CN112804042A - Method for detecting PDCCH in NR system - Google Patents

Method for detecting PDCCH in NR system Download PDF

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CN112804042A
CN112804042A CN202110293528.2A CN202110293528A CN112804042A CN 112804042 A CN112804042 A CN 112804042A CN 202110293528 A CN202110293528 A CN 202110293528A CN 112804042 A CN112804042 A CN 112804042A
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rnti
pdcch
dmrs
search space
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CN112804042B (en
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郑高斌
戴长江
章永灿
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Wuhan Hengda Anwang Information Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0061—Error detection codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

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Abstract

The invention relates to a method for detecting PDCCH in an NR system, which comprises the following steps: collecting search space configuration information of a base station; de-interleaving according to the collected search space configuration information; selecting an aggregation level, and determining the position of a PDCCH candidate set in a search space according to the aggregation level; determining a descrambling parameter N from PDCCH DMRSID(ii) a Establishing a Radio Network Temporary Identifier (RNTI) candidate set, wherein the RNTI candidate set comprises candidate values of all RNTIs with corresponding priority sequences; RNTIs with the highest priority are sequentially selected from the RNTI candidate set according to the NIDPerforming data descrambling, rate de-matching and Polar decoding with the RNTI, and then performing CRC (cyclic redundancy check) to determine the corresponding RNTI and DCI when the check is correct; the method can detect the small cell under the condition that parameters configured by a high layer aiming at specific UE and RNTI corresponding to all UE in the cell are unknownDCI information of all users within a zone coverage.

Description

Method for detecting PDCCH in NR system
Technical Field
The invention relates to the technical field of wireless communication, in particular to a method for detecting a PDCCH in an NR system.
Background
A New Radio (New air interface) system uses a Physical Downlink Control Channel (PDCCH) to transmit Downlink Control Information (DCI), which includes resource allocation Information for scheduling uplink and Downlink transmission, a transport block size, a modulation level, an antenna port, and the like.
In order to avoid persistent interference generated between cells of a PDCCH similar to LTE (Long Term Evolution), the resource configuration of the NR PDCCH is more flexible. The maximum system bandwidth of the NR in the frequency band below 6GHz is 100MHz, the maximum system bandwidth of the frequency band above 6GHz can reach 400MHz, and the PDCCH does not need to occupy the entire system bandwidth to avoid wasting frequency resources, so the NR establishes a frequency region by a Control Resource Set (CORESET), and the number of Physical Resource Blocks (PRBs) occupied by the CORESET, the positions of the PRBs, and the duration of the PRBs can be flexibly configured on the network side.
Due to limitations in terminal capabilities or for power saving considerations, a UE (User Equipment) in an NR system may operate in BWP (Bandwidth Part, a portion of the system Bandwidth). After the UE accesses the network through the initial access procedure, the network side may configure its working BWP for the UE through dedicated signaling, each UE may configure 4 BWPs at most, but only one BWP will be activated, the UE only transmits data on the BWP, and the network side configures the CORESET frequency resource with reference to the BWP configuration.
Depending on the number of DCI bits to be carried and the channel condition, the base station may use 1, 2, 4, 8, and 16 consecutive CCEs (control channel elements) to carry one DCI, and the number of CCEs carrying one DCI is referred to as an aggregation level. The UE needs to detect DCI according to a specific DCI format and RNTI (radio network temporary identifier) on different PDCCH candidates. When detecting DCI, the UE does not know whether the base station transmits DCI or not, and does not know the CCE aggregation level and the starting position used to actually transmit the DCI, and the UE needs to try the candidate PDCCHs one by one, and the process of this try is the blind detection of the candidate PDCCHs.
The Search Space is composed of a set of candidate PDCCHs that the UE needs to blind-detect, and is divided into CSS (Common Search Space) and USS (User-Specific Search Space). Common control information for a group of UEs is transmitted through the CSS. The USS corresponds to a specific UE, and dedicated scheduling information of the UE may be transmitted through the USS or may be transmitted through the CSS.
The PDCCH is added with CRC (Cyclic Redundancy Check), Polar coding, rate matching, scrambling, interleaving at the transmitting end, and under a normal condition, the UE needs to perform blind detection in the PDCCH candidate set according to related parameters configured at a high layer and its RNTI, so as to find out the DCI belonging to itself. However, if all PDCCHs in the search space are to be analyzed under the condition that the RNTI and the high-layer parameters are unknown, the common blind search scheme for UE is no longer applicable.
Disclosure of Invention
The invention provides a method for detecting a PDCCH in an NR system aiming at the technical problems in the prior art, and solves the problem that the common UE poor search blind detection scheme is not applicable under the condition of unknown RNTI and high-level parameters in the prior art.
The technical scheme for solving the technical problems is as follows: a method for detecting PDCCH in a NR system, comprising:
step 1, collecting search space configuration information of a base station;
step 2, performing de-interleaving according to the collected search space configuration information;
step 3, selecting an aggregation level, and determining the position of the PDCCH candidate set in a search space according to the aggregation level;
step 4, determining descrambling parameter N according to PDCCH DMRSID；
Step 5, establishing a Radio Network Temporary Identifier (RNTI) candidate set, wherein the RNTI candidate set comprises candidate values of all RNTIs with corresponding priority sequences;
step 6, RNTIs with the highest priority are sequentially selected from the RNTI candidate set, and the RNTIs are selected according to the NIDPerforming data descrambling, rate de-matching and CRC (cyclic redundancy check) after Polar decoding with RNTI (radio network temporary identifier), and determining whether the check is correctCorresponding RNTI and DCI.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, in step 1, for the public search space, after a cell search process is performed, MIB information is obtained;
for the dedicated search space, the set of CORESET resources configured by the cell through RRC signaling is collected.
Further, in the step 2, for mapping of CCEs to REGs, the mapping includes a localized mapping and a distributed mapping;
for the centralized interleaving mapping, the centralized interleaving mapping function is: (x) = x, corresponding symbols are taken out according to the sequence of time domain first and frequency domain second when de-interleaving is carried out;
for distributed mapping, the distributed mapping interleaver mapping function is:
Figure 765375DEST_PATH_IMAGE001
Figure 357024DEST_PATH_IMAGE002
Figure 536071DEST_PATH_IMAGE003
Figure 651794DEST_PATH_IMAGE004
Figure 101361DEST_PATH_IMAGE005
wherein x is the REG group number, C is the number of columns of the interleaver,
Figure 378759DEST_PATH_IMAGE006
an offset value, or PCID, configured for higher layer parameters, R is the number of interleaver rows,
Figure 140041DEST_PATH_IMAGE007
the number of REGs contained in one CORESET;
and constructing a matrix of R rows and C columns according to the REG numbers during de-interleaving, and obtaining the REG group numbers corresponding to the CCEs after interleaving according to the row listing principle.
Further, in the step 3, for the common search space, selecting an aggregation level AL of 4, 8, or 16 for blind detection;
for the dedicated search space, blind detection is performed with an aggregation level AL of 1, 2, 4, 8, or 16.
Further, in step 3, for candidate PDCCHs with an aggregation level AL, the starting CCE thereof is numbered n × AL, n =0,1, …, floor (Ncce/AL).
Further, the step 4 comprises:
step 401, separating PDCCH DMRS REs in the PDCCH candidate positions in sequence;
step 402, determine NIDAccording to each N within the value rangeIDLocally generating a corresponding number of DMRS sequences;
step 403, sequentially performing channel estimation on the local DMRS sequence and the received DMRS information, estimating the SNR of each possible DMRS sequence, and finding out N corresponding to the DMRS sequence with the maximum SNRIDEstimated N with value of current PDCCH candidateIDThe value is obtained.
Further, in the process of separating out the RE where PDCCH DMRS is located in step 401, the formula of PDCCH DMRS mapping is as follows:
Figure 105461DEST_PATH_IMAGE008
the candidate PDCCHs are mapped to REs No. 1,5 and 9 of each RB, the initial position of the candidate PDCCH is n × AL, n =0,1, … and floor (Ncce/AL), and the RE number of the DMRS is (n + k) × 6 × 12+ m, k =0,1 … AL-1 and m =1,5 and 9.
Further, the step 403 obtains the estimated N of the current PDCCH candidateIDThe values are also as follows:
step 404, predict NIDPerforming correlation operation on the DMRS sequence generated by the value and the whole PDCCH candidate set, and judging whether the position of a correlation peak value is RE where the DMRS is located, if so, indicating that the current PDCCH candidate is effective, and if not, judging whether the current PDCCH candidate is effectiveEntering a detection process of a next PDCCH candidate;
obtaining the preliminarily screened NIDAnd then, PDCCH DMRS is used for carrying out least square estimation to obtain a descrambled channel, the PDCCH data is equalized according to the descrambled channel, and then the PDCCH is subjected to QPSK soft demodulation.
Further, the step 5 comprises:
initializing the RNTI candidate set to be {1, 2, …, 65519}, wherein the priority order is from high to low;
and after any RNTI is decoded successfully, setting the corresponding priority as the highest level.
Further, in the step 6, the step of,
according to said NIDThe process of data descrambling with the RNTI comprises the following steps:
locally based on the RNTI and NIDGenerating a pseudo-random sequence for descrambling, and descrambling the soft demodulated data; the descrambling mode is as follows: if the corresponding pseudo random sequence bit is 1, the data is inverted, and if the corresponding pseudo random sequence bit is 0, the data is unchanged;
the process of performing de-rate matching includes:
for the special search space, the uplink adopts DCI format of DCI0_0/DCI0_1, the downlink adopts DCI1_0/DCI1_1, several possible DCI lengths are estimated according to the DCI format, the length N before rate matching is obtained according to the original length and the length E after rate matching, if the length E is greater than the length N, the length E is cut off, and if the length E is not greater than the length N, 0 filling is supplemented at the tail part;
the process of carrying out Polar decoding and CRC check comprises the following steps:
polar decoding is carried out on the data after rate de-matching, and the decoding result is DCI Payload and CRC with 24 bits; performing exclusive or on the last 16 bits of the CRC and the value of the RNTI to obtain a CRC value after descrambling; and traversing the RNTI candidate set and checking the Polar decoding result by using the descrambled CRC value until the correct RNTI is found out so that the Polar decoding CRC check is correct.
The scheme provided by the invention has the beneficial effects that: the invention provides a method for blind detection of PDCCH in an NR system aiming at the requirement of analyzing all PDCCHs in a search space, which can detect the DCI information of all users in a cell coverage area under the condition of unknown parameters configured by a high layer aiming at specific UE and RNTIs corresponding to all UEs in the cell.
Drawings
Fig. 1 is a flowchart of a method for detecting a PDCCH in an NR system according to an embodiment of the present invention;
FIG. 2 is a push-to-push-out N according to PDCCH DMRS according to an embodiment of the present inventionIDA flow chart of (1);
fig. 3 is a flowchart for determining an RNTI and DCI information thereof according to an embodiment of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
The CSS is classified into Type0/0A/1/2/3-PDCCH CSS according to transmission contents and configuration methods, and is respectively used for scheduling or transmission of RMSI, OSI, RAR/Msg4, Paging, and group common control information, and table 1 below is an NR search space subdivision table
Table 1: NR search space subdivision table
Figure 596485DEST_PATH_IMAGE009
The PDCCH is subjected to processes of CRC attachment, Polar coding, rate matching, scrambling, interleaving, modulation, layer mapping and the like at a transmitting end, and the DCI can be analyzed at a receiving end through a reverse process. The CRC is scrambled by RNTI, and the data after rate matching is according to the RNTI and the descrambling parameter NIDAnd (4) scrambling.
N when the high layer is not configured with the pdcch-DMRS-ScambringID parameterIDNID is the value of a pdcch-DMRS-scrimblingid parameter when the parameter is configured for a PCID (physical cell identifier). Meanwhile, parameters used in the interleaving process are also configured by a high layer.
PDCCH channel estimation needs to be based on PDCCH DMRS (Demodulation Reference Signal), PDCCH DMRS generates with GOLD sequence:
Figure 982467DEST_PATH_IMAGE010
。
wherein,
Figure 575254DEST_PATH_IMAGE011
in order to generate the sequence of the sequence,
Figure 829518DEST_PATH_IMAGE012
as a pseudo-random sequence
Figure 689895DEST_PATH_IMAGE013
And j is an imaginary symbol.
Pseudo-random sequence
Figure 574674DEST_PATH_IMAGE013
The initialization parameters of (1) are:
Figure 654757DEST_PATH_IMAGE014
。
wherein,
Figure 650395DEST_PATH_IMAGE015
is an index value for an OFDM symbol within a slot,
Figure 896437DEST_PATH_IMAGE016
is the number of time slots within a frame,
Figure 952118DEST_PATH_IMAGE017
the number of symbols in the slot.
In general, the UE needs to perform blind detection in the PDCCH candidate set according to the relevant parameters configured by the higher layer and its RNTI, so as to find out the DCI belonging to the UE. However, if all PDCCHs in the search space are to be analyzed under the condition that the RNTI and the high-layer parameters are unknown, a common UE blind search scheme is not applicable.
The method for detecting the PDCCH in the NR system is suitable for blind detection of all PDCCHs in a cell when signal to noise ratio is good under the condition that the configuration parameters and the unknown RNTI of UE in an unknown NR cell are in a scene. As shown in fig. 1, which is a flowchart of a method for detecting a PDCCH in an NR system according to an embodiment of the present invention, as shown in fig. 1, the method includes:
step 1, collecting the search space configuration information of the base station.
And 2, performing deinterleaving according to the collected search space configuration information.
And 3, selecting the aggregation level, and determining the position of the PDCCH candidate set in the search space according to the aggregation level.
Step 4, determining descrambling parameter N according to PDCCH DMRSID。
And step 5, establishing a Radio Network Temporary Identifier (RNTI) candidate set, wherein the RNTI candidate set comprises candidate values of all RNTIs with corresponding priority sequences.
Step 6, RNTIs with the highest priority are sequentially selected from the RNTI candidate set according to NIDAnd performing data descrambling, rate de-matching and Polar decoding with the RNTI, and then performing CRC (cyclic redundancy check) check to determine the corresponding RNTI and DCI when the check is correct.
The invention provides a method for blind detection of PDCCH in an NR system aiming at the requirement of analyzing all PDCCHs in a search space, which can detect the DCI information of all users in a cell coverage area under the condition of unknown parameters configured by a high layer aiming at specific UE and RNTIs corresponding to all UEs in the cell.
Example 1
Embodiment 1 provided in the present invention is an embodiment of a method for detecting a PDCCH in an NR system provided in the present invention, and as can be seen from fig. 1, the embodiment includes:
step 1, collecting the search space configuration information of the base station.
Specifically, for the public search space, after a cell search process is performed, MIB (Master Information Block) Information is acquired; the method comprises the steps that MIB- > PDCCH-ConfigSIB determines CORESET configuration used for a Type0-PDCCH common search space, and time-frequency resources occupied by CORESET of the Type0-PDCCH common search space are included.
For the dedicated search space, the set of CORESET resources configured by the cell through RRC signaling is collected.
And 2, performing deinterleaving according to the collected search space configuration information.
Preferably, for mapping CCE to REG, the NR protocol supports two manners, namely localized mapping and distributed mapping, which correspond to two different interleaving mapping functions. The interleaving parameters of the public search space are fixed, the UE-dedicated search space needs to judge whether the interleaving mode is centralized mapping or distributed mapping, the centralized mapping does not need processing, and the distributed mapping needs to perform de-interleaving of the REG group according to the size of the search space, the size of the REG group, the number of rows of an interleaver and an offset value.
Localized mapping refers to mapping of CCEs to consecutive REGs. For the centralized interleaving mapping, the centralized interleaving mapping function is: and f (x) = x, and corresponding symbols are taken out according to the sequence of time domain first and frequency domain second during de-interleaving.
For distributed mapping, the distributed mapping interleaver mapping function is:
Figure 175289DEST_PATH_IMAGE018
Figure 725350DEST_PATH_IMAGE019
Figure 107790DEST_PATH_IMAGE020
Figure 318060DEST_PATH_IMAGE021
Figure 294107DEST_PATH_IMAGE022
wherein x is the REG group number, C is the number of columns of the interleaver,
Figure 897126DEST_PATH_IMAGE023
an offset value, or PCID, configured for higher layer parameters, R is the number of interleaver rows,
Figure 619226DEST_PATH_IMAGE024
the number of REGs contained in one CORESET, and L is the REG group size.
And constructing a matrix of R rows and C columns according to the REG numbers during de-interleaving, and obtaining the REG group numbers corresponding to the CCEs after interleaving according to the row listing principle.
And 3, selecting the aggregation level, and determining the position of the PDCCH candidate set in the search space according to the aggregation level.
Preferably, for the common search space, the aggregation level L is selected to be 4, 8 or 16 for blind detection.
For the dedicated search space, blind detection is performed with an aggregation level AL of 1, 2, 4, 8, or 16.
For candidate PDCCH with aggregation level AL, the initial CCE number is n × AL, n =0,1, …, Floor (Ncce/AL), where Floor is a rounded-down function and Ncce is the number of CCEs included in the search space.
Step 4, determining descrambling parameter N according to PDCCH DMRSID。
Preferably, as shown in FIG. 2, a push-to-push-out N according to PDCCH DMRS is provided according to an embodiment of the present inventionIDAs can be seen from fig. 2, step 4 includes:
in step 401, in the PDCCH candidate positions, REs (resource elements) where PDCCH DMRS and PDCCH Payload are located are separated in turn.
Specifically, in the process of separating out the RE where PDCCH DMRS is located, the PDCCH DMRS mapping formula is as follows:
Figure 16709DEST_PATH_IMAGE025
wherein,
Figure 214472DEST_PATH_IMAGE026
is a number of 12, and is,
Figure 604871DEST_PATH_IMAGE011
is the sequence to be mapped to the sequence,
Figure 509373DEST_PATH_IMAGE027
is the scaling factor that is used to scale the image,
Figure 77758DEST_PATH_IMAGE028
is the mapped RE.
The candidate PDCCHs are mapped to REs No. 1,5 and 9 of each RB, the initial position of the candidate PDCCH is n × AL, n =0,1, … and floor (Ncce/AL), and the RE number of the DMRS is (n + k) × 6 × 12+ m, k =0,1 … AL-1 and m =1,5 and 9.
Step 402, determine NIDAnd locally generating corresponding number of DMRS sequences according to the value of each NID in the value range.
Specifically, NIDThe value range of (1) is 0-65535, 65536 DMRS sequences are generated locally according to the value range of NID, and the DMRS sequences correspond to different NIDThe value is obtained.
Step 403, sequentially performing channel estimation on the local DMRS sequence and the received DMRS information, estimating SNR (SIGNAL to NOISE RATIO) of each possible DMRS sequence, and finding N corresponding to the DMRS sequence with the highest SNRIDEstimated N with value of current PDCCH candidateIDThe value is obtained.
Preferably, step 403 obtains an estimated N of the current PDCCH candidateIDAfter the value, the estimated N is also includedIDPerforming primary screening on the values, specifically comprising:
step 404, predict NIDAnd carrying out correlation operation on the DMRS sequence generated by the value and the whole PDCCH candidate set, judging whether the position of a correlation peak value is RE where the DMRS is located, if so, indicating that the current PDCCH candidate is effective, otherwise, entering the detection flow of the next PDCCH candidate.
Obtaining the preliminarily screened NIDAnd then, using PDCCH DMRS to perform least square estimation to obtain a descrambled channel, equalizing the PDCCH data according to the descrambled channel, and then performing QPSK (Quadrature Phase Shift Keying) soft demodulation on the PDCCH.
Whether the correlation peak position is exactly on the RE positions of No. 1, No. 5 and No. 9 of each RB, if not, the PDCCH candidate position is considered as not carrying real DCI, and if so, the blind detection process is continued.
N is required for descrambling dataIDAnd RNTI, NIDThe value of (3) is obtained in the step (4), and the value range of the RNTI is 0-65519.
And step 5, establishing a Radio Network Temporary Identifier (RNTI) candidate set, wherein the RNTI candidate set comprises candidate values of all RNTIs with corresponding priority sequences.
Preferably, step 5 comprises:
initializing the RNTI candidate set to be {1, 2, …, 65519}, wherein the priority order is from high to low; and after any RNTI is decoded successfully, setting the corresponding priority as the highest level.
And 6, sequentially selecting RNTIs with the highest priority in the RNTI candidate set, performing data descrambling, rate de-matching and Polar decoding according to the NID and the RNTI, and then performing CRC (cyclic redundancy check) to determine the corresponding RNTI and DCI when the verification is correct.
Preferably, as shown in fig. 3, which is a flowchart for determining RNTI and DCI information thereof according to an embodiment of the present invention, as can be seen from fig. 3, step 6 is performed according to NIDThe process of data descrambling with the RNTI comprises the following steps:
locally based on RNTI and NIDGenerating a pseudo-random sequence for descrambling, and descrambling the soft demodulated data; the descrambling mode is as follows: if the corresponding pseudo-random sequence bit is 1, the data is inverted, and if the corresponding pseudo-random sequence bit is 0, the data is unchanged. Here 65519 descrambled sequences will result.
The process of performing de-rate matching includes:
for the special search space, the uplink adopts DCI format DCI0_0/DCI0_1, the downlink adopts DCI1_0/DCI1_1, several possible DCI lengths can be estimated according to the DCI format, the length N before rate matching is obtained according to the original length and the length E after rate matching, if the length E is greater than the length N, the length E is truncated, and if the length E is not greater than the length N, 0 padding is supplemented at the tail.
The process of carrying out Polar decoding and CRC check comprises the following steps:
polar decoding is carried out on the data after rate de-matching, and the decoding result is DCI Payload and CRC with 24 bits; performing exclusive or on the last 16 bits of the CRC and the value of the RNTI to obtain a CRC value after descrambling; and traversing the RNTI candidate set and checking the Polar decoding result by using the descrambled CRC value, if the RNTI does not pass the CRC value, indicating that the currently tried RNTI is not the real RNTI, and needing to perform the next trial until the correct RNTI is found out to ensure that the Polar decoding CRC check is correct. And for correctly decoded RNTIs, the priority of the RNTIs in the RNTI searching set is increased.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (10)

1. A method for detecting PDCCH in an NR system, the method comprising:
step 1, collecting search space configuration information of a base station;
step 2, performing de-interleaving according to the collected search space configuration information;
step 3, selecting an aggregation level, and determining the position of the PDCCH candidate set in a search space according to the aggregation level;
step 4, determining descrambling parameter N according to PDCCH DMRSID；
Step 5, establishing a Radio Network Temporary Identifier (RNTI) candidate set, wherein the RNTI candidate set comprises candidate values of all RNTIs with corresponding priority sequences;
step 6, RNTIs with the highest priority are sequentially selected from the RNTI candidate set, and the RNTIs are selected according to the NIDAnd performing data descrambling, rate de-matching and Polar decoding with the RNTI, and then performing CRC (cyclic redundancy check) check to determine the corresponding RNTI and DCI when the check is correct.
2. The method according to claim 1, wherein in step 1, for the common search space, after a cell search procedure is performed, MIB information is obtained;
for the dedicated search space, the set of CORESET resources configured by the cell through RRC signaling is collected.
3. The method according to claim 1, wherein in step 2, for mapping of CCEs to REGs, the mapping comprises localized mapping and distributed mapping;
for the centralized interleaving mapping, the centralized interleaving mapping function is: (x) = x, corresponding symbols are taken out according to the sequence of time domain first and frequency domain second when de-interleaving is carried out;
for distributed mapping, the distributed mapping interleaver mapping function is:
Figure 388393DEST_PATH_IMAGE001
Figure 704843DEST_PATH_IMAGE002
Figure 80460DEST_PATH_IMAGE003
Figure 297815DEST_PATH_IMAGE004
Figure 708068DEST_PATH_IMAGE005
wherein x is the REG group number, C is the number of columns of the interleaver,
Figure 726577DEST_PATH_IMAGE006
an offset value, or PCID, configured for higher layer parameters, R is the number of interleaver rows,
Figure 323912DEST_PATH_IMAGE007
the number of REGs contained in a CORESET, L is the size of the REG group;
and constructing a matrix of R rows and C columns according to the REG numbers during de-interleaving, and obtaining the REG group numbers corresponding to the CCEs after interleaving according to the row listing principle.
4. The method according to claim 1, wherein in step 3, for the common search space, an aggregation level AL of 4, 8 or 16 is selected for blind detection;
for the dedicated search space, blind detection is performed with an aggregation level AL of 1, 2, 4, 8, or 16.
5. The method according to claim 1, wherein in step 3, for candidate PDCCHs with an aggregation level AL, the starting CCE is numbered n × AL, n =0,1, …, and a floor (Ncce/AL), wherein floor is a rounded-down function and Ncce is the number of CCEs included in the search space.
6. The method of claim 1, wherein the step 4 comprises:
step 401, separating PDCCH DMRS REs in the PDCCH candidate positions in sequence;
step 402, determine NIDAccording to each N within the value rangeIDLocally generating a corresponding number of DMRS sequences;
step 403, sequentially performing channel estimation on the local DMRS sequence and the received DMRS information, estimating the SNR of each possible DMRS sequence, and finding the estimated N with the NID value corresponding to the DMRS sequence with the largest SNR as the current PDCCH candidateIDThe value is obtained.
7. The method of claim 6, wherein in the step 401 of separating PDCCH DMRS-located REs, PDCCH DMRS maps the formula:
Figure 344957DEST_PATH_IMAGE008
wherein,
Figure 78558DEST_PATH_IMAGE009
is a number of 12, and is,
Figure 769434DEST_PATH_IMAGE010
is the sequence to be mapped to the sequence,
Figure 978698DEST_PATH_IMAGE011
is the scaling factor that is used to scale the image,
Figure 177336DEST_PATH_IMAGE012
is the mapped RE;
the candidate PDCCHs are mapped to REs No. 1,5 and 9 of each RB, the initial position of the candidate PDCCH is n × AL, n =0,1, … and floor (Ncce/AL), and the RE number of the DMRS is (n + k) × 6 × 12+ m, k =0,1 … AL-1 and m =1,5 and 9.
8. The method of claim 1, wherein the step 403 obtains an estimated N of a current PDCCH candidateIDThe values are also as follows:
step 404, predict NIDPerforming correlation operation on the DMRS sequence generated by the value and the whole PDCCH candidate set, and judging whether the position of a correlation peak is an RE where the DMRS is located, if so, indicating that the current PDCCH candidate is effective, otherwise, entering the detection flow of the next PDCCH candidate;
obtaining the preliminarily screened NIDAnd then, PDCCH DMRS is used for carrying out least square estimation to obtain a descrambled channel, the PDCCH data is equalized according to the descrambled channel, and then the PDCCH is subjected to QPSK soft demodulation.
9. The method of claim 1, wherein the step 5 comprises:
initializing the RNTI candidate set to be {1, 2, …, 65519}, wherein the priority order is from high to low;
and after any RNTI is decoded successfully, setting the corresponding priority as the highest level.
10. The method according to claim 1, wherein, in the step 6,
according to said NIDThe process of data descrambling with the RNTI comprises the following steps:
locally based on the RNTI and NIDGenerating a pseudo-random sequence for descrambling, and descrambling the soft demodulated data; the descrambling mode is as follows: if the corresponding pseudo random sequence bit is 1, the data is inverted, and if the corresponding pseudo random sequence bit is 0, the data is unchanged;
the process of performing de-rate matching includes:
for the special search space, the uplink adopts DCI format of DCI0_0/DCI0_1, the downlink adopts DCI1_0/DCI1_1, several possible DCI lengths are estimated according to the DCI format, the length N before rate matching is obtained according to the original length and the length E after rate matching, if the length E is greater than the length N, the length E is cut off, and if the length E is not greater than the length N, 0 filling is supplemented at the tail part;
the process of carrying out Polar decoding and CRC check comprises the following steps:
polar decoding is carried out on the data after rate de-matching, and the decoding result is DCI Payload and CRC with 24 bits; performing exclusive or on the last 16 bits of the CRC and the value of the RNTI to obtain a CRC value after descrambling; and traversing the RNTI candidate set and checking the Polar decoding result by using the descrambled CRC value until the correct RNTI is found out so that the Polar decoding CRC check is correct.
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