CN112333121B - Signal detection method and device, computer equipment and storage medium - Google Patents

Signal detection method and device, computer equipment and storage medium Download PDF

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CN112333121B
CN112333121B CN202011360842.XA CN202011360842A CN112333121B CN 112333121 B CN112333121 B CN 112333121B CN 202011360842 A CN202011360842 A CN 202011360842A CN 112333121 B CN112333121 B CN 112333121B
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control channel
demodulation reference
signal
pdcch
channel unit
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CN112333121A (en
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王鹏
汤坚
索忠伟
唐燕华
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Unisoc Chongqing Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0204—Channel estimation of multiple channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0238—Channel estimation using blind estimation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic

Abstract

The embodiment of the application discloses a signal detection method, a signal detection device, computer equipment and a storage medium, wherein the method comprises the following steps: determining a control channel unit set to be detected, wherein the control channel unit set to be detected comprises one or more continuous control channel units; when the demodulation reference signal in the control channel unit is a broadband demodulation reference signal, determining a power parameter of the demodulation reference signal in the target control channel unit and an energy parameter of the PDCCH signal, which are included in the set of control channel units to be detected; and when the power parameter is greater than or equal to a reference power threshold and the energy parameter is greater than or equal to a reference energy threshold, performing channel decoding on a resource unit where the PDCCH signal in the target control channel unit is located. By adopting the embodiment of the application, the signal detection speed can be improved, the power consumption of equipment can be reduced, and data can be effectively scheduled and transmitted.

Description

Signal detection method and device, computer equipment and storage medium
Technical Field
The present application relates to the field of communications technologies, and in particular, to a signal detection method and apparatus, a computer device, and a storage medium.
Background
In the fifth generation wireless communication network New air interface (5G New Radio, 5G NR) technology, before receiving Downlink data, an NR terminal device needs to detect a Physical Downlink Control Channel (PDCCH) to obtain resource information of a data Channel, that is, a Physical Downlink Shared Channel (PDSCH), and the terminal needs to perform blind detection on the PDCCH Channel by configuring candidate sets of different aggregation levels until the configuration of the candidate sets of all aggregation levels is completed or the decoding of the PDCCH Channel is successful.
In the process, when a candidate set of an aggregation level is determined, relevant data is extracted to perform channel decoding, and then cyclic redundancy check is performed, when the determined number of blind tests is too many, a decoding unit is frequently called, so that not only is the detection delay of the PDCCH increased, but also the power consumption of equipment is increased, and resource scheduling and transmission are not facilitated.
Disclosure of Invention
In view of the foregoing problems, embodiments of the present application provide a signal detection method, an apparatus, a computer device, and a storage medium, which can improve the signal detection speed, reduce the power consumption of the device, and effectively schedule and transmit data.
In one aspect, an embodiment of the present application provides a signal detection method, including:
determining a control channel unit set to be detected, wherein the control channel unit set to be detected comprises one or more continuous control channel units;
when the demodulation reference signal in the control channel unit is a broadband demodulation reference signal, determining a power parameter of the demodulation reference signal in the target control channel unit and an energy parameter of the PDCCH signal, which are included in the set of control channel units to be detected;
and when the power parameter is greater than or equal to a reference power threshold and the energy parameter is greater than or equal to a reference energy threshold, performing channel decoding on a resource unit where the PDCCH signal in the target control channel unit is located.
In one aspect, an embodiment of the present application provides a signal detection apparatus, including:
the device comprises a determining module, a judging module and a judging module, wherein the determining module is used for determining a control channel unit set to be detected, and the control channel unit set to be detected comprises one or more continuous control channel units;
the determining module is further configured to determine, when the demodulation reference signal in the control channel unit is a wideband demodulation reference signal, a power parameter of the demodulation reference signal and an energy parameter of the PDCCH signal in the target control channel unit included in the set of control channel units to be detected;
and the decoding module is used for performing channel decoding on the resource unit where the PDCCH signal in the target control channel unit is located when the power parameter is greater than or equal to a reference power threshold value and the energy parameter is greater than or equal to a reference energy threshold value.
Optionally, the determining module is further configured to determine, when the demodulation reference signal in the control signal unit is a narrowband demodulation reference signal, a power parameter of the demodulation reference signal in the target control channel unit included in the set of control channel units to be detected;
the decoding module is further configured to perform channel decoding on a resource unit in which the PDCCH signal in the target control channel unit is located when the power parameter is greater than or equal to the reference power threshold.
Optionally, the determining module is further configured to determine a total power value of the demodulation reference signal in the target control channel unit included in the set of control channel units to be detected, and use the total power value as a power parameter of the demodulation reference signal in the target control channel unit.
Optionally, the determining module is further configured to:
determining a total power value of demodulation reference signals in each control channel unit included in the control channel unit set to be detected;
determining an average power value according to the total power value of the demodulation reference signals in each control channel unit;
and taking the average power value as a power parameter of a demodulation reference signal in a target control channel unit included in the control channel unit set to be detected.
Optionally, the determining module is further configured to:
and determining the total energy value of the PDCCH signals in the target control channel unit included in the control channel unit set to be detected, and taking the total energy value as the energy parameter of the PDCCH signals in the target control channel unit.
Optionally, the determining module is further configured to:
determining a search space type, wherein the search space type comprises any one of a private search space and a public search space;
acquiring configuration parameters of a control resource set matched with the search space type, and determining an aggregation level set corresponding to the search space type;
and determining a control channel unit set to be detected according to the configuration parameters and the target aggregation level in the aggregation level set.
Optionally, the apparatus further includes an obtaining module, wherein:
the acquisition module is used for acquiring configuration parameters for controlling the resource set;
the determining module is configured to determine the type of the demodulation reference signal in the control signal unit according to the configuration parameter of the control resource set; wherein the type of the demodulation reference signal comprises any one of a wideband demodulation reference signal and a narrowband demodulation reference signal.
In another aspect, an embodiment of the present application provides a computer device, including: the signal detection device comprises a network interface, a processor and a memory, wherein the network interface and the processor are connected with the memory, the network interface is used for providing a data communication function, the memory is used for storing a computer program, and the processor is used for calling the computer program to execute the signal detection method according to one aspect of the embodiment of the application.
Accordingly, embodiments of the present application provide a storage medium storing a computer program, where the computer program includes program instructions, and the program instructions are loaded and executed by one or more processors to perform the signal detection method described in one aspect of the embodiments of the present application.
Accordingly, embodiments of the present application provide a computer program product or a computer program comprising computer instructions stored in a computer-readable storage medium. A processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions to cause the computer device to perform a signal detection method according to an aspect.
It can be seen that, in the embodiment of the present application, by determining the type of the demodulation reference signal, especially with respect to the characteristic that the demodulation reference signal in the wideband demodulation reference signal does not necessarily accompany the PDCCH signal, the possibility of channel decoding is considered from two aspects, namely the power parameter of the wideband demodulation reference signal and the energy parameter of the PDCCH signal, so as to more accurately detect the PDCCH signal, and then perform channel decoding, which can reduce the calling of a decoding unit, reduce the power consumption of the device, and improve the signal detection efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flowchart of a signal detection method according to an embodiment of the present application;
fig. 2 is a schematic flow chart of another signal detection method provided in the embodiment of the present application;
fig. 3 is a schematic flowchart of another signal detection method provided in the embodiment of the present application;
fig. 4 is a schematic structural diagram of a signal detection apparatus according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a computer device according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In order to better understand the scheme of the embodiments of the present application, the following first introduces the related terms and concepts that may be involved in the embodiments of the present application.
NR: new Radio, New air interface.
PDCCH: physical Downlink Control Channel, Physical Downlink Control Channel.
DMRS: and demodulating the Reference Signal to demodulate the uplink data and the downlink data in the data transmission process.
REG: resource Element Group, the time domain occupies one OFDM symbol, and the frequency domain occupies a physical Resource unit of one Resource block RB (12 subcarriers continuous in the frequency domain).
CCE: control Channel Element, minimum resource unit for PDCCH transmission.
CORESET: and a Control Resource Set, wherein the time-frequency position of the Control information transmitted by the PDCCH is located in the CORESET.
Search Space: and the search space is used for indicating the position of the PDCCH in the downlink resource grid, and the terminal performs blind detection on the PDCCH at the position indicated by the search space.
CSS: common Search Space, comprising 5 different types, is mainly used during access and cell handover.
And (3) USS: UE-Specific Search Space, used after access.
AL: aggregation level, polymerization grade or degree of polymerization.
REG Bundle: resource Element Group bundle, which is formed by combining consecutive REGs in time domain or frequency domain.
According to the technical scheme of the embodiment of the application, all possible PDCCH candidate sets are determined by combining a control resource set and a search space, and each PDCCH candidate set is a set of control channel elements to be detected and can be determined by configuration parameters obtained in RRC signaling or system messages; then, according to the type of the DMRS, determining a power parameter of the DMRS signal or an energy parameter of the PDCCH signal and the power parameter of the DMRS signal for comparing with corresponding thresholds (namely a reference power threshold and a reference energy threshold); and then, performing blind detection on the signals meeting the conditions according to the comparison result so as to reduce the channel decoding times of a candidate set without PDCCH signal mapping, thereby accelerating the signal detection speed.
Please refer to fig. 1, which is a schematic flow chart of a signal detection method according to an embodiment of the present application, the method includes, but is not limited to, the following steps:
s101, determining a control channel unit set to be detected, wherein the control channel unit set to be detected comprises one or more continuous control channel units.
In one possible embodiment, in the 5G NR system, the PDCCH is mainly used for transmitting downlink control information DCI and an uplink scheduling Grant UL Grant, so that the terminal UE correctly receives a physical downlink shared channel PDSCH and allocates uplink resources for a physical uplink shared channel PUSCH. One PDCCH consists of one or more continuous control resource elements CCE, only one downlink control information DCI format is transmitted, multiplexing does not exist, the number of the distributed CCEs is equal to an aggregation level, the aggregation level AL is divided into five levels of 1, 2, 4, 8 and 16, and one CCE is fixedly composed of 6 resource element groups REG. The control channel element set to be detected is a possible CCE index set corresponding to an aggregation level, namely a PDCCH candidate set, and is composed of one or more continuous control channel elements. Since the frequency domain scheduling range information and the time domain OFDM symbol number information of the PDCCH channel are encapsulated in the control resource set, the time domain starting symbol information and the detection period are encapsulated in the search space, and the UE can only know the transmission range of the PDCCH signal but cannot know the specific location, that is, the frequency domain scheduling range in the control resource set is determined, and the specific resource blocks of the PDCCH signal are not clear, so that only the related configuration parameters are obtained to determine the specific information, especially the control channel unit set to be detected.
S102, when the demodulation reference signal in the control channel unit is the broadband demodulation reference signal, determining the power parameter of the demodulation reference signal and the energy parameter of the PDCCH signal in the target control channel unit included in the set of control channel units to be detected.
In a possible embodiment, since the UE does not know the specific PDCCH transmission time-frequency resource information explicitly, blind detection of the PDCCH can only be completed by continuously demodulating each PDCCH candidate set without stop. But before blind detection, there is a specific pre-detection step for a specific demodulation reference signal type. Although PDCCH and DMRS are frequency division multiplexed, i.e. 12 REs in one resource block, 3 of them are for DMRS and the remaining 9 are for PDCCH, where PDCCH is modulated with quadrature phase shift keying QPSK, this does not mean that there must be PDCCH signals in the resource block where DMRS is present. Note that this situation occurs in the wideband DMRS configuration.
Specifically, the demodulation reference signal type of the control channel element is determined by a configuration parameter, specifically, a precoding granularity (precoding granularity) of a high-layer parameter in CORESET. If precoding granularity is equal to allo contiguous RBs (all consecutive RBs, i.e. the same precoding is used in all REGs within a consecutive RB set in CORESET), then the demodulation reference signal is a wideband DMRS, i.e. a DMRS sequence is transmitted on all REGs of consecutive RBs scheduling PDCCH frequency domain resources in the control resource set, and the wideband DMRS can use PDCCH DMRS in PDCCH and its neighboring RBs for time-domain and frequency-domain joint channel estimation, thereby improving channel estimation accuracy and PDCCH demodulation performance, and in general, the terminal UE does not expect to configure an RB set of CORESET of more than 4 discontinuous RB subsets in the frequency domain.
Under such a condition, a PDCCH signal does not necessarily exist in a control channel unit corresponding to the PDCCH candidate set (i.e., a control channel unit set to be detected), and since the power or energy of the signal may represent the strength of the signal, the power parameter of the demodulation reference signal and the energy parameter of the PDCCH signal included in the PDCCH candidate set may be determined, and the specific determination manner may be determined by calculation or other manners, which is not limited herein. The power parameter may be total power or average power, and accordingly, the energy parameter may be total energy or average energy, and the specific expression of the power parameter and the energy parameter is not limited herein. The target control channel element may be any one or more of one or more continuous control channel elements constituting the PDCCH candidate set, and the finally determined power parameter of the demodulation reference signal and the energy parameter of the PDCCH are both determined by taking the target control channel element as a minimum unit.
In one possible embodiment, the step of determining the power parameter may comprise: firstly, determining the total power value of the demodulation reference signal in the target control channel unit included in the control channel unit set to be detected, and then taking the total power value as the power parameter of the demodulation reference signal in the target control channel unit. For the wideband DMRS, a total power value of the demodulation reference signal of the target control channel element may be calculated, and for different target control elements, the corresponding total power values may be the same or different, and the total power value of the demodulation reference signal of any target control element may be used as a power parameter of the demodulation reference signal.
In a possible embodiment, the step of determining the power parameter may further be: firstly, determining the total power value of demodulation reference signals in each control channel unit included in a control channel unit set to be detected; then, determining an average power value according to the total power value of the demodulation reference signals in each control channel unit; and finally, taking the average power value as a power parameter of a demodulation reference signal in a target control channel unit included in the control channel unit set to be detected. The total power of the DMRSs in all CCEs contained in the PDCCH candidate set is calculated, and then the average power is obtained according to the total power and the polymerization degree (namely the number of the CCEs), at the moment, the average power of the DMRS signals of each CCE is the same, and the average power is taken as the power parameter of the DMRS of the target CCE so as to execute the subsequent comparison process.
In a possible embodiment, the specific step of determining the energy parameter of the PDCCH signal in the target control channel element included in the set of control channel elements to be detected may be: firstly, determining the total energy value of PDCCH signals in a target control channel unit included in a control channel unit set to be detected, and then taking the total energy value as the energy parameter of the PDCCH signals in the target control channel unit. For the PDCCH candidate set, under the configuration condition of the wideband demodulation reference signal, there may be no PDCCH signal, so an energy parameter is needed to assist the determination. Specifically, the total energy of the PDCCH signal in the target CCE constituting the PDCCH candidate set may be calculated, and actually, the total energy includes the energy of noise and the energy of the PDCCH signal. The target control channel element here can be any one or more of one or more consecutive CCEs, and is used as a minimum metric unit for calculating the energy parameter. For example, if the PDCCH candidate set occupies 4 CCEs, the index numbers are 0, 1, 2, and 3, each CCE has a DMRS, but only the CCEs with index numbers 0 and 1 have PDCCH signals, and if the CCE with index number 0 is used as the target CCE, the energy parameter is the total energy of the CCE with index number 0; if the CCE with index number 0 and index number 1 is used as the target CCE, the energy parameter is the CCE energy sum of index number 0 and index number 1. The energy parameters obtained for each CCE may also vary due to the effect of noise on the channel.
Optionally, the power parameter may also be power of the entire PDCCH candidate set, that is, a sum of power of DMRS signals of the target control channel elements, and the energy parameter may also be total energy of the entire PDCCH candidate set, that is, a sum of energy of PDCCH signals in each target control channel element.
S103, when the power parameter is greater than or equal to a reference power threshold and the energy parameter is greater than or equal to a reference energy threshold, performing channel decoding on a resource unit where a PDCCH signal in the target control channel unit is located.
In one possible embodiment, it is necessary for the wideband DMRS to decide whether to decode the PDCCH candidate set or not, both in terms of a power parameter and an energy parameter. In the broadband DMRS, whether PDCCH signals exist in the candidate set cannot be characterized only by the power parameters of the DMRS, and the energy parameter auxiliary judgment of the PDCCH signals is added, so that the channel decoding of the candidate set without PDCCH mapping can be reduced. The reference power threshold and the reference energy threshold may be obtained through simulation, or may be obtained through other methods, which is not limited herein. When the power parameter and the energy parameter are both greater than or equal to the reference thresholds (i.e., the reference power threshold and the reference energy threshold) corresponding thereto, it is indicated that there is a REG where the PDCCH signal is mapped to the target control channel element, that is, there is a PDCCH signal in the RE, and at this time, a channel decoding unit may be called to decode the PDCCH signal, and the specific manner may be to extract the RE where the PDCCH signal in the target control channel element is located to perform channel decoding.
Optionally, in the process of blind detection on the PDCCH candidate set, if all CCEs in the PDCCH candidate set are used as target control channel elements, then REs where PDCCH signals in all CCEs are extracted and decoded.
In summary, the embodiments of the present application have at least the following advantages:
according to the characteristics of the broadband demodulation reference signal, whether the PDCCH signals can be really mapped to the resource units is judged from the power parameter and the energy parameter at the same time to determine the necessity of decoding. Therefore, the position of the PDCCH signal can be accurately judged, the frequent calling of a channel decoding unit is reduced, the decoding accuracy is improved, the blind detection complexity is reduced, and the blind detection efficiency is improved.
Please refer to fig. 2, which is a schematic flow chart of another signal detection method according to an embodiment of the present application, the method includes, but is not limited to, the following steps:
s201, determining a control channel unit set to be detected, wherein the control channel unit set to be detected comprises one or more continuous control channel units.
In one possible embodiment, to determine the set of control channel elements to be detected, the following steps are performed:
first, it is determined whether the search space SearchSpace type is the dedicated search space USS or the common search space CSS for the PDCCH channel. Specifically, the corresponding SearchSpace type may be identified according to the search space ID in the configuration parameter, that is, the SearchSpace ID. In addition, the 5G NR system subdivides the common search space into a Type0-PDCCH common search space for receiving a system message SIB1, a Type0A-PDCCH common search space for receiving other system messages, a Type1-PDCCH common search space for random access, a Type2-PDCCH common search space for a paging procedure, and a Type3-PDCCH common search space for receiving user data. While the dedicated search space has only one type of PDCCH for receiving scheduled user data. The 5G PDCCH adopts a distributed search space distribution scheme, namely the initial position of a candidate set in a search space is not fixed any more, thereby improving the throughput of a communication system and reducing the blocking probability. The search space indicates which downlink resource blocks may carry the PDCCH, and decoding of downlink control information DCI in the PDCCH may be attempted through blind detection of the search space.
Configuration parameters of the control resource set matched with the search space type are obtained, and an aggregation level set corresponding to the search space type is determined. The configuration parameters corresponding to different search space types are different, and the control resource sets and the search spaces belong to a one-to-many relationship, that is, one control resource set can be associated with a plurality of search spaces, but each search space can only be associated with one control resource set, wherein the configuration parameter control resource set ID of a search space, that is, ControlResourceSetId, can indicate a control resource set bound to the search space. Because the proprietary search space and the public search space have different functions for different situations, the aggregation level sets contained in the proprietary search space are different, and the values of the aggregation level sets include 1, 2, 4, 8 and 16 in the proprietary search space. Under a common search space, the aggregation level set includes only 4, 8, and 16 values. The number of PDCCH candidate sets and PDCCH candidate sets included in different aggregation sets are also different.
And finally, determining a control channel unit set to be detected according to the configuration parameters and the target aggregation level in the aggregation level set. The UE obtains corresponding configuration parameters according to the search space and the control resource set associated with the search space, where the configuration parameters may indicate time-frequency resource information of the PDCCH, a scheduling period, a degree of aggregation of a control channel unit that the PDCCH may send, that is, a target aggregation level, and information such as the number of blind tests required for each degree of aggregation (that is, an aggregation level). According to the information, the UE determines the control channel element CCE occupied by each candidate PDCCH (namely the PDCCH candidate set), namely the control channel element set to be detected, by combining a candidate set formula. The PDCCH candidate set formula is as follows:
Figure BDA0002803935120000091
wherein:
1, L-1, i.e. 0; l represents the PDCCH aggregation level, and for CSS, L takes the value {4, 8, 16 }; for USS, L takes the values {1, 2, 4, 8, 16 }; y represents the frequency domain starting position of the PDCCH candidate set; n is a radical ofCCE,pThe number of CCEs in the control resource set p is represented, and the number is started from 0; n isCIIs a cross-carrier indication;
Figure BDA0002803935120000092
representing candidate set indications in a search space s;
Figure BDA0002803935120000101
Figure BDA0002803935120000102
when representing aggregation level L, corresponding to nCIThe number of PDCCH candidate sets;
Figure BDA0002803935120000103
for all nCIIn a configuration
Figure BDA0002803935120000104
A maximum value.
According to this candidate set formula, the positions of all possible starting CCEs can be calculated, because the CCE continuous permutation can obtain the specific time-frequency resource positions of the control channel element set to be detected, that is, the positions of the control channel elements occupied by the PDCCH candidate set, specifically, the indexes of the control channel elements.
S202, when the demodulation reference signal in the control signal unit is the narrowband demodulation reference signal, determining the power parameter of the demodulation reference signal in the target control channel unit included in the control channel unit set to be detected.
When the high-level parameter precoding granularity in the control resource set is equal to sameAsREGbundle (the parameter indicates that the same precoding is used in one REG bundle), the method is configured to be a narrowband DMRS, that is, only the DMRS sequence is sent on the frequency domain resource of the scheduling PDCCH, and the precoding granularity at this time is REG, that is, whether a PDCCH signal exists on a block PRB or not, so that the power parameter of the demodulation reference signal in the target control channel element needs to be determined. The specific determination method may be obtained by calculation, or other methods, and is not limited herein. The power parameter here may be an average power.
Alternatively, the power parameter of the demodulation reference signal is determined in a minimum unit of the target control channel unit. The target control channel element may be any one of one or more consecutive control channel elements constituting the PDCCH candidate set, or a plurality of consecutive control channel elements of the PDCCH candidate set may be the target control channel element. When the target control channel element is a plurality of continuous control channel elements, the power parameter may be the total power of each control channel element, or the average power of the CCE is calculated according to the average power of the resource element group bundle, so as to obtain the average power of the PDCCH candidate set.
Other details of this step may refer to S102 in the embodiment corresponding to fig. 1, which is not described herein again.
S203, when the power parameter is greater than or equal to the reference power threshold, performing channel decoding on a resource unit where the PDCCH signal in the target control channel unit is located.
If the power parameter is greater than or equal to the reference power threshold, the DMRS signal exists, and the PDCCH signal also exists on the corresponding physical resource block PRB, the resource unit where the PDCCH signal in the target control channel unit is located can be subjected to channel decoding, and the PDCCH candidate set with the power parameter less than the reference power threshold is removed, so that the efficiency of data transmission and scheduling is improved.
In summary, the embodiments of the present application include at least the following advantages:
for the narrowband demodulation reference signal, whether a PDCCH signal exists or not is judged from the aspect of power parameters to decide the necessity of decoding. The power parameter adopts any measurement mode of total power or average power, and can pre-judge whether the PDCCH signal exists, so that frequent calling of a channel decoding unit is reduced, hardware computing resources at a terminal side are saved, and the signal detection speed is increased.
Please refer to fig. 3, which is a schematic flow chart of another signal detection method according to an embodiment of the present application, the method includes, but is not limited to, the following steps:
step 1, obtaining a search space s and a corresponding configuration parameter of a control resource set p.
The configuration parameters are acquired from system messages or RRC signaling by the terminal UE, and the search space s parameter set comprises: the method comprises the steps of obtaining the ID of a search space set, the CORESET associated with the search space set, the type of the search space and the DCI format of scheduling, the polymerization degree information included by the search space set and the number of candidate PDCCHs under each polymerization degree, detecting the period (unit is a slot) of the search space set and the slot offset from the beginning of the detection period to the actual detection search space, continuously detecting the number of slots of the search space set, and the time domain OFDM starting symbol position of the CORESET associated with the search space in each slot. One UE can be configured with 1 to 3 CORESET, and is located in a part of bandwidth BWP, and the configuration parameters of the control resource set p include information such as a parameter indicating the number N of resource blocks in the control resource set, a parameter indicating a mapping manner, a parameter indicating the number M of slots of the control resource set, and a parameter indicating the size of a resource unit bundle under an interleaving condition.
Step 2, determining a search space aggregation level set { L }1，L2. . . And the number N of aggregation levels, and initializing an aggregation level counter i to 0.
The aggregation level set and the number of aggregation levels may be determined according to the relevant configuration parameters. The aggregation level present in the space is 1/2/4/8/16. For example, the aggregation level set corresponding to the common search space is {4, 8, 16}, and the number of aggregation levels is 3. The reason why the aggregation level counter is selected to be initialized is that when a signal is subjected to blind detection, a plurality of PDCCH candidate sets corresponding to each aggregation level are provided, and within N aggregation level numbers, it is required to ensure that a blind detection object includes all possible PDCCH candidate sets, but not others, of course, the aggregation level number may also be used as an end condition of the blind detection, and when the aggregation level counter reaches the upper limit of the aggregation level numbers, a required signal is not detected yet, which indicates that no PDCCH signal exists in the resource control set, and the detection process is ended.
Step 3, selecting an aggregation level LiAnd the corresponding number ML of candidate setsiAnd the maximum number of candidate sets MLi,max。
Randomly selecting an aggregation level LiAs a target aggregation level, there is a corresponding number of candidate sets, i.e., how many PDCCH candidate sets are under the target aggregation level. For example, the aggregation level is 8, and there are 2 candidate sets. The maximum candidate set number corresponding to each aggregation level in the 5G NR system is not fixed any more, but is configured by related parameters. It should be noted that the parameters in this step are all selected to obtain the positions of CCEs occupied by the PDCCH candidate set.
Step 4, setting aggregation level LiCorresponding demodulation reference signal power threshold P1th_iAnd PDCCH energy threshold P2th_i。
In a possible embodiment, the power threshold is the aforementioned reference power threshold, and the energy threshold corresponds to the reference energy threshold. The specific mode may be obtained by multiple times of simulation, and the numerical value belonging to the pre-written program may be set or changed by user-defined, and the setting of the threshold value may also be implemented by other modes, which are not limited herein. By setting respective thresholds, whether PDCCH signals exist can be better judged preliminarily, and unnecessary PDCCH candidate sets are prevented from being detected, so that the power consumption of hardware equipment is restrained.
Step 5, initialize candidate set indicator ms_nci＝0。
One of the functions of setting the candidate set indicator is to count whether all possible PDCCH candidate sets corresponding to the aggregation level are detected blindly, that is, when the candidate set indicator reaches the candidate set number MLiAnd if the blind detection is not successful, ending the blind detection of all PDCCH candidate sets under the aggregation level. The candidate set indication can be regarded as different PDCCH candidate set indexes in a plurality of PDCCH candidate sets corresponding to the aggregation level, and all possible candidate set blind tests can be guaranteed not to be omitted by using the indexes.
Step 6, obtaining a candidate set m according to a blind detection formulas_nciOccupied control channel elements.
After the physical resource information and the search space type are determined, the terminal UE searches the PDCCH on the CORESET in different search spaces according to different types of radio network temporary identifiers RNTI, which is called blind detection. For each candidate set with different indications, the time-frequency positions of the occupied CCE are different, that is, the candidate set corresponding to the aggregation level has a plurality of selectable time-frequency resources, and the specific positions of the time-frequency resources are calculated by a blind detection formula, that is, the CCE occupied by each PDCCH candidate set. The blind detection formula has been described in detail in the foregoing embodiments, and is not described herein again.
And 7, extracting data of a resource unit where the demodulation reference signal is located on the control channel unit occupied by the candidate PDCCH for channel estimation.
When determining the CCEs in the resource control sets, resource mapping is required to be performed on the CCEs, each resource control set has two CCE-to-REG mapping modes of interleaving (distributed) and non-interleaving (centralized), the two CCE-to-REG mapping modes are selectable and are indicated by a parameter cceREG-MappingType, a resource unit group bundle during interleaving is indicated by a parameter regBundleSize, the non-interleaving is 6, but each CORESET can only be associated with one CCE-to-REG mapping mode. Since the network may change precoding between resource element group bundles REG Bundle, all channel estimation is done for each REG Bundle, which may lead to sufficiently accurate channel estimation, good PDCCH performance and better beamforming. The RE data where the demodulation reference signal is located is extracted for channel estimation, and the power calculation of the demodulation reference signal can be more accurate. The demodulation reference signal is used for evaluating a wireless channel to facilitate signal demodulation, and the 5G NR can also flexibly configure the demodulation reference signal according to the movement speed of the UE.
And 8, respectively calculating the demodulation reference signal power on each control channel unit occupied by the candidate PDCCH.
After channel estimation, the obtained power value is the power without noise, so that the DMRS signal power of each control channel element CCE occupied by the PDCCH candidate set can be calculated more accurately according to the channel estimation value. In 6 REGs contained in a CCE, if each REG has a DMRS signal configured, the number and the REs in which the REGs are located are fixed and uniformly distributed in the REGs. Due to the flexible and configurable demodulation reference signals, the power of the DMRS signal contained in each CCE is not necessarily the same, and here each CCE may correspond to the target control channel element mentioned in the foregoing embodiments.
And 9, judging whether the signal is a narrow-band demodulation reference signal or not.
And according to the configuration of the high-level parameters in the CORESET, dividing the DMRS types into a broadband DMRS and a narrowband DMRS. The judging step is to judge whether the high-level parameter configuration is the narrowband DMRS, wherein the precoding granularity is different in different DMRS types, and the positions of the DMRS are different. Under the configuration of the narrow-band DMRS, the DMRS can be located on the REG occupied by the PDCCH which the UE tries to decode, and there may not be the DMRS in some resource blocks occupied by the CORESET; under the configuration of the wideband DMRS, the DMRS would be located on all REGs of a set of consecutive resource blocks of the CORESET, and the UE may use the DMRS except for the PDCCH candidate set.
At this time, there are two divisionsAnd the system has different tasks according to different judgment results: if the pre-coding granularity indicates the narrow-band demodulation reference signal, calculating the average power P occupying the DMRS signal power on the CCE1And judging the average power P of the DMRS signal power1Whether it is greater than the power threshold P1th_i. Because when precoding granularity is equal to sameAsREG-bundle (used for indicating that the same precoding is used in one REG bundle), it indicates that the DMRS signal type in CORESET is a narrowband DMRS, it is necessary to obtain the average power P of the DMRS signal power on CCE occupied by the PDCCH candidate set1It may indicate whether a PDCCH signal is present in the PDCCH candidate set. That is, under the narrowband DMRS, it is only necessary to determine whether the average power of the DMRS signal power is greater than a power threshold to indicate whether the PDCCH candidate set has a PDCCH signal, and if the average power of the DMRS signal power is less than the power threshold, the decoding step is skipped.
If the precoding granularity is not equal to sameAsREG-bundle, calculating the average power P occupying the DMRS signal power on the CCE1Extracting data of RE where candidate PDCCH is located and calculating energy P of RE2And determining the average power P1Whether greater than DMRS signal power threshold P1th_iAnd energy P2Whether or not greater than P2th_i. Because the type of the DMRS signal in the CORESET may be another type, that is, a wideband DMRS, when precoding granularity is not equal to sameeasreg-bundle, it is determined that whether the PDCCH signal exists cannot be accurately determined by only the average power of the DMRS signal power, data added to the RE where the PDCCH exists is required to calculate the energy thereof for comprehensive determination, and if the average power is less than the power threshold and the energy is less than the energy threshold, the decoding step is skipped. Therefore, whether the PDCCH signal exists in the PDCCH candidate set or not can be identified more accurately, blind detection of the candidate set without PDCCH signal mapping is reduced, and the purposes of saving computing resources and power consumption of equipment are achieved.
Step 10, at average power P1Greater than DMRS signal power threshold P1th_iOr the average power P1Greater than DMRS signal power threshold P1th_iAnd energy P2Greater than PDCCH energy threshold P2th_iUnder the condition (2), extracting data of RE where candidate PDCCH is locatedAnd (5) channel decoding.
For each different type of DMRS, there are different decoding conditions, i.e. for narrowband DMRS, only the average power P is needed1Greater than DMRS signal power threshold P1th_iFor wideband DMRS, another condition needs to be added when the condition that the DMRS is greater than the power threshold is satisfied: energy P2Greater than PDCCH energy threshold P2th_i. Under any DMRS type, as long as the channel decoding condition is met, the data of the RE where the PDCCH is located can be extracted for channel decoding, and the specific operations comprise QPSK demodulation, descrambling, rate de-matching and Polar decoding. Of course, if any one of the conditions for extracting the data of the RE where the candidate PDCCH is located and performing the channel decoding is not satisfied, the step is skipped, the next candidate PDCCH is detected, which is equivalent to that the candidate set parameter indicates the next candidate PDCCH within the range allowed by the number of candidate sets, and the step 7 is returned to continue to be performed.
And step 11, judging whether the PDCCH decoding CRC result is correct or not.
The CRC is used for receiver error checking to determine whether the data has been decoded accurately, thereby determining whether the data needs to be retransmitted by the transmitter. Generally, as the length of the CRC check codeword increases, the capability of checking and detecting errors at the receiving end is stronger. After channel decoding, if CRC check succeeds to indicate that the candidate PDCCH demodulation succeeds, blind detection is finished, otherwise, the next candidate set is selected for blind detection until CRC check succeeds or all candidate sets are traversed, and blind detection is finished. So the candidate set is indicated by ms_nciAnd taking the aggregation level counter i as a cyclic standard when the CRC fails, specifically, if the CRC fails, increasing the parameter indicated by the candidate set by 1 by self to indicate that the next candidate set corresponding to a certain aggregation level is to be subjected to blind test, and if the parameter indicated by the candidate set is greater than or equal to the number of the candidate sets, increasing the parameter of the aggregation level counter i by 1 by self to indicate that the candidate set corresponding to the next aggregation level is subjected to blind test. For example, if the aggregation level set has 3 aggregation levels (N is 3, i is 0, 1, 2), which are 4, 8, and 16, respectively, the number of corresponding candidate sets is 4, 2, and 1(m is m)s_nci3, 1, 0). If an optional polymerization level of 8 is present, forThe number of candidate sets is 2, when the first candidate set is detected in a blind mode, i is 0, ms_nci0, if the CRC check fails after decoding the first candidate set, then ms_ncWhen m is equal to 1s_ncIf the CRC check after decoding still fails, adjusting i to 1, which is less than the aggregation level number N, indicating the next aggregation level, returning to the step 3 to continue execution, namely performing blind detection on the candidate set of the next aggregation level, and thus completing blind detection of part or all candidate sets in a circulating manner, thereby realizing demodulation of PDCCH signals.
Only one UE can exist in the search space of one PDCCH, namely different UEs cannot be simultaneously located in the same search space, one UE receives demodulated data at the time-frequency position given by two parameter sets of CORESET and SearchSpace according to the possible search space, and when the demodulated CRC is correct and the RNTI is matched, the DCI data can be obtained. Meanwhile, as many search spaces are available, which corresponds to the number of candidate sets candidates, the number of decoding and CRC decoding processes is correspondingly reduced after the candidate sets are filtered.
In summary, the embodiments of the present application include at least the following advantages:
the method comprises the steps of performing pre-detection on a PDCCH candidate set according to different types of demodulation reference signals under different configuration parameters, namely determining whether decoding is performed under the configuration of a narrowband DMRS by adopting whether a power parameter is larger than a reference power threshold value or not, and determining whether decoding is performed under the configuration of a broadband DMRS by adopting whether a power parameter and an energy parameter are larger than corresponding threshold values or not, so that the decoding times are reduced, the decoding accuracy and efficiency are improved, and the power consumption and resources of terminal equipment are further constrained.
Please refer to fig. 4, which is a schematic structural diagram of a signal detection apparatus according to an embodiment of the present disclosure, the apparatus includes, but is not limited to, the following:
a determining module 401, configured to determine a to-be-detected control channel element set, where the to-be-detected control channel element set includes one or more consecutive control channel elements;
the determining module 401 is further configured to determine, when the demodulation reference signal in the control channel unit is a wideband demodulation reference signal, a power parameter of the demodulation reference signal and an energy parameter of the PDCCH signal in the target control channel unit included in the set of control channel units to be detected;
a decoding module 402, configured to perform channel decoding on a resource unit where the PDCCH signal in the target control channel unit is located when the power parameter is greater than or equal to a reference power threshold and the energy parameter is greater than or equal to a reference energy threshold.
Optionally, the determining module 401 is further configured to determine, when the demodulation reference signal in the control signal unit is a narrowband demodulation reference signal, a power parameter of the demodulation reference signal in the target control channel unit included in the set of control channel units to be detected;
the decoding module 402 is further configured to perform channel decoding on a resource unit in which the PDCCH signal in the target control channel unit is located when the power parameter is greater than or equal to the reference power threshold.
Optionally, the determining module 401 is further configured to determine a total power value of the demodulation reference signal in the target control channel unit included in the set of control channel units to be detected, and use the total power value as a power parameter of the demodulation reference signal in the target control channel unit.
Optionally, the determining module 401 is further configured to:
determining a total power value of demodulation reference signals in each control channel unit included in the control channel unit set to be detected;
determining an average power value according to the total power value of the demodulation reference signals in each control channel unit;
and taking the average power value as a power parameter of a demodulation reference signal in a target control channel unit included in the control channel unit set to be detected.
Optionally, the determining module 401 is further configured to:
and determining the total energy value of the PDCCH signals in the target control channel unit included in the control channel unit set to be detected, and taking the total energy value as the energy parameter of the PDCCH signals in the target control channel unit.
Optionally, the determining module 401 is further configured to:
determining a search space type, wherein the search space type comprises any one of a private search space and a public search space;
acquiring configuration parameters of a control resource set matched with the search space type, and determining an aggregation level set corresponding to the search space type;
and determining a control channel unit set to be detected according to the configuration parameters and the target aggregation level in the aggregation level set.
Optionally, the apparatus further includes an obtaining module 403, where:
the obtaining module 403 is configured to obtain configuration parameters of a control resource set;
the determining module 401 is configured to determine the type of the demodulation reference signal in the control signal unit according to the configuration parameter of the control resource set; wherein the type of the demodulation reference signal comprises any one of a wideband demodulation reference signal and a narrowband demodulation reference signal.
For the device embodiments, since they are substantially similar to the method embodiments, reference may be made to some of the descriptions of the method embodiments for relevant points.
Referring to fig. 5, which is a schematic structural diagram of a computer device according to an embodiment of the present disclosure, as shown in fig. 5, the computer device may include a processor 501, a memory 502, a network interface 503, and at least one communication bus 504. The processor 501 is used for scheduling computer programs, and may include a central processing unit, a controller, and a microprocessor; the memory 502 is used to store computer programs and may include high speed random access memory, non-volatile memory, such as magnetic disk storage devices, flash memory devices; a network interface 503 provides data communication functions and a communication bus 504 is responsible for connecting the various communication elements.
Among other things, the processor 501 may be configured to invoke a computer program in memory to perform the following operations:
determining a control channel unit set to be detected, wherein the control channel unit set to be detected comprises one or more continuous control channel units;
when the demodulation reference signal in the control channel unit is a broadband demodulation reference signal, determining a power parameter of the demodulation reference signal in the target control channel unit and an energy parameter of the PDCCH signal, which are included in the set of control channel units to be detected;
and when the power parameter is greater than or equal to a reference power threshold and the energy parameter is greater than or equal to a reference energy threshold, performing channel decoding on a resource unit where the PDCCH signal in the target control channel unit is located.
In a possible embodiment, the processor 501 is configured to:
when the demodulation reference signal in the control signal unit is a narrow-band demodulation reference signal, determining the power parameter of the demodulation reference signal in the target control channel unit included in the control channel unit set to be detected;
and when the power parameter is greater than or equal to the reference power threshold, performing channel decoding on a resource unit where the PDCCH signal in the target control channel unit is located.
In a possible embodiment, the processor 501 is configured to:
and determining a total power value of the demodulation reference signal in the target control channel unit included in the set of control channel units to be detected, and using the total power value as a power parameter of the demodulation reference signal in the target control channel unit.
In a possible embodiment, the processor 501 is configured to:
determining a total power value of demodulation reference signals in each control channel unit included in the control channel unit set to be detected;
determining an average power value according to the total power value of the demodulation reference signals in each control channel unit;
and taking the average power value as a power parameter of a demodulation reference signal in a target control channel unit included in the control channel unit set to be detected.
In a possible embodiment, the processor 501 is configured to:
and determining the total energy value of the PDCCH signals in the target control channel unit included in the control channel unit set to be detected, and taking the total energy value as the energy parameter of the PDCCH signals in the target control channel unit.
In a possible embodiment, the processor 501 is configured to:
determining a search space type, wherein the search space type comprises any one of a private search space and a public search space;
acquiring configuration parameters of a control resource set matched with the search space type, and determining an aggregation level set corresponding to the search space type;
and determining a control channel unit set to be detected according to the configuration parameters and the target aggregation level in the aggregation level set.
In a possible embodiment, the processor 501 is configured to:
acquiring configuration parameters of a control resource set, and determining the type of a demodulation reference signal in a control signal unit according to the configuration parameters of the control resource set;
wherein the type of the demodulation reference signal comprises any one of a wideband demodulation reference signal and a narrowband demodulation reference signal.
It should be understood that the computer device described in the embodiment of the present application may implement the description of the signal detection method in the embodiment, and may also perform the description of the signal detection apparatus in the corresponding embodiment, which is not described herein again. In addition, the description of the beneficial effects of the same method is not repeated herein.
In addition, it should be further noted that, in this embodiment of the present application, a storage medium is further provided, where the storage medium stores a computer program of the foregoing signal detection method, where the computer program includes program instructions, and when one or more processors load and execute the program instructions, the description of the signal detection method according to the embodiment may be implemented, which is not described herein again, and beneficial effects of the same method are also described herein without being described herein again. It will be understood that the program instructions may be deployed to be executed on one computer device or on multiple computer devices that are capable of communicating with each other.
Embodiments of the present application also provide a computer program product or computer program comprising computer instructions stored in a computer-readable storage medium. The computer instructions are read by a processor of a computer device from a computer-readable storage medium, and the computer instructions are executed by the processor to cause the computer device to perform the steps performed in the embodiments of the methods described above.
Finally, it should be further noted that the terms in the description and claims of the present application and the above-described drawings, such as first and second, etc., are merely used to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present application and is not to be construed as limiting the scope of the present application, so that the present application is not limited thereto but rather by the claims appended hereto.

Claims (10)

1. A method of signal detection, comprising:
determining a control channel unit set to be detected, wherein the control channel unit set to be detected comprises one or more continuous control channel units;
when the demodulation reference signal in the control channel unit is a broadband demodulation reference signal, determining a power parameter of the demodulation reference signal in the target control channel unit and an energy parameter of the PDCCH signal, which are included in the set of control channel units to be detected;
and when the power parameter is greater than or equal to a reference power threshold and the energy parameter is greater than or equal to a reference energy threshold, performing channel decoding on a resource unit where the PDCCH signal in the target control channel unit is located.
2. The method of claim 1, wherein the method further comprises:
when the demodulation reference signal in the control signal unit is a narrow-band demodulation reference signal, determining the power parameter of the demodulation reference signal in the target control channel unit included in the control channel unit set to be detected;
and when the power parameter is greater than or equal to the reference power threshold, performing channel decoding on a resource unit where the PDCCH signal in the target control channel unit is located.
3. The method according to claim 1 or 2, wherein the determining the power parameter of the demodulation reference signal in the target control channel element included in the set of control channel elements to be detected comprises:
and determining a total power value of the demodulation reference signal in the target control channel unit included in the set of control channel units to be detected, and using the total power value as a power parameter of the demodulation reference signal in the target control channel unit.
4. The method according to claim 1 or 2, wherein the determining the power parameter of the demodulation reference signal in the target control channel element included in the set of control channel elements to be detected comprises:
determining a total power value of demodulation reference signals in each control channel unit included in the control channel unit set to be detected;
determining an average power value according to the total power value of the demodulation reference signals in each control channel unit;
and taking the average power value as a power parameter of a demodulation reference signal in a target control channel unit included in the control channel unit set to be detected.
5. The method according to claim 1 or 2, wherein determining the energy parameter of the PDCCH signal in the target control channel element included in the set of control channel elements to be detected comprises:
and determining the total energy value of the PDCCH signals in the target control channel unit included in the control channel unit set to be detected, and taking the total energy value as the energy parameter of the PDCCH signals in the target control channel unit.
6. The method of claim 1, wherein said determining a set of control channel elements to be detected comprises:
determining a search space type, wherein the search space type comprises any one of a private search space and a public search space;
acquiring configuration parameters of a control resource set matched with the search space type, and determining an aggregation level set corresponding to the search space type;
and determining a control channel unit set to be detected according to the configuration parameters and the target aggregation level in the aggregation level set.
7. The method of claim 1, wherein the method further comprises:
acquiring configuration parameters of a control resource set, and determining the type of a demodulation reference signal in a control signal unit according to the configuration parameters of the control resource set;
wherein the type of the demodulation reference signal comprises any one of a wideband demodulation reference signal and a narrowband demodulation reference signal.
8. A signal detection device, comprising:
the device comprises a determining module, a judging module and a judging module, wherein the determining module is used for determining a control channel unit set to be detected, and the control channel unit set to be detected comprises one or more continuous control channel units;
the determining module is further configured to determine, when the demodulation reference signal in the control channel unit is a wideband demodulation reference signal, a power parameter of the demodulation reference signal and an energy parameter of the PDCCH signal in the target control channel unit included in the set of control channel units to be detected;
and the decoding module is used for performing channel decoding on the resource unit where the PDCCH signal in the target control channel unit is located when the power parameter is greater than or equal to a reference power threshold value and the energy parameter is greater than or equal to a reference energy threshold value.
9. A computer device, comprising: a network interface, a processor and a memory, the network interface, the processor and the memory being connected, the network interface being configured to provide a data communication function, the memory being configured to store a computer program, the processor being configured to invoke the computer program to perform the signal detection method according to any one of claims 1 to 7.
10. A storage medium storing a computer program comprising program instructions that are loaded and executed by one or more processors to perform the signal detection method of any one of claims 1-7.
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