WO2012146095A1 - Procédé et système pour transmettre des données de contrôle sur la liaison descendante - Google Patents

Procédé et système pour transmettre des données de contrôle sur la liaison descendante Download PDF

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Publication number
WO2012146095A1
WO2012146095A1 PCT/CN2012/072556 CN2012072556W WO2012146095A1 WO 2012146095 A1 WO2012146095 A1 WO 2012146095A1 CN 2012072556 W CN2012072556 W CN 2012072556W WO 2012146095 A1 WO2012146095 A1 WO 2012146095A1
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Prior art keywords
pdcch
information
downlink control
primary
control information
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PCT/CN2012/072556
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English (en)
Chinese (zh)
Inventor
吴欣
戴博
左志松
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中兴通讯股份有限公司
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Publication of WO2012146095A1 publication Critical patent/WO2012146095A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • a radio frame in a Long Term Evolution (LTE) system includes a Frequency Division Duplex (FDD) mode and a Time Division Duplex (TDD).
  • FDD mode frame structure as shown in Figure 1, a 10 millisecond (ms) radio frame consists of twenty slots of length 0.5ms, numbered 0 ⁇ 19, and slots 2i and 2i+l Sub frame i of length lms.
  • the frame structure of the TDD mode as shown in FIG.
  • a 10 ms radio frame is composed of two half frames of 5 ms length, one field includes five subframes of length lms, and subframe i is defined as 2 time slots 2i and 2i+1 which are 0.5 ms long.
  • one slot contains seven symbols with a length of 66.7 microseconds (us), and the CP of the first symbol has a length of 5.21. Us, the length of the remaining 6 symbols is 4.69 us; for Extended Cyclic Prefix (abbreviated as Extended CP), one slot contains 6 symbols, and the CP length of all symbols is 16.67 us.
  • the version number of LTE corresponds to R8 (Release 8), and the version number corresponding to the added version is R9 (Release 9), and for future LTE-Advance, the version number is R10 (Release 10).
  • the following three types of downlink physical control channels are defined in LTE: Physical Control Format Indicator Channel (PCFICH); Physical Hybrid Automatic Retransmission Request Indicator Channel (PHICH) ); physical downlink control channel (Physical Downlink Control Channel, PDCCH for short).
  • PCFICH Physical Control Format Indicator Channel
  • PHICH Physical Hybrid Automatic Retransmission Request Indicator Channel
  • PDCCH Physical Downlink Control Channel
  • the information carried by the PCFICH is used to indicate the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols of the PDCCH transmitted in one subframe, and is sent on the first OFDM symbol of the subframe.
  • the frequency location is determined by the system downlink bandwidth and the cell identity (ID).
  • the PHICH is used to carry acknowledgement/negative acknowledgement (ACK/NACK) feedback information for uplink transmission data.
  • the number of PHICHs and the time-frequency position can be determined by the system message and the cell ID in the Physical Broadcast Channel (PBCH) of the downlink carrier where the PHICH is located.
  • the PDCCH is used to carry downlink control information (Downlink Control Information, DCI for short), and includes: uplink and downlink scheduling information, and uplink power control information.
  • DCI format (DCI format) is divided into the following types: DCI format 0, DCI format 1, DCI format 1A, DCI format 1B, DCI format 1C, DCI format 1D, DCI format 2, DCI format 2A, DCI format 3, and DCI Format 3 A, etc.;
  • the DCI format 0 is used to indicate the scheduling of the Physical Uplink Shared Channel (PUSCH);
  • DCI format 1, DCI format 1A, DCI format 1B, DCI format 1C, DCI format ID are used for different modes of PDSCH codeword scheduling;
  • DCI format 2, DCI format 2A, DCI format 2B are used for different modes of space division multiplexing ;
  • DCI format 3A is used for different modes of the power control command of the physical uplink control channel (Physical Uplink Control Channel, abbreviated as PUCCH) and PUSCH.
  • the physical resources of the physical downlink control channel (PDCCH) are transmitted in units of Control Channel Elements (CCEs).
  • CCEs Control Channel Elements
  • the size of one CCE is 9 Resource Element Groups (REGs), that is, 36. Resource Element, one PDCCH may occupy 1, 2, 4 or 8 CCEs.
  • a tree-like aggregation (Aggregation) is adopted, that is, a PDCCH occupying one CCE can start from an arbitrary CCE position; a PDCCH occupying two CCEs from an even CCE The position starts; the PDCCH occupying 4 CCEs starts from the CCE position which is an integer multiple of 4; the PDCCH occupying 8 CCEs starts from the CCE position which is an integral multiple of 8.
  • Each aggregation level defines a search space (Search space), including public
  • the control domain carrying the PDCCH consists of a set of N ee numbers 0 to N eeE - l
  • the UE should detect a group of candidate PDCCHs in each non-discontinuous reception (non-DRX) subframe to obtain control information, and the detection refers to performing PDCCH in the group according to all DCI formats to be detected. decoding.
  • the candidate PDCCH (PDCCH candidate) to be detected is defined in the manner of search space, and the aggregation level J e ⁇ 1, 2, 4, 8 ⁇ , the search space " Defined by a set of candidate PDCCHs (PDCCH candidates).
  • Y k 0, J takes 4 and 8.
  • UE-specific search space UE-specific search space J takes 1 2 4 and 8).
  • Y k (AY k _,) oAD ⁇
  • ⁇ " s is the slot number in a radio frame.
  • w is the corresponding RNTI (Radio Network Temporary Identifier).
  • the UE should detect one common search space with an aggregation level of 4 and P 8, and one UE-specific search space with an aggregation level of 1 2 4 8 , and the common search space and the UE-specific search space may overlap.
  • the specific number of detections and the corresponding search space are shown in Table 1: Table 1
  • the UE is semi-statically set by higher layer signaling to be based on one of the following transmission modes.
  • Mode 1 Single-antenna port; port 0
  • Mode 2 Transmit diversity
  • Mode 3 Open-loop spatial multiplexing
  • Mode 4 Closed-loop spatial multiplexing ( Closed-loop spatial multiplexing)
  • Mode 5 Multi-user MIMO
  • Mode 7 Single antenna port; Port 5 ( Single -antenna port; port 5)
  • C-RNTI Cellular Network Temporary Identifier
  • CRC Cyclic Redundancy Check
  • DCI format 1 A single antenna port, port 0
  • DCI format 2A open loop spatial multiplexing or transmission diversity
  • DCI format 2 closed-loop spatial multiplexing or transmission diversity
  • DCI format 2B port 7 and port 8 (port 7 and 8); or specific
  • LTE-A Advanced Long Term Evolution
  • Carrier Aggregation carrier aggregation
  • the original physical downlink control channel PDCCH resources will not be sufficient to meet the new version requirements.
  • the macro base station due to strong interference of different base station types, the macro base station (Macro eNodeB) interferes with the micro base station (Pico) and the home base station (Home eNodeB) pairs the macro base station. (Macro eNodeB) Interference problems need to be well resolved. Therefore, opening up a new PDCCH resource will be an effective solution for solving the above problem.
  • there is no accurate scheme and definition for how to determine the above new PDCCH resources which brings inconvenience to practical applications.
  • the present invention provides a method and system for transmitting downlink control information, so as to at least solve the problem that the original physical downlink control channel PDCCH resource will not be sufficient to meet the new version requirement due to the increased demand for user access in the related art.
  • a method of transmitting downlink control information is provided.
  • the method for transmitting downlink control information according to the present invention is applied to an LTE-A system, including: a base station transmitting downlink control information to a UE by using a PDCCH in a subframe; where the PDCCH includes: a primary PDCCH and a secondary PDCCH, where the base station is in the first time Sending information of the primary PDCCH at the frequency position, the base station transmitting information from the PDCCH at the second time-frequency position, the information of the primary PDCCH includes indication information for indicating the PDCCH, and the information of the PDCCH includes scheduling for physical uplink and/or Scheduling information of the downlink shared channel.
  • the first time-frequency position corresponding to the primary PDCCH of the subframe is: a first area of the first time slot of the subframe, or a first area of the first time slot of the subframe, where the first time
  • the downlink control information sent by the frequency location is the downlink control information configured for the subframe; or the first time-frequency location corresponding to the primary PDCCH of the subframe is: the second time slot of the subframe, where the first time-frequency location is sent.
  • the downlink control information is the downlink control information configured for the next subframe; the second time-frequency location corresponding to the PDCCH from the subframe is: the first region of the first slot of the subframe, or the first of the subframe a second area of the time slot, or a second time slot of the subframe, or a second area and a second time slot of the first time slot of the subframe, wherein the downlink control of the second time-frequency position transmission
  • the information is the downlink control information configured for the subframe; or the second time-frequency position corresponding to the PDCCH from the subframe is: the second time slot of the subframe, where the downlink control information sent by the second time-frequency location is configured Downstream control information for the next subframe
  • the first area of the first time slot is the area in which the PDCCH configured by the base station is located in the first time slot; the second area of the first time slot is the PDSCH of the base station configured in the first time slot.
  • the indication information includes at least one of the following: location information occupied by the PDCCH; a modulation and coding scheme from the PDCCH; a transmission mode from the PDCCH; a load size from the PDCCH; and a demodulation reference signal DMRS antenna port number from the PDCCH.
  • the UE determines the first time-frequency location and the second time-frequency location according to a predefined manner; or the UE determines the first time-frequency location and the second time-frequency location by using the received high-layer signaling.
  • the indication information used to indicate the PDCCH from the PDCCH includes: the primary PDCCH indicates scheduling information from the PDCCH on one serving cell or multiple serving cells; scheduling for scheduling physical uplink and/or downlink shared channels The information includes: indicating, from the PDCCH, scheduling information of a PDSCH and/or a PUSCH on one serving cell or multiple serving cells.
  • the method before the transmitting, by the base station, the information about the PDCCH from the PDCCH, the method further includes: co-coding the downlink control information included in the PDCCH corresponding to all or part of the serving cells, where the joint coding is to perform multiple downlinks
  • the control information format is combined into one or more downlink control information formats.
  • the foregoing jointly coding the downlink control information included in the PDCCH corresponding to all or part of the serving cells includes one of the following: jointly coding the uplink grant information included in the PDCCH corresponding to all or part of the serving cells, and all or The downlink grant information included in the PDCCH corresponding to the part of the serving cell is jointly encoded; and the uplink grant information and the downlink grant information included in the PDCCH corresponding to all or part of the serving cell are jointly encoded.
  • the method further includes: jointly coding, by using the downlink control information included in the primary PDCCH corresponding to all or part of the serving cells, where the joint coding is more
  • the downlink control information formats are combined into one or more downlink control information formats.
  • jointly coding the downlink control information included in the primary PDCCH corresponding to all or part of the serving cell includes one of the following: the primary PDCCH corresponding to all or part of the serving cells, used to indicate the downlink of the uplink grant information from the PDCCH
  • the control information is jointly coded, and the primary PDCCH corresponding to all or part of the serving cells is used for jointly coding downlink control information indicating downlink grant information in the PDCCH; and the primary PDCCH corresponding to all or part of the serving cells is used.
  • Co-coding is performed together with downlink control information indicating uplink grant information and downlink grant information from the PDCCH.
  • the downlink control information included in the primary PDCCH includes at least one of the following: location information occupied by the primary PDCCH; modulation coding mode of the primary PDCCH; transmission mode of the primary PDCCH; load size of the primary PDCCH; demodulation reference of the primary PDCCH Signal DMRS antenna port number; DMRS scrambling code identifier of the primary PDCCH; DMRS layer number identifier of the primary PDCCH; carrier indication identifier of the primary PDCCH; aggregation level of the primary PDCCH; where the location information includes at least one of the following: The slot position information; the location information of the CCE from the control channel element where the PDCCH is located; and the PRB index from which the PDCCH is located.
  • the method further includes: the UE detecting the primary PDCCH; the UE acquiring the indication information of the PDCCH from the primary PDCCH; and acquiring, by the UE, the uplink of all or part of the serving cell according to the indication information. And/or scheduling information of the downlink shared channel.
  • the UE detects the primary PDCCH by one of the following: the UE detects the downlink control information format of the two load sizes on the PDCCH time-frequency position configured by the base station according to the transmission mode information configured by the base station; a downlink control information format of the scheduling information payload size of the PDCCH, or a downlink control information format of the UE that detects the scheduling information payload size from the PDCCH 1 and the PDCCH 2, where the scheduling information load size from the PDCCH, the PDCCH 1 and the PDCCH 2 is used Defined way or high The mode of the layer signaling is determined, the number of the candidate PDCCHs of the aggregation level detected by the UE is kept unchanged by a predetermined number; the UE acquires the information of the PDCCH according to the notification of the high layer signaling, where the PDCCH 1 is used to indicate the physical downlink shared channel scheduling information.
  • the PDCCH 2 is used to indicate physical uplink shared channel scheduling information, and the PDCCH 2 is used to indicate physical uplink shared channel scheduling information, and the PDCCH 2 is used to indicate physical downlink shared channel scheduling information.
  • the public search space includes the first 16 control channel elements of the first time-frequency location.
  • the UE detecting the primary PDCCH includes one of the following: the UE detects a downlink control information format of a scheduling information load size from the PDCCH, or the UE detects a scheduling information load from the PDCCH 1 and the PDCCH 2 a size of the downlink control information format, where the scheduling information load size from the PDCCH, the PDCCH 1 and the PDCCH 2 is determined in a predefined manner or a high layer signaling manner, and the number of candidate PDCCHs of the aggregation level detected by the UE is kept in a predetermined number.
  • the PDCCH 1 is used to indicate physical downlink shared channel scheduling information
  • the PDCCH 2 is used to indicate physical uplink shared channel scheduling information
  • the PDCCH 1 is used to indicate physical uplink shared channel scheduling information
  • the PDCCH 2 is used to indicate physical downlink shared channel scheduling information.
  • the user-specific search space is a control channel element of the first time-frequency location.
  • the detecting, by the UE, the primary PDCCH includes: in a scenario of multi-carrier aggregation, the UE detects only the public search space on the primary serving cell.
  • a transmission system for downlink control information is provided.
  • the downlink control information transmission system according to the present invention is applied to an LTE-A system, and includes: a base station, configured to send downlink control information by using a PDCCH in a subframe; and a UE, configured to receive downlink control information; where the PDCCH includes: The PDCCH and the PDCCH, the information of the primary PDCCH is transmitted at the first time-frequency position, and the information of the PDCCH is transmitted at the second time-frequency position.
  • the information of the primary PDCCH includes indication information for indicating the PDCCH, and the information of the PDCCH is included. Scheduling information for scheduling physical uplink and/or downlink shared channels.
  • the foregoing base station includes: a first coding module, configured to correspond to all or part of the serving cell
  • the downlink control information included in the PDCCH is jointly encoded, where the joint coding is to combine multiple downlink control information formats into one or more downlink control information formats.
  • the foregoing base station includes: a second coding module, configured to jointly encode downlink control information included in a primary PDCCH corresponding to all or part of the serving cells, where the joint coding is to combine multiple downlink control information formats into one or more A downlink control information format.
  • the foregoing UE includes: a detecting module, configured to detect a primary PDCCH; a first acquiring module, configured to acquire indication information of the PDCCH from the primary PDCCH; and a second acquiring module, configured to be, according to the indication information, from the PDCCH Obtain scheduling information of uplink and/or downlink shared channels of all serving cells.
  • the base station transmits information of the primary PDCCH at the first time-frequency position of the subframe, and the base station transmits information of the PDCCH at the second time-frequency position of the subframe, where the information of the primary PDCCH includes an indication for indicating the PDCCH.
  • the information of the PDCCH includes scheduling information for scheduling the uplink and/or downlink shared channels, and the PDCCH resources of the original physical downlink control channel are insufficient to meet the new version in the related art.
  • the problem of demand can further ensure the system performance when more users access, and solve the interference problem between different base stations to some extent.
  • FIG. 2 is a schematic diagram of a frame structure of a TDD mode according to the related art
  • FIG. 3 is a schematic diagram of a method for transmitting downlink control information according to an embodiment of the present invention
  • 4 is a structural block diagram of a transmission system of downlink control information according to an embodiment of the present invention
  • FIG. 5 is a structural block diagram of a transmission system of downlink control information according to a preferred embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a method for transmitting downlink control information according to an embodiment of the present invention.
  • the method for transmitting downlink control information is applied to an LTE-A system, and includes the following processing: a base station passes a sub-frame.
  • the downlink control channel (PDCCH) transmits the downlink control information to the user equipment (UE).
  • the PDCCH includes: a primary PDCCH and a secondary PDCCH, where the base station transmits information of the primary PDCCH at a first time-frequency position of the subframe, and the base station is in the subframe.
  • the information of the PDCCH is transmitted at the second time-frequency position, the information of the primary PDCCH includes indication information for indicating the PDCCH, and the information of the PDCCH includes scheduling information for scheduling the physical uplink and/or the downlink shared channel.
  • the original physical downlink control channel PDCCH resources will not be sufficient to meet the new version requirements due to the increased demand for user access.
  • the above method is used to design the PDCCH of the master-slave structure in the LTE-Advance system, which ensures the system performance when more users access, and solves the interference problem between different base stations to a certain extent.
  • the first time-frequency position corresponding to the primary PDCCH of the subframe is: a first area of the first time slot of the subframe, or a first area of the first time slot of the subframe, where the first time
  • the downlink control information sent by the frequency location is the downlink control information configured for the subframe; or the first time-frequency location corresponding to the primary PDCCH of the subframe is: the second time slot of the subframe, where the first time-frequency location is sent.
  • the downlink control information is downlink control information configured for the next subframe.
  • the second time-frequency position corresponding to the PDCCH of the subframe is: a first region of a first slot of a subframe, or a second region of a first slot of a subframe, or a subframe of a subframe a second time slot, or a second area and a second time slot of the first time slot of the subframe, where the downlink control information sent by the second time-frequency position is downlink control information configured for the subframe; or
  • the second time-frequency position corresponding to the PDCCH of the subframe is: the second time slot of the subframe, where the downlink control information sent by the second time-frequency position is downlink control information configured for the next subframe.
  • the first area of the first time slot is the area where the PDCCH configured by the base station is located in the first time slot; the second area of the first time slot is the first time slot, and the PDSCH configured by the base station is located.
  • the indication information may include at least one of the following: location information occupied by the PDCCH, where the location information includes one or more of the following: slot location information from where the PDCCH is located; location information of the CCE from where the PDCCH is located ; PRB index from the PDCCH; modulation coding mode from PDCCH; transmission mode from PDCCH; load size from PDCCH; Demodulation reference signal DMRS antenna port number from PDCCH; DMRS scrambling code identification from PDCCH; DMRS layer number identification from PDCCH; carrier indication flag from PDCCH; aggregation level from PDCCH.
  • the foregoing first and second time-frequency positions may be determined in a predetermined manner, or may be notified by higher layer signaling of which time-frequency location the UE is used.
  • the UE determines the first and second time-frequency positions according to a predetermined manner; or the UE determines the first and second time-frequency positions by using the received high-layer signaling.
  • the foregoing indication information for indicating the PDCCH includes: the primary PDCCH indicates scheduling information of the PDCCH from the serving cell or the plurality of serving cells; and the foregoing is used for scheduling the physical uplink and/or the downlink shared channel.
  • the scheduling information includes: a scheduling information indicating a PDSCH and/or a PUSCH on a serving cell or a plurality of serving cells from a PDCCH.
  • the above serving cell may also be referred to as a component carrier.
  • the method may further include: co-coding the downlink control information included in the PDCCH corresponding to all or part of the serving cells, where the joint coding is Multiple downlink control information formats DCI format are combined into one or more DCI formats.
  • the foregoing jointly coding the downlink control information that is included in the PDCCH corresponding to all or part of the serving cells may include one of the following processes: (1) jointly coding the uplink grant information included in the PDCCH corresponding to all or part of the serving cells, and Coordinating the downlink authorization information included in the PDCCH corresponding to all or part of the serving cells;
  • the base station may further include the following process: jointly coding the downlink control information included in the primary PDCCH corresponding to all or part of the serving cells, where the joint coding To combine multiple DCI formats into one or more DCI formats.
  • jointly coding the downlink control information included in the primary PDCCH corresponding to all or part of the serving cells may include one of the following processes:
  • the primary PDCCH corresponding to all or a part of the serving cells is used to indicate that the downlink control information of the uplink grant information (UL Grant) in the PDCCH is jointly encoded, and the primary PDCCH corresponding to all or part of the serving cells is used. And performing joint coding for indicating downlink control information of downlink grant information (DL Grant) in the PDCCH.
  • the primary PDCCH corresponding to all or part of the serving cells is used for jointly coding the downlink control information indicating the uplink and downlink grant information in the PDCCH.
  • the information that the base station sends the primary PDCCH at the first time-frequency position of the subframe may further include: the base station notifying the downlink control information included in the primary PDCCH by using high-layer signaling, SIBx signaling, or a broadcast message.
  • the downlink control information included in the primary PDCCH includes at least one of the following: location information occupied by the primary PDCCH, where the location information includes at least one of the following: from the slot location information where the PDCCH is located, from the control channel where the PDCCH is located.
  • the receiving end may further include the following processing: Processing 1: the UE detects the primary PDCCH; For the public search space, the UE detecting the primary PDCCH includes one of the following:
  • the UE detects the downlink control information format of the two load sizes on the PDCCH time-frequency position configured by the base station according to the transmission mode information configured by the base station;
  • the UE detects a downlink control information format of the scheduling information payload size from the PDCCH, or the UE detects a downlink control information format of the scheduling information load size from the PDCCH1 and the PDCCH2, where
  • the PDCCH, the PDCCH1 and the scheduling information payload size from the PDCCH2 are determined in a predefined manner or a high-level signaling manner, and the number of candidate PDCCHs of the aggregation level detected by the UE remains unchanged for a predetermined number;
  • the UE acquires the information of the PDCCH according to the notification of the high layer signaling, where the PDCCH 1 is used to indicate the physical downlink shared channel scheduling information, the PDCCH 2 is used to indicate the physical uplink shared channel scheduling information, or the PDCCH 1 is used to indicate the physical uplink.
  • the shared channel scheduling information is used to indicate physical downlink shared channel scheduling information from PDCCH2.
  • the detecting, by the UE, the primary PDCCH is performed by the UE, where the UE detects the downlink control information format of the scheduling information load size of the PDCCH, or the UE detects downlink control information of the scheduling information load size of the PDCCH1 and the PDCCH2.
  • the scheduling information load size from the PDCCH, the PDCCH 1 and the PDCCH 2 is determined in a predefined manner or a high-level signaling manner, and the number of candidate PDCCHs of the aggregation level detected by the UE remains unchanged by a predetermined number, or Adding one or more aggregation level candidate PDCCH numbers to a predetermined number; wherein, the PDCCH 1 is used to indicate physical downlink shared channel scheduling information, and the PDCCH 2 is used to indicate physical uplink shared channel scheduling information; or, the PDCCH 1 is used to indicate The physical uplink shared channel scheduling information is used by the PDCCH 2 to indicate physical downlink shared channel scheduling information.
  • the following description is combined in three ways.
  • the UE blindly detects the DCI formats of the two load sizes at the PDCCH time-frequency position configured by the base station according to the transmission mode information configured by the base station; for the user-specific search space, the UE performs blind detection on the primary PDCCH.
  • the UE blindly detects the DCI formats of the two load sizes at the PDCCH time-frequency position configured by the base station according to the transmission mode information configured by the base station; for the user-specific search space, the UE performs blind detection on the primary PDCCH.
  • the UE detects a DCI format X, where the load size of the DCI format X is determined in a predefined manner or a high-level signaling manner, and the number of candidate PDCCHs of the aggregation level detected by the UE remains unchanged for a predetermined number. Or, the number of candidate PDCCHs of each aggregation level is increased by a predetermined number.
  • the number of candidate PDCCHs of the detected aggregation level ⁇ 1, 2, 4, 8 ⁇ is ⁇ 6, 6, 2, 2 ⁇ , respectively, or the number of candidate PDCCHs of each aggregation level is increased, and the aggregation level is ⁇ 1, 2
  • the number of candidate PDCCHs for 4, 8 ⁇ is ⁇ 6+A, 6+B, 2+C, 2+D ⁇ , where A, B, C, and D are positive integers, and A+B+C+D is less than Equal to 16 or less than or equal to 32.
  • the UE detects two types of DCI formats XI and X2, wherein the load sizes of the DCI formats XI and X2 are determined in a predefined manner or a high-level signaling manner, and the number of candidate PDCCHs of the aggregation level detected by the UE remains predetermined. The number is unchanged, or the number of candidate PDCCHs of each aggregation level is increased by a predetermined number.
  • the number of candidate PDCCHs of the detected aggregation level ⁇ 1, 2, 4, 8 ⁇ is ⁇ 6, 6, 2, 2 ⁇ , respectively, or the number of candidate PDCCHs of each aggregation level is increased, and the aggregation level is ⁇ 1, 2
  • the number of candidate PDCCHs for 4, 8 ⁇ is ⁇ 6+A, 6+B, 2+C, 2+D ⁇ , where A, B, C, and D are positive integers, and A+B+C+D is less than Equal to 16 or less than or equal to 32.
  • the UE detects a DCI format X, or the UE detects two DCI formats XI and X2, where the DCI format X, XI, and X2 load sizes are in a predefined manner or a high-level signaling manner. It is determined that the number of candidate PDCCHs of the aggregation level detected by the UE remains unchanged by a predetermined number; for example, the number of candidate PDCCHs whose detected aggregation level is ⁇ 4, 8 ⁇ is ⁇ 2, 4 ⁇ 0 for the user-specific search space respectively.
  • the UE performs blind detection on the primary PDCCH, including one of the following:
  • the UE detects a DCI format X, where the load size of the DCI format X is determined in a predefined manner or a high-level signaling manner, and the number of candidate PDCCHs of the aggregation level detected by the UE remains unchanged for a predetermined number. Or, the number of candidate PDCCHs of each aggregation level is increased by a predetermined number.
  • the number of candidate PDCCHs of the detected aggregation level ⁇ 1, 2, 4, 8 ⁇ is ⁇ 6, 6, 2, 2 ⁇ , respectively, or the number of candidate PDCCHs of each aggregation level is increased, and the aggregation level is ⁇ 1, 2
  • the number of candidate PDCCHs for 4, 8 ⁇ is ⁇ 6+A, 6+B, 2+C, 2+D ⁇ , where A, B, C, and D are positive integers, and A+B+C+D is less than Equal to 16 or less than or equal to 32.
  • the UE detects two types of DCI formats XI and X2, wherein the load sizes of the DCI formats XI and X2 are determined in a predefined manner or a high-level signaling manner, and the number of candidate PDCCHs of the aggregation level detected by the UE remains predetermined. The number is unchanged, or the number of candidate PDCCHs of each aggregation level is increased by a predetermined number.
  • the number of candidate PDCCHs of the detected aggregation level ⁇ 1, 2, 4, 8 ⁇ is ⁇ 6, 6, 2, 2 ⁇ , respectively, or the number of candidate PDCCHs of each aggregation level is increased, and the aggregation level is ⁇ 1, 2
  • Candidate PDCCH for 4, 8 ⁇ The numbers are ⁇ 6+A, 6+B, 2+C, 2+D ⁇ , where A, B, C, and D are positive integers, and A+B+C+D is less than or equal to 16 or less than or equal to 32.
  • the UE obtains the information of the PDCCH according to the notification of the high layer signaling.
  • the UE performs blind detection on the primary PDCCH, including one of the following:
  • the UE detects a DCI format X, where the load size of the DCI format X is determined in a predefined manner or a high-level signaling manner, and the number of candidate PDCCHs of the aggregation level detected by the UE remains unchanged for a predetermined number. Or, the number of candidate PDCCHs of each aggregation level is increased by a predetermined number.
  • the number of candidate PDCCHs of the detected aggregation level ⁇ 1, 2, 4, 8 ⁇ is ⁇ 6, 6, 2, 2 ⁇ , respectively, or the number of candidate PDCCHs of each aggregation level is increased, and the aggregation level is ⁇ 1, 2
  • the number of candidate PDCCHs for 4, 8 ⁇ is ⁇ 6+A, 6+B, 2+C, 2+D ⁇ , where A, B, C, and D are positive integers, and A+B+C+D is less than Equal to 28 or less than or equal to 44.
  • the UE detects two DCI formats XI and X2, wherein the load sizes of the DCI formats XI and X2 are determined in a predefined manner or a high-level signaling manner, and the number of candidate PDCCHs of the aggregation level detected by the UE remains predetermined. The number is unchanged, or the number of candidate PDCCHs of each aggregation level is increased by a predetermined number.
  • the number of candidate PDCCHs of the detected aggregation level ⁇ 1, 2, 4, 8 ⁇ is ⁇ 6, 6, 2, 2 ⁇ , respectively, or the number of candidate PDCCHs of each aggregation level is increased, and the aggregation level is ⁇ 1, 2
  • the number of candidate PDCCHs for 4, 8 ⁇ is ⁇ 6+A, 6+B, 2+C, 2+D ⁇ , where A, B, C, and D are positive integers, and A+B+C+D is less than Equal to 12 or less than or equal to 28.
  • DCI format X is used to indicate scheduling information from the PDCCH; DCI format XI and
  • X2 is used to indicate scheduling information from PDCCH1 and PDCCH2, and PDCCH 1 is used to indicate physical downlink shared channel scheduling information, PDCCH2 is used to indicate physical uplink shared channel scheduling information, or PDCCH1 is used to indicate physical uplink shared channel scheduling.
  • Information from PDCCH 2 is used to indicate physical downlink shared channel scheduling information.
  • the above public search space includes the first 16 control channel elements of the first time-frequency location.
  • the user-specific search space is a control channel element of the first time-frequency location.
  • the detecting, by the UE, the primary PDCCH includes, but is not limited to, the following processing: In a scenario of multi-carrier aggregation, the UE detects only the public search space on the primary serving cell.
  • Process 2 The UE acquires indication information of the PDCCH from the primary PDCCH.
  • Process 3 The UE acquires scheduling information of the uplink and/or downlink shared channels of all or part of the serving cells from the PDCCH according to the indication information.
  • the physical downlink control channel information is transmitted at the first time-frequency position and the second time-frequency position of the subframe.
  • the physical downlink control channel corresponding to the first time-frequency position is referred to as a primary PDCCH
  • the physical downlink control channel corresponding to the second time-frequency location is referred to as a secondary PDCCH.
  • the first time-frequency location refers to an area where a physical downlink control channel (PDCCH) configured by the base station is located, and the number of OFDM symbols occupied in the time domain is an indication value of a physical control format indication channel (PCFICH), and the starting position is each subframe.
  • the first OFDM symbol is transmitted at the first time-frequency position and the second time-frequency position of the subframe.
  • the second time-frequency location refers to the area where the physical downlink shared channel (PDSCH) configured by the base station is located, and the number of OFDM symbols occupied in the time domain is less than or equal to the number of symbols occupied by the downlink shared channel, and the starting position is the subframe number.
  • n OFDM symbols, the above n is equal to the indication value of the Physical Control Format Indicator Channel (PCFICH) of the subframe plus one.
  • PCFICH Physical Control Format Indicator Channel
  • the indication information of the foregoing primary PDCCH includes one or more of the following information from the PDCCH: a time-frequency location occupied by the PDCCH (including a resource allocation type and resource time-frequency location information); information about the slot location where the PDCCH is located; Modulation coding mode from PDCCH; transmission mode from PDCCH; load size from PDCCH; demodulation reference signal (DMRS) antenna port number from PDCCH; demodulation reference signal (DMRS) scrambling code identification from PDCCH; a demodulation reference signal (DMRS) layer number identifier; a carrier indication identifier from the PDCCH; The aggregation level from the PDCCH.
  • DMRS demodulation reference signal
  • DMRS demodulation reference signal
  • DMRS demodulation reference signal
  • DMRS demodulation reference signal
  • DMRS demodulation reference signal
  • DMRS demodulation reference signal
  • DMRS demodulation reference signal
  • DMRS demodulation reference signal
  • DMRS
  • the foregoing transmitting the second time-frequency position of the PDCCH may be determined in a predetermined manner, or may be notified by higher layer signaling of which time-frequency location the UE is used.
  • the foregoing second time-frequency location may also be an area where the physical downlink control channel (PDCCH) is located, and is consistent with the first time-frequency location.
  • PDCCH physical downlink control channel
  • the indication information of the primary PDCCH includes one or more of the following information from the PDCCH: a time-frequency location occupied by the PDCCH (including location information of a control channel element CCE); a modulation and coding scheme from the PDCCH; and a transmission mode from the PDCCH ; the load size from the PDCCH; the demodulation reference signal (DMRS) antenna port number from the PDCCH; the demodulation reference signal (DMRS) scrambling code identification from the PDCCH; the demodulation reference signal (DMRS) layer number identification from the PDCCH; The carrier indication identifier of the PDCCH; the aggregation level from the PDCCH.
  • the foregoing PDCCH is used to schedule a physical downlink shared channel and/or an uplink shared channel of one or more serving cells (or component carriers) corresponding to each user.
  • the slave PDCCH corresponding to each of the foregoing serving cells includes a downlink control information format (DCI format), and jointly encodes downlink control information included in the PDCCH corresponding to all or part of the serving cells, and merges into one or more DCI formats.
  • DCI format downlink control information format
  • the number of blind detections of the PDCCH is reduced, and the blind detection blocking rate of the PDCCH is reduced, thereby improving system performance and reliability.
  • Method 1 All or part of the serving cell corresponding to the uplink grant information (UL Grant) included in the PDCCH is jointly coded, and all or part of the serving cell corresponding to the downlink grant information (DL Grant) included in the PDCCH is jointly encoded.
  • the uplink and downlink grant information respectively perform jointly coded PDCCHs corresponding to one primary PDCCH; or the uplink and downlink grant information are jointly coded from the PDCCH, and the same primary PDCCH is used to indicate the detection information.
  • Method 2 All or part of the serving cell corresponding to the uplink and downlink grant information included in the PDCCH are jointly encoded.
  • the uplink and downlink grant information are jointly coded by the same PDCCH, and the same primary PDCCH is used to indicate the detection information.
  • the user equipment (UE) performs blind detection on the primary PDCCH, and the detected primary PDCCH is used to indicate related detection information from the PDCCH, and acquires scheduling information of uplink and/or downlink shared channels on all serving cells by using the PDCCH. .
  • the UE performs blind detection, the DCI format of the public search space and the user-specific search space needs to be detected.
  • Mode 1 For the public search space, the UE performs blind detection on the PDCCH time-frequency position configured by the base station according to the transmission mode information configured by the base station, and for the user-specific search space, the UE first starts at the first time. The primary PDCCH is blindly detected at the frequency position, and then the PDCCH is detected and decoded at the corresponding second time-frequency position according to the indication information of the primary PDCCH. A detailed description will be given below.
  • the UE blindly detects the DCI formats of the two load sizes according to the transmission mode information configured by the base station. According to Table 1, the number of candidate PDCCHs with the aggregation level of ⁇ 4, 8 ⁇ is ⁇ 4, 2 ⁇ , respectively.
  • a downlink control information format X (DCI format X) is adopted, and the DCI format X is a new DCI format, and the load size is in a predefined manner or a high-level signaling notification.
  • the mode is used to indicate scheduling information from the PDCCH.
  • the number of candidate PDCCHs with aggregation level ⁇ 1, 2, 4, 8 ⁇ is ⁇ 6, 6, 2, 2 ⁇ , respectively, and blind detection is required 16 times. Or increase the number of candidate PDCCHs of each aggregation level until the number of blind detections of the public and private search spaces does not exceed 44 or 60 times.
  • the number of candidate PDCCHs with aggregation level ⁇ 1, 2, 4, 8 ⁇ is ⁇ 6+A, 6+B, 2+C, 2+D ⁇ , where A, B, C, and D As a positive integer, A+B+C+D is less than or equal to 16 or 32.
  • the number of candidate PDCCHs with an aggregation level of ⁇ 1, 2, 4, 8 ⁇ is ⁇ 6, 6, 2, 2 ⁇ , respectively, and needs to be blindly detected 32 times. Or increase the number of candidate PDCCHs of each aggregation level until the number of blind detections of the public and private search spaces does not exceed 60 times.
  • the number of candidate PDCCHs with aggregation level ⁇ 1, 2, 4, 8 ⁇ is ⁇ 6+A, 6+B, 2+C, 2+D ⁇ , where A, B, C, and D are A positive integer, A+B+C+D is less than or equal to 16.
  • Manner 2 For the public and user-specific search space, the UE performs blind detection on the primary PDCCH at the first time-frequency location, and then detects the PDCCH from the corresponding second PDCCH according to the indication information of the primary PDCCH. And decoding. A detailed description will be given below.
  • a downlink control information format X (DCI format X) is used to indicate scheduling information from the PDCCH.
  • the number of candidate PDCCHs with aggregation level ⁇ 4, 8 ⁇ is ⁇ 2, 4 ⁇ , and blind detection is required 6 times.
  • a downlink control information format X (DCI format X) is used for indicating scheduling information from the PDCCH.
  • the number of candidate PDCCHs with aggregation level ⁇ 1, 2, 4, 8 ⁇ is ⁇ 6, 6, 2, 2 ⁇ , respectively, and blind detection is required 16 times. Or increase the number of candidate PDCCHs of each aggregation level until the number of blind detections of the public and private search spaces does not exceed 44 or 60 times.
  • the number of candidate PDCCHs with aggregation level ⁇ 1, 2, 4, 8 ⁇ is ⁇ 6+A, 6+B, 2+C, 2+D ⁇ , where A, B, C, and D are A positive integer, A+B+C+D is less than or equal to 16 or 32.
  • two downlink control information formats XI and X2 (DCI format XI and X2) for indicating scheduling information from the PDCCH.
  • the number of candidate PDCCHs with aggregation level ⁇ 4, 8 ⁇ is respectively For ⁇ 2, 4 ⁇ , blind detection is required 12 times.
  • the number of candidate PDCCHs with aggregation level ⁇ 1, 2, 4, 8 ⁇ is ⁇ 6, 6, 2, 2 ⁇ , respectively, and needs to be blindly detected 32 times. Or increase the number of candidate PDCCHs of each aggregation level until the number of blind detections of the public and private search spaces does not exceed 60 times.
  • the number of candidate PDCCHs with aggregation level ⁇ 1, 2, 4, 8 ⁇ is ⁇ 6+A, 6+B, 2+C, 2+D ⁇ , where A, B, C, and D are A positive integer, A+B+C+D is less than or equal to 16.
  • Manner 3 For the public search space, the UE obtains corresponding PDCCH information according to the notification of the high layer signaling, and for the user-specific search space, the UE first performs blind detection on the primary PDCCH at the first time-frequency position, and then according to the primary PDCCH. The indication information is detected and decoded from the PDCCH at the corresponding second time-frequency position. A detailed description will be given below. In the public search space, the UE does not need to perform detection. In the user-specific search space, for the primary PDCCH, a downlink control information format X (DCI format X) is used for indicating scheduling information from the PDCCH.
  • DCI format X downlink control information format X
  • the number of candidate PDCCHs with aggregation level ⁇ 1, 2, 4, 8 ⁇ is ⁇ 6, 6, 2, 2 ⁇ , respectively, and blind detection is required 16 times. Or increase the number of candidate PDCCHs of each aggregation level until the number of blind detections of the public and private search spaces does not exceed 44 or 60 times.
  • the number of candidate PDCCHs with aggregation level ⁇ 1, 2, 4, 8 ⁇ is ⁇ 6+A, 6+B, 2+C, 2+D ⁇ , where A, B, C, and D are A positive integer, A+B+C+D is less than or equal to 28 or 44.
  • the number of candidate PDCCHs with an aggregation level of ⁇ 1, 2, 4, 8 ⁇ is ⁇ 6, 6, 2, 2 ⁇ , respectively, and needs to be blindly detected 32 times. Or increase the number of candidate PDCCHs of each aggregation level until the number of blind detections of the public and private search spaces does not exceed 44 or 60 times.
  • the number of candidate PDCCHs with aggregation level ⁇ 1, 2, 4, 8 ⁇ is ⁇ 6+A, 6+B, 2+C, 2+D ⁇ , where A, B, C, and D are A positive integer, A+B+C+D is less than or equal to 12 or 28.
  • the base station sends physical downlink control channel information at a first time-frequency location and a second time-frequency location of each subframe.
  • the physical downlink control channel of the first time-frequency location is referred to as a primary PDCCH
  • the physical downlink control channel of the second time-frequency location is referred to as a secondary PDCCH.
  • the first time-frequency location refers to the area where the physical downlink control channel (PDCCH) configured by the base station is located, and the number of OFDM symbols occupied in the time domain is an indication value of a physical control format indication channel (PCFICH), and the starting position is each subframe.
  • the second time-frequency location refers to the area where the physical downlink shared channel (PDSCH) configured by the base station is located, and the number of OFDM symbols occupied in the time domain is less than or equal to the number of symbols occupied by the downlink shared channel, and the starting position is the nth of the subframe. OFDM symbols, where n is equal to the indicated value of the Physical Control Format Indicator Channel (PCFICH) of the subframe plus one.
  • PCFICH Physical Control Format Indicator Channel
  • the indication information of the primary PDCCH includes one or more of the following information from the PDCCH: a time-frequency location occupied by the PDCCH (including a resource allocation type and resource time-frequency location information); a slot position information from the PDCCH; Modulation coding mode of PDCCH; transmission mode from PDCCH; load size from PDCCH; demodulation reference signal (DMRS) antenna port number from PDCCH; demodulation reference signal (DMRS) scrambling code identification from PDCCH; solution from PDCCH Tuning reference signal (DMRS) layer number identification; carrier indication from the PDCCH; aggregation level from the PDCCH.
  • DMRS demodulation reference signal
  • DMRS demodulation reference signal
  • DMRS demodulation reference signal
  • DMRS demodulation reference signal
  • the foregoing transmitting the second time-frequency position of the PDCCH may be determined in a predetermined manner, or may be notified by higher layer signaling of which time-frequency location the UE is used.
  • the foregoing second time-frequency location may also be an area where the physical downlink control channel (PDCCH) is located, and is consistent with the first time-frequency location.
  • PDCCH physical downlink control channel
  • the indication information of the primary PDCCH includes one or more of the following information from the PDCCH: a time-frequency location occupied by the PDCCH (including location information of a control channel element CCE); a modulation and coding scheme from the PDCCH; and a transmission mode from the PDCCH ; the load size from the PDCCH; Demodulation reference signal (DMRS) antenna port number from PDCCH; demodulation reference signal (DMRS) scrambling code identification from PDCCH; identification of demodulation reference signal (DMRS) layer number from PDCCH; carrier indication flag from PDCCH; The aggregation level of the PDCCH.
  • DMRS Demodulation reference signal
  • DMRS demodulation reference signal
  • DMRS demodulation reference signal
  • the slave PDCCH is used to schedule a physical downlink shared channel and/or an uplink shared channel of one or more serving cells (or referred to as component carriers) corresponding to each user.
  • Each serving cell corresponds to a secondary PDCCH, which includes a downlink control information format (DCI format) for scheduling a physical downlink shared channel and/or an uplink shared channel.
  • DCI format downlink control information format
  • All the downlink control information of the primary PDCCH corresponding to the serving cell is jointly coded and combined into one or more DCI formats to reduce the number of blind detections of the PDCCH and reduce the blind detection blocking rate of the PDCCH, thereby improving system performance and reliability. Sex.
  • Method 1 All or part of the primary PDCCH corresponding to the serving cell, used to indicate the downlink control information of the uplink grant information (UL Grant) in the PDCCH for joint coding, and all or part of the service
  • the primary PDCCH corresponding to the cell is used for joint coding for indicating downlink control information of downlink grant information (DL Grant) in the PDCCH.
  • Method 2 In the primary PDCCH corresponding to all or part of the serving cells, the downlink control information used to indicate the uplink and downlink grant information in the PDCCH is jointly encoded. High-level signaling, SIBx signaling, or broadcast messages are used to inform the payload size of the jointly encoded primary PDCCH.
  • the user equipment performs blind detection on the primary PDCCH, and the detected primary PDCCH is used to indicate related detection information from the PDCCH, and acquires scheduling information of uplink and/or downlink shared channels on all serving cells by using the PDCCH. .
  • Mode 1 For the public search space, the UE configures the base station according to the transmission mode information configured by the base station.
  • Blind detection is performed on the PDCCH time-frequency position, and for the user-specific search space, the UE first is at the first time-frequency position. Performing blind detection on the primary PDCCH, and then detecting and decoding the PDCCH at the corresponding second time-frequency position according to the indication information of the primary PDCCH. A detailed description will be given below.
  • the UE blindly detects the DCI formats of the two load sizes according to the transmission mode information configured by the base station. According to Table 1, the number of candidate PDCCHs with the aggregation level of ⁇ 4, 8 ⁇ is ⁇ 4, 2 ⁇ , respectively. Blind detection 12 times.
  • a downlink control information format X (DCI format X) is used for indicating scheduling information from the PDCCH.
  • DCI format X Downlink control information format X
  • the number of candidate PDCCHs with aggregation level ⁇ 1, 2, 4, 8 ⁇ is ⁇ 6, 6, 2, 2 ⁇ , respectively, and blind detection is required 16 times.
  • the number of candidate PDCCHs with aggregation level ⁇ 1, 2, 4, 8 ⁇ is ⁇ 6+A, 6+B, 2+C, 2+D ⁇ , where A, B, C, and D are A positive integer, A+B+C+D is less than or equal to 16 or 32.
  • two downlink control information formats XI and X2 (DCI format XI and X2) for indicating scheduling information from the PDCCH.
  • the number of candidate PDCCHs with an aggregation level of ⁇ 1, 2, 4, 8 ⁇ is ⁇ 6, 6, 2, 2 ⁇ , respectively, and needs to be blindly detected 32 times.
  • the number of candidate PDCCHs with aggregation level ⁇ 1, 2, 4, 8 ⁇ is ⁇ 6+A, 6+B, 2+C, 2+D ⁇ , where A, B, C PD is a positive integer, and A+B+C+D is less than or equal to 16.
  • Manner 2 For the public and user-specific search space, the UE performs blind detection on the primary PDCCH at the first time-frequency location, and then detects the PDCCH from the corresponding second PDCCH according to the indication information of the primary PDCCH. And decoding. A detailed description will be given below.
  • a downlink control information format X (DCI format X) is used to indicate scheduling information from the PDCCH.
  • DCI format X the number of candidate PDCCHs with aggregation level ⁇ 4, 8 ⁇ is ⁇ 2, 4 ⁇ , and blind detection is required 6 times.
  • a downlink control information format X (DCI format X) is used for indicating scheduling information from the PDCCH.
  • the number of candidate PDCCHs with aggregation level ⁇ 1, 2, 4, 8 ⁇ is ⁇ 6, 6, 2, 2 ⁇ , respectively, and blind detection is required 16 times.
  • the number of candidate PDCCHs with aggregation level ⁇ 1,2, 4, 8 ⁇ is ⁇ 6+A, 6+B, 2+C, 2+D ⁇ , where A, B, C and D is a positive integer, and A+B+C+D is less than or equal to 16 or 32.
  • two downlink control information formats XI and X2 (DCI format XI and X2) for indicating scheduling information from the PDCCH.
  • the number of candidate PDCCHs with aggregation level ⁇ 4, 8 ⁇ is (2, 4 ⁇ , and blind detection is required 12 times.
  • the aggregation level is The number of candidate PDCCHs for l, 2, 4, and 8 ⁇ is ⁇ 6, 6, 2, 2 ⁇ , respectively, and needs to be blindly detected 32 times. Or increase the number of candidate PDCCHs for each aggregation level until the public and private search spaces The number of blind pings is not more than 60.
  • the number of candidate PDCCHs with aggregation level ⁇ 1, 2, 4, 8 ⁇ is ⁇ 6+A, 6+B, 2+C, 2+D ⁇ , respectively.
  • Method 3 For the public search space, the UE obtains corresponding PDCCH information according to the notification of the high layer signaling, and searches for the user-specific search. In the space, the UE performs blind detection on the primary PDCCH at the first time-frequency position, and then detects and decodes the PDCCH from the corresponding second time-frequency position according to the indication information of the primary PDCCH. In the public search space, the UE does not need to perform detection. In the user-specific search space, for the main PDCCH, A downlink control information format X (DCI format X) is used to indicate scheduling information from the PDCCH.
  • DCI format X DCI format X
  • the number of candidate PDCCHs with an aggregation level of ⁇ 1, 2, 4, 8 ⁇ is ⁇ 6, 6, respectively. 2, 2 ⁇ , need to blindly detect 16 times. Or increase the number of candidate PDCCHs in each aggregation level until the number of blind detections in the public and private search spaces does not exceed 44 or 60 times.
  • Aggregation level is ⁇ 1
  • the number of candidate PDCCHs for 2, 4, 8 ⁇ is ⁇ 6+A, 6+B, 2+C, 2+D ⁇ , where A, B, C, and D are positive integers, A+B+C+ D is less than or equal to 28 or 44.
  • the aggregation level is ⁇ 1, 2, 4, 8 ⁇
  • the number of candidate PDCCHs is ⁇ 6, 6, 2, 2 ⁇ , and needs to be blindly detected 32 times. Or increase the number of candidate PDCCHs in each aggregation level until the number of blind detections in the public and private search spaces does not exceed 44 or 60.
  • the base station sends the physical downlink control channel at the first time-frequency position and the second time-frequency position of each subframe. information.
  • the physical downlink control channel of the first time-frequency location is referred to as a primary PDCCH, and the physical downlink control channel of the second time-frequency location is referred to as a secondary PDCCH.
  • the first time-frequency location refers to an area where a physical downlink control channel (PDCCH) configured by the base station is located, and the number of OFDM symbols occupied in the time domain is an indication value of a physical control format indication channel (PCFICH), and the starting position is each subframe.
  • the second time-frequency location refers to the area where the physical downlink shared channel (PDSCH) configured by the base station is located, and the number of OFDM symbols occupied in the time domain is less than or equal to the number of symbols occupied by the downlink shared channel, and the starting position is the subframe number.
  • the indication information of the foregoing primary PDCCH includes one or more of the following information from the PDCCH: a time-frequency location occupied by the PDCCH (including a resource allocation type and resource time-frequency location information); information about the slot location where the PDCCH is located; Modulation coding mode from PDCCH; transmission mode from PDCCH; load size from PDCCH; demodulation reference signal (DMRS) antenna port number from PDCCH; demodulation reference signal (DMRS) scrambling code identification from PDCCH; Demodulation Reference Signal (DMRS) layer number identification; carrier indication from the PDCCH; aggregation level from the PDCCH.
  • DMRS demodulation reference signal
  • DMRS Demodulation Reference Signal
  • the foregoing transmitting the second time-frequency position of the PDCCH may be determined in a predetermined manner, or may be notified by higher layer signaling of which time-frequency location the UE is used.
  • the foregoing second time-frequency position may also refer to an area where the physical downlink control channel PDCCH is located, and is consistent with the first time-frequency position.
  • the indication information of the foregoing primary PDCCH includes one or more of the following information from the PDCCH: a time-frequency location occupied by the PDCCH (including location information of a control channel element CCE); Modulation coding mode from PDCCH; transmission mode from PDCCH; load size from PDCCH; demodulation reference signal (DMRS) antenna port number from PDCCH; demodulation reference signal (DMRS) scrambling code identification from PDCCH; Demodulation Reference Signal (DMRS) layer number identification; carrier indication from the PDCCH; aggregation level from the PDCCH.
  • the slave PDCCH is used to schedule a physical downlink shared channel and/or an uplink shared channel of one or more serving cells (or referred to as component carriers) corresponding to each user.
  • the slave PDCCH corresponding to each serving cell includes a downlink control information format (DCI format), and jointly encodes downlink control information included in the PDCCH corresponding to all or part of the serving cells, and merges into one or more DCI formats.
  • DCI format downlink control information format
  • the downlink control information included in the primary PDCCH corresponding to all or part of the serving cells is jointly encoded and combined into one or more DCI formats.
  • the UE is notified by the high layer signaling, the SIBx signaling, or the broadcast message, and the information of the primary PDCCH includes one or more of the following: a time-frequency location occupied by the primary PDCCH (including location information of a control channel element CCE); Modulation coding mode; transmission mode of the primary PDCCH; load size of the primary PDCCH; demodulation reference signal (DMRS) antenna port number of the primary PDCCH; demodulation reference signal (DMRS) scrambling code identification of the primary PDCCH; demodulation reference of the primary PDCCH Signal (DMRS) layer number identification; The carrier indication identifier of the primary PDCCH; the aggregation level of the primary PDCCH.
  • DMRS demodulation reference signal
  • DMRS demodulation reference signal
  • DMRS demodulation reference signal
  • DMRS demodulation reference signal
  • DMRS demodulation reference signal
  • DMRS demodulation reference signal
  • DMRS demodulation reference signal
  • DMRS de
  • the UE detects and decodes the primary PDCCH according to the high layer signaling, the SIBx signaling, or the broadcast message, and detects and decodes the PDCCH indicated by the primary PDCCH.
  • 4 is a structural block diagram of a transmission system of downlink control information according to an embodiment of the present invention. Where, applied to
  • the downlink control information transmission system includes: a base station 40, configured to send downlink control information by using a physical downlink control channel (PDCCH) in a subframe; a user equipment (UE) 42, setting The PDCCH includes: a primary PDCCH and a secondary PDCCH, where information of the primary PDCCH is transmitted at a first time-frequency position of the subframe, and information of the PDCCH is transmitted at a second time-frequency position of the subframe, the primary The information of the PDCCH includes indication information for indicating a PDCCH, and the information of the PDCCH includes scheduling information for scheduling a physical uplink and/or a downlink shared channel.
  • PDCCH physical downlink control channel
  • the first time-frequency position corresponding to the primary PDCCH of the subframe n of the subframe is transmitted on the second time slot of the subframe n-1 of the subframe, or in the first time slot of the subframe n
  • the first area is transmitted or transmitted on the second area of the first slot of the subframe n.
  • the second time-frequency position corresponding to the PDCCH of the subframe n of the subframe is transmitted on the second time slot of the subframe n-1 of the subframe, or in the first time slot of the subframe n Transmitting on the first area, or transmitting on the second area of the first time slot of the subframe n, or transmitting on the second time slot of the subframe n, or in the first time slot of the subframe n
  • the second area and the second time slot are transmitted together.
  • the first area of the first time slot is the area in which the PDCCH configured by the base station is located in the first time slot; the second area of the first time slot is the first time slot, and the PDSCH configured by the base station is located. region.
  • the foregoing indication information of the primary PDCCH for indicating the PDCCH includes one or more of the following: location information occupied by the PDCCH (including one or more of the following: slot location information from where the PDCCH is located; and a control channel from where the PDCCH is located) Location information of the element CCE; from the PRB index where the PDCCH is located); Modulation coding mode from PDCCH; transmission mode from PDCCH; load size from PDCCH; demodulation reference signal (DMRS) antenna port number from PDCCH; demodulation reference signal (DMRS) scrambling code identification from PDCCH; Demodulation Reference Signal (DMRS) layer number identification; carrier indication from the PDCCH; aggregation level from the PDCCH.
  • location information occupied by the PDCCH including one or more of the following: slot location information from where the PDCCH is located; and a control channel from where the PDCCH is located
  • Location information of the element CCE from the PRB index where the PDCCH is located
  • the foregoing first and second time-frequency positions may be determined in a predetermined manner, or may be notified by higher layer signaling of which time-frequency location the UE is used.
  • the base station 40 includes: a first encoding module 400, configured to jointly encode downlink control information included in the PDCCH corresponding to all or part of serving cells, where the joint coding is to perform multiple downlink control
  • the information format DCI format is merged into one or more DCI formats.
  • the base station 40 includes: a second encoding module 402, configured to jointly encode downlink control information included in a primary PDCCH corresponding to all or part of the serving cells, where the joint coding is to multiple DCI formats Merge into one or more DCI formats.
  • the downlink control information included in the primary PDCCH corresponding to all or part of the serving cells may be jointly encoded and combined into one or more downlink control information formats DCI form a t.
  • the UE is notified by high layer signaling, SIBx signaling or a broadcast message.
  • the downlink control information included in the primary PDCCH includes one or more of the following: a time-frequency location occupied by the primary PDCCH (including location information of a control channel element CCE); a modulation coding mode of the primary PDCCH; a transmission mode of the primary PDCCH; Load size of the PDCCH; demodulation reference signal (DMRS) antenna port number of the primary PDCCH; Demodulation reference signal (DMRS) scrambling code identification of the primary PDCCH; demodulation reference signal (DMRS) layer number identification of the primary PDCCH; carrier indication identity of the primary PDCCH; aggregation level of the primary PDCCH.
  • DMRS demodulation reference signal
  • DMRS Demodulation reference signal
  • DMRS demodulation reference signal
  • the UE 42 may further include: a detecting module 420, configured to perform blind detection on the primary PDCCH; the first obtaining module 422, configured to acquire indication information of the PDCCH from the primary PDCCH; The module 424 is configured to acquire scheduling information of the uplink and/or downlink shared channels of all serving cells from the PDCCH according to the indication information.
  • the UE detects and decodes the primary PDCCH according to the high layer signaling, the SIBx signaling, or the broadcast message, and detects and decodes the PDCCH indicated by the primary PDCCH.
  • the PDCCHs of the multiple carriers are jointly coded in the PDCCH structure of the master-slave, thereby ensuring more user access.
  • the system performance at the time, and to some extent solve the interference problem between different base stations.
  • the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices.
  • the invention is not limited to any specific combination of hardware and software.
  • the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention se rapporte à un procédé et à un système adaptés pour transmettre des données de contrôle sur la liaison descendante. L'invention se rapporte à un système LTE-A. Le procédé selon l'invention comprend les étapes suivantes : un eNodeB envoie des données de contrôle sur la liaison descendante à un UE via un PDCCH par le biais d'une sous-trame; le PDCCH comprenant : un PDCCH primaire et un PDCCH secondaire; ensuite, le eNodeB envoie des informations relatives au PDCCH primaire à une première position sur le plan temps/fréquence; le eNodeB envoie des informations relatives au PDCCH secondaire à une seconde position sur le plan temps/fréquence; les informations du PDCCH primaire contiennent des informations de commande qui donnent des instructions de commande au PDCCH secondaire, et les informations du PDCCH secondaire contiennent des informations de programmation pour programmer un canal physique partagé sur la liaison montante ou sur la liaison descendante. Grâce aux solutions techniques décrites dans la présente invention, la performance du système lors de l'accès d'un plus grand nombre d'abonnés peut être garantie et le problème d'interférence entre des eNodeB différents est résolu dans une certaine mesure.
PCT/CN2012/072556 2011-04-29 2012-03-19 Procédé et système pour transmettre des données de contrôle sur la liaison descendante WO2012146095A1 (fr)

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