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WO2018028397A1 - Procédé de mise en correspondance de ressources utilisé dans une démodulation de signal de référence, station de base, terminal et support de mémorisation de données - Google Patents

Procédé de mise en correspondance de ressources utilisé dans une démodulation de signal de référence, station de base, terminal et support de mémorisation de données Download PDF

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Publication number
WO2018028397A1
WO2018028397A1 PCT/CN2017/093412 CN2017093412W WO2018028397A1 WO 2018028397 A1 WO2018028397 A1 WO 2018028397A1 CN 2017093412 W CN2017093412 W CN 2017093412W WO 2018028397 A1 WO2018028397 A1 WO 2018028397A1
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WIPO (PCT)
Prior art keywords
subcarrier
ofdm symbol
dmrs
ofdm
selecting
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Ceased
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PCT/CN2017/093412
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English (en)
Chinese (zh)
Inventor
林祥利
高雪娟
潘学明
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China Academy of Telecommunications Technology CATT
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China Academy of Telecommunications Technology CATT
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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
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA

Definitions

  • the present disclosure relates to the technical field of communication applications, and in particular, to a resource mapping method for demodulating reference signals, a base station, a terminal, and a storage medium.
  • TTI Transmission Time Interval
  • LTE Long Term Evolution
  • DMRS DeModulation Reference Signal
  • An object of the present disclosure is to provide a resource mapping method, a base station, and a terminal for demodulating a reference signal, which are used to solve the problem that when the TTI length is shortened, the original pilot mapping manner cannot include DMRS in each TTI, thereby affecting the channel. Estimate performance issues.
  • the present disclosure provides a resource mapping method for demodulating a reference signal, include:
  • each short transmission time interval TTI selecting at least one orthogonal frequency division multiplexing OFDM symbol that does not map the common pilot CRS;
  • a demodulation reference signal DMRS is mapped in the selected OFDM symbol.
  • the length of the short TTI is the length of time corresponding to two OFDM symbols, in each of the short TTIs, one OFDM symbol of the unmapped CRS is selected.
  • the step of selecting an OFDM symbol that does not map the CRS includes:
  • each subframe includes 14 OFDM symbols, selecting a third OFDM symbol and a thirteenth OFDM symbol in each of the subframes; or
  • a fourteenth OFDM symbol is selected in each of the subframes.
  • the number of antenna ports of the DMRS is up to 4.
  • mapping is performed in the second subcarrier, the third subcarrier, the eighth subcarrier, and the ninth subcarrier in each selected OFDM symbol.
  • DMRS Downlink Reference Signal
  • the first subcarrier, the second subcarrier, and the ninth in each selected OFDM symbol The DMRS is mapped in the subcarrier and the 10th subcarrier.
  • the number of antenna ports of the DMRS is up to 8.
  • the first subcarrier In the first subcarrier, the second subcarrier, the fourth subcarrier, the fifth subcarrier, the seventh subcarrier, the eighth subcarrier, the eleventh subcarrier, and the twelfth subcarrier in each selected OFDM symbol Map DMRS; or
  • the second subcarrier In the first subcarrier, the second subcarrier, the third subcarrier, the fourth subcarrier, the ninth subcarrier, the tenth subcarrier, the eleventh subcarrier, and the twelfth subcarrier in each selected OFDM symbol Map DMRS.
  • the length of the short TTI is the length of time corresponding to the seven OFDM symbols, at least one orthogonal frequency division multiplexing OFDM symbol that does not map the common pilot CRS is selected according to the maximum value of the number of antenna ports of the DMRS.
  • the orthogonal frequency division of at least one unmapped common pilot CRS is selected according to the maximum value of the number of antenna ports of the DMRS.
  • the steps of using OFDM symbols include:
  • the number of antenna ports of the DMRS is at most 4, in each of the short TTIs, at least one OFDM symbol that does not map the common pilot CRS is selected.
  • the step of selecting at least one OFDM symbol that does not map the common pilot CRS includes:
  • a sixth OFDM symbol is selected.
  • the 7th OFDM symbol is selected.
  • the orthogonal frequency division of at least one unmapped common pilot CRS is selected according to the maximum value of the number of antenna ports of the DMRS.
  • the steps of using OFDM symbols include:
  • the number of antenna ports of the DMRS is at most 8, in each of the short TTIs, at least two OFDM symbols not mapped with a common pilot CRS are selected.
  • the step of selecting at least two OFDM symbols that do not map the common pilot CRS in each of the short TTIs includes:
  • a sixth OFDM symbol and a seventh OFDM symbol are selected.
  • DMRS subcarrier mapping demodulation reference signals
  • the second subcarrier, the third word carrier, the eighth subcarrier, and the ninth subcarrier mapping demodulation reference signal DMRS are selected in each selected OFDM symbol.
  • an embodiment of the present disclosure further provides a base station, including:
  • a first selecting module configured to: in each short transmission time interval TTI, select at least one orthogonal frequency division multiplexing OFDM symbol that does not map the common pilot CRS;
  • mapping module configured to map a demodulation reference signal DMRS in the selected OFDM symbol, and Send the DMRS.
  • the first selection module includes:
  • a first selecting submodule configured to select, in each of the short TTIs, an OFDM symbol that is not mapped to the CRS, if the length of the short TTI is a length of time corresponding to two OFDM symbols.
  • the first selecting submodule is configured to select a third OFDM symbol and a thirteenth OFDM symbol in each of the subframes if each subframe includes 14 OFDM symbols; or
  • a fourteenth OFDM symbol is selected in each of the subframes.
  • the mapping module includes:
  • a first mapping sub-module where the number of antenna ports for the DMRS is at most 4 and 1 resource block RB or 12 sub-carriers are used as a unit in the frequency domain, and then 2nd in each selected OFDM symbol Mapping DMRSs in subcarriers, 3rd subcarriers, 8th subcarriers, and 9th subcarriers; or
  • the DMRS is mapped in the first subcarrier, the second subcarrier, the ninth subcarrier, and the tenth subcarrier in each selected OFDM symbol.
  • the mapping module includes:
  • a second mapping submodule where the number of antenna ports for the DMRS is at most 8 and one RB or 12 subcarriers are used as a unit in the frequency domain, and then the second subcarrier in each selected OFDM symbol Mapping the DMRS in the third subcarrier, the fourth subcarrier, the fifth subcarrier, the eighth subcarrier, the ninth subcarrier, the tenth subcarrier, and the eleventh subcarrier; or
  • the first subcarrier In the first subcarrier, the second subcarrier, the fourth subcarrier, the fifth subcarrier, the seventh subcarrier, the eighth subcarrier, the eleventh subcarrier, and the twelfth subcarrier in each selected OFDM symbol Map DMRS; or
  • the second subcarrier In the first subcarrier, the second subcarrier, the third subcarrier, the fourth subcarrier, the ninth subcarrier, the tenth subcarrier, the eleventh subcarrier, and the twelfth subcarrier in each selected OFDM symbol Map DMRS.
  • the first selection module includes:
  • a second selecting submodule configured to: if the length of the short TTI is a length of time corresponding to seven OFDM symbols, select at least one unmapped common pilot CRS according to a maximum value of the number of antenna ports of the DMRS The frequency division is divided into OFDM symbols.
  • the second selection submodule includes:
  • the first selecting unit is configured to: if each of the short TTIs selects at least one OFDM symbol that does not map the common pilot CRS, if the number of antenna ports of the DMRS is at most 4.
  • the first selecting unit is configured to select a third OFDM symbol and a sixth OFDM symbol in each of the short TTIs;
  • a sixth OFDM symbol is selected.
  • the 7th OFDM symbol is selected.
  • the second selection submodule includes:
  • a second selecting unit configured to select at least two OFDM symbols that do not map the common pilot CRS in each of the short TTIs, if the number of antenna ports of the DMRS is at most 8.
  • the second selecting unit is configured to select, in each of the short TTIs, a third OFDM symbol, a fourth OFDM symbol, a sixth OFDM symbol, and a seventh OFDM symbol; or
  • the mapping module includes:
  • a third mapping submodule configured to select one or two adjacent four subcarrier mapping demodulation reference signals DMRS in each selected OFDM symbol if one RB or 12 subcarriers are used as a unit in the frequency domain, Each of the selected subcarriers occupies the same frequency domain position in different OFDM symbols.
  • the third mapping submodule is configured to select a second subcarrier, a third word carrier, an eighth subcarrier, and a ninth subcarrier mapping demodulation reference signal DMRS in each selected OFDM symbol.
  • an embodiment of the present disclosure further provides a terminal, including:
  • a second selecting module configured to: in each short transmission time interval TTI, select at least one orthogonal frequency division multiplexing OFDM symbol that does not map the common pilot CRS;
  • an obtaining module configured to obtain, in the selected OFDM symbol, a demodulation reference signal DMRS sent by the base station.
  • the second selection module includes:
  • a third selection submodule configured to select, in each of the short TTIs, an OFDM symbol that is not mapped to the CRS, if the length of the short TTI is a length of time corresponding to two OFDM symbols.
  • the third selecting submodule is configured to select a third OFDM symbol and a thirteenth OFDM symbol in each of the subframes if each subframe includes 14 OFDM symbols; or
  • a fourteenth OFDM symbol is selected in each of the subframes.
  • the obtaining module includes:
  • a first obtaining submodule where the number of antenna ports for the DMRS is up to 4 and in a frequency domain
  • the DMRS sent by the base station is obtained in the first subcarrier, the second subcarrier, the ninth subcarrier, and the tenth subcarrier in each selected OFDM symbol.
  • the obtaining module includes:
  • a second obtaining submodule where the number of antenna ports for the DMRS is at most 8 and 1 RB or 12 subcarriers are used as a unit in the frequency domain, and then the second subcarrier in each selected OFDM symbol Obtaining, by the third subcarrier, the fourth subcarrier, the fifth subcarrier, the eighth subcarrier, the ninth subcarrier, the tenth subcarrier, and the eleventh subcarrier, a DMRS sent by the base station; or
  • the DMRS sent by the base station Obtaining the DMRS sent by the base station;
  • the DMRS sent by the base station.
  • the second selection module includes:
  • a fourth selecting submodule configured to: if the length of the short TTI is a length of time corresponding to seven OFDM symbols, select at least one unmapped common pilot CRS according to a maximum value of the number of antenna ports of the DMRS.
  • the frequency division is divided into OFDM symbols.
  • the fourth selection submodule includes:
  • a third selecting unit configured to: if each of the short TTIs selects at least one OFDM symbol that does not map the common pilot CRS, if the number of antenna ports of the DMRS is at most 4.
  • the third selecting unit is configured to select a third OFDM symbol and a sixth OFDM symbol in each of the short TTIs;
  • a sixth OFDM symbol is selected.
  • the 7th OFDM symbol is selected.
  • the fourth selection submodule includes:
  • a fourth selecting unit configured to: if each of the short TTIs selects at least two OFDM symbols that do not map the common pilot CRS, if the number of antenna ports of the DMRS is at most 8.
  • the fourth selecting unit is configured to select, in each of the short TTIs, a third OFDM symbol, a fourth OFDM symbol, a sixth OFDM symbol, and a seventh OFDM symbol; or
  • the obtaining module includes:
  • a third obtaining submodule configured to: if one RB or 12 subcarriers are used as a unit in the frequency domain, select two adjacent four subcarriers in each selected OFDM symbol to obtain a demodulation reference sent by the base station A signal DMRS, wherein each of the selected subcarriers occupies the same frequency domain position in different OFDM symbols.
  • the third obtaining submodule is configured to select a second subcarrier, a third word carrier, an eighth subcarrier, and a ninth subcarrier in each selected OFDM symbol to obtain a demodulation reference signal DMRS sent by the base station. .
  • the embodiment of the present disclosure further provides a base station, including:
  • transceiver for receiving and transmitting data under the control of the processor
  • the processor is configured to do the following:
  • each short transmission time interval TTI
  • OFDM orthogonal frequency division multiplexing
  • CRS common pilot
  • a demodulation reference signal (DMRS) is mapped in the selected OFDM symbol and the DMRS is transmitted.
  • the embodiment of the present disclosure further provides a terminal, including:
  • transceiver for receiving and transmitting data under the control of the processor
  • the processor is configured to do the following:
  • each short transmission time interval TTI
  • OFDM orthogonal frequency division multiplexing
  • CRS common pilot
  • a demodulation reference signal (DMRS) transmitted by the base station is obtained in the selected OFDM symbol.
  • DMRS demodulation reference signal
  • Embodiments of the present disclosure also provide a non-transitory computer readable storage medium storing computer readable instructions executable by a processor, the computer readable instructions being executed by a processor
  • the processor performs the following operations:
  • each short transmission time interval TTI
  • OFDM orthogonal frequency division multiplexing
  • CRS common pilot
  • a demodulation reference signal (DMRS) is mapped in the selected OFDM symbol and the DMRS is transmitted.
  • Embodiments of the present disclosure also provide a non-transitory computer readable storage medium storing computer readable instructions executable by a processor, the computer readable instructions being executed by a processor
  • the processor performs the following operations:
  • each short transmission time interval TTI
  • OFDM orthogonal frequency division multiplexing
  • CRS common pilot
  • a demodulation reference signal (DMRS) transmitted by the base station is obtained in the selected OFDM symbol.
  • DMRS demodulation reference signal
  • each short transmission time interval TTI at least one orthogonal frequency division multiplexing OFDM symbol that does not map the common pilot CRS is selected; and the demodulation reference signal is mapped in the selected OFDM symbol.
  • DMRS orthogonal frequency division multiplexing OFDM symbol that does not map the common pilot CRS
  • FIG. 1 is a working flowchart of a resource mapping method for demodulating a reference signal according to an embodiment of the present disclosure
  • FIG. 2 is still another working flowchart of a resource mapping method for demodulating a reference signal according to an embodiment of the present disclosure
  • FIG. 3 is still another working flowchart of a resource mapping method for demodulating a reference signal according to an embodiment of the present disclosure
  • 4a is a first pilot pattern of a TTI of two OFDM symbol lengths supporting up to four layers of transmission in an embodiment of the present disclosure
  • 4b is a second pilot pattern of TTIs of two OFDM symbol lengths supporting up to four layers of transmission in an embodiment of the present disclosure
  • 4c is a third pilot pattern of TTIs of two OFDM symbol lengths supporting up to four layers of transmission in an embodiment of the present disclosure
  • 5a is a fourth pilot pattern of TTIs of two OFDM symbol lengths supporting up to four layers of transmission in an embodiment of the present disclosure
  • 5b is a fifth pilot pattern of TTIs of two OFDM symbol lengths supporting up to four layers of transmissions in an embodiment of the present disclosure
  • 5c is a sixth pilot pattern of TTIs of two OFDM symbol lengths supporting up to four layers of transmissions in an embodiment of the present disclosure
  • 6a is a seventh pilot pattern of TTIs of two OFDM symbol lengths supporting up to four layers of transmission in an embodiment of the present disclosure
  • 6b is an eighth pilot pattern of TTIs of two OFDM symbol lengths supporting up to four layers of transmission in an embodiment of the present disclosure
  • 6c is a ninth pilot pattern of TTIs of two OFDM symbol lengths supporting up to four layers of transmissions in an embodiment of the present disclosure
  • 7a is a tenth pilot pattern of a TTI of two OFDM symbol lengths supporting up to four layers of transmissions in an embodiment of the present disclosure
  • 7b is an eleventh pilot pattern of TTIs of two OFDM symbol lengths supporting up to four layers of transmission in an embodiment of the present disclosure
  • 7c is a twelfth pilot pattern of TTIs of two OFDM symbol lengths supporting up to four layers of transmission in an embodiment of the present disclosure
  • 8a is a TTI of two OFDM symbol lengths supporting up to eight layers of transmission in an embodiment of the present disclosure First pilot pattern
  • 8b is a second pilot pattern of a TTI of two OFDM symbol lengths supporting up to eight layers of transmission in an embodiment of the present disclosure
  • 8c is a third pilot pattern of TTIs of two OFDM symbol lengths supporting up to eight layers of transmission in an embodiment of the present disclosure
  • 9a is a fourth pilot pattern of TTIs of two OFDM symbol lengths supporting up to eight layers of transmission in an embodiment of the present disclosure
  • 9b is a fifth pilot pattern of TTIs of two OFDM symbol lengths supporting up to eight layers of transmission in an embodiment of the present disclosure
  • 9c is a sixth pilot pattern of TTIs of two OFDM symbol lengths supporting up to eight layers of transmissions in an embodiment of the present disclosure
  • 10a is a seventh pilot pattern of TTIs of two OFDM symbol lengths supporting up to eight layers of transmission in an embodiment of the present disclosure
  • 10b is an eighth pilot pattern of TTIs of two OFDM symbol lengths supporting up to eight layers of transmission in an embodiment of the present disclosure
  • 10c is a ninth pilot pattern of TTIs of two OFDM symbol lengths supporting up to eight layers of transmission in an embodiment of the present disclosure
  • 11a is a tenth pilot pattern of a TTI of two OFDM symbol lengths supporting up to eight layers of transmission in an embodiment of the present disclosure
  • 11b is an eleventh pilot pattern of a TTI of two OFDM symbol lengths supporting up to eight layers of transmission in an embodiment of the present disclosure
  • 11c is a twelfth pilot pattern of TTIs of two OFDM symbol lengths supporting up to eight layers of transmission in an embodiment of the present disclosure
  • 12 is a pilot pattern of a TTI of seven OFDM symbol lengths supporting up to four layers of transmission in an embodiment of the present disclosure
  • 13 is a pilot pattern of a TTI of up to seven OFDM symbol lengths supporting eight layers of transmission in an embodiment of the present disclosure.
  • FIG. 14 is a structural block diagram of a base station according to an embodiment of the present disclosure.
  • FIG. 15 is a structural block diagram of a terminal according to an embodiment of the present disclosure.
  • 16 is a block diagram showing another structure of a base station according to an embodiment of the present disclosure.
  • FIG. 17 is still another structural block diagram of a terminal according to an embodiment of the present disclosure.
  • An embodiment of the present disclosure provides a resource mapping method and a base station for demodulating a reference signal, which solves the problem that when the TTI length is shortened, the original pilot mapping manner cannot include DMRS in each TTI, thereby affecting channel estimation performance. The problem.
  • a resource mapping method for demodulating a reference signal includes:
  • Step 101 In each short transmission time interval TTI, select at least one orthogonal frequency division multiplexing OFDM symbol that does not map the common pilot CRS.
  • At least one unmapped CRS OFDM symbol may be selected in each short TTI of a resource block including 14 OFDM symbols, and each OFDM symbol includes 12 subcarriers.
  • the length of the short TTI is the length of time corresponding to the preset number of OFDM symbols, and the preset number is less than 14.
  • the length of the short TTI may be a length of time corresponding to two OFDM symbols or a length of time corresponding to seven OFDM symbols.
  • Step 102 Map the demodulation reference signal DMRS in the selected OFDM symbol.
  • the demodulation reference signal DMRS is mapped in the selected OFDM symbol by using the CDM-F, where the CDM-F refers to spreading in the frequency domain by using Code Division Multiplexing (CDM).
  • CDM-F refers to spreading in the frequency domain by using Code Division Multiplexing (CDM).
  • CDM-F refers to spreading in the frequency domain by using Code Division Multiplexing (CDM).
  • CDM-F Code Division Multiplexing
  • the embodiment of the present disclosure ensures that each TTI includes DMRS, which improves channel estimation performance.
  • the resource mapping method of the demodulation reference signal in the embodiment of the present disclosure includes:
  • Step 201 If the length of the short TTI is the length of time corresponding to the two OFDM symbols, then in each of the short TTIs, one OFDM symbol of the unmapped CRS is selected.
  • one unmapped CRS OFDM symbol may be selected in each short TTI of a resource block including 14 OFDM symbols, and each OFDM symbol includes 12 subcarriers.
  • the TTI is reduced to 2 OFDM symbols
  • the control region of the resource block includes two OFDM symbols, and the CRS is mapped in both OFDM symbols in the control region, the first and last TTIs in the data region are available. Selecting one of the two OFDM symbols, selecting one OFDM symbol of the unmapped CRS in the TTI between the first TTI and the last TTI of the data region (the TTI between the first TTI and the last TTI of the data region)
  • One of the two OFDM symbols has a mapped CRS).
  • each subframe includes 14 OFDM symbols
  • a third OFDM symbol and a thirteenth OFDM are selected in each of the subframes. Symbol; or
  • a third OFDM symbol and a fourteenth OFDM symbol are selected in each of the subframes.
  • a fourth OFDM symbol and a thirteenth OFDM symbol are selected in each of the subframes.
  • a fourth OFDM symbol and a fourteenth OFDM symbol are selected in each of the subframes.
  • a fourteenth OFDM symbol is selected in each of the subframes (here, the case where the third OFDM symbol and the fourth OFDM symbol of each subframe are in the control region, not shown in the figure).
  • Step 202 Map the demodulation reference signal DMRS in the selected OFDM symbol.
  • the number of antenna ports of the DMRS is at most 4, and if one resource block RB or 12 subcarriers are used as a unit in the frequency domain, each of the selected ones Mapping the DMRS in the second subcarrier, the third subcarrier, the eighth subcarrier, and the ninth subcarrier in the OFDM symbol; or
  • the DMRS is mapped in the first subcarrier, the second subcarrier, the ninth subcarrier, and the tenth subcarrier in each selected OFDM symbol.
  • antenna ports R7, R8, R11, and R13 are a group of CDM groups
  • antenna ports R9, R10, R12, and R14 are another group of CDM groups
  • different CDM groups are distinguished by frequency division.
  • the number of antenna ports of the DMRS is at most 8. If one RB or 12 subcarriers are used as a unit in the frequency domain, then each selected OFDM is selected. Mapping the DMRS in the second subcarrier, the third subcarrier, the fourth subcarrier, the fifth subcarrier, the eighth subcarrier, the ninth subcarrier, the tenth subcarrier, and the eleventh subcarrier in the symbol; or
  • the first subcarrier, the second subcarrier, the third subcarrier, the fourth subcarrier, the ninth subcarrier, and the tenth in each selected OFDM symbol The DMRS is mapped in the subcarriers, the 11th subcarrier, and the 12th subcarrier.
  • a resource mapping method for demodulating reference signals for each short transmission time interval TTI, for each short transmission time interval TTI, an orthogonal frequency division multiplexing OFDM with unmapped common pilot CRS is selected. Symbol; mapping the demodulation reference signal DMRS in the selected OFDM symbol.
  • the embodiment of the present disclosure ensures that each TTI includes DMRS, which improves channel estimation performance.
  • the resource mapping method of the demodulation reference signal in the embodiment of the present disclosure includes:
  • Step 301 If the length of the short TTI is the length of time corresponding to the seven OFDM symbols, select at least one orthogonal frequency division multiplexing with unmapped common pilot CRS according to the maximum number of antenna ports of the DMRS. OFDM symbol.
  • At least one unmapped CRS OFDM symbol may be selected in each short TTI of a resource block including 14 OFDM symbols, and each OFDM symbol includes 12 subcarriers.
  • the pilot resource mapping can also be performed using the CDM-F method.
  • two or four columns of pilots can be inserted, all belonging to the same CDM group.
  • the position of the pilot in the frequency domain is distributed on 4 REs, wherein the two REs are divided into two groups, and the two groups of REs are separated by a certain distance; The column pilots are also separated by a certain distance.
  • Figures 12 and 13 are two pilot patterns that support up to 4 layers of transmission and up to 8 layers of transmission, respectively.
  • Figure 12 shows the pilot pattern of the antenna ports R7-R10 based on the maximum supported 4-layer transmission.
  • At least one or at least two OFDM symbols may be selected according to the maximum number of antenna ports of the DMRS.
  • the number of antenna ports of the DMRS is at most 4, at least one OFDM symbol that does not map the common pilot CRS is selected in each short TTI. Further, as shown in FIG. 12, in each short TTI, a third OFDM symbol and a sixth OFDM symbol are selected; or
  • the 4th OFDM symbol and the 6th OFDM symbol are selected.
  • the 3rd OFDM symbol and the 7th OFDM symbol are selected.
  • the 4th OFDM symbol and the 7th OFDM symbol are selected.
  • the 6th OFDM symbol is selected (here, the case where the third OFDM symbol and the fourth OFDM symbol of each subframe are in the control region are not shown in the figure); or
  • the 7th OFDM symbol is selected (here, the case where the third OFDM symbol and the fourth OFDM symbol of each subframe are in the control region, not shown in the figure).
  • each short TTI at least two OFDM symbols not mapped to the common pilot CRS are selected. Further, as shown in FIG. 13, in each short TTI, a third OFDM symbol, a fourth OFDM symbol, a sixth OFDM symbol, and a seventh OFDM symbol are selected; or
  • the 6th OFDM symbol and the 7th OFDM symbol are selected (here, the case where the third OFDM symbol and the fourth OFDM symbol of each subframe are in the control region are not shown in the figure).
  • Step 302 Map the demodulation reference signal DMRS in the selected OFDM symbol.
  • each of the selected subcarriers occupies the same frequency domain position in different OFDM symbols.
  • the second subcarrier, the third word carrier, the eighth word subcarrier, and the ninth subcarrier mapping demodulation reference signal DMRS are selected in each selected OFDM symbol.
  • a resource mapping method for demodulating reference signals for each short transmission time interval TTI, selecting a plurality of orthogonal frequency division multiplexing of unmapped common pilot CRSs for a short TTI of 7 OFDM symbol lengths OFDM symbol; the demodulation reference signal DMRS is mapped in the selected OFDM symbol.
  • the embodiment of the present disclosure ensures that each TTI includes DMRS, which improves channel estimation performance.
  • an embodiment of the present disclosure further provides a base station, including:
  • the first selecting module 141 is configured to select, in each short transmission time interval TTI, at least one orthogonal frequency division multiplexing OFDM symbol that does not map the common pilot CRS;
  • the mapping module 142 is configured to map the demodulation reference signal DMRS in the selected OFDM symbol, And sending the DMRS.
  • the first selection module 141 includes:
  • the first selection sub-module 1411 is configured to select, in each of the short TTIs, an OFDM symbol that is not mapped to the CRS, if the length of the short TTI is a length of time corresponding to two OFDM symbols.
  • the first selecting sub-module 1411 is configured to: when each subframe includes 14 OFDM symbols, select a third OFDM symbol and a thirteenth OFDM symbol in each of the subframes; or
  • a fourteenth OFDM symbol is selected in each of the subframes.
  • the mapping module 142 includes:
  • the first mapping sub-module 1421, the number of antenna ports for the DMRS is up to 4, and one resource block RB or 12 sub-carriers are one unit in the frequency domain, and then the first in each selected OFDM symbol Mapping DMRS in 2 subcarriers, 3rd subcarrier, 8th subcarrier, and 9th subcarrier; or
  • the DMRS is mapped in the first subcarrier, the second subcarrier, the ninth subcarrier, and the tenth subcarrier in each selected OFDM symbol.
  • the mapping module 142 includes:
  • a second mapping sub-module 1422 where the number of antenna ports for the DMRS is at most 8 and one RB or 12 sub-carriers are used as a unit in the frequency domain, and then the second sub-input of each selected OFDM symbol Carrier, 3rd subcarrier, 4th subcarrier, 5th subcarrier, 8th Mapping DMRS in subcarrier, ninth subcarrier, tenth subcarrier, and eleventh subcarrier; or
  • the first subcarrier In the first subcarrier, the second subcarrier, the fourth subcarrier, the fifth subcarrier, the seventh subcarrier, the eighth subcarrier, the eleventh subcarrier, and the twelfth subcarrier in each selected OFDM symbol Map DMRS; or
  • the second subcarrier In the first subcarrier, the second subcarrier, the third subcarrier, the fourth subcarrier, the ninth subcarrier, the tenth subcarrier, the eleventh subcarrier, and the twelfth subcarrier in each selected OFDM symbol Map DMRS.
  • the first selection module 141 includes:
  • a second selection sub-module 1412 configured to select at least one unmapped common pilot CRS according to a maximum value of the number of antenna ports of the DMRS, if the length of the short TTI is a length of time corresponding to seven OFDM symbols Orthogonal Frequency Division Multiplexing (OFDM) symbols.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the second selection sub-module 1412 includes:
  • the first selecting unit 14121 is configured to: if each of the short TTIs selects at least one OFDM symbol that does not map the common pilot CRS, if the number of antenna ports of the DMRS is at most 4.
  • the first selecting unit is configured to select a third OFDM symbol and a sixth OFDM symbol in each short TTI;
  • the 4th OFDM symbol and the 6th OFDM symbol are selected.
  • the 3rd OFDM symbol and the 7th OFDM symbol are selected.
  • the 4th OFDM symbol and the 7th OFDM symbol are selected.
  • the sixth OFDM symbol is selected.
  • the 7th OFDM symbol is selected.
  • the second selection sub-module 1412 includes:
  • the second selecting unit 14122 is configured to select at least two OFDM symbols that do not map the common pilot CRS in each short TTI if the number of antenna ports of the DMRS is at most 8.
  • the second selecting unit is configured to select, in each short TTI, a third OFDM symbol, a fourth OFDM symbol, a sixth OFDM symbol, and a seventh OFDM symbol; or
  • the 6th OFDM symbol and the 7th OFDM symbol are selected.
  • the mapping module 142 includes:
  • the third mapping sub-module 1423 is configured to: if there are 1 RB or 12 sub-carriers as a unit in the frequency domain, select two adjacent two sub-carrier mapping demodulation reference signals DMRS in each selected OFDM symbol. Wherein each of the selected subcarriers occupies the same frequency domain position in different OFDM symbols.
  • the third mapping sub-module 1423 is configured to select a second subcarrier, a third word carrier, an eighth subcarrier, and a ninth subcarrier mapping demodulation in each selected OFDM symbol.
  • Reference signal DMRS is configured to select a second subcarrier, a third word carrier, an eighth subcarrier, and a ninth subcarrier mapping demodulation in each selected OFDM symbol.
  • the base station is a base station corresponding to the foregoing method embodiment. All the implementation manners in the foregoing method embodiments are applicable to the embodiment of the base station, and the same technical effects can be achieved.
  • the base station selects at least one orthogonal frequency division multiplexing OFDM symbol that does not map the common pilot CRS in each short transmission time interval TTI; and maps the demodulation reference signal DMRS in the selected OFDM symbol.
  • the embodiment of the present disclosure can ensure that each TTI includes DMRS, thereby greatly improving channel estimation performance.
  • An embodiment of the present disclosure further provides a terminal, as shown in FIG. 15, including:
  • the second selecting module 151 is configured to select, in each short transmission time interval TTI, at least one orthogonal frequency division multiplexing OFDM symbol that does not map the common pilot CRS;
  • the obtaining module 152 is configured to obtain, in the selected OFDM symbol, a demodulation reference signal DMRS sent by the base station.
  • the second selection module 151 includes:
  • the third selection sub-module 1511 is configured to select, in each of the short TTIs, an OFDM symbol that is not mapped to the CRS, if the length of the short TTI is a length of time corresponding to two OFDM symbols.
  • the third selecting sub-module 1511 is configured to: when each subframe includes 14 OFDM symbols, select a third OFDM symbol and a thirteenth OFDM symbol in each of the subframes; or
  • a fourteenth OFDM symbol is selected in each of the subframes.
  • the obtaining module 152 includes:
  • a first obtaining sub-module 1521 where the number of antenna ports used in the DMRS is at most 4 and 1 resource block RB or 12 sub-carriers in a frequency domain is a unit, and then in each selected OFDM symbol Acquiring the DMRS sent by the base station in the 2 subcarriers, the 3rd subcarrier, the 8th subcarrier, and the ninth subcarrier; or
  • the DMRS sent by the base station is obtained in the first subcarrier, the second subcarrier, the ninth subcarrier, and the tenth subcarrier in each selected OFDM symbol.
  • the obtaining module 152 includes:
  • a second obtaining sub-module 1522 wherein the number of antenna ports for the DMRS is at most 8 and one RB or 12 subcarriers are used as a unit in the frequency domain, and then the second sub-input of each selected OFDM symbol Acquiring the DMRS sent by the base station in the carrier, the third subcarrier, the fourth subcarrier, the fifth subcarrier, the eighth subcarrier, the ninth subcarrier, the tenth subcarrier, and the eleventh subcarrier; or
  • the DMRS sent by the base station Obtaining the DMRS sent by the base station;
  • the DMRS sent by the base station.
  • the second selection module 151 includes:
  • the fourth selection sub-module 1512 is configured to select at least one of the maximum length of the number of antenna ports of the DMRS if the length of the short TTI is the length of time corresponding to the seven OFDM symbols. Orthogonal Frequency Division Multiplexing OFDM symbols that do not map the common pilot CRS.
  • the fourth selection sub-module 1512 includes:
  • the third selecting unit 15121 is configured to: if each of the short TTIs selects at least one OFDM symbol that does not map the common pilot CRS, if the number of antenna ports of the DMRS is at most 4.
  • the third selecting unit 15121 is configured to select a third OFDM symbol and a sixth OFDM symbol in each short TTI;
  • the 4th OFDM symbol and the 6th OFDM symbol are selected.
  • the 3rd OFDM symbol and the 7th OFDM symbol are selected.
  • the 4th OFDM symbol and the 7th OFDM symbol are selected.
  • the sixth OFDM symbol is selected.
  • the 7th OFDM symbol is selected.
  • the fourth selection sub-module 1512 includes:
  • the fourth selecting unit 15122 is configured to: if each of the short TTIs selects at least two OFDM symbols that do not map the common pilot CRS, if the number of antenna ports of the DMRS is at most 8.
  • the fourth selecting unit is configured to select, in each short TTI, a third OFDM symbol, a fourth OFDM symbol, a sixth OFDM symbol, and a seventh OFDM symbol; or
  • the 6th OFDM symbol and the 7th OFDM symbol are selected.
  • the obtaining module 152 includes:
  • the third obtaining sub-module 1523 is configured to: if one RB or 12 sub-carriers are used as one unit in the frequency domain, select two adjacent four sub-carriers in each selected OFDM symbol to obtain demodulation sent by the base station.
  • the reference signal DMRS wherein each of the selected subcarriers occupies the same frequency domain position in different OFDM symbols.
  • the third obtaining sub-module 1523 is configured to select a second subcarrier, a third word carrier, an eighth subcarrier, and a ninth subcarrier to obtain a base station to send in each selected OFDM symbol.
  • Demodulation reference signal DMRS Demodulation reference signal
  • the terminal is a terminal corresponding to the foregoing method embodiment. All the implementation manners in the foregoing method embodiments are applicable to the embodiment of the terminal, and the same technical effects can be achieved.
  • the terminal of the embodiment of the present disclosure selects at least one not in each short transmission time interval TTI. And mapping orthogonal OFDM OFDM symbols of the common pilot CRS; acquiring a demodulation reference signal DMRS sent by the base station in the selected OFDM symbol.
  • the embodiment of the present disclosure can ensure that each TTI includes DMRS, thereby greatly improving channel estimation performance.
  • an embodiment of the present disclosure further provides a base station, where the base station includes: a processor 1600; a memory 1620 connected to the processor 1600 through a bus interface, and a transceiver 1610 coupled to the processor 1600 via a bus interface; the memory 1620 for storing programs and data used by the processor in performing operations; transmitting data information or pilots through the transceiver 1610, The uplink control channel is received by the transceiver 1610; when the processor 1600 calls and executes the program and data stored in the memory 1620, the following functional modules are implemented:
  • a first selecting module configured to: in each short transmission time interval TTI, select at least one orthogonal frequency division multiplexing OFDM symbol that does not map the common pilot CRS;
  • mapping module configured to map the demodulation reference signal DMRS in the selected OFDM symbol, and send the DMRS.
  • the processor 1600 is configured to read the program in the memory 1620, and perform the following process: in each short transmission time interval TTI, select at least one orthogonal frequency division multiplexing OFDM symbol that does not map the common pilot CRS, in the selected
  • the demodulation reference signal DMRS is mapped in the OFDM symbol and transmitted by the transceiver 1610.
  • the transceiver 1610 is configured to receive and transmit data under the control of the processor 1600.
  • the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 1600 and various circuits of memory represented by memory 1620.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • the bus interface provides an interface.
  • the transceiver 1610 can be a plurality of components, including a transmitter and a transceiver, providing means for communicating with various other devices on a transmission medium.
  • the processor 1600 is responsible for managing the bus architecture and general processing, and the memory 1620 can store data used by the processor 1600 in performing operations.
  • the processor 1600 is configured to use, in each short transmission time interval TTI, And selecting at least one orthogonal frequency division multiplexing OFDM symbol that does not map the common pilot CRS; mapping the demodulation reference signal DMRS in the selected OFDM symbol.
  • the embodiment of the present disclosure can ensure that each TTI includes DMRS, thereby greatly improving channel estimation performance.
  • an embodiment of the present disclosure further provides a terminal, where the terminal includes: a processor 1700; a memory 1720 connected to the processor 1700 through a bus interface, and a transceiver 1710 coupled to the processor 1700; the memory for storing programs and data used by the processor in performing operations; receiving, by the transceiver 1710, a downlink control channel; when the processor 1700 is invoked
  • the terminal includes: a processor 1700; a memory 1720 connected to the processor 1700 through a bus interface, and a transceiver 1710 coupled to the processor 1700; the memory for storing programs and data used by the processor in performing operations; receiving, by the transceiver 1710, a downlink control channel; when the processor 1700 is invoked
  • the program and data stored in the memory 1720 are executed, the following functional modules are implemented:
  • a second selecting module configured to: in each short transmission time interval TTI, select at least one orthogonal frequency division multiplexing OFDM symbol that does not map the common pilot CRS;
  • an obtaining module configured to obtain, in the selected OFDM symbol, a demodulation reference signal DMRS sent by the base station.
  • the processor 1700 is configured to read a program in the memory 1720, and perform the following process: in each short transmission time interval TTI, select at least one orthogonal frequency division multiplexing OFDM symbol that does not map the common pilot CRS, and pass the transceiver. 1710: Obtain a demodulation reference signal DMRS sent by the base station in the selected OFDM symbol.
  • the transceiver 1710 is configured to receive and transmit data under the control of the processor 1700.
  • the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 1700 and various circuits of memory represented by memory 1520.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • the bus interface provides an interface.
  • Transceiver 1710 can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium.
  • the user interface 1730 may also be an interface capable of externally connecting the required devices, including but not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.
  • the processor 1700 is responsible for managing the bus architecture and general processing, and the memory 1720 can store data used by the processor 1700 in performing operations.
  • the processor 1700 is configured to: in each short transmission time interval TTI, select at least one orthogonal frequency division multiplexing OFDM symbol that does not map the common pilot CRS; acquire the base station in the selected OFDM symbol.
  • the demodulation reference signal DMRS is transmitted.
  • the embodiment of the present disclosure can ensure that each TTI includes DMRS, thereby greatly improving channel estimation performance.

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

Abstract

L'invention concerne un procédé de mise en correspondance de ressources utilisé dans une démodulation de signal de référence, une station de base, un terminal et un support de mémorisation de données. Le procédé de mise en correspondance de ressources comprend : la sélection, dans chaque intervalle de temps de transmission (TTI) court, d'au moins un symbole de multiplexage par répartition orthogonale de la fréquence (OFDM) ne contenant pas de signal de référence commun (CRS) mis en correspondance; et la mise en correspondance, dans le symbole OFDM sélectionné, d'un signal de référence de démodulation (DMRS).
PCT/CN2017/093412 2016-08-10 2017-07-18 Procédé de mise en correspondance de ressources utilisé dans une démodulation de signal de référence, station de base, terminal et support de mémorisation de données Ceased WO2018028397A1 (fr)

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WO2023123097A1 (fr) * 2021-12-29 2023-07-06 北京小米移动软件有限公司 Procédé et dispositif de détermination de faisceau de groupes d'éléments de ressources, et procédé et dispositif de mappage de faisceaux de groupes d'éléments de ressources
WO2025086281A1 (fr) * 2023-10-27 2025-05-01 华为技术有限公司 Procédé et appareil de communication

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