WO2016127819A1 - 一种物理下行控制信道pdcch盲检测方法和系统 - Google Patents

一种物理下行控制信道pdcch盲检测方法和系统 Download PDF

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Publication number
WO2016127819A1
WO2016127819A1 PCT/CN2016/072504 CN2016072504W WO2016127819A1 WO 2016127819 A1 WO2016127819 A1 WO 2016127819A1 CN 2016072504 W CN2016072504 W CN 2016072504W WO 2016127819 A1 WO2016127819 A1 WO 2016127819A1
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data
bit data
pdcch
dci
control channel
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PCT/CN2016/072504
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English (en)
French (fr)
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王海侠
刘亚郡
谭春白
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大唐联仪科技有限公司
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Priority to JP2017560855A priority Critical patent/JP6554558B2/ja
Priority to KR1020177025860A priority patent/KR101886397B1/ko
Priority to US15/550,770 priority patent/US10165562B2/en
Priority to EP16748620.8A priority patent/EP3258629B1/en
Publication of WO2016127819A1 publication Critical patent/WO2016127819A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0036Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
    • H04L1/0038Blind format detection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045Arrangements at the receiver end
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/23Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045Arrangements at the receiver end
    • H04L1/0046Code rate detection or code type detection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056Systems characterized by the type of code used
    • H04L1/0059Convolutional codes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056Systems characterized by the type of code used
    • H04L1/0067Rate matching
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0003Two-dimensional division
    • H04L5/0005Time-frequency
    • H04L5/0007Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H04L5/0046Determination of how many bits are transmitted on different sub-channels
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053Allocation of signaling, i.e. of overhead other than pilot signals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056Systems characterized by the type of code used
    • H04L1/0061Error detection codes

Definitions

  • the present application relates to communications technologies, and in particular, to a physical downlink control channel PDCCH blind detection method and system technology.
  • the physical downlink control channel (PDCCH) carries the uplink and downlink control information of the entire system, which is closely related to the resource scheduling and allocation of the entire system.
  • the receiving of the channel plays a very important role in the LTE system. Its reception determines the delay of the entire system, which in turn affects the overall response speed.
  • the number of symbols occupied by the PDCCH in one subframe in LTE is determined by a Control Format Indicator (CFI) defined in a Physical Control Format Indicator Channel (PCFICH).
  • CFI Control Format Indicator
  • PCFICH Physical Control Format Indicator Channel
  • the UE determines the physical cell identifier by using the primary and secondary synchronization signals, and reads the physical broadcast signal.
  • the Physical Broadcast Channel determines the resource distribution occupied by the Physical Hybrid-ARQ Indicator Channel (PHICH), the antenna port of the system, and the like.
  • the UE can further read the PCFICH to obtain the number of OFDM symbols occupied by the control channel such as the PDCCH.
  • the symbols occupied by the PDCCH include, in addition to the PDCCH, contents such as a PCFICH, a PHICH, and a reference signal (Reference Signal, RS).
  • contents such as a PCFICH, a PHICH, and a reference signal (Reference Signal, RS).
  • the content of the PCFICH has been demodulated, the distribution of the PHICH is determined by the PBCH, and the distribution of the RS depends on the number of antenna ports broadcasted in the PBCH. Therefore, all resource elements (Resource Element, RE) that the PDCCH can occupy in one subframe are determined.
  • RE resource elements
  • LTE defines two dedicated control channel resource units: RE group (REG) and Control Channel Element (CCE).
  • REG is composed of four or six adjacent REs located on the same OFDM symbol, but the number of REs available therein is only four, and the REG composed of six REs includes two reference signals, and the reference signal RS The occupied RE is not used by the REG of the control channel.
  • the protocol (36.211) also specifies that for the case of only one cell-specific reference signal, from the perspective of RE mapping in the REG, it is assumed that there are two antenna ports, so there are two cases in which one REG contains 4 or 6 REs. .
  • a CCE consists of 9 REGs.
  • PDCCH format Number of CCEs Number of resource particle groups PDCCH bit number 0 1 9 72 1 2 18 144 2 4 36 288 3 8 72 576
  • the number of available CCEs is from 0 to NCCE-1.
  • CCEs can be considered as logical resources, arranged in order, and shared by all PDCCHs.
  • the eNodeB places each PDCCH in a suitable location according to the limitation of the CCE starting position on each PDCCH. At this time, there may be cases where the CCE is not occupied.
  • the standard requires that NIL be inserted (indicating no value), and the transmission power on the RE corresponding to the NIL is 0.
  • the data bits on the CCE pass through a scrambling code associated with the physical ID of the cell, Quaternary Phase Shift Keying (QPSK) modulation, layer mapping and precoding, and the obtained symbols are in units of quaternions ( Symbol Quadruplet, each quad is mapped to a REG) is interleaved and cyclically shifted, and finally mapped to the corresponding physical resource REG.
  • QPSK Quaternary Phase Shift Keying
  • the present invention provides a PDCCH blind detection method and system for a physical downlink control channel, so as to solve the problem that the existing PDCCH blind detection requires a relatively long operation time to determine the RNTI when the RNTI is unknown.
  • the present application discloses a method for detecting a physical downlink control channel PDCCH blindly, including:
  • the present application also discloses a physical downlink control channel PDCCH blind detection system, including:
  • a first data acquiring module configured to acquire PDCCH data
  • a second data acquiring module configured to group the PDCCH data according to a location identifier of a resource element, and obtain soft bit data according to each group of PDCCH data after the grouping;
  • a third data acquiring module configured to obtain control channel unit soft bit data from the soft bit data
  • a DCI data acquiring module configured to determine downlink control information DCI data according to the control channel unit soft bit data
  • the wireless network temporary identifier obtaining module is configured to obtain a random access wireless network temporary identifier according to the DCI data, and complete PDCCH blind detection.
  • the present application includes the following advantages:
  • the technical solution of the present application is PDCCH blind detection when the RNTI of each user is unknown and the number of users is unknown.
  • the present application performs power detection on the received PDCCH information, and then groups the consecutive REs, performs channel equalization, detection demodulation, and descrambling for each group of data, and extracts according to different aggregation levels.
  • XOR calculation to get the correct RNTI The technical solution of the present application is applicable to the case where the user RNTI is uncertain, which can ensure the accuracy of the PDCCH blind detection, and greatly reduces the calculation amount and the calculation time.
  • FIG. 1 is a flowchart of steps of a PDCCH blind detection method according to Embodiment 1 of the present application;
  • FIG. 2 is a flow chart of steps of a PDCCH blind detection method in Embodiment 2 of the present application;
  • FIG. 3 is a flowchart of steps of a PDCCH blind detection method in Embodiment 3 of the present application.
  • FIG. 6 is a schematic structural diagram of a PDCCH blind detection system according to Embodiment 6 of the present application.
  • An embodiment of the present application provides a low-complexity PDCCH blind detection method, including: determining, according to a demodulation and decoding PCFICH, a number of OFDM symbols of a control channel, and determining, by using system configuration information, all REs occupied by a PDCCH in one subframe.
  • Position through the power detection, obtain valid PDCCH data on the control channel; group the PDCCH data according to the RE position, perform channel equalization, demodulation, descrambling, and obtain soft bits for each group of PDCCH data; according to the PDCCH data of each group Length determines the possible aggregation level, extracts data from soft bits according to different aggregation levels and starting positions; performs de-rate matching and decoding on the extracted data according to all possible DCI formats, and obtains correct according to the tail-biting convolutional coding characteristics. DCI; get the correct RNTI based on the CRC check bits.
  • a PDCCH blind detection method provided by an embodiment of the present application is described in detail.
  • Step 100 Determine, according to the number of OFDM symbols occupied by the PDCCH obtained by decoding the PCFICH, and the system configuration information, determine the RE positions occupied by all the PDCCHs in one subframe, and obtain valid PDCCH data on the control channel by using power detection.
  • the step 100 can include:
  • the N symbols occupied by the PDCCH include, in addition to the PDCCH, contents such as PCFICH, PHICH, RS, and the like.
  • the content of the PCFICH has been demodulated, the distribution of the PHICH is determined by the PBCH, and the distribution of the RS depends on the number of antenna ports broadcasted in the PBCH. Therefore, it is possible to determine the REs occupied by all PDCCHs in one subframe.
  • n is the number of all REs
  • RE_FLAG[n] is the corresponding identification information
  • Step 102 The PDCCH data is grouped according to the RE location, and each group of data is separately subjected to channel equalization, demodulation, and descrambling to acquire soft bits.
  • the step 102 may include:
  • Step 104 Determine a possible aggregation level according to the data length of each group, take the data header as a starting position, and extract data from the soft bits according to different aggregation levels and starting positions.
  • the step 104 may include:
  • the number of CCEs per group N CCE is compared to all possible aggregation levels.
  • Sub-step 1045 determining whether the CCE group has detected a DCI letter.
  • the group of interest ends if there is an intersection between the two; if there is no intersection at all, the data is fetched in the soft bit Soft_bits_all obtained in step 102 according to the starting position of the CCE.
  • the length of the data Soft_cce_bits is L Soft_cce_bits and proceeds to step 106.
  • Step 106 De-rate matching and decoding the data according to all possible DCI formats, and performing convolutional coding and rate matching on the decoded data according to the tail-biting convolution coding characteristic to obtain information bit data.
  • the information bits are compared with the data before decoding to obtain the correct DCI.
  • Sub-step 1061 determines all possible DCI formats according to the 3GPP TS 36.213 protocol and the correspondence between the DCI format and the transmission mode.
  • Sub-step 1062 according to the 3GPP protocol TS 36.212, the length of different DCI formats can be calculated by the protocol;
  • the steps of the rate matching include: bit reception, bit separation, sub-block de-interleaving; convolutional decoding uses a Viterbi probability decoding algorithm.
  • the Viterbi decoding algorithm takes into account the statistical properties of the channel, calculates the distance between the received codeword and all possible raster paths, and picks out the raster path closest to the received codeword as the Viterbi decoding output.
  • Viterbi decoding is a decoding algorithm well known to those skilled in the art and will not be described here.
  • the soft bit Soft_cce_bits[n] before the decoding is hard-decided to obtain the hard bit Hard_cce_bits[n].
  • the hard bits are compared with the rate matched data bits RateMatch_bits[n] one by one.
  • Step 108 Extract the decoded CRC check bit according to the CRC check bit, and perform an exclusive OR calculation on the CRC check bit according to the DCI information after decoding to obtain a correct RNTI.
  • the step 108 may include:
  • Sub-step 1082 performing an exclusive-OR calculation on the CRC bit CRC[n] decoded by sub-step 1063 and the CRC check bit CRC_bits[n] calculated in sub-step 1081, to obtain the correct RNTI, ie,
  • the technical solution of the embodiment of the present application is that the RNTI of each user is unknown, and the PDCCH is blindly detected when the number of users is unknown.
  • the present application performs power detection on the received PDCCH information, and then groups the consecutive REs, performs channel equalization, detection demodulation, and descrambling for each group of data, and extracts according to different aggregation levels. Data, de-rate matching and decoding all possible DCI formats, obtaining the correct DCI according to the convolutional coding characteristics, and finally taking out the decoded CRC check bits and decoding the CRC check bits calculated according to the DCI. XOR calculation to get the correct RNTI.
  • the technical solution of the present application is applicable to a situation in which the user RNTI is uncertain, and the accuracy of the PDCCH blind detection can be ensured. The calculation amount and calculation time are greatly reduced.
  • a PDCCH blind detection method provided by an embodiment of the present application is described in detail.
  • FIG. 2 a flow chart of steps of a PDCCH blind detection method in an embodiment of the present application is shown.
  • step 200 PDCCH data on all control channels is taken out.
  • Step 202 Determine whether the power P RE of the RE is greater than a power threshold P lim ; if it is greater, perform step 204.
  • step 206 channel equalization, detection demodulation, and descrambling are performed for each group of REs.
  • step 210 the data header is used as a starting position, and data is extracted according to different aggregation levels.
  • Step 212 Perform rate matching and convolutional decoding according to different DCI types.
  • Step 216 comparing whether the information bits before decoding are equal to the convolutionally encoded information bits; if they are equal, step 218 is performed; if not, step 222 is performed.
  • Step 218 The calculated CRC check bit is XORed with the decoded check bit to obtain an RNTI.
  • Step 220 Clear the CCE that has detected the DCI information, and jump out of the DCI type detection loop.
  • step 224 it is determined whether to traverse all the aggregation levels; if yes, step 226 is performed; if not, step 210 is performed.
  • step 226 it is determined whether all data is analyzed; if so, the blind detection ends; if not, step 204 is performed.
  • the technical solution of the embodiment of the present application is that the RNTI of each user is unknown.
  • the PDCCH blind detection in the case where the number of users is also unknown.
  • the present application performs power detection on the received PDCCH information, and then groups the consecutive REs, performs channel equalization, detection demodulation, and descrambling for each group of data, and extracts according to different aggregation levels. Data, de-rate matching and decoding all possible DCI formats, obtaining the correct DCI according to the convolutional coding characteristics, and finally taking out the decoded CRC check bits and decoding the CRC check bits calculated according to the DCI. XOR calculation to get the correct RNTI.
  • the technical solution of the present application is applicable to the case where the user RNTI is uncertain, which can ensure the accuracy of the PDCCH blind detection, and greatly reduces the calculation amount and the calculation time.
  • FIG. 3 a flow chart of steps of a PDCCH blind detection method in an embodiment of the present application is shown.
  • Step 300 Acquire PDCCH data.
  • Step 302 The PDCCH data is grouped according to the location identifier of the resource element, and the soft bit data is obtained according to each group of PDCCH data after the grouping.
  • Step 304 Acquire control channel unit soft bit data from the soft bit data.
  • the control channel unit soft bit data is extracted from the soft bit data according to different aggregation levels and starting positions.
  • Step 306 Determine downlink control information DCI data according to the control channel unit soft bit data.
  • the rate matching obtains information bit data, and compares the information bits with the data before decoding to obtain a correct DCI.
  • Step 308 Acquire a temporary identifier of the random access wireless network according to the DCI data, and complete PDCCH blind detection.
  • the decoded CRC check bit is extracted and the CRC check bit is calculated according to the DCI information after decoding, and the XOR is calculated to obtain the correct RNTI.
  • the technical solution of the embodiment of the present application is that the RNTI of each user is unknown, and the PDCCH is blindly detected when the number of users is unknown.
  • the present application performs power detection on the received PDCCH information, and then groups the consecutive REs, performs channel equalization, detection demodulation, and descrambling for each group of data, and extracts according to different aggregation levels. Data, de-rate matching and decoding all possible DCI formats, obtaining the correct DCI according to the convolutional coding characteristics, and finally taking out the decoded CRC check bits and decoding the CRC check bits calculated according to the DCI. XOR calculation to get the correct RNTI.
  • the technical solution of the present application is applicable to the case where the user RNTI is uncertain, which can ensure the accuracy of the PDCCH blind detection, and greatly reduces the calculation amount and the calculation time.
  • FIG. 4 a flow chart of steps of a PDCCH blind detection method in an embodiment of the present application is shown.
  • Step 400 Acquire PDCCH data.
  • the step 400 may include:
  • Sub-step 4001 Determine, according to the number of orthogonal frequency division multiple access OFDM symbols occupied by the PDCCH obtained by the coding physical control format indication channel PCFICH, and preset system configuration information, to determine resource elements occupied by the PDCCH in one subframe.
  • Sub-step 4002 performing power detection on the resource element, and acquiring power greater than a set function The PDCCH data corresponding to the resource element of the rate threshold.
  • Step 402 The PDCCH data is grouped according to the location identifier of the resource element, and the soft bit data is obtained according to each group of PDCCH data after the grouping.
  • the step 402 may include:
  • Sub-step 4022 performing channel equalization, demodulation, and descrambling operations on each group of PDCCH data after the packet, to obtain soft bit data.
  • the control channel unit soft bit data is extracted from the soft bit data according to different aggregation levels and starting positions.
  • the step 404 can include:
  • Sub-step 4041 determining an aggregation level of the soft bit data according to an aggregation level corresponding to a common search space and a user equipment-specific search space.
  • Sub-step 4042 starting from the data header of the soft bit data, acquiring control channel unit soft bit data according to an aggregation level of the soft bit data.
  • Step 406 Determine downlink control information DCI data according to the control channel unit soft bit data.
  • the step 406 can include:
  • Sub-step 4061 determining a format of downlink control information DCI carried in the PDCCH.
  • Sub-step 4062 the soft channel data of the control channel unit according to the format of the DCI Decoding and convolutional decoding are performed to obtain decoded bit data.
  • Sub-step 4063 performing convolutional coding and rate matching on the decoded bit data to obtain rate matching bit data.
  • Sub-step 4406 performing hard decision on the control channel unit soft bit data to obtain control channel unit hard bit data.
  • Sub-step 4065 determining whether the rate matching bit data and the control channel unit hard bit data are the same; if they are the same, performing sub-step 4066; if different, the process ends.
  • Sub-step 4066 determining that the decoded bit data is DCI data.
  • the DCI data includes DCI bit data and first cyclic redundancy check CRC bit data.
  • Step 408 Acquire a temporary identifier of the random access wireless network according to the DCI data, and complete PDCCH blind detection.
  • the decoded CRC check bit is extracted and the CRC check bit is calculated according to the DCI information after decoding, and the XOR is calculated to obtain the correct RNTI.
  • the step 408 can include:
  • Sub-step 4081 calculating second CRC bit data according to the DCI data.
  • Sub-step 4082 performing an exclusive-OR calculation on the calculated second CRC bit data and the first CRC bit data in the DCI data to obtain a random access wireless network temporary identifier.
  • the technical solution of the embodiment of the present application is that the RNTI of each user is unknown, and the PDCCH is blindly detected when the number of users is unknown.
  • the present application performs power detection on the received PDCCH information, and then groups the consecutive REs, performs channel equalization, detection demodulation, and descrambling for each group of data, and extracts according to different aggregation levels. Data, de-rate matching and decoding all possible DCI formats, obtaining the correct DCI according to the convolutional coding characteristics, and finally taking out the decoded CRC check bits and decoding the CRC check bits calculated according to the DCI. XOR calculation to get the correct RNTI.
  • the technical solution of the present application is applicable to the case where the user RNTI is uncertain, which can ensure the accuracy of the PDCCH blind detection, and greatly reduces the calculation amount and the calculation time.
  • a PDCCH blind detection system provided by an embodiment of the present application is described in detail.
  • FIG. 5 a schematic structural diagram of a PDCCH blind detection system in an embodiment of the present application is shown.
  • the system may include: a first data acquisition module 500, a second data acquisition module 502, a third data acquisition module 504, a DCI data acquisition module 506, and a wireless network temporary identifier acquisition module 508.
  • the first data obtaining module 500 is configured to acquire PDCCH data.
  • the second data acquiring module 502 is configured to group the PDCCH data according to the location identifier of the resource element, and obtain soft bit data according to each group of PDCCH data after the grouping.
  • the third data obtaining module 504 is configured to acquire control channel unit soft bit data from the soft bit data.
  • the DCI data acquisition module 506 is configured to determine downlink control information DCI data according to the control channel unit soft bit data.
  • the wireless network temporary identifier obtaining module 508 is configured to obtain a random access wireless network temporary identifier according to the DCI data, and complete PDCCH blind detection.
  • the technical solution of the embodiment of the present application is that the RNTI of each user is unknown, and the PDCCH is blindly detected when the number of users is unknown.
  • the present application performs power detection on the received PDCCH information, and then groups the consecutive REs, performs channel equalization, detection demodulation, and descrambling for each group of data, and extracts according to different aggregation levels. Data, de-rate matching and decoding all possible DCI formats, obtaining the correct DCI according to the convolutional coding characteristics, and finally taking out the decoded CRC check bits and decoding the CRC check bits calculated according to the DCI. XOR calculation to get the correct RNTI.
  • the technical solution of the present application is applicable to the case where the user RNTI is uncertain, which can ensure the accuracy of the PDCCH blind detection, and greatly reduces the calculation amount and the calculation time.
  • FIG. 6 a structural diagram of a PDCCH blind detection system in an embodiment of the present application is shown. intention.
  • the system may include: a first data acquisition module 600, a second data acquisition module 602, a third data acquisition module 604, a DCI data acquisition module 606, and a wireless network temporary identifier acquisition module 608.
  • the first data obtaining module 600 may include: a resource element determining module 6001, and a PDCCH data acquiring module 6002.
  • the second data obtaining module 602 can include a grouping module 6021 and a soft bit data acquiring module 6022.
  • the third data obtaining module 604 may include: an aggregation level determining module 6041, and a control channel unit soft bit data acquiring module 6042.
  • the DCI data obtaining module 606 may include: a DCI format determining submodule 6061, a decoding bit data acquiring submodule 6062, a rate matching bit data obtaining submodule 6063, a control channel unit hard bit data obtaining submodule 6064, and a determining submodule 6065.
  • the DCI data determination sub-module 6066 may include: a DCI format determining submodule 6061, a decoding bit data acquiring submodule 6062, a rate matching bit data obtaining submodule 6063, a control channel unit hard bit data obtaining submodule 6064, and a determining submodule 6065.
  • the wireless network temporary identifier obtaining module 608 can include: a computing module 6081, an exclusive OR module 6082.
  • each module and each submodule The functions of each module and each submodule and the relationship between each module and each submodule are described in detail below.
  • the first data obtaining module 600 is configured to acquire PDCCH data.
  • the first data obtaining module 600 may include:
  • the resource element determining module 6001 is configured to determine, according to the number of orthogonal frequency division multiple access OFDM symbols occupied by the PDCCH obtained by the coding physical control format indication channel PCFICH, and preset system configuration information, to determine resources occupied by the PDCCH in one subframe. element.
  • the second data acquiring module 602 is configured to group the PDCCH data according to the location identifier of the resource element, and obtain soft bit data according to each group of PDCCH data after the grouping.
  • the second data obtaining module 602 can include:
  • the grouping module 6021 is configured to set the number of PDCCHs corresponding to consecutive resource elements of the location identifier According to the same group.
  • the soft bit data acquisition sub-module 6022 is configured to perform channel equalization, demodulation, and descrambling operations on each group of PDCCH data after the packet to obtain soft bit data.
  • the third data obtaining module 604 is configured to acquire control channel unit soft bit data from the soft bit data.
  • the third data obtaining module 604 can include:
  • the control channel unit soft bit data obtaining module 6042 is configured to obtain control channel unit soft bit data according to an aggregation level of the soft bit data, starting from a data bit of the soft bit data.
  • the DCI data acquisition module 606 is configured to determine downlink control information DCI data according to the control channel unit soft bit data.
  • the DCI data obtaining module 606 can include:
  • the DCI format determining module 6061 is configured to determine a format of downlink control information DCI carried in the PDCCH.
  • the decoding bit data obtaining module 6062 is configured to perform de-rate matching and convolutional decoding on the control channel unit soft bit data according to the format of the DCI to obtain decoded bit data.
  • the rate matching bit data obtaining module 6063 is configured to perform convolutional coding and rate matching on the decoded bit data to obtain rate matching bit data.
  • the control channel unit hard bit data obtaining module 6064 is configured to perform hard decision on the control channel unit soft bit data to obtain control channel unit hard bit data.
  • the determining sub-module 6065 is configured to determine whether the rate matching bit data and the control channel unit hard bit data are the same.
  • the DCI data determining sub-module 6066 is configured to determine that the decoded bit data is DCI data when the rate matching bit data and the control channel unit hard bit data are the same.
  • the DCI data includes DCI bit data and first cyclic redundancy check CRC bit data.
  • the wireless network temporary identifier obtaining module 608 is configured to obtain a random access wireless network temporary identifier according to the DCI data, and complete PDCCH blind detection.
  • the wireless network temporary identifier obtaining module 608 can include:
  • the calculating module 6081 is configured to calculate the second CRC bit data according to the DCI data.
  • the XOR module 6082 is configured to perform an exclusive-OR calculation on the calculated second CRC bit data and the first CRC bit data in the DCI data to obtain a random access wireless network temporary identifier.
  • the technical solution of the embodiment of the present application is that the RNTI of each user is unknown, and the PDCCH is blindly detected when the number of users is unknown.
  • the present application performs power detection on the received PDCCH information, and then groups the consecutive REs, performs channel equalization, detection demodulation, and descrambling for each group of data, and extracts according to different aggregation levels. Data, de-rate matching and decoding all possible DCI formats, obtaining the correct DCI according to the convolutional coding characteristics, and finally taking out the decoded CRC check bits and decoding the CRC check bits calculated according to the DCI. XOR calculation to get the correct RNTI.
  • the technical solution of the present application is applicable to the case where the user RNTI is uncertain, which can ensure the accuracy of the PDCCH blind detection, and greatly reduces the calculation amount and the calculation time.
  • the computer readable recording medium includes any mechanism for storing or transmitting information in a form readable by a computer (eg, a computer).
  • a machine-readable medium includes read only memory (ROM), random access memory (RAM), magnetic disk storage media, optical storage media, flash storage media, electrical, optical, acoustic, or other forms of propagation signals (eg, carrier waves) , infrared signals, digital signals, etc.).
  • the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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Abstract

一种PDCCH盲检测方法和系统,其中,所述方法包括:获取PDCCH数据;将所述PDCCH数据按照资源元素的位置标识进行分组,根据分组后的每组PDCCH数据得到软比特数据;从所述软比特数据中获取控制信道单元软比特数据;根据所述控制信道单元软比特数据确定DCI数据;根据所述DCI数据获取得到随机接入无线网络临时标识,完成PDCCH盲检测。本申请技术方案适用于用户RNTI不确定的情况,可保证PDCCH盲检测的准确度,大大降低了计算量和计算时间。

Description

一种物理下行控制信道PDCCH盲检测方法和系统 技术领域
本申请涉及通信技术,特别是涉及一种物理下行控制信道PDCCH盲检测方法和系统技术。
背景技术
第三代合作伙伴计划(The 3rd Generation Partner Ship Project,3GPP)长期演进(Long Term Evolution,LTE)是下一代蜂窝移动通信的关键技术。物理层上下行传输方案分别采用峰均比较低的单载波频分多址(Single Carrier Frequency Division Multiple Access,SC-FDMA)和先进成熟的正交频分多址(Orthogonal Frequency Division Multiple Access,OFDMA)技术,在此基础上还引入了如快速链路适应,输入多输出多(Multi-Input Multi-Output,MIMO)技术来提高LTE系统性能。
物理下行控制信道(Physical Downlink Control Channel,PDCCH)上承载了整个系统的上下行控制信息,与整个系统的资源调度和分配密切相关,该信道的接收在LTE系统中扮演了一个非常重要的角色,它的接收决定了整个系统的延迟,继而影响到整体的反应速度。
PDCCH中承载的是下行链路控制信息(Downlink Control Information,DCI),包含一个或多个用户设备(User Equipment,UE)上的资源分配和其它控制信息。通常,在一个子帧内可以有多个PDCCH。UE需要首先解调PDCCH中的DCI,然后才能够在相应的资源位置上解调属于UE自己的物理下行共享信道(Physical Downlink Shared Channel,PDSCH)(包括广播消息,寻呼,UE的数据等)。PDCCH在系统运行过程中会传递多种多样的信息,但是在每一次的传输过程中具体传送哪些信息要由具体的系统部署方案而定。LTE中PDCCH在一个子帧内占用的符号个数,是由物理控制格式指示信道(Physical Control Format Indicator Channel,PCFICH)中定义的控制格式指示(Control Format Indicator,CFI)所确定的。UE通过主辅同步信号,确定了物理小区标识,通过读取物理广播信 道(Physical Broadcast Channel,PBCH),确定了物理HARQ指示信道(Physical Hybrid-ARQ Indicator Channel,PHICH)占用的资源分布,系统的天线端口等内容。UE就可以进一步读取PCFICH,获得PDCCH等控制信道所占用的OFDM符号数目。在PDCCH所占用的符号中,除了PDCCH,还包含有PCFICH,PHICH,参考信号(Reference Signal,RS)等内容。其中PCFICH的内容已经解调,PHICH的分布由PBCH确定,RS的分布取决于PBCH中广播的天线端口数目。因此,所有的PDCCH在一个子帧内所能够占用的资源元素(Resource Element,RE)就确定了。
由于PDCCH的传输带宽内可以同时包含多个PDCCH,为了更有效地配置PDCCH和其他下行控制信道的时频资源,LTE定义了两个专用的控制信道资源单位:RE组(RE Group,REG)和控制信道单元(Control Channel Element,CCE)。1个REG由位于同一OFDM符号上的4个或6个相邻的RE组成,但其中可用的RE数目只有4个,6个RE组成的REG中包含了两个参考信号,而参考信号RS所占用的RE是不能被控制信道的REG使用的。协议中(36.211)还特别规定,对于只有一个小区专用参考信号的情况,从REG中RE映射的角度,要假定存在两个天线端口,所以存在一个REG中包含4个或6个RE两种情况。一个CCE由9个REG构成。
PDCCH在一个或多个连续的CCE上传输,LTE中支持4中不同类型的PDCCH,如表1所示:
PDCCH格式 CCE数目 资源粒子组数目 PDCCH比特数
0 1 9 72
1 2 18 144
2 4 36 288
3 8 72 576
表1
LTE中CCE的编号和分配是连续的。如果系统分配了PCFICH和PHICH后剩余REG的数量为NREG,那么PDCCH可用的CCE的数目为NCCE=NREG/9向下取整。CCE的编号为从0开始到NCCE-1。PDCCH所占用的 CCE数目取决于UE所处的下行信道环境,对于下行信道环境好的UE,演进基站(evolved NodeB,eNodeB)可能只需分配一个CCE,对于下行信道环境较差的UE,eNodeB可能需要为之分配多达8个的CCE。为了简化UE在解码PDCCH时的复杂度,LTE中还规定CCE数目为N的PDCCH,其起始位置的CCE号,必须是N的整数倍。
UE在接收eNodeB发来的信息时,需要对每个子帧的所有PDCCH进行监控,检测其中是否包含有自身所需调度或控制信息,而监控时需要知道每个PDCCH所对应CCE(s)的放置位置。为了描述这些位置信息,即UE需要监测CCE候选集合的位置信息,LTE中定义了搜索空间这一概念,并将搜索空间分为公共搜索空间和UE专用搜索空间。UE监控的PDCCH候选如表2所示:
Figure PCTCN2016072504-appb-000001
表2
每个PDCCH中,包含16bit的循环冗余校验(Cyclic Redundancy Check,CRC),UE用来验证接收到的PDCCH是否正确,并且CRC使用和UE相关的身份(Identity)进行扰码,使得UE能够确定哪些PDCCH是自己需要接收的,哪些是发送给其他UE的。可以用来进行扰码的UE Identity即为随机接入无线网络临时标识(Random Access Radio Network Temporary,RNTI)。每个PDCCH,经过CRC校验后,进行咬尾卷积信道编码和速率匹配。eNodeB可以根据UE上报上来的信道质量指示(Channel Quality Indicator,CQI)进行速率匹配。此时,对于每个PDCCH,就可以确定其占用的CCE数目的大 小。
所述可用的CCE的编号是从0到NCCE-1。可以将CCE看作是逻辑的资源,顺序排列,为所有的PDCCH所共享。eNodeB根据每个PDCCH上CCE起始位置的限制,将每个PDCCH放置在合适的位置。这时可能出现有的CCE没有被占用的情况,标准中规定需要插入NIL(表示无值),NIL对应的RE上面的发送功率为0。
此后,CCE上的数据比特经过与小区物理ID相关的扰码,四相移相键控(Quaternary Phase Shift Keying,QPSK)调制,层映射和预编码,所得到的符号按照四元组为单位(Symbol Quadruplet,每个四元组映射到一个REG上)进行交织和循环移位,最后映射到相应的物理资源REG上去。
物理资源REG首先分配给PCFICH和PHICH,剩余的分配给PDCCH,按照先时域后频域的原则进行REG的映射。这样做的目的是为了避免PDCCH符号之间的不均衡。
目前的PDCCH盲检测方法是对于UE而言,该方法是通过已知的RNTI计算DCI信息的起始位置,然后对所有聚合等级遍历一次,应用RNTI对译码结果进行CRC验证,从而获取属于自己的DCI信息。在各用户RNTI未知的情况下,如果采用现有方法,需要对所有的RNTI(RNTI范围是1-65535)均计算一遍,对于现有的硬件水平来说,运算时间很相当长。
发明内容
本申请提供一种物理下行控制信道PDCCH盲检测方法和系统,以解决现有的PDCCH盲检测在RNTI未知的情况下需要相当长的运算时间确定RNTI的问题。
为了解决上述问题,本申请公开了一种物理下行控制信道PDCCH盲检测方法,包括:
获取PDCCH数据;
将所述PDCCH数据按照资源元素的位置标识进行分组,根据分组后的每组PDCCH数据得到软比特数据;
从所述软比特数据中获取控制信道单元软比特数据;
根据所述控制信道单元软比特数据确定下行链路控制信息DCI数据;
根据所述DCI数据获取得到随机接入无线网络临时标识,完成PDCCH盲检测。
相应地,本申请还公开了一种物理下行控制信道PDCCH盲检测系统,包括:
第一数据获取模块,设置为获取PDCCH数据;
第二数据获取模块,用于将所述PDCCH数据按照资源元素的位置标识进行分组,根据分组后的每组PDCCH数据得到软比特数据;
第三数据获取模块,用于从所述软比特数据中获取控制信道单元软比特数据;
DCI数据获取模块,用于根据所述控制信道单元软比特数据确定下行链路控制信息DCI数据;
无线网络临时标识获取模块,用于根据所述DCI数据获取得到随机接入无线网络临时标识,完成PDCCH盲检测。
与背景技术相比,本申请包括以下优点:
本申请技术方案是在各用户的RNTI是未知的,用户数也是未知的情况下的PDCCH盲检测。本申请根据咬尾卷积编码的特性,将接收到的PDCCH信息进行功率检测,然后将连续RE进行分组,对每组数据分别进行信道均衡、检测解调、解扰,根据不同的聚合等级取出数据,对所有可能的DCI格式进行解速率匹配和译码,根据卷积编码特性获得正确的DCI,最后取出译码后的CRC校验比特与译码后根据DCI计算得到的CRC校验比特进行异或计算,获得正确的RNTI。本申请技术方案适用于用户RNTI不确定的情况,可保证PDCCH盲检测的准确度,大大降低了计算量和计算时间。
附图说明
图1为本申请实施例一中的一种PDCCH盲检测方法的步骤流程图;
图2为本申请实施例二中的一种PDCCH盲检测方法的步骤流程图;
图3为本申请实施例三中的一种PDCCH盲检测方法的步骤流程图;
图4为本申请实施例四中的一种PDCCH盲检测方法的步骤流程图;
图5为本申请实施例五中的一种PDCCH盲检测系统的结构示意图;
图6为本申请实施例六中的一种PDCCH盲检测系统的结构示意图。
具体实施方式
为使本申请的上述目的、特征和优点能够更加明显易懂,下面结合附图和具体实施方式对本申请作进一步详细的说明。
本申请实施例提供了一种低复杂度的PDCCH盲检测方法,包括:根据解调译码PCFICH得到控制信道的OFDM符号个数,以及系统配置信息确定所有的PDCCH在一个子帧内占用的RE位置,通过功率检测,获取控制信道上有效的PDCCH数据;将PDCCH数据根据RE位置进行分组,对每组PDCCH数据分别进行信道均衡、解调、解扰,获取软比特;根据每组的PDCCH数据长度判断可能的聚合等级,根据不同的聚合等级和起始位置从软比特中取出数据;对取出的数据根据所有可能的DCI格式进行解速率匹配和译码,根据咬尾卷积编码特性获得正确的DCI;根据CRC校验比特获得正确的RNTI。
下面通过列举几个具体的实施例详细介绍本申请提供的一种PDCCH盲检测方法和系统。
实施例一
详细介绍本申请实施例提供的一种PDCCH盲检测方法。
参照图1,示出了本申请实施例中一种PDCCH盲检测方法的步骤流程图。
步骤100,根据译码PCFICH得到的PDCCH占用的OFDM符号个数N,以及系统配置信息确定所有的PDCCH在一个子帧内占用的RE位置,通过功率检测,获取控制信道上有效的PDCCH数据。
所述步骤100可以包括:
子步骤1001,根据译码PCFICH得到的PDCCH占用的OFDM符号个数N,在PDCCH所占用的N个符号中,除了PDCCH,还包含有PCFICH,PHICH,RS等内容。其中PCFICH的内容已经解调,PHICH的分布由PBCH确定,RS的分布取决于PBCH中广播的天线端口数目。因此,能够确定所有的PDCCH在一个子帧内占用的RE。
子步骤1002,对PDCCH占用的每个RE进行功率检测,设定功率门限PThreshold为导频信道功率PPilot减去无线链路功率容限Ladj,即PThreshold=PPliot-Ladj,计算每个RE的功率,将所述RE功率PRE与功率门限 进行比较,获取所有PRE>PThreshold的RE,并对所有RE进行位置标识。
当PRE>PThreshold时,RE_FLAG[n]=1(n=0,1,2…);
当PRE<PThreshold时,RE_FLAG[n]=0(n=0,1,2…);
其中,n是所有RE的个数,RE_FLAG[n]为对应的标识信息。
步骤102,将所述PDCCH数据根据RE位置进行分组,对每组数据分别进行信道均衡、解调、解扰,获取软比特。
优选地,所述步骤102可以包括:
子步骤1021,按照所述位置标识RE_FLAG[n]将所述RE进行分组,将位置标识RE_FLAG[n]连续为1的RE分为一组,设可分为N组,即Pdcch_all[n][k](其中,组数n=0,1,…,N-1;每组连续RE个数k=0,1,…,NRE-1),针对每一组数据分别进行计算。
子步骤1022,将所述每组数据Pdcch_all[n][k]分别进行信道均衡,QPSK解调,根据已知的物理小区ID进行解扰,获得软比特Soft_bits_all[nbit](其中nbit=2*NRE)。
步骤104,根据每组的数据长度判断可能的聚合等级,以数据头为起始位置,根据不同的聚合等级和起始位置从所述软比特中取出数据。
优选地,所述步骤104可以包括:
子步骤1041,根据所述每组连续RE个数NRE计算本组数据长度NREG,为NREG=NRE/4。
子步骤1042,根据每组数据长度NREG获得PDCCH可用的CCE的数目为NCCE=NREG/9向下取整,CCE的编号为从0开始到NCCE-1。
子步骤1043,根据表2所示公共搜索空间对应的聚合等级为Common_space=[8,4,2,1];UE专用搜索空间对应的聚合等级为UE_space=[8,4],因此所有可能的聚合等级为Search_space[i]=[8,4,2,1],(i=0,1,2,3)。将所述每组的CCE个数NCCE与所有可能的聚合等级进行比较。
如果NCCE<Search_space[i],则删除Search_space[i]=0。
子步骤1044,以数据头为起始位置,根据的子步骤1043计算得到的不同聚合等级Search_space_use[i],计算目前参与计算的CCE的起始位置cce_start_now。
子步骤1045,如表2所示,判断所述CCE组是否有已检测出DCI信 息的组,如果二者有交集则结束;如果二者完全没有交集,根据所述CCE的起始位置在步骤102中获取的软比特Soft_bits_all中取出数据。
Soft cce_bits[n]=Soft_bits_all[(cce_start_now-1)*72+1:(cce_start_now-1+Search_space_use[i])*72),(n=0,1,…,LSoft_cce_bits-1)。
所述数据Soft_cce_bits的长度为LSoft_cce_bits,并继续步骤106。
步骤106,对所述数据根据所有可能的DCI格式进行解速率匹配和译码,根据咬尾卷积编码特性,将译码后的数据进行卷积编码和速率匹配得到信息比特数据,对所述信息比特和译码前的数据进行比较,获得正确的DCI。
优选地,所述步骤106可以包括:
子步骤1061,根据3GPP TS 36.213协议,以及DCI格式与传输模式的对应关系,确定所有可能的DCI格式。
子步骤1062,根据3GPP协议TS 36.212所述,不同的DCI格式的长度由协议规定可计算得到;
子步骤1063,根据所有可能的DCI格式,对步骤S1035所述数据Soft_cce_bits进行解速率匹配和卷积译码,获得译码后的信息比特Decoded_bits[n],(n=0,1,2,…,LDecoded-1);
Decoded_bits[n]分为两部分,前半部分为DCI信息比特,即
DCI[i[=Decoded_bits[n],(i=n=0,1,…,LDcI-1),
后半部分为CRC校验比特,即
CRC[j]=Decoded_bits[n](j=0,1,…,LCRC-1;n=LDCI,…,LDecoded-1)。
其中,LDecoded=LCRC+LDCI;LCRC=16。
解速率匹配的步骤包括:比特接收,比特分离,子块解交织;卷积译码采用Viterbi概率译码算法。Viterbi译码算法考虑到信道的统计特性,计算接收码字和所有可能的栅格路径之间的距离,并挑选出和接收码字距离最近的栅格路径作为Viterbi译码输出。Viterbi译码是本领域研发人员公知的译码算法,此处不再赘述。
子步骤1064,取出译码后的信息比特Decoded_bits[n],(n=0,1,…, L Soft_cce_bits-1),对所述信息比特Decoded_bits[n]进行卷积编码和速率匹配,获得数据比特RateMatch_bits[n],(n=0,1,…,LSoft_cce_bits-1)。
根据咬尾卷积编码只有数据的起始位置完全准确时,才能够正确译码的特性,将所述译码前的软比特Soft_cce_bits[n]进行硬判决得到硬比特Hard_cce_bits[n],将所述硬比特和所述速率匹配后的数据比特RateMatch_bits[n]逐一进行比较。
若Hard_cce_bits[n]=RateMatch_bits[n],(n=0,1,…,LSoft_cce_bits-1),则对应的DCI格式为正确格式,根据所述DCI格式译码后的DCI信息比特DCI[i]即为正确DCI。继续步骤步骤108。
若Hard_cce_bits[n]≠RateMatch_bits[n],(n=0,1,…,LSoft_cee_bits-1),则对应的DCI格式为错误,则返回子步骤1044。
步骤108,根据CRC校验比特,取出译码后的CRC校验比特与译码后根据DCI信息计算CRC校验比特进行异或计算,获得正确的RNTI。
优选地,所述步骤108可以包括:
子步骤1081,根据译码后的比特数据Decoded_bits[n],以及3GPP TS 36.212协议5.1.1中算法,计算获得CRC校验比特,CRC_bits[n],(n=0,1,…,LCRC-1)。
子步骤1082,将子步骤1063译码得到的CRC比特CRC[n]与子步骤1081计算得到的CRC校验比特CRC_bits[n]进行异或计算,获得正确的RNTI,即
RNTI[n]=XOR(CRC[n],CRC_bits[n]),(n=0,1,…,LCRC-1)。
综上所述,本申请实施例技术方案是在各用户的RNTI是未知的,用户数也是未知的情况下的PDCCH盲检测。本申请根据咬尾卷积编码的特性,将接收到的PDCCH信息进行功率检测,然后将连续RE进行分组,对每组数据分别进行信道均衡、检测解调、解扰,根据不同的聚合等级取出数据,对所有可能的DCI格式进行解速率匹配和译码,根据卷积编码特性获得正确的DCI,最后取出译码后的CRC校验比特与译码后根据DCI计算得到的CRC校验比特进行异或计算,获得正确的RNTI。本申请技术方案适用于用户RNTI不确定的情况,可保证PDCCH盲检测的准确度, 大大降低了计算量和计算时间。
实施例二
详细介绍本申请实施例提供的一种PDCCH盲检测方法。
参照图2,示出了本申请实施例中一种PDCCH盲检测方法的步骤流程图。
步骤200,取出所有控制信道上的PDCCH数据。
步骤202,判断RE的功率PRE是否大于功率门限Plim;若大于,执行步骤204。
步骤204,将有数据的连续RE分为一组,设可分为N组,针对每一组数据分别进行计算。
步骤206,对每组RE进行信道均衡、检测解调和解扰。
步骤208,根据组内的数据长度,判断可能的聚合等级。
步骤210,以数据头为起始位置,根据不同的聚合等级取出数据。
步骤212,根据不同的DCI类型,分别进行接速率匹配和卷积译码。
步骤214,取出译码后的信息比特,并对其进行卷积编码和速率匹配。
步骤216,比较译码前的信息比特于卷积编码后的信息比特是否相等;若相等,则执行步骤218;若不相等,则执行步骤222。
步骤218,计算得到的CRC校验比特与译码后的校验比特异或获得RNTI。
步骤220,将已检测出DCI信息的CCE清零,跳出DCI类型检测循环。
步骤222,判断DCI类型检测是否完毕;若未完毕,则执行步骤212;若完毕,则执行步骤224。
步骤224,判断是否遍历所有聚合等级;若是,则执行步骤226;若否,则执行步骤210。
步骤226,判断是否分析完所有数据;若是,则盲检测结束;若否,则执行步骤204。
综上所述,本申请实施例技术方案是在各用户的RNTI是未知的,用 户数也是未知的情况下的PDCCH盲检测。本申请根据咬尾卷积编码的特性,将接收到的PDCCH信息进行功率检测,然后将连续RE进行分组,对每组数据分别进行信道均衡、检测解调、解扰,根据不同的聚合等级取出数据,对所有可能的DCI格式进行解速率匹配和译码,根据卷积编码特性获得正确的DCI,最后取出译码后的CRC校验比特与译码后根据DCI计算得到的CRC校验比特进行异或计算,获得正确的RNTI。本申请技术方案适用于用户RNTI不确定的情况,可保证PDCCH盲检测的准确度,大大降低了计算量和计算时间。
实施例三
详细介绍本申请实施例提供的一种PDCCH盲检测方法。
参照图3,示出了本申请实施例中一种PDCCH盲检测方法的步骤流程图。
步骤300,获取PDCCH数据。
根据译码PCFICH得到的PDCCH占用的OFDM符号个数N,以及系统配置信息确定所有的PDCCH在一个子帧内占用的RE位置,通过对RE的功率进行检测和比较,获取控制信道上有效的PDCCH数据。
步骤302,将所述PDCCH数据按照资源元素的位置标识进行分组,根据分组后的每组PDCCH数据得到软比特数据。
将位置标识RE_FLAG[n]连续为1的RE分为一组,设可分为N组,即Pdcch_all[n][k](其中,组数n=0,1,…,N-1;每组连续RE个数k=0,1,…,NRE-1)。
步骤304,从所述软比特数据中获取控制信道单元软比特数据。
根据每组的数据长度判断可能的聚合等级,以数据头为起始位置,根据不同的聚合等级和起始位置从所述软比特数据中取出控制信道单元软比特数据。
步骤306,根据所述控制信道单元软比特数据确定下行链路控制信息DCI数据。
对所述控制信道单元软比特数据根据所有可能的DCI格式进行解速率匹配和译码,根据咬尾卷积编码特性,将译码后的数据进行卷积编码和 速率匹配得到信息比特数据,对所述信息比特和译码前的数据进行比较,获得正确的DCI。
步骤308,根据所述DCI数据获取得到随机接入无线网络临时标识,完成PDCCH盲检测。
根据CRC校验比特,取出译码后的CRC校验比特与译码后根据DCI信息计算CRC校验比特进行异或计算,获得正确的RNTI。
综上所述,本申请实施例技术方案是在各用户的RNTI是未知的,用户数也是未知的情况下的PDCCH盲检测。本申请根据咬尾卷积编码的特性,将接收到的PDCCH信息进行功率检测,然后将连续RE进行分组,对每组数据分别进行信道均衡、检测解调、解扰,根据不同的聚合等级取出数据,对所有可能的DCI格式进行解速率匹配和译码,根据卷积编码特性获得正确的DCI,最后取出译码后的CRC校验比特与译码后根据DCI计算得到的CRC校验比特进行异或计算,获得正确的RNTI。本申请技术方案适用于用户RNTI不确定的情况,可保证PDCCH盲检测的准确度,大大降低了计算量和计算时间。
实施例四
详细介绍本申请实施例提供的一种PDCCH盲检测方法。
参照图4,示出了本申请实施例中一种PDCCH盲检测方法的步骤流程图。
步骤400,获取PDCCH数据。
根据译码PCFICH得到的PDCCH占用的OFDM符号个数N,以及系统配置信息确定所有的PDCCH在一个子帧内占用的RE位置,通过对RE的功率进行检测和比较,获取控制信道上有效的PDCCH数据。
优选地,所述步骤400可以包括:
子步骤4001,根据译码物理控制格式指示信道PCFICH得到的PDCCH占用的正交频分多址OFDM符号的数量以及预设的系统配置信息,确定PDCCH在一个子帧内占用的资源元素。
子步骤4002,对所述资源元素进行功率检测,获取功率大于设定的功 率门限的资源元素对应的PDCCH数据。
步骤402,将所述PDCCH数据按照资源元素的位置标识进行分组,根据分组后的每组PDCCH数据得到软比特数据。
将位置标识RE_FLAG[n]连续为1的RE分为一组,设可分为N组,即Pdcch_all[n][k](其中,组数n=0,1,…,N-1;每组连续RE个数k=0,1,…,NRE-1)。
优选地,所述步骤402可以包括:
子步骤4021,将位置标识连续的资源元素对应的PDCCH数据分为同一组。
子步骤4022,对分组后的每一组PDCCH数据分别进行信道均衡、解调和解扰操作,得到软比特数据。
步骤404,从所述软比特数据中获取控制信道单元软比特数据。
根据每组的数据长度判断可能的聚合等级,以数据头为起始位置,根据不同的聚合等级和起始位置从所述软比特数据中取出控制信道单元软比特数据。
优选地,所述步骤404可以包括:
子步骤4041,根据公共搜索空间和用户设备专用搜索空间对应的聚合等级确定所述软比特数据的聚合等级。
子步骤4042,从所述软比特数据的数据头开始,根据所述软比特数据的聚合等级获取控制信道单元软比特数据。
步骤406,根据所述控制信道单元软比特数据确定下行链路控制信息DCI数据。
对所述控制信道单元软比特数据根据所有可能的DCI格式进行解速率匹配和译码,根据咬尾卷积编码特性,将译码后的数据进行卷积编码和速率匹配得到信息比特数据,对所述信息比特和译码前的数据进行比较,获得正确的DCI。
优选地,所述步骤406可以包括:
子步骤4061,确定所述PDCCH中承载的下行链路控制信息DCI的格式。
子步骤4062,根据所述DCI的格式对所述控制信道单元软比特数据 进行解速率匹配和卷积译码得到译码比特数据。
子步骤4063,对所述译码比特数据进行卷积编码和速率匹配得到速率匹配比特数据。
子步骤4064,对所述控制信道单元软比特数据进行硬判决得到控制信道单元硬比特数据。
子步骤4065,判断所述速率匹配比特数据和所述控制信道单元硬比特数据是否相同;若相同,则执行子步骤4066;若不同,流程结束。
子步骤4066,确定所述译码比特数据为DCI数据。
其中,所述DCI数据包括DCI比特数据和第一循环冗余校验CRC比特数据。
步骤408,根据所述DCI数据获取得到随机接入无线网络临时标识,完成PDCCH盲检测。
根据CRC校验比特,取出译码后的CRC校验比特与译码后根据DCI信息计算CRC校验比特进行异或计算,获得正确的RNTI。
优选地,所述步骤408可以包括:
子步骤4081,根据所述DCI数据计算得到第二CRC比特数据。
子步骤4082,将所述计算得到的第二CRC比特数据与所述DCI数据中的第一CRC比特数据进行异或计算得到随机接入无线网络临时标识。
综上所述,本申请实施例技术方案是在各用户的RNTI是未知的,用户数也是未知的情况下的PDCCH盲检测。本申请根据咬尾卷积编码的特性,将接收到的PDCCH信息进行功率检测,然后将连续RE进行分组,对每组数据分别进行信道均衡、检测解调、解扰,根据不同的聚合等级取出数据,对所有可能的DCI格式进行解速率匹配和译码,根据卷积编码特性获得正确的DCI,最后取出译码后的CRC校验比特与译码后根据DCI计算得到的CRC校验比特进行异或计算,获得正确的RNTI。本申请技术方案适用于用户RNTI不确定的情况,可保证PDCCH盲检测的准确度,大大降低了计算量和计算时间。
实施例五
详细介绍本申请实施例提供的一种PDCCH盲检测系统。
参照图5,示出了本申请实施例中一种PDCCH盲检测系统的结构示意图。
所述系统可以包括:第一数据获取模块500,第二数据获取模块502,第三数据获取模块504,DCI数据获取模块506,无线网络临时标识获取模块508。
下面分别详细介绍各模块的功能以及各模块之间的关系。
第一数据获取模块500,设置为获取PDCCH数据。
第二数据获取模块502,设置为将所述PDCCH数据按照资源元素的位置标识进行分组,根据分组后的每组PDCCH数据得到软比特数据。
第三数据获取模块504,设置为从所述软比特数据中获取控制信道单元软比特数据。
DCI数据获取模块506,设置为根据所述控制信道单元软比特数据确定下行链路控制信息DCI数据。
无线网络临时标识获取模块508,设置为根据所述DCI数据获取得到随机接入无线网络临时标识,完成PDCCH盲检测。
综上所述,本申请实施例技术方案是在各用户的RNTI是未知的,用户数也是未知的情况下的PDCCH盲检测。本申请根据咬尾卷积编码的特性,将接收到的PDCCH信息进行功率检测,然后将连续RE进行分组,对每组数据分别进行信道均衡、检测解调、解扰,根据不同的聚合等级取出数据,对所有可能的DCI格式进行解速率匹配和译码,根据卷积编码特性获得正确的DCI,最后取出译码后的CRC校验比特与译码后根据DCI计算得到的CRC校验比特进行异或计算,获得正确的RNTI。本申请技术方案适用于用户RNTI不确定的情况,可保证PDCCH盲检测的准确度,大大降低了计算量和计算时间。
实施例六
详细介绍本申请实施例提供的一种PDCCH盲检测系统。
参照图6,示出了本申请实施例中一种PDCCH盲检测系统的结构示 意图。
所述系统可以包括:第一数据获取模块600,第二数据获取模块602,第三数据获取模块604,DCI数据获取模块606,无线网络临时标识获取模块608。
其中,所述第一数据获取模块600可以包括:资源元素确定模块6001,PDCCH数据获取模块6002。
所述第二数据获取模块602可以包括:分组模块6021,软比特数据获取模块6022。
所述第三数据获取模块604可以包括:聚合等级确定模块6041,控制信道单元软比特数据获取模块6042。
所述DCI数据获取模块606可以包括:DCI格式确定子模块6061,译码比特数据获取子模块6062,速率匹配比特数据获取子模块6063,控制信道单元硬比特数据获取子模块6064,判断子模块6065,DCI数据确定子模块6066。
所述无线网络临时标识获取模块608可以包括:计算模块6081,异或模块6082。
下面分别详细介绍各模块、各子模块的功能以及各模块、各子模块之间的关系。
第一数据获取模块600,设置为获取PDCCH数据。
优选地,所述第一数据获取模块600可以包括:
资源元素确定模块6001,设置为根据译码物理控制格式指示信道PCFICH得到的PDCCH占用的正交频分多址OFDM符号的数量以及预设的系统配置信息,确定PDCCH在一个子帧内占用的资源元素。
PDCCH数据获取模块6002,设置为对所述资源元素进行功率检测,获取功率大于设定的功率门限的资源元素对应的PDCCH数据。
第二数据获取模块602,设置为将所述PDCCH数据按照资源元素的位置标识进行分组,根据分组后的每组PDCCH数据得到软比特数据。
优选地,所述第二数据获取模块602可以包括:
分组模块6021,设置为将位置标识连续的资源元素对应的PDCCH数 据分为同一组。
软比特数据获取子模块6022,设置为用于对分组后的每一组PDCCH数据分别进行信道均衡、解调和解扰操作,得到软比特数据。
第三数据获取模块604,设置为从所述软比特数据中获取控制信道单元软比特数据。
优选地,所述第三数据获取模块604可以包括:
聚合等级确定模块6041,设置为根据公共搜索空间和用户设备专用搜索空间对应的聚合等级确定所述软比特数据的聚合等级。
控制信道单元软比特数据获取模块6042,设置为从所述软比特数据的数据头开始,根据所述软比特数据的聚合等级获取控制信道单元软比特数据。
DCI数据获取模块606,设置为根据所述控制信道单元软比特数据确定下行链路控制信息DCI数据。
优选地,所述DCI数据获取模块606可以包括:
DCI格式确定模块6061,设置为确定所述PDCCH中承载的下行链路控制信息DCI的格式。
译码比特数据获取模块6062,设置为根据所述DCI的格式对所述控制信道单元软比特数据进行解速率匹配和卷积译码得到译码比特数据。
速率匹配比特数据获取模块6063,设置为对所述译码比特数据进行卷积编码和速率匹配得到速率匹配比特数据。
控制信道单元硬比特数据获取模块6064,设置为对所述控制信道单元软比特数据进行硬判决得到控制信道单元硬比特数据。
判断子模块6065,设置为判断所述速率匹配比特数据和所述控制信道单元硬比特数据是否相同。
DCI数据确定子模块6066,设置为当所述速率匹配比特数据和所述控制信道单元硬比特数据相同时,确定所述译码比特数据为DCI数据。
其中,所述DCI数据包括DCI比特数据和第一循环冗余校验CRC比特数据。
无线网络临时标识获取模块608,设置为根据所述DCI数据获取得到随机接入无线网络临时标识,完成PDCCH盲检测。
优选地,所述无线网络临时标识获取模块608可以包括:
计算模块6081,设置为根据所述DCI数据计算得到第二CRC比特数据。
异或模块6082,设置为将所述计算得到的第二CRC比特数据与所述DCI数据中的第一CRC比特数据进行异或计算得到随机接入无线网络临时标识。
综上所述,本申请实施例技术方案是在各用户的RNTI是未知的,用户数也是未知的情况下的PDCCH盲检测。本申请根据咬尾卷积编码的特性,将接收到的PDCCH信息进行功率检测,然后将连续RE进行分组,对每组数据分别进行信道均衡、检测解调、解扰,根据不同的聚合等级取出数据,对所有可能的DCI格式进行解速率匹配和译码,根据卷积编码特性获得正确的DCI,最后取出译码后的CRC校验比特与译码后根据DCI计算得到的CRC校验比特进行异或计算,获得正确的RNTI。本申请技术方案适用于用户RNTI不确定的情况,可保证PDCCH盲检测的准确度,大大降低了计算量和计算时间。
所述计算机可读记录介质包括用于以计算机(例如计算机)可读的形式存储或传送信息的任何机制。例如,机器可读介质包括只读存储器(ROM)、随机存取存储器(RAM)、磁盘存储介质、光存储介质、闪速存储介质、电、光、声或其他形式的传播信号(例如,载波、红外信号、数字信号等)等。
对于系统实施例而言,由于其与方法实施例基本相似,所以描述的比较简单,相关之处参见方法实施例的部分说明即可。
本说明书中的各个实施例均采用递进的方式描述,每个实施例重点说明的都是与其他实施例的不同之处,各个实施例之间相同相似的部分互相参见即可。
本领域普通技术人员可以理解:实现上述方法实施例的全部或部分步骤可以通过程序指令相关的硬件来完成,前述的程序可以存储于一计算机可读 取存储介质中,该程序在执行时,执行包括上述方法实施例的步骤;而前述的存储介质包括:ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
最后应说明的是:以上各实施例仅用以说明本申请的技术方案,而非对其限制;尽管参照前述各实施例对本申请进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分或者全部技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本申请各实施例技术方案的范围。

Claims (13)

  1. 一种物理下行控制信道PDCCH盲检测方法,其特征在于,包括:
    获取PDCCH数据;
    将所述PDCCH数据按照资源元素的位置标识进行分组,根据分组后的每组PDCCH数据得到软比特数据;
    从所述软比特数据中获取控制信道单元软比特数据;
    根据所述控制信道单元软比特数据确定下行链路控制信息DCI数据;
    根据所述DCI数据获取得到随机接入无线网络临时标识,完成PDCCH盲检测。
  2. 根据权利要求1所述的方法,其特征在于,所述获取PDCCH数据,包括:
    根据译码物理控制格式指示信道PCFICH得到的PDCCH占用的正交频分多址OFDM符号的数量以及预设的系统配置信息,确定PDCCH在一个子帧内占用的资源元素;
    对所述资源元素进行功率检测,获取功率大于设定的功率门限的资源元素对应的PDCCH数据。
  3. 根据权利要求1或2所述的方法,其特征在于,所述将所述PDCCH数据按照资源元素的位置标识进行分组,根据分组后的每组PDCCH数据得到软比特数据,包括:
    将位置标识连续的资源元素对应的PDCCH数据分为同一组;
    对分组后的每一组PDCCH数据分别进行信道均衡、解调和解扰操作,得到软比特数据。
  4. 根据权利要求1所述的方法,其特征在于,所述从所述软比特数据中获取控制信道单元软比特数据,包括:
    根据公共搜索空间和用户设备专用搜索空间对应的聚合等级确定所述软比特数据的聚合等级;
    从所述软比特数据的数据头开始,根据所述软比特数据的聚合等级获取控制信道单元软比特数据。
  5. 根据权利要求1所述的方法,其特征在于,所述根据所述控制信道单元软比特数据确定下行链路控制信息DCI数据,包括:
    确定所述PDCCH中承载的下行链路控制信息DCI的格式;
    根据所述DCI的格式对所述控制信道单元软比特数据进行解速率匹配和卷积译码得到译码比特数据;
    对所述译码比特数据进行卷积编码和速率匹配得到速率匹配比特数据;
    对所述控制信道单元软比特数据进行硬判决得到控制信道单元硬比特数据;
    判断所述速率匹配比特数据和所述控制信道单元硬比特数据是否相同;
    若相同,则确定所述译码比特数据为DCI数据;
    其中,所述DCI数据包括DCI比特数据和第一循环冗余校验CRC比特数据。
  6. 根据权利要求5所述的方法,其特征在于,所述根据所述DCI数据获取得到随机接入无线网络临时标识,包括:
    根据所述DCI数据计算得到第二CRC比特数据;
    将所述计算得到的第二CRC比特数据与所述DCI数据中的第一CRC比特数据进行异或计算得到随机接入无线网络临时标识。
  7. 一种物理下行控制信道PDCCH盲检测系统,其特征在于,包括:
    第一数据获取模块,设置为获取PDCCH数据;
    第二数据获取模块,设置为将所述PDCCH数据按照资源元素的位置标识进行分组,根据分组后的每组PDCCH数据得到软比特数据;
    第三数据获取模块,设置为从所述软比特数据中获取控制信道单元软比特数据;
    DCI数据获取模块,设置为根据所述控制信道单元软比特数据确定下行链路控制信息DCI数据;
    无线网络临时标识获取模块,设置为根据所述DCI数据获取得到随机接入无线网络临时标识,完成PDCCH盲检测。
  8. 根据权利要求7所述的系统,其特征在于,所述第一数据获取模块,包括:
    资源元素确定模块,设置为根据译码物理控制格式指示信道PCFICH得到的PDCCH占用的正交频分多址OFDM符号的数量以及预设的系统配置信 息,确定PDCCH在一个子帧内占用的资源元素;
    PDCCH数据获取模块,设置为对所述资源元素进行功率检测,获取功率大于设定的功率门限的资源元素对应的PDCCH数据。
  9. 根据权利要求7或8所述的系统,其特征在于,所述第二数据获取模块,包括:
    分组模块,设置为将位置标识连续的资源元素对应的PDCCH数据分为同一组;
    软比特数据获取模块,设置为对分组后的每一组PDCCH数据分别进行信道均衡、解调和解扰操作,得到软比特数据。
  10. 根据权利要求7所述的系统,其特征在于,所述第三数据获取模块,包括:
    聚合等级确定模块,设置为根据公共搜索空间和用户设备专用搜索空间对应的聚合等级确定所述软比特数据的聚合等级;
    控制信道单元软比特数据获取模块,设置为从所述软比特数据的数据头开始,根据所述软比特数据的聚合等级获取控制信道单元软比特数据。
  11. 根据权利要求7所述的系统,其特征在于,所述DCI数据获取模块,包括:
    DCI格式确定模块,设置为确定所述PDCCH中承载的下行链路控制信息DCI的格式;
    译码比特数据获取模块,设置为根据所述DCI的格式对所述控制信道单元软比特数据进行解速率匹配和卷积译码得到译码比特数据;
    速率匹配比特数据获取模块,设置为对所述译码比特数据进行卷积编码和速率匹配得到速率匹配比特数据;
    控制信道单元硬比特数据获取模块,设置为对所述控制信道单元软比特数据进行硬判决得到控制信道单元硬比特数据;
    判断模块,设置为判断所述速率匹配比特数据和所述控制信道单元硬比特数据是否相同;
    DCI数据确定模块,设置为当所述速率匹配比特数据和所述控制信道单元硬比特数据相同时,确定所述译码比特数据为DCI数据;
    其中,所述DCI数据包括DCI比特数据和第一循环冗余校验CRC比特 数据。
  12. 根据权利要求11所述的系统,其特征在于,所述无线网络临时标识获取模块,包括:
    计算模块,设置为根据所述DCI数据计算得到第二CRC比特数据;
    异或模块,设置为将所述计算得到的第二CRC比特数据与所述DCI数据中的第一CRC比特数据进行异或计算得到随机接入无线网络临时标识。
  13. 一种在其上记录有用于执行权利要求1所述方法的程序的计算机可读记录介质。
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