CN115102668B - PDCCH blind detection method and device in 5G communication system, electronic equipment and storage medium - Google Patents
PDCCH blind detection method and device in 5G communication system, electronic equipment and storage medium Download PDFInfo
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Abstract
The application discloses a PDCCH blind detection method, a PDCCH blind detection device, an electronic device and a storage medium in a 5G communication system. The method comprises the following steps: receiving a target signal sent by network side equipment through PDCCH; processing the target signal to obtain initial CCE positions under all aggregation levels existing in a search space to be blindly detected; acquiring a time-frequency resource grid diagram of the target signal, and sequencing all aggregation levels existing in a search space to be blindly detected according to the time-frequency resource grid diagram to obtain an aggregation level sequence for blind detection; and determining a candidate PDCCH resource block according to the aggregation level sequence and the CCE initial position to carry out blind detection. The blind detection frequency can be effectively reduced, and the blind detection efficiency is improved.
Description
Technical Field
The present disclosure relates to the field of mobile communications technologies, and in particular, to a method, an apparatus, an electronic device, and a storage medium for PDCCH blind detection in a 5G communication system.
Background
From the development of mobile communication to date, the development of four-generation communication technology has been experienced, and the current development situation of the mobile communication direction of the economy and society is changed every time the technology leather is new, and the progress of various industries is promoted. For example, the fourth generation communication technology creates a very magnificent internet economy, realizes communication anytime and anywhere, and solves the problem of free communication between people. However, with the rise of the internet industry, not only needs to meet the communication requirements, but also many new services and new services have been generated, which causes the explosion-type growth of the required mobile data traffic, and at this time, the mobile communication system is difficult to meet the requirement of the mobile data traffic explosion, so that the research on the fifth generation mobile communication system (abbreviated as 5G communication system) is started to solve the problem.
In a 5G communication system, a physical downlink control channel (Physical Downlink Control Channel, abbreviated as PDCCH) controls transmission and reception of uplink and downlink data by transmitting downlink control information (Downlink Control Information, DCI), and is a control core of a physical channel of the 5G communication system. Unlike other channels, the PDCCH carries DCI information that needs to be obtained through blind detection. In long term evolution (Long Term Evolution, abbreviated as LTE) of the general mobile communication technology, the time-frequency resource occupied by the PDCCH is fixed, while in the 5G communication system, the system bandwidth is large, the time-frequency position of the PDCCH is not fixed any more, and the blind detection complexity is greater than that of LTE.
In the prior art, the research result of the PDCCH blind detection scheme in the 5G communication system is less, and the PDCCH blind detection scheme in the LTE system which is mature in technical means is only used as a research reference, so that the problems of high blind detection complexity and low blind detection efficiency exist.
Disclosure of Invention
The embodiment of the application provides a PDCCH blind detection method, a PDCCH blind detection device, an electronic device and a storage medium in a 5G communication system, so as to improve the efficiency of PDCCH blind detection.
The embodiment of the application adopts the following technical scheme:
in a first aspect, an embodiment of the present application provides a PDCCH blind detection method in a 5G communication system, including:
receiving a target signal sent by network side equipment through PDCCH;
processing the target signal to obtain initial CCE positions under all aggregation levels existing in a search space to be blindly detected;
acquiring a time-frequency resource grid diagram of the target signal, and sequencing all aggregation levels existing in a search space to be blindly detected according to the time-frequency resource grid diagram to obtain an aggregation level sequence for blind detection;
and determining a candidate PDCCH resource block according to the aggregation level sequence and the CCE initial position to carry out blind detection.
Optionally, acquiring a time-frequency resource grid graph of the target signal includes:
calculating the energy of the target signal at each frequency point on the frequency domain;
and drawing an energy map at a time-frequency domain position corresponding to the PDCCH according to the energy of the target signal at each frequency point, wherein the energy map is the time-frequency resource grid map.
Optionally, sorting the aggregation levels existing in the search space to be blindly detected according to the time-frequency resource grid diagram to obtain an aggregation level sequence for blind detection, including:
determining the quantity of PDCCH resource blocks in different energy ranges in the time-frequency resource grid diagram;
and sequencing the aggregation levels according to the PDCCH resource block quantity in different energy ranges.
Optionally, determining the candidate PDCCH resource block according to the aggregation level order and the CCE initial position for blind detection, including:
determining a current aggregation level for blind detection according to the aggregation level sequence;
and determining the PDCCH resource block candidates according to the current aggregation level and the CCE initial position under the current aggregation level, and performing blind detection on the PDCCH resource block candidates.
Optionally, blind detection of the PDCCH candidate resource blocks includes:
sequentially demodulating, descrambling, rate-matching, polar code decoding, RNTI descrambling and CRC checking the candidate PDCCH resource blocks;
if the CRC result is correct, the DCI information obtained through the candidate PDCCH resource block is the required DCI information, and the blind detection is ended; and if the CRC check result is incorrect, determining the next aggregation level for blind detection according to the aggregation level sequence, and carrying out blind detection on the next candidate PDCCH resource block corresponding to the next aggregation level until the required DCI information is obtained.
Optionally, processing the target signal to obtain initial CCE positions under each aggregation level existing in a search space to be blindly detected, including:
acquiring a digital baseband signal of the target signal;
synchronizing the downlink signals of the digital baseband signals to obtain a main information block, and analyzing the main information block to obtain the position of a PDCCH resource block of the target signal;
acquiring a demodulation reference signal carried on the PDCCH in the target signal, and carrying out channel estimation and equalization according to the demodulation reference signal carried on the PDCCH and the locally generated demodulation reference signal to obtain an equalized PDCCH resource block;
determining a resource mapping mode from CCE to REG according to the high-level parameters, demapping the balanced PDCCH resource blocks according to the determined resource mapping mode, and recovering the sequence of the PDCCH resource blocks to be the sequence before mapping;
and obtaining the initial position of the CCE under each aggregation level in the search space according to the type of the search space, the aggregation level in the search space and the PDCCH resource block after sequential recovery.
Optionally, when the resource mapping mode is interleaving mapping, demapping the equalized PDCCH resource blocks according to the determined resource mapping mode, and recovering the sequence of the PDCCH resource blocks to the sequence before mapping, including:
performing REG grouping on the balanced PDCCH resource blocks to obtain a plurality of REG bundles;
determining the number of each REG beam according to the current aggregation level, and arranging the numbers of each REG beam in a sequence from small to large to obtain a PDCCH resource block index;
and de-interleaving the balanced PDCCH resource blocks which do not contain demodulation reference signals according to the PDCCH resource block index to obtain PDCCH resource blocks after sequential recovery.
In a second aspect, an embodiment of the present application provides a PDCCH blind detection apparatus in a 5G communication system, including:
a target signal acquisition unit, configured to receive a target signal sent by a network side device through a PDCCH;
the CCE initial position calculation unit is used for processing the target signal to obtain CCE initial positions under all aggregation levels existing in the search space to be blindly detected;
the aggregation level ordering unit is used for acquiring a time-frequency resource grid diagram of the target signal, and ordering all aggregation levels existing in a search space to be blindly detected according to the time-frequency resource grid diagram to obtain an aggregation level sequence for blind detection;
and the blind detection unit is used for determining a candidate PDCCH resource block according to the aggregation level sequence and the CCE initial position to carry out blind detection.
In a third aspect, embodiments of the present application provide an electronic device, including a processor; and a memory arranged to store computer executable instructions that, when executed, cause the processor to perform the method of the above embodiments.
In a fourth aspect, embodiments of the present application provide a computer-readable storage medium storing one or more programs that when executed by a processor implement the methods of the above embodiments.
The above-mentioned at least one technical scheme that this application embodiment adopted can reach following beneficial effect: according to the method and the device for detecting the PDCCH, the network side device is used for processing the target signal by taking the signal sent by the PDCCH as the target signal, so that CCE initial positions under all aggregation levels existing in the search space to be detected blindly are obtained, and sequencing all aggregation levels existing in the search space to be detected blindly according to the time-frequency resource grid diagram corresponding to the target signal.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
fig. 1 is a flow chart of a PDCCH blind detection method in a 5G communication system according to an embodiment of the present application;
fig. 2 is a schematic diagram of a process of performing digital signal processing on a target signal in an embodiment of the present application;
fig. 3 is a schematic diagram of a process of resource block extraction in an embodiment of the present application;
FIG. 4 is a schematic diagram illustrating a channel estimation and equalization process according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a sequential recovery process in an embodiment of the present application;
fig. 6 is a schematic diagram of a procedure of CCE initial position calculation in an embodiment of the present application;
fig. 7 is a schematic diagram of a blind detection process of a PDCCH candidate resource block in an embodiment of the present application;
fig. 8 is a schematic structural diagram of a PDCCH blind detection apparatus in a 5G communication system according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of an electronic device in an embodiment of the present application.
Detailed Description
For the purposes, technical solutions and advantages of the present application, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments of the present application and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In order to facilitate understanding of the embodiments of the present application, a basic procedure of PDCCH blind detection is described herein with reference to a 5G communication scenario between a user terminal and a network side device.
The User Equipment (UE) in the present application may be a terminal-side Device such as a mobile phone, a tablet (Tablet Personal Computer), a Laptop (Laptop Computer), a personal digital assistant (Personal Digital Assistant, PDA), a mobile internet Device (Mobile Internet Device, MID), or a Wearable Device (web Device). It should be noted that, in the embodiments of the present application, the specific type of the user terminal is not limited. In addition, the user terminal in the embodiment of the present application may be a user terminal with different bandwidth capabilities, for example: the method includes a user terminal supporting a wideband, and a user terminal supporting a narrowband, where the user terminal supporting a wideband may be a user terminal supporting a maximum bandwidth frequency band of a carrier (e.g., pcell or Scell), and of course, the method is not limited in this embodiment of the present application, for example: the user terminal supporting the bandwidth may also be a user terminal supporting a preset broadband frequency band (e.g., 400MHz or 300 MHz). The narrowband-supporting ue may be a ue that can only support a part of the bandwidth in the maximum bandwidth of the carrier, for example: only 20MHz or 100MHz user terminals are supported.
The network side device may be a transmission receiving point (Transmission Reception Point, abbreviated as TRP), or may be a base station, which may be a macro station, such as 5GNR (5G New Radio), etc.; the network side device may also be an Access Point (AP). It should be noted that, in the embodiments of the present application, the specific type of the network side device is not limited.
In a 5G communication system, PDCCH mainly performs uplink and downlink scheduling, power control, and the like, and a network side device obtains the channel environment quality status of a user terminal according to a channel quality index (Channel Quality Indicator, abbreviated as CQI) value reported by the user terminal, so as to select a suitable aggregation level (Aggregation Leval, abbreviated as AL), that is, the number of control channel elements (Control Channel Element, abbreviated as CCEs) carrying PDCCH. However, the user terminal does not know the DCI format required for receiving the PDCCH, the number of CCEs carrying DCI information, the location of the information, etc., and the user terminal knows only the information currently required by itself. Thus, the user terminal needs to perform one-to-one detection, i.e. blind detection, on the possible candidates. For different required information, the ue may descramble the cyclic redundancy check (Cyclic Redundancy Check, abbreviated as CRC) according to a corresponding radio network temporary identifier (Radio Network Tempory Identity, abbreviated as RNTI), and if the CRC check is successful, the corresponding DCI information may be obtained, so as to solve the PDCCH information required by the ue.
Basic resource concepts of the PDCCH include a resource element group (Resource Element Group, abbreviated REG), a Control Channel Element (CCE), a control resource set (Control Resource Set, abbreviated CORESET), and a Search Space (SS), among others. REG is a physical Resource unit occupying one OFDM symbol in the time domain and one Resource Block (RB) in the frequency domain, and one REG contains 12 Resource Elements (REs), where 3 REs are used for the bearer of demodulation reference signals (Demodulation Reference Signal, DMRS) and 9 REs are used for the bearer of DCI information. The CCE is a basic unit constituting the PDCCH, one CCE contains 6 REGs, and the number of REGs of one resource element group Bundle (REG Bundle) is configurable, one REG Bundle is composed of 6 REGs when the CCE to REG resource mapping manner is non-interleaving mapping, one REG Bundle is composed of 2, 3 or 6 REGs when interleaving mapping, and a specific number is indicated by a higher layer parameter. A given PDCCH may consist of 1, 2, 4, 8 or 16 CCEs, the number of CCEs constituting the PDCCH being referred to as the Aggregation Level (AL), the specific value of which is determined by the DCI payload size and the required coding rate. The network layer device can adjust the aggregation level of the PDCCH according to the channel environment quality condition of actual transmission, so as to realize the self-adaptive transmission of the link.
In order to reduce the blind detection times, a certain constraint is made on the PDCCH blind detection of the user terminal. For example, in the 5G communication system defined in the latest protocol R15 version, the common search space is refined and divided into 5 different types of search spaces: different expected information can be searched in different spaces, such as a current user terminal needs to receive a residual minimum system message (SIB 1), and then can enter the Type0-PDCCH search space to carry out blind detection; only 6 DCI formats, namely, DCI 0/1_0 and DCI2_0/2_1/2_2/2_3, need to be detected in the common search space, and only one bit length DCI format needs to be blindly detected under the condition that the type of RNTI is known. There may be two kinds of bit length DCI formats for blind detection if the 4 DCI formats, i.e., DCI 0/1_0 and DCI 0/1/1_1, need to be detected in the user terminal-specific search space. Although these changes have greatly reduced the number of blind detections, in the case of exhaustion, the number of times of PDCCH blind detection in one time slot may still reach 44 times, and the excessive blind detection time may cause the performance of the whole system to be reduced, and affect the user experience of the user terminal.
In view of the foregoing, embodiments of the present application provide a method, an apparatus, an electronic device, and a computer readable storage medium for PDCCH blind detection in a 5G communication system, where a signal sent by a network side device is used as a target signal, where the target signal is a 5G signal, and aggregation levels for blind detection are ordered according to a time-frequency resource grid diagram corresponding to the 5G signal, first, blind detection is performed by using a candidate PDCCH resource block corresponding to the most probable correct aggregation level, and when no DCI information is required, blind detection is performed based on a candidate PDCCH resource block corresponding to the next aggregation level in an aggregation level sequence until the required DCI information is obtained.
The following describes in detail the technical solutions provided by the embodiments of the present application with reference to the accompanying drawings.
The embodiment of the application provides a method for detecting PDCCH blindness in a 5G communication system, as shown in fig. 1, and provides a flow chart of the method for detecting PDCCH blindness in the 5G communication system in the embodiment of the application, where the method at least includes steps S110 to S140 as follows:
step S110, receiving a target signal sent by the network side device through the PDCCH.
And step S120, processing the target signal to obtain initial CCE positions under all aggregation levels in the search space to be blindly detected.
Step S130, a time-frequency resource grid diagram of the target signal is obtained, and each aggregation level existing in the search space to be blindly detected is ordered according to the time-frequency resource grid diagram, so that an aggregation level sequence for blind detection is obtained.
The time-frequency resource grid diagram contains the energy distribution condition of the target signal in the PDCCH time-frequency range, and the PDCCH resource blocks under the same aggregation level are in the same energy region on the time-frequency resource grid diagram, so that the embodiment of the application can utilize the time-frequency resource grid diagram to sort all aggregation levels existing in the search space, for example, sort the aggregation levels according to the sequence from the aggregation level most likely to be selected by the network side equipment to the aggregation level least likely to be selected by the network side equipment, so as to obtain an aggregation level sequence, wherein the first aggregation level in the aggregation level sequence refers to the aggregation level most likely to be selected by the network side equipment, the second aggregation level is the second aggregation level, the third aggregation level is the third aggregation level, and the last aggregation level in the aggregation level sequence is the aggregation level least likely to be selected by the network side equipment.
In practical applications, the embodiment of the present application does not limit the execution sequence of step S120 and step S130, and may be executed simultaneously, or may execute step S120 first, then execute step S130, or execute step S130 first, then execute step S120.
And step S140, determining a candidate PDCCH resource block according to the aggregation level sequence and the CCE initial position for blind detection.
Based on the PDCCH blind detection method shown in fig. 1, in the embodiment of the present application, a signal sent by a network side device through a PDCCH is used as a target signal, on one hand, the target signal is processed to obtain CCE initial positions under each aggregation level existing in a search space to be blind detected, on the other hand, each aggregation level existing in the search space to be blind detected is further ordered according to a time-frequency resource grid diagram corresponding to the target signal, so that a candidate PDCCH resource block can be determined according to the CCE initial positions corresponding to the ordered aggregation levels, blind detection can be performed on the determined PDCCH resource block, and inefficiency caused by blind detection based on a disordered exhaustion mode is avoided.
In one embodiment of the present application, obtaining a time-frequency resource grid graph of the target signal includes:
calculating the energy of the target signal at each frequency point on the frequency domain, for example, performing Fourier transform on the target signal, and calculating the energy at each frequency point according to the Fourier transform result; and drawing an energy map at a time-frequency domain position corresponding to the PDCCH according to the energy of the target signal at each frequency point, wherein the energy map is the time-frequency resource grid map.
After the time-frequency resource grid diagram is obtained, sorting the aggregation levels existing in the search space to be blindly detected according to the time-frequency resource grid diagram, specifically:
determining the quantity of PDCCH resource blocks in different energy ranges in the time-frequency resource grid diagram;
and sequencing the aggregation levels according to the PDCCH resource block quantity in different energy ranges.
For example, when a time-frequency resource grid graph is drawn based on MATLAB tools, different energy ranges of the time-frequency resource grid graph are embodied in different colors. In general, the red area on the time-frequency resource grid chart indicates that the signal energy is high, and corresponds to the main part of the signal, and in the PDCCH time-frequency range, the number of resource blocks corresponding to the red area is likely to be the number of resource blocks transmitted based on the aggregation level selected by the network side device. The blue region on the time-frequency resource grid graph indicates that the signal energy is low, corresponding to the edge portion of the signal, which in this embodiment may be other signals independent of the aggregation level.
In one embodiment of the present application, processing the target signal to obtain the initial CCE positions at the respective aggregation levels includes:
acquiring a digital baseband signal of the target signal;
carrying out downlink signal synchronization on the digital baseband signal to obtain a main information block (Master Indication Block, abbreviated as MIB), and analyzing the main information block to obtain the position of a PDCCH resource block of the target signal;
acquiring a demodulation reference signal carried on the PDCCH in the target signal, and carrying out channel estimation and equalization according to the demodulation reference signal carried on the PDCCH and the locally generated demodulation reference signal to obtain an equalized PDCCH resource block;
determining a resource mapping mode from CCE to REG according to the high-level parameters, demapping the balanced PDCCH resource blocks according to the determined resource mapping mode, and recovering the sequence of the PDCCH resource blocks to be the sequence before mapping;
and obtaining the initial position of the CCE under each aggregation level in the search space according to the type of the search space, the aggregation level in the search space and the PDCCH resource block after sequential recovery.
The processing of the target signal in this embodiment includes digital signal processing, resource block extraction, channel estimation and equalization, sequential recovery processing, CCE initial position calculation, and candidate PDCCH resource block blind detection.
As shown in fig. 2, the 5G signal is received through a receiving antenna and converted into an electrical signal that can be processed, the electrical signal is amplified through a low noise amplifier, the amplified electrical signal is subjected to mixing filtering through an analog down converter to obtain an analog intermediate frequency signal, the analog intermediate frequency signal is subjected to high-speed sampling through an analog to digital converter to obtain a digital intermediate frequency signal, and finally the digital intermediate frequency signal is subjected to mixing filtering through the digital down converter to obtain a digital baseband signal.
As shown in fig. 3, the downlink signal is synchronized with the digital baseband signal to obtain MIB, and the MIB is analyzed to obtain time-frequency domain position information occupied by the PDCCH resource block, multiplexing mode and frequency domain offset of the synchronization block (Synchronization Signal Block, abbreviated as SSB), and the PDCCH resource is moved in block spectrum according to the time-frequency domain position information occupied by the PDCCH resource block, the frequency domain offset, and the time-frequency domain position relationship between the PDCCH resource block corresponding to the multiplexing mode and the synchronization block, to obtain the position and number of the PDCCH resource block, and to extract the PDCCH resource block.
As shown in fig. 4, the frequency domain position of the DMRS in the PDCCH resource block is calculated according to the number and the position of the PDCCH resource block, so as to obtain the DMRS carried on the PDCCH in the digital baseband signal. In this embodiment, a local DMRS is generated by using a pseudo random sequence, frequency domain channel estimation is performed according to the DMRS carried on the PDCCH and the local DMRS, so as to obtain channel estimation on a corresponding time-frequency point, frequency domain interpolation processing is performed on discrete channel estimation values, so as to obtain channel estimation on the whole time-frequency resource, and then frequency domain equalization is performed on the PDCCH resource block, so that the channel estimation and equalization process is completed, and an equalized PDCCH resource block is obtained.
As shown in fig. 5, CCE-REG grouping is performed on the equalized PDCCH resource block, and a resource mapping manner of CCE-REG can be determined according to a higher layer parameter. When the resource mapping mode is interleaving mapping, carrying out REG grouping on the balanced PDCCH resource blocks to obtain a plurality of REG bundles; determining the number of each REG beam according to the current aggregation level, and arranging the numbers of each REG beam in a sequence from small to large to obtain a PDCCH resource block index; and de-interleaving the balanced PDCCH resource blocks which do not contain demodulation reference signals according to the PDCCH resource block index to obtain PDCCH resource blocks after sequential recovery.
Specifically, the interleaver f may also be calculated by parameters such as the number of PDCCH resource blocks and cell IDs, and the REGs may be grouped into REG bundles, and the number of the REG Bundle corresponding to the PDCCH resource block may be determined according to the aggregation level (the aggregation level is the current aggregation level obtained based on the previous aggregation level sequence), and the number of the REG Bundle may be defined as pdcch_idex after being arranged in the order from small to large. And finally, extracting the equalized data which does not contain the DMRS according to the PDCCH_idex, and realizing REG Bundle de-interleaving to obtain the PDCCH resource block after the sequence recovery.
When the resource mapping mode is non-interleaving mapping, the required PDCCH resource blocks can be obtained only by sequentially extracting the equalized data which does not contain the DMRS.
As shown in fig. 6, CCE-REG grouping is performed on the PDCCH resource block obtained in fig. 5, the type of the search space and each aggregation level existing in the search space are obtained according to the higher layer parameters, the number of candidate sets under each aggregation level is calculated at the same time, and the type of the search space, each aggregation level and the number of candidate sets under each aggregation level are input into a CCE initial position calculation formula to obtain the initial position of the CCE of each aggregation level.
As shown in fig. 7, the candidate PDCCH resource block under the current aggregation level is determined according to the time-frequency resource grid diagram of the target signal. For example, when the current aggregation level al=4 and the initial CCE position is 0 in the aggregation level, the 0 th CCE, the 1 st CCE, the 2 nd CCE and the 3 rd CCE in the PDCCH resource block are combined to form the candidate PDCCH resource block for blind detection.
The blind detection steps of the candidate PDCCH resource blocks are as follows:
sequentially demodulating, descrambling, rate-matching, polar code decoding, RNTI descrambling and CRC checking the candidate PDCCH resource blocks;
if the CRC result is correct, the DCI information obtained through the candidate PDCCH resource block is the required DCI information, and the blind detection is ended; and if the CRC check result is incorrect, determining the next aggregation level for blind detection according to the aggregation level sequence, and carrying out blind detection on the next candidate PDCCH resource block corresponding to the next aggregation level until the required DCI information is obtained, and ending the blind detection.
The method belongs to the same technical concept as the method for detecting PDCCH blindness in the 5G communication system in the foregoing embodiment, and the embodiment of the application also provides a device for detecting PDCCH blindness in the 5G communication system, which is used for implementing the method for detecting PDCCH blindness in the 5G communication system in the foregoing embodiment.
Fig. 8 is a schematic structural diagram of a PDCCH blind detection apparatus in a 5G communication system according to an embodiment of the present application, and as shown in fig. 8, a PDCCH blind detection apparatus 800 in a 5G communication system includes: a target signal acquisition unit 810, a CCE initial position calculation unit 820, an aggregation level ordering unit 830, and a blind detection unit 840;
a target signal obtaining unit 810, configured to receive a target signal sent by a network side device through a PDCCH;
a CCE initial position calculation unit 820, configured to process the target signal to obtain CCE initial positions under each aggregation level existing in a search space to be blindly detected;
an aggregation level ordering unit 830, configured to obtain a time-frequency resource grid diagram of the target signal, and order each aggregation level existing in a search space to be blindly detected according to the time-frequency resource grid diagram, so as to obtain an aggregation level order for blind detection;
and a blind detection unit 840, configured to determine a candidate PDCCH resource block according to the aggregation level order and the CCE initial position for blind detection.
In one embodiment of the present application, the aggregation level ordering unit 830 is configured to calculate energy of the target signal at each frequency point on the frequency domain; and drawing an energy map at a time-frequency domain position corresponding to the PDCCH according to the energy of the target signal at each frequency point, wherein the energy map is the time-frequency resource grid map.
In one embodiment of the present application, the aggregation level ordering unit 830 is configured to determine the number of PDCCH resource blocks in the time-frequency resource grid diagram and in different energy ranges; and sequencing the aggregation levels according to the PDCCH resource block quantity in different energy ranges.
In one embodiment of the present application, the blind detection unit 840 is configured to determine a current aggregation level for blind detection according to the aggregation level order; and determining the PDCCH resource block candidates according to the current aggregation level and the CCE initial position under the current aggregation level, and performing blind detection on the PDCCH resource block candidates.
In one embodiment of the present application, the blind detection unit 840 is further configured to sequentially demodulate, descramble, rate-de-match, polar code decode, RNTI descramble, and CRC check the PDCCH candidate resource blocks; if the CRC result is correct, the DCI information obtained through the candidate PDCCH resource block is the required DCI information, and the blind detection is ended; and if the CRC check result is incorrect, determining the next aggregation level for blind detection according to the aggregation level sequence, and carrying out blind detection on the next candidate PDCCH resource block corresponding to the next aggregation level until the required DCI information is obtained.
In one embodiment of the present application, a CCE initial position calculation unit 820 is configured to obtain a digital baseband signal of the target signal; synchronizing the downlink signals of the digital baseband signals to obtain a main information block, and analyzing the main information block to obtain the position of a PDCCH resource block of the target signal; acquiring a demodulation reference signal carried on the PDCCH in the target signal, and carrying out channel estimation and equalization according to the demodulation reference signal carried on the PDCCH and the locally generated demodulation reference signal to obtain an equalized PDCCH resource block; determining a resource mapping mode from CCE to REG according to the high-level parameters, demapping the balanced PDCCH resource blocks according to the determined resource mapping mode, and recovering the sequence of the PDCCH resource blocks to be the sequence before mapping; and obtaining the initial position of the CCE under each aggregation level in the search space according to the type of the search space, the aggregation level in the search space and the PDCCH resource block after sequential recovery.
In one embodiment of the present application, when the resource mapping manner is interleaving mapping, a CCE initial position calculation unit 820 is configured to perform REG grouping on the equalized PDCCH resource blocks to obtain a plurality of REG bundles; determining the number of each REG beam according to the current aggregation level, and arranging the numbers of each REG beam in a sequence from small to large to obtain a PDCCH resource block index; and de-interleaving the balanced PDCCH resource blocks which do not contain demodulation reference signals according to the PDCCH resource block index to obtain PDCCH resource blocks after sequential recovery.
It can be understood that the PDCCH blind detection apparatus in a 5G communication system can implement each step of the PDCCH blind detection method in a 5G communication system provided in the foregoing embodiment, and the explanation about the PDCCH blind detection method in a 5G communication system is applicable to the PDCCH blind detection apparatus in a 5G communication system, which is not repeated herein.
Fig. 9 shows a schematic diagram of an electronic device according to an embodiment of the application. Referring to fig. 9, at the hardware level, the electronic device includes a processor and a memory, and optionally an internal bus, a network interface. The Memory may include a Memory, such as a Random-Access Memory (RAM), and may further include a non-volatile Memory (non-volatile Memory), such as at least 1 disk Memory. Of course, the electronic device may also include hardware required for other services.
The processor, interface module, communication module, and memory may be interconnected by an internal bus, which may be an ISA (Industry Standard Architecture ) bus, a PCI (Peripheral Component Interconnect, peripheral component interconnect standard) bus, or an EISA (Extended Industry Standard Architecture ) bus, among others. The buses may be divided into address buses, data buses, control buses, etc. For ease of illustration, only one bi-directional arrow is shown in fig. 9, but not only one bus or one type of bus.
And a memory for storing computer executable instructions. The memory provides computer-executable instructions to the processor via the internal bus.
A processor executing computer executable instructions stored in the memory and specifically configured to perform the following operations:
receiving a target signal sent by network side equipment through PDCCH;
processing the target signal to obtain initial CCE positions under all aggregation levels existing in a search space to be blindly detected;
acquiring a time-frequency resource grid diagram of the target signal, and sequencing all aggregation levels existing in a search space to be blindly detected according to the time-frequency resource grid diagram to obtain an aggregation level sequence for blind detection;
and determining a candidate PDCCH resource block according to the aggregation level sequence and the CCE initial position to carry out blind detection.
The functions performed by the PDCCH blind detection method in the 5G communication system disclosed in the embodiment shown in fig. 1 of the present application may be applied to a processor or implemented by a processor. The processor may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or by instructions in the form of software.
The present application also proposes a computer-readable storage medium storing one or more programs that, when executed by a processor, implement the following operations:
receiving a target signal sent by network side equipment through PDCCH;
processing the target signal to obtain initial CCE positions under all aggregation levels existing in a search space to be blindly detected;
acquiring a time-frequency resource grid diagram of the target signal, and sequencing all aggregation levels existing in a search space to be blindly detected according to the time-frequency resource grid diagram to obtain an aggregation level sequence for blind detection;
and determining a candidate PDCCH resource block according to the aggregation level sequence and the CCE initial position to carry out blind detection.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) containing computer-usable program code.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of computer-readable media.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus 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 apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the invention.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.
Claims (8)
1. A method for PDCCH blind detection in a 5G communication system, the method comprising:
receiving a target signal sent by network side equipment through PDCCH;
processing the target signal to obtain initial CCE positions under all aggregation levels existing in a search space to be blindly detected;
acquiring a time-frequency resource grid diagram of the target signal, and sequencing all aggregation levels existing in a search space to be blindly detected according to the time-frequency resource grid diagram to obtain an aggregation level sequence for blind detection;
determining a candidate PDCCH resource block according to the aggregation level sequence and the CCE initial position for blind detection;
obtaining the time-frequency resource grid graph of the target signal comprises the following steps:
calculating the energy of the target signal at each frequency point on the frequency domain;
drawing an energy map at a time-frequency domain position corresponding to the PDCCH according to the energy of the target signal at each frequency point, wherein the energy map is the time-frequency resource grid map;
the time-frequency resource grid diagram comprises the energy distribution condition of the target signal in the PDCCH time-frequency range, and PDCCH resource blocks under the same aggregation level are positioned in the same energy region on the time-frequency resource grid diagram; sequencing all aggregation levels existing in a search space to be blindly detected according to the time-frequency resource grid diagram to obtain an aggregation level sequence for blind detection, wherein the sequencing comprises the following steps:
determining the quantity of PDCCH resource blocks in different energy ranges in the time-frequency resource grid diagram;
and sequencing the aggregation levels according to the PDCCH resource block quantity in different energy ranges.
2. The method of claim 1, wherein determining PDCCH resource block candidates for blind detection based on the aggregation level order and the CCE initial location comprises:
determining a current aggregation level for blind detection according to the aggregation level sequence;
and determining the PDCCH resource block candidates according to the current aggregation level and the CCE initial position under the current aggregation level, and performing blind detection on the PDCCH resource block candidates.
3. The method of claim 2, wherein blindly detecting the PDCCH candidate resource blocks comprises:
sequentially demodulating, descrambling, rate-matching, polar code decoding, RNTI descrambling and CRC checking the candidate PDCCH resource blocks;
if the CRC result is correct, the DCI information obtained through the candidate PDCCH resource block is the required DCI information, and the blind detection is ended; and if the CRC check result is incorrect, determining the next aggregation level for blind detection according to the aggregation level sequence, and carrying out blind detection on the next candidate PDCCH resource block corresponding to the next aggregation level until the required DCI information is obtained.
4. The method of claim 1, wherein processing the target signal to obtain initial CCE locations at respective aggregation levels present within a search space to be blindly detected comprises:
acquiring a digital baseband signal of the target signal;
synchronizing the downlink signals of the digital baseband signals to obtain a main information block, and analyzing the main information block to obtain the position of a PDCCH resource block of the target signal;
acquiring a demodulation reference signal carried on the PDCCH in the target signal, and carrying out channel estimation and equalization according to the demodulation reference signal carried on the PDCCH and the locally generated demodulation reference signal to obtain an equalized PDCCH resource block;
determining a resource mapping mode from CCE to REG according to the high-level parameters, demapping the balanced PDCCH resource blocks according to the determined resource mapping mode, and recovering the sequence of the PDCCH resource blocks to be the sequence before mapping;
and obtaining the initial position of the CCE under each aggregation level in the search space according to the type of the search space, the aggregation level in the search space and the PDCCH resource block after sequential recovery.
5. The method of claim 4, wherein when the resource mapping manner is interleaving mapping, de-mapping the equalized PDCCH resource blocks according to the determined resource mapping manner, and recovering the order of the PDCCH resource blocks to the order before mapping, comprises:
performing REG grouping on the balanced PDCCH resource blocks to obtain a plurality of REG bundles;
determining the number of each REG beam according to the current aggregation level, and arranging the numbers of each REG beam in a sequence from small to large to obtain a PDCCH resource block index;
and de-interleaving the balanced PDCCH resource blocks which do not contain demodulation reference signals according to the PDCCH resource block index to obtain PDCCH resource blocks after sequential recovery.
6. A PDCCH blind detection apparatus in a 5G communication system, the apparatus comprising:
a target signal acquisition unit, configured to receive a target signal sent by a network side device through a PDCCH;
the CCE initial position calculation unit is used for processing the target signal to obtain CCE initial positions under all aggregation levels existing in the search space to be blindly detected;
the aggregation level ordering unit is used for acquiring a time-frequency resource grid diagram of the target signal, and ordering all aggregation levels existing in a search space to be blindly detected according to the time-frequency resource grid diagram to obtain an aggregation level sequence for blind detection; the aggregation level ordering unit is specifically used for calculating the energy of each frequency point of the target signal on the frequency domain; drawing an energy map at a time-frequency domain position corresponding to the PDCCH according to the energy of the target signal at each frequency point, wherein the energy map is the time-frequency resource grid map;
the blind detection unit is used for determining a candidate PDCCH resource block according to the aggregation level sequence and the CCE initial position to carry out blind detection;
the time-frequency resource grid diagram comprises the energy distribution condition of the target signal in the PDCCH time-frequency range, and PDCCH resource blocks under the same aggregation level are positioned in the same energy region on the time-frequency resource grid diagram; the aggregation level ordering unit is used for determining the quantity of PDCCH resource blocks in different energy ranges in the time-frequency resource grid diagram; and sequencing the aggregation levels according to the PDCCH resource block quantity in different energy ranges.
7. An electronic device, comprising:
a processor; and
a memory arranged to store computer executable instructions which, when executed, cause the processor to perform the method of any of claims 1-5.
8. A computer readable storage medium storing one or more programs, which when executed by a processor, implement the method of any of claims 1-5.
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