Detection method, device, terminal, and computer program

Abstract

The embodiments of the present application provide a detection method, a device, a terminal, and a storage medium. The method includes the steps of: obtaining a decoding parameter when an NPDCCH decoder decodes DCI; a comparison parameter between an encoding result obtained by an NPDCCH encoder reverse-coding the decoded DCI and the DCI before decoding; and a signal-to-noise ratio of the DCI; obtaining a search space length and a data repetition count of the NPDCCH if the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy a first validity condition; and determining that the DCI is valid if the search space length matches the number of subframes corresponding to the data repetition count. This method can reduce a false detection rate of DCI and improve the accuracy of DCI detection results.

Description

Technical Field

[0001] This application relates to the field of communications, and specifically to a detection method, apparatus, terminal, and storage medium.

Background Art

[0002] Currently, Narrow Band Internet of Things (NB-IoT) is widely applied in many industries such as remote metering, asset tracking, smart parking, and smart agriculture. In an NB-IoT communication system, all key parameter sets required when the terminal side receives downlink data or transmits uplink data are indicated by downlink control information (DCI) carried within the narrowband physical downlink control channel (NPDCCH) transmitted by the network side. Therefore, it is very important to accurately detect DCI.

Summary of the Invention

Problems to be Solved by the Invention

[0003] However, since the wireless environment of NB-IoT is complex and variable, an error detection phenomenon occurs when the terminal side detects DCI. At this time, if the terminal side schedules data based on the incorrect DCI, a large amount of unnecessary data retransmission will occur, causing an abnormality in the data transmission link.

Means for Solving the Problems

[0004] This application provides a detection method, apparatus, terminal, and storage medium.

[0005] The embodiments of this application are The step of obtaining decoding parameters when a decoder of a narrowband physical downlink control channel NPDCCH decodes downlink control information DCI, comparison parameters between an encoding result obtained by encoding the decoded DCI in the reverse direction by an encoder of the NPDCCH and the DCI before decoding, and the signal-to-noise ratio of the DCI, When the decoding parameters, the comparison parameters, and the signal-to-noise ratio satisfy a first valid condition, the step of obtaining the search space length and the data repetition transmission times of the NPDCCH, When the search space length matches the number of subframes corresponding to the data repetition transmission times, the step of determining that the DCI is valid, A detection method is provided.

[0006] Embodiments of the present application are A first acquisition module configured to obtain decoding parameters when a decoder of a narrowband physical downlink control channel NPDCCH decodes downlink control information DCI, comparison parameters between an encoding result obtained by encoding the decoded DCI in the reverse direction by an encoder of the NPDCCH and the DCI before decoding, and the signal-to-noise ratio of the DCI, A second acquisition module configured to obtain the search space length and the data repetition transmission times of the NPDCCH when the decoding parameters, the comparison parameters, and the signal-to-noise ratio satisfy a first valid condition, A first determination module configured to determine that the DCI is valid when the search space length matches the number of subframes corresponding to the data repetition transmission times, A detection device is provided.

[0007] Embodiments of the present application are A terminal including a memory and a processor, wherein a computer program is stored in the memory, and the processor is caused to execute the computer program so as to implement any method described in the embodiments of the present application, A terminal is provided.

[0008] An embodiment of the present application is a recording medium in which a computer program is stored, and a processor executes the computer program so as to implement the method according to any one of the items described in the embodiments of the present application to provide a storage medium.

Brief Description of the Drawings

[0009]

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Modes for Carrying Out the Invention

[0010] The detection method provided by the embodiment of the present application can be applied to the communication system shown in FIG. 1. The communication system may include a network-side device 10 and a terminal 11. The network-side device 10 may be any network-side device compliant with the NB-IoT protocol standard, and the terminal 11 may be a terminal compliant with the NB-IoT protocol standard. For example, it may be a smartphone, a tablet computer, a smartwatch, a fitness tracker, a virtual reality device, and an Internet of Things sensor for a single object, etc. The network-side device 10 transmits NPDCCH to the terminal 11, and the terminal 11 receives and detects the DCI carried in the NPDCCH, and performs downlink data reception or uplink data transmission based on the DCI.

[0011] To more clearly illustrate the object, technical solution and advantages of the present application, the embodiments of the present application will be described in detail below with reference to the drawings. It should be noted that the embodiments in the present application and the features in the embodiments can be arbitrarily combined with each other as long as they do not conflict.

[0012] It should be noted that the execution entity of the method embodiment described below may also be a detection device, and the device can be realized by constituting part or all of the above terminal in a manner of combining software, hardware, or software and hardware. In the embodiments related to the method described below, examples with the terminal as the execution entity will be described.

[0013] As is well known, the wireless environment in which the terminal communicates is complex and changeable. For example, the terminal in the remote metering service is generally underground, and the upper part of the terminal is further shielded by a manhole cover. Therefore, the quality of the wireless environment where the terminal is located is poor, and misdetection of DCI is likely to occur. If the terminal misdetects interference and noise signals and determines them as valid DCI, the terminal will receive downlink data or transmit uplink data according to the wrong scheduling information, resulting in a serious deviation from the actual scheduling flow on the network side. Therefore, a large amount of unnecessary data retransmission may occur in the physical layer and the data link layer, which not only seriously affects the data throughput and causes transmission delay, but also may cause link anomalies due to data congestion. For this reason, the detection method, device, terminal and storage medium provided by the embodiments of the present application aim to further filter the detected DCI and reduce the misdetection rate of DCI.

[0014] FIG. 2 is a flowchart of the detection method provided by the embodiment of the present application. As shown in FIG. 2, the method can include S101 to S103.

[0015] In S101, a decoder parameter for decoding DCI by an NPDCCH decoder, a comparison parameter between an encoding result obtained by reversely encoding the decoded DCI by an NPDCCH encoder and the DCI before decoding, and the signal-to-noise ratio of the DCI are obtained.

[0016] Alternatively, after the terminal obtains a result of passing the Cyclic Redundancy Check (CRC) of the NPDCCH, a decoding parameter, a comparison parameter, and a signal-to-noise ratio of the DCI are respectively obtained. The decoding parameter is an intermediate result output in the process of decoding the DCI, and may be a path metric value, a path cumulative amount, a grid map, etc. generated when decoding the DCI. The terminal obtains an encoding result by reversely encoding the decoded DCI, and obtains a comparison parameter by comparing the encoding result with the DCI before decoding.

[0017] The comparison parameter may be a bit error rate between the encoding result obtained by reversely encoding the decoded DCI and the DCI before decoding, or may be a codeword distribution feature between the encoding result obtained by reversely encoding the decoded DCI and the DCI before decoding. Of course, the terminal can further obtain a comparison parameter by respectively selecting a partial codeword set from the encoding result obtained by reversely encoding the decoded DCI and the DCI before decoding and comparing the differences between the two partial codeword sets. The above signal-to-noise ratio is the signal-to-noise ratio at the input end of the decoder.

[0018] Alternatively, before S101, the method further includes a step of verifying the validity of the information field content of the DCI carried in the NPDCCH.

[0019] Alternatively, after the terminal obtains a result of passing the CRC check of the NPDCCH, it is necessary to verify the validity of the information field content of the DCI carried in the NPDCCH. After passing the validity verification, S101 is continuously executed.

[0020] The process by which the terminal verifies the validity of the DCI information field content is that the terminal analyzes the DCI, obtains the DCI information field content, compares the DCI information field content with the content in the DCI specified by the protocol, and if the DCI information field content does not conform to the protocol specifications, it is determined that the verification of the validity of the DCI information field content fails, and if the DCI information field content conforms to the protocol specifications, it is determined that the verification of the validity of the DCI information field content passes.

[0021] Passing the verification of the validity in the DCI information field content indicates that, considering the content specified by the protocol, the DCI is a DCI that conforms to the protocol specifications. In order to reduce the false detection rate of the DCI, it is necessary to further determine the validity of the DCI.

[0022] If the verification of the validity in the DCI information field content fails, it is determined that the DCI is invalid and the DCI is discarded.

[0023] In S102, when the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy the first valid condition, the search space length and the data repetition transmission times of the NPDCCH are obtained.

[0024] Based on multiple simulation tests, a first threshold corresponding to the decoding parameter, the comparison parameter, and the signal-to-noise ratio can be obtained, and the first threshold can be preset for the terminal. The first threshold includes a first preset decoding parameter threshold, a first preset comparison parameter threshold, and a first preset signal-to-noise ratio threshold.

[0025] In an alternative embodiment, a first valid condition can be set for the decoding parameter, the comparison parameter, and the signal-to-noise ratio respectively. When the decoding parameter, the comparison parameter, and the signal-to-noise ratio each meet the corresponding first valid condition, it indicates that the decoding parameter, the comparison parameter, and the signal-to-noise ratio meet the first valid condition.

[0026] Alternatively, when the decoding parameter is greater than or equal to the first preset decoding parameter threshold, it indicates that the decoding parameter meets the first valid condition. When the comparison parameter is less than or equal to the first preset comparison parameter threshold, it indicates that the comparison parameter meets the first valid condition. When the signal-to-noise ratio is greater than or equal to the first preset signal-to-noise ratio threshold, it indicates that the signal-to-noise ratio meets the first valid condition.

[0027] That is, when the decoding parameter is greater than or equal to the first preset decoding parameter threshold, and the comparison parameter is less than or equal to the first preset comparison parameter threshold, and the signal-to-noise ratio is greater than or equal to the first preset signal-to-noise ratio threshold, it indicates that the decoding parameter, the comparison parameter, and the signal-to-noise ratio meet the first valid condition. When at least one of the decoding parameter, the comparison parameter, and the signal-to-noise ratio does not meet the corresponding first valid condition, it indicates that the decoding parameter, the comparison parameter, and the signal-to-noise ratio do not meet the first valid condition.

[0028] In another alternative embodiment, a decoding parameter, a comparison parameter, and a weight value corresponding to the signal-to-noise ratio are preset, and based on the weight value, the decoding parameter, the comparison parameter, and the signal-to-noise ratio are comprehensively calculated to obtain a comprehensive parameter calculation result. And the first preset parameter threshold (the first preset parameter threshold includes a first preset decoding parameter threshold, a first preset comparison parameter threshold, and a first preset signal-to-noise ratio threshold) is comprehensively calculated to obtain a comprehensive calculation result of the first preset parameter threshold. Then, the comprehensive parameter calculation result is compared with the comprehensive calculation result of the first preset parameter threshold. If the comprehensive parameter calculation result is greater than or equal to the comprehensive calculation result of the first preset parameter threshold, it indicates that the decoding parameter, the comparison parameter, and the signal-to-noise ratio meet the first valid condition. If the comprehensive parameter calculation result is less than the comprehensive calculation result of the first preset parameter threshold, it indicates that the decoding parameter, the comparison parameter, and the signal-to-noise ratio do not meet the first valid condition. Through the above process, the terminal performs a first-stage validity judgment on the DCI.

[0029] When the decoding parameter, the comparison parameter, and the signal-to-noise ratio meet the first valid condition, the terminal can obtain the search space length R of the NPDCCH from the upper layer signaling max and obtain the data repetition transmission times from the corresponding resource allocation-scheduling parameter set in the DCI information field.

[0030] If the format of the DCI is the N0 format, the terminal obtains the uplink data repetition transmission times from the scheduling parameter "Repetition number", and the value of the uplink data repetition transmission times is in the range of {1, 2, 4, 8, 16, 32, 64, 128} but is not limited thereto.

[0031] When the format of the DCI is the N1 format, the terminal obtains the number of times of repeated downlink data transmission from the scheduling parameter "Repetition number", and the value of the number of times of repeated downlink data transmission is in the range of {1, 2, 4, 8, 16, 32, 64, 128, 192, 256, 384, 512, 768, 1024, 1536, 2048}, but is not limited thereto.

[0032] When the format of the DCI is the N2 format, the terminal obtains the number of times of repeated paging data transmission from the scheduling parameter "Repetition number", and the value of the number of times of repeated paging data transmission is in the range of {1, 2, 4, 8, 16, 32, 64, 128, 192, 256, 384, 512, 768, 1024, 1536, 2048}, but is not limited thereto.

[0033] Alternatively, when the decoding parameter, the comparison parameter, and the signal-to-noise ratio do not satisfy the first valid condition, it is determined that the DCI is invalid, and the DCI is discarded.

[0034] In S103, when the search space length matches the number of subframes corresponding to the number of times of repeated data transmission, it is determined that the DCI is valid.

[0035] Alternatively, the terminal obtains the number of subframes occupied by data transmission based on the obtained number of times of repeated data transmission, and determines whether the obtained search space length matches the number of subframes corresponding to the number of times of repeated data transmission. When the search space length matches the number of subframes corresponding to the number of times of repeated data transmission, it is determined that the DCI is valid. That the DCI is valid means that the DCI is a valid DCI for the terminal, which is an accurate DCI and belongs to the terminal, and is not a DCI of other terminals.

[0036] Alternatively, the process of determining that the search space length matches the number of subframes corresponding to the data repetition transmission count may include the steps of: obtaining a preset mismatch parameter corresponding to the DCI based on the format of the DCI; and determining that the search space length matches the number of subframes corresponding to the data repetition transmission count if the number of subframes corresponding to the data repetition transmission count is smaller than the product of the preset mismatch parameter and the search space length.

[0037] A user can preset a preset mismatch parameter corresponding to DCI based on the DCI format. For example, the preset mismatch parameter corresponds to three types of DCI formats, and can preset a parameter indicating the degree of mismatch between the search space length Rmax of the NPDCCH and the number of subframes corresponding to the number of data repetitions. The preset mismatch parameter α N0 corresponds to "DCI Format N0" and has a preset mismatch parameter α N1 corresponds to "DCI Format N1" and has a preset mismatch parameter α N2 Compatible with "DCI Format N2".

[0038] If the DCI is "DCI Format N0", N SF_N0 <α N0 *R max If so, the search space length R max is the number of subframes N corresponding to the number of data repetitions SF_N0 If the DCI is "DCI Format N1", N SF_N1 <α N1 *R max If so, the search space length R max is the number of subframes N corresponding to the number of data repetitions SF_N1 If the DCI is "DCI Format N2", N SF_N2 <αN2 *R max If so, it indicates that the search space length R max matches the number of subframes N corresponding to the data repeated transmission times. SF_N2 is shown.

[0039] In contrast, when the DCI is "DCI Format N0", if N SF_N0 ≥α N0 *R max If so, it indicates that the search space length R max does not match the number of subframes N corresponding to the data repeated transmission times. When the DCI is "DCI Format N1", if N SF_N0 ≥α SF_N1 *R N1 If so, it indicates that the search space length R max does not match the number of subframes N corresponding to the data repeated transmission times. When the DCI is "DCI Format N2", if N max ≥α SF_N1 *R SF_N2 If so, it indicates that the search space length R N2 does not match the number of subframes N corresponding to the data repeated transmission times. max is shown. max If so, it indicates that the search space length R SF_N2 does not match the number of subframes N corresponding to the data repeated transmission times.

[0040] In the detection method provided by the embodiments of the present application, when the terminal acquires the decoding parameter when the NPDCCH decoder decodes the DCI, the comparison parameter between the encoding result obtained by the NPDCCH encoder encoding the decoded DCI in the reverse direction and the DCI before decoding, and the signal-to-noise ratio of the DCI, and when the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy the first effective condition, the terminal acquires the search space length and the data repeated transmission times of the NPDCCH. When the search space length matches the number of subframes corresponding to the data repeated transmission times, it is determined that the DCI is valid.

[0041] That is, the terminal performs a two-stage validity determination on the detected DCI. When both two-stage validity determinations meet the corresponding conditions, it is determined that the DCI is valid, thereby reducing the false detection rate of the DCI and improving the accuracy of the DCI detection result. Further, in the DCI detection process, by considering the matching relationship between the search space length of the NPDCCH and the number of subframes corresponding to the data repetition transmission times, the accuracy of the DCI detection result is further improved.

[0042] Alternatively, when the search space length does not match the number of subframes corresponding to the data repetition transmission times, the method determines that the DCI is valid when the decoding parameter, the comparison parameter, and the signal-to-noise ratio meet the second validity condition, and the second validity condition can include a step higher than the first validity condition.

[0043] Alternatively, based on a plurality of simulation tests, a second threshold corresponding to the decoding parameter, the comparison parameter, and the signal-to-noise ratio can be obtained, and the obtained second threshold can be preset in the terminal.

[0044] Here, the second threshold includes a second preset decoding parameter threshold, a second preset comparison parameter threshold, and a second preset signal-to-noise ratio threshold, and the second preset decoding parameter threshold is greater than the first preset decoding parameter threshold, the second preset comparison parameter threshold is greater than the first preset comparison parameter threshold, and the second preset signal-to-noise ratio threshold is greater than the first preset signal-to-noise ratio threshold.

[0045] It can be understood that when the search space length does not match the number of subframes corresponding to the data repetition transmission times, the second threshold corresponding to the decoding parameter, the comparison parameter, and the signal-to-noise ratio can be set slightly higher than the first threshold, thereby raising the condition for determining the validity of the DCI and more accurately determining the validity of the DCI.

[0046] In an alternative embodiment, a second valid condition can be set for the decoding parameter, the comparison parameter, and the signal-to-noise ratio respectively. When the decoding parameter, the comparison parameter, and the signal-to-noise ratio each meet the corresponding second valid condition, it indicates that the decoding parameter, the comparison parameter, and the signal-to-noise ratio meet the second valid condition.

[0047] Alternatively, when the decoding parameter is greater than or equal to the second preset decoding parameter threshold, it indicates that the decoding parameter meets the second valid condition. When the comparison parameter is less than or equal to the second preset comparison parameter threshold, it indicates that the comparison parameter meets the second valid condition. When the signal-to-noise ratio is greater than or equal to the second preset signal-to-noise ratio threshold, it indicates that the signal-to-noise ratio meets the second valid condition.

[0048] That is, when the decoding parameter is greater than or equal to the second preset decoding parameter threshold, and the comparison parameter is less than or equal to the second preset comparison parameter threshold, and the signal-to-noise ratio is greater than or equal to the second preset signal-to-noise ratio threshold, it indicates that the decoding parameter, the comparison parameter, and the signal-to-noise ratio meet the second valid condition. When at least one of the decoding parameter, the comparison parameter, and the signal-to-noise ratio does not meet the corresponding second valid condition, it indicates that the decoding parameter, the comparison parameter, and the signal-to-noise ratio do not meet the second valid condition.

[0049] In another alternative embodiment, based on a preset decoding parameter, a comparison parameter, and a weight value corresponding to a signal-to-noise ratio, the decoding parameter, the comparison parameter, and the signal-to-noise ratio are comprehensively calculated to obtain a comprehensive parameter calculation result, and the second preset parameter threshold values (the second preset decoding parameter threshold value, the second preset comparison parameter threshold value, and the second preset signal-to-noise ratio threshold value) are comprehensively calculated to obtain a comprehensive calculation result of the second preset parameter threshold values. Then, the comprehensive parameter calculation result is compared with the comprehensive calculation result of the second preset parameter threshold values. If the comprehensive parameter calculation result is greater than or equal to the comprehensive calculation result of the second preset parameter threshold values, it indicates that the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy the second valid condition. If the comprehensive parameter calculation result is less than the comprehensive calculation result of the second preset parameter threshold values, it indicates that the decoding parameter, the comparison parameter, and the signal-to-noise ratio do not satisfy the second valid condition. Through the above process, the terminal performs a second-stage validity determination on the DCI.

[0050] Alternatively, if the decoding parameter, the comparison parameter, and the signal-to-noise ratio do not satisfy the second valid condition, it is determined that the DCI is invalid, and the DCI is discarded.

[0051] According to this embodiment, when the search space length does not match the number of subframes corresponding to the data repetition transmission times, the terminal can further determine the validity of the DCI based on whether the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy the second valid condition. That is, the terminal performs a two-stage validity determination on the detected DCI, and the condition for the second-stage validity determination is higher than the condition for the first-stage validity determination. When both the two-stage validity determinations satisfy the corresponding conditions, it is determined that the DCI is valid, further reducing the false detection rate of the DCI and further improving the accuracy of the DCI detection result.

[0052] To further reduce the false detection rate of DCI, the terminal can further perform a third-stage validity determination on DCI according to the size of the number of subframes corresponding to the data retransmission times. In an alternative embodiment, when the decoding parameter, the comparison parameter, and the signal-to-noise ratio meet the second valid condition, the process of determining that the DCI is valid may be that when the decoding parameter, the comparison parameter, and the signal-to-noise ratio meet the second valid condition, and the number of subframes corresponding to the data retransmission times is smaller than a preset threshold, it may be determined that the DCI is valid.

[0053] Alternatively, when performing a third-stage validity determination on DCI, the terminal determines that the number of subframes corresponding to the data retransmission times is smaller than a preset threshold, and the decoding parameter, the comparison parameter, and the signal-to-noise ratio meet the second valid condition as a result of the second-stage validity determination. In this case, the result of the third-stage validity determination is to determine that the DCI is valid. Here, the user can preset a preset threshold corresponding to the DCI based on the format of the DCI (this preset threshold can indicate the possibility of a deviation between the actual scheduling flow on the terminal side and the network side). For example, the preset threshold corresponds to three types of DCI Format, and the preset threshold β N0 corresponds to "DCI Format N0", and the preset threshold β N1 corresponds to "DCI Format N1", and the preset threshold β N2 corresponds to "DCI Format N2".

[0054] That is, the terminal selects the corresponding preset threshold based on the detected DCI format and performs a third-stage validity determination on the DCI. When the DCI is "DCI Format N0", N SF_N0 <β N0 and when the decoding parameter, the comparison parameter, and the signal-to-noise ratio meet the second valid condition, it is determined that the DCI is valid. When the DCI is "DCI Format N1", N SF_N1 <βN1 and when the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy the second valid condition, it is determined that the DCI is valid, and when the DCI is "DCI Format N2", N SF_N2 <β N0 and when the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy the second valid condition, it is determined that the DCI is valid.

[0055] In another selectable embodiment, when the number of subframes corresponding to the data repeated transmission times is equal to or greater than a preset threshold, the process of determining that the DCI is valid determines that the DCI is valid when the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy a third valid condition, where the third valid condition may be higher than the second valid condition.

[0056] A third threshold corresponding to the decoding parameter, the comparison parameter, and the signal-to-noise ratio (the third threshold is also obtained by multiple simulation tests) can be preset. The third threshold includes a third preset decoding parameter threshold, a third preset comparison parameter threshold, and a third preset signal-to-noise ratio threshold, and the third preset decoding parameter threshold is greater than the second preset decoding parameter threshold, the third preset comparison parameter threshold is greater than the second preset comparison parameter threshold, and the third preset signal-to-noise ratio threshold is greater than the second preset signal-to-noise ratio threshold.

[0057] It can be understood that when the number of subframes corresponding to the data repeated transmission times is equal to or greater than a preset threshold, the third threshold corresponding to the decoding parameter, the comparison parameter, and the signal-to-noise ratio can be set slightly higher than the second threshold, thereby raising the condition for judging the validity of the DCI and determining the validity of the DCI more accurately.

[0058] In an optional embodiment, a third validity condition can be set for each of the decoding parameter, the comparison parameter, and the signal-to-noise ratio, and if the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy the corresponding third validity condition, it is indicated that the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy the third validity condition.

[0059] Alternatively, if the decoding parameter is greater than or equal to the third preset decoding parameter threshold, it indicates that the decoding parameter satisfies the third validity condition; if the comparison parameter is less than or equal to the third preset comparison parameter threshold, it indicates that the comparison parameter satisfies the third validity condition; and if the signal-to-noise ratio is greater than or equal to the third preset signal-to-noise ratio threshold, it indicates that the signal-to-noise ratio satisfies the third validity condition.

[0060] That is, if the decoding parameter is equal to or greater than the third preset decoding parameter threshold, the comparison parameter is equal to or less than the third preset comparison parameter threshold, and the signal-to-noise ratio is equal to or greater than the third preset signal-to-noise ratio threshold, it indicates that the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy the third validity condition. If at least one of the decoding parameter, the comparison parameter, and the signal-to-noise ratio does not satisfy the corresponding third validity condition, it indicates that the decoding parameter, the comparison parameter, and the signal-to-noise ratio do not satisfy the third validity condition.

[0061] In another alternative embodiment, based on a preset decoding parameter, a comparison parameter, and a weight value corresponding to a signal-to-noise ratio, the decoding parameter, the comparison parameter, and the signal-to-noise ratio are comprehensively calculated to obtain a comprehensive parameter calculation result, and the third preset parameter threshold (the third preset decoding parameter threshold, the third preset comparison parameter threshold, and the third preset signal-to-noise ratio threshold) is comprehensively calculated to obtain a comprehensive calculation result of the third preset parameter threshold. Then, the comprehensive parameter calculation result is compared with the comprehensive calculation result of the third preset parameter threshold. If the comprehensive parameter calculation result is greater than or equal to the comprehensive calculation result of the third preset parameter threshold, it indicates that the decoding parameter, the comparison parameter, and the signal-to-noise ratio meet the third valid condition. If the comprehensive parameter calculation result is less than the comprehensive calculation result of the third preset parameter threshold, it indicates that the decoding parameter, the comparison parameter, and the signal-to-noise ratio do not meet the third valid condition.

[0062] Alternatively, if the decoding parameter, the comparison parameter, and the signal-to-noise ratio do not meet the third valid condition, it is determined that the DCI is invalid and the DCI is discarded.

[0063] According to this embodiment, the terminal can further perform a third-level validity determination on the DCI based on the magnitude of the number of subframes corresponding to the data repetition transmission times. If the decoding parameter, the comparison parameter, and the signal-to-noise ratio meet the second valid condition and the number of subframes corresponding to the data repetition transmission times is less than a preset threshold, it is determined that the DCI is valid. If the number of subframes corresponding to the data repetition transmission times is greater than or equal to the preset threshold, it is necessary to determine whether the decoding parameter, the comparison parameter, and the signal-to-noise ratio meet the third-level valid condition to determine the validity of the DCI.

[0064] That is, the terminal performs a three-stage validity determination on the detected DCI, and the conditions for the third-stage validity determination are higher than those for the first-stage validity determination and the second-stage validity determination. When all three stages of validity determination meet the corresponding conditions, it is determined that the DCI is valid, further reducing the false detection rate of the DCI and further improving the accuracy of the DCI detection result. Thereby, when the terminal performs data scheduling based on the accurate and valid DCI, the probability of data retransmission can be reduced, and the data transmission delay can be shortened.

[0065] For the convenience of those skilled in the art to understand, the following uses an example in which the decoding parameter is the path metric value and the comparison parameter is the bit error rate to explain the detection process for the above DCI. Therefore, the first-stage determination threshold (the first bit error rate threshold, the first path metric value threshold, and the first signal-to-noise ratio threshold), the second-stage determination threshold (the second bit error rate threshold, the second path metric value threshold, and the second signal-to-noise ratio threshold), and the third-stage determination threshold (the third bit error rate threshold, the third path metric value threshold, and the third signal-to-noise ratio threshold) are preset. However, the third-stage determination threshold > the second-stage determination threshold > the first-stage determination threshold. As shown in FIGS. 3 and 4, the method may include S201 to S205.

[0066] In S201, after obtaining the result of passing the CRC check of the NPDCCH, the validity of the information field content of the DCI carried in the NPDCCH is verified.

[0067] In S202, after passing the validity verification for the information field content of the DCI, the path metric value generated when the NPDCCH decoder decodes the DCI, the bit error rate between the encoding result of the DCI after decoding by the NPDCCH encoder in the reverse direction and the DCI before decoding, and the signal-to-noise ratio of the DCI at the decoder input end are obtained.

[0068] In S203, based on the first-stage determination threshold, a first-stage validity determination is performed on the bit error rate, the path metric value, and the signal-to-noise ratio.

[0069] As an alternative embodiment, when the bit error rate is less than or equal to a first bit error rate threshold, the path metric value is greater than or equal to a first path metric value threshold, and the signal-to-noise ratio is greater than or equal to a first signal-to-noise ratio threshold, it is determined that the bit error rate, the path metric value, and the signal-to-noise ratio satisfy a first valid condition.

[0070] When the bit error rate is greater than the first bit error rate threshold, and / or the path metric value is less than the first path metric value threshold, and / or the signal-to-noise ratio is less than the first signal-to-noise ratio threshold, it is determined that the bit error rate, the path metric value, and the signal-to-noise ratio do not satisfy the first valid condition.

[0071] As another alternative embodiment, a normalized value r between the bit error rate and the first bit error rate threshold BER_L1 and a normalized value r between the path metric value and the first path metric value threshold PM_L1 and a normalized value r between the signal-to-noise ratio and the first signal-to-noise ratio threshold SNR_L1 are respectively calculated, and based on a preset weight value δ BER_L1 and δ PM_L1 and δ SNR_L1 according to the formula δ BER_L1 ×r BER_L1 +δ PM_L1 ×r PM_L1 +δ SNR_L1 ×r SNR_L1 a first-stage basic determination quantity D1 is calculated, and D1 is compared with a corresponding threshold value. When D1 is greater than or equal to the threshold value, it is determined that the bit error rate, the path metric value, and the signal-to-noise ratio satisfy the first valid condition. When D1 is less than the threshold value, it is determined that the bit error rate, the path metric value, and the signal-to-noise ratio do not satisfy the first valid condition. Here, the threshold value can be obtained by calculation according to the above first-stage determination threshold value and the corresponding weight value.

[0072] In S204, when the bit error rate, the path metric value, and the signal-to-noise ratio satisfy the first valid condition, the search space length of the NPDCCH and the number of data retransmission times are obtained, and the second-stage validity determination is performed on the DCI.

[0073] When the search space length matches the number of subframes corresponding to the number of data retransmission times, it is determined that the DCI is valid. When the search space length does not match the number of subframes corresponding to the number of data retransmission times, a second-stage validity determination is performed on the bit error rate, the path metric value, and the signal-to-noise ratio based on the second-stage determination threshold.

[0074] Alternatively, based on the detected DCI format, the preset mismatch parameter corresponding to the DCI of the format is obtained. When the number of subframes corresponding to the number of data retransmission times is smaller than the product of the preset mismatch parameter and the search space length, it is determined that the search space length matches the number of subframes corresponding to the number of data retransmission times indicated by the DCI. When the number of subframes corresponding to the number of data retransmission times is greater than or equal to the product of the preset mismatch parameter and the search space length, it is determined that the search space length does not match the number of subframes corresponding to the number of data retransmission times indicated by the DCI.

[0075] For the specific description regarding the search space length matching the number of subframes corresponding to the number of data retransmission times, reference can be made to the description of the above embodiments. At the same time, for the above process in which the terminal performs a second-stage validity determination on the bit error rate, the path metric value, and the signal-to-noise ratio based on the second-stage determination threshold, reference can be made to the above process in which the terminal performs a first-stage validity determination on the bit error rate, the path metric value, and the signal-to-noise ratio based on the first-stage determination threshold, and the description thereof is omitted in this embodiment.

[0076] In S205, when the bit error rate, the path metric value, and the signal-to-noise ratio satisfy the second valid condition, a third-stage validity determination is performed on the DCI based on the size of the number of subframes corresponding to the data repetition transmission times.

[0077] When the bit error rate, the path metric value, and the signal-to-noise ratio satisfy the second valid condition, a third-stage validity determination is performed on the DCI. Alternatively, the number of subframes corresponding to the data repetition transmission times is compared with a preset threshold (the preset threshold can indicate the possibility of a deviation between the actual scheduling flow on the terminal side and the network side), and when the number of subframes corresponding to the data repetition transmission times is smaller than the preset threshold, it is determined that the DCI is valid. When the number of subframes corresponding to the data repetition transmission times is greater than or equal to the preset threshold, a third-stage validity determination is performed on the bit error rate, the path metric value, and the signal-to-noise ratio based on the third-stage determination threshold. When the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy the third valid condition, it is determined that the DCI is valid.

[0078] Note that the above process in which the terminal performs a third-stage validity determination on the bit error rate, the path metric value, and the signal-to-noise ratio based on the third-stage determination threshold can refer to the above process in which the terminal performs a first-stage validity determination on the bit error rate, the path metric value, and the signal-to-noise ratio based on the first-stage determination threshold, and the description thereof is omitted in this embodiment.

[0079] According to this embodiment, the terminal performs a three-stage validity determination on the detected DCI, and the condition for the third-stage validity determination is higher than the conditions for the first-stage validity determination and the second-stage validity determination. When all three-stage validity determinations satisfy the corresponding conditions, it is determined that the DCI is valid, further reducing the false detection rate of the DCI and further improving the accuracy of the DCI detection result. Thereby, when the terminal performs data scheduling based on the accurate and valid DCI, the probability of data retransmission can be reduced, and the data transmission delay can be shortened.

[0080] FIG. 5 is a schematic structural diagram of a detection device provided by an embodiment of the present application. As shown in FIG. 5, the device may include a first acquisition module 20, a second acquisition module 21, and a first determination module 22.

[0081] Alternatively, the first acquisition module 20 is set to acquire the decoding parameter when the decoder of the NPDCCH decodes the DCI, the comparison parameter between the encoding result of the encoder of the NPDCCH after reverse encoding the decoded DCI and the DCI before decoding, and the signal-to-noise ratio of the DCI.

[0082] When the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy a first valid condition, the second acquisition module 21 is set to acquire the search space length and the data repetition transmission times of the NPDCCH.

[0083] When the search space length matches the number of subframes corresponding to the data repetition transmission times, the first determination module 22 is set to determine that the DCI is valid.

[0084] In the detection device provided by the embodiment of the present application, the terminal acquires the decoding parameter when the decoder of the NPDCCH decodes the DCI, the comparison parameter between the encoding result of the encoder of the NPDCCH after reverse encoding the decoded DCI and the DCI before decoding, and the signal-to-noise ratio of the DCI, and when the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy a first valid condition, acquires the search space length and the data repetition transmission times of the NPDCCH, and when the search space length matches the number of subframes corresponding to the data repetition transmission times, determines that the DCI is valid. That is, the terminal performs a two-stage validity determination on the detected DCI, and when both of the two-stage validity determinations satisfy the corresponding conditions, determines that the DCI is valid, thereby reducing the false detection rate of the DCI and improving the accuracy of the detection result of the DCI.

[0085] In addition, in the DCI detection process, by considering the matching relationship between the search space length of the NPDCCH and the number of subframes corresponding to the data repetition transmission times, the accuracy of the DCI detection result is further improved.

[0086] Alternatively, according to the above embodiment, the apparatus further includes a second determination module.

[0087] Alternatively, when the search space length does not match the number of subframes corresponding to the data repetition transmission times, the second determination module is used to determine that the DCI is valid when the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy a second valid condition, and the second valid condition is higher than the first valid condition.

[0088] Alternatively, according to the above embodiment, the second determination module is specifically used to determine that the DCI is valid when the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy a second valid condition and the number of subframes corresponding to the data repetition transmission times is smaller than a preset threshold.

[0089] Alternatively, according to the above embodiment, when the number of subframes corresponding to the data repetition transmission times is greater than or equal to a preset threshold, the second determination module is specifically used to determine that the DCI is valid when the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy a third valid condition, where the third valid condition is set to be higher than the second valid condition.

[0090] Alternatively, according to the above embodiment, the second determination module is further set to determine that the DCI is invalid and discard the DCI when the decoding parameter, the comparison parameter, and the signal-to-noise ratio do not satisfy the second valid condition.

[0091] Alternatively, according to the above embodiment, the apparatus further includes a validity verification module. Alternatively, the validity verification module is configured to verify the validity of the information field content of the DCI carried in the NPDCCH before obtaining the signal-to-noise ratio of the DCI, using the decoding parameters when the decoder of the first acquisition module 20 decodes the DCI, the comparison parameters between the encoding result of the encoder of the NPDCCH encoding the decoded DCI in the reverse direction and the DCI before decoding.

[0092] Alternatively, according to the above embodiment, the first determination module 22 is specifically configured to obtain a preset mismatch parameter corresponding to the DCI based on the format of the DCI, and determine that the search space length matches the number of subframes corresponding to the data repetition transmission times when the number of subframes corresponding to the data repetition transmission times is smaller than the product of the preset mismatch parameter and the search space length.

[0093] Alternatively, the decoding parameter is a path metric value, and the comparison parameter is a bit error rate.

[0094] According to an embodiment, a terminal is provided, and its internal structure diagram is as shown in FIG. 6. The terminal includes a processor, a memory, a network interface, a display, and an input device connected via a system bus. Here, the processor of the terminal is used to provide computing and control capabilities.

[0095] The memory of the terminal includes a non-volatile 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 executing the operating system and the computer program in the non-volatile storage medium.

[0096] The network interface of the terminal is used to communicate with peripheral devices via a network connection. The computer program is executed by a processor to implement a detection method. The display of the terminal may be a liquid crystal display or an electronic ink display. The input device of the terminal may be a touch layer covering the display, a key, a trackball or a touch pad installed in the terminal housing, or an externally connected keyboard, touch pad or mouse, etc.

[0097] As can be understood by those skilled in the art, the structure shown in FIG. 6 is merely a block diagram of some structures related to the solution means of the present application, and does not limit the terminal to which the solution means of the present application is applied. A specific terminal may include more or fewer members than those shown in the figure, or may combine some members, or have a different member layout.

[0098] According to an embodiment, a terminal including a memory and a processor is provided, and a computer program is stored in the memory. By causing the processor to execute the computer program. Steps of obtaining decoding parameters when a decoder of NPDCCH decodes DCI, comparison parameters between an encoding result obtained by encoding the decoded DCI in the reverse direction by an encoder of NPDCCH and the DCI before decoding, and obtaining the signal-to-noise ratio of the DCI. When the decoding parameters, the comparison parameters, and the signal-to-noise ratio satisfy a first valid condition, steps of obtaining the search space length and the data repetition transmission times of the NPDCCH. When the search space length matches the number of subframes corresponding to the data repetition transmission times, steps of determining that the DCI is valid. To be realized.

[0099] According to one embodiment, when the search space length does not match the number of subframes corresponding to the data repeated transmission times, by the processor executing a computer program, further, when the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy a second valid condition, it is determined that the DCI is valid, and the second valid condition realizes a step higher than the first valid condition.

[0100] According to one embodiment, by the processor executing a computer program, further, when the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy a second valid condition, and the number of subframes corresponding to the data repeated transmission times is smaller than a preset threshold, the step of determining that the DCI is valid is realized.

[0101] According to one embodiment, when the number of subframes corresponding to the data repeated transmission times is greater than or equal to a preset threshold, by the processor executing a computer program, further, when the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy a third valid condition, it is determined that the DCI is valid, where the third valid condition realizes a step higher than the second valid condition.

[0102] According to one embodiment, by the processor executing a computer program, further, when the decoding parameter, the comparison parameter, and the signal-to-noise ratio do not satisfy the second valid condition, it is determined that the DCI is invalid, and the step of discarding the DCI is realized.

[0103] According to one embodiment, by the processor further executing a computer program, the step of verifying the validity of the information field content of the DCI carried in the NPDCCH is realized.

[0104] According to an embodiment, by a processor executing a computer program, further, based on the format of the DCI, a step of obtaining a preset mismatch parameter corresponding to the DCI, and when the number of subframes corresponding to the number of times of data repeated transmission is smaller than the product of the preset mismatch parameter and the search space length, a step of determining that the search space length matches the number of subframes corresponding to the number of times of data repeated transmission are realized.

[0105] Alternatively, the decoding parameter is a path metric value, and the comparison parameter is a bit error rate.

[0106] According to an embodiment, a computer-readable storage medium storing a computer program is provided, by a processor executing a computer program, a step of obtaining a decoding parameter when an NPDCCH decoder decodes a DCI, a comparison parameter between an encoding result obtained by an NPDCCH encoder reversely encoding the decoded DCI and the DCI before decoding, and a signal-to-noise ratio of the DCI; when the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy a first valid condition, a step of obtaining a search space length and a number of times of data repeated transmission of the NPDCCH; when the search space length matches the number of subframes corresponding to the number of times of data repeated transmission, a step of determining that the DCI is valid; are realized.

[0107] According to an embodiment, when the search space length does not match the number of subframes corresponding to the number of times of data repeated transmission, by a processor executing a computer program, further, when the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy a second valid condition, it is determined that the DCI is valid, and the second valid condition is higher than the first valid condition are realized.

[0108] According to one embodiment, by the processor executing a computer program, further, when the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy a second valid condition, and the number of subframes corresponding to the data repeated transmission times is smaller than a preset threshold, the step of determining that the DCI is valid is realized.

[0109] According to one embodiment, when the number of subframes corresponding to the data repeated transmission times is greater than or equal to a preset threshold, by the processor executing a computer program, further, when the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy a third valid condition, it is determined that the DCI is valid, where the third valid condition is higher than the second valid condition, and the step is realized.

[0110] According to one embodiment, by the processor executing a computer program, further, when the decoding parameter, the comparison parameter, and the signal-to-noise ratio do not satisfy the second valid condition, it is determined that the DCI is invalid, and the step of discarding the DCI is realized.

[0111] According to one embodiment, by the processor executing a computer program, further, the step of verifying the validity of the information field content of the DCI carried in the NPDCCH is realized.

[0112] According to one embodiment, by the processor executing a computer program, further, the step of obtaining a preset mismatch parameter corresponding to the DCI based on the format of the DCI, and when the number of subframes corresponding to the data repeated transmission times is smaller than the product of the preset mismatch parameter and the search space length, the step of determining that the search space length matches the number of subframes corresponding to the data repeated transmission times is realized.

[0113] Alternatively, the decoding parameter is a path metric value, and the comparison parameter is a bit error rate.

[0114] The detection device, terminal, and storage medium provided by the above embodiments can execute the detection method provided by any embodiment of the present application, and have corresponding functional modules and beneficial effects for executing the method. For technical details not described in detail in the above embodiments, reference can be made to the detection method provided by any embodiment of the present application.

[0115] The above description is only an exemplary embodiment of the present application and does not limit the protection scope of the present application.

[0116] Those skilled in the art should understand that the term user terminal includes any suitable type of wireless user device, such as, for example, a mobile phone, a portable data processing device, a portable network access device, or an in-vehicle mobile station.

[0117] Generally, each embodiment of the present application is implemented by hardware, a dedicated circuit, software, a logic circuit, or any combination thereof. Some of the components are implemented by hardware, and other parts can be implemented by firmware or software that can be executed by a controller, a microprocessor, or other computing devices. Note that the present application is not limited thereto.

[0118] The embodiments of the present application may also be realized by causing a computer program command to be executed by a data processor of a mobile device, and may be realized, for example, by a processor entity, hardware, or a combination of software and hardware. The computer program command may include assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or target code described in any combination of one or more programming languages.

[0119] The block diagrams of all the logic flows described in the drawings of the present application can represent program steps, or interconnected logic circuits, modules and their functions, or a combination of program steps and their logic circuits, modules and their functions.

[0120] A computer program may be stored in a memory. The memory can have any type suitable for the local technical environment and can be implemented with any corresponding data storage technology, for example, read-only memory (ROM), random access memory (RAM), optical memory devices and systems (digital versatile disc (DVD) or compact disc (CD)), etc., but is not limited thereto.

[0121] The computer-readable medium may include a non-transitory computer-readable storage medium. The data processor can have any type suitable for the local technical environment, for example, a general-purpose computer, a dedicated computer, a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (FPGA), and a processor based on a multi-core processor structure, but is not limited thereto.

[0122] As described above, the details of the exemplary embodiments of the present application have been explained by way of illustrative and non-limiting examples. However, various modifications and changes to the above embodiments made based on the drawings and the claims will be apparent to those skilled in the art and do not depart from the scope of the present application. Therefore, the appropriate scope of the present application is limited by the claims.

Claims

1. Steps of obtaining a decoding parameter when a decoder of a narrowband physical downlink control channel NPDSCH decodes downlink control information DCI, a comparison parameter between an encoding result obtained by encoding the decoded DCI in the reverse direction by an encoder of the NPDSCH and the DCI before decoding, and a signal-to-noise ratio of the DCI, wherein the decoding parameter includes at least one of a path metric value, a path cumulative amount, or a grid map generated when decoding the DCI, When the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy a first valid condition, obtaining the search space length of the NPDSCH from upper layer signaling, and obtaining the number of data repetition transmissions from a corresponding resource allocation-scheduling parameter set in the DCI information field, When the search space length matches the number of subframes corresponding to the number of data repetition transmissions, determining that the DCI is valid, including, The step of determining that the search space length matches the number of subframes corresponding to the number of data repetition transmissions is Based on the format of the DCI, obtaining a preset mismatch parameter corresponding to the DCI, When the number of subframes corresponding to the number of data repetition transmissions is smaller than the product of the preset mismatch parameter and the search space length, determining that the search space length matches the number of subframes corresponding to the number of data repetition transmissions, a detection method.

2. When the search space length does not match the number of subframes corresponding to the number of data repetition transmissions, the method further includes When the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy a second valid condition, determining that the DCI is valid, wherein the second valid condition is higher than the first valid condition, the method according to Claim 1.

3. When the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy a second valid condition, the step of determining that the DCI is valid is The method according to claim 2, comprising the step of determining that the DCI is valid when the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy a second valid condition and the number of subframes corresponding to the number of times of data repeated transmission is less than a preset threshold value.

4. When the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy a second valid condition, the step of determining that the DCI is valid is: The method according to claim 2, comprising the step of determining that the DCI is valid if the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy a third valid condition when the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy the second valid condition and the number of subframes corresponding to the number of times of data repeated transmission is greater than or equal to a preset threshold value, wherein the third valid condition is higher than the second valid condition.

5. The method according to any one of claims 2 to 4, comprising the step of determining that the DCI is invalid and discarding the DCI when the decoding parameter, the comparison parameter, and the signal-to-noise ratio do not satisfy the second valid condition.

6. Before the step of obtaining the decoding parameter when a decoder of a narrowband physical downlink control channel NPDDCH decodes downlink control information DCI, a comparison parameter between an encoding result obtained by reversely encoding the decoded DCI by an encoder of the NPDDCH and the DCI before decoding, and the signal-to-noise ratio of the DCI, the method further comprises: The method according to any one of claims 1 to 4, comprising the step of verifying the validity of the information field content of the DCI carried in the NPDDCH.

7. The method according to any one of claims 1 to 4, wherein the decoding parameter is a path metric value and the comparison parameter is a bit error rate.

8. A first acquisition module configured to acquire a decoding parameter when a decoder of a narrowband physical downlink control channel NPDSCH decodes downlink control information DCI, a comparison parameter between an encoding result obtained by encoding the decoded DCI in the reverse direction by an encoder of the NPDSCH and the DCI before decoding, and a signal-to-noise ratio of the DCI, wherein the decoding parameter includes at least one of a path metric value, a path accumulation amount, or a grid map generated when decoding the DCI. A second acquisition module configured to acquire the search space length of the NPDSCH from upper layer signaling and acquire the number of data repetition transmissions from a corresponding resource allocation-scheduling parameter set in the DCI information field when the decoding parameter, the comparison parameter, and the signal-to-noise ratio satisfy a first valid condition. A first determination module configured to determine that the DCI is valid when the search space length matches the number of subframes corresponding to the number of data repetition transmissions. The first determination module acquires a preset mismatch parameter corresponding to the DCI based on the format of the DCI. determines that the search space length matches the number of subframes corresponding to the number of data repetition transmissions when the number of subframes corresponding to the number of data repetition transmissions is smaller than the product of the preset mismatch parameter and the search space length. A detection device configured to realize determining that the search space length matches the number of subframes corresponding to the number of data repetition transmissions.

9. A terminal including a memory and a processor, wherein a computer program is stored in the memory, and the processor is caused to execute the computer program to realize the steps of the method according to any one of claims 1 to 7.

10. A computer program for causing a processor to realize the method according to any one of claims 1 to 7.

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