CN114430309B - Blind detection method, device, equipment and medium for narrowband physical downlink control channel - Google Patents
Blind detection method, device, equipment and medium for narrowband physical downlink control channel Download PDFInfo
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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
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Abstract
The invention discloses a blind detection method of a narrow-band physical downlink control channel, which comprises the following steps: receiving continuous NPDCCH subframe information of the maximum repetition number in the search space; acquiring basic soft bits corresponding to each NPDCCH subframe information under the candidate physical resource mapping information; obtaining candidate soft bits of basic soft bits under different transmission formats; obtaining cache position information corresponding to the candidate soft bits and the cache logic; updating or merging the historical candidate soft bits in the buffer area according to the historical candidate soft bits corresponding to the candidate soft bits and the buffer position information; obtaining a detection soft bit corresponding to the current detection according to the blind detection logic; performing de-rate matching on the detection soft bit corresponding to the current detection to obtain a target soft bit; decoding the target soft bit to obtain a target hard bit; and checking the target hard bit to obtain a checking result, and determining the sending information according to the buffer memory area position corresponding to the detected soft bit which is correctly detected. The method is used for improving the blind detection efficiency of the system.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a blind detection method, apparatus, device, and medium for a narrowband physical downlink control channel.
Background
At present, a narrowband internet of things (Narrow Band Internet ofThings, NB-IoT) communication system has the technical characteristics of low speed, low power consumption, low cost, wide coverage, mass equipment connection and the like, and is mainly applied to scenes such as low throughput, high delay tolerance, low mobility and the like.
In an NB-IoT communication system, narrowband physical downlink control channels (Narrowband Physical Downlink Control Channel, NPDCCH) are used to carry control information and are transmitted on 1 or 2 consecutive narrowband control channel resources (Narrowband Control Channel Element, NCCE), each NPDCCH subframe defining 2 NCCE time-frequency resources, NCCE0 and NCCE1, NCCE consisting of 6 consecutive subcarriers on one subframe, where NCCE0 occupies subcarriers 0-5 and NCCE1 occupies subcarriers 6-11. A User Equipment (UE) can only determine that an NPDCCH will transmit the NPDCCH within a Resource Block (RB), but cannot determine which NCCEs have control information transmitted and the actual number of repetitions thereof. Therefore, after the PDCCH channel determines information such as physical resource information and search space Type, the UE searches for the NPDCCH according to different Radio Network temporary identifier (Radio Network TemporaryIdentity, RNTI) types in three search spaces such as a UE specific search space (UE Special Search Space, USS), a Type-1 common search space (Type-1 Common Search Space,Type-1 CSS) and a Type-2 common search space (Type-2 Common Search Space,CSS), because the UE does not determine the time-frequency position of the NPDCCH, the UE can only demodulate the time-frequency position candidate set of the NPDCCH, which is called as blind detection of the NPDCCH. The NPDCCH blind detection algorithm under the existing NB-IoT communication system has the advantages of large soft bit processing calculation amount, more soft bit buffer units, complex blind detection logic and low system operation efficiency, and can not meet the application requirements of low power consumption and low cost of the NB-IoT of the narrowband Internet of things.
Therefore, there is a need for an NPDCCH blind detection method that can improve the disadvantage of low blind detection efficiency of the internet of things system.
Disclosure of Invention
The embodiment of the invention provides a blind detection method, a blind detection device and a storage medium for a narrow-band physical downlink control channel, which are used for improving the blind detection efficiency of an Internet of things system.
In a first aspect, the present invention provides a blind detection method for a narrowband physical downlink control channel, where the method includes: receiving one or more continuous narrowband physical downlink control channel NPDCCH subframe information in the maximum repetition number in the search space; acquiring basic soft bits corresponding to each NPDCCH subframe information under the candidate physical resource mapping information; acquiring candidate soft bits of the basic soft bits under different transmission formats; obtaining cache position information corresponding to the candidate soft bits and the cache logic; updating or merging the historical candidate soft bits in the buffer area according to the historical candidate soft bits corresponding to the candidate soft bits and the buffer position information; obtaining a detection soft bit corresponding to the current detection according to the blind detection logic; performing de-rate matching on the detection soft bit corresponding to the current detection to obtain a target soft bit; decoding the target soft bit to obtain a target hard bit; checking the target hard bit to obtain a checking result; and determining the NPDCCH sending information according to the buffer position corresponding to the checking correct detection soft bit.
The blind detection method of the narrow-band physical downlink control channel has the beneficial effects that: the NPDCCH blind detection of different search space types, different transmission formats and different repetition times of the NPDCCH can be flexibly realized through the simplified detection logic and a buffer unit, so that the purposes of simplifying software and hardware interaction logic, reducing soft bit calculation amount and soft bit information buffer unit and improving the blind detection efficiency of the system are achieved.
In one possible implementation manner, after the verification result is obtained, the method further includes: if the current verification result is correct, confirming DCI information; if the current detection result is wrong and the candidate soft bit blind detection flow is not finished, the detection soft bit demodulation, decoding and checking operation of the next buffer area are continued.
In one possible implementation manner, updating the historical candidate soft bits in the buffer area according to the historical candidate soft bits corresponding to the candidate soft bits and the buffer position information includes: obtaining combined soft bits according to the historical candidate soft bits corresponding to the candidate soft bits and the cache position information, and updating the historical candidate soft bits in the cache area by utilizing the combined soft bits; or replacing the historical candidate soft bits in the buffer area by the candidate soft bits.
In one possible implementation, receiving one or more consecutive NPDCCH subframe information within a maximum number of repetitions in a search space includes: and receiving one or more pieces of continuous NPDCCH subframe information in the maximum repetition number in the search space according to the type of the search space and the corresponding initial receiving position.
In a possible implementation manner, the acquiring basic soft bits corresponding to each NPDCCH subframe information under the candidate physical resource mapping information includes:
when the resource mapping ranges corresponding to the candidate aggregation level are three of NCCE0& NCCE1, NCCE0 and NCCE1, obtaining basic soft bit 1 according to the NCCE0& NCCE1 resource mapping range of the current search space aggregation level 2 by equalization and QPSK demodulation processing; according to the NCCE0 resource mapping range of the current search space aggregation level 1, obtaining basic soft bits 2 through equalization and QPSK demodulation processing; and according to the NCCE1 resource mapping range of the current search space aggregation level 1, performing equalization and QPSK demodulation processing to obtain a basic soft bit 3.
In one possible implementation, obtaining the detected soft bits corresponding to the current detection according to the blind detection logic includes:
when the number of the received NPDCCH subframes is equal to the number of the candidate repetition times of the current search space, reading the continuous buffer areas one by one, wherein the read buffer area soft bits are used as the current detection soft bits.
In a second aspect, an embodiment of the present invention further provides a blind detection apparatus for a narrowband physical downlink control channel, where the apparatus includes a module/unit configured to perform a method according to any one of the possible designs of the first aspect. These modules/units may be implemented by hardware, or may be implemented by hardware executing corresponding software.
In a third aspect, an embodiment of the present invention provides a terminal device, including a processor and a memory. Wherein the memory is for storing one or more computer programs; the one or more computer programs stored in the memory, when executed by the processor, enable the terminal device to implement the method of any one of the possible designs of the second aspect described above.
In a fourth aspect, embodiments of the present invention also provide a computer readable storage medium, the computer readable storage medium comprising a computer program, which when run on an electronic device causes the electronic device to perform the method of any one of the possible designs of the above aspect.
In a fifth aspect, embodiments of the present invention also provide a method comprising a computer program product, which when run on a terminal, causes the electronic device to perform any one of the possible designs of the above aspect.
Advantageous effects concerning the above second to fifth aspects can be seen from the description of the above first aspect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a physical layer processing and resource mapping structure diagram of NPDCCH according to an embodiment of the present invention;
fig. 2 is a flowchart of an NPDCCH blind detection method provided in an embodiment of the present invention;
fig. 3 is a flowchart of an NPDCCH basic soft bit acquisition method according to an embodiment of the present invention;
fig. 4 is a flowchart of an NPDCCH candidate soft bit acquisition method according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of blind detection logic according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an NPDCCH blind detection device according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
Fig. 1 shows a physical layer processing and resource mapping structure of a narrowband physical downlink control channel (Narrowband Physical Downlink Control Channel, NPDCCH), and after downlink control information (Downlink Control Information, DCI) is received on the physical layer NPDCCH channel, 16-bit cyclic redundancy check (Cyclic Redundancy Check, CRC) is masked, where the masked CRCs of different radio network temporary identifiers (Radio Network Tempory Identity, RNTIs) corresponding to different transmission data types are different, so that a receiver can determine an application scenario of current data transmission by detecting the NPDCCH using different CRC masks. And (3) carrying out tail biting convolutional code (Tail Biting Convolutional Coding, TBCC) coding, rate matching and scrambling on the bits subjected to CRC (cyclic redundancy check) masking, wherein the scrambling sequence is updated once every 4 NPDCCH subframes at maximum, and finally carrying out resource mapping on complex value signals subjected to quadrature phase shift keying (Quadrature Phase Shift Keying, QPSK) modulation according to resource configuration information.
The existing NPDCCH blind detection technology has complex process detection logic, needs at least two blocks of soft bit buffer space to store descrambling and de-rate matching soft bits, and has complex soft bit calculation. Therefore, the invention provides a blind detection method, a blind detection device and a storage medium for a narrow-band physical downlink control channel, and soft bit processing in the whole detection process is realized by a soft bit buffer space through flexible and simple detection logic, so that the calculated amount is reduced, and the blind detection efficiency is improved.
In the description of embodiments of the present invention, the terminology used in the embodiments below is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include, for example, "one or more" such forms of expression, unless the context clearly indicates to the contrary. It should also be understood that in the following embodiments of the present invention, "at least one", "one or more" means one or more than two (including two). The term "and/or" is used to describe an association relationship of associated objects, meaning that there may be three relationships; for example, a and/or B may represent: a alone, a and B together, and B alone, wherein A, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the invention. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise. The term "coupled" includes both direct and indirect connections, unless stated otherwise. The terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.
In embodiments of the invention, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "for example" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.
In order to make the objects, technical solutions and advantages of the present invention more clear, the following describes in further detail a blind detection method, device and storage medium for a narrowband physical downlink control channel disclosed in the present invention with reference to the accompanying drawings and embodiments.
As shown in fig. 2, an embodiment of the present invention provides a blind detection method for a narrowband physical downlink control channel, including the following steps:
s201: one or more consecutive NPDCCH subframe information within a maximum number of repetitions in the search space is received.
Specifically, the receiver receives one or more continuous NPDCCH subframe information within the maximum repetition number in the search space according to the search space type and the corresponding initial receiving position.
S202: and acquiring basic soft bits corresponding to each NPDCCH subframe information under the candidate physical resource mapping information.
Specifically, the process of acquiring the basic soft bit is shown in fig. 3, and specifically includes the following steps: after receiving NPDCCH subframe information, obtaining the baseband time domain data after downsampling, and carrying out Fourier transform to obtain the baseband frequency domain data; channel estimation is carried out on NRS pilot frequency resources according to the resource mapping range of the current search space aggregation level 2 to obtain channel information; descrambling the baseband frequency domain data according to the resource mapping range of the current search space aggregation level 2 to obtain frequency domain control information after interference removal; according to the resource mapping range of the current search space aggregation level 2, carrying out equalization and QPSK demodulation processing on the frequency domain control information after interference solution to obtain soft bit information; and according to the resource mapping ranges corresponding to all candidate aggregation levels in the current search space, the soft bits are disassembled to obtain basic soft bits corresponding to different candidate aggregation levels, wherein the basic soft bit 1 is a demodulation soft bit corresponding to the aggregation level 2, the basic soft bit 2 is a demodulation soft bit corresponding to the aggregation level 1NCCE0, and the basic soft bit 3 is a demodulation soft bit corresponding to the aggregation level 1NCCE 1.
S203: and acquiring candidate soft bits of the basic soft bits under different transmission formats.
In this step, as shown in fig. 4, the candidate soft bit acquisition process includes scrambling code bit sequences corresponding to three resource mapping modes NCCE0& NCCE1, NCCE0 and NCCE1, namely scrambling code bit sequence 1, scrambling code bit sequence 2 and scrambling code bit sequence 3. The base soft bits 1 3 are descrambled using the scrambling code bit sequence 1 3, respectively, to yield candidate soft bits 1 3.
S204: and obtaining the buffer memory position information of the candidate soft bit.
Specifically, a block of Buffer is divided into 4 Buffer areas Buffer1 and Buffer4 according to the difference of 3 search space blind detection tasks. The caching logic for the different search space types is: type-1CSS search space at maximum repetition number R max The N of the number of the subframes of the NPDCCH received in the range meets N percent R max ＝2 n And processing candidate soft bits corresponding to the aggregation level 2 of Buffer1, wherein 1 is less than or equal to 2 n N is less than or equal to N and N is a non-negative integer;type-2 CSS search space at maximum repetition number R max The N of the number of the subframes of the NPDCCH received in the range meets N percent R max ∈{R max /8,R max /4,R max /2,R max R corresponding to aggregation level 2 of Buffer1 4 is processed in 1 max Repeating R/8 times max Repeating R/4 times max 2 repetitions and R max Repeating candidate soft bits 1 time; USS search space at maximum repetition number R max The N of the number of the subframes of the NPDCCH received in the range meets N percent R max ∈{R max /8,R max /4,R max /2,R max R corresponding to aggregation level 2 of Buffer1 4 is processed in 1 max Repeating R/8 times max Repeating R/4 times max 2 repetitions and R max 1 repetition of candidate soft bits and 1.ltoreq.R max And (2) processing candidate soft bits of 1 repetition, NCCE0, NCCE1 and 2 repetitions corresponding to Buffer1 4.
S205: and updating the historical candidate soft bits in the buffer area according to the historical candidate soft bits corresponding to the candidate soft bits and the buffer position information.
Specifically, the soft bit update stored in Buffer1 Buffer4 includes two modes: the method comprises the steps that mode 1 updates and covers cached historical soft bits by utilizing candidate soft bits acquired by a currently latest received NPDCCH subframe; and 2, merging the cached historical soft bits by using the candidate soft bits acquired by the NPDCCH subframe which is received currently and latest, and updating the cached soft bits by using the merged soft bits.
S206: and obtaining the detection soft bit corresponding to the current detection according to the blind detection logic.
Specifically, when the number of received NPDCCH subframes is equal to the number of repetition candidates, as shown in fig. 5, the 4 consecutive Buffer zones Buffer1, buffer2, buffer3 and Buffer4 are read one by one, and the 4 sub-Buffer units, i.e., buffer1, buffer2, buffer3 and Buffer4, are demodulated one by one, and the soft bits of each Buffer zone Buffer are read as the detection soft bits to be detected. It is worth noting that the number of candidate repetitions is less than or equal to the maximum number of repetitions of the search space.
S207: and performing de-rate matching on the detection soft bit corresponding to the current detection to obtain a target soft bit.
In this step, the sub-buffer units to be rate-matched for different search space types and different maximum repetition times are different.
S208: and decoding the target soft bit to obtain a target hard bit.
S209: and checking the target hard bit to obtain a checking result.
Specifically, if the current verification result is correct, confirming DCI information; if the current checking result is wrong and the candidate soft bit blind detection process is not finished, steps S206 to S209 are executed to continue to perform the next buffer detection soft bit demodulation.
Optionally, the present embodiment may further include S210: and determining the NPDCCH sending information according to the buffer position corresponding to the detected soft bit.
In the step, the candidate soft bit detection is correct, i.e. the NPDCCH blind detection is successful, the currently received NPDCCH subframe number is the real repetition number of DCI, the starting subframe position is obtained by combining the NPDCCH starting subframe calculation formula corresponding to the search space, and the repetition number information is added, the UE can know the ending subframe of the NPDCCH, and the starting position information of the NPDSCH and NPUSCH can be obtained according to the NPDCCH ending subframe and the fixed time offset, so as to ensure that the UE processes the service data in time.
By the method, the NPDCCH blind detection flow is simplified by adopting the fixed soft bit buffer logic, and soft bit processing in the whole detection process is realized by adopting one soft bit buffer in the whole process, so that the calculated amount is reduced, and the blind detection efficiency is improved.
Fig. 6 is a schematic structural diagram of a blind detection device for a narrowband physical downlink control channel according to an embodiment of the present invention. As shown in fig. 6, the apparatus includes: bit information receiving section 601, elementary bit acquiring section 602, candidate soft bit acquiring section 603, candidate soft bit storage position acquiring section 604, buffered soft bit updating section 605, detected soft bit acquiring section 606, de-rate matching section 607, decoding processing section 608, verification processing section 609, and determining section 610.
The bit information receiving unit 601 is configured to receive one or more continuous narrowband physical downlink control channel NPDCCH subframe information in a maximum number of repetitions in the search space; a basic natural bit obtaining unit 602, configured to obtain basic soft bits corresponding to each NPDCCH subframe information under the candidate physical resource mapping information; a candidate soft bit obtaining unit 603, configured to obtain candidate soft bits of the basic soft bits under different transmission formats; a candidate soft bit storage location obtaining unit 604, configured to obtain cache location information of the candidate soft bit; a buffered soft bit update unit 605, configured to update or merge the historical candidate soft bits in the buffer area according to the historical candidate soft bits corresponding to the candidate soft bits and the buffered position information; a detection soft bit obtaining unit 606, configured to obtain a detection soft bit corresponding to the current detection according to the blind detection logic; a de-rate matching unit 607, configured to perform de-rate matching on the detected soft bit corresponding to the current detection, and obtain a target soft bit; a decoding processing unit 608, configured to decode the target soft bit to obtain a target hard bit; the checking unit 609 is configured to check the target hard bit to obtain a checking result, and the determining unit 610 is configured to determine NPBCH sending information according to the buffer location corresponding to the detected soft bit that is detected correctly.
Fig. 7 is a block diagram of an electronic device 70 according to an embodiment of the invention. As shown in fig. 7, the electronic device 70 may include: a processor 701, a memory 702, a communication I/O interface 703 and a communication bus 704, wherein the processor 701 is configured to control the overall operation of the narrowband internet of things soft bit processing device 70 to complete all or part of the steps in the above method. The memory 702 is used to store various types of data to support operation at the soft bit processing apparatus 70, which may include, for example, instructions for any application or method operating on the soft bit processing apparatus 70, as well as application-related data. Communication I/O interface 703 provides an interface between processor 701 and other interface modules. A communication bus 704 connects the various circuits of the one or more processors and memory together.
In another exemplary embodiment, a computer readable storage medium is also provided, such as a memory 702, comprising program instructions executable by the processor 701 of the soft bit processing apparatus 70 to perform any of the methods of soft bit processing described above.
From the foregoing description of the embodiments, it will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of functional modules is illustrated, and in practical application, the above-described functional allocation may be implemented by different functional modules according to needs, i.e. the internal structure of the apparatus is divided into different functional modules to implement all or part of the functions described above. The specific working processes of the above-described systems, devices and units may refer to the corresponding processes in the foregoing method embodiments, which are not described herein.
The functional units in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the embodiments of the present invention may be essentially or a part contributing to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform all or part of the steps of the method described in the embodiments of the present invention. And the aforementioned storage medium includes: flash memory, removable hard disk, read-only memory, random access memory, magnetic or optical disk, and the like.
The foregoing is merely a specific implementation of the embodiment of the present invention, but the protection scope of the embodiment of the present invention is not limited to this, and any changes or substitutions within the technical scope disclosed in the embodiment of the present invention should be covered in the protection scope of the embodiment of the present invention. Therefore, the protection scope of the embodiments of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The blind detection method of the narrowband physical downlink control channel is characterized by comprising the following steps:
receiving one or more continuous narrowband physical downlink control channel NPDCCH subframe information in the maximum repetition number in the search space;
acquiring basic soft bits corresponding to each NPDCCH subframe information under the candidate physical resource mapping information;
acquiring candidate soft bits of the basic soft bits under different transmission formats;
obtaining cache position information corresponding to the candidate soft bits and the cache logic;
updating or merging the historical candidate soft bits in the buffer area according to the historical candidate soft bits corresponding to the candidate soft bits and the buffer position information;
obtaining a detection soft bit corresponding to the current detection according to the blind detection logic;
performing de-rate matching on the detection soft bit corresponding to the current detection to obtain a target soft bit;
decoding the target soft bit to obtain a target hard bit;
checking the target hard bit to obtain a checking result;
and determining the NPDCCH sending information according to the buffer position corresponding to the checking correct detection soft bit.
2. The method according to claim 1, further comprising, after the obtaining the verification result:
if the current verification result is correct, confirming DCI information;
if the current detection result is wrong and the candidate soft bit blind detection flow is not finished, the detection soft bit demodulation, decoding and checking operation of the next buffer area are continued.
3. The method of claim 2, wherein updating the historical candidate soft bits in the buffer based on the historical candidate soft bits corresponding to the candidate soft bits and the buffer location information comprises:
obtaining combined soft bits according to the historical candidate soft bits corresponding to the candidate soft bits and the cache position information, and updating the historical candidate soft bits in the cache area by utilizing the combined soft bits;
or replacing the historical candidate soft bits in the buffer area by the candidate soft bits.
4. A method according to any one of claims 1 to 3, wherein receiving one or more consecutive NPDCCH subframe information within a maximum number of repetitions in the search space comprises:
and receiving one or more pieces of continuous NPDCCH subframe information in the maximum repetition number in the search space according to the type of the search space and the corresponding initial receiving position.
5. A method according to any one of claims 1 to 3, wherein obtaining basic soft bits corresponding to each NPDCCH subframe information under candidate physical resource mapping information comprises:
when the resource mapping ranges corresponding to the candidate aggregation level are three of NCCE0& NCCE1, NCCE0 and NCCE1, obtaining basic soft bit 1 according to the NCCE0& NCCE1 resource mapping range of the current search space aggregation level 2 by equalization and QPSK demodulation processing; according to the NCCE0 resource mapping range of the current search space aggregation level 1, obtaining basic soft bits 2 through equalization and QPSK demodulation processing; and according to the NCCE1 resource mapping range of the current search space aggregation level 1, performing equalization and QPSK demodulation processing to obtain basic soft bits 3, wherein NCCE0& NCCE1 comprises the complete set of NCCE0 and NCCE 1.
6. A method according to any one of claims 1 to 3, wherein obtaining the detected soft bits corresponding to the current detection according to blind detection logic comprises:
when the number of the received NPDCCH subframes is equal to the number of the candidate repetition times of the current search space, reading the continuous buffer areas one by one, wherein the read buffer area soft bits are used as the current detection soft bits.
7. A blind detection apparatus for a narrowband physical downlink control channel, comprising:
the bit information receiving unit is used for receiving one or more continuous narrow-band physical downlink control channel NPDCCH subframe information in the maximum repetition number in the search space;
a basic soft bit obtaining unit, configured to obtain basic soft bits corresponding to each NPDCCH subframe information under the candidate physical resource mapping information;
a candidate soft bit obtaining unit, configured to obtain candidate soft bits of the basic soft bits under different transmission formats;
a candidate soft bit storage position obtaining unit, configured to obtain cache position information of the candidate soft bit;
a cache soft bit updating unit, configured to update the historical candidate soft bit in the cache area according to the historical candidate soft bit corresponding to the candidate soft bit and the cache location information;
the detection soft bit acquisition unit is used for acquiring detection soft bits corresponding to the current detection according to the blind detection logic;
the de-rate matching unit is used for performing de-rate matching on the detected soft bits corresponding to the current detection to obtain target soft bits;
the decoding processing unit is used for decoding the target soft bit to obtain a target hard bit;
and the verification processing unit is used for verifying the target hard bit to obtain a verification result.
8. The apparatus according to claim 7, further comprising a determining unit, after the verification result is obtained, configured to:
and determining the NPDCCH sending information according to the buffer position corresponding to the checking correct detection soft bit.
9. A terminal device comprising a memory and a processor, the memory having stored thereon a computer program executable on the processor, which when executed by the processor causes the terminal device to implement the method of any of claims 1 to 6.
10. A computer readable storage medium having a computer program stored therein, characterized in that the computer program, when executed by a processor, implements the method of any of claims 1 to 6.
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