CN111385041B - Method and device for measuring interference noise intensity and storage medium - Google Patents
Method and device for measuring interference noise intensity and storage medium Download PDFInfo
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- CN111385041B CN111385041B CN201811621048.9A CN201811621048A CN111385041B CN 111385041 B CN111385041 B CN 111385041B CN 201811621048 A CN201811621048 A CN 201811621048A CN 111385041 B CN111385041 B CN 111385041B
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Abstract
The present invention relates to the field of communications, and in particular, to a method and an apparatus for measuring interference noise intensity, and a storage medium. The method is used for effectively improving the measurement accuracy of the interference signal strength, and comprises the following steps: and the eNodeB calculates a leading index according to the root sequence index and the detection window index, judges whether the leading index is read by the UE or not, obtains a first judgment result, judges whether the detection window index is equal to a preset detection window index threshold or not, obtains a second judgment result, further calculates a first interference noise intensity corresponding to the detection window index according to the leading index, and calculates a second interference noise intensity of the PRACH based on the first interference noise intensity. Therefore, the eNodeB can directly detect the interference noise intensity of the PRACH accessed by the UE, the process of channel estimation of the PRACH is omitted, the measurement steps are simplified, the complexity of the measurement process is reduced, the measurement precision is improved, and the practicability and effectiveness of the measurement method are further ensured.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for measuring interference noise intensity, and a storage medium.
Background
The interference noise level in a communication system refers to all non-useful signals entering the channel or communication system. The non-useful signals include signals external to the communication system, such as environmental noise and spurious interference, and signals internal to the communication system, such as intersymbol interference and adjacent cell interference. These non-useful signals enter the channel of the receiving device through direct coupling or indirect coupling, which affects the electromagnetic energy of the communication system, and further affects the received signals of the communication system, resulting in performance degradation, quality deterioration, information error or loss of the communication system, and even blocking the normal communication between the two parties. Moreover, based on the detected interference noise intensity, the techniques of scheduling, power control, adaptive coding modulation and the like of a Long Term Evolution (LTE) base station (eNodeB) can be realized, and therefore, the measurement of the interference noise intensity is an important link in the receiving technology of the communication system.
In the prior art, the interference noise strength is detected based on a Channel estimation process, for an LTE uplink service Channel, Channel estimation is a necessary process for receiver processing, but for a Physical Random Access Channel (PRACH) of LTE, a peak detection process is completed based on a time domain correlation sequence, and a Channel estimation process is not required, so that the processing process is complicated, and unnecessary resource waste is caused.
In addition, noise power estimation based on peak detection belongs to interference noise intensity pre-estimation, the measurement error is large, and under the condition of wireless channel propagation with abundant multipath reflection, the algorithm is very easy to introduce signal multipath components, so that the interference noise intensity measurement value is higher, and the detection precision of the interference noise intensity is reduced.
Therefore, it is necessary to design a method for measuring the interference noise intensity to solve the above problems.
Disclosure of Invention
The invention aims to provide a method and a device for measuring the intensity of interference noise so as to effectively improve the measurement accuracy of the intensity of an interference signal.
A method for measuring interference noise strength, comprising:
calculating a corresponding preamble index according to a root sequence index and a detection window index carried in cell broadcast information, and judging whether the preamble index is read by User Equipment (UE) to obtain a first judgment result, wherein the root sequence index and the detection window index are used for determining a Physical Random Access Channel (PRACH) which can be used by a cell;
when the leading index is determined to be read by the UE according to the first judgment result, further judging whether the detection window index is equal to a preset detection window index threshold value or not, and obtaining a second judgment result;
and when determining that the detection window index is equal to the detection window index threshold value according to the second judgment result, calculating a first interference noise intensity corresponding to the detection window index according to the leading index, and further when determining that the root sequence index is equal to a preset root sequence index threshold value, calculating a second interference noise intensity of the PRACH based on the first interference noise intensity.
Optionally, before calculating a corresponding preamble index according to a root sequence index and a detection window index carried in cell broadcast information, and determining whether the preamble index is read by the UE, and obtaining a first determination result, the method further includes:
receiving a PRACH signal sent by UE, demodulating the PRACH signal, and transforming the PRACH signal from a time domain to a frequency domain;
performing sequence correlation on the PRACH signal on a frequency domain, and obtaining a time domain correlation power sequence;
and detecting the peak value of the time domain related power sequence and judging whether the UE is accessed to the PRACH.
Optionally, when determining that the preamble index is read by the UE according to the first determination result, the method specifically includes:
and when the UE is determined to select the leading index to access the corresponding PRACH according to the first judgment result, determining that the leading index is read by the UE, and setting all noise window counters in the current detection window to be 0.
Optionally, further comprising:
and when the leading index is determined not to be read by the UE according to the first judgment result, adding 1 to all noise window counters in the current detection window.
Optionally, when it is determined that the detection window index is equal to the detection window index threshold according to the second determination result, calculating a first interference noise intensity corresponding to the detection window index according to the preamble index, specifically including:
when the detection window index is determined to be equal to the detection window index threshold value according to the second judgment result, performing signal sampling on a PRACH (physical random access channel) accessed by the UE, and calculating the power of each sampling point;
and calculating to obtain a first interference noise intensity corresponding to the detection window index according to the sampling power of each sampling point, the current value of the noise window counter, the detection window index threshold value and a preset first interference noise intensity initial value.
Optionally, when it is determined that the root sequence index is equal to a preset root sequence index threshold, calculating a second interference noise strength of the PRACH based on the first interference noise strength, specifically including:
and when the root sequence index is determined to be equal to a preset root sequence index threshold, calculating to obtain a second interference noise strength of the PRACH according to the first interference noise strength and the root sequence index threshold.
An interference noise strength measuring device, optionally comprising:
a first judging unit, configured to calculate a corresponding preamble index according to a root sequence index and a detection window index carried in cell broadcast information, and judge whether the preamble index is read by a user equipment UE, to obtain a first judgment result, where the root sequence index and the detection window index are used to determine a physical random access channel PRACH that can be used by a cell;
a second determining unit, configured to further determine whether the detection window index is equal to a preset detection window index threshold when it is determined that the preamble index is read by the UE according to the first determination result, so as to obtain a second determination result;
and a calculating unit, configured to calculate, when it is determined that the detection window index is equal to the detection window index threshold according to the second determination result, a first interference noise strength corresponding to the detection window index according to the preamble index, and further calculate, when it is determined that the root sequence index is equal to a preset root sequence index threshold, a second interference noise strength of the PRACH based on the first interference noise strength.
Optionally, before calculating a corresponding preamble index according to a root sequence index and a detection window index carried in cell broadcast information, and determining whether the preamble index is read by the UE, and obtaining a first determination result, the first determining unit is further configured to:
receiving a PRACH signal sent by UE, demodulating the PRACH signal, and transforming the PRACH signal from a time domain to a frequency domain;
performing sequence correlation on the PRACH signal on a frequency domain, and obtaining a time domain correlation power sequence;
and detecting the peak value of the time domain related power sequence and judging whether the UE is accessed to the PRACH.
Optionally, when it is determined that the preamble index is read by the UE according to the first determination result, the second determining unit is specifically configured to:
and when the UE is determined to select the leading index to access the corresponding PRACH according to the first judgment result, determining that the leading index is read by the UE, and setting all noise window counters in the current detection window to be 0.
Optionally, the second determining unit is further configured to:
and when the leading index is determined not to be read by the UE according to the first judgment result, adding 1 to all noise window counters in the current detection window.
Optionally, when it is determined that the detection window index is equal to the detection window index threshold according to the second determination result, the calculation unit is specifically configured to calculate a first interference noise intensity corresponding to the detection window index according to the preamble index, where:
when the detection window index is determined to be equal to the detection window index threshold value according to the second judgment result, performing signal sampling on a PRACH (physical random access channel) accessed by the UE, and calculating the power of each sampling point;
and calculating to obtain a first interference noise intensity corresponding to the detection window index according to the sampling power of each sampling point, the current value of the noise window counter, the detection window index threshold value and a preset first interference noise intensity initial value.
Optionally, when it is determined that the root sequence index is equal to a preset root sequence index threshold, calculating a second interference noise strength of the PRACH based on the first interference noise strength, where the calculating unit is specifically configured to:
and when the root sequence index is determined to be equal to a preset root sequence index threshold, calculating to obtain a second interference noise strength of the PRACH according to the first interference noise strength and the root sequence index threshold.
A storage medium, optionally storing a program for implementing a method for measuring interference noise strength, which program, when executed by a processor, performs the steps of:
calculating a corresponding preamble index according to a root sequence index and a detection window index carried in cell broadcast information, and judging whether the preamble index is read by User Equipment (UE) to obtain a first judgment result, wherein the root sequence index and the detection window index are used for determining a Physical Random Access Channel (PRACH) which can be used by a cell;
when the leading index is determined to be read by the UE according to the first judgment result, further judging whether the detection window index is equal to a preset detection window index threshold value or not, and obtaining a second judgment result;
and when determining that the detection window index is equal to the detection window index threshold value according to the second judgment result, calculating a first interference noise intensity corresponding to the detection window index according to the leading index, and further when determining that the root sequence index is equal to a preset root sequence index threshold value, calculating a second interference noise intensity of the PRACH based on the first interference noise intensity.
A communications apparatus, optionally, comprising one or more processors; and one or more computer-readable media having instructions stored thereon, which when executed by the one or more processors, cause the apparatus to perform the method of any of the above.
In summary, in the embodiment of the present invention, the eNodeB calculates the preamble index according to the root sequence index and the detection window index, determines whether the preamble index is read by the UE, obtains a first determination result, determines whether the detection window index is equal to a preset detection window index threshold, obtains a second determination result, further calculates a first interference noise strength corresponding to the detection window index according to the preamble index, and calculates a second interference noise strength of the PRACH based on the first interference noise strength. Therefore, the eNodeB can directly detect the interference noise intensity of the PRACH accessed by the UE, the process of channel estimation of the PRACH is omitted, the measurement steps are simplified, the complexity of the measurement process is reduced, the measurement precision is improved, and the practicability and effectiveness of the measurement method are further ensured.
Drawings
FIG. 1 is a schematic flow chart illustrating a method for measuring interference noise strength according to an embodiment of the present invention;
FIG. 2 is a detailed flow chart illustrating the processing of the interference noise level according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an eNodeB functional structure according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the embodiment of the present invention, referring to fig. 1, the process of measuring the interference noise intensity is as follows:
step 100: the eNodeB calculates a corresponding preamble index according to a root sequence index and a detection window index carried in cell broadcast information, and determines whether the preamble index is read by a User Equipment (UE) to obtain a first determination result, where the root sequence index and the detection window index are used to determine a Physical Random Access Channel (PRACH) that can be used by a cell.
Specifically, in the embodiment of the present invention, after receiving a PRACH signal sent by a UE and sequentially performing signal demodulation, sequence correlation, and peak detection on the PRACH signal, a root sequence index rootsequencentensindex, a first interference noise strength PowerForNI, a detection window index WindowIndex, and a noise window counter are initialized, that is, the initialized rootsequencentensindex is 0, PowerForNI is 0, windowlndex is 0, and WinCounter is 0, and further, the eNodeB calculates and obtains a corresponding PreambleIndex based on the root sequence index and the detection window index carried in cell broadcast information, and determines whether the PreambleIndex is read by the UE, to obtain a corresponding first determination result, where the PRACH may be uniquely determined by the root sequence index and the detection window index.
Step 110: and when the eNodeB determines that the leading index is read by the UE according to the first judgment result, further judging whether the detection window index is equal to a preset detection window index threshold value or not, and obtaining a second judgment result.
Specifically, in the embodiment of the present invention, when the eNodeB determines that the preambelndex is read by the UE according to the first determination result, it determines that the UE selects the preambelndex to access the corresponding PRACH, so that all noise window counters in the current detection window are set to 0, that is, WinCounter is 0, where WinCounter represents a value taken by a noise window calculator. Then, the eNodeB further determines whether the WindowIndex is equal to a preset detection window index threshold, that is, determines whether the WindowIndex is equal to floor (N)zc/Ncs) -1, obtaining a corresponding second determination result, wherein NzcIs the length of the preamble sequence of PRACH, NcsIs the cyclic shift value of the PRACH leader sequence, and is not less than 0 and not more than windowIndex not more than floor (N)zc/Ncs)-1。
Step 120: and when the eNodeB determines that the detection window index is equal to the detection window index threshold value according to the second judgment result, calculating a first interference noise intensity corresponding to the detection window index according to the leading index.
Specifically, in this embodiment of the present invention, the eNodeB determines that the WindowIndex is equal to floor (N) according to the second determination resultzc/Ncs) -1, calculating a first interference noise intensity corresponding to the WindowIndex according to the preamblelndex, specifically, performing signal sampling on a PRACH channel accessed by the UE, calculating power of each sampling point, and calculating a first interference noise intensity corresponding to the detection window index according to the sampling power of each sampling point, a current value of a noise window counter, the detection window index threshold and a preset first interference noise intensity initial value, that is, PowerForNI ═ PowerForNI0(sum of all sample point powers)/WinCounter (floor (N)zc/Ncs) B) 6, wherein PowerForNI0Denotes the initial value of PowerForNI, WinCounter denotes the noise window calculator value, NzcIs the length of the preamble sequence of PRACH, NcsIs a cyclic shift value of a preamble sequence of the PRACH.
Step 130: and when the eNodeB further determines that the root sequence index is equal to a preset root sequence index threshold value, calculating to obtain a second interference noise strength of the PRACH based on the first interference noise strength.
Specifically, in the embodiment of the present invention, after the eNodeB calculates PowerForNI corresponding to the WindowIndex according to preambeindex, the eNodeB determines whether the rootsequence index is equal to a preset root sequence index threshold, that is, determines whether the rootsequence index is equal to Ceil (64/floor (N/floor)zc/Ncs) -1, when it is determined that the rootsequence index is equal to Ceil (64/floor (N)zc/Ncs) -1, determining the rootsequence index at this time as the last root sequence of the PRACH signal detection, and averaging PowerForNI among a plurality of root sequences, specifically, the second interference noise strength of the PRACH is equal to the first interference noise strength divided by a root sequence index threshold, that is, the second interference noise strength is PowerForNI/Ceil (64/floor (N/floor))zc/Ncs))。
In the embodiment of the present invention, referring to fig. 2, a detailed flow of the eNodeB processing the interference noise strength is as follows:
step 200: the eNodeB receives the PRACH signal transmitted by the UE and performs signal demodulation on the PRACH signal.
Specifically, in the embodiment of the present invention, after receiving a PRACH signal sent by a UE, an eNodeB first demodulates the PRACH signal, that is, converts the PRACH signal from a time domain to a frequency domain by a discrete Fourier transform (FFT), and performs time-frequency resource mapping according to a time-frequency resource location of the PRACH signal.
Step 201: the eNodeB performs sequence correlation on the demodulated PRACH signal.
Specifically, in the embodiment of the present invention, after demodulating the PRACH signal, the eNodeB correlates the sequence of the PRACH signal in the frequency domain to obtain the time domain correlation power sequence.
Step 202: and the eNodeB carries out peak detection on the time domain related power sequence.
Specifically, in the embodiment of the present invention, after performing signal demodulation and sequence correlation on the PRACH signal, the eNodeB obtains a time domain correlation power sequence, and detects a peak value of the time domain correlation power sequence, thereby completing interference noise power estimation, peak power calculation, and multi-antenna power summation.
Step 203: the eNodeB initializes a root sequence index and a first interference noise strength.
Specifically, in the embodiment of the present invention, the eNodeB notifies the UE of a root sequence index that can be used by a PRACH of the cell through a cell broadcast message, and further, the eNodeB initializes the root sequence index rootsequencentensindex and PowerForNI by setting the root sequence index rootsequencentensindex and the first interference noise strength PowerForNI to zero, that is, the initialized rootsequencentensindex is 0 and the PowerForNI is 0.
Step 204: the eNodeB initializes the detection window index and the noise window counter.
Specifically, in the embodiment of the present invention, the eNodeB notifies the UE of the detection window index that can be used by the PRACH of the cell through the cell broadcast message, and further, the eNodeB initializes the WindowIndex and the windowcounter by setting the detection window index WindowIndex and the noise window counter WinCounter to zero, that is, the initialized WindowIndex is 0 and the windowcounter is 0.
Step 205: the eNodeB calculates a corresponding preamble index according to a root sequence index and a detection window index carried in cell broadcast information, and determines whether the preamble index is read by the UE, to obtain a first determination result, where the root sequence index and the detection window index are used to determine a PRACH that can be used by the cell, if so, execute step 206, and otherwise, execute step 207.
Specifically, in the embodiment of the present invention, the eNodeB may determine the PRACH that the UE can use through the root sequence index and the detection window index in the cell broadcast information, and further, the eNodeB calculates to obtain the corresponding preamble index preamblelndex based on the root sequence index and the detection window index carried in the cell broadcast information. Then, the eNodeB determines whether the PreambleIndex is read by the UE, to obtain a first determination result, if the PreambleIndex is read by the UE, step 206 is executed, otherwise, step 207 is executed.
Step 206: and the eNodeB sets all noise window counters in the current detection window to zero when determining that the leading index is read by the UE according to the first judgment result.
Specifically, in the embodiment of the present invention, when the eNodeB determines that the PreambleIndex is read by the UE according to the first determination result, it determines that the UE selects the PreambleIndex to access the corresponding PRACH, so that all noise window counters in the current detection window are set to 0, that is, WinCounter is 0.
Step 207: the eNodeB increments all noise window counters within the current detection window by 1.
Specifically, in this embodiment of the present invention, when the eNodeB determines that the PreambleIndex is not read by the UE according to the first determination result, the eNodeB adds 1 to all noise window counters in the current detection window, that is, WinCounter is WinCounter0+1, wherein WinCounter0An initial value of WinCounter is indicated.
Step 208: the eNodeB further determines whether the detection window index is equal to a preset detection window index threshold, and obtains a second determination result, if yes, perform step 209, otherwise, perform step 210.
Specifically, in the embodiment of the present invention, after setting WinCounter to 0, the eNodeB further determines whether the WindowIndex is equal to a preset detection window index threshold, that is, determines whether the WindowIndex is equal to floor (N)zc/Ncs) 1, if WindowIndex equals floor (N)zc/Ncs) 1, then step 209 is performed, otherwise step 210 is performed, where N iszcIs the length of the preamble sequence of PRACH, NcsIs the cyclic shift value of the PRACH leader sequence, and is not less than 0 and not more than windowIndex not more than floor (N)zc/Ncs)-1。
For example, when N iszc/NcsFloor (N) when 3.4 ═ szc/Ncs) If-1 is 2, the eNodeB determines whether WindowIndex is equal to 2.
Step 209: and when the eNodeB determines that the detection window index is equal to the detection window index threshold value according to the second judgment result, calculating a first interference noise intensity corresponding to the detection window index according to the leading index.
In particularIn this embodiment of the present invention, the eNodeB determines that the WindowIndex is equal to floor (N) according to the second determination resultzc/Ncs) -1, calculating a first interference noise intensity corresponding to the WindowIndex according to the preamblelndex, specifically, performing signal sampling on a PRACH channel accessed by the UE, calculating power of each sampling point, and calculating a first interference noise intensity corresponding to the detection window index according to the sampling power of each sampling point, a current value of a noise window counter, the detection window index threshold and a preset first interference noise intensity initial value, that is, PowerForNI ═ PowerForNI0(sum of all sample point powers)/WinCounter (floor (N)zc/Ncs) B) 6, wherein PowerForNI0Denotes the initial value of PowerForNI, WinCounter denotes the noise window calculator value, NzcIs the length of the preamble sequence of PRACH, NcsIs a cyclic shift value of a preamble sequence of the PRACH.
Step 210: the eNodeB increments the current detection window index by 1.
Specifically, in the embodiment of the present invention, the eNodeB determines that the WindowIndex is not equal to floor (N) according to the second determination resultzc/Ncs) At-1, add 1 to the current windowIndex, i.e., windowIndex ═ windowIndex0+1, wherein, WindowIndex0Indicates the initial value of the windowIndex.
Step 211: the eNodeB determines whether the root sequence index is equal to a preset root sequence index threshold, and obtains a third determination result, if yes, perform step 212, otherwise, perform step 213.
Specifically, in the embodiment of the present invention, after the eNodeB calculates the first interference noise intensity corresponding to the WindowIndex according to preamblelndex, the eNodeB determines whether the rootsequence index is equal to a preset root sequence index threshold, that is, determines whether the rootsequence index is equal to Ceil (64/floor (N/floor)zc/Ncs) -1 if rootSequenceIndex equals Ceil (64/floor (N)zc/Ncs) -1), step 212 is performed, otherwise step 213 is performed.
For example, when N iszc/NcsFloor (N) when 3.4 ═ szc/Ncs)＝3，64/floor(Nzc/Ncs)＝21.3，Ceil(64/floor(Nzc/Ncs))＝22，Ceil(64/floor(Nzc/Ncs) -1 ═ 21), the eNodeB determines whether RootSequenceIndex is equal to 21.
Step 212: and when the eNodeB further determines that the root sequence index is equal to a preset root sequence index threshold value, calculating to obtain a second interference noise strength of the PRACH based on the first interference noise strength.
Specifically, in the embodiment of the present invention, the eNodeB determines that the rootsequence index is equal to Ceil (64/floor (N))zc/Ncs) When the root sequence index is determined to be the last root sequence of the PRACH signal detection, the power forni is averaged among a plurality of root sequences, specifically, the second interference noise strength of the PRACH is equal to the first interference noise strength divided by a root sequence index threshold, that is, the second interference noise strength is power forni/Ceil (64/floor (N/floor))zc/Ncs))。
Step 213: the eNodeB increments the current root sequence index by 1.
Specifically, in the embodiment of the present invention, the eNodeB determines that RootSequenceIndex is not equal to Ceil (64/floor (N))zc/Ncs) -1, if it is determined that the rootsequence index at this time is not the last root sequence of the PRACH signal detection, adding 1 to the current rootsequence index, that is, rootsequence index ═ rootsequence index0+1, wherein, rootsequence index0Denotes the initial value of the rootsequence index.
Based on the above embodiments, referring to fig. 3, in an embodiment of the present invention, the monitoring and early warning apparatus at least includes: a first judging unit 101, a second unit 102, and a calculating unit 103, wherein,
a first determining unit 101, configured to calculate a corresponding preamble index according to a root sequence index and a detection window index carried in cell broadcast information, and determine whether the preamble index is read by a user equipment UE, so as to obtain a first determination result, where the root sequence index and the detection window index are used to determine a physical random access channel PRACH that can be used by a cell;
a second determining unit 102, configured to further determine whether the detection window index is equal to a preset detection window index threshold when it is determined that the preamble index is read by the UE according to the first determination result, so as to obtain a second determination result;
a calculating unit 103, configured to calculate, according to the leading index, a first interference noise strength corresponding to the detection window index when it is determined that the detection window index is equal to the detection window index threshold according to the second determination result, and further calculate, based on the first interference noise strength, a second interference noise strength of the PRACH when it is determined that the root sequence index is equal to a preset root sequence index threshold.
Optionally, before calculating a corresponding preamble index according to a root sequence index and a detection window index carried in cell broadcast information, and determining whether the preamble index is read by the UE, and obtaining a first determination result, the first determining unit 101 is further configured to:
receiving a PRACH signal sent by UE, demodulating the PRACH signal, and transforming the PRACH signal from a time domain to a frequency domain;
performing sequence correlation on the PRACH signal on a frequency domain, and obtaining a time domain correlation power sequence;
and detecting the peak value of the time domain related power sequence and judging whether the UE is accessed to the PRACH.
Optionally, when it is determined that the preamble index is read by the UE according to the first determination result, the second determining unit 102 is specifically configured to:
and when the UE is determined to select the leading index to access the corresponding PRACH according to the first judgment result, determining that the leading index is read by the UE, and setting all noise window counters in the current detection window to be 0.
Optionally, the second determining unit 102 is further configured to:
and when the leading index is determined not to be read by the UE according to the first judgment result, adding 1 to all noise window counters in the current detection window.
Optionally, when it is determined that the detection window index is equal to the detection window index threshold according to the second determination result, the calculating unit 103 is specifically configured to calculate a first interference noise intensity corresponding to the detection window index according to the preamble index, where:
when the detection window index is determined to be equal to the detection window index threshold value according to the second judgment result, performing signal sampling on a PRACH (physical random access channel) accessed by the UE, and calculating the power of each sampling point;
and calculating to obtain a first interference noise intensity corresponding to the detection window index according to the sampling power of each sampling point, the current value of the noise window counter, the detection window index threshold value and a preset first interference noise intensity initial value.
Optionally, when it is determined that the root sequence index is equal to a preset root sequence index threshold, the second interference noise strength of the PRACH is calculated based on the first interference noise strength, and the calculating unit 103 is specifically configured to:
and when the root sequence index is determined to be equal to a preset root sequence index threshold, calculating to obtain a second interference noise strength of the PRACH according to the first interference noise strength and the root sequence index threshold.
Based on the same inventive concept, an embodiment of the present invention provides a storage medium storing a program for implementing a method of measuring an interference noise intensity, the program, when executed by a processor, performing the steps of:
calculating a corresponding preamble index according to a root sequence index and a detection window index carried in cell broadcast information, and judging whether the preamble index is read by User Equipment (UE) to obtain a first judgment result, wherein the root sequence index and the detection window index are used for determining a Physical Random Access Channel (PRACH) which can be used by a cell;
when the leading index is determined to be read by the UE according to the first judgment result, further judging whether the detection window index is equal to a preset detection window index threshold value or not, and obtaining a second judgment result;
and when determining that the detection window index is equal to the detection window index threshold value according to the second judgment result, calculating a first interference noise intensity corresponding to the detection window index according to the leading index, and further when determining that the root sequence index is equal to a preset root sequence index threshold value, calculating a second interference noise intensity of the PRACH based on the first interference noise intensity.
Based on the same inventive concept, the embodiment of the invention provides a communication device, which comprises one or more processors; and one or more computer-readable media having instructions stored thereon, which when executed by the one or more processors, cause the apparatus to perform the method of any of the above.
In summary, in the embodiment of the present invention, first, the eNodeB calculates a corresponding preamble index according to the root sequence index and the detection window index, determines whether the preamble index is read by the UE, to obtain a first determination result, then, the eNodeB determines whether the detection window index is equal to a preset detection window index threshold, to obtain a second determination result, and finally, the eNodeB calculates a first interference noise intensity corresponding to the detection window index according to the preamble index, and calculates a second interference noise intensity of the PRACH based on the first interference noise intensity. Therefore, the eNodeB calculates a leading index based on the root sequence index and the detection window index, calculates a first interference noise intensity and a second interference noise intensity according to the leading index, directly detects the interference noise intensity of the PRACH accessed by the UE, omits the process of channel estimation of the PRACH, simplifies the steps, reduces the complexity of the measurement process, and simultaneously can ensure the measurement precision of the interference noise intensity and further ensure the practicability and effectiveness of the measurement method because the eNodeB calculates the first interference noise intensity and the second interference noise intensity when determining that the UE is accessed into the PRACH channel and the detection window index and the root sequence index respectively meet the preset detection window index threshold value and the root sequence index threshold value.
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 modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments 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 encompass such modifications and variations.
Claims (14)
1. A method for measuring interference noise level, comprising:
calculating a corresponding preamble index according to a root sequence index and a detection window index carried in cell broadcast information, and judging whether the preamble index is read by User Equipment (UE) to obtain a first judgment result, wherein the root sequence index and the detection window index are used for determining a Physical Random Access Channel (PRACH) which can be used by a cell;
when the leading index is determined to be read by the UE according to the first judgment result, further judging whether the detection window index is equal to a preset detection window index threshold value or not, and obtaining a second judgment result;
and when determining that the detection window index is equal to the detection window index threshold value according to the second judgment result, calculating a first interference noise intensity corresponding to the detection window index according to the leading index, and further when determining that the root sequence index is equal to a preset root sequence index threshold value, calculating a second interference noise intensity of the PRACH based on the first interference noise intensity.
2. The method of claim 1, wherein before calculating a corresponding preamble index according to a root sequence index and a detection window index carried in cell broadcast information, determining whether the preamble index is read by a UE, and obtaining a first determination result, the method further comprises:
receiving a PRACH signal sent by UE, demodulating the PRACH signal, and transforming the PRACH signal from a time domain to a frequency domain;
performing sequence correlation on the PRACH signal on a frequency domain, and obtaining a time domain correlation power sequence;
and detecting the peak value of the time domain related power sequence and judging whether the UE is accessed to the PRACH.
3. The method according to claim 1 or 2, wherein when determining that the preamble index is read by the UE according to the first determination result, specifically includes:
and when the UE is determined to select the leading index to access the corresponding PRACH according to the first judgment result, determining that the leading index is read by the UE, and setting all noise window counters in the current detection window to be 0.
4. The method of claim 3, further comprising:
and when the leading index is determined not to be read by the UE according to the first judgment result, adding 1 to all noise window counters in the current detection window.
5. The method according to claim 3, wherein when it is determined that the detection window index is equal to the detection window index threshold according to the second determination result, calculating a first interference noise strength corresponding to the detection window index according to the preamble index, specifically includes:
when the detection window index is determined to be equal to the detection window index threshold value according to the second judgment result, performing signal sampling on a PRACH (physical random access channel) accessed by the UE, and calculating the power of each sampling point;
and calculating to obtain a first interference noise intensity corresponding to the detection window index according to the sampling power of each sampling point, the current value of the noise window counter, the detection window index threshold value and a preset first interference noise intensity initial value.
6. The method of claim 1 or 2, wherein when determining that the root sequence index is equal to a preset root sequence index threshold, calculating a second interference noise strength of the PRACH based on the first interference noise strength comprises:
and when the root sequence index is determined to be equal to a preset root sequence index threshold, calculating to obtain a second interference noise strength of the PRACH according to the first interference noise strength and the root sequence index threshold.
7. An apparatus for measuring interference noise level, comprising:
a first judging unit, configured to calculate a corresponding preamble index according to a root sequence index and a detection window index carried in cell broadcast information, and judge whether the preamble index is read by a user equipment UE, to obtain a first judgment result, where the root sequence index and the detection window index are used to determine a physical random access channel PRACH that can be used by a cell;
a second determining unit, configured to further determine whether the detection window index is equal to a preset detection window index threshold when it is determined that the preamble index is read by the UE according to the first determination result, so as to obtain a second determination result;
and a calculating unit, configured to calculate, when it is determined that the detection window index is equal to the detection window index threshold according to the second determination result, a first interference noise strength corresponding to the detection window index according to the preamble index, and further calculate, when it is determined that the root sequence index is equal to a preset root sequence index threshold, a second interference noise strength of the PRACH based on the first interference noise strength.
8. The apparatus of claim 7, wherein before calculating a corresponding preamble index according to a root sequence index and a detection window index carried in cell broadcast information, determining whether the preamble index is read by a UE, and obtaining a first determination result, the first determining unit is further configured to:
receiving a PRACH signal sent by UE, demodulating the PRACH signal, and transforming the PRACH signal from a time domain to a frequency domain;
performing sequence correlation on the PRACH signal on a frequency domain, and obtaining a time domain correlation power sequence;
and detecting the peak value of the time domain related power sequence and judging whether the UE is accessed to the PRACH.
9. The apparatus according to claim 7 or 8, wherein when determining that the preamble index is read by the UE according to the first determination result, the second determining unit is specifically configured to:
and when the UE is determined to select the leading index to access the corresponding PRACH according to the first judgment result, determining that the leading index is read by the UE, and setting all noise window counters in the current detection window to be 0.
10. The apparatus of claim 9, wherein the second determining unit is further configured to:
and when the leading index is determined not to be read by the UE according to the first judgment result, adding 1 to all noise window counters in the current detection window.
11. The apparatus according to claim 9, wherein when it is determined that the detection window index is equal to the detection window index threshold according to the second determination result, the calculating unit is specifically configured to calculate a first interference noise strength corresponding to the detection window index according to the preamble index, and:
when the detection window index is determined to be equal to the detection window index threshold value according to the second judgment result, performing signal sampling on a PRACH (physical random access channel) accessed by the UE, and calculating the power of each sampling point;
and calculating to obtain a first interference noise intensity corresponding to the detection window index according to the sampling power of each sampling point, the current value of the noise window counter, the detection window index threshold value and a preset first interference noise intensity initial value.
12. The apparatus according to claim 7 or 8, wherein when determining that the root sequence index is equal to a preset root sequence index threshold, the calculating unit is specifically configured to calculate a second interference noise strength of the PRACH based on the first interference noise strength, and wherein:
and when the root sequence index is determined to be equal to a preset root sequence index threshold, calculating to obtain a second interference noise strength of the PRACH according to the first interference noise strength and the root sequence index threshold.
13. A storage medium storing a program for implementing a method for measuring interference noise level, the program, when executed by a processor, performing the steps of:
calculating a corresponding preamble index according to a root sequence index and a detection window index carried in cell broadcast information, and judging whether the preamble index is read by User Equipment (UE) to obtain a first judgment result, wherein the root sequence index and the detection window index are used for determining a Physical Random Access Channel (PRACH) which can be used by a cell;
when the leading index is determined to be read by the UE according to the first judgment result, further judging whether the detection window index is equal to a preset detection window index threshold value or not, and obtaining a second judgment result;
and when determining that the detection window index is equal to the detection window index threshold value according to the second judgment result, calculating a first interference noise intensity corresponding to the detection window index according to the leading index, and further when determining that the root sequence index is equal to a preset root sequence index threshold value, calculating a second interference noise intensity of the PRACH based on the first interference noise intensity.
14. A communications apparatus comprising one or more processors; and one or more computer-readable media having instructions stored thereon that, when executed by the one or more processors, cause the apparatus to perform the method of any of claims 1-6.
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