WO2013107250A1 - Procédé de transmission d'informations de commande de liaison descendante et station de base - Google Patents

Procédé de transmission d'informations de commande de liaison descendante et station de base Download PDF

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Publication number
WO2013107250A1
WO2013107250A1 PCT/CN2012/087354 CN2012087354W WO2013107250A1 WO 2013107250 A1 WO2013107250 A1 WO 2013107250A1 CN 2012087354 W CN2012087354 W CN 2012087354W WO 2013107250 A1 WO2013107250 A1 WO 2013107250A1
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Prior art keywords
format
allocation
information
dci format
bits
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PCT/CN2012/087354
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English (en)
Chinese (zh)
Inventor
石靖
戴博
夏树强
方惠英
李新彩
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中兴通讯股份有限公司
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Publication of WO2013107250A1 publication Critical patent/WO2013107250A1/fr

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    • 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

  • the present invention relates to the field of wireless communications, and in particular, to a downlink control applicable in an LTE/LTE-A (Long Term Evolution/Long Term Evolution Advance) system and an evolved system thereof. Method of transmitting information and base station. Background technique
  • MTC Machine Type Communication
  • MTC UE Machine Type Communication user terminal
  • M2M Machine to Machine, ⁇ 2 ⁇
  • MTC UE Machine Type Communication user terminal
  • GSM Global System of Mobile communication
  • M2M multi-class data services based on LTE/LTE-A will also be more attractive. Only the cost of the LTE-M2M device can be lower than that of the MTC terminal of the GSM system, and the M2M service can be truly transferred from the GSM to the LTE system.
  • the cost of affecting MTC UEs is mainly in baseband processing and radio frequency. Reducing the number of RF antennas is a very effective way to reduce the cost of MTC UEs. That is, the receiving antenna of the MTC UE is smaller than the minimum configuration of the two receiving antennas of the conventional legacy LTE terminal (Ordinary Legacy R8/9/10 UE, OL UE for short).
  • both the low-cost MTC UE and the legacy UE can transmit DCI (Downlink Control Information) through the PDCCH (Physical Downlink Control Channel), and the MTC UE and the new version of LTE-A ( The New Version Rl l/etc. UE, abbreviated as NV UE, can transmit DCI information through an enhanced Physical Downlink Control Channel (ePDCCH).
  • ePDCCH enhanced Physical Downlink Control Channel
  • the NV UE uses the DCI in the LTE/LTE-A system, and the MTC UE also obtains the DCI by demodulating the PDCCH/ePDCCH channel, so as to implement the PDSCH (Physical Downlink Share Channel, Physical Downlink Shared Channel) and PUSCH (Physical Uplink Share Channel) demodulation and control.
  • PDSCH Physical Downlink Share Channel
  • PUSCH Physical Uplink Share Channel
  • the existing LTE/LTE-A frame structure is shown in Figure 2 and Figure 3.
  • FIG. 2 is a schematic diagram of a frame structure of a FDD (Frequency Division Duplexing) mode according to the related art.
  • a 10ms radio frame consists of twenty slots (lengths) with lengths of 0.5ms and numbers 0 ⁇ 19.
  • the slots 2i and 2i+1 form sub-frames of length 1ms. i.
  • FIG. 3 is a schematic diagram of a frame structure of a TDD (Time Division Duplexing) mode according to the related art.
  • a 10 ms radio frame is composed of two half frames of 5 ms length.
  • One field includes five subframes of length 1 ms, and subframe i is defined as two slots 2i and 2i+1 that are 0.5 ms long.
  • LTE/LTE-A Physical Control Format Indicator Channel (PCFICH) and Physical Hybrid Automatic Retransmission Request Indicator Channel (Physical Hybrid Automatic Retransmission Request Indicator Channel) , referred to as PHICH) and the physical downlink control channel.
  • PCFICH Physical Control Format Indicator Channel
  • PHICH Physical Hybrid Automatic Retransmission Request Indicator Channel
  • the information carried by the PCFICH is used to indicate Orthogonal Frequency Division Multiplexing (OFDM) symbol feedback information for transmitting the PDCCH in one subframe.
  • the PDCCH is used to carry the DCI, and includes: uplink and downlink scheduling information, and uplink power control information.
  • DCI Format 0, 1, 1A, 1B, 1C, 1D, 2, 2A, 2B, 2C, 3, 3A, 4 are included.
  • the information included in DCI Format 0 includes: carrier indication, format 0/1A identifier, PUSCH frequency hopping identifier, PUSCH resource allocation and frequency hopping allocation, MCS (Modulation Code Scheme) level and RV (Redundancy Version). Version), NDI (New Data Indicator), TPC (Transmit Power Control) command for scheduled PUSCH, DM RS (Demodulation Reference Signal) Cyclic shift and OCC (Orthogonal Cover Code) index, UL index, DAI (Downlink Assignment Index), CSI (Channel State Information) request, SRS ( Sounding Reference Signal, request reference, resource allocation type.
  • the information included in DCI Format 1 is: carrier indication, resource scheduling header, resource allocation, MCS level, HARQ (Hybrid Automatic Repeat Request) process number, NDI, RV, PUCCH for scheduling (Physical Uplink Share) Channel, physical uplink control channel) TPC command, DAI.
  • HARQ Hybrid Automatic Repeat Request
  • the information included in the DCI Format 1A when the C-RNT Cell Radio Network Temporary Identifier is used for scrambling is: carrier indication, format 0/1A identifier, and centralized/discrete VRB (Virtual Resource Block).
  • the allocation flag, resource allocation, preamble index, and PRACH (Physical Random Access Channel) mask the index.
  • DCI Format 1A includes when not using C-RNTI scrambling is: carrier indication, format 0/1A identification, centralized/discrete VRB allocation flag, resource allocation, MCS level, HARQ process number, NDI, RV, scheduling TPC command of PUCCH, DAI.
  • the DCI Format IB includes information: carrier indication, centralized/discrete VRB allocation flag, resource allocation, MCS level, HARQ process number, NDI, RV, TPC command for scheduled PUCCH, and DAL TPMI (Transmitted Precoding Matrix Indicator).
  • the coding matrix indicates) precoding information, PMI (Precoding Matrix Indicator) confirmation information.
  • the information included in DCI Format 1C for one PDSCH scheduling is: gap indication value, resource allocation, and MCS.
  • the information included in the DCI Format 1C for notifying the MCCH (Multicast Control Channel) change is: MCCH change notification information.
  • the DCI Format 1D includes information: carrier indication, centralized/discrete VRB allocation flag, resource allocation, MCS level, HARQ process number, NDI, RV, TPC command for scheduled PUCCH, DAL TPMI precoding information, downlink power offset .
  • the information included in DCI Format 2 includes: carrier indication, resource scheduling header, resource allocation, TPC command for scheduled PUCCH, DAI HARQ process number, transport block codeword switching flag, MCS level of transport block 1, and NDI of transport block 1.
  • the RV of the transport block 1 the MCS level of the transport block 2, the NDI of the transport block 2, the RV of the transport block 2, and the precoding information.
  • the DCI Format 2A includes information: carrier indication, resource scheduling header, resource allocation, TPC command for scheduled PUCCH, DAI HARQ process number, transport block codeword switching flag, MCS level of transport block 1, and NDI of transport block 1.
  • the DCI Format 2B includes information: carrier indication, resource scheduling header, resource allocation, TPC command for scheduled PUCCH, DAI HARQ process number, scrambling acknowledgement, SRS request, MCS level of transport block 1, and NDI of transport block 1. , RV of transport block 1, MCS level of transport block 2, NDI of transport block 2, RV of transport block 2
  • the DCI Format 2C includes information: carrier indication, resource scheduling header, resource allocation, TPC command for scheduled PUCCH, DAI HARQ process number, antenna port and scrambling acknowledgement and layer number, SRS request, and MCS level of transport block 1. , NDI of transport block 1, RV of transport block 1, MCS level of transport block 2, NDI of transport block 2, RV of transport block 2
  • DCI Format 3 includes the following information: TPC command number 1 , TPC command number 2, ... TPC command number N ( N format 0
  • Redundancy Check the number of bits before the cyclic redundancy check.
  • the information included in DCI Format 4 is: carrier indication, resource allocation, TPC command for scheduled PUSCH, DM RS cyclic shift and OCC index, UL index, antenna port and scrambling acknowledgement and layer number, DAI CSI request, SRS request , resource allocation type, MCS level of transport block 1, NDI of transport block 1, MCS level of transport block 2, NDI of transport block 2
  • the low-cost receiving antenna-limited MTC UE may have a problem of reduced coverage performance in the LTE system, and the low-cost MTC UE may not be fully used because it does not support spatial multiplexing, MIMO, and the like.
  • MIMO spatial multiplexing
  • considering the enhancement of coverage performance even if the existing partial DCI format can be applied to a low-cost MTC UE, there is a problem of excessive overhead.
  • MTC UEs Restricted for low-cost receiving antennas MTC UEs have limited coverage in LTE systems, and thus design a suitable information transmission process for low-cost MTC UEs. No effective solution has been proposed yet.
  • the technical problem to be solved by the present invention is to provide a downlink control information transmitting method and a base station, which can compensate for the coverage problem caused by the limited receiving antenna in the LTE system of the low-cost MTC terminal.
  • the present invention provides a method for transmitting downlink control information, including: a base station transmitting public information or user-specific information to a user equipment through a physical downlink shared channel (PDSCH), and downlink control information carried by the control channel (DCI) indicates, and the bandwidth occupied by the PDSCH is less than the system bandwidth.
  • a base station transmitting public information or user-specific information to a user equipment through a physical downlink shared channel (PDSCH), and downlink control information carried by the control channel (DCI) indicates, and the bandwidth occupied by the PDSCH is less than the system bandwidth.
  • DCI downlink control information carried by the control channel
  • the invention also provides a base station, including
  • the downlink control information sending unit is configured to: transmit the public information or the user-specific information to the user equipment by using a physical downlink shared channel (PDSCH), and the bandwidth occupied by the PDSCH is smaller than the system bandwidth;
  • PDSCH physical downlink shared channel
  • the indication unit is configured to: indicate downlink information or user-specific information in the PDSCH by using downlink control information (DCI) carried by the control channel.
  • DCI downlink control information
  • FIG. 1 is a diagram showing an example of a control channel supporting a low-cost MTC terminal device DCI according to an embodiment of the present invention
  • 2 is an FDD frame structure of an LTE/LTE-A system
  • 3 is a TDD frame structure of an LTE/LTE-A system
  • FIG. 5 is a block diagram of a base station according to an embodiment of the present invention. Preferred embodiment of the invention
  • the method for transmitting the downlink control information in the embodiment of the present invention is preferably applicable to a low-cost MTC UE, but does not exclude other types of UEs, and includes different sending methods, transmission modes, and corresponding control signalings of different types of information. .
  • the embodiment of the present invention provides a method for transmitting downlink control information, including:
  • the base station uses the transmit diversity transmission mode to transmit public information directly to the user equipment through the PDSCH.
  • the measurement reference signal CRS or the demodulation reference signal DMRS pilot is used in the transmit diversity transmission mode.
  • the base station sends the public information on subframe 0 and/or subframe 5.
  • the PDSCH bandwidth is smaller than the system bandwidth. Preferably, it is no more than the bandwidth for receiving access by the user equipment.
  • the frequency domain resource of the PDSCH is the full bandwidth of the access bandwidth of the user equipment, or is a predefined part of the bandwidth of the access bandwidth of the user equipment, where the user equipment includes a low-cost user equipment, or other user equipment. .
  • the base station performs power interference on the PDSCH by using a preset radio network temporary identifier RNTI.
  • the transport block size carried by the PDSCH is one of pre-defined k types, and k is a natural number.
  • the embodiment of the invention further provides a method for detecting downlink control information, including:
  • the user equipment blindly detects the physical downlink shared channel (PDSCH) carrying the public information, and obtains The public information.
  • PDSCH physical downlink shared channel
  • the PDSCH that bears the public information by the user equipment includes:
  • the user equipment blindly detects the PDSCH in subframe 0 and/or subframe 5.
  • the blind detection is blind detection in units of one or more resource blocks RB.
  • the embodiment of the invention further provides a method for sending downlink control information, including:
  • the base station transmits the public information or the user-specific information to the user equipment through the PDSCH, and indicates the downlink control information (DCI) carried by the control channel, and the bandwidth occupied by the PDSCH is smaller than the system bandwidth.
  • DCI downlink control information
  • the user equipment includes a low-cost user equipment.
  • a transmit diversity transmission mode when transmitting the public information, a transmit diversity transmission mode is used.
  • the transmit diversity transmission mode when transmitting the user-specific information, is fixedly used, or one of a single antenna port transmission and a transmit diversity transmission mode is selected.
  • a cell-specific reference signal (CRS) or a DMRS pilot is used.
  • the frequency domain resource of the PDSCH and/or the PDCCH is the full bandwidth of the user equipment access bandwidth, or is a predefined part of the bandwidth of the user equipment access bandwidth.
  • the control channel is an enhanced physical downlink control channel or a newly defined physical downlink control channel.
  • the base station sends the public information or user-specific information on a predefined subframe. For example, a subset of the set of subframes ⁇ 0, 9 ⁇ .
  • the DCI is in one of the following formats:
  • Format 1A, Format 1C The newly defined format; the format may be identified by the format 1E, and the identifier is only an example, and other identifiers different from the used DCI Format may be used as needed, which is not limited by the present invention.
  • the format of the new definition includes the following information:
  • the DCI format identifier the centralized/distributed virtual resource block VRB allocation flag bit, the resource block allocation, the MCS, the number of HARQ processes, the NDI, the TPC command to the scheduled PUCCH, the downlink allocation index, and the transmission mode identifier;
  • DCI format identifier resource block allocation, MCS, number of HARQ processes, NDI, TPC command for PUCCH for scheduling, and downlink allocation index;
  • DCI format identifier centralized/distributed VRB allocation flag bit, resource block allocation, MCS, HARQ process number, NDI, TPC command for scheduled PUCCH, downlink allocation index; or, DCI format identifier, resource block allocation, MCS, NDI, TPC command to scheduled PUCCH, downlink allocation index, and transmission mode identifier;
  • DCI format identifier centralized/distributed VRB allocation flag bit, resource block allocation, MCS, NPC pair scheduled PUCCH TPC command, downlink allocation index, and transmission mode identifier; or, DCI format identifier, resource block allocation, MCS And the NDL pairs the scheduled TPC command and the downlink allocation index of the PUCCH;
  • DCI format identification centralized/distributed VRB allocation flag bits, resource block allocation,
  • the DCI format identifier is used to indicate a DCI format
  • the transmission mode identifier is used to indicate a PDSCH transmission mode
  • the transmission mode identifier occupies 1 bit.
  • the DCI is Format 0, or is a newly defined format, and the format can use Format
  • the OA identifier is only an example, and other identifiers different from the used DCI Format may be used as needed, which is not limited by the present invention.
  • the format of this new definition includes the following information:
  • DCI format identifier resource block allocation, MCS, NDL pair scheduled physical uplink shared channel PUPC TPC command, demodulation reference signal cyclic shift DMRS CS and orthogonal cover code OCC index, uplink index number, downlink allocation index;
  • DCI format identification DCI format identification, resource block allocation, MCS, NDL, scheduling of PUSCH TPC command, DMRS CS and OCC index, uplink index number, downlink allocation index, channel status information CSI request.
  • the resource block allocation occupies "i 0 g R L 3 ⁇ 4aPl /A"' ( L 3 ⁇ 4aPl /A "+ i) / 2 ) 1 bit or ⁇ g ⁇ w ⁇ + / 2 )] bit;
  • the MCS occupies 4 bits or 3 bits or 2 bits or 1 bit.
  • the DCI format identifier occupies 1 bit.
  • the transport block size carried by the PDSCH is one of pre-defined k types, and k is a natural number.
  • the public information includes system messages, paging information, and random access feedback information.
  • the UE blindly detects the control channel, and further obtains a PDSCH carrying public information or user-specific information according to the DCI carried by the control channel;
  • the sending subframe of the public information is a predefined subframe, preferably subframe 0 and/or subframe 5, and may also be other subframes, as shown in FIG. 4, occupying subframes 1 and 6 , or, only occupy subframe 1, but not limited to these three.
  • the DCI Format supported by the newly designed low cost MTC terminal except DCI
  • Format3/3A Only UL Format MTC (also known as Format OA) / DL Format MTC (also known as Format IE)
  • the uplink transmission mode only supports the transmission mode of single antenna port transmission.
  • the resource allocation mode only supports one continuous resource allocation mode type2, and does not support frequency hopping.
  • the MCS level only supports the mode with the highest modulation order of QPSK or 16QAM.
  • the HARQ process supports up to two processes, which can be indicated by lbit. Only periodic CSI feedback or aperiodic CSI feedback is supported.
  • the N-SCID when using the single antenna port transmission mode, is a predefined value of 0 or 1.
  • N-SCID is a parameter required for one of the pilot sequence initializations used in the single antenna port transmission mode. This can be seen in section 6.10.3.1 of 3GPP Protocol 36.211.
  • the reduction of the radio frequency link removes the receiving diversity of the UE, that is, the single antenna is reserved, which directly causes the UE to reduce the coverage performance.
  • the RNTL PDSCH whose CRC scrambling is detected occupies the full bandwidth or the predefined partial bandwidth of the system, the system bandwidth is divided into n copies, and the Low Cost UE is detected by the parts.
  • Solution 1 When the system bandwidth is 1.4MHz, there are 6 RBs, which are divided into 6 parts. When the PDSCH occupies the full bandwidth and allocates 1 RB as the resource unit, the Low Cost UE performs blind detection for each RB within 6 RB.
  • Scenario 2 When the system bandwidth is 5 MHz, there are 25 RBs, which are divided into 6 parts.
  • the PDSCH occupies the predefined bandwidth of the central 6 RB and is allocated in 2 RB resource units, the Low Cost UE is blinded every 2 RBs within the predefined bandwidth. Detection.
  • Scenario 3 When the system bandwidth is 1.4MHz, there are 6 RBs, which are divided into 3 parts. When the PDSCH occupies the full bandwidth and is allocated in 2 RB resource units, the Low Cost UE performs blind detection every 2 RBs within 6 RBs.
  • the predefined bandwidth of 4 RBs is allocated in units of 2 RBs, and the Low Cost UE performs blind detection every 2 RBs within 4 RBs.
  • Scenario 5 When the system bandwidth is 1.4MHz, there are 6 RBs, which are divided into 1 parts, that is, the PDSCH is allocated in units of 6 RBs, and the Low Cost UE is blindly tested every 6 RBs.
  • the transmission mode supported by the low-cost MTC terminal it is the transmission mode of the transmission diversity, or the transmission mode of the transmission mode of the single antenna port and the transmission mode of the transmission diversity.
  • the downlink control information format DCI Format IE is used to indicate the transmission mode, as shown in Table 1 or 2. Shown. When the transmission mode including the transmission mode of the single antenna port and the transmission mode of the transmission diversity is used, an increase of lbit is added to the DCI Format IE to distinguish.
  • Table 1 PDCCH and PDSCH configured by C-RNTI or SPS-R TI Common and
  • Mode X DCI format IE C-RNTI or SPS-RNTI defines transmit diversity
  • the downlink control information format DCI Format OA is used to indicate the transmission mode, as shown in Table 3. .
  • Table 3 PDCCH and PDSCH configured by C-RNTI or SPS-RNTI
  • the transmission subframe of the public information when the public information is transmitted, preferably includes subframe 0 and or subframe 5 but is not limited thereto; when transmitting the proprietary information, transmitting the PDCCH
  • the subframe is a predefined subframe, for example, a subset of the subframe ⁇ 0, 9 ⁇ set.
  • the subframe for the control channel corresponding to the transmission of the proprietary information is all ten subframes within one frame, that is, ⁇ 0, 9 ⁇ , or any one or more subframes within one frame, suitable for each sub-frame. Dynamic scheduling of frames.
  • the subframe for the control channel corresponding to the transmission of the proprietary information is five subframes within one frame, such as ⁇ 0, 2, 4, 6, 8 ⁇ or ⁇ 1, 3, 5, 7, 9 ⁇ , Suitable for cross-frame scheduling.
  • the MCS level corresponding to the transport block size of the PDSCH bearer is a predefined k type, and k is a natural number.
  • the value set of k is ⁇ 1. 2, 4, 8 ⁇ ;
  • the limit is 16QAM modulation mode, the value set of k is ⁇ 1, 2, 4, 8, 16 ⁇ ;
  • the MCS level is not limited, the value of k is 32;
  • the transport block size For the predefined k types, the possible values are ⁇ 1, 2, 4, 8 ⁇ , and the modulation mode is fixed to one of QPSK or 16QAM.
  • the MCS level is expressed in 4 bits, for a total of 16 cases. For example, as shown in Table 4. Others in the existing MCS level 0-16 a total of 17 combinations of 16 combinations are included.
  • the MCS level is expressed in 3 bits, for a total of 8 cases. For example: As shown in Table 5. Others in the existing MCS level 0-16 a total of 17 selected combinations of 8 are included.
  • the MCS level is expressed in 2 bits, and there are 4 cases. For example: As shown in Table 6. Others in the existing MCS level 0-16 a total of 17 kinds of combinations are included in 4 combinations.
  • the MCS level is represented by lbit, and there are two cases. For example: As shown in Table 7. Others in the existing MCS level 0-16 a total of 17 kinds of combinations are included.
  • the MCS level bit field is not used, that is, only one MCS level is supported. For example: As shown in Table 8. Others in the existing MCS level 0-16 a total of 17 selected one of the combinations are included.
  • the MCS level is expressed in 3 bits, for a total of 8 cases. For example: As shown in Table 9. Others are included in the existing MCS level. 0-9 A total of 10 combinations are included.
  • the MCS level is expressed in 2 bits, for a total of 4 cases. For example: As shown in Table 10, among the existing MCS grades, there are 10 combinations of 10 to choose 4 of them.
  • the MCS level is represented by lbit, which is a total of two cases. For example: As shown in Table 11, the other in the existing MCS level 0-9 a total of 10 kinds of combinations are included.
  • the MCS level bit field is not used, that is, only one MCS level is supported. For example: As shown in Table 12. Others in the existing MCS level 0-9 a total of 10 selected one of the combinations are included.
  • the HARQ process number bit field is not used, that is, only one HARQ process is supported. This kind of consideration is mainly for the convenience of operation, and all users use one process.
  • the DCI format OA and DCI format IE corresponding to the transmission mode used by the low-cost MTC terminal are as follows.
  • Each field (if any, padded 0 bits are also included) is mapped in the order in which they appear, with the first field mapped to the lowest information bit ⁇ .
  • the next field is mapped to a high information bit.
  • the most significant bit of each field maps to the lowest information bit of the corresponding field, for example, the most significant bit of the first field maps to ⁇ . .
  • the DCI format 0 ⁇ , 1 ⁇ , 3, and 3 ⁇ have the same load size.
  • DCI format OA is used for PUSCH scheduling.
  • the following information is transmitted via the DCI format OA:
  • format 0A If the number of information bits of format 0A is less than the payload size of format 1E (including any padding bits added to format 1E), format 0A must be padded with 0 until the payload size is equal to the payload size of format 1E.
  • Format IE IE
  • the DCI format IE is used for a PDSCH codeword and a compression schedule for a random access procedure initiated by a PDCCH order.
  • the format 1E is used for the random access procedure initiated by the PDCCH order, and the remaining fields are set as follows:
  • 0 means single antenna port transmission
  • 1 means transmission diversity transmission mode (when only the transmit diversity transmission mode is supported, there is no such bit field).
  • 1 may indicate a single antenna port transmission
  • 0 indicates a transmission diversity transmission mode, which is not limited by the present invention.
  • format and transmission mode identifiers distinguished by format 0A and format 1E can also use 2 bits.
  • the manner of the joint coding is indicated, and the present invention does not limit this.
  • format 1E If the number of information bits in format 1E is less than the payload size of the format OA (including any padding bits added to the format OA), format 1E must be padded with 0 until the payload size is equal to the payload size of the format OA.
  • the fields defined below in the DCI format for low cost MTC UEs correspond to information bits ⁇ ⁇ to a Al.
  • Each field (if any, padded 0 bits are also included) is mapped in the order in which they appear, with the first field mapped to the lowest information bit ⁇ .
  • the next field is mapped to a high information bit.
  • the most significant bit of each field maps to the lowest information bit of the corresponding field, for example, the most significant bit of the first field maps to ⁇ . .
  • the DCI format 0 ⁇ , 1 ⁇ , 3, and 3 ⁇ have the same load size.
  • DCI format OA is used for PUSCH scheduling.
  • the following information is transmitted via the DCI format OA:
  • the DCI format IE is used for a PDSCH codeword and a compression schedule for a random access procedure initiated by a PDCCH order.
  • - Transmission mode identification - lbit 0 means single antenna port transmission
  • 1 means transmission diversity transmission mode (when only the transmit diversity transmission mode is supported, there is no such bit field). If the number of information bits in format 1E is less than the payload size of format 0A (including any Added to the padding bits of the format OA), Format 1E must be padded with 0 until the payload size is equal to the payload size of the format OA.
  • the fields defined below in the DCI format for low cost MTC UEs correspond to information bits ⁇ ⁇ to a Al .
  • Each field (if any, padded 0 bits are also included) is mapped in the order in which they appear, with the first field mapped to the lowest information bit ⁇ .
  • the next field is mapped to a high information bit.
  • the most significant bit of each field maps to the lowest information bit of the corresponding field, for example, the most significant bit of the first field maps to ⁇ . .
  • the DCI format 0 ⁇ , 1 ⁇ , 3, and 3 ⁇ have the same load size.
  • DCI format OA is used for PUSCH scheduling.
  • the following information is transmitted via the DCI format OA:
  • format 0A If the number of information bits in format 0A is less than the payload size of format 1E (including any padding bits added to format 1E), format 0A must be padded with 0 until the payload size is equal to the cell size The payload size of the IE.
  • the DCI format IE is used for a PDSCH codeword and a compression schedule for a random access procedure initiated by a PDCCH order.
  • Format 1A is used for the random access procedure initiated by the PDCCH order, and the remaining fields are set as follows:
  • - Transmission mode identification - lbit 0 means single antenna port transmission
  • 1 means transmission diversity transmission mode (when only the transmit diversity transmission mode is supported, there is no such bit field). If the number of information bits in format 1E is less than the payload size of format OA (including any Added to the padding bits of the format OA), Format 1E must be padded with 0 until the payload size is equal to the payload size of the format OA.
  • Each field (if any, padded 0 bits are also included) is mapped in the order in which they appear, with the first field mapped to the lowest information bit ⁇ .
  • the next field is mapped to a high information bit.
  • the most significant bit of each field maps to the lowest information bit of the corresponding field, for example, the most significant bit of the first field maps to ⁇ . .
  • the DCI format 0 ⁇ , 1 ⁇ , 3, and 3 ⁇ have the same load size.
  • DCI format OA is used for PUSCH scheduling.
  • the following information is transmitted via the DCI format OA:
  • N gapl is defined in 36.211, and N is defined in 36.213.
  • the DCI format IE is used for a PDSCH codeword and a compression schedule for a random access procedure initiated by a PDCCH order.
  • Format 1A is used for the random access procedure initiated by the PDCCH order, and the remaining fields are set as follows:
  • - Transmission mode identification - lbit 0 means single antenna port transmission
  • 1 means transmission diversity transmission mode (when only the transmit diversity transmission mode is supported, there is no such bit field). If the number of information bits in format 1E is less than the payload size of format OA (including any Added to the padding bits of the format OA), Format 1E must be padded with 0 until the payload size is equal to the payload size of the format OA.
  • the fields defined below in the DCI format for low cost MTC UEs correspond to information bits ⁇ ⁇ to a Al.
  • Each field (if any, padded 0 bits are also included) is mapped in the order in which they appear, with the first field mapped to the lowest information bit ⁇ .
  • the next field is mapped to a high information bit.
  • the most significant bit of each field maps to the lowest information bit of the corresponding field, for example, the most significant bit of the first field maps to ⁇ . .
  • the DCI format 0 ⁇ , 1 ⁇ , 3, and 3 ⁇ have the same load size.
  • DCI format OA is used for PUSCH scheduling.
  • the following information is transmitted via the DCI format OA:
  • N gapl is defined in 36.211, and N is defined in 36.213.
  • the DCI format IE is used for a PDSCH codeword and a compression schedule for a random access procedure initiated by a PDCCH order.
  • Format 1A is used for the random access procedure initiated by the PDCCH order, and the remaining fields are set as follows:
  • - Transmission mode identification - lbit 0 means single antenna port transmission
  • 1 means transmission diversity transmission mode (when only the transmit diversity transmission mode is supported, there is no such bit field). If the number of information bits in format 1E is less than the payload size of format OA (including any Added to the padding bits of the format OA), Format 1E must be padded with 0 until the payload size is equal to the payload size of the format OA.
  • the fields defined below in the DCI format for low cost MTC UEs correspond to information bits ⁇ ⁇ to a Al.
  • Each field (if any, padded 0 bits are also included) is mapped in the order in which they appear, with the first field mapped to the lowest information bit ⁇ .
  • the next field is mapped to a high information bit.
  • the most significant bit of each field maps to the lowest information bit of the corresponding field, for example, the most significant bit of the first field maps to ⁇ . .
  • the DCI format 0 ⁇ , 1 ⁇ , 3, and 3 ⁇ have the same load size.
  • DCI format OA is used for PUSCH scheduling.
  • the following information is transmitted via the DCI format OA:
  • N gapl is defined in 36.211, and N is defined in 36.213.
  • the DCI format IE is used for a PDSCH codeword and a compression schedule for a random access procedure initiated by a PDCCH order.
  • Format 1A is used for the random access procedure initiated by the PDCCH order, and the remaining fields are set as follows:
  • - Transmission mode identification - lbit 0 means single antenna port transmission
  • 1 means transmission diversity transmission mode (when only the transmit diversity transmission mode is supported, there is no such bit field). If the number of information bits in format 1E is less than the payload size of format OA (including any padding bits added to format OA), format 1E must be padded with 0 until the payload size is equal to the cell size The payload size of the OA.
  • Each field (if any, padded 0 bits are also included) is mapped in the order in which they appear, with the first field mapped to the lowest information bit ⁇ .
  • the next field is mapped to a high information bit.
  • the most significant bit of each field maps to the lowest information bit of the corresponding field, for example, the most significant bit of the first field maps to ⁇ . .
  • the DCI format 0 ⁇ , 1 ⁇ , 3, and 3 ⁇ have the same load size.
  • DCI format OA is used for PUSCH scheduling.
  • the following information is transmitted via the DCI format OA:
  • N gapl is defined in 36.211, and N is defined in 36.213.
  • the DCI format IE is used for a PDSCH codeword and a compression schedule for a random access procedure initiated by a PDCCH order.
  • Format 1A is used for the random access procedure initiated by the PDCCH order, and the remaining fields are set as follows:
  • - Transmission mode identification - lbit 0 means single antenna port transmission
  • 1 means transmission diversity transmission mode (when only the transmit diversity transmission mode is supported, there is no such bit field). If the number of information bits in format 1E is less than the payload size of format OA (including any How to add padding bits to the format OA), the format IE must be padded with 0 until the payload size is equal to the payload size of the format OA.
  • the information is only carried by the PDSCH and does not pass the PDCCH indication.
  • the system information is carried in the PDSCH, and is transmitted in subframes 0 and 5, using QPSK modulation, and the used TBS is one of k types, occupying 2 RBs of bandwidth in full bandwidth, and adopting transmission mode of transmission diversity.
  • the UE When the UE receives the public information, it performs blind detection in subframes 0 and 5. The UE detects whether the information is sent to itself according to the RNTI scrambled by the CRC attached to the message, and performs blind detection in units of 2 RBs in the search space in the entire bandwidth, and sequentially detects the number of the six RBs as ⁇ 1, 2 ⁇ . RBs of ⁇ 3, 4 ⁇ , ⁇ 5, 6 ⁇ are detected in the third group, and then k kinds of TBSs are detected in the RB numbers ⁇ 5, 6 ⁇ .
  • the information is carried only by using the PDSCH and does not pass the PDCCH indication.
  • the public information is carried in the PDSCH, and is transmitted in subframes 0 and 5, using QPSK modulation, and the used TBS is one of k types, occupying 2 RBs of bandwidth in a predefined bandwidth of 4 RBs, and using transmit diversity. Transfer mode.
  • the UE When the UE receives the public information, it performs blind detection in subframes 0 and 5. The UE detects whether it is the information sent to itself according to the RNTI scrambled by the CRC attached to the message, and then performs blind detection in units of 2 RB in the search space within the predefined bandwidth.
  • the applicable modulation scheme may be other than BPSK, 16QAM, etc. in addition to QPSK; the occupied RBs may be 1, 2, 3, 4, 5, 6 RBs or more but less than 50 RBs;
  • the combination of RBs can be multiple, and 6 RBs (or RB values corresponding to other bandwidths) are selected.
  • Embodiment 2 in addition to the above, there are also predefined bandwidths of X RBs, x being 1, 2, ..., 6 RBs or more but less than the system bandwidth.
  • the PDSCH is used to carry the information and is indicated by the DCI carried by the PDCCH.
  • the public information is carried in the PDSCH, and is transmitted in subframes 0 and 5, using QPSK modulation, and the used TBS is one of k types, occupying 1 RB bandwidth in full bandwidth 6 RB, and transmitting transmission diversity. mode.
  • the UE When receiving the public information, the UE performs blind detection of the PDCCH in subframes 0 and 5. The UE detects whether the information is sent to itself according to the RNTI scrambled by the CRC attached to the message, and then performs blind detection detection of the DCI Format 1A according to the CCE aggregation level in the common search space in the full bandwidth, and obtains the DCI and then obtains the PDSCH. Public information.
  • the configuration of the transfer mode at this time is:
  • the PDSCH is used to carry the information and is indicated by the Compact DCI carried by the ePDCCH.
  • the public information is carried in the PDSCH, and is transmitted in subframes 0 and 5, using QPSK modulation, and the used TBS is one of k types, occupying 2 RBs of bandwidth in full bandwidth 6 RB, and transmitting transmission diversity. mode.
  • the UE When receiving the public information, the UE performs blind detection of the ePDCCH in subframes 0 and 5. The UE detects whether the information is sent to itself according to the RNTI scrambled by the CRC attached to the message, and then performs blind detection detection of the DCI Format IE according to the 2RB in the common search space in the full bandwidth, and obtains the DCI and then obtains the PDSCH. Public information.
  • the configuration of the transfer mode at this time is: UE downlink transmission mode PDCCH corresponding PDSCH
  • the DCI format IE is used for a PDSCH codeword and a compression schedule for a random access procedure initiated by a PDCCH order.
  • format 1E If the number of information bits in format 1E is less than the payload size of format 0A (including any padding bits added to format 0A), format 1E must be padded with 0 until the payload size is equal to the payload size of format 0A.
  • This embodiment can be modified as follows: different DCI configurations are used; DCI format IE is configured with different number of bits; the number of RBs occupied by the PDSCH can be 1 2 3 4 5 6 RBs or more but less than the system bandwidth; The number of RBs can be 1, 2, 4 8RB
  • the PDSCH is used to carry the information and is indicated by the DCI carried by the PDCCH.
  • the proprietary information is carried in the PDSCH and is transmitted in the predefined subframes 0 to 9.
  • the modulation mode is not limited.
  • the TBS used is one of the k types, and the bandwidth of one RB is occupied in the full bandwidth 6 RB. Send the transmission mode of the diversity.
  • the UE When receiving the private information, the UE performs blind detection in the predefined subframes 0 to 9.
  • the RN UE detects whether the information is sent to itself according to the RNTI scrambled by the CRC appended by the message, and then the proprietary search space in the full bandwidth.
  • the DCI Format 1A is blindly detected according to the CCE aggregation level, and the DCI is obtained to obtain the proprietary information in the PDSCH.
  • the configuration of the transfer mode at this time is:
  • the configuration of the DCI Format IE is:
  • the DCI format IE is used for a PDSCH codeword and a compression schedule for a random access procedure initiated by a PDCCH order.
  • format 1E If the number of information bits in format 1E is less than the payload size of the format OA (including any padding bits added to the format OA), format 1E must be padded with 0 until the payload size is equal to the payload size of the format OA.
  • the PDSCH is used to carry the information and is indicated by the Compact DCI carried by the PDCCH.
  • the proprietary information is carried in the PDSCH, and is transmitted in the predefined subframes 0 to 9.
  • the QPSK modulation is used, and the used TBS is one of the k types, occupying 1 RB bandwidth in the full bandwidth 6 RB.
  • the transmission mode of the antenna port is carried in the PDSCH, and is transmitted in the predefined subframes 0 to 9.
  • the QPSK modulation is used, and the used TBS is one of the k types, occupying 1 RB bandwidth in the full bandwidth 6 RB.
  • the UE When receiving the proprietary information, the UE performs blind detection of the PDCCH in the predefined subframes 0 to 9. The UE detects whether the information is sent to itself according to the RNTI scrambled by the CRC attached to the message, and then performs blind detection of the DCI Format IE in units of 1 RB in a dedicated search space in the full bandwidth, and obtains the DCI and then obtains the PDSCH.
  • Proprietary information is used to the proprietary information.
  • the configuration of the transfer mode at this time is:
  • the configuration of the DCI Format IE is:
  • the DCI format IE is used for one PDSCH codeword and compression scheduling of a random access procedure initiated by one PDCCH order.
  • the following information is transmitted via the DCI format IE:
  • Transmission mode identification - lbit 0 means single antenna port transmission, 1 means transmission diversity
  • format 1E If the number of information bits in format 1E is less than the payload size of format OA (including any padding bits added to format OA), format 1E must be padded with 0 until the payload size is equal to the payload size of format 0A.
  • the PDSCH is used to carry the information and is indicated by the Compact DCI carried by the ePDCCH.
  • the proprietary information is carried in the PDSCH, and is transmitted in the predefined subframes ⁇ 0, 2, 4, 6, 8 ⁇ , using 16QAM modulation, and the used TBS is one of the k types, occupying 2 in the full bandwidth 6RB.
  • the bandwidth of the RBs is the transmission mode of the transmit diversity.
  • the UE When receiving the proprietary information, the UE performs blind detection of the ePDCCH in the predefined subframes ⁇ 0, 2, 4, 6, 8 ⁇ . The UE detects whether the information is sent to itself according to the RNTI scrambled by the CRC attached to the message, and then performs blind detection of the DCI Format IE according to the 2RB in the dedicated search space in the full bandwidth, and obtains the DCI and then obtains the PDSCH.
  • Proprietary information Proprietary information.
  • the configuration of the transfer mode at this time is: UE downlink transmission mode PDCCH corresponding PDSCH
  • port mode X DCI format IE or SPS-RNTI defined
  • the configuration of the DCI Format IE at this time is:
  • the DCI format IE is used for a PDSCH codeword and a compression schedule for a random access procedure initiated by a PDCCH order.
  • - Transmission mode identification - lbit 0 means single antenna port transmission
  • 1 means transmission diversity transmission mode (when only the transmit diversity transmission mode is supported, there is no such bit field). If the number of information bits of format 1E is less than the payload size of format OA (including any padding bits added to format OA), format 1E must be padded with 0 until the payload size is equal to the payload size of format OA.
  • Example 8 If the number of information bits of format 1E is less than the payload size of format OA (including any padding bits added to format OA), format 1E must be padded with 0 until the payload size is equal to the payload size of format OA.
  • the PDSCH is used to carry the information and is indicated by the DCI carried by the PDCCH.
  • the proprietary information is carried in the PDSCH, and is transmitted in the predefined subframes 0 to 9.
  • the TBS used is one of the k types, and the bandwidth of the two RBs is occupied in the full bandwidth 6 RB.
  • the UE When receiving the proprietary information, the UE performs blind detection of the PDCCH in the predefined subframes 0 to 9. The UE detects whether the information is sent to itself according to the RNTI scrambled by the CRC attached to the message, and then blindly detects the DCI Format OA according to the CCE aggregation level in the proprietary search space in the full bandwidth, and obtains the DCI and then obtains the PDSCH.
  • Proprietary information Proprietary information.
  • the configuration of the transfer mode at this time is:
  • DCI format OA is used for PUSCH scheduling.
  • the following information is transmitted via the DCI format OA:
  • Modulation coding scheme - 3 bits see the description of the MCS level in the specific implementation.
  • the new data indicates one-to-one bits.
  • format OA If the number of information bits in the format OA is less than the payload size of format 1E (including any padding bits added to format 1E), format OA must be padded with 0 until the payload size is equal to the payload size of format 1E.
  • This embodiment can be modified as follows: different DCI configurations are used; DCI format IE configuration of different number of bits; DCI format OA configuration of different number of bits; number of RBs occupied by PDSCH can be 1, 2, 3, 4, 5 6 RBs or more but less than the system bandwidth; the number of RBs occupied by the ePDCCH may be 1, 2, 4, 8 RB; different transmission mode settings; the predefined subframe may be any combination of 0 to 9;
  • the public information and the user-specific information may be transmitted in the same subframe and/or different subframes.
  • the embodiment of the present invention further provides a base station, as shown in FIG. 5, including:
  • a downlink control information sending unit configured to transmit public information or user-specific information to the user equipment by using a physical downlink shared channel (PDSCH), and the bandwidth occupied by the PDSCH is smaller than a system bandwidth;
  • PDSCH physical downlink shared channel
  • an indication unit configured to indicate public information or user-specific information in the PDSCH by using downlink control information (DCI) carried by the control channel.
  • DCI downlink control information
  • the DCI format refers to the method embodiment.
  • the transmit diversity transmission mode is used.
  • the downlink control information sending unit uses the transmit diversity transmission mode fixedly when transmitting the user-specific information, or selects one of a single antenna port transmission and a transmit diversity transmission mode. Kind.
  • the downlink control information sending unit transmits the information by using a transmit diversity transmission mode.
  • the cell-specific reference signal CRS or the demodulation reference signal DMRS pilot is used.
  • the frequency domain resource of the PDSCH and/or the PDCCH is the full bandwidth of the user equipment access bandwidth, or is a predefined part of the bandwidth of the user equipment access bandwidth.
  • the control channel is an enhanced physical downlink control channel or a newly defined physical downlink control channel.
  • the downlink control information sending unit sends the public information or user-specific information in a predefined subframe.
  • the transport block size carried by the PDSCH is one of pre-defined k types, and k is a natural number.
  • the public information is directly transmitted in the PDSCH by removing the DCI, and the UE directly detects the PDSCH to obtain the public information, so as to prevent the UE from receiving the PDCCH control information due to the limited bandwidth, and the PDSCH cannot be detected and the public information cannot be obtained.
  • the problem is that, in addition to DCI, the control information overhead is saved.
  • the PDSCH is transmitted using a small bandwidth, which facilitates UE reception.
  • the size of the DCI Format is reduced by the Compact DCI Format, thereby reducing control information and improving coverage performance.

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Abstract

Procédé de transmission d'informations de commande de liaison descendante ; une station de base transmet des informations publiques ou des informations dédiées à un utilisateur vers un équipement utilisateur par l'intermédiaire d'un canal partagé de liaison descendante physique (PDSCH) et donne des instructions via les informations de commande de liaison descendante (DCI) portées sur un canal de commande, la bande passante occupée par le PDSCH étant inférieure à celle du système. L'invention concerne également une station de base.
PCT/CN2012/087354 2012-01-21 2012-12-25 Procédé de transmission d'informations de commande de liaison descendante et station de base WO2013107250A1 (fr)

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CN111316739A (zh) * 2017-11-08 2020-06-19 三星电子株式会社 用于未许可频谱中的波束管理的方法和装置
CN113302963A (zh) * 2019-01-15 2021-08-24 上海诺基亚贝尔股份有限公司 利用信令消息调度服务小区
CN115052354A (zh) * 2019-03-29 2022-09-13 中兴通讯股份有限公司 传输方法、装置、设备、系统和存储介质
WO2020199031A1 (fr) * 2019-03-29 2020-10-08 华为技术有限公司 Procédé et appareil de communication
CN115052354B (zh) * 2019-03-29 2024-02-13 中兴通讯股份有限公司 传输方法、装置、设备、系统和存储介质
CN110519850B (zh) * 2019-08-23 2021-11-09 北京紫光展锐通信技术有限公司 传输带宽确定方法及装置
CN110519850A (zh) * 2019-08-23 2019-11-29 北京展讯高科通信技术有限公司 传输带宽确定方法及装置

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