WO2018149096A1 - Method and device for detecting data interference, and computer storage medium - Google Patents

Abstract

Disclosed is a method for detecting data interference, comprising: determining a subset of candidate interference resource blocks (RBs) at a target demodulation reference signal (DMRS) antenna port, and determining, in the subset of candidate interference RBs, an average interference-to-noise ratio and a full-bandwidth interference-to-noise ratio of all RBs at the antenna port; and comparing a linear ratio of the average interference-to-noise ratio and the full-bandwidth interference-to-noise ratio with a first preset threshold, and if the linear ratio is less than the first preset threshold, determining that the subset of candidate interference RBs experiences physical downlink shared channel (PDSCH) interference at the antenna port. Also disclosed is a device for detecting data interference.

Description

Method and device for detecting data interference, computer storage medium

Cross-reference to related applications

The present application is based on a Chinese patent application filed on Jan. 14, 2017, the entire disclosure of which is hereby incorporated by reference.

Technical field

The invention relates to a data interference detection technology, in particular to a data interference detection method and device, and a computer storage medium.

Background technique

With mobile users demand, high spectral efficiency is becoming one of the main requirements of mobile communications systems, in order to meet this demand, Third Generation Partnership Project ^{(3GPP, 3 rd Generation Partnership Project} ) LTE Advanced system (LTE -A Long Term Evolution Advanced) expects to use spectrum efficiency to provide more flexible spectrum management. For example, carrier aggregation/heterogeneous networks. The fundamental of this flexibility is to adopt a compact frequency reuse to improve the spectral efficiency of the multi-cell network, but this will result in strong cell interference at the cell edge, causing severe performance degradation. Therefore, Network Assisted Interference Cancellation and Suppression (NAICS) is the main technology enhancement and evolution of 3GPP LTE-A Release 12 to improve the performance of User Equipments (UEs).

Specifically, the NAICS receiver needs to perform explicit demodulation on the data of the interference source to cancel it out, and the UE needs to obtain parameter information of the PDCH (Physical Downlink Shared Channel) for further interference cancellation. (IC, Interference Cancellation) or Interference Suppression (IS). The parameters such as the transmission mode, the interference presence, the RI (Rank Indicator), and the modulation mode of the interfering PDSCH are obtained by the UE blindly detecting to reduce the constraint of the network scheduling and reduce the signaling overhead. The detection density is a frequency domain. A physical resource block (PRB) is a sub-frame in the time domain.

Transmission mode TM8/9 (Beamforming) based on UE-specific reference signals, for example, Demodulation Reference Signal (DMRS), which is usually determined by DMRS port detection in the prior art. Whether there is PDSCH interference on a certain DMRS port. For example, by comparing the interference power to noise power ratio (INR) and the preset threshold at the target DMRS port, if the INR is higher than the preset threshold, it indicates that there is PDSCH interference at the target DMRS port.

Since the detection density is a PRB in the frequency domain, the INR is calculated according to the PRB. The specific calculation formula is:

Where p is the antenna port, N _Rx is the number of receiving antennas, H _i is the neighboring channel estimate of the ith receiving antenna and the antenna port p on the kth PRB, and N ₀ is the noise variance.

The accuracy of the detection of this method depends entirely on the accuracy of the INR estimation. On the one hand, the channel estimation of the neighboring DMRS port is very high under the signal power to interference power plus noise power ratio (SINR). Inaccurate, resulting in an inaccurate INR estimate. 1a-1b are schematic diagrams of the estimated PRB-level INR expected value and the normalized variance NMSE of the receiving end when the transmitting end has interference with the antenna port 7; as shown in FIG. 1a-1b, the INR is set to 5 dB in the neighboring area. Antenna port 7 is not transmitted (see Figure 1a-1b)

As shown by the line, when there is no port7 interference, _PRB level INR7), when SINR=4dB, E(INR ₇ )=5.68dB, which is greater than the second preset threshold value of 0dB, which will cause neighboring antenna port 7 to interfere. Misdetection. On the other hand, since the DMRS scrambling code and the PDSCH are non-orthogonal, when the DMRS is not transmitted in the neighboring cell but the stronger PDSCH is transmitted, a stronger INR can still be detected at the DMRS position. 2a-2b are schematic diagrams of the estimated PRB-level INR expected value and NMSE of the receiving end when there is no antenna port 7 and 8 interference; as shown in FIG. 2a-2b, the INR is set to 13.91 dB, and the neighboring area is not transmitted. 7 and 8 (see Figure 2a-2b)

Line and

As shown by the line, when there is no port7 interference, _PRB level INR7 and no port8 interference _PRB level INR8), when SINR=-12~4dB,

It is greater than the second preset threshold value of 0 dB, which may cause false detection of interference of neighboring antenna ports 7 and 8, wherein E(·) indicates expectation.

It can be seen that determining whether the DMRS port has interference by comparing the INR at the target DMRS port with a certain threshold will result in erroneous detection of the number of ports.

Summary of the invention

In order to solve the existing technical problems, embodiments of the present invention are expected to provide a data interference detection method and apparatus, and a computer storage medium, which can greatly reduce the false positive probability of the number of DMRS ports.

The technical solution of the embodiment of the present invention is implemented as follows:

According to an aspect of the embodiments of the present invention, a method for detecting data interference is provided, where the method includes:

Determining a candidate interfering resource block RB subset on the target demodulation reference signal DMRS antenna port, and determining an interference-to-noise ratio average value and a full-bandwidth interference-to-noise ratio of all RBs on the antenna port in the candidate interfering RB subset ;

Comparing a linear ratio between the interference noise ratio average value and the full bandwidth interference noise ratio, and comparing with a first preset threshold value, when the linear ratio value is less than the first preset threshold value, determining The candidate interfering RB subset has interference of the physical downlink shared channel PDSCH on the antenna port.

In the above solution, the determining the candidate interference resource block RB subset on the target demodulation reference signal DMRS antenna port includes:

Determining a reference signal received power RSRP of each RB in the primary neighboring area on the antenna port And the noise variance value;

Dividing the RSRP from the noise variance value to obtain an interference noise power ratio INR of each RB;

Comparing the INR of each RB with a second preset threshold to obtain a comparison result of determining the candidate interfering RB subset on a downlink transmission bandwidth.

In the above solution, determining, in the candidate interfering RB subset, a full bandwidth interference-to-noise ratio of all RBs on the antenna port, including:

The RSRPs of all the RBs in the candidate interfering RB subset are coherently accumulated and averaged to obtain an average value after coherent accumulation;

Dividing the coherently accumulated average value by the noise variance value to obtain a full bandwidth interference-to-noise ratio of all RBs on the antenna port.

In the foregoing solution, the determining, by the average of the interference and noise ratios of all RBs on the antenna port, in the candidate interfering RB subset, includes:

The INRs of all the RBs in the candidate interfering RB subset are coherently accumulated and averaged to obtain an average of interference and noise ratios of all RBs on the antenna port.

In the above solution, after the determining that the candidate interference RB subset has interference of the PDSCH on the antenna port, the method further includes:

Determining the number of antenna ports on each RB in the candidate interfering RB subset;

Determining, according to the number of antenna ports, a number of layers in which the neighboring cell PDSCH exists in each RB in the candidate interfering RB subset.

According to another aspect of an embodiment of the present invention, a data interference detecting apparatus is provided, the apparatus comprising:

a first determining unit, configured to determine a candidate interfering RB subset on the target DMRS antenna port, and determine an interference-to-noise ratio average value and a full-bandwidth interference noise of all RBs on the antenna port in the candidate interfering RB subset Ratio

a second determining unit, configured to compare a linear ratio between the interference noise ratio average value and the full bandwidth interference noise ratio determined by the first determining unit, with a first preset threshold value, when When the linear ratio is smaller than the first preset threshold, determining that the candidate interfering RB subset has interference of the PDSCH on the antenna port.

In the above solution, the first determining unit is specifically configured to determine a reference signal received power RSRP and a noise variance value of each RB in the primary neighboring cell on the antenna port; and the RSRP and the noise variance The values are divided to obtain the INR of each RB; the INR of each RB is compared with a second preset threshold to obtain a comparison result of determining the candidate interfering RB subset on the downlink transmission bandwidth.

In the foregoing solution, the first determining unit is further configured to perform an average calculation on the RSRPs of all the RBs in the candidate interfering RB subset, and obtain an average value after the coherent accumulation; The value is divided by the noise variance value to obtain the full bandwidth interference-to-noise ratio of all RBs on the antenna port.

In the above solution, the first determining unit is further configured to perform an average calculation on the INRs of all the RBs in the candidate interfering RB subset, and obtain an interference-to-noise ratio average of all the RBs on the antenna port. .

In the above solution, the second determining unit is further configured to determine the number of antenna ports on each RB in the candidate interfering RB subset; and determine each RB in the candidate interfering RB subset according to the number of the antenna ports. There are layers on the PDSCH that interfere with the neighboring cell.

The first determining unit and the second determining unit may use a central processing unit (CPU), a digital signal processor (DSP, Digital Singnal Processor), or a programmable logic array (FPGA) when performing processing. Field-Programmable Gate Array) implementation.

Embodiments of the present invention also provide a computer storage medium in which computer executable instructions are stored, the computer executable instructions being configured to perform the above method of detecting data interference.

An embodiment of the present invention provides a method for detecting data interference, by determining a candidate interference RB subset on a target DMRS antenna port, and determining an interference-to-noise ratio of all RBs on the antenna port in the candidate interference RB subset. An average value and a full bandwidth interference to noise ratio; comparing a linear ratio between the interference noise ratio average value and the full bandwidth interference noise ratio to a first predetermined threshold value, when the linear ratio is less than the first When a preset threshold is determined, it is determined that the candidate interfering RB subset has interference of the PDSCH on the antenna port. In this way, after the candidate interfering RB subset at the target DMRS port is selected by the PRB-level INR for the first time, the expected value of the PRB-level INR for the second time is the linear ratio of the interference-to-noise ratio average to the full-bandwidth INR (eg, converted into dB, which should be the difference between the two, and compare with the preset threshold to determine whether the candidate candidate RB subset selected for the first time has interference at the target DMRS port, and can determine each resource block in the main neighboring area. After the number of DMRS ports, the number of layers of neighbor interference can be determined. The number of neighboring cell interference layers is equal to the number of DMRS ports, which greatly reduces the probability of misjudgment of data interference at the DMRS port.

DRAWINGS

FIG. 1a is a schematic diagram of an estimated PRB-level INR expected value of a receiving end when the transmitting end has interference with/without antenna port 7; FIG.

FIG. 1b is a schematic diagram of an NMSE estimated by the receiving end when the transmitting end interferes with/without the antenna port 7;

2a is a schematic diagram of the estimated PRB-level INR expected value of the receiving end when the transmitting end does not interfere with the antenna ports 7 and 8;

2b is a schematic diagram of the estimated NMSE of the receiving end when the transmitting end does not interfere with the antenna ports 7 and 8;

3 is a schematic flowchart of a method for detecting data interference according to an embodiment of the present invention;

4 is a schematic flowchart of determining whether an antenna port has beamforming Beamforming interference according to an embodiment of the present invention;

5 is a schematic flowchart of a blind detection process of a neighboring cell in a NAICS mode according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a device for detecting data interference according to an embodiment of the present invention.

detailed description

The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative and not restrictive.

FIG. 3 is a schematic flowchart of a method for detecting data interference according to an embodiment of the present invention; as shown in FIG. 3, the method includes:

Step 301: Determine a candidate interfering RB subset on the target DMRS antenna port, and determine an interference-to-noise ratio average value and a full-bandwidth interference-to-noise ratio of all RBs on the antenna port in the candidate interfering RB subset.

Here, the method is mainly applied to a device for detecting data interference. Specifically, the detecting apparatus first calculates a reference signal received power (RSRP, Reference Signal Received Power) and a noise variance value on each RB antenna port p in the primary neighboring area, and calculates the calculated RSRP and the The noise variance value is divided, and the interference noise power ratio INR of each RB is obtained, and the INR of each RB is compared with a second preset threshold to obtain the candidate interference on the downlink transmission bandwidth. Comparison of RB subsets. Then, the detecting device further performs the coherent accumulation of the RSRPs of all the RBs in the candidate interfering RB subset, and then averages the values after the coherent accumulation; and averages the values and the noise variance after the coherent accumulation The values are divided to obtain the full-bandwidth interference-to-noise ratio of all the RBs on the antenna port, and the INRs of all the RBs in the candidate interfering RB subset are coherently accumulated and averaged to obtain an interference-to-noise ratio average.

Here, since the R12NAICS receiver capability only needs to cancel a primary interfering neighbor, it is only necessary to blindly detect the parameters of a major interfering neighbor. Specifically, the cell search module (CSR, Cell Search and Reselection) in the LTE-A calculates the RSRP of each neighboring cell, and uses the neighboring cell with the largest RSRP value as the primary neighboring cell.

Step 302, a line between the interference noise ratio average value and the full bandwidth interference noise ratio a ratio of the ratio to the first preset threshold. When the linear ratio is smaller than the first preset threshold, determining that the candidate interfering RB subset has a physical downlink shared channel PDSCH on the antenna port. Interference.

Here, the detecting apparatus obtains an interference-to-noise ratio average value and a full-bandwidth interference-to-noise ratio of all RBs in the candidate interfering RB subset on the antenna port, and determines the interference-to-noise ratio average value and the full-bandwidth interference. The linear ratio between the noise ratios, for example, after converting the interference noise to the average and the full-bandwidth interference-to-noise ratio into dB, the difference between the two is calculated. Then, the calculated linear ratio is compared with the first preset threshold. When the linear ratio is smaller than the first preset threshold, it indicates that the detected RB in the candidate interfering RB subset does exist. The interference of the PDSCH on the antenna port; when the linear ratio is greater than or equal to the first preset threshold, it indicates that the RB detected in the candidate interfering RB subset does not have the interference of the PDSCH on the antenna port. . The implementation process of determining whether there is interference in the DMRS antenna port is shown in FIG. 4 .

4 is a schematic flowchart of determining whether an antenna port has beamforming Beamforming interference according to an embodiment of the present invention; as shown in FIG. 4:

First, the RSRP on each RB antenna port p of the primary neighbor is calculated. The RSRP of the kth RB output is recorded as RSRP _p (k); first k is reset to 0.

Then, the interference-to-noise ratio INR of each RB on the antenna port p is calculated, that is, the neighboring area RSRP on each RB is divided by the noise variance N ₀ to obtain the INR of the corresponding RB. The interference noise ratio of the kth RB is denoted as INR _p (k). The specific formula is as follows:

Then, by comparing the INR _p (k) with the second preset threshold Thr1, when the INR _p (k) is greater than Thr1, the RB k enters the candidate interfering RB subset {K _P } of the antenna port p, and then k= The calculation of k+1 calculates the RSRP of the next RB. When INR _p (k) is less than or equal to Thr1, indicating that RB k does not have neighboring PDSCH interference, the calculation of k=k+1 is directly performed to calculate the RSRP of the next RB. Then, determine if k is greater than or equal to

among them

Indicates the downlink transmission bandwidth; when k is greater than or equal to

When the RB indicating the entire transmission bandwidth has been traversed, the candidate interference RB subset at this time

The number of subsets is M _p . Calculating the full bandwidth interference-to-noise ratio INRFullBand on the antenna port p within the candidate interfering RB subset {K _P }, all of the subsets {K _p }

After coherent accumulation, the average is divided by the noise variance N ₀ to obtain the full bandwidth interference-to-noise ratio, labeled INRFullBand _p . The specific formula is as follows:

Then, the interference-to-noise ratio average value INRAuerage on the antenna port p is calculated in the candidate interfering RB subset {K _P }. Put all of the subset {K _p }

After the coherent accumulation, the average is recorded as NARAverage _p . The specific formula is as follows:

In the embodiment of the present invention, considering whether the PDSCH interference in the neighboring cell is a semi-static parameter, the forgetting filtering calculation is performed on the INRFullBand and the INRAverage of the current subframe and the previous subframe, that is, the INRFullBand _{p of} the nth subframe. And INRFullBand _{p are} specifically:

INRFullBand _p (n)=(1-α)·INRFullBand _p (n-1)+α·INRFullBand _p (n) (5);

INRAverage _p (n)=(1-α)·INRAverage _p (n-1)+α·INRAverage _p (n) (6);

Where α ≤ 1.0 is the forgetting filter factor.

Then, the linear ratio between the INRAverage _p (n) and the INRFullBand _p is determined. When the linear ratio is smaller than the first preset threshold Thr2, it indicates that the detected RB in the subset {K _p } does exist in the PDSCH antenna port. The interference of p; when the linear ratio is greater than or equal to the first preset threshold, it indicates that there is no PDSCH (Beamforming) interference in the subframe n. Here, the first preset threshold value should satisfy 2≤Thr2≤4, that is, 3dB≤10log10(Thr2)≤6dB.

After determining, by the detecting apparatus, that the RB has a interference of the PDSCH antenna port p in the candidate interfering RB subset, determining an antenna port on each RB in the candidate interfering RB subset And determining, according to the number of antenna ports, a number of layers of the interfering neighboring PDSCH on each RB in the candidate interfering RB subset. In particular, since the embodiment of the present invention is used in a NAICS receiver, the capability of the R12NAICS receiver is to interfere with the number of neighboring layers ≤ 2, so only the presence of antenna ports 7 and 8 needs to be detected. If an RB in the candidate interfering RB subset has interference of PDSCH antenna port 7 or 8, RI=1; if an RB has interference of antenna ports 7 and 8, it indicates that the RB has a dual stream with RI=2 Interference; if an RB does not have an antenna port 7 and there is no interference of the antenna port 8, it means that there is no PDSCH (Beamforming) interference in the RB.

Compared with the prior art, the method according to the embodiment of the present invention effectively solves the interference misjudgment caused by the inaccurate INR calculation under high SINR, and improves the interference presence and the number of layers in the neighboring area in the TM8/9 mode. The blind detection performance is also solved. In the neighboring area non-TM8/9 mode higher INR, the DMRS port can still detect a strong INR and cause DMRS port number misjudgment.

In the first embodiment of the present invention, FIG. 1 is taken as an example to describe how to improve the interference presence and layer number blind detection performance of the neighboring area in the TM8/9 mode. As shown in Figure 1:

In the LTE-A system, the serving cell system bandwidth is 10 MHz (downlink transmission bandwidth)

), full bandwidth allocation, transmission mode is TM9, RI=1; neighboring area 1 system bandwidth is 10MHz, full bandwidth allocation, transmission mode is TM9, RI=1, INR=5dB; neighboring area 2 system bandwidth is 10MHz, full bandwidth Allocation, transmission mode is TM9, RI=1, INR=0dB. The simulation results are shown in Figure 1.

As shown by the dashed line in Figure 1, when SINR=4dB, the estimated value of INR ₇ estimated by neighboring cell 1 without antenna port 7 is INRAverage ₇ = 5.68dB, normalized variance

Assumed that the second predetermined threshold value Thr = 0dB, the probability can be from about 80% to know the probability of INR _7> Thr1, i.e. a sub-frame 40 about the RB INR _7> Thr1, if only by PRB The INR is used to determine whether there is PDSCH interference at a certain DMRS port, and about 40 RBs may be erroneously detected as having interference with antenna port 7. at this time. If the candidate interfering RB subset at the target DMRS port is selected by the PRB-level INR for the first time, and then the second time passes the expected ratio of the PRB-level INR to the linear ratio of the full-bandwidth INR and the first preset threshold. For comparison, it is determined whether the candidate interfering RB subset selected for the first time has interference at the target DMRS port. That is, INRFullBand ₇ = -2.34dB (see Figure 1)

As shown by the line), INRAverage ₇ -INRFullBand ₇ = 8.02dB, which is greater than the maximum value of 6dB set by the preset threshold. The detected interference of antenna port 7 is not present in about 40 RBs, which greatly reduces the probability of false positives.

As shown by the solid color line in Figure 1, when SINR = 4 dB, the expected value of INR ₇ estimated by neighboring cell 1 with antenna port 7 interference is INRAverage ₇ = 7.39 dB, normalized variance

Assuming that Thr=0dB, it is known from the probability that there is about 86% probability INR ₇ >Thr1, that is, there are about 43 RBs in a subframe with INR ₇ >Thr1, if only by PRB level INR to determine in a certain DMRS If there is PDSCH interference in the port, about 43 RBs are detected as interference with antenna port 7. If at this time, according to the embodiment of the present invention, after the candidate interfering RB subset at the target DMRS port is selected by the PRB-level INR for the first time, the linear ratio of the expected value of the PRB-level INR to the full-bandwidth INR is obtained for the second time. The first preset threshold is compared to determine whether the candidate candidate RB subset selected for the first time has interference at the target DMRS port. That is, INRFullBand ₇ = 4.67dB (see Figure 1)

Line), INRAverage ₇ -INRFullBand ₇ = 2.72dB, which is less than the minimum value of 3dB set by the first preset threshold value, and the detected interference of antenna port 7 does exist in about 43 RBs.

Therefore, it can be seen that the method according to the present invention can effectively solve the misjudgment caused by the high INR calculation when there is no DMRS port interference when the neighboring area is in the TM8/9 mode.

In the second embodiment of the present invention, FIG. 2 is used as an example to describe how to solve the problem that the DMRS port number can be misjudged by detecting a strong INR at the DMRS port in the non-TM8/9 mode higher INR in the neighboring cell.

In the LTE-A system, the serving cell system bandwidth is 10 MHz (downlink transmission bandwidth)

), full bandwidth allocation, transmission mode is TM2, RI=1; neighboring system 1 system bandwidth is 10MHz, full bandwidth allocation, transmission mode is TM2, RI=1, INR=13.91dB; neighboring area 2 system bandwidth is 10MHz, all Bandwidth allocation, transmission mode is TM2, RI=1, INR=3.34dB. The simulation results are shown in Figure 2.

It can be seen from FIG. 2 that the estimated INR values of the antenna port 7 and the antenna port 8 are basically the same, and the NMSE and the INRFullBand are basically the same.

As shown by the solid color line in Figure 2, when SINR=-12dB, the expected value of INR7 estimated by neighboring cell 1 without antenna port 7 interference is INRAverage ₇ = 7.65dB, normalized variance

Assuming Thr = 0dB, the probability can be known from a 90% probability of about INR _7> Thr1, i.e. a sub-frame 45 about th RB INR of _7> Thr1, at this time, if only the PRB is determined by the level INR If there is PDSCH interference on a certain DMRS port, about 45 RBs are erroneously detected as interference with antenna port 7. If the candidate interfering RB subset at the target DMRS port is determined through the DMRS port, the linear ratio of the full bandwidth INR is compared with the preset threshold by the expected value of the PRB-level INR, and the first selected candidate is determined. Whether there is target DMRS interference in the interfering RB subset, ie INRfullBand ₇ =-0.32dB (see Figure 3)

Line), INRAverage ₇ -INRFullBand ₇ =7.97dB, greater than the maximum value of 6dB set by the preset threshold, the detected interference of antenna port 7 is not present in about 45 RBs, that is, there is no antenna in the entire system bandwidth Interference from port 7.

Similarly, with the method of the present invention, there is no interference of the antenna port 8 in the entire system bandwidth. Effectively solve the problem that the DMRS port number can be misjudged by detecting a strong INR at the DMRS port with a higher INR in the non-TM8/9 mode in the neighboring cell.

Embodiment 3 of the present invention provides a detailed description of the application of the present invention to an LTE-A NAICS receiver by way of a specific example.

Assume that in the LTE-A TDD system, N _Rx = 2, and the serving cell system bandwidth is 10 MHz (downlink transmission bandwidth)

), Normal cyclic prefix (NCP), the uplink and downlink configuration is 1, the special subframe configuration is 4, the transmission mode is TM9, RI=1; the neighboring system 1 system bandwidth is 10MHz, the NCP, the uplink and downlink configuration is 1, special subframe Configured as 4, the transmission mode is TM9, RI=2, the transmission mode detection subset TM{2,3,4,8,9} given by the high-level signaling, INR1=13.91dB; the neighboring area 2 system bandwidth is 10MHz, NCP, the uplink and downlink configuration is 1, the special subframe configuration is 4, the transmission mode is TM9, RI=1, INR2=3.34dB;

Let the received signal on the mth subcarrier of the lth OFDM symbol of the ith receiving antenna be: Y _i (l, m) = H _i0 (l, m) X (l, m) + H' _i0 (l, m ) X' ₀ (l,m)+H' _i1 (l,m)X' ₁ (l,m)+H"' _i0 (l,m)X"(l,m)+N ₀ (l,m) (7);

Wherein X (l, m) to transmit signals of a serving _{cell, X '0 (l, m} ) is the transmit signal neighboring antenna port _{7, X' 1 (l, m} ) for the neighboring antenna port transmits 8 The signal, X′′(l,m) is the transmitted signal of the neighboring cell 2; H _i0 (1,m) is the equivalent channel frequency domain response of the 0th transmitting antenna of the ith receiving antenna of the serving cell (channel frequency domain response multiplication) In the precoding matrix), H' _i0 is the equivalent channel frequency domain response of the 0th transmitting antenna of the ith receiving antenna of the neighboring cell 1, H' _i1 is the first transmitting antenna of the ith receiving antenna of the neighboring cell 1 Effective channel frequency domain response; H′′ _i0 is the equivalent channel frequency domain response of the 0th transmitting antenna of the ith receiving antenna of the neighboring area 2; N ₀ (l, m) is the complex AWGN, and both the real part and the imaginary part are satisfied.

distributed.

Since the NAICS receiver mainly eliminates the interference of the strong neighboring cell to the serving cell, it is necessary to perform blind parameter detection on the neighboring cell 1, and the specific process is shown in FIG. 5;

FIG. 5 is a schematic diagram of a blind detection process of a neighboring cell parameter in a NAICS mode according to an embodiment of the present invention; as shown in FIG. 5, the following steps are included:

In step 501, the physical layer software determines whether it is the NAICS mode.

Here, after determining that the current data transmission mode is the NAICS mode, step 502 is performed.

Step 502: The physical layer software determines whether the cell is in the TM8/9 mode.

Here, after determining that the current cell is in the TM8/9 mode, step 503 is performed, otherwise step 510 is performed.

Step 503, receiving a signal Y;

Step 504, the reconstructed neighboring area receives the signal Y1 at the DMRS;

Here, the DMRS on each OFDM symbol is extracted by the detecting device, and the DMRS subcarrier set on the 1st subcarrier is set to {PilotSubcarrier}, and the DMRS OFDM on the mth subcarrier is set. The symbol set is {PilotSymbol}. Because the transmission mode of the serving cell in this example is TM9, in order to improve the blind detection performance, the IC needs to remove the signal at the DMRS resource location of the local cell to reconstruct the neighboring cell received signal, that is, the received signal minus the serving cell channel estimate multiplied by the DMRS interference of the cell. The code, the neighboring region received signal reconstructed on the 1st OFDM symbol is as follows:

_{Y1 i (l, m) =} Y i (l, m) -H i0 (l, m) X (l, m), m∈ {PilotSubcarrier} (8);

Step 505, the TM8/9 scrambling code identification number is blindly detected;

Here, after the detection device performs blind detection of the scrambling code identification number n _SCID , the scrambling code of the antenna port 7 of the adjacent area 1 is recorded as S ₇ (l, m), and Y1 _i (l, m) is conjugate multiplied to obtain The result after descrambling is denoted as R _i (l, m); the specific formula is as follows:

R _i (l,m)=Y1 _i (l,m)·S ₇ *(l,m) (9);

Step 506, TM8/9 interference presence and layer number detection;

Here, the detecting means further calculates the reference signal received power RSRP separated by the antenna ports 7 and 8 on each RB according to R _i (1, m). For NCP, there are DM RSs on the m (m∈{PilotSubCarrier}) subcarriers in 4 subframes in one subframe, denoted as R _i (l ₀ , m), R _i (l ₁ , m), R _i (l ₂ , m), R _i (l ₃ , m); on the 1st (1 ∈ {PilotSymbol}) OFDM symbol, there are DM RSs on 3 subcarriers in one RB, which is denoted as R _i (l, m ₀ ), R _i (l, m ₁ ), R _i (l, m ₂ ); the RSRP calculation formula of the kth RB is as follows:

Then, the detecting means calculates the interference-to-noise ratios INR ₇ and INR ₈ of each RB on the antenna ports 7 and 8 according to the formula (2).

The detecting device compares the INR and the threshold Thr1 by the downlink transmission bandwidth

Find the candidate interfering RB subsets on antenna ports 7 and 8, ie

with

The number of subsets is M ₇ and M _{8 , respectively} .

The detecting means then calculates the full bandwidth interference noise ratios INRFullBand ₇ and INRFullBand ₈ on antenna ports 7 and 8 in the candidate interfering RB subset {K ₇ } and {K ₈ } subsets according to equation (3).

The detecting means calculates antenna port 7 and 8 interference noise ratio average values INRAverage ₇ and INRAverage ₈ in the candidate interference RB subsets {K ₇ } and {K ₈ } according to formula (4).

The detecting means further performs a forgetting filtering calculation on INRFullBand ₇ and INRFullBand ₈ , INRAverage ₇ and INRAverage ₈ according to formulas (5), (6), wherein the forgetting factor α is set to 0.1.

Then, the detection device determines YRAverage ₇ <Thr2·INRFullBand ₇ , where 2≤Thr2≤4, and if so, indicates that the detected RB in the subset {K ₇ } has interference of the PDSCH antenna port 7, and the RI at this time =1; otherwise, it means that there is no interference of PDSCH antenna port 7 in the entire transmission bandwidth. Re-determine the INRAverage ₈ <Thr2·INRFullBand ₈ , if yes, it indicates that the RB detected in the subset {K ₈ } has interference of the PDSCH antenna port 8, and RI=1; if otherwise, the PDSCH antenna does not exist in the entire transmission bandwidth. Port 8 interference. If an RB has both antenna port 7 interference and antenna port 8 interference, it indicates that the RB has dual stream interference with RI=2.

Step 507, is the neighboring area TM8/9 mode?

Here, according to the detection result of step 506, it is determined that there is PDSCH (Beamforming) interference in the candidate interfering RB, and then directly proceeds to step 508 to perform blind modulation detection; if it is not determined in step 506 that there is PDSCH (Beamforming) interference, Proceeding to step 509, TM{2, 3, 4} blind detection is performed.

Step 508, the neighboring area modulation mode is blindly detected;

Step 509, instructing the hardware to exit the NAICS mode;

Step 510, receiving a signal Y;

Step 511, the TM8/9 scrambling code identification number is blindly detected;

Step 512, TM8/9 interference presence and layer number detection;

Step 513, is the neighboring area TM8/9 mode?

Here, when it is determined that the neighboring cell is in the TM8/9 mode, step 514 is performed, otherwise step 515 is performed.

Step 514, the neighboring area modulation mode is blindly detected;

Step 515, the TM2/3/4 mode is blindly detected.

In this way, the interference erroneous judgment caused by the inaccurate INR calculation at high SINR can be effectively solved, and the blind detection performance of the neighboring area in the TM8/9 mode interference presence and the number of layers is improved; and the non-TM8/9 in the neighboring area is also solved. In a higher INR mode, a stronger INR can still be detected at the DMRS port, causing a misjudgment of the number of DMRS ports.

FIG. 6 is a schematic structural diagram of a data interference detecting apparatus according to an embodiment of the present invention. As shown in FIG. 6, the apparatus includes: a first determining unit 601 and a second determining unit 602, where

The first determining unit 601 is configured to determine a candidate interfering RB subset on the target DMRS antenna port, and determine an interference noise ratio average and total of all RBs on the antenna port in the candidate interfering RB subset Bandwidth interference noise ratio;

The second determining unit 602 is configured to compare a linear ratio between the interference noise ratio average value and the full bandwidth interference noise ratio determined by the first determining unit 601, and a first preset threshold value. And determining, when the linear ratio is smaller than the first preset threshold, that the candidate interference RB subset has interference of a PDSCH on the antenna port.

Here, first, the first determining unit 601 determines a reference signal received power RSRP and a noise variance value of each RB in the primary neighboring cell on the antenna port; dividing the RSRP by the noise variance value Obtaining an INR for each RB; comparing the INR of each RB with a second preset threshold to obtain a comparison result of determining the candidate interfering RB subset on a downlink transmission bandwidth. Then, the first determining unit 601 performs the coherent accumulation of the RSRPs of all the RBs in the candidate interfering RB subset, and then averages the values, and obtains the average value after the coherent accumulation; and the average value and the noise side after the coherent accumulation The difference is divided to obtain a full bandwidth interference-to-noise ratio of all RBs on the antenna port; then, the first determining unit 601 performs coherent accumulation of all RBs in the candidate interfering RB subset, and then averages Obtain an average of the interference-to-noise ratio of all RBs on the antenna port. Finally, the first determining unit is configured by the second determining unit 602 a linear ratio between the interference noise ratio average value and the full bandwidth interference noise ratio determined by 601, compared with a first preset threshold value, when the linear ratio is less than the first preset threshold value Determining that the candidate interfering RB subset has interference of the PDSCH on the antenna port. The implementation process of determining whether there is interference in the DMRS antenna port is shown in FIG. 4 .

In the embodiment of the present invention, the second determining unit 602 is further configured to determine the number of antenna ports on each RB in the candidate interfering RB subset; and determine the candidate interfering RB subset according to the number of the antenna ports. There are layers on each RB that interfere with the neighboring cell PDSCH.

Specifically, after the first determining unit 601 determines that there is interference of the RB in the candidate interfering RB subset in the PDSCH antenna port p, the second determining unit 602 determines, in the candidate interfering RB subset, The number of antenna ports on the RBs; and determining the number of layers of the interfering neighboring PDSCHs on each RB in the candidate interfering RB subset according to the number of the antenna ports. Specifically, if there is interference of PDSCH antenna port 7 or 8 in a certain RB in the candidate interference RB subset, RI=1; if an RB has interference of antenna ports 7 and 8, it indicates that the RB has RI= 2, the dual-stream interference; if an RB does not exist in the antenna port 7 and there is no interference of the antenna port 8, it means that there is no PDSCH (Beamforming) interference in the RB.

Compared with the prior art, the method according to the embodiment of the present invention effectively solves the interference misjudgment caused by the inaccurate calculation of the INR under high SINR, and improves the interference presence and the number of layers in the adjacent region in the TM8/9 mode. The detection performance is also solved. In the neighboring area non-TM8/9 mode higher INR, the DMRS port can still detect a strong INR and cause the DMRS port number to be misjudged.

Embodiments of the present invention also provide a computer storage medium in which computer executable instructions are stored, the computer executable instructions being configured to perform the above method of detecting data interference.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware. Moreover, the present invention may employ computer-usable storage media (including but not limited to disks) in one or more of the computer-usable program code embodied therein. A form of computer program product embodied on a memory and optical storage, etc.).

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Industrial applicability

The embodiment of the present invention determines a candidate interference RB subset on a target DMRS antenna port, and determines an interference noise ratio average value and a full bandwidth interference noise of all RBs on the antenna port in the candidate interference RB subset. Comparing a linear ratio between the interference noise ratio average value and the full bandwidth interference noise ratio, compared to a first predetermined threshold value, when the linear ratio is When the first preset threshold is smaller than the first preset threshold, it is determined that the candidate interference RB subset has interference of the PDSCH on the antenna port. In this way, after the candidate interfering RB subset at the target DMRS port is selected by the PRB-level INR for the first time, the expected value of the PRB-level INR for the second time is the linear ratio of the interference-to-noise ratio average to the full-bandwidth INR (eg, converted into dB, which should be the difference between the two, and compare with the preset threshold to determine whether the candidate candidate RB subset selected for the first time has interference at the target DMRS port, so that each resource block in the primary neighbor can be determined. After the number of DMRS ports is up, the number of layers of neighbor interference can be determined. Because the number of neighboring interference layers is equal to the number of DMRS ports, the probability of misjudgment of data interference at the DMRS port can be greatly reduced.

Claims (11)

1. A method for detecting data interference, the method comprising:

   Determining a candidate interfering resource block RB subset on the target demodulation reference signal DMRS antenna port, and determining an interference-to-noise ratio average value and a full-bandwidth interference-to-noise ratio of all RBs on the antenna port in the candidate interfering RB subset ;

   Comparing a linear ratio between the interference noise ratio average value and the full bandwidth interference noise ratio, and comparing with a first preset threshold value, when the linear ratio value is less than the first preset threshold value, determining The candidate interfering RB subset has interference of the physical downlink shared channel PDSCH on the antenna port.
2. The method of claim 1, wherein the determining a candidate interference resource block RB subset on the target demodulation reference signal DMRS antenna port comprises:

   Determining a reference signal received power RSRP and a noise variance value of each RB in the primary neighboring cell on the antenna port;

   Dividing the RSRP from the noise variance value to obtain an interference noise power ratio INR of each RB;

   Comparing the INR of each RB with a second preset threshold to obtain a comparison result of determining the candidate interfering RB subset on a downlink transmission bandwidth.
3. The method of claim 1, wherein the determining a full bandwidth interference to noise ratio of all RBs on the antenna port within the candidate interfering RB subset comprises:

   The RSRPs of all the RBs in the candidate interfering RB subset are coherently accumulated and averaged to obtain an average value after coherent accumulation;

   Dividing the coherently accumulated average value by the noise variance value to obtain a full bandwidth interference-to-noise ratio of all RBs on the antenna port.
4. The method of claim 1, wherein the determining an interference-to-noise ratio average of all RBs on the antenna port within the candidate interfering RB subset comprises:

   The INRs of all the RBs in the candidate interfering RB subset are coherently accumulated and averaged to obtain an average of interference and noise ratios of all RBs on the antenna port.
5. The method of claim 1, wherein after the determining that the candidate interfering RB subset has interference of the PDSCH on the antenna port, the method further comprises:

   Determining the number of antenna ports on each RB in the candidate interfering RB subset;

   Determining, according to the number of antenna ports, a number of layers in which the neighboring cell PDSCH exists in each RB in the candidate interfering RB subset.
6. A device for detecting data interference, the device comprising:

   a first determining unit, configured to determine a candidate interfering RB subset on the target DMRS antenna port, and determine an interference-to-noise ratio average value and a full-bandwidth interference noise of all RBs on the antenna port in the candidate interfering RB subset ratio;

   a second determining unit, configured to compare a linear ratio between the interference noise ratio average value and the full bandwidth interference noise ratio determined by the first determining unit, with a first preset threshold value, when When the linear ratio is smaller than the first preset threshold, determining that the candidate interfering RB subset has interference of the PDSCH on the antenna port.
7. The apparatus according to claim 6, wherein the first determining unit is specifically configured to determine a reference signal received power RSRP and a noise variance value of each RB in the primary neighboring cell on the antenna port; The RSRP is divided by the noise variance value to obtain an INR of each RB; the INR of each RB is compared with a second preset threshold to obtain the candidate interference RB sub-determined on the downlink transmission bandwidth. The result of the comparison.
8. The apparatus according to claim 6, wherein the first determining unit is further configured to perform an average calculation of the RSRPs of all the RBs in the candidate interfering RB subset after the coherent accumulation, to obtain a value after the coherent accumulation; Dividing the coherently accumulated average value by the noise variance value to obtain a full bandwidth interference-to-noise ratio of all RBs on the antenna port.
9. The apparatus according to claim 6, wherein said first determining unit is specifically provided The INRs of all the RBs in the candidate interfering RB subset are coherently accumulated and averaged to obtain an average of interference and noise ratios of all RBs on the antenna port.
10. The apparatus according to claim 6, wherein the second determining unit is further configured to determine an antenna port number on each RB in the candidate interfering RB subset; and determine the candidate interference according to the number of antenna ports Each RB in the RB subset has a number of layers that interfere with the neighboring cell PDSCH.
11. A computer storage medium having stored therein computer executable instructions configured to perform the method of detecting data interference according to any of claims 1-5.

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