CN108418657B - Method for judging DCI format and transmission mode in LTE system - Google Patents

Method for judging DCI format and transmission mode in LTE system Download PDF

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CN108418657B
CN108418657B CN201810120599.0A CN201810120599A CN108418657B CN 108418657 B CN108418657 B CN 108418657B CN 201810120599 A CN201810120599 A CN 201810120599A CN 108418657 B CN108418657 B CN 108418657B
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刘武当
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Guangzhou Huiruisitong Technology Co Ltd
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    • 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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0036—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
    • H04L1/0038—Blind format detection
    • 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
    • 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

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Abstract

The invention discloses a method for judging DCI format and transmission mode in an LTE system, which comprises the following steps: presetting DCI length N required to be subjected to blind detection; blind detecting a PDCCH with DCI length of N in an LTE wireless network; after the PDCCH with the DCI length N is detected, processing and comparing and judging signals of the PDSCH part according to various DCI formats corresponding to the DCI length N, and accordingly judging the DCI formats and the transmission modes. The method can rapidly judge the DCI format with consistent total length and similar meaning of each field in the LTE system, and has the advantages of small operand, low complexity and good judgment effect.

Description

Method for judging DCI format and transmission mode in LTE system
Technical Field
The present invention relates to the field of mobile communications, and in particular, to a method for determining DCI format and transmission mode in an LTE system.
Background
In an LTE (Long Term Evolution) system, a UE (user equipment) must first detect a PDCCH (physical downlink control channel) that the UE desires in order to resolve a PDSCH (physical downlink shared channel). If the LTE downlink receiver of the UE can efficiently and blindly detect the PDCCH, the efficiency of receiving the base station data by the UE can be improved. Therefore, blind detection of PDCCH is a key step in LTE receiver and is also a hot technique of research in the industry.
In general, when detecting PDCCH, UE may perform according to its own RRC (radio resource control) state or TM (transmission mode), for example: in a cell search phase, the UE needs to detect a PDCCH scrambled by a SI-RNTI (system message radio network temporary identity); in the RRC connected state, the UE needs to detect the PDCCH scrambled by the C-RNTI (cell radio network temporary identifier) and the SPS-RNTI (semi-persistent scheduling radio network temporary identifier) according to a downlink transmission mode.
In the RRC connected state, the UE negotiates the TM with the base station according to the 3GPP TS (3 rd Generation partnership project technical Specification) 36.213 protocol. Therefore, the UE can detect the corresponding DCI format according to the TM where the UE is located, and complexity of a transmitting end and a receiving end is simplified. Under various TM, the DCI formats that the UE needs to blindly detect are different, for example, under TM2, DCI 1A and DCI 1 need to blindly detect, under TM3, DCI 1A and DCI 2A, TM8, DCI 1A and DCI2B need to blindly detect, and the like.
Since the UE and the base station negotiate the TM corresponding to the UE, there are only two DCI formats for blind detection by the UE to solve the PDSCH. However, in some special scenarios, the PDCCH blind detection module of the third-party LTE downlink receiver needs to detect the PDCCHs of all UEs in the current cell. For example, in patent with publication number CN 103701564B, a PDCCH blind detection method is provided in an unknown RNTI (radio network temporary identity) scenario, in which a downlink receiver of the third-party LTE is unknown about TM of each RNTI. In order to fully detect PDCCH in a cell, DCI lengths under all TM need to be added to a blind detection list.
According to the 3GPP TS36.212 protocol, the respective fields of DCI 2A in TM3 (transmission mode 3) and DCI2B in TM8 (transmission mode 8) are configured as shown in table 1. We have found that: in case of an LTE cell having 2 transmit antenna ports, the total length of DCI 2A and DCI2B is consistent. In an actual LTE system, DCI 2A and DCI2B are transmitted simultaneously in the same period of the same base station. When a third-party receiver blindly detects DCI of such length, because TM is unknown, the meanings of each field in DCI 2A and DCI2B are also very close, as shown in table 1, it cannot be determined which format is the DCI format actually used by the base station and the UE, that is, the third-party receiver faces the problem how to determine that DCI is DCI 2A or DCI 2B.
TABLE 1
Figure BDA0001571940570000021
Figure BDA0001571940570000031
In the above-mentioned table 1, the following,
Figure BDA0001571940570000032
indicates the corresponding RB number in the downlink bandwidth, and P is represented by
Figure BDA0001571940570000033
A parameter obtained by looking up the tableThe PUCCH indicates a physical uplink control channel, the TPC indicates transmission power control, the HARQ indicates hybrid automatic repeat request, and the information of the transport block 1 and the information of the transport block 2 include MCS (modulation and coding scheme), RV (redundancy version), and NDI (new data indicator).
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for judging a DCI format in an LTE system, which can quickly judge the DCI format with consistent total length and similar meanings of all fields in the LTE system and has the advantages of small operand, low complexity and good judgment effect.
A second object of the present invention is to provide a method for determining a transmission mode in an LTE system, which is implemented based on the above method.
The first purpose of the invention is realized by the following technical scheme: a method for judging DCI format in LTE system includes following steps:
step S1, presetting DCI length N needing blind detection;
step S2, detecting the PDCCH with the DCI length of N in the LTE wireless network in a blind mode;
step S3, after detecting the PDCCH having DCI length N, processes and compares the PDSCH partial signals according to the various DCI formats corresponding to DCI length N, thereby determining the DCI format.
Preferably, in step S3, the specific procedure for determining the DCI format by processing and comparing the PDSCH partial signal according to various DCI formats with DCI length N is as follows:
assuming that the DCI format to be determined is one of various DCI formats with the DCI length of N, then resolving a field of the DCI format to be determined according to the field of the DCI format, then calculating a channel estimation value sequence of the DCI format to be determined under the DCI format, calculating a normalized coherent accumulation value of the channel estimation value sequence, and finally determining whether the normalized coherent accumulation value of the channel estimation value sequence is greater than a preset threshold value, if so, taking the DCI format as a final determination result, and if not, excluding the DCI format as the DCI format to be determined.
Further, in step S1, it is preset that the DCI length N required to perform blind detection is 51bit, and the DCI format with the DCI length of 51bit is DCI 2A in the TM3 transmission mode and DCI2B in the TM8 transmission mode;
in step S3, according to various DCI formats with DCI length of 51bit, the signals of the PDSCH portion are processed and compared, so that the specific process of determining the DCI format is as follows:
firstly, the DCI format to be determined is assumed to be DCI2B with the DCI length of 51bit, each field of the DCI format to be determined is analyzed according to the field of the DCI2B, and a channel estimation sequence is obtained according to the channel estimation method of the UE specific reference signal on the antenna Port7 and the antenna Port8 corresponding to the DCI2B
Figure BDA0001571940570000041
Wherein i represents a subcarrier number, j represents an OFDM (orthogonal frequency division multiplexing) symbol number, s represents a transmission port number, and t represents a reception antenna number;
then calculating a channel estimation sequence
Figure BDA0001571940570000042
Normalized coherent accumulation value ρ:
Figure BDA0001571940570000043
finally, the channel estimation sequence is carried out
Figure BDA0001571940570000044
Comparing the normalized coherent accumulated value rho with a preset threshold value T; if rho is larger than T, taking the DCI2B as a final judgment result; otherwise, the DCI 2A is used as a final determination result.
Furthermore, the value range of the preset threshold value T is as follows: 0< T < 1.
Furthermore, the value of the preset threshold value T is 0.4.
Preferably, in step S3, the specific procedure of processing and comparing the PDSCH partial signal according to the various DCI formats with the preset DCI lengths is as follows:
for each DCI format with the DCI length of N, respectively assuming that the DCI format needing to be judged is the DCI format; under the assumption of each DCI format, demodulating to obtain a corresponding PDSCH modulation symbol after physical resource mapping, channel estimation, layer mapping and precoding and equalization processing, and then calculating an error vector amplitude average value of the modulation symbol; and finally, comparing the error vector amplitude average values of the modulation symbols calculated under the assumption of each DCI format, finding the minimum error vector amplitude average value of one modulation symbol, and taking the DCI format assumed when the error vector amplitude average value of the modulation symbol is correspondingly calculated as a final judgment result.
Further, in step S1, it is preset that the DCI length N required to perform blind detection is 51bit, and the DCI format with the DCI length of 51bit is DCI 2A in the TM3 transmission mode and DCI2B in the TM8 transmission mode;
in step S3, according to various DCI formats with DCI length of 51bit, the signals of the PDSCH portion are processed and compared, so that the specific process of determining the DCI format is as follows:
for DCI 2A and DCI2B with DCI length of 51 bit:
assuming that the DCI format to be determined is DCI 2A; under the assumption of DCI 2A, demodulating to obtain a corresponding PDSCH modulation symbol after physical resource mapping, channel estimation, layer mapping, precoding and equalization processing, and then calculating an error vector amplitude average value E of the modulation symbol2A；
Assuming that the DCI format to be determined is DCI 2B; under the assumption of DCI2B, demodulating to obtain corresponding PDSCH modulation symbols through physical resource mapping, channel estimation, layer mapping, precoding and equalization processing, and then calculating the error vector amplitude average value E of the modulation symbols2B；
Averaging the error vector magnitude of the modulation symbols calculated under the DCI 2A assumptionValue E2AAnd the error vector amplitude average value E of the modulation symbols calculated under the assumption of DCI2B2BMaking a comparison if E2A≤E2BAnd taking the DCI 2A as a final judgment result, otherwise, taking the DCI2B as a final judgment result.
Preferably, in step S3, the specific procedure of processing and comparing the PDSCH partial signal according to the various DCI formats with the preset DCI lengths is as follows:
for each DCI format with the DCI length of N, respectively assuming that the DCI format needing to be judged is the DCI format; under the assumption of each DCI format, descrambling, de-rate matching and decoding are carried out after physical resource mapping, de-precoding and layer mapping, balancing and demodulation, so as to obtain Cyclic Redundancy Check (CRC) of a coding block or a transmission block of the PDSCH; and taking the corresponding assumed DCI format with the obtained cyclic redundancy check code CRC being 0 as a final judgment result.
Furthermore, it is preset that the DCI length N required to perform blind detection is 51bit, and the DCI format with the DCI length of 51bit is DCI 2A in the TM3 transmission mode and DCI2B in the TM8 transmission mode;
in step S3, according to various DCI formats with DCI length of 51bit, the signals of the PDSCH portion are processed and compared, so that the specific process of determining the DCI format is as follows:
for DCI 2A and DCI2B with DCI length of 51 bit:
assuming that the DCI format to be determined is DCI 2A; under the assumption of DCI 2A, after physical resource mapping, precoding and layer mapping, equalization and demodulation are carried out, descrambling, rate de-matching and decoding processing are carried out, and Cyclic Redundancy Check (CRC) of a coding block or a transmission block of the PDSCH is obtained2AJudging the cyclic redundancy check code CRC2AIf the DCI is 0, taking the DCI 2A as a final judgment result, and otherwise, taking the DCI2B as a final judgment result;
or, for DCI 2A and DCI2B with DCI length of 51 bit:
assuming that the DCI format to be determined is DCI 2B; under DCI2B assumption, by solutionAfter physical resource mapping, precoding and layer mapping, equalization and demodulation, descrambling, rate de-matching and decoding are carried out to obtain Cyclic Redundancy Check (CRC) of a code block or a transmission block of the PDSCH2BJudging the cyclic redundancy check code CRC2BAnd if the number of the DCI is 0, taking the DCI2B as a final judgment result, and otherwise, taking the DCI 2A as a final judgment result.
The second purpose of the invention is realized by the following technical scheme:
a method for judging a transmission mode in an LTE system based on the method for judging the DCI format in the LTE system comprises the following steps:
step S4, determining the transmission mode of the LTE system according to the final DCI format judgment result, and when the DCI format judgment result is DCI 2A, judging that the transmission mode in the LTE system is TM 3; and when the final determination result of the DCI format is DCI2B, determining that the transmission mode in the LTE system is TM 8.
Compared with the prior art, the invention has the following advantages and effects:
(1) the invention relates to a method for judging a DCI format in an LTE system, which presets a DCI length N needing blind detection; blind detecting a PDCCH with DCI length of N in an LTE wireless network; after the PDCCH with the DCI length N is detected, signals of the PDSCH part are processed and compared and judged according to various DCI formats corresponding to the DCI length N, and the DCI formats are judged. The method can quickly judge the DCI format with consistent total length and similar meaning of each field in the LTE system, and has the advantages of small operand, low complexity and good judgment effect.
(2) In the method, the format of the DCI can be judged by calculating the normalized coherent accumulation value of the channel estimation value, and the mode has the minimum computation amount and the minimum complexity to equipment. The invention can also judge the format of the DCI by calculating the EVM (error vector magnitude) of the corresponding PDSCH symbol, and the method has better operation amount, complexity and judgment effect on equipment. The present invention can also determine the format of the DCI by obtaining the CRC of the corresponding PDSCH, which is the best determination when the signal quality is better.
(3) According to the method for judging the transmission mode in the LTE system, after the DCI format is judged by the method for judging the DCI format, the transmission mode in the LTE system can be judged according to the DCI format, wherein when the final judgment result of the DCI format is DCI 2A, the transmission mode in the LTE system is judged to be TM 3; and when the final determination result of the DCI format is DCI2B, determining that the transmission mode in the LTE system is TM 8. The method can rapidly judge the transmission mode of the LTE system under the condition of judging the DCI format, and has the advantages of simplicity and rapidness.
Drawings
Fig. 1 is a flowchart of a DCI format and transmission mode determining method in an LTE system according to the present invention.
Fig. 2 is a flowchart of processing and comparing PDSCH partial signals in embodiment 1 of the present invention.
Fig. 3a and 3b are flowcharts of processing and comparing the signals of the PDSCH portion in embodiment 2 of the present invention.
Fig. 4a and 4b are flowcharts of processing and comparing the signals of the PDSCH portion in embodiment 3 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
Example 1
The present embodiment discloses a method for determining a DCI format in an LTE system, as shown in fig. 1, the steps are as follows:
step S1, the third-party LTE downlink receiver presets DCI length N which needs to be blindly detected;
step S2, the third-party LTE downlink receiver blindly detects the PDCCH with the DCI length of N in the LTE wireless network;
step S3, after detecting the PDCCH with DCI length N, the third-party LTE downlink receiver processes and compares the PDSCH partial signals according to various DCI formats corresponding to DCI length N, thereby determining the DCI format.
In step S3 of this embodiment, signals of the PDSCH portion are processed and compared according to various DCI formats with DCI length N, so that the specific procedure for determining the DCI format is as follows:
assuming that the DCI format to be determined is one of various DCI formats with the DCI length of N, then resolving a field of the DCI format to be determined according to the field of the DCI format, then calculating a channel estimation value sequence of the DCI format to be determined under the DCI format, calculating a normalized coherent accumulation value of the channel estimation value sequence, and finally determining whether the normalized coherent accumulation value of the channel estimation value sequence is greater than a preset threshold value, if so, taking the DCI format as a final determination result, and if not, excluding the DCI format as the DCI format to be determined.
In TDD, 20MHz bandwidth, and mode where the base station has 2 transmitting antenna ports, in step S1 of this embodiment, the DCI length N to be blind detected is preset to be 51bit, where the DCI format with DCI length 51bit is DCI 2A in TM3 transmission mode and DCI2B in TM8 transmission mode; then, in step S3, according to various DCI formats with DCI length of 51bit, the PDSCH partial signal is processed and compared to determine, so that the specific process of determining the DCI format is as shown in fig. 2:
firstly, the DCI format to be determined is assumed to be DCI2B with the DCI length of 51bit, each field of the DCI format to be determined is analyzed according to the field of the DCI2B, and then a channel estimation sequence is obtained according to the channel estimation method of the UE specific reference signal on the antenna Port7 and the antenna Port8 corresponding to the DCI2B
Figure BDA0001571940570000081
Wherein i represents a subcarrier number, j represents an OFDM symbol number, s represents a transmission port number, and t represents a reception antenna number;
then calculating a channel estimation sequence
Figure BDA0001571940570000082
Normalized coherent accumulation value ρ:
Figure BDA0001571940570000083
finally, the channel estimation sequence is carried out
Figure BDA0001571940570000084
Comparing the normalized coherent accumulated value rho with a preset threshold value T; if rho is larger than T, taking the DCI2B as a final judgment result; otherwise, the DCI 2A is used as a final determination result. The preset threshold value T has the value range as follows: 0<T<1. In this embodiment, the value of the preset threshold T is 0.4.
The embodiment also discloses a method for determining a transmission mode in the LTE system, which is implemented based on the method for determining the DCI format in the LTE system, and includes the following steps:
step S4, determining the transmission mode of the LTE system according to the final DCI format judgment result, and when the DCI format judgment result is DCI 2A, judging that the transmission mode in the LTE system is TM 3; and when the final determination result of the DCI format is DCI2B, determining that the transmission mode in the LTE system is TM 8.
Example 2
The present embodiment discloses a method for determining a DCI format in an LTE system, which is different from embodiment 1 only in that the specific process of determining the DCI format in step S3 is different from embodiment 1.
In step S3 of this embodiment, signals of the PDSCH portion are processed and compared according to various DCI formats with DCI length N, so that the specific procedure for determining the DCI format is as follows:
for each DCI format with the DCI length of N, respectively assuming that the DCI format needing to be determined is the DCI format, and analyzing the field of the DCI format needing to be determined according to the field of the DCI format; under the assumption of each DCI format, demodulating to obtain a corresponding PDSCH modulation symbol after physical resource mapping, channel estimation, layer mapping and precoding and equalization processing, and then calculating an error vector amplitude average value of the modulation symbol; and finally, comparing the error vector amplitude average values of the modulation symbols calculated under the assumption of each DCI format, finding the minimum error vector amplitude average value of one modulation symbol, and taking the DCI format assumed when the error vector amplitude average value of the modulation symbol is correspondingly calculated as a final judgment result.
In TDD, 20MHz bandwidth, and mode where the base station has 2 transmitting antenna ports, in step S1 of this embodiment, when the DCI length N required to perform blind detection is preset to be 51bit, the DCI format with DCI length 51bit is DCI 2A in TM3 transmission mode and DCI2B in TM8 transmission mode; then, in step S3 of this embodiment, according to various DCI formats with DCI length of 51bit, the PDSCH partial signal is processed and compared, so that the specific procedure for determining the DCI format is as follows:
for DCI 2A and DCI2B with DCI length of 51 bit:
as shown in fig. 3a, assuming that the DCI format to be determined is DCI 2A, parsing a field of the DCI format to be determined according to the field of the DCI 2A; under the assumption of DCI 2A, demodulating to obtain a corresponding PDSCH modulation symbol after physical resource mapping, channel estimation, layer mapping and precoding and equalization processing
Figure BDA0001571940570000091
Then calculating the average value E of Error Vector Magnitude (EVM) of modulation symbols according to the modulation mode obtained by MCS in the information of the transmission block 1 or the information of the transmission block 2 in the DCI format field determined as required2A。
As shown in fig. 3B, assuming that the DCI format to be determined is DCI2B, parsing the field of the DCI format to be determined according to the field of the DCI 2B; under the assumption of DCI2B, demodulating to obtain a corresponding PDSCH modulation symbol after physical resource mapping, channel estimation, layer mapping and precoding and equalization processing
Figure BDA0001571940570000101
Then calculating the average value E of Error Vector Magnitude (EVM) of modulation symbols according to the modulation mode obtained by MCS in the information of the transmission block 1 or the information of the transmission block 2 in the DCI format field determined as required2B。
Calculated under the assumption of DCI 2AModulation symbol
Figure BDA0001571940570000102
Error vector magnitude average E2AModulation symbol calculated under the assumption of DCI2B
Figure BDA0001571940570000103
Error vector magnitude average E2BMaking a comparison if E2A≤E2BAnd taking the DCI 2A as a final judgment result, otherwise, taking the DCI2B as a final judgment result.
Example 3
This embodiment also discloses a method for determining a DCI format in an LTE system, which is different from embodiments 1 and 2 only in that the specific process of determining the DCI format in step S3 is different from embodiments 1 and 2.
In step S3 of this embodiment, signals of the PDSCH portion are processed and compared according to various DCI formats with DCI length N, so that the specific procedure for determining the DCI format is as follows:
for each DCI format with the DCI length of N, respectively assuming that the DCI format needing to be judged is the DCI format; under the assumption of each DCI format, descrambling, de-rate matching and decoding are carried out after physical resource mapping, de-precoding and layer mapping, balancing and demodulation, so as to obtain Cyclic Redundancy Check (CRC) of a coding block or a transmission block of the PDSCH; and taking the corresponding assumed DCI format with the obtained cyclic redundancy check code CRC being 0 as a final judgment result.
In TDD, 20MHz bandwidth and mode that the base station has 2 transmit antenna ports, step S1 in this embodiment preset DCI length N that needs to perform blind detection to be 51bit, where the DCI format with DCI length 51bit is DCI 2A in TM3 transmission mode and DCI2B in TM8 transmission mode, then in step S3 in this embodiment, according to various DCI formats with DCI length 51bit, signals of PDSCH portion are processed and compared and determined, so that the specific process of determining DCI format is as follows:
for DCI 2A and DCI2B with DCI length of 51 bit: as shown in fig. 4a, falseSetting the DCI format to be judged as DCI 2A; under the assumption of DCI 2A, after physical resource mapping, precoding and layer mapping, equalization and demodulation are carried out, descrambling, rate de-matching and decoding processing are carried out, and Cyclic Redundancy Check (CRC) of a coding block or a transmission block of the PDSCH is obtained2AJudging the cyclic redundancy check code CRC2AAnd if the number of the DCI is 0, taking the DCI 2A as a final judgment result, and otherwise, taking the DCI2B as a final judgment result.
Or, in this embodiment, for DCI 2A and DCI2B with a DCI length of 51 bit: as shown in fig. 4B, the DCI format to be determined may be assumed to be DCI 2B; under the assumption of DCI2B, after physical resource mapping, precoding and layer mapping, equalization and demodulation are carried out, descrambling, rate de-matching and decoding processing are carried out, and Cyclic Redundancy Check (CRC) of a coding block or a transmission block of the PDSCH is obtained2BJudging the cyclic redundancy check code CRC2BAnd if the number of the DCI is 0, taking the DCI2B as a final judgment result, and otherwise, taking the DCI 2A as a final judgment result.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims (10)

1. A method for judging DCI format in LTE system is characterized by comprising the following steps:
step S1, presetting DCI length N needing blind detection;
step S2, detecting the PDCCH with the DCI length of N in the LTE wireless network in a blind mode;
step S3, after detecting the PDCCH having DCI length N, processes and compares the PDSCH partial signals according to the various DCI formats corresponding to DCI length N, thereby determining the DCI format.
2. The method for determining DCI formats in an LTE system according to claim 1, wherein in step S3, signals of the PDSCH portion are processed and compared according to various DCI formats with DCI length N, so as to determine the DCI format, and the specific process is as follows:
assuming that the DCI format to be determined is one of various DCI formats with the DCI length of N, then resolving a field of the DCI format to be determined according to the field of the DCI format, then calculating a channel estimation value sequence of the DCI format to be determined under the DCI format, calculating a normalized coherent accumulation value of the channel estimation value sequence, and finally determining whether the normalized coherent accumulation value of the channel estimation value sequence is greater than a preset threshold value, if so, taking the DCI format as a final determination result, and if not, excluding the DCI format as the DCI format to be determined.
3. The method of claim 2, wherein in step S1, the DCI format N required to be blindly detected is preset to be 51bit, and the DCI format with DCI length 51bit is DCI 2A under TM3 transmission mode and DCI2B under TM8 transmission mode;
in step S3, according to various DCI formats with DCI length of 51bit, the signals of the PDSCH portion are processed and compared, so that the specific process of determining the DCI format is as follows:
firstly, the DCI format to be determined is assumed to be DCI2B with the DCI length of 51bit, each field of the DCI format to be determined is analyzed according to the field of the DCI2B, and a channel estimation sequence is obtained according to the channel estimation method of the UE specific reference signal on the antenna Port7 and the antenna Port8 corresponding to the DCI2B
Figure FDA0001571940560000011
Wherein i represents a subcarrier number, j represents an OFDM symbol number, s represents a transmission port number, and t represents a reception antenna number;
then calculating a channel estimation sequence
Figure FDA0001571940560000012
Normalized coherent accumulation value ρ:
Figure FDA0001571940560000021
finally, the channel estimation sequence is carried out
Figure FDA0001571940560000022
Comparing the normalized coherent accumulated value rho with a preset threshold value T; if rho is larger than T, taking the DCI2B as a final judgment result; otherwise, the DCI 2A is used as a final determination result.
4. The method for determining the DCI format in the LTE system according to claim 3, wherein the preset threshold T has a value range of: 0< T < 1.
5. The method for determining the DCI format in the LTE system according to claim 4, wherein the value of said preset threshold T is 0.4.
6. The method for determining DCI formats in LTE system according to claim 1, wherein in step S3, the specific procedure of processing and comparing the PDSCH partial signal according to the various DCI formats with the preset DCI length is as follows:
for each DCI format with the DCI length of N, respectively assuming that the DCI format needing to be judged is the DCI format; under the assumption of each DCI format, demodulating to obtain a corresponding PDSCH modulation symbol after physical resource mapping, channel estimation, layer mapping and precoding and equalization processing, and then calculating an error vector amplitude average value of the modulation symbol; and finally, comparing the error vector amplitude average values of the modulation symbols calculated under the assumption of each DCI format, finding the minimum error vector amplitude average value of one modulation symbol, and taking the DCI format assumed when the error vector amplitude average value of the modulation symbol is correspondingly calculated as a final judgment result.
7. The method of claim 6, wherein in step S1, the predetermined DCI length N required for blind detection is 51bit, and the DCI format with DCI length 51bit is DCI 2A under TM3 transmission mode and DCI2B under TM8 transmission mode;
in step S3, according to various DCI formats with DCI length of 51bit, the signals of the PDSCH portion are processed and compared, so that the specific process of determining the DCI format is as follows:
for DCI 2A and DCI2B with DCI length of 51 bit:
assuming that the DCI format to be determined is DCI 2A; under the assumption of DCI 2A, demodulating to obtain a corresponding PDSCH modulation symbol after physical resource mapping, channel estimation, layer mapping, precoding and equalization processing, and then calculating an error vector amplitude average value E of the modulation symbol2A；
Assuming that the DCI format to be determined is DCI 2B; under the assumption of DCI2B, demodulating to obtain corresponding PDSCH modulation symbols through physical resource mapping, channel estimation, layer mapping, precoding and equalization processing, and then calculating the error vector amplitude average value E of the modulation symbols2B；
Error vector amplitude average value E of modulation symbols calculated under the assumption of DCI 2A2AAnd the error vector amplitude average value E of the modulation symbols calculated under the assumption of DCI2B2BMaking a comparison if E2A≤E2BAnd taking the DCI 2A as a final judgment result, otherwise, taking the DCI2B as a final judgment result.
8. The method for determining DCI formats in LTE system according to claim 1, wherein in step S3, the specific procedure of processing and comparing the PDSCH partial signal according to the various DCI formats with the preset DCI length is as follows:
for each DCI format with the DCI length of N, respectively assuming that the DCI format needing to be judged is the DCI format; under the assumption of each DCI format, descrambling, de-rate matching and decoding are carried out after physical resource mapping, de-precoding and layer mapping, balancing and demodulation, so as to obtain Cyclic Redundancy Check (CRC) of a coding block or a transmission block of the PDSCH; and taking the corresponding assumed DCI format with the obtained cyclic redundancy check code CRC being 0 as a final judgment result.
9. The method of claim 8, wherein the predetermined DCI length N required for blind detection is 51bit, and the DCI format with DCI length 51bit is DCI 2A under TM3 transmission mode and DCI2B under TM8 transmission mode;
in step S3, according to various DCI formats with DCI length of 51bit, the signals of the PDSCH portion are processed and compared, so that the specific process of determining the DCI format is as follows:
for DCI 2A and DCI2B with DCI length of 51 bit:
assuming that the DCI format to be determined is DCI 2A; under the assumption of DCI 2A, after physical resource mapping, precoding and layer mapping, equalization and demodulation are carried out, descrambling, rate de-matching and decoding processing are carried out, and Cyclic Redundancy Check (CRC) of a coding block or a transmission block of the PDSCH is obtained2AJudging the cyclic redundancy check code CRC2AIf the DCI is 0, taking the DCI 2A as a final judgment result, and otherwise, taking the DCI2B as a final judgment result;
or, for DCI 2A and DCI2B with DCI length of 51 bit:
assuming that the DCI format to be determined is DCI 2B; under the assumption of DCI2B, after physical resource mapping, precoding and layer mapping, equalization and demodulation are carried out, descrambling, rate de-matching and decoding processing are carried out, and Cyclic Redundancy Check (CRC) of a coding block or a transmission block of the PDSCH is obtained2BJudging the cyclic redundancy check code CRC2BAnd if the number of the DCI is 0, taking the DCI2B as a final judgment result, and otherwise, taking the DCI 2A as a final judgment result.
10. A method for determining a transmission mode in an LTE system, which is implemented based on the method for determining a DCI format in the LTE system according to claim 1, the method comprising the steps of:
step S4, determining the transmission mode of the LTE system according to the final DCI format judgment result, and when the DCI format judgment result is DCI 2A, judging that the transmission mode in the LTE system is TM 3; and when the final determination result of the DCI format is DCI2B, determining that the transmission mode in the LTE system is TM 8.
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CN113890681B (en) * 2021-09-28 2023-12-08 中信科移动通信技术股份有限公司 Method and system for identifying downlink transmission mode
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CN115038186B (en) * 2022-08-09 2022-11-01 杰创智能科技股份有限公司 Blind detection method and device of LTE (Long term evolution) system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011047506A1 (en) * 2009-10-20 2011-04-28 华为技术有限公司 Method for blind detection of physical downlink control channel (pdcch), and method and device for scheduling resources
CN102255688A (en) * 2011-07-06 2011-11-23 合肥东芯通信股份有限公司 LTEPDCCH (Long Term Evolution System Physical Downlink Control Channel) blind inspection control method and device
CN102624404A (en) * 2011-01-31 2012-08-01 中兴通讯股份有限公司 Tail-biting convolutional code decoding checking method and apparatus thereof
CN104753634A (en) * 2013-12-31 2015-07-01 展讯通信（上海）有限公司 DCI (Downlink Control Information) detection method and device
CN106170961A (en) * 2014-04-21 2016-11-30 Lg 电子株式会社 The method and apparatus supporting different districts scope according to modulation in wireless communication system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110040672A (en) * 2009-10-12 2011-04-20 주식회사 팬택 Appratus and method for transmitting and receiving control channel in wireless communication system
WO2012173432A2 (en) * 2011-06-15 2012-12-20 엘지전자 주식회사 Method for receiving downlink control information in wireless access system and terminal therefor
CN104125035B (en) * 2013-04-23 2017-05-24 展讯通信（上海）有限公司 Method and apparatus for DCI false detection screening
CN103701564B (en) * 2013-12-12 2016-09-21 北京邮电大学 The implementation method of PDCCH total blindness detection in a kind of LTE system
CN103780343B (en) * 2014-01-13 2017-02-15 重庆邮电大学 Device and method for PHICH resource blind detection in SIB1 decoding in TD-LTE system
CN107222444B (en) * 2014-07-10 2020-02-14 上海数字电视国家工程研究中心有限公司 Method for receiving and processing preamble symbol in physical frame
CN104683069B (en) * 2015-02-13 2018-04-27 大唐联仪科技有限公司 A kind of physical downlink control channel PDCCH blind checking method and system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011047506A1 (en) * 2009-10-20 2011-04-28 华为技术有限公司 Method for blind detection of physical downlink control channel (pdcch), and method and device for scheduling resources
CN102624404A (en) * 2011-01-31 2012-08-01 中兴通讯股份有限公司 Tail-biting convolutional code decoding checking method and apparatus thereof
CN102255688A (en) * 2011-07-06 2011-11-23 合肥东芯通信股份有限公司 LTEPDCCH (Long Term Evolution System Physical Downlink Control Channel) blind inspection control method and device
CN104753634A (en) * 2013-12-31 2015-07-01 展讯通信（上海）有限公司 DCI (Downlink Control Information) detection method and device
CN106170961A (en) * 2014-04-21 2016-11-30 Lg 电子株式会社 The method and apparatus supporting different districts scope according to modulation in wireless communication system

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