CN109120357B - Signal search detection method, device, terminal and system - Google Patents
Signal search detection method, device, terminal and system Download PDFInfo
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- CN109120357B CN109120357B CN201810979259.3A CN201810979259A CN109120357B CN 109120357 B CN109120357 B CN 109120357B CN 201810979259 A CN201810979259 A CN 201810979259A CN 109120357 B CN109120357 B CN 109120357B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
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- H—ELECTRICITY
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
Abstract
The invention relates to a signal search detection method, a signal search detection device, a signal search detection terminal and a signal search detection system. The method comprises the following steps: performing CRC decoding processing on the combined signal; the combined signal is obtained by demodulating and soft combining each effective subframe signal meeting the preset condition; the effective subframe signal is a signal of which the signal power is greater than or equal to a power effectiveness threshold value in the received search space subframe signal; and judging whether the search space subframe signals are correctly detected or not according to the CRC decoding processing result. Aiming at a retransmission mechanism, the complexity of signal search detection is reduced by carrying out CRC decoding processing on the combined signal and directly according to the CRC decoding processing result, and the CRC decoding processing judges that the combined signal is aimed at instead of an independent search space subframe signal, so that the success rate of signal search detection is improved; the method and the device have the advantages that the complexity is reduced comprehensively, the success rate is improved, and the efficiency of signal search detection is improved.
Description
Technical Field
The present application relates to the field of mobile broadband communications technologies, and in particular, to a method, an apparatus, a terminal, and a system for signal search detection.
Background
The Internet of things is an important component of a new generation of information technology and is characterized in that objects are connected in a cooperative manner. Communication between objects is a necessary condition for realizing cooperative connection between objects. The existing 2G (2-Generation WIreless telephone technology, second-Generation mobile communication technology) or 3G (3rd-Generation, third-Generation mobile communication technology) communication protocol cannot meet the requirements of low power, low cost, wide coverage and large capacity, and other low-power standard protocols such as Lora (Long Range), WiFi (WIreless Fidelity) have defects in information security, mobility and capacity, and further, the demand for new cellular Internet of Things standard is more and more urgent, so that NB-IoT (Narrow Band Internet of Things based on cellular) standard is generated.
NB-IoT is constructed in a cellular network, consumes only a frequency band of about 180KHz (kiloHertz), and can be directly deployed in a GSM (Global System for Mobile communication), UMTS (Universal Mobile Telecommunications System), or LTE (Long Term Evolution) network, so as to reduce the deployment cost and achieve smooth upgrade. In addition, the NB-IoT introduces a repeated sending mechanism for improving coverage enhancement, obtains time diversity gain, and adopts a low-order modulation mode to improve demodulation performance and enhance coverage. In the NB-IoT standard, all physical channels can be repeatedly transmitted (8 to 256 retransmissions), and theoretically, 9-12 dB (deciBel) gains can be obtained.
In the implementation process, the inventor finds that at least the following problems exist in the conventional technology: the existing NB-IoT repeated transmission mechanism has the problem of high complexity of signal search detection.
Disclosure of Invention
In view of the above, it is desirable to provide a signal search detection method, device, terminal and system capable of reducing the complexity of signal search detection.
In order to achieve the above object, in one aspect, an embodiment of the present invention provides a signal search detection method, including:
performing CRC decoding processing on the combined signal; the combined signal is obtained by demodulating and soft combining each effective subframe signal meeting the preset condition; the effective subframe signal is a signal of which the signal power is greater than or equal to a power effectiveness threshold value in the received search space subframe signal;
and judging whether the search space subframe signals are correctly detected or not according to the CRC decoding processing result.
In one embodiment, the preset condition is that the SNR value of the valid subframe signal is greater than or equal to the SNR threshold value, and the CRC check result of the valid subframe signal is an error; the SNR threshold is obtained based on the retransmission times of the search space subframe signals;
before the step of performing CRC decoding processing on the combined signal, the method further includes the steps of:
and acquiring a CRC check result and an SNR value of the effective subframe signal.
In one embodiment, the step of obtaining the CRC check result and the SNR value of the valid subframe signal includes:
demodulating and decoding the effective subframe signals to obtain a CRC (cyclic redundancy check) result;
and in the demodulation process, measuring the channel quality of the effective subframe signals to obtain an SNR value.
In one embodiment, before obtaining the CRC check result and SNR value of the valid subframe signal, the method further comprises the steps of:
blind detection is carried out on the received search space subframe signals, and the power of the search space subframe signals is obtained;
and when the power of the search space subframe signal is greater than or equal to the power validity threshold value, confirming the search space subframe signal as a valid subframe signal.
In one embodiment, after obtaining the CRC check result and the SNR value of the valid subframe signal, the method further includes the steps of:
and demodulating and soft-combining the effective subframe signals meeting the preset conditions to obtain combined signals.
In one embodiment, the method further includes, after the step of obtaining the CRC check result and the SNR value of the valid subframe signal, the steps of:
and obtaining an SNR threshold value based on the retransmission times of the search space subframe signals.
In one embodiment, the step of obtaining the SNR threshold based on the number of retransmissions of the search space subframe signal comprises:
obtaining a retransmission combination frame number based on the retransmission times and the maximum combination frame number of the search space subframe signals;
obtaining a retransmission performance gain value according to the retransmission combination frame number;
and obtaining the SNR threshold according to the non-retransmission detection threshold and the retransmission performance gain.
On the other hand, an embodiment of the present invention further provides a signal detection apparatus, including:
a combined signal CRC decoding module for performing CRC decoding processing on the combined signal; the combined signal is obtained by demodulating and soft combining each effective subframe signal meeting the preset condition; the effective subframe signal is a signal of which the signal power is greater than or equal to a power effectiveness threshold value in the received search space subframe signal;
and the judging module is used for judging whether the search space subframe signals are correctly detected or not according to the CRC decoding processing result.
A terminal is used for executing the steps of the signal search detection method.
In one embodiment, the terminal is an NB-IoT terminal.
A signal search detection system comprises a base station and a terminal connected with the base station.
In one of the embodiments, the base station is an NB-IoT base station; the terminal is an NB-IoT terminal.
One of the above technical solutions has the following advantages and beneficial effects:
aiming at a retransmission mechanism, judging whether a search space subframe signal is correctly detected or not by processing combined signal decoding CRC (Cyclic Redundancy Check) directly according to a CRC decoding processing result, if not, carrying out CRC decoding processing on a new combined signal until the search space subframe signal is correctly detected, so that the complexity of signal search detection is reduced, and the CRC decoding processing and the judgment aim at the combined signal rather than an independent search space subframe signal, so that the success rate of signal search detection is improved; the method and the device have the advantages that the complexity is reduced comprehensively, the success rate is improved, and the efficiency of signal search detection is improved.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 is a diagram of an exemplary embodiment of a signal search detection method;
FIG. 2 is a first schematic flow chart diagram of a signal search detection method in one embodiment;
FIG. 3 is a second schematic flow chart diagram of a signal search detection method in one embodiment;
FIG. 4 is a third schematic flow chart diagram illustrating a signal search detection method in one embodiment;
FIG. 5 is a block diagram showing the structure of a signal search detection device according to an embodiment;
FIG. 6 is a diagram illustrating an internal structure of a computer device according to an embodiment;
fig. 7 is a block diagram showing the structure of a signal search detection system in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Since the NB-IoT system adopts a retransmission mechanism, the NPDCCH has more search space and higher complexity for cell search. Therefore, for NB-IoT terminal access, a simple NPDCCH search detection method with low computational complexity is needed. The method and the device have the advantages that the combined signals are subjected to CRC decoding processing, and then judgment is directly carried out according to the result of the CRC decoding processing, so that the complexity of signal search detection is reduced, the operation is simple and convenient, and the efficiency of signal search detection is improved.
The signal search detection method provided by the application can be applied to the application environment shown in fig. 1. Wherein the terminal 102 communicates with the base station 104. The terminal 102 is a user equipment capable of performing cell search in a search space, and may also be an NB-IoT terminal, which may specifically be but not limited to various personal computers, notebook computers, smart phones, tablet computers, and portable wearable devices; further, the search space may be a search space included in an NPDCCH (Narrowband Physical Downlink Control Channel), the base station 104 may be, but not limited to, various macro base stations, micro base stations, pico base stations, and distributed base stations, and further, the base station 104 may be an NB-IoT base station.
In one embodiment, as shown in fig. 2, a signal search detection method is provided, which is described by taking the application of the method to the terminal in fig. 1 as an example, and includes the following steps:
in step 202, CRC decoding processing is performed on the combined signal.
The combined signal is obtained by demodulating and soft combining each effective subframe signal meeting the preset condition; the valid subframe signal is a signal of which the signal power is greater than or equal to a power validity threshold value in the received search space subframe signal.
Specifically, the demodulation and soft combining process may refer to the following processes such as demodulating and then soft combining the multiple retransmission data (in this application, processing each valid subframe signal), and then decoding (i.e., step 202).
Specifically, modulo-2 division is performed between the binary number of the combined signal and the binary number of the generator polynomial to obtain a remainder; the binary number of the signal is combined as dividend, and the binary number of the polynomial is generated as divisor.
It should be noted that the binary codes in the combined signal include an information code and a CRC check code; there is a corresponding relationship between the generator polynomial and the CRC check code, and the generator polynomial may be, but is not limited to: x corresponding to CRC-4 standard4+ x +1, the corresponding binary number is 10011; x corresponding to CRC-8 standard8+x2+ x +1, the corresponding binary number is 100000111; in addition, the generator polynomial may be a generator polynomial corresponding to the CRC-12 standard, the CRC-16 standard, the CRC-32 standard, and the CRC-32C standard and a corresponding binary code, which are not described herein again.
And step 204, judging whether the search space subframe signals are correctly detected or not according to the CRC decoding processing result.
The CRC decoding processing result is the remainder obtained by performing modulo-2 division on the binary number in the combined signal and the binary number of the generator polynomial.
Specifically, when the remainder is 0, the decision is to correctly detect the search space subframe signal; when the remainder is not 0, the decision is not to correctly detect the search space subframe signal. Further, the CRC decoding processing result may also be a CRC flag bit, specifically, when the remainder is 0, the CRC flag bit is 1, and then it is determined that the search space subframe signal is correctly detected; when the remainder is not 0, the CRC marks the position 0, and then the search space subframe signal is judged not to be correctly detected.
It should be noted that, if the decision is no, the method is executed again until the decision is yes.
In the signal search detection method, aiming at a retransmission mechanism, through carrying out CRC (Cyclic Redundancy Check) processing on a combined signal, judging whether a search space subframe signal is correctly detected directly according to a CRC decoding processing result, if not, carrying out CRC decoding processing on a new combined signal until the search space subframe signal is correctly detected, so that the complexity of signal search detection is reduced, and the CRC decoding processing and judging whether the combined signal is aimed at the combined signal instead of an independent search space subframe signal, so that the success rate of signal search detection is improved; the method and the device have the advantages that the complexity is reduced, the long power is increased, and the efficiency of signal search detection is improved.
In one embodiment, as shown in fig. 3, a signal search detection method is provided, which is described by taking the application of the method to the terminal in fig. 1 as an example, and includes the following steps:
step S302, receiving a search space subframe signal;
the search space subframe signal is a subframe signal on a search space.
Specifically, the search space subframe signal is received over the search space encompassed by NPDCCH.
Step S304, blind detection is carried out on the search space subframe signals, and the power of the search space subframe signals is obtained.
Specifically, the process of blind detection on the search space subframe signal can be implemented by using the following formula:
wherein n is a searchA data index of the spatial subframe signal, N being a data length of the search spatial subframe signal; psIs the power of the search space subframe signal; x (N) is a search space subframe signal, where N is 1 to N.
Step S306, when the power of the search space subframe signal is greater than or equal to the power validity threshold value, the search space subframe signal is confirmed as a valid subframe signal.
Specifically, the power P of the search space subframe signal is performed according to the following equationsAnd a power validity threshold value PTHComparison between the two parts:
and when the above formula is valid, confirming the search space subframe signal as a valid subframe signal.
It should be noted that, effective subframe signals in the search space subframe signals can be screened out according to the detected power, the search detection success rate of the search space subframe signals is improved, the complexity is also reduced, only the effective subframe signals in the search space subframe signals need to be processed, and the operation is simple and convenient.
Step S308, a CRC check result and an SNR value of the valid subframe signal are obtained.
Specifically, demodulating and decoding the effective subframe signal to obtain a CRC check result; and in the demodulation process, measuring the channel quality of the effective subframe signals to obtain an SNR value.
It should be noted that the process of obtaining the CRC result of the valid subframe signal is similar to the CRC decoding process, and is not described herein again.
Step S310, based on the retransmission times of the search space subframe signal, an SNR threshold is obtained.
Wherein, the retransmission times of the search space subframe signal can be set to be 1, 2, 4, 8, 16 to 2 to infinite integer power. Preferably, the number of retransmissions of the search space subframe signal may be set to 8, 16 or 32.
Specifically, a retransmission combination frame number is obtained based on the retransmission times and the maximum combination frame number of the search space subframe signals; obtaining a retransmission performance gain value according to the retransmission combination frame number; and obtaining the SNR threshold according to the non-retransmission detection threshold and the retransmission performance gain.
Further, let the number of retransmissions of the search space subframe signal be R, the maximum combining frame number be L, and further the number of retransmission combining frames K can be obtained by the following formula:
K＝min{R/2,L}
where L < R, the maximum number of merge frames L may be preferably set to 4.
The retransmission performance gain value Δ SNR can be obtained by the following equation:
ΔSNR＝3×log2K
setting a non-retransmission threshold value to SNRTHAnd then the SNR threshold may be obtained by the following equation:
SNRTH-ΔSNR
preferably, the non-retransmission threshold is SNRTHMay be set to 0 dB.
In step S312, each valid subframe signal satisfying the preset condition is demodulated and soft-combined to obtain a combined signal.
The preset conditions are that the SNR value of the effective subframe signal is greater than or equal to an SNR threshold value, and the CRC check result of the effective subframe signal is wrong; the SNR threshold is based on the number of retransmissions of the search space subframe signal.
Specifically, the demodulation and soft Combining processes may employ a Maximum Ratio Combining (MRC) method;
the SNR value of the valid subframe signal being greater than or equal to the SNR threshold may be expressed as:
SNR≥SNRTH-ΔSNR
the SNR on the left of the above formula represents the SNR value of the valid subframe signal.
It should be noted that when the CRC result of the valid subframe signal is correct, it can be determined that the search space subframe signal is correctly detected, so that the demodulation and soft combining processes and the subsequent steps can be omitted, and the search detection efficiency can be improved.
Step S314 of performing CRC decoding processing on the combined signal; and judging whether the search space subframe signals are correctly detected or not according to the CRC decoding processing result.
It should be noted that the above steps are already described in the above embodiments, and are not described herein again.
The present embodiment will be described with reference to a specific example.
A signal search detection method as shown in fig. 4 is described by taking the method as an example applied to the terminal in fig. 1, and includes the following steps:
step S402, receiving the search space subframe signal to measure the power.
Specifically, the subframe signal in each search space is subjected to time domain or frequency domain channel power measurement to obtain a measured value Ps. Further, receiving a search space subframe signal x (N) (N is 1 to N), and performing blind power measurement on the search space subframe signal (power is obtained by implementing blind detection based on the following formula):
where N is the data index of the search space subframe signal, and N is the data length of the search space subframe signal.
Step S404, judging the validity of the transmission space (search space subframe signal) according to the power.
In particular, by means of a power validity threshold value PTHTo determine the validity of the current subframe transmission space (search space subframe signal). Further, if Ps≥PTHThe search space signal (search space subframe signal) is considered to be valid if Ps＜PTHIt is considered invalid. Wherein P isTHA validity power threshold (power validity threshold) exists for the signal, as shown in the following equation:
step S406, performing signal demodulation and decoding on the effective transmission space and performing physical measurement.
Specifically, the search space signal for which the decision is valid is subjected to demodulation decoding processing, and a physical layer quantity SNR (SNR value) is measured.
Further, demodulating and decoding the effective space (search space subframe signal) to obtain a CRC check result; and measuring the channel quality in the demodulation process to obtain an SNR value.
Step S408, determining the initial search result of the current subframe according to the decoding result (CRC check result), and if the decoding error (CRC check result is incorrect), performing demodulation and soft combining processing determination according to the retransmission times (retransmission times of the search space subframe signal) and the physical measurement value (SNR value) of the search.
Specifically, if SNR ≧ SNRTHIf the- Δ SNR and CRC check result are incorrect (predetermined condition), multi-frame retransmission demodulation and soft combining (demodulation and soft combining for each valid subframe signal) are performed, otherwise, no combining is performed.
Wherein, the Δ SNR is a retransmission combination performance gain value,
SNRTHthe detection threshold value under non-retransmission can be set to 0 dB;
r is the possible retransmission times of the search;
l is the maximum merge frame number and L < R, typically set to 4;
k is min { R/2, L } is the retransmission and combination frame number obtained by calculation;
the SNR on the left side of the equation represents the SNR value.
It should be noted that, when the CRC check result is correct, the above demodulation and soft combining processing determination and subsequent steps are not required, and it can be confirmed that the search space subframe signal is correctly detected.
Step S410, demodulating, soft combining, and decoding the data (each valid subframe signal satisfying the preset condition), and performing re-search decision according to the decoding result.
Specifically, the data is demodulated and soft-combined by using a Maximum Ratio Combining (MRC) method, and then the CRC decoding process is performed to perform a detection decision (search decision), where CRC ═ 1(CRC flag position 1) is used to correctly detect the search space subframe signal.
Further, the CRC check result (CRC decoding processing result) after the soft combining decoding is judged again, and if the CRC check result (CRC decoding processing result) is correct, the search detection is considered to be successful.
It should be understood that, although the steps in the flowcharts of fig. 2 to 4 are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 2-4 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least some of the sub-steps or stages of other steps.
In one embodiment, as shown in fig. 5, there is provided a signal search detection apparatus including:
a combined signal CRC decoding module 510, configured to perform CRC decoding processing on the combined signal; the combined signal is obtained by demodulating and soft combining each effective subframe signal meeting the preset condition; the effective subframe signal is a signal of which the signal power is greater than or equal to a power effectiveness threshold value in the received search space subframe signal;
the decision module 530 is configured to decide whether the search space subframe signal is correctly detected according to the CRC decoding processing result.
In a specific example, the preset condition is that the SNR value of the valid subframe signal is greater than or equal to the SNR threshold value, and the CRC check result of the valid subframe signal is an error; the SNR threshold is obtained based on the retransmission times of the search space subframe signals;
further comprising:
and the effective subframe signal acquisition module is used for acquiring a CRC check result and an SNR value of the effective subframe signal before CRC decoding processing is carried out on the combined signal.
In a specific example, the valid subframe signal acquisition module includes:
the demodulation decoding module is used for demodulating and decoding the effective subframe signals to obtain a CRC (cyclic redundancy check) check result;
and the channel quality measurement module is used for measuring the channel quality of the effective subframe signals in the demodulation process to obtain the SNR value.
In a specific example, the method further comprises the following steps:
the blind detection module is used for carrying out blind detection on the received search space subframe signals to obtain the power of the search space subframe signals;
and the valid subframe signal confirming module is used for confirming the search space subframe signal as a valid subframe signal when the power of the search space subframe signal is greater than or equal to a power validity threshold value.
In a specific example, the method further comprises the following steps:
and the demodulation and soft combination module is used for demodulating and soft combining each effective subframe signal meeting the preset conditions after acquiring the CRC check result and the SNR value of the effective subframe signal to obtain a combined signal.
In a specific example, the method further comprises the following steps:
and the SNR threshold module is used for obtaining the SNR threshold based on the retransmission times of the search space subframe signals.
In one particular example, the SNR threshold module includes:
a retransmission merging frame number module, configured to obtain a retransmission merging frame number based on the retransmission times and the maximum merging frame number of the search space subframe signals;
the retransmission performance gain value module is used for obtaining a retransmission performance gain value according to the retransmission combined frame number;
and the SNR threshold obtaining module is used for obtaining the SNR threshold according to the non-retransmission detection threshold and the retransmission performance gain value.
For specific limitations of the signal search detection device, reference may be made to the above limitations of the signal search detection method, which are not described herein again. The modules in the signal search detection device can be wholly or partially implemented by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a user equipment interacting with a base station in the present application is provided, and the computer equipment may be a terminal, and its internal structure diagram may be as shown in fig. 6. The computer device includes a processor, a memory, a network interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a signal search detection method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 6 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a terminal is provided, which performs the following steps:
performing CRC decoding processing on the combined signal; the combined signal is obtained by demodulating and soft combining each effective subframe signal meeting the preset condition; the effective subframe signal is a signal of which the signal power is greater than or equal to a power effectiveness threshold value in the received search space subframe signal;
and judging whether the search space subframe signals are correctly detected or not according to the CRC decoding processing result.
In a specific example, the terminal further performs the following steps: the preset conditions are that the SNR value of the effective subframe signal is greater than or equal to the SNR threshold value, and the CRC check result of the effective subframe signal is wrong; the SNR threshold is obtained based on the retransmission times of the search space subframe signals;
before the step of performing CRC decoding processing on the combined signal, the method further includes the steps of:
and acquiring a CRC check result and an SNR value of the effective subframe signal.
In a specific example, the terminal further performs the following steps: the step of obtaining the CRC check result and the SNR value of the valid subframe signal comprises the following steps:
demodulating and decoding the effective subframe signals to obtain a CRC (cyclic redundancy check) result;
and in the demodulation process, measuring the channel quality of the effective subframe signals to obtain an SNR value.
In a specific example, the terminal further performs the following steps: further comprising the steps of:
blind detection is carried out on the received search space subframe signals, and the power of the search space subframe signals is obtained;
and when the power of the search space subframe signal is greater than or equal to the power validity threshold value, confirming the search space subframe signal as a valid subframe signal.
In a specific example, the terminal further performs the following steps: after obtaining the CRC check result and SNR value of the valid subframe signal, the method also comprises the following steps:
and demodulating and soft-combining the effective subframe signals meeting the preset conditions to obtain combined signals.
In a specific example, the terminal further performs the following steps: the method further comprises the following steps after the step of obtaining the CRC check result and the SNR value of the valid subframe signal:
and obtaining an SNR threshold value based on the retransmission times of the search space subframe signals.
In a specific example, the terminal further performs the following steps: the step of obtaining the SNR threshold based on the number of retransmissions of the search space subframe signal comprises:
obtaining a retransmission combination frame number based on the retransmission times and the maximum combination frame number of the search space subframe signals;
obtaining a retransmission performance gain value according to the retransmission combination frame number;
and obtaining the SNR threshold according to the non-retransmission detection threshold and the retransmission performance gain.
In one particular example, the terminal is an NB-IoT terminal.
In one embodiment, as shown in fig. 7, a signal search detection system is provided, which includes a base station 710 and a terminal 730 connected to the base station 710.
In one particular example, base station 710 is an NB-IoT base station; terminal 730 is an NB-IoT terminal.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the above-mentioned signal search detection method.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (19)
1. A signal search detection method, comprising:
performing CRC decoding processing on the combined signal; the combined signal is obtained by demodulating and soft combining each effective subframe signal meeting the preset condition; the effective subframe signals are signals of which the signal power is greater than or equal to a power effectiveness threshold value in the received search space subframe signals; the preset condition is that the SNR value of the effective subframe signal is greater than or equal to an SNR threshold value, and the CRC check result of the effective subframe signal is wrong; the SNR threshold is obtained based on the retransmission times of the search space subframe signals;
judging whether the search space subframe signals are correctly detected or not according to the CRC decoding processing result;
receiving a search space subframe signal to measure power;
judging the effectiveness of the transmission space according to the measured power, demodulating and decoding the effective transmission space and carrying out physical measurement;
judging the initial search result of the current subframe according to the decoding result, and if the decoding is wrong, performing demodulation and soft combining processing judgment according to the searched retransmission times and physical measurement values;
and demodulating, soft combining and decoding each effective subframe signal meeting the preset conditions, and performing re-search judgment according to a decoding result.
2. The signal search detection method according to claim 1, further comprising, before the step of performing CRC decoding processing on the combined signal, the steps of:
and acquiring the CRC check result and the SNR value of the effective subframe signal.
3. The signal search detection method of claim 2, wherein the step of obtaining the CRC check result and the SNR value of the valid subframe signal comprises:
demodulating and decoding the effective subframe signal to obtain the CRC check result;
and in the demodulation process, measuring the channel quality of the effective subframe signals to obtain the SNR value.
4. The signal search detection method according to claim 2, further comprising, before obtaining the CRC check result and the SNR value of the valid subframe signal, the steps of:
blind detection is carried out on the received search space subframe signals, and the power of the search space subframe signals is obtained;
and when the power of the search space subframe signal is greater than or equal to the power validity threshold value, confirming the search space subframe signal as the valid subframe signal.
5. The signal search detection method according to claim 2, further comprising, after obtaining the CRC check result and the SNR value of the valid subframe signal, the steps of:
and demodulating and soft combining the effective subframe signals meeting the preset conditions to obtain combined signals.
6. The signal search detection method according to claim 2, further comprising, after the step of obtaining the CRC check result and the SNR value of the valid subframe signal, the steps of:
and obtaining the SNR threshold value based on the retransmission times of the search space subframe signals.
7. The signal search detection method of claim 6 wherein the step of deriving the SNR threshold based on the number of retransmissions of the search space subframe signal comprises:
obtaining a retransmission combination frame number based on the retransmission times and the maximum combination frame number of the search space subframe signals;
obtaining a retransmission performance gain value according to the retransmission merging frame number;
and obtaining the SNR threshold according to a non-retransmission detection threshold value and the retransmission performance gain value.
8. A signal search detection apparatus, the apparatus comprising:
a combined signal CRC decoding module for performing CRC decoding processing on the combined signal; the combined signal is obtained by demodulating and soft combining each effective subframe signal meeting the preset condition; the effective subframe signals are signals of which the signal power is greater than or equal to a power effectiveness threshold value in the received search space subframe signals; the preset condition is that the SNR value of the effective subframe signal is greater than or equal to an SNR threshold value, and the CRC check result of the effective subframe signal is wrong; the SNR threshold is obtained based on the retransmission times of the search space subframe signals;
the judging module is used for judging whether the search space subframe signal is correctly detected or not according to the CRC decoding processing result;
the receiving module is used for receiving the search space subframe signals and carrying out power measurement;
the merging module is used for judging the effectiveness of the transmission space according to the measured power, demodulating and decoding the effective transmission space and carrying out physical measurement; judging the initial search result of the current subframe according to the decoding result, and if the decoding is wrong, performing demodulation and soft combining processing judgment according to the searched retransmission times and physical measurement values;
and the combined signal CRC decoding module is also used for demodulating, soft combining and decoding each effective subframe signal meeting the preset conditions, and performing re-search judgment according to a decoding result.
9. The signal search detection device according to claim 8, further comprising: and the valid subframe signal acquisition module is used for acquiring the CRC check result and the SNR value of the valid subframe signal before the step of carrying out CRC decoding processing on the combined signal.
10. The apparatus according to claim 9, wherein the valid subframe signal acquisition module comprises:
the demodulation and decoding module is used for demodulating and decoding the effective subframe signals to obtain the CRC check result;
and the channel quality measurement module is used for measuring the channel quality of the effective subframe signals in the demodulation process to obtain the SNR value.
11. The signal search detection device according to claim 9, further comprising:
the blind detection module is used for carrying out blind detection on the received search space subframe signal to obtain the power of the search space subframe signal;
and the valid subframe signal confirming module is used for confirming the search space subframe signal as the valid subframe signal when the power of the search space subframe signal is greater than or equal to the power validity threshold value.
12. The signal search detection device according to claim 9, further comprising:
and the demodulation and soft combination module is used for demodulating and soft combining each effective subframe signal meeting the preset condition after acquiring a CRC (cyclic redundancy check) result and an SNR (signal to noise ratio) value of the effective subframe signal to obtain a combined signal.
13. The signal search detection device according to claim 9, further comprising:
and the SNR threshold module is used for obtaining the SNR threshold based on the retransmission times of the search space subframe signals.
14. The signal search detection device of claim 13, wherein the SNR threshold module comprises:
a retransmission merging frame number module, configured to obtain a retransmission merging frame number based on the retransmission times and the maximum merging frame number of the search space subframe signal;
a retransmission performance gain value module, configured to obtain a retransmission performance gain value according to the retransmission merging frame number;
and the SNR threshold value determining module is used for obtaining the SNR threshold value according to a non-retransmission detection threshold value and the retransmission performance gain value.
15. A terminal, characterized in that the terminal comprises a storage medium, a processor and a computer program stored on the storage medium and executable on the processor, the processor when executing the computer program being adapted to carry out the steps of the method of any of claims 1 to 7.
16. The terminal of claim 15, wherein the terminal is an NB-IoT terminal.
17. A signal search detection system is characterized by comprising a base station and a terminal connected with the base station;
the terminal is adapted to perform the steps of the method of any of claims 1 to 7.
18. The signal search detection system of claim 17, the base station being an NB-IoT base station; the terminal is an NB-IoT terminal.
19. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 7.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101138184A (en) * | 2005-03-11 | 2008-03-05 | 松下电器产业株式会社 | Retransmission method, wireless receiving equipment, and multi-antenna wireless communication system |
| CN101267388A (en) * | 2007-03-15 | 2008-09-17 | 株式会社Ntt都科摩 | A dispatching method and device based on mixed automatic request retransfer |
| CN101924617A (en) * | 2009-06-11 | 2010-12-22 | 中兴通讯股份有限公司 | Decoding merging method and device based on hybrid automatic repeat request |
| CN102064879A (en) * | 2010-11-30 | 2011-05-18 | 大唐移动通信设备有限公司 | Method, system and equipment for time division duplex communication |
| CN105490779A (en) * | 2015-12-14 | 2016-04-13 | 上海创远仪器技术股份有限公司 | Physical downlink control channel (PDCCH) blind detection method |
| CN107040358A (en) * | 2016-02-04 | 2017-08-11 | 株式会社Kt | The method and its device of upward signal are sent and received for NB IoT UE |
| CN107708178A (en) * | 2017-09-08 | 2018-02-16 | 中国联合网络通信集团有限公司 | Method for retransmitting information and base station |
| CN108141341A (en) * | 2015-10-19 | 2018-06-08 | Lg 电子株式会社 | Receive the method for down link signal and the method and base station of user equipment and transmission down link signal |
| CN108307507A (en) * | 2016-08-11 | 2018-07-20 | 株式会社Kt | Method and its equipment for receiving multi-case data |
| CN108352932A (en) * | 2015-11-04 | 2018-07-31 | 交互数字专利控股公司 | Method and process for narrowband LTE operation |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107733627B (en) * | 2016-08-12 | 2020-12-01 | 株式会社Kt | Method and apparatus for transmitting or receiving multicast control channel for NB-IoT terminals |
-
2018
- 2018-08-27 CN CN201810979259.3A patent/CN109120357B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101138184A (en) * | 2005-03-11 | 2008-03-05 | 松下电器产业株式会社 | Retransmission method, wireless receiving equipment, and multi-antenna wireless communication system |
| CN101267388A (en) * | 2007-03-15 | 2008-09-17 | 株式会社Ntt都科摩 | A dispatching method and device based on mixed automatic request retransfer |
| CN101924617A (en) * | 2009-06-11 | 2010-12-22 | 中兴通讯股份有限公司 | Decoding merging method and device based on hybrid automatic repeat request |
| CN102064879A (en) * | 2010-11-30 | 2011-05-18 | 大唐移动通信设备有限公司 | Method, system and equipment for time division duplex communication |
| CN108141341A (en) * | 2015-10-19 | 2018-06-08 | Lg 电子株式会社 | Receive the method for down link signal and the method and base station of user equipment and transmission down link signal |
| CN108352932A (en) * | 2015-11-04 | 2018-07-31 | 交互数字专利控股公司 | Method and process for narrowband LTE operation |
| CN105490779A (en) * | 2015-12-14 | 2016-04-13 | 上海创远仪器技术股份有限公司 | Physical downlink control channel (PDCCH) blind detection method |
| CN107040358A (en) * | 2016-02-04 | 2017-08-11 | 株式会社Kt | The method and its device of upward signal are sent and received for NB IoT UE |
| CN108307507A (en) * | 2016-08-11 | 2018-07-20 | 株式会社Kt | Method and its equipment for receiving multi-case data |
| CN107708178A (en) * | 2017-09-08 | 2018-02-16 | 中国联合网络通信集团有限公司 | Method for retransmitting information and base station |
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|---|---|
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