to the average value of the multiple antennas measured in the Nth time of the region as the first ratio; or taking the ratio of the power intensity estimated value of the adjacent cell to the multi-antenna average value of the Mth noise measurement carried out by using the previous subframe as the first ratio; wherein N and M are positive integers;
and taking the ratio of the power intensity estimated value of the adjacent cell to the power intensity estimated value of the cell as the second ratio.
15. The device of claim 13, wherein the processing module is further to:
if the power intensity estimated value of each adjacent cell in the interference deletion cell set is greater than the power intensity estimated value of the cell, excluding the cell from the interference deletion cell set; otherwise, the cell is brought into the interference deletion cell set.
16. The device of claim 14, wherein the processing module is further to:
if all the adjacent cells of the interference deletion cell set comprise specific adjacent cells, arranging the cell in front of all the specific adjacent cells when the adjacent cells of the interference deletion cell set are arranged from large to small according to the power intensity; or when the adjacent cells of the interference deletion cell set are arranged from small to large according to the power intensity, arranging the cell behind all the specific adjacent cells;
and the specific cell is a neighboring cell which has a corresponding power intensity estimated value equal to the power intensity estimated value of the cell or has an absolute value of a difference with the power intensity estimated value of the cell not greater than a fifth threshold value and collides with the CRS of the cell.
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| PCT/CN2015/078401 WO2015169229A1 (en) | 2014-05-07 | 2015-05-06 | Method and device for estimating power intensity and determining interference cell |
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| CN106658567B (en) * | 2016-12-09 | 2020-05-22 | 厦门安胜网络科技有限公司 | Mobile communication terminal detection equipment |
| WO2019237285A1 (en) * | 2018-06-13 | 2019-12-19 | Qualcomm Incorporated | Explicit channel state information (csi) with spatial and time domain compression |
| CN111628790B (en) * | 2020-05-28 | 2021-06-29 | 成都天奥信息科技有限公司 | High-precision anti-interference method and device based on interference bandwidth detection |
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| CN102113381A (en) * | 2008-08-01 | 2011-06-29 | 高通股份有限公司 | Successive detection and cancellation for cell pilot detection |
| CN102572894A (en) * | 2011-12-30 | 2012-07-11 | 华为技术有限公司 | Method and device for selecting interference cells |
| CN103701478A (en) * | 2012-09-27 | 2014-04-02 | 富士通株式会社 | Interference elimination device and receiver |
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| ES2639643T3 (en) * | 2010-06-23 | 2017-10-27 | Telefonaktiebolaget Lm Ericsson (Publ) | Interference management of reference signals in deployments of heterogeneous networks |
| US20120113961A1 (en) * | 2010-11-08 | 2012-05-10 | Motorola Mobility, Inc. | Interference Measurements in Enhanced Inter-Cell Interference Coordination Capable Wireless Terminals |
| US9066367B2 (en) * | 2012-03-29 | 2015-06-23 | Intel Mobile Communications GmbH | Macro-femto inter-cell interference mitigation |
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| CN102113381A (en) * | 2008-08-01 | 2011-06-29 | 高通股份有限公司 | Successive detection and cancellation for cell pilot detection |
| CN102572894A (en) * | 2011-12-30 | 2012-07-11 | 华为技术有限公司 | Method and device for selecting interference cells |
| CN103701478A (en) * | 2012-09-27 | 2014-04-02 | 富士通株式会社 | Interference elimination device and receiver |
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Effective date of registration: 20210601 Address after: 100085 1st floor, building 1, yard 5, Shangdi East Road, Haidian District, Beijing Patentee after: DATANG MOBILE COMMUNICATIONS EQUIPMENT Co.,Ltd. Address before: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee before: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY |