WO2014015800A1 - Procédé et dispositif de transmission de signal de référence de démodulation spécifique d'équipement utilisateur en liaison descendante - Google Patents

Procédé et dispositif de transmission de signal de référence de démodulation spécifique d'équipement utilisateur en liaison descendante Download PDF

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Publication number
WO2014015800A1
WO2014015800A1 PCT/CN2013/079948 CN2013079948W WO2014015800A1 WO 2014015800 A1 WO2014015800 A1 WO 2014015800A1 CN 2013079948 W CN2013079948 W CN 2013079948W WO 2014015800 A1 WO2014015800 A1 WO 2014015800A1
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Prior art keywords
antenna port
mapping
res
current subframe
transmitted
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PCT/CN2013/079948
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English (en)
Chinese (zh)
Inventor
高雪娟
林亚男
丁昱
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电信科学技术研究院
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Priority claimed from CN201310055541.XA external-priority patent/CN103581094B/zh
Application filed by 电信科学技术研究院 filed Critical 电信科学技术研究院
Publication of WO2014015800A1 publication Critical patent/WO2014015800A1/fr

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Classifications

    • 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
    • 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), 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space

Definitions

  • the present application relates to the field of wireless communications, and in particular, to a method and a device for transmitting a downlink user-dedicated demodulation reference signal.
  • OFDM Orthogonal Frequency Division Multiplexing
  • LTE-A Long Term Evolution-Advance
  • a legacy downlink channel carrying downlink control information such as a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator Channel (PCFICH), and a Physical Hybrid-ARQ Indicator Channel (Physical Hybrid-ARQ Indicator Channel, PHICH), transmitting in the control region;
  • the downlink channel carrying the downlink data such as the Physical Downlink Shared Channel (PDSCH)
  • PDSCH Physical Downlink Shared Channel
  • the downlink reference signals for demodulation in the LTE-A system mainly include Cell-specific reference signals (CRS) and User Equipment (UE, also called terminal equipment) dedicated demodulation reference signals (DeModulation Reference Signal). , DM-RS).
  • CRS Cell-specific reference signals
  • UE User Equipment
  • DM-RS Downlink Reference Signal
  • a physical resource block (PRB) corresponding to each time slot (slot) in a sub-frame is called a PRB pair, and a CRS resource mapping manner in units of one PRB pair is used.
  • PRB physical resource block
  • FIG. 2b is the mapping mode under the extended CP.
  • the CRS is transmitted over the full bandwidth of the carrier and is transmitted in every subframe.
  • DM-RS is only transmitted on the PRB where the PDSCH transmission with transmission mode is ⁇ 9, to reduce the reference symbol overhead, save energy, and reduce the interval between adjacent cells.
  • Figure 3a (under the regular CP) and Figure 3b (under the extended CP) show the resource mapping of the DM-RS in a PRB pair, where the DM-RS is at the antenna port 7/8/11/13 The mapping resources on the same are the same, and the mapping resources on the antenna port 9/10/12/14 are the same.
  • DwPTS Downlink Pilot Time Slots in Time Division Duplex (TDD) systems
  • DwPTS Downlink Pilot Time Slots in Time Division Duplex (TDD) systems
  • TDD Time Division Duplex
  • the DwPTS is a special subframe of 768Q ⁇ , which is the system use time interval, that is, the special subframe using the downlink normal CP under the special subframe configuration 0 and 5, and the special subframe configuration 0 and 4
  • the special subframe of the downlink extended CP does not support DM-RS transmission.
  • Table 1 DM-RS orthogonal sequences for different antenna ports under conventional CP
  • LTE-A system version-11 (Rel-11, Release 11) is determined for carrier aggregation (Carrier Aggregation, CA).
  • the new carrier type (NCT) is introduced into the system.
  • NCT carrier aggregation
  • the legacy downlink channel carrying the downlink control information such as the PDCCH is not transmitted.
  • the PDSCH can be transmitted on the first N OFDM symbols (that is, the control region in one subframe defined on the legacy carrier).
  • the PDSCH can be transmitted on all OFDM symbols in one subframe; the NCT only supports PDSCH transmission using transmission mode 9, and can be cross-carrier scheduling by the PDCCH on the legacy carrier aggregated with the NCT, or can be enhanced by the NCT.
  • EC-PDCCH physical downlink control channel
  • the DM-RS is not transmitted on the OFDM symbol of the control region, and the E-PDCCH and the PDSCH on the NCT are mapped in the time domain to all OFDM symbols in one subframe.
  • the channel estimation information on the first N OFDM symbols needs to be obtained by extrapolating the DM-RS of the finite column, which reduces the data demodulation performance on the NCT; and the DM-RS does not support 3 DwPTSs.
  • the special subframe of the OFDM symbol is transmitted, so that the downlink data is not transmitted based on the DM-RS in the special subframe including only three OFDM symbols, which reduces the resource utilization of the NCT.
  • SUMMARY Embodiments of the present application provide a downlink user-specific demodulation reference signal transmission method and device, which are used to improve data demodulation performance on an NCT carrier.
  • a downlink user-specific demodulation reference signal DM-RS transmission method comprising:
  • the DM-RS resource mapping manner determines the mapping resource of the DM-RS in the current subframe, and the DM-RS mapping resource includes at least one of the first N orthogonal frequency division multiplexing OFDM symbols of the current subframe.
  • the resource unit RE on the OFDM symbol, N is an integer not less than one;
  • the terminal acquires the DM-RS transmitted in the current subframe according to the determined DM-RS mapping resource.
  • a downlink user-specific demodulation reference signal DM-RS transmission method comprising:
  • the base station determines, according to the DM-RS resource mapping manner, the mapping resource of the DM-RS in the current subframe, where the DM-RS mapping resource includes at least one of the first N orthogonal frequency division multiplexing OFDM symbols of the current subframe.
  • the resource unit RE on the symbol, N is an integer not less than one;
  • the base station maps the DM-RS into the current subframe for transmission according to the determined DM-RS mapping resource.
  • a terminal the terminal comprising:
  • a resource mapping unit configured to determine, according to a DM-RS resource mapping manner, a mapping resource of the DM-RS in the current subframe, where
  • the DM-RS mapping resource includes at least a resource unit RE on at least one of the first N orthogonal frequency division multiplexing OFDM symbols of the current subframe, where N is an integer not less than one;
  • a signal acquiring unit configured to acquire, according to the determined DM-RS mapping resource, a base station that is transmitted in a current subframe, where the base station includes:
  • a resource mapping unit configured to determine a mapping resource of the DM-RS in the current subframe according to the DM-RS resource mapping manner, where the DM-RS mapping resource includes at least the first N orthogonal frequency division multiplexing OFDM symbols of the current subframe
  • the resource unit RE at least one of the OFDM symbols, N is an integer not less than one;
  • a data transmission unit configured to map the DM-RS into the current subframe according to the determined DM-RS mapping resource for transmission.
  • the mapping resource of the ⁇ -RS exists in the control region of the subframe (that is, the first N OF ⁇ symbols), so that the channel estimation information on the first N OF ⁇ symbols can pass the N
  • the ⁇ -RS transmitted on the OF symbol is calculated by interpolation, and the ⁇ -RS of the finite column far away from the N symbols in the time domain is prevented from being extrapolated, thereby improving the data demodulation performance of the NCT. It is also ensured that the w-RS transmission exists in the special subframe in which the DwPTS only contains three OF s symbols, so that the downlink data can be transmitted in these special subframes, thereby improving the transmission efficiency and spectrum utilization of the NCT.
  • FIG. 1 is a schematic diagram showing a multiplexing relationship between a control region and a data region in a downlink subframe in the prior art
  • FIG. 2a is a schematic diagram of a CRS resource mapping manner in a conventional CP in the prior art
  • 2b is a schematic diagram of a CRS resource mapping manner in an extended CP in the prior art
  • FIG. 3a is a schematic diagram of a DM-RS resource mapping manner in a conventional CP in the prior art
  • FIG. 3b is a schematic diagram of a DM-RS resource mapping manner in an extended CP in the prior art
  • FIG. 5 is a schematic flowchart of another method provided by an embodiment of the present application.
  • 6a to 6j are schematic diagrams of DM-RS resource mapping according to Embodiment 1 of the present application.
  • FIGS. 7a to 7i are schematic diagrams of DM-RS resource mapping according to Embodiment 2 of the present application.
  • 8a to 8c are schematic diagrams of DM-RS resource mapping according to Embodiment 3 of the present application.
  • 9a to 9c are schematic diagrams of DM-RS resource mapping according to Embodiment 4 of the present application.
  • 10a to 10i are schematic diagrams of DM-RS resource mapping according to Embodiment 5 of the present application.
  • FIG. 15 are schematic diagrams of DM-RS resource mapping according to Embodiment 6 of the present application.
  • FIG. 12a to 12d are schematic diagrams of DM-RS resource mapping according to Embodiment 7 of the present application;
  • FIG. 13 is a schematic structural diagram of a device according to an embodiment of the present disclosure.
  • FIG. 14 is a schematic structural diagram of another device according to an embodiment of the present application.
  • the embodiment of the present application provides a DM-RS transmission method applicable to an NCT carrier.
  • a mapping resource of a DM-RS exists in a control region of a subframe (ie, the first N OFDM symbols), so that the former Channel estimation information on N OFDM symbols can be interpolated by DM-RS transmitted on the N OFDM symbols to avoid extrapolation through DL-RSs of finite columns that are farther away from the N symbols in the time domain.
  • the algorithm is obtained, thereby improving the data demodulation performance of the NCT, and ensuring that the DwPTS also has DM-RS transmission in a special subframe including only three OFDM symbols, so that downlink data can be transmitted in these special subframes, thereby improving the NCT. Transmission efficiency and spectrum utilization.
  • the DM-RS transmission method for the terminal side includes the following steps: Step 40: The terminal determines the mapping resource of the DM-RS in the current subframe by using the DM-RS resource mapping manner.
  • the DM-RS mapping resource includes at least a resource unit (RE) on at least one of the first N OFDM symbols of the current subframe, and N is an integer not less than one;
  • Step 41 The terminal acquires the DM-RS transmitted in the current subframe according to the determined mapping resource of the DM-RS in the current subframe, that is, obtains the DM-RS received on the determined mapping resource.
  • the DM-RS resource mapping mode determines the mapping resource of the DM-RS in the current subframe, and the specific implementation may use one of the following four methods:
  • Method 1 The terminal is based on the pre-agreed rules and the DM-RS resource mapping manner defined in the LTE system version 10, and is translated on the time domain and/or the frequency domain, on the antenna port where the DM-RS transmission is located in the current subframe. And moving part of the REs in the RE set corresponding to the DM-RS on the DM-RS antenna port defined in the LTE system version 10 to at least one OFDM symbol in the first N OFDM symbols of the subframe, after moving RE and the remaining RE that are not moved, as the mapping resource of the DM-RS on the antenna port in the current subframe;
  • the existing DM- is passed on the basis of not changing the DM-RS resource overhead (neither increasing the DM-RS mapping resource).
  • Positional movement of the RS mapping resource such as time domain and/or frequency domain translation, moving part of the DM-RS mapping resource in one subframe determined by the DM-RS resource mapping manner into the first N OFDM symbols of the subframe.
  • the DM-RS mapping resource or the above process itself can be regarded as the DM-RS resource mapping method defined by the UE based on Re-10, and the DM-RS mapping resource is directly obtained through a predetermined translation operation; wherein the DM-RS mapping is performed.
  • the resource is specifically represented by the RE corresponding to the DM-RS;
  • the DM-RS mapping resource on the partial OFDM in the OFDM including the DM-RS mapping resource in one subframe determined by the Rel-10 DM-RS resource mapping manner is moved to the time domain and/or translation to On the 1 or 2 OFDM symbols of the first N OFDM symbols in the subframe, where the DM-RS mapping resources on different OFDM symbols move to different OFDM symbols in the first N OFDM symbols.
  • Method 2 The terminal is based on a pre-agreed rule and a DM-RS resource mapping manner defined in Release 10 of the LTE system, and at least one OFDM symbol in the first N OFDM symbols on the antenna port where the DM-RS transmission is located in the current subframe. Adding an RE used for transmitting the DM-RS, and adding the RE and the RE corresponding to the DM-RS on the DM-RS antenna port defined in the LTE system version 10 as the DM-RS in the current subframe.
  • mapping resource or the RE to be added, and the RE corresponding to the DM-RS on the DM-RS antenna port defined in the LTE system version 10, the RE corresponding to the translated DM-RS in the time domain and/or the frequency domain
  • mapping resource of the DM-RS on the antenna port in the current subframe
  • the DM-RS mapping resource is added to at least one of the first N OFDM symbols of one subframe;
  • the process is regarded as a process in which the UE obtains the DM-RS resource mapping mode that is currently required to be used, and determines the DM-RS mapping resource according to the RE location corresponding to the DM-RS in the DM-RS resource mapping mode;
  • the process itself is regarded as a DM-RS resource mapping method defined by the UE based on Re-10, and the DM-RS mapping resource is directly obtained by adding DM-RS resource operations;
  • one of the N OFDMs before one subframe Or add DM-RS mapping resources on 2 adjacent OFDM symbols.
  • Method 3 The terminal determines a DM-RS resource mapping manner according to the configuration information carried by the high layer signaling or the physical downlink control channel (PDCCH), and determines the DM-RS according to the determined DM-RS resource mapping manner. a mapping resource on the antenna port where the subframe is transmitted, where the configuration information indicates a DM-RS resource mapping manner, or indicates whether a DM-RS mapping resource exists in the first N OFDM symbols of one subframe;
  • PDCCH physical downlink control channel
  • the terminal receives the configuration information through the high-layer signaling or the PDCCH, and determines the DM-RS resource mapping mode that is actually used according to the specific indication of the configuration information.
  • the configuration information may indicate a specific DM-RS resource mapping manner.
  • the DM-RS resource mapping mode is predefined in the system, and the UE determines one of multiple DM-RS resource mapping manners defined in the system indicated by the configuration information; or the configuration information may also indicate Whether the DM-RS mapping resource exists in the first N OFDM symbols, and the UE may select one of the multiple DM-RS resource mapping manners predefined in the system according to the configuration information, or when the configuration information indicates the presence
  • the UE forms a currently used DM-RS based on a predetermined mobility mode (such as the foregoing method 1) or a method of adding a DM-RS resource (such as the foregoing method 2) on the basis of the DM-RS resource mapping manner defined by Rel-10.
  • the resource mapping mode, and determining the DM-RS mapping resource according to the RE location corresponding to the DM-RS in the DM-RS resource mapping manner, or The DM-RS mapping resource is directly determined on the basis of the DM-RS resource mapping manner defined by Rel-10.
  • the UE determines to use the DM-RS resource mapping manner defined by Rel-10.
  • Method 4 The terminal determines, according to the pre-defined DM-RS resource mapping manner, the mapping resource on the antenna port where the DM-RS is transmitted in the current subframe, where the predefined DM-RS resource mapping manner satisfies at least: A DM-RS mapping resource exists on at least one of the first N OFDM symbols of the subframe.
  • the terminal does not need to further form the required DM-RS resource mapping manner, and can directly use the DM-RS resource mapping manner that has been defined in the system and meets the above conditions, according to the DM-RS corresponding RE in the DM-RS resource mapping manner.
  • Location determine the DM-RS mapping resource.
  • the terminal determines the DM-RS resource mapping manner according to the configuration information carried by the high-layer signaling or the PDCCH, and determines the mapping resource of the DM-RS in the current subframe according to the determined DM-RS resource mapping manner.
  • the specific implementation can be one of the following four options:
  • Solution 1 The terminal determines whether DM-RS mapping resources exist in the first N OFDM symbols of the current subframe according to the high-level signaling or the configuration information carried in the PDCCH. When it is determined to exist, the terminal is based on the pre-agreed rule and the LTE system version 10
  • the DM-RS resource mapping manner defined in the DM-RS antenna defined in the LTE system version 10 is performed on the antenna port where the DM-RS transmission is located in the current subframe by the translation in the time domain and/or the frequency domain.
  • a part of the REs in the RE set corresponding to the DM-RS on the port moves to at least one of the first N OFDM symbols of the subframe, and the moved RE and the remaining RE that are not moved are used as the DM-RS.
  • a mapping resource on the antenna port in the current subframe
  • Solution 2 The terminal determines, according to the configuration information carried in the high layer signaling or the PDCCH, whether the DM-RS mapping resource exists in the first N OFDM symbols of the current subframe, and when it is determined to exist, based on the pre-agreed rule and the LTE system version 10
  • the DM-RS resource mapping manner defined in the method the RE used in transmitting the DM-RS is added to at least one of the first N OFDM symbols on the antenna port where the DM-RS transmission is located in the current subframe, and the added RE and the RE corresponding to the DM-RS on the DM-RS antenna port defined in the LTE system version 10, as the mapping resource of the DM-RS on the antenna port in the current subframe, or the added RE and the LTE system version
  • the RE corresponding to the DM-RS on the DM-RS antenna port defined in 10 passes the RE corresponding to the translated DM-RS in the time domain and/or the frequency domain, and acts as the DM-RS on the antenna port in the current subframe
  • Solution 3 The terminal selects a pre-defined DM-RS resource mapping manner indicated by the configuration information from a plurality of predefined DM-RS resource mapping manners according to the configuration information carried in the high-layer signaling or the PDCCH. Determining, according to the selected DM-RS resource mapping manner, a mapping resource on an antenna port where the DM-RS is transmitted in the current subframe;
  • Solution 4 The terminal determines, according to the configuration information carried in the high layer signaling or the PDCCH, whether the DM-RS mapping resource exists in the first N OFDM symbols of the current subframe, and when it is determined to exist, the predefined multiple DM-RS resources are used. Selecting a pre-defined DM-RS mapping resource in the first N OFDM symbols of one subframe in the mapping mode The DM-RS resource mapping mode, and determining the mapping resource on the antenna port where the DM-RS is transmitted in the current subframe according to the selected predefined DM-RS resource mapping manner.
  • the predefined DM-RS when the terminal resides in a pre-defined DM-RS resource mapping manner, and determines a mapping resource of the DM-RS in the current subframe, the predefined DM-RS
  • the resource mapping mode is specifically one of the following three ways:
  • Manner 1 Move part of the REs in the RE set corresponding to the DM-RS on each DM-RS antenna port defined in the LTE system version 10 in one subframe to one through a translation in the time domain and/or the frequency domain. a DM-RS resource mapping manner obtained on at least one of the first N OFDM symbols on the antenna port in the subframe;
  • Manner 2 The DM-RS resource mapping manner corresponding to each DM-RS antenna port defined in the LTE system version 10 is increased in at least one OFDM symbol of the first N OFDM symbols on the antenna port in one subframe.
  • the RE corresponding to the RS as a DM-RS resource mapping manner obtained by the DM-RS in the mapping resource on the antenna port in the current subframe;
  • each group of DM-RS mapping resources is composed of REs corresponding to at least 2 adjacent subcarrier numbers.
  • the terminal DM-based mapping resource in the step 41 obtains the DM-RS transmitted in the current subframe, and the corresponding definition of Rel-10 can be reused.
  • the DM-RS corresponding to the DM-RS antenna port de-spreads the DM-RS to ensure orthogonality between antenna ports using the same resource mapping mode.
  • the four REs corresponding to the same subcarrier number or the adjacent subcarrier number in the RE used by the DM-RS are transmitted as a group.
  • the DM-RS transmitted on each group of REs is despread by using a time domain orthogonal spreading sequence of length 4 corresponding to the current DM-RS antenna port defined by the LTE system version 10 to obtain the transmission on the current antenna port.
  • DM-RS a time domain orthogonal spreading sequence of length 4 corresponding to the current DM-RS antenna port defined by the LTE system version 10 to obtain the transmission on the current antenna port.
  • step 41 the terminal is located in the determined DM-RS mapping resource, and the DM-RS transmitted in the current subframe is obtained, and the corresponding definition of Rel-10 can be reused.
  • the DM-RS corresponding to the DM-RS antenna port de-spreads the DM-RS to ensure orthogonality between antenna ports using the same resource mapping mode.
  • the first two OFDM symbols including the RE used for transmitting the DM-RS, and the transmission DM-RS corresponding to the same subcarrier number The two REs used are grouped together, and the latter two contain the OFDM symbols of the RE used for transmitting the DM-RS, corresponding to the same sub-
  • the two numbers of REs used by the DM-RS are transmitted as a group.
  • the DM-RS transmitted on each group of REs uses the time domain of the current DM-RS antenna port corresponding to the current DM-RS antenna port.
  • the cross-spreading sequence is despread to obtain the DM-RS transmitted on the current antenna port; or
  • the first two OFDM symbols including the RE used for transmitting the DM-RS, and the transmission DM-RS corresponding to the adjacent subcarrier number Two REs are used as one group, and the last two are OFDM symbols for transmitting REs used by DM-RSs, and two REs used for transmitting DM-RSs corresponding to adjacent subcarrier numbers are used as a group.
  • the DM-RS transmitted on the group RE is despread by using a time domain orthogonal spreading sequence of length 2 corresponding to the current DM-RS antenna port defined by the LTE system version 10 to obtain the DM transmitted on the current antenna port. RS; or,
  • the two REs used for the transmission DM-RS corresponding to the same subcarrier number are grouped as a group, and the DM transmitted on each group of REs is used.
  • the RS is despread by using a time domain orthogonal spreading sequence of length 2 corresponding to the current DM-RS antenna port defined by the LTE system version 10 to obtain the DM-RS transmitted on the current antenna port; or
  • the transmission DM-RS on each OFDM including the DM-RS mapping resource is used, and is the most adjacent in the frequency domain.
  • the two REs are used as a group, and the DM-RS transmitted on each group of REs is despread by using a time domain orthogonal spreading sequence of length 2 corresponding to the current DM-RS antenna port defined by the LTE system version 10. To obtain the DM-RS transmitted on the current antenna port.
  • the terminal obtains the determined DM-RS mapping resource, and obtains the DM-RS transmitted in the current subframe.
  • the specific implementation may be as follows:
  • the first four OFDM symbols including the RE used for transmitting the DM-RS correspond to the same subcarrier number or adjacent subcarrier number.
  • the four REs used for transmitting the DM-RS are grouped as one group, and the last four are included on the OFDM symbol of the RE used for transmitting the DM-RS (ie, the DM-RS corresponding to the original Rel-10 resource mapping manner or the corresponding original Rel- 10 DM-RSs in the resource mapping mode (DM-RS after time/frequency domain translation), and 4 REs used in the transmission DM-RS corresponding to the same subcarrier number or adjacent subcarrier number;
  • the DM-RS transmitted on one of the REs is despread using a time domain orthogonal spreading sequence of length 4 corresponding to the current DM-RS antenna port defined by the LTE system version 10, and transmitted to another group of REs.
  • the DM-RS performs despreading by using a time domain orthogonal spreading sequence obtained by transforming a time domain orthogonal spreading sequence of length 4 corresponding to the current DM-RS antenna port defined in the LTE system version 10, Get the DM-RS transmitted on the current antenna port.
  • one set of DM-RSs in the original Rel-10 resource mapping manner uses an orthogonal sequence in the original Rel-10, and a set of DMs that only partially include the DM-RS in the original Rel-10 resource mapping manner.
  • -RS uses the transformed orthogonal sequence to ensure compatibility with legacy terminals.
  • the transformed time-domain orthogonal spreading sequence is: the first two spreading factors and the last two extensions of the time-domain orthogonal spreading sequence of length 4 defined by the LTE system version 10. After the frequency factor is exchanged, the obtained time domain orthogonal spreading sequence; or
  • the time-domain orthogonal spreading sequence obtained after the transform is: the length defined by the LTE system version 10.
  • the last spreading factor in the time domain orthogonal spreading sequence of 4 is used as the first spreading factor, and the other spreading factors are sequentially shifted back to obtain the time domain orthogonal spreading sequence, or the LTE system version 10 is defined.
  • the first spreading factor in the time domain orthogonal spreading sequence of length 4 is used as the last spreading factor, and the other spreading factors are sequentially advanced to obtain the time domain orthogonal spreading sequence.
  • step 41 the terminal only needs to determine the DM-RS mapping resource, and obtain the DM-RS transmitted in the current subframe, and the specific implementation may be as follows:
  • the RE used for transmitting the DM-RS is added to two OFDM symbols in the first N OFDM symbols of the current subframe, then on each antenna port where the DM-RS transmission is located in the current subframe,
  • the two REs used in the transmission DM-RS corresponding to the same subcarrier number or adjacent subcarrier number are included as one on each of the plurality of OFDM symbols including the RE used for transmitting the DM-RS.
  • the DM-RS transmitted on each group of REs is despread using a time-domain orthogonal spreading sequence of length 2 corresponding to the current DM-RS antenna port defined in the LTE system version 10 to obtain transmission on the current antenna port.
  • DM-RS or,
  • the RE used for transmitting the DM-RS is added to one of the first N OFDM symbols of the current subframe, then on each antenna port where the DM-RS transmission is located in the current subframe,
  • the DM-RS transmitted on the RE used by the DM-RS on the current DM-RS antenna port defined in the LTE system version 10 is despreaded according to the manner defined in the LTE system version 10 to obtain the transmission on the antenna port.
  • DM-RS; and, the OFDM symbol for transmitting the RE used by the DM-RS, and the two REs used by the two closest transmission DM-RSs in the frequency domain are transmitted as a group, and are transmitted on each group of REs.
  • the DM-RS uses a time domain orthogonal spreading sequence of length 2 corresponding to the current DM-RS antenna port defined by the LTE system version 10; or, the OFDM symbol with the RE used for transmitting the DM-RS is added with LTE
  • the first OFDM symbol defined in the system version 10, which includes the RE used for transmitting the DM-RS, corresponds to the same subcarrier number or two REs of the adjacent subcarrier number as a group, and the DM transmitted on each group of REs -RS is defined for LTE system version 10
  • Current DM-RS antenna port corresponding to a length obtained after transforming time domain orthogonal spreading sequence of time-domain despreading orthogonal spreading sequence to obtain a DM-RS transmission on antenna port.
  • the transformed time-domain orthogonal spreading sequence may be: a length obtained by exchanging two spreading factors in a time-domain orthogonal spreading sequence of length 2 defined by the LTE system version 10.
  • step 41 the terminal acquires the resource according to the determined DM-RS mapping resource.
  • the specific implementation of the DM-RS transmitted in the current subframe can be as follows:
  • each antenna port where the DM-RS transmission is located in the current subframe it will include multiple REs corresponding to the REs used by the DM-RS, and corresponding to the two adjacent subcarrier numbers.
  • the DM-RS transmitted on each group of REs is despread using a time-domain orthogonal spreading sequence of length 4 corresponding to the DM-RS antenna port defined in the LTE system version 10 to obtain the antenna.
  • the DM-RS transmitted on the port is
  • step 41 the terminal acquires the DM-RS transmitted in the current subframe according to the determined DM-RS mapping resource.
  • the specific implementation may be as follows:
  • each antenna port where the DM-RS transmission is located in the current subframe it will contain 2 REs corresponding to the adjacent two subcarrier numbers on each OFDM symbol of the RE used for transmitting the DM-RS.
  • the DM-RS transmitted on each group of REs is despread by using a time domain orthogonal spreading sequence of length 2 corresponding to the current DM-RS antenna port defined by the LTE system version 10 to obtain the antenna.
  • the DM-RS transmitted on the port is
  • the current subframe is a regular downlink subframe or a special subframe configured corresponding to any one of the TDD special subframes.
  • N is a positive integer not exceeding 4; and/or, when the current subframe is a special subframe, N is a positive integer not exceeding 2 or 3.
  • the overall method of interaction between the terminal and the base station is as follows:
  • Step 1 The base station determines, according to the DM-RS resource mapping manner, the mapping resource of the DM-RS in the current subframe.
  • the DM-RS mapping resource includes at least one of the first N OFDM symbols of the current subframe.
  • N is an integer not less than 1;
  • Step 2 The base station maps the DM-RS to the current subframe according to the determined DM-RS mapping resource.
  • Step 3 The terminal determines the mapping resource of the DM-RS in the current subframe according to the DM-RS resource mapping manner.
  • the DM-RS mapping resource includes at least one of the first N OFDM symbols of the current subframe.
  • N is an integer not less than 1;
  • Step 4 The terminal acquires the DM-RS transmitted in the current subframe according to the determined DM-RS mapping resource.
  • the DM-RS resource mapping mode used by the base station is the same as that of the DM-RS resource mapping mode used by the terminal.
  • the DM-RS transmission method for the base station side includes the following steps: Step 50: The base station determines, according to the DM-RS resource mapping manner, the mapping resource of the DM-RS in the current subframe,
  • the DM-RS mapping resource includes at least one of the first N OFDM symbols of the current subframe.
  • N is an integer not less than 1;
  • Step 51 The base station maps the DM-RS into the current subframe according to the determined DM-RS mapping resource, that is, transmits the DM-RS on the determined DM-RS mapping resource.
  • the base station determines the mapping resource of the DM-RS in the current subframe according to the DM-RS resource mapping manner, and the specific implementation may use one of the following four methods:
  • Method 1 The base station is based on a pre-agreed rule and a DM-RS resource mapping party defined in the LTE system version 10. In the time domain and/or the translation in the frequency domain, on the antenna port where the DM-RS transmission is located in the current subframe, the RE corresponding to the DM-RS on the DM-RS antenna port defined in the LTE system version 10 And a part of the REs in the set is moved to at least one of the first N OFDM symbols of the subframe, and the moved RE and the remaining RE that are not moved are used as the DM-RS on the antenna port in the current subframe. Mapping resource;
  • Method 2 The base station performs at least one OFDM symbol in the first N OFDM symbols on the antenna port where the DM-RS transmission is located in the current subframe based on the pre-agreed rules and the DM-RS resource mapping manner defined in the LTE system version 10. Adding an RE used for transmitting the DM-RS, and adding the RE and the RE corresponding to the DM-RS on the DM-RS antenna port defined in the LTE system version 10 as the DM-RS in the current subframe.
  • mapping resource or the RE to be added, and the RE corresponding to the DM-RS on the DM-RS antenna port defined in the LTE system version 10, the RE corresponding to the translated DM-RS in the time domain and/or the frequency domain
  • mapping resource of the DM-RS on the antenna port in the current subframe
  • Method 3 The base station determines a mapping mode of the DM-RS resource according to the actual needs, and determines the mapping resource on the antenna port where the DM-RS is transmitted in the current subframe according to the DM-RS resource mapping manner, and passes the high layer signaling.
  • the physical downlink control channel PDCCH sends configuration information to the terminal, where the configuration information indicates a DM-RS resource mapping manner, or indicates whether a DM-RS mapping resource exists in the first N OFDM symbols of one subframe;
  • Method 4 The base station determines, according to a predefined DM-RS resource mapping manner, a mapping resource on an antenna port where the DM-RS is transmitted in the current subframe, where the predefined DM-RS resource mapping manner satisfies at least: A DM-RS mapping resource exists on at least one of the first N OFDM symbols of the frame.
  • the eNB determines a mapping mode of the DM-RS resource according to the actual needs, and determines, according to the DM-RS resource mapping manner, the mapping resource on the antenna port where the DM-RS is transmitted in the current subframe, and passes the high-layer signaling.
  • the PDCCH sends configuration information to the terminal, and the specific implementation may be one of the following three solutions:
  • Solution 1 The base station determines whether there is a DM-RS mapping resource in the first N OFDM symbols of the current subframe according to actual needs, and when it is determined to exist, based on the pre-agreed rules and the DM-RS resource mapping defined in the LTE system version 10
  • the DM-RS corresponding RE on the DM-RS antenna port defined in the LTE system version 10 is determined by the translation in the time domain and/or the frequency domain on the antenna port where the DM-RS transmission is located in the current subframe.
  • a part of the REs in the set is moved to at least one of the first N OFDM symbols of the subframe, and the moved RE and the remaining RE that are not moved are used as the DM-RS on the antenna port in the current subframe.
  • a mapping resource and transmitting, by using the high layer signaling or the PDCCH, configuration information indicating whether a DM-RS mapping resource exists in the first N OFDM symbols of one subframe (specifically indicating presence);
  • Solution 2 The base station determines, according to actual needs, whether there is a DM-RS mapping resource in the first N OFDM symbols of the current subframe, and when it is determined to exist, based on the pre-agreed rule and the DM-RS resource mapping defined in the LTE system version 10 In a manner, the RE used for transmitting the DM-RS is added to at least one of the first N OFDM symbols on the antenna port where the DM-RS transmission is located in the current subframe, and the added RE and the LTE system version 10 are added.
  • the RE corresponding to the DM-RS on the RS port passes the RE corresponding to the translated DM-RS in the time domain and/or the frequency domain, and acts as a mapping resource on the antenna port of the DM-RS in the current subframe, and passes
  • the high layer signaling or the PDCCH sends, to the terminal, configuration information indicating whether a DM-RS mapping resource exists in the first N OFDM symbols of one subframe (specifically indicated as being present);
  • Solution 3 The base station selects a pre-defined DM-RS resource mapping manner from a plurality of predefined DM-RS resource mapping manners according to actual needs, and determines the pre-defined DM-RS resource mapping manner according to the selected base station.
  • the DM-RS transmits the mapping resource on the antenna port where the DM-RS is located in the current subframe, and sends configuration information of a predefined DM-RS resource mapping manner for indicating the selection to the terminal through the high layer signaling or the PDCCH, or
  • the high layer signaling or the PDCCH sends, to the terminal, configuration information (specifically indicated as being present) indicating whether the DM-RS mapping resource exists in the first N OFDM symbols of one subframe.
  • the predefined DM-RS resource mapping manner is defined as follows:
  • Manner 1 Move part of the REs in the RE set corresponding to the DM-RS on each DM-RS antenna port defined in the LTE system version 10 in one subframe to one through a translation in the time domain and/or the frequency domain. a DM-RS resource mapping manner obtained on at least one of the first N OFDM symbols on the antenna port in the subframe;
  • Manner 2 The DM-RS resource mapping manner corresponding to each DM-RS antenna port defined in the LTE system version 10 is increased in at least one OFDM symbol of the first N OFDM symbols on the antenna port in one subframe.
  • the RE corresponding to the RS as a DM-RS resource mapping manner obtained by the DM-RS in the mapping resource on the antenna port in the current subframe;
  • Manner 3 On each DM-RS antenna port in one subframe, the OFDM symbols in which DM-RS mapping resources are present are not adjacent, and at least one group on the OFDM symbols is corresponding to at least two neighbors.
  • a DM-RS mapping resource composed of REs of subcarrier numbers.
  • the base station maps the DM-RS to the current subframe according to the determined DM-RS mapping resource, and the specific implementation may be as follows:
  • the base station maps the DM-RS to the current subframe according to the determined DM-RS mapping resource, and the specific implementation may be as follows:
  • the first two OFDM symbols including the RE used for transmitting the DM-RS, and the transmission DM-RS corresponding to the same subcarrier number Two REs are used as a group, and the last two are OFDM symbols including REs used for transmitting DM-RSs, and two REs used for transmitting DM-RSs corresponding to the same subcarrier number are grouped as a group for each group of REs.
  • the uplink DM-RS is spread using a time domain orthogonal spreading sequence of length 2 corresponding to the current DM-RS antenna port defined by the LTE system version 10 to transmit the DM-RS on the antenna port; or
  • the first two OFDM symbols including the RE used for transmitting the DM-RS, and the transmission DM-RS corresponding to the adjacent subcarrier number Two REs are used as one group, and the last two are OFDM symbols for transmitting REs used by DM-RSs, and two REs used for transmitting DM-RSs corresponding to adjacent subcarrier numbers are used as a group.
  • the DM-RS transmitted on the group RE is spread using a time domain orthogonal spreading sequence of length 2 corresponding to the current DM-RS antenna port defined by the LTE system version 10, to transmit the DM-RS on the antenna port; Or,
  • the two REs used for the transmission DM-RS corresponding to the same subcarrier number are grouped as a group, and the DM transmitted on each group of REs is used.
  • -RS is spread using a time domain orthogonal spreading sequence of length 2 corresponding to the current DM-RS antenna port defined by the LTE system version 10 to transmit the DM-RS on the antenna port; or
  • the transmission DM-RS on each OFDM including the DM-RS mapping resource is used, and is the most adjacent in the frequency domain.
  • the two REs are grouped together, and the DM-RS transmitted on each group of REs is spread using a time domain orthogonal spreading sequence of length 2 corresponding to the current DM-RS antenna port defined by the LTE system version 10,
  • the DM-RS is transmitted on the antenna port.
  • the base station maps the DM-RS to the current subframe according to the determined DM-RS mapping resource, and the specific implementation may be as follows:
  • the first four OFDM symbols including the RE used for transmitting the DM-RS correspond to the same subcarrier number or adjacent subcarrier number.
  • the four REs used for transmitting the DM-RS are grouped, and the last four OFDM symbols including the RE used for transmitting the DM-RS are used by the transmission DM-RS corresponding to the same subcarrier number or adjacent subcarrier number.
  • the time-domain orthogonal spreading sequence obtained after the transformation is: the first two spreading factors of the time-domain orthogonal spreading sequence of length 4 defined by the LTE system version 10, and the last two After the position of the spreading factor is exchanged, the obtained time domain orthogonal spreading sequence; or
  • the time-domain orthogonal spreading sequence obtained after the transformation is: defined by the LTE system version 10.
  • the last spreading factor in the time domain orthogonal spreading sequence of length 4 is used as the first spreading factor, and the other spreading factors are sequentially shifted back to obtain the time domain orthogonal spreading sequence, or the LTE system version is used.
  • the first spreading factor in the time-domain orthogonal spreading sequence of length 4 defined by 10 is used as the last spreading factor, and the other spreading factors are sequentially forwarded to obtain the time-domain orthogonal spreading sequence.
  • the base station maps the DM-RS to the current subframe according to the determined DM-RS mapping resource, and the specific implementation may be as follows:
  • the RE used for transmitting the DM-RS is added to two OFDM symbols in the first N OFDM symbols of the current subframe, then on each antenna port where the DM-RS transmission is located in the current subframe,
  • the two REs used in the transmission DM-RS corresponding to the same subcarrier number or adjacent subcarrier number are included as one on each of the plurality of OFDM symbols including the RE used for transmitting the DM-RS.
  • the DM-RS transmitted on each group of REs is spread using a time domain orthogonal spreading sequence of length 2 corresponding to the current DM-RS antenna port defined by the LTE system version 10, for transmission on the antenna port.
  • DM-RS or,
  • the RE used for transmitting the DM-RS is added to one of the first N OFDM symbols of the current subframe, then on each antenna port where the DM-RS transmission is located in the current subframe,
  • the DM-RS transmitted on the RE used by the DM-RS on the current DM-RS antenna port defined in the LTE system version 10 is spread according to the manner defined in the LTE system version 10 to transmit the DM on the antenna port.
  • the OFDM symbol for transmitting the RE used for transmitting the DM-RS uses a time domain orthogonal spreading sequence of length 2 corresponding to the current DM-RS antenna port defined by the LTE system version 10; or, the OFDM symbol with the RE used for transmitting the DM-RS and the LTE system version are added
  • the first OFDM symbol defined in 10 which includes the RE used for transmitting the DM-RS, corresponds to the same subcarrier number or two REs of adjacent subcarrier numbers as a group, and the DM-RS transmitted on each group of REs is used.
  • Current D defined for LTE system version 10
  • the time domain orthogonal spreading sequence obtained by transforming the time domain orthogonal spreading sequence corresponding to length 2 corresponding to the M-RS antenna port is spread to transmit the DM-RS on the antenna port.
  • the transformed time-domain orthogonal spreading sequence is: a length obtained by exchanging two spreading factors in a time-domain orthogonal spreading sequence defined by the LTE system version 10 and having a length of 2 A time domain orthogonal spreading sequence of 2.
  • the base station maps the DM-RS to the current subframe according to the determined DM-RS mapping resource, and the specific implementation may be as follows: For a regular CP, on each antenna port where the DM-RS transmission is located in the current subframe, it will include multiple REs corresponding to the REs used by the DM-RS, and corresponding to the two adjacent subcarrier numbers. As a group, the DM-RS transmitted on each group of REs is spread using a time domain orthogonal spreading sequence of length 4 corresponding to the current DM-RS antenna port defined by the LTE system version 10, to be at the antenna port. The DM-RS is transmitted on.
  • the base station maps the DM-RS to the current subframe according to the determined DM-RS mapping resource, and the specific implementation may be as follows:
  • each antenna port where the DM-RS transmission is located in the current subframe it will contain 2 REs corresponding to the adjacent two subcarrier numbers on each OFDM symbol of the RE used for transmitting the DM-RS.
  • the DM-RS transmitted on each group of REs is spread using a time-domain orthogonal spreading sequence of length 2 corresponding to the current DM-RS antenna port defined by the LTE system version 10, to be at the antenna port.
  • the DM-RS is transmitted on.
  • the current subframe is a regular downlink subframe or a special subframe configured corresponding to any one of the TDD special subframes.
  • N is a positive integer not exceeding 4; and / or,
  • N is a positive integer not exceeding 2 or a positive integer not exceeding 3.
  • the TDD special subframe configuration in the Rel-10 that does not support the DM-RS transmission
  • the TDD special subframe configuration is 0 and 5
  • the DM-RS resource mapping manner corresponding to any TDD special subframe configuration obtained in the foregoing manner may be used, and the DM-RS is transmitted or received according to the DM-RS resource mapping manner only in the OFDM symbol in which the DwPTS is located.
  • the DM-RS resource mapping manner in the present application should avoid overlapping the OFDM symbol where the DM-RS mapping resource is located and the OFDM symbol including the CRS mapping resource as much as possible; when there is synchronization on the NCT When the signal is transmitted, the DM-RS resource mapping manner should avoid overlapping the OFDM symbol where the DM-RS mapping resource is located and the OFDM symbol where the synchronization signal mapping is transmitted.
  • the high layer signaling in this application may be Media Access Control (MAC) signaling, or Radio Resource Control (RRC) signaling, etc.; the PDCCH signaling may be legacy PDCCH signaling, or E - PDCCH signaling, etc.
  • the antenna port of the transmission DM-RS in this application may be the antenna port 7 ⁇ 14.
  • Embodiment 1 Corresponding to the above method one or solution one or mode one;
  • the DM-RS mapping resource in the DM-RS resource mapping manner of the corresponding antenna port in Rel-10 is translated in the time domain to obtain a picture.
  • Mode 1 Translate the first two columns of DM-RS mapping resources in Rel-10 onto the 2nd and 3rd OFDM symbols (or 3rd and 4th OFDM symbols), and get Figure 6a (under regular CP) and Figure 6b (under extended CP);
  • Mode 2 Panning the last column of DM-RS mapping resources in Rel-10 onto the 2nd OFDM symbol (or 3rd OFDM symbol), resulting in Figure 6c (under conventional CP) and graph 6d (under extended CP);
  • Manner 3 The first two columns of DM-RS mapping resources in Rel-10 are translated onto the first and second OFDM symbols (or the second and third OFDM symbols), and the last two columns of DM-RS mapping resources are translated. On the second and third OFDM symbols, the figure 6e (under the regular CP) and the figure 6f (under the extended CP) are obtained;
  • Manner 4 Translating the first two columns of DM-RS mapping resources in Rel-10 onto the 2nd and 3rd OFDM symbols (or the 1st and 2nd OFDM symbols, or the 3rd and 4th OFDM symbols), and The last two columns of DM-RS mapping resources are translated onto the last 4th and 5th OFDM symbols (or the 5th and 6th OFDM symbols) to obtain Figure 6g (under regular CP) and Figure 6h (under extended CP). ;
  • Manner 5 Translating the first two columns of DM-RS mapping resources in Rel-10 onto the 2nd and 3rd OFDM symbols (or the 1st and 2nd OFDM symbols, or the 3rd and 4th OFDM symbols), and The last two columns of DM-RS mapping resources are respectively translated onto the fourth and second OFDM symbols, resulting in Figure 6i (under conventional CP) and Figure 6j (under extended CP).
  • Mode 1 can avoid the overlap of the synchronization signal and the DM-RS resource in the FDD system.
  • Mode 2 avoids the overlap of the synchronization signal and the DM-RS resource in the TDD system.
  • mode 3 can avoid overlapping of the synchronization signal and the DM-RS resource in the FDD and TDD systems, or can be defined when the CRS is present on the NCT and the CRS is different from the synchronization signal transmission subframe. Mode 3 is used in the synchronization signal transmission subframe, and other methods or methods can be used for other subframes.
  • Mode 4 and mode 5 can avoid overlapping of the synchronization signal and the DM-RS resource in the FDD and the TDD system, but when the CSI-RS transmission exists on the NCT, the mapping resource of the CSI-RS on the OFDM symbol where the DM-RS is located needs to be restricted. .
  • a DM-RS corresponding to the same subcarrier number in one downlink subframe is used as a group, and corresponding DM-RS antenna ports in Rel-10 are reused for each group of DM-RSs.
  • a time domain orthogonal spreading sequence of length 4 ie, the sequence in Table 1;
  • the first two DM-RSs corresponding to the same subcarrier number on the OFDM symbol including the DM-RS in one downlink subframe are grouped, and the latter two include the DM-RS.
  • a DM-RS corresponding to the same subcarrier number on the OFDM symbol is used as a group, and a time-domain orthogonal spreading sequence of length 2 corresponding to the corresponding DM-RS antenna port in Rel-10 is reused for each group of DM-RSs (ie, a table)
  • the first two DM-RSs corresponding to adjacent subcarrier numbers on the OFDM symbols of the DM-RS in one downlink subframe are regarded as one group, and the latter two
  • the DM-RS corresponding to the adjacent subcarrier number on the OFDM symbol including the DM-RS is used as a group, and the time domain orthogonality corresponding to the corresponding DM-RS antenna port in the Rel-10 is reused for each group of DM-RSs.
  • a spreading sequence (i.e., a sequence in Table 2), for example, for Figure 6d, the DM-RSs of the first two OFDM symbols containing DM-RSs with corresponding subcarriers numbered i and i+1 (e.g., kl and k2) are used as a group, using the sequence in Table 2; or, in the DM-RS resource mapping manner, one downlink subframe corresponds to the same subcarrier
  • the DM-RS as a group each group DM-RS reuse DM-RS antenna port corresponding to the length of the corresponding Rel-10 as a time domain orthogonal 2 a spreading sequence (ie, a sequence in Table 2), for example, for Figure 6d, the first and last DM-RSs containing the same subcarrier number on the OFDM symbol containing the DM-RS as a group, the second sum
  • the third DM-RS corresponding to the same subcarrier number on the OFDM symbol of the DM-RS is used as a group, and the
  • Embodiment 2 Corresponding to the first method or the first method or the first method;
  • the DM-RS mapping resource in the DM-RS resource mapping mode of the corresponding antenna port in the Rel-10 is translated in the time domain to obtain the DM-RS resource mapping manner as shown in FIG. 7a to FIG. 7i. ;
  • mode 1 shifting the first two columns of DM-RS mapping resources in Rel-10 to the first and second OFDM symbols, resulting in Figure 7a;
  • Manner 2 The first two columns of DM-RS mapping resources in Rel-10 are translated to the first and second OFDM symbols, and 1/2/6/7 is configured for the special subframe to map the last two columns of DM-RS mapping resources. Rear shifting 2 OFDM symbols (or backward shifting 1 OFDM symbol), resulting in Figure 7b;
  • Mode 3 Translating the first two columns of DM-RS mapping resources in Rel-10 into the 2nd and 3rd OFDM symbols, and obtaining Figure 7c;
  • Mode 1 The first column of DM-RS mapping resources in Rel-10 is translated to the first OFDM symbol (or can also be moved to the 2nd or 3rd OFDM symbol) to obtain Figure 7d;
  • Manner 2 Panning the first column of DM-RS mapping resources in Rel-10 to the first OFDM symbol, and shifting the second column of DM-RS mapping resources backwards by 2 OFDM symbols (or backward shifting 1 OFDM symbol) Figure 7e;
  • Mode 3 Translating the first column of DM-RS mapping resources in Rel-10 to the second OFDM symbol, and shifting the second column of DM-RS mapping resources backward by 2 OFDM symbols to obtain a graph 7f;
  • the mode 1 in the extended CP can avoid the overlap of the synchronization signal and the DM-RS resource in the FDD system;
  • Time domain orthogonal spread spectrum In the case of a normal CP, the DM-RS on the RE corresponding to the same subcarrier number on the two OFDM symbols including the DM-RS in the time domain in one subframe can be regarded as 1 Group, for each group, reuse the corresponding time-domain orthogonal spreading sequence of length 2 corresponding to the corresponding DM-RS antenna port defined by Rel-10, that is, the sequence in Table 2, to ensure that the antenna port using the same resource mapping mode is used.
  • the DM-RS corresponding to the RE of the same subcarrier number is used as a group, and the time domain orthogonal spreading sequence of length 2 corresponding to the corresponding DM-RS antenna port defined by Rel-10 is reused for each group, that is, Table 2
  • Embodiment 3 Corresponding to the above method 2 or scheme 2 or mode 2;
  • the subcarrier position where the DM-RS mapping resource is located in the downlink normal subframe the second and third in one subframe Adding a DM-RS mapping resource to the OFDM symbol, and obtaining a DM-RS resource mapping manner as shown in FIG. 8a;
  • the subcarrier position of the DM-RS mapping resource on the first two or the last two OFDM symbols of the DM-RS mapping resource is included in the DM-RS resource mapping manner of the corresponding antenna port in Rel-10.
  • the DM-RS mapping resource is added as described above.
  • DM-RSs corresponding to the same subcarrier number on the OFDM symbol are used as another group, and 4 DM-RSs in each group use orthogonal spreading sequences in Rel-10; for FIG. 8b, FIG.
  • the numbered DM-RSs are respectively a group, and the two DM-RS symbols in each group use the orthogonal spreading sequence in Table 2.
  • Orthogonal sequence port P in the orthogonal sequence Rel-10 after antenna position conversion (0) w p (l) w p (2) w p (3) " (0) w p ( ⁇ ) w p (2) w p (3)
  • Embodiment 4 Corresponding to the above method 2 or scheme 2 or mode 2;
  • the subcarrier position where the DM-RS mapping resource is located in the DM-RS resource mapping manner of the corresponding antenna port in Rel-10, on the second OFDM symbol in one subframe Add the DM-RS mapping resource to obtain the DM-RS resource mapping mode as shown in Figure 9a.
  • the subcarrier position of the DM-RS mapping resource on the first two or the last two OFDM symbols of the DM-RS mapping resource is included in the DM-RS resource mapping manner of the corresponding antenna port in Rel-10.
  • the DM-RS mapping resources are added as described above.
  • 4 DM-RS symbols in each group use the sequence in Table 4;
  • the DM-RSs on the OFDM symbols are grouped into two groups in the frequency domain.
  • the DM-RS uses the sequence in Rel-10.
  • Embodiment 5 Corresponding to the above method 2 or scheme 2 or mode 2;
  • the first and second in one subframe The DM-RS mapping resource is added to the OFDM symbol to obtain the DM-RS resource mapping manner as shown in FIG. 10a, or the DM-RS mapping resource is added to the 2nd and 3rd OFDM symbols in one subframe, as shown in FIG. 10b.
  • the DM-RS resource mapping manner is shown, or the DM-RS mapping resource is added to the first OFDM symbol in one subframe, and the DM-RS resource mapping manner as shown in FIG. 10c is obtained, or in a subframe.
  • the DM-RS mapping resource is added to the OFDM symbol to obtain the DM-RS resource mapping manner as shown in FIG. 10d (the DM-RS mapping resource may also be added in the foregoing manner on the third OFDM symbol), or According to the subcarrier position where the DM-RS mapping resource is located in the DM-RS resource mapping manner of the corresponding antenna port in the Rel-10, the DM-RS mapping resource is added to the first and second OFDM symbols in one subframe.
  • DM-RS pattern The DM-RS mapping resource in the DM-RS resource mapping mode of the corresponding antenna port in the Rel-10 is further translated in the time domain/frequency domain, for example, the DM-RS mapping resource of the corresponding antenna port in the original Rel-10. Translating two OFDM symbols to the right to obtain a DM-RS resource mapping manner as shown in FIG. 10e; or
  • the DM-RS subcarrier position on the first and second OFDM symbols in one subframe relative to the corresponding antenna port in Rel-10 is shifted upward by one in the frequency domain.
  • the DM-RS subcarrier position on the first and second OFDM symbols in one subframe relative to the corresponding antenna port in Rel-10 is shifted upward by one in the frequency domain.
  • the DM-RS mapping resource is added to the frequency domain of the carrier unit, and the DM-RS mapping resource of the corresponding antenna port in the original Rel-10 is further translated to the right by two OFDM symbols, and the DM-RS resource mapping as shown in FIG. 10h is obtained.
  • the mode, or the frequency domain position of the DM-RS subcarrier position relative to the corresponding antenna port in the Rel-10 in the one-frame is shifted upward by one sub-carrier unit in the frequency domain.
  • the DM-RS maps the resources, and further translates the DM-RS mapping resources of the corresponding antenna ports in the original Rel-10 to the right by two OFDM symbols, and obtains the DM-RS resource mapping manner as shown in FIG. 10i.
  • the DM-RS symbol uses an orthogonal spreading sequence of length 2 in Rel-10; the DM-RS on the 1st or 2nd OFDM symbol of the DM-RS is added to the frequency domain in pairs of FIG. 10c and FIG. 10d.
  • 2 DM-RSs in each group use Table 2
  • the DM-RSs of the subcarrier numbers are grouped into one group, and the two DM-RSs in each group use the orthogonal spreading sequence of length 2 in Rel-10.
  • Embodiment 6 Corresponding to the above manner 3;
  • the DM-RS resource mapping manner shown in FIG. 11a to FIG. 1 id may be used; or, in the same frequency domain location in the figure, the first or the first slot in the first slot may be used.
  • 3 OFDM symbols the regular CP may also be on the 4th OFDM symbol of the first slot
  • the second last OFDM symbol in the second slot or the 1st or 2nd in the second slot
  • the DM-RS mapping resource is placed on the 3rd OFDM symbol (the regular CP can also be on the 4th OFDM symbol of the second slot).
  • the DM-RSs corresponding to the subcarrier numbers kO and k1 are used as one group, and the four DM-RS symbols in each group use the orthogonal spreading sequence in Table 1; for the graph lib ⁇ picture lid, one subframe A DM-RS corresponding to two adjacent subcarrier numbers on each OFDM symbol of the DM-RS is included as
  • the DM-RSs of k1 and k2 are taken as one group, and the two DM-RS symbols in each group use the orthogonal spreading sequence in Table 2, or, for the graph lib and FIG. 11c, the DM-RS is included in one subframe.
  • DM-RSs corresponding to the same subcarrier number on two OFDM symbols as a group for example, in FIG.
  • This scheme can avoid overlapping of synchronization signals and DM-RS resources in FDD and TDD systems.
  • Embodiment 7 Corresponding to the above manner 3;
  • the DM-RS resource mapping manner shown in FIG. 12a to FIG. 12d may be used; or, the first OFDM symbol in the first slot may be according to the same frequency domain position in the illustration.
  • the regular CP can also place the DM-RS mapping resource on the last OFDM symbol of the first slot, the last one in the first slot, or the second to last OFDM symbol.
  • the time domain orthogonal spreading is similar to the conventional downlink subframe in the sixth embodiment.
  • This scheme can avoid overlapping of synchronization signals and DM-RS resources in FDD and TDD systems.
  • the TDD special subframe in the special subframe configuration 9 uses the DM-RS resource mapping manner corresponding to the TDD special subframe configuration 8 defined in the foregoing method, and only the OFDM symbol set corresponding to the DwPTS of the special subframe There is a DM-RS transmission.
  • the foregoing DM-RS resource mapping mode may be used in combination with the DM-RS overhead reduction scheme, and the DM-RS resource mapping manner with reduced cost or the DM-RS resource mapping manner may be selected by using an appointment rule or a high-level configuration information.
  • the DM-RS resource mapping manner with reduced overhead may also be obtained by performing time domain and/or frequency domain truncation on the DM-RS resource mapping manner in this patent according to pre-agreed rules or high-level configuration information.
  • an embodiment of the present application provides a terminal, where the terminal includes:
  • the resource mapping unit 70 is configured to determine a mapping resource of the DM-RS in the current subframe according to the DM-RS resource mapping manner, where the DM-RS mapping resource includes at least the first N orthogonal frequency division multiplexing OFDM of the current subframe.
  • a resource unit RE on at least one OFDM symbol in the symbol, N is an integer not less than one;
  • the signal obtaining unit 71 is configured to obtain, according to the determined DM-RS mapping resource, a further transmission in the current subframe, where the resource mapping unit 70 is configured to: determine, according to one of the following methods, according to a DM-RS resource mapping manner Mapping resources of the DM-RS in the current subframe: Method 1: Based on the pre-agreed rules and the DM-RS resource mapping manner defined in Release 10 of the LTE system, through the translation in the time domain and/or the frequency domain, on the antenna port where the DM-RS transmission is located in the current subframe, And moving part of REs in the RE set corresponding to the DM-RS on the DM-RS antenna port defined in the LTE system version 10 to at least one OFDM symbol in the first N OFDM symbols of the subframe, and moving the RE and the remaining RE that are not moved, as the mapping resource of the DM-RS on the antenna port in the current subframe; or
  • Method 2 Based on a pre-agreed rule and a DM-RS resource mapping manner defined in Release 10 of the LTE system, at least one of the first N OFDM symbols on the antenna port where the DM-RS transmission is located in the current subframe Adding the RE used for transmitting the DM-RS, and adding the RE and the RE corresponding to the DM-RS on the DM-RS antenna port defined in the LTE system version 10 as the DM-RS on the antenna port in the current subframe Mapping the resource, or the RE corresponding to the DM-RS on the DM-RS antenna port defined in the LTE system version 10, and the RE corresponding to the translated DM-RS in the time domain and/or the frequency domain, As a mapping resource of the DM-RS on the antenna port in the current subframe; or
  • Method 3 Determine a DM-RS resource mapping manner according to the configuration information carried by the high-layer signaling or the physical downlink control channel PDCCH, and determine, according to the determined DM-RS resource mapping manner, that the DM-RS is transmitted in the current subframe. a mapping resource on the antenna port, where the configuration information indicates a DM-RS resource mapping manner, or indicates whether a DM-RS mapping resource exists in the first N OFDM symbols of one subframe; or
  • Method 4 Determine, according to a pre-defined DM-RS resource mapping manner, a mapping resource on an antenna port where the DM-RS is transmitted in the current subframe, where the predefined DM-RS resource mapping manner satisfies at least one subframe.
  • a DM-RS mapping resource exists on at least one of the first N OFDM symbols.
  • the resource mapping unit 70 is configured to: determine, according to one of the following methods, a DM-RS resource mapping manner according to the configuration information carried by the high layer signaling or the PDCCH, and determine the DM-RS resource according to the determined
  • the mapping mode determines the mapping resources of the DM-RS in the current subframe:
  • Method 1 Determine, according to the configuration information, whether a DM-RS mapping resource exists in the first N OFDM symbols of the current subframe, and when it is determined to exist, based on a pre-agreed rule and a DM-RS resource defined in the LTE system version 10
  • the mapping mode corresponding to the DM-RS on the DM-RS antenna port defined in the LTE system version 10, by the translation in the time domain and/or the frequency domain, on the antenna port where the DM-RS transmission is located in the current subframe.
  • a part of the REs in the RE set is moved to at least one of the first N OFDM symbols of the subframe, and the moved RE and the remaining RE that are not moved are used as the DM-RS in the current subframe.
  • Method 2 Determine, according to the configuration information, whether a DM-RS mapping resource exists in the first N OFDM symbols of the current subframe, and when it is determined to exist, based on a pre-agreed rule and a DM-RS resource defined in the LTE system version 10
  • the mapping mode increases the RE used for transmitting the DM-RS on at least one of the first N OFDM symbols on the antenna port where the DM-RS transmission is located in the current subframe, and the added RE and the LTE system version 10 Defining the RE corresponding to the DM-RS on the DM-RS antenna port, as the DM-RS in the current subframe, the antenna end
  • Method 3 Select a pre-defined DM-RS resource mapping manner indicated by the configuration information from a plurality of predefined DM-RS resource mapping manners according to the configuration information, and according to the predefined DM-
  • the RS resource mapping mode determines the mapping resource on the antenna port where the DM-RS is transmitted in the current subframe;
  • Method 4 Determine, according to the configuration information, whether a DM-RS mapping resource exists in the first N OFDM symbols of the current subframe, and when it is determined to exist, select one of the multiple predefined DM-RS resource mapping manners in one sub-frame A pre-defined DM-RS resource mapping manner of the DM-RS mapping resource exists in the first N OFDM symbols of the frame, and determines, according to the predefined DM-RS resource mapping manner, that the DM-RS is in the current subframe. The mapped resource on the antenna port where the transmission is located.
  • the predefined DM-RS resource mapping manner is as follows One of the methods is defined:
  • Method 1 move a partial RE in the RE set corresponding to the DM-RS on each DM-RS antenna port defined in the LTE system version 10 in one subframe by translation in the time domain and/or the frequency domain.
  • a DM-RS resource mapping manner obtained on at least one of the first N OFDM symbols on the antenna port in the subframe; or, method 2, based on each DM-RS antenna port defined in the LTE system version 10
  • Corresponding DM-RS resource mapping manner adding DM-RS corresponding RE to at least one of the first N OFDM symbols on the antenna port in one subframe, and adding the RE and the LTE system version 10
  • the DM-RS corresponding RE of the DM-RS on the DM-RS antenna port as the DM-RS resource mapping mode of the mapping resource of the DM-RS in the current subframe, or the added RE and LTE system version
  • the RE corresponding to the DM-RS on the DM-RS antenna port defined in 10 passes the RE corresponding to the translated DM-RS in the time domain
  • the third method is that, on each DM-RS antenna port in one subframe, the OFDM symbols in which the DM-RS mapping resource exists are not adjacent, and at least one group on the OFDM symbol is corresponding to at least two neighbors.
  • a DM-RS mapping resource composed of REs of subcarrier numbers.
  • the signal acquiring unit 71 is configured to: when the method 1 is used, obtain the DM-RS transmitted in the current subframe according to the determined DM-RS mapping resource according to the following method:
  • the signal acquiring unit 71 is configured to: when the method 1 is used, obtain the DM-RS transmitted in the current subframe according to the determined DM-RS mapping resource according to the following method:
  • the first two OFDM symbols including the RE used for transmitting the DM-RS, and the transmission DM-RS corresponding to the same subcarrier number Two REs are used as a group, and the last two are OFDM symbols including REs used for transmitting DM-RSs, and two REs used for transmitting DM-RSs corresponding to the same subcarrier number are grouped as a group for each group of REs.
  • the uplink DM-RS uses LTE to acquire the DM-RS transmitted on the antenna port; or
  • the first two OFDM symbols including the RE used for transmitting the DM-RS, and the transmission DM-RS corresponding to the adjacent subcarrier number Two REs are used as one group, and the last two are OFDM symbols for transmitting REs used by DM-RSs, and two REs used for transmitting DM-RSs corresponding to adjacent subcarrier numbers are used as a group.
  • the DM-RS transmitted on the group RE is despread using a time domain orthogonal spreading sequence of length 2 corresponding to the DM-RS antenna port defined in the LTE system version 10 to obtain the DM transmitted on the antenna port. RS; or,
  • the two REs used for the transmission DM-RS corresponding to the same subcarrier number are grouped as a group, and the DM transmitted on each group of REs is used.
  • -RS uses LTE to obtain the DM-RS transmitted on the antenna port; or
  • the transmission DM-RS on each OFDM including the DM-RS mapping resource is used, and is the most adjacent in the frequency domain.
  • the two REs are used as a group, and the DM-RS transmitted on each group of REs is despread by using a time-domain orthogonal spreading sequence of length 2 corresponding to the DM-RS antenna port defined in the LTE system version 10. To obtain the DM-RS transmitted on the antenna port.
  • the signal acquiring unit 71 is configured to: when the method 2 is used, obtain the DM-RS transmitted in the current subframe according to the determined DM-RS mapping resource according to the following method:
  • the first four OFDM symbols including the RE used for transmitting the DM-RS correspond to the same subcarrier number or adjacent subcarrier number.
  • the four REs used for transmitting the DM-RS are grouped, and the last four OFDM symbols including the RE used for transmitting the DM-RS are used by the transmission DM-RS corresponding to the same subcarrier number or adjacent subcarrier number.
  • the time-domain orthogonal spreading sequence obtained after the transformation is: the first two spreading factors of the time-domain orthogonal spreading sequence of length 4 defined by the LTE system version 10 a time domain orthogonal spreading sequence obtained after the last two spreading factors are exchanged positions; or
  • the time-domain orthogonal spreading sequence obtained after the transformation is: defined by the LTE system version 10.
  • the last spreading factor in the time domain orthogonal spreading sequence of length 4 is used as the first spreading factor, and the other spreading factors are sequentially shifted back to obtain the time domain orthogonal spreading sequence, or, the LTE system version 10
  • the first spreading factor in the time domain orthogonal spreading sequence of length 4 is defined as the last spreading factor, and the other spreading factors are sequentially advanced to obtain the time domain orthogonal spreading sequence.
  • the signal acquiring unit 71 is configured to: when the method 2 is used, obtain the DM-RS transmitted in the current subframe according to the determined DM-RS mapping resource according to the following method:
  • the RE used for transmitting the DM-RS is added to two OFDM symbols in the first N OFDM symbols of the current subframe, then on each antenna port where the DM-RS transmission is located in the current subframe, The two REs used in the transmission DM-RS corresponding to the same subcarrier number or adjacent subcarrier number are included as one on each of the plurality of OFDM symbols including the RE used for transmitting the DM-RS.
  • the DM-RS transmitted on each group of REs is despread using a time-domain orthogonal spreading sequence of length 2 corresponding to the DM-RS antenna port defined in the LTE system version 10, to obtain the antenna port. Transmitted DM-RS; or,
  • the RE used for transmitting the DM-RS is added to one of the first N OFDM symbols of the current subframe, then on each antenna port where the DM-RS transmission is located in the current subframe,
  • the DM-RS transmitted on the RE used for transmitting the DM-RS on the DM-RS antenna port defined in the LTE system version 10 is despreaded according to the manner defined in the LTE system version 10 to obtain the transmission on the antenna port.
  • the DM-RS uses a time domain orthogonal spreading sequence of length 2 corresponding to the DM-RS antenna port defined by the LTE system version 10; or, the OFDM symbol with the RE used for transmitting the DM-RS is added with LTE
  • the first OFDM symbol defined in the system version 10, which includes the RE used for transmitting the DM-RS, corresponds to the same subcarrier number or 2 REs of adjacent subcarrier numbers as a group, and the DM transmitted on each group of REs
  • the RS uses the DM-RS defined for LTE system version 10 Line length corresponding to the port 2 of the time domain orthogonal spreading sequence obtained after transforming time domain orthogonal spreading sequence for despreading, for DM-RS transmission on antenna port.
  • time-domain orthogonal spreading sequence obtained after the transform is:
  • a time domain orthogonal spreading sequence of length 2 obtained by exchanging positions of two spreading factors in a time domain orthogonal spreading sequence of length 2 defined by the LTE system version 10.
  • the signal acquiring unit 71 is configured to: satisfy a DM-RS resource mapping manner in a predefined manner in a On each DM-RS antenna port of the subframes, the OFDM symbols in which the DM-RS mapping resources are present are not adjacent, and at least one group on the OFDM symbols is composed of REs corresponding to at least two adjacent subcarrier numbers.
  • the DM-RS maps the resource
  • the DM-RS transmitted in the current subframe is obtained according to the determined DM-RS mapping resource according to the following method:
  • each antenna port where the DM-RS transmission is located in the current subframe it will include multiple REs corresponding to the REs used by the DM-RS, and corresponding to the two adjacent subcarrier numbers.
  • the DM-RS transmitted on each group of REs is despread using a time-domain orthogonal spreading sequence of length 4 corresponding to the DM-RS antenna port defined in the LTE system version 10 to obtain the antenna.
  • the DM-RS transmitted on the port is
  • the signal acquiring unit 71 is configured to: when each of the DM-RS antenna ports in one subframe meets the DM-RS resource mapping manner, the OFDM symbol of the DM-RS mapping resource is not adjacent. And when there are at least one group of DM-RS mapping resources composed of REs corresponding to at least two adjacent subcarrier numbers on the OFDM symbol, the current sub-acquisition is obtained according to the determined DM-RS mapping resource according to the following method: DM-RS transmitted in the frame:
  • each antenna port where the DM-RS transmission is located in the current subframe it will contain 2 REs corresponding to the adjacent two subcarrier numbers on each OFDM symbol of the RE used for transmitting the DM-RS.
  • the DM-RS transmitted on each group of REs is despread using a time-domain orthogonal spreading sequence of length 2 corresponding to the DM-RS antenna port defined in the LTE system version 10 to obtain the antenna.
  • the DM-RS transmitted on the port is
  • the current subframe is a regular downlink subframe or a special subframe configured corresponding to any one of the TDD special subframes.
  • N is a positive integer not exceeding 4; and/or, when the current subframe is a special subframe, N is a positive integer not exceeding 2 or not exceeding 3 Integer.
  • an embodiment of the present application provides a base station, where the base station includes:
  • the resource mapping unit 80 is configured to determine, according to the DM-RS resource mapping manner, a mapping resource of the DM-RS in the current subframe, where the DM-RS mapping resource includes at least the first N orthogonal frequency division multiplexing OFDM of the current subframe.
  • a resource unit RE on at least one OFDM symbol in the symbol, N is an integer not less than one;
  • the data transmission unit 81 is configured to map the DM-RS into the current subframe according to the determined DM-RS mapping resource for transmission.
  • the resource mapping unit 80 is configured to: determine, according to one of the following methods, a mapping resource of the DM-RS in the current subframe according to the DM-RS resource mapping manner:
  • Method 1 Based on the pre-agreed rules and the DM-RS resource mapping manner defined in Release 10 of the LTE system, through the translation in the time domain and/or the frequency domain, on the antenna port where the DM-RS transmission is located in the current subframe, And moving part of REs in the RE set corresponding to the DM-RS on the DM-RS antenna port defined in the LTE system version 10 to at least one OFDM symbol in the first N OFDM symbols of the subframe, and moving the RE and the remaining RE that are not moved, as the mapping resource of the DM-RS on the antenna port in the current subframe; or Method 2: Based on a pre-agreed rule and a DM-RS resource mapping manner defined in Release 10 of the LTE system, at least one of the first N OFDM symbols on the antenna port where the DM-RS transmission is located in the current subframe Adding the RE used for transmitting the DM-RS, and adding the RE and the RE corresponding to the DM-RS on the DM-RS antenna port defined in the L
  • Method 3 Determine a DM-RS resource mapping mode according to actual needs, and determine mapping resources on the antenna port where the DM-RS is transmitted in the current subframe according to the DM-RS resource mapping manner, and perform high-layer signaling or
  • the physical downlink control channel PDCCH sends configuration information to the terminal, where the configuration information indicates a DM-RS resource mapping manner, or indicates whether a DM-RS mapping resource exists in the first N OFDM symbols of one subframe; or
  • Method 4 Determine, according to a pre-defined DM-RS resource mapping manner, a mapping resource on an antenna port where the DM-RS is transmitted in the current subframe, where the predefined DM-RS resource mapping manner satisfies at least one subframe.
  • a DM-RS mapping resource exists on at least one of the first N OFDM symbols.
  • the resource mapping unit 80 is configured to: determine, according to an actual requirement, a DM-RS resource mapping manner according to an actual requirement, and determine, according to the DM-RS resource mapping manner, where the DM-RS is transmitted in the current subframe. Mapping resources on the antenna port, and sending configuration information to the terminal through high layer signaling or PDCCH:
  • Method 1 Determine whether there is a DM-RS mapping resource in the first N OFDM symbols of the current subframe according to actual needs, and when it is determined to exist, based on a pre-agreed rule and a DM-RS resource mapping manner defined in the LTE system version 10
  • the RE of the DM-RS corresponding to the DM-RS antenna port defined in the LTE system version 10 is set on the antenna port where the DM-RS transmission is located in the current subframe by the translation in the time domain and/or the frequency domain.
  • a part of the REs are moved to at least one of the first N OFDM symbols of the subframe, and the moved RE and the remaining RE that are not moved are used as the DM-RS on the antenna port in the current subframe.
  • Method 2 Determine whether there is a DM-RS mapping resource in the first N OFDM symbols of the current subframe according to actual needs, and when it is determined to exist, based on a pre-agreed rule and a DM-RS resource mapping manner defined in the LTE system version 10 Adding an RE used for transmitting the DM-RS to at least one of the first N OFDM symbols on the antenna port where the DM-RS transmission is located in the current subframe, and adding the RE and the LTE system defined in Release 10 The RE corresponding to the DM-RS on the DM-RS antenna port, as the mapping resource of the DM-RS on the antenna port in the current subframe, or the added RE and the DM-RS antenna defined in the LTE system version 10 The RE corresponding to the DM-RS on the port passes the RE corresponding to the translated DM-RS in the time domain and/or the frequency domain, and serves as the mapping resource of the DM-RS in the current subframe in the antenna port, and passes the high layer signaling. Or the PDCCH
  • Method 3 Select a pre-defined DM-RS resource mapping manner from a plurality of predefined DM-RS resource mapping manners according to actual needs, and determine DM-RS according to the predefined DM-RS resource mapping manner. Mapping resources on the antenna port where the current subframe is transmitted, and sending configuration information of a predefined DM-RS resource mapping manner indicating the selection to the terminal through the high layer signaling or the PDCCH, or by using a high layer letter The PDCCH or the PDCCH transmits, to the terminal, configuration information indicating whether the DM-RS mapping resource exists in the first N OFDM symbols of one subframe.
  • the predefined DM-RS resource mapping manner is as follows One of the methods is defined:
  • Method 1 move a partial RE in the RE set corresponding to the DM-RS on each DM-RS antenna port defined in the LTE system version 10 in one subframe by translation in the time domain and/or the frequency domain. a DM-RS resource mapping manner obtained on at least one of the first N OFDM symbols on the antenna port in the subframe; or, Method 2: Each DM-RS antenna port defined in the LTE system version 10 Corresponding DM-RS resource mapping manner, adding DM-RS corresponding RE to at least one of the first N OFDM symbols on the antenna port in one subframe, and adding the RE and the LTE system version 10 The DM-RS corresponding RE of the DM-RS on the DM-RS antenna port, as the DM-RS resource mapping mode of the mapping resource of the DM-RS in the current subframe, or the added RE and LTE system version The RE corresponding to the DM-RS on the DM-RS antenna port defined in 10 passes the RE corresponding to the translated DM-RS in the time domain and/or the frequency domain, and
  • Method 3 Having OFDM symbols that are present in the DM-RS mapping resource are not adjacent on each DM-RS antenna port in one subframe, and at least one group on the OFDM symbol is corresponding to at least two neighbors A DM-RS mapping resource composed of REs of subcarrier numbers.
  • the data transmission unit 81 is configured to: when the method 1 is used, map the DM-RS into the current subframe according to the determined DM-RS mapping resource according to the following method:
  • the DM-RS transmitted on each group of REs is spread using a time-domain orthogonal spreading sequence of length 4 corresponding to the DM-RS antenna port defined by the LTE system version 10, to transmit on the antenna port.
  • the DM-RS is spread using a time-domain orthogonal spreading sequence of length 4 corresponding to the DM-RS antenna port defined by the LTE system version 10, to transmit on the antenna port.
  • the data transmission unit 81 is configured to: when the method 1 is used, map the DM-RS into the current subframe according to the determined DM-RS mapping resource according to the following method:
  • the first two OFDM symbols including the RE used for transmitting the DM-RS, and the transmission DM-RS corresponding to the same subcarrier number Used 2 The REs are grouped, and the last two are OFDM symbols for transmitting the REs used by the DM-RS, and the two REs used for the transmission DM-RSs corresponding to the same subcarrier number are grouped as one group, and transmitted on each group of REs.
  • the DM-RS performs spreading using a time-domain orthogonal spreading sequence of length 2 corresponding to the DM-RS antenna port defined by the LTE system version 10 to transmit the DM-RS on the antenna port; or
  • the first two OFDM symbols including the RE used for transmitting the DM-RS, and the transmission DM-RS corresponding to the adjacent subcarrier number Two REs are used as one group, and the last two are OFDM symbols for transmitting REs used by DM-RSs, and two REs used for transmitting DM-RSs corresponding to adjacent subcarrier numbers are used as a group.
  • the DM-RS transmitted on the group RE is spread using a time-domain orthogonal spreading sequence of length 2 corresponding to the DM-RS antenna port defined in the LTE system version 10 to transmit the DM- on the antenna port. RS; or,
  • the two REs used for the transmission DM-RS corresponding to the same subcarrier number are grouped as a group, and the DM transmitted on each group of REs is used.
  • -RS is spread using a time domain orthogonal spreading sequence of length 2 corresponding to the DM-RS antenna port defined by the LTE system version 10 to transmit the DM-RS on the antenna port; or
  • the transmission DM-RS on each OFDM including the DM-RS mapping resource is used, and is the most adjacent in the frequency domain.
  • the two REs are grouped as a group, and the DM-RS transmitted on each group of REs is spread using a time-domain orthogonal spreading sequence of length 2 corresponding to the DM-RS antenna port defined in the LTE system version 10, to The DM-RS is transmitted on the antenna port.
  • the data transmission unit 81 is configured to: when the method 2 is used, map the DM-RS into the current subframe according to the determined DM-RS mapping resource according to the following method:
  • the first four OFDM symbols including the RE used for transmitting the DM-RS correspond to the same subcarrier number or adjacent subcarrier number.
  • the four REs used for transmitting the DM-RS are grouped, and the last four OFDM symbols including the RE used for transmitting the DM-RS are used by the transmission DM-RS corresponding to the same subcarrier number or adjacent subcarrier number.
  • the time-domain orthogonal spreading sequence obtained after the transform is: The first two spreading factors of the time domain orthogonal spreading sequence of length 4 defined by version 10 and the time domain orthogonal spreading sequence obtained after the switching positions of the last two spreading factors; or
  • the transformed time-domain orthogonal spreading sequence is: the last spreading factor in the time-domain orthogonal spreading sequence of length 4 defined by the LTE system version 10 as the first spreading factor Factor, the time-domain orthogonal spreading sequence obtained by sequentially shifting the other spreading factors, or the first spreading factor in the time-domain orthogonal spreading sequence of length 4 defined by the LTE system version 10 as the last one Spreading factor, the time-domain orthogonal spreading sequence obtained by sequentially advancing other spreading factors.
  • the data transmission unit 81 is configured to: when the method 2 is used, map the DM-RS into the current subframe according to the determined DM-RS mapping resource according to the following method:
  • the DM-RS transmitted on each group of REs is spread using a time-domain orthogonal spreading sequence of length 2 corresponding to the DM-RS antenna port defined in the LTE system version 10, to transmit on the antenna port.
  • the RE used for transmitting the DM-RS is added to one of the first N OFDM symbols of the current subframe, then on each antenna port where the DM-RS transmission is located in the current subframe,
  • the DM-RS transmitted on the RE used for transmitting the DM-RS on the DM-RS antenna port defined in the LTE system version 10 is spread according to the manner defined in the LTE system version 10 to transmit on the antenna port.
  • the DM-RS uses a time domain orthogonal spreading sequence of length 2 corresponding to the DM-RS antenna port defined by the LTE system version 10; or, the OFDM symbol with the RE used for transmitting the DM-RS is added with LTE
  • the first OFDM symbol defined in the system version 10, which includes the RE used for transmitting the DM-RS, corresponds to the same subcarrier number or 2 REs of adjacent subcarrier numbers as a group, and the DM transmitted on each group of REs
  • the RS uses the DM-RS days defined for LTE system version 10
  • Port 2 is the length corresponding time domain orthogonal spreading sequence obtained after transforming time domain orthogonal spreading sequence is spread, the antenna port to the DM-RS transmitted on the.
  • time-domain orthogonal spreading sequence obtained after the transform is:
  • a time domain orthogonal spreading sequence of length 2 obtained by exchanging positions of two spreading factors in a time domain orthogonal spreading sequence of length 2 defined by the LTE system version 10.
  • the data transmission unit 81 is configured to: OFDM symbols that are DM-RS mapping resources are not adjacent on each DM-RS antenna port in one subframe in a predefined DM-RS resource mapping manner. And when there are at least one group of DM-RS mapping resources consisting of REs corresponding to at least two adjacent subcarrier numbers on the OFDM symbol, the DM- according to the determined DM-RS mapping resource according to the following method
  • the RS is mapped into the current subframe for transmission: For a regular CP, on each antenna port where the DM-RS transmission is located in the current subframe, it will include multiple REs corresponding to the REs used by the DM-RS, and corresponding to the two adjacent subcarrier numbers.
  • the DM-RS transmitted on each group of REs is spread using a time-domain orthogonal spreading sequence of length 4 corresponding to the DM-RS antenna port defined by the LTE system version 10, to be at the antenna port.
  • the DM-RS is transmitted on.
  • the data transmission unit 81 is configured to: OFDM symbols that are DM-RS mapping resources are not adjacent on each DM-RS antenna port in one subframe in a predefined DM-RS resource mapping manner. And when there are at least one group of DM-RS mapping resources consisting of REs corresponding to at least two adjacent subcarrier numbers on the OFDM symbol, the DM- according to the determined DM-RS mapping resource according to the following method The RS is mapped into the current subframe for transmission:
  • the DM-RS transmitted on each group of REs is spread using a time-domain orthogonal spreading sequence of length 2 corresponding to the DM-RS antenna port defined by the LTE system version 10, to be at the antenna port.
  • the DM-RS is transmitted on.
  • the current subframe is a regular downlink subframe or a special subframe configured corresponding to any one of the TDD special subframes. Further, when the current subframe is a normal downlink subframe, N is a positive integer not exceeding 4; and/or, when the current subframe is a special subframe, N is a positive integer not exceeding 2 or not exceeding 3 A positive integer.
  • the beneficial effects of the application include:
  • the mapping resource of the DM-RS exists in the control region of the subframe, that is, the first N OFDM symbols, so that the channel estimation information on the first N OFDM symbols can be transmitted through the N OFDM symbols.
  • the DM-RS is calculated by interpolation, and the DM-RS of the finite column which is far away from the N symbols in the time domain is prevented from being extrapolated, thereby improving the data demodulation performance on the NCT carrier.
  • the TDD special subframe configuration in the LTE Rel-10 that does not support the DM-RS transmission for example, the downlink normal CP
  • the TDD special subframe configuration may be applied in the special subframe.
  • the TDD special subframe configuration 0 and 4 can obtain the DM-RS resource mapping manner corresponding to any TDD special subframe configuration according to the method provided by the present application, so that it is not in Rel-10.
  • the DM-RS can also be transmitted on the special subframe supporting the DM-RS transmission, and the DM-RS-based downlink data transmission can be performed in the special subframe, thereby improving the resource utilization of the NCT carrier.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Abstract

Le mode de réalisation de la présente invention porte sur un procédé et un dispositif de transmission de signal de référence de démodulation (DM-RS) spécifique d'équipement utilisateur (UE) en liaison descendante, qui concernent le domaine des communications sans fil et sont utilisés pour améliorer les performances de démodulation de données sur la porteuse d'un nouveau type de porteuse (NCT). Selon la présente invention, conformément au mode de mappage de ressource DM-RS, un nœud B évolué (eNB) détermine la ressource de mappage DM-RS dans la sous-trame courante, et conformément à la ressource de mappage DM-RS déterminée, l'eNB mappe le DM-RS à la sous-trame courante à transmettre. Conformément au mode de mappage de ressource DM-RS, l'UE détermine la ressource de mappage DM-RS dans la sous-trame courante, et conformément à la ressource de mappage DM-RS déterminée, l'UE obtient le DM-RS transmis dans la sous-trame courante. La ressource de mappage DM-RS comprend au moins un élément de ressource (RE) sur au moins un symbole OFDM des N premiers symboles OFDM dans la sous-trame courante, N étant un entier supérieur ou égal à 1. La présente invention peut améliorer les performances de démodulation de données sur la porteuse d'un nouveau type de porteuse (NCT).
PCT/CN2013/079948 2012-07-24 2013-07-24 Procédé et dispositif de transmission de signal de référence de démodulation spécifique d'équipement utilisateur en liaison descendante WO2014015800A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
CN201210258758.6 2012-07-24
CN201210258758 2012-07-24
CN201310055541.X 2013-02-21
CN201310055541.XA CN103581094B (zh) 2012-07-24 2013-02-21 下行用户专用解调参考信号的传输方法和设备
CN201310057572.9A CN103581095B (zh) 2012-07-24 2013-02-22 下行用户专用解调参考信号的传输方法和设备
CN201310057572.9 2013-02-22

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Cited By (4)

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WO2022027485A1 (fr) * 2020-08-06 2022-02-10 Nec Corporation Procédés de communication, dispositif terminal, dispositif de réseau et supports lisibles par ordinateur

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