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WO2015007152A1 - Procédé et appareil pour indiquer un motif dm-rs - Google Patents

Procédé et appareil pour indiquer un motif dm-rs Download PDF

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Publication number
WO2015007152A1
WO2015007152A1 PCT/CN2014/081057 CN2014081057W WO2015007152A1 WO 2015007152 A1 WO2015007152 A1 WO 2015007152A1 CN 2014081057 W CN2014081057 W CN 2014081057W WO 2015007152 A1 WO2015007152 A1 WO 2015007152A1
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WO
WIPO (PCT)
Prior art keywords
pattern
value
specific field
mcs
density
Prior art date
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Application number
PCT/CN2014/081057
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English (en)
Chinese (zh)
Inventor
张兴炜
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0025—Transmission of mode-switching indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1896—ARQ related signaling

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a DM-RS pattern indication method and apparatus. Background technique
  • LTE-A Long Term Evolution-Advanced
  • LTE-A Rel-10/11/12 Long Term Evolution (LTE) Rel-8/
  • CA Carrier Aggregation
  • MIMO Multi-Input Multiple-Output
  • the hotspot area includes indoor and outdoor scenes, and a plurality of low-power micro base stations (Pico eNBs) cover a plurality of small cells (Small Cell Network, SCN).
  • the indoor Pico eNB only supports low-speed mobile user equipment (User Equipment, UE for short).
  • the outdoor Pico eNB supports medium-speed mobile UEs in addition to low-speed mobile UEs. Both Pico eNBs do not support high-speed mobile. UE.
  • the moving speed is called low-speed movement between 0km/h-15km/h, the moving speed is between 15km/h-60km/h, which is called medium-speed movement, and the moving speed is above 60km/h, which is called high-speed movement.
  • the micro base station since the micro base station only serves the medium and low speed mobile UE, the radio channel quality between the micro base station and the UE is relatively good, the coverage is relatively small, and the number of serving UEs is relatively small, so the pilot can be reduced. And the overhead of control signaling.
  • a resource block is composed of a plurality of resource elements (REs).
  • REs resource elements
  • the DM-RS pattern refers to a graphical representation of the number and location of REs used to transmit DM-RSs in RBs.
  • there may be multiple DM-RS patterns and these DM-RS patterns are respectively stored in the eNB and the UE, and the UE uses the same DM as the eNB.
  • - RS pattern to demodulate data transmitted by the eNB.
  • the reduction of pilot and control signaling overhead can be achieved by reducing the Demodulation Reference Signal (DM-RS). Specifically, more sparse time domain or/and frequency domain DM-RS patterns can be used. To achieve the purpose of reducing the pilot overhead; at the same time, in order to be compatible with the existing DM-RS pattern, different DM-RS patterns are needed; thus, the eNB needs to inform the UE which DM-RS pattern the eNB uses, so that The UE can determine the DM-RS pattern that the UE should use according to the DM-RS pattern used by the eNB.
  • DM-RS Demodulation Reference Signal
  • the manner in which the eNB notifies the UE to use the DM-RS pattern includes: adding a new field by using Downlink Control Information (DCI) signaling at the physical layer to indicate the DM-RS pattern; In this way, a new field needs to be added, so the physical downlink control channel (PDCCH) has a relatively large overhead.
  • DCI Downlink Control Information
  • the present invention provides a DM-RS pattern indication method and apparatus to achieve the purpose of saving downlink control channel overhead.
  • This application is implemented as follows:
  • an embodiment of the present invention provides a demodulation reference signal DM-RS pattern indication method, including: acquiring a specific field in a downlink control information DCI; the specific field includes a downlink channel quality Quantity related fields, or fields with redundant status;
  • a corresponding DM-RS pattern for use on the UE is determined based on the particular field.
  • the specific field includes: one or any combination of a modulation coding scheme MCS, a new data indication NDI, or a redundancy version RV.
  • determining, according to the specific field, the corresponding DM-RS pattern used on the UE including:
  • determining, according to the specific field, the corresponding DM-RS pattern used on the UE including:
  • a DM-RS pattern having a density not less than the original DM-RS pattern density is used for the retransmitted data
  • a DM-RS pattern having a lower density than the original DM-RS pattern is used for the newly transmitted data.
  • the determining, according to the specific field, the corresponding DM-RS pattern used on the UE includes:
  • the determining, according to the specific field, the corresponding DM-RS pattern used on the UE includes: according to the MCS Determining the density of the corresponding DM-RS pattern of the MCS by mapping the value to the DM-RS pattern density;
  • the DM-RS pattern corresponding to the RV is determined in the DM-RS pattern of the determined density by the mapping relationship between the value of the RV and the DM-RS pattern.
  • the DM-RS pattern corresponding to the RV is determined in the DM-RS pattern of the determined density by the mapping relationship between the value of the RV and the DM-RS pattern.
  • the method when the specific field includes the MCS and the RV, the method further includes:
  • the number of subsequent subframes using the same DM-RS pattern is determined based on the value of the RV.
  • the method when the specific field includes the NDI and the RV, the method further includes:
  • the number of subsequent subframes using the same DM-RS pattern is determined based on the value of the RV.
  • the determining, according to the value of the RV, the number of subsequent subframes that use the same DM-RS pattern includes:
  • an embodiment of the present invention provides a DM-RS pattern indicating apparatus, including: a specific field obtaining module, configured to acquire a specific field in a downlink control information DCI; the specific field includes a field related to a downlink channel quality , or, a field with redundant status;
  • a pattern determining module configured to determine, according to the specific field, a corresponding DM-RS pattern used on the UE.
  • the specific field includes: one or any combination of a modulation coding scheme MCS, a downlink allocation index NDI, or a redundancy version RV.
  • the pattern determining module is configured to:
  • the pattern determining module is configured to:
  • the density used for retransmitting data is not less than the original DM-RS map.
  • a DM-RS pattern having a lower density than the original DM-RS pattern is used for the newly transmitted data.
  • the pattern determining module is configured to:
  • the pattern determining module includes:
  • a pattern density determining unit configured to determine a density of a corresponding DM-RS pattern of the MCS according to a mapping relationship between the MCS value and a DM-RS pattern density
  • a pattern identifying unit configured to determine, according to the mapping relationship between the value of the RV and the DM-RS pattern, the DM-RS pattern corresponding to the RV in the determined density DM-RS pattern.
  • the pattern determining module includes:
  • a pattern density determining unit configured to determine a density of the corresponding DM-RS pattern according to the value of the NDI
  • a pattern identifying unit configured to determine, according to the mapping relationship between the value of the RV and the DM-RS pattern, the DM-RS pattern corresponding to the RV in the determined density DM-RS pattern.
  • the method when the specific field includes the MCS and the RV, the method further includes a subsequent subframe number determining module;
  • the subsequent subframe number determining module is further included;
  • the number of subsequent subframes is a value of the RV, or a product of the value of the RV and a preset value.
  • FIG. 1 is a schematic diagram of a DM-RS pattern described in the present application.
  • FIG. 2 is a schematic flowchart of a method for indicating a DM-RS pattern according to the present application
  • FIG. 3 is another schematic diagram of a DM-RS pattern according to the present application
  • FIG. 5 is still another schematic diagram of the DM-RS pattern described in the present application
  • FIG. 6 is another schematic diagram of the DM-RS pattern described in the present application
  • FIG. 7 is a schematic structural diagram of a DM-RS pattern indicating device according to the present application.
  • FIG. 8 is still another schematic structural diagram of the DM-RS pattern indicating device according to the present application.
  • FIG. 9 is still another schematic structural diagram of the DM-RS pattern indicating device according to the present application.
  • FIG. 10 is a schematic structural diagram of a user equipment in the present application.
  • the present invention provides a DM-RS pattern indication method. As shown in FIG. 2, the method includes the following steps:
  • a specific field in the existing DCI is utilized.
  • the specific fields in this application refer to fields related to the quality of the downlink channel, or fields with a redundant state.
  • the density of the DM-RS used by the eNB is related to the quality of the downlink channel.
  • BLER target block error rate
  • the lower density DM-RS can be used when the downlink channel quality is good.
  • the value of some fields is also related to the downlink channel quality.
  • the eNB is different according to the principle.
  • the downlink channel quality is selected by a different Modulation and Coding Scheme (MCS). This is because, in LTE, the downlink channel quality is obtained by feedback measurement of the UE, and the channel quality indicator is indicated by the UE.
  • MCS Modulation and Coding Scheme
  • the 4-bit CQI corresponds to different Signal-to-Interference and Noise Ratio (SINR).
  • SINR Signal-to-Interference and Noise Ratio
  • the eNB selects an appropriate MCS for the downlink according to the CQI. Specifically, the better the channel quality eNB can use the higher order modulation mode and the higher the MCS corresponding to the code rate, the worse
  • the eNB may use different time domain or/and frequency domain sparsity DM-RS patterns according to the channel quality; specifically, the better the channel quality, the time domain or/and frequency can be used.
  • the DM-RS pattern with larger domain sparsity that is, the DM-RS pattern with smaller RS density, thereby reducing the resource occupancy of the Demodulation Reference Signal (DM-RS) in the subframe;
  • DM-RS Demodulation Reference Signal
  • the eNB selects an appropriate DM-RS pattern and has a certain correlation with the channel quality.
  • the UE can also obtain some downlink channel quality related information by acquiring the downlink control channel DCI related to the downlink channel quality. Information, therefore, can be used to determine the DM-RS pattern indicated by the eNB.
  • the field including the redundant state refers to a certain state in the DCI, including a state that is not used, so that by utilizing the state that is not used in these fields, the UE can be added to the UE without additionally adding a dedicated field. Indicates the DM-RS pattern.
  • the fields including the redundancy status may be, but are not limited to, the various fields mentioned herein, as long as they are in the DCI and include redundant states.
  • the most commonly used downlink channel quality related fields in a specific field may include MCS and NDI, specifically:
  • the eNB Since the eNB selects an appropriate MCS after receiving the reported CQI information of the UE, and the eNB selects an appropriate DM-RS pattern according to the quality of the channel, it can be concluded that the eNB
  • the selected DM-RS pattern selected by the MCS and the eNB is associated with the channel quality; that is, after obtaining the MCS selected by the eNB, the RS density of the DM-RS pattern selected by the eNB can be derived.
  • both the eNB and the UE store multiple DM-RS patterns, and each DM-RS pattern has a mapping relationship with a MCS value range.
  • the eNB will be at
  • the DL grant of the PDCCH/EPDCCH carries an MCS field, which is used to indicate the MCS used by the PDSCH.
  • the DL grant in the PDCCH/EPDCCH received by the UE may be mapped from the MCS to the corresponding DM-RS pattern, and the DM-RS pattern is used for the PDSCH. For example, when the MCS is at 0 to 9, corresponding to the DM-RS pattern in FIG. 3, when the MCS is at 10 to 16, corresponding to the DM-RS pattern in FIG. 4, when the MCS is at 17 to 31, corresponding to FIG. DM-RS pattern.
  • the eNB selects the MCS according to the received CQI information of the UE from 0 to 9; meanwhile, according to the current channel quality, the eNB should select the DM-RS pattern as shown in FIG.
  • the sparse time domain or / and frequency domain DM-RS patterns are used as much as possible to reduce the pilot overhead.
  • the UE learns that the MCS selected by the eNB is 10 to 16, so that The mapping relationship infers the RS density of the DM-RS pattern selected by the eNB.
  • each RS density corresponds to only one DM-RS pattern, it is concluded that the RS density of the DM-RS pattern can be inferred that the DM-RS pattern is The DM-RS pattern shown in Figure 4.
  • the UE after the UE obtains the field of the NDI information in the DCI, it may be determined whether the channel quality is deteriorated by the value of the NDI, and further whether the eNB selects a denser DM-RS pattern. Specifically, when the value of the NDI is 0, it indicates that the NDI indicates retransmission, indicating that the channel quality is degraded, and thus it can be inferred that the eNB does not select a smaller density for retransmitting data.
  • DM-RS pattern at this time, according to the preset convention, it is necessary to use a DM-RS pattern with a density not less than the original DM-RS pattern density.
  • NDI when the value of NDI is 0, it indicates that the NDI indicates a new transmission, indicating that the channel quality is good.
  • the original DM-RS map can be used.
  • the field including the redundant state is most typically an RV field, that is, the corresponding DM-RS pattern can be indicated by the value in the RV field.
  • the mapping relationship between the RV value and the DM-RS pattern may be preset, so that the corresponding DM-RS pattern may be determined according to the value of the RV field.
  • the UE passes the field related to the downlink channel quality in the DCI, or has a redundant
  • the field is used to infer the DM-RS pattern selected by the eNB, so that there is no need to additionally add a new field to indicate the DM-RS pattern as in the prior art, thus reducing the overhead of pilot and control signaling.
  • the field RV can also be used in conjunction with the field MCS or the field NDf.
  • the multiple DM-RS patterns may be identified by different values of the field RV. So that the UE can further determine the required DM-RS pattern.
  • the field RV is used in combination with the MCS, and the UE may determine the required DM-RS pattern according to the MCS field, and then obtain the number of subframes that can be used by the DM-RS pattern through the value of the field RV.
  • the UE obtains the MCS information field in the DCI, it knows that the MCS selected by the eNB is between 10 and 16, so that the required DM-RS pattern is the DM-RS pattern as shown in FIG.
  • the value of the RV is used to determine the number of subframes in which the DM-RS pattern shown in FIG. 4 can be used later.
  • the specific number of subsequent subframes may be the value of the RV itself.
  • the DM-RS pattern Only valid for this frame when the value of RV is equal to 1, the number of subsequent subframes may be lk; when the value of RV is equal to 2, the number of subsequent subframes may be 2k; in addition, the value of the RV may be multiplied by
  • the preset value for example, when the value of RV is equal to 1, the number of subsequent subframes may be lk. When the value of RV is equal to 2, the number of subsequent subframes may be 2k, that is, the preset value may be set to lk; The determination of the preset value can be determined according to the needs of the actual application, and no specific numerical limitation is made here.
  • the number of subframes in which the same DM-RS pattern can be subsequently used is determined by the RV value, so that the same DM-RS pattern can be used in a certain subframe, thereby avoiding frequent DM-RS patterns.
  • the joint use of the field RV and the NDI may specifically be: when the UE determines the required DM-RS pattern according to the NDI field, when the corresponding same RS density includes multiple DM-RS patterns, the different values of the field RV may be adopted.
  • the plurality of DM-RS patterns are identified to enable the UE to accurately determine the required DM-RS pattern.
  • the joint use of the field RV and the NDI may specifically be: the UE determines the required DM-RS pattern according to the NDI field, and then obtains the number of subframes that can be used by the DM-RS pattern by using the value of the field RV;
  • the role and application principle of RV is similar to the joint use of RV and MCS. The purpose is to use the same DM-RS pattern in a certain sub-frame, thus avoiding the frequent conversion of DM-RS patterns.
  • the present invention provides a DM-RS pattern indicating device 10, as shown in Fig. 7, the DM-RS pattern indicating device 10 includes:
  • a specific field obtaining module 01 configured to acquire a specific field in the DCI;
  • the specific field includes a field related to the quality of the downlink channel, or a field having a redundant state;
  • the pattern determining module 02 is configured to determine a corresponding DM-RS pattern used on the UE according to a specific field.
  • the specific fields in this application refer to fields related to the quality of the downlink channel, or fields with a redundant state.
  • the DM-RS pattern indicating device 10 in the present application may be disposed in the UE. In this way, after the eNB sends the DCI to the UE, the specific field obtaining module 01 can acquire the specific field according to the DCI received by the UE.
  • the field related to the downlink channel quality in the present application may specifically be MCS or NDI; for example, the better the channel quality, the higher order modulation mode and the higher the code rate corresponding to the MCS, and the NDI may also be used.
  • MCS MCS
  • NDI NDI
  • the meaning is that the retransmitted data is sent, which means that it has been sent once, but the UE has not received or is not correct.
  • Receiving, indicating that the channel condition is not good at this time; when NDI 1, according to the original NDI indication information, the meaning refers to the initial data transmitted, indicating that the channel quality has not deteriorated.
  • the specific field includes the field MCS.
  • both the eNB and the UE store multiple DM-RS patterns; since the eNB selects a suitable channel according to the quality of the channel.
  • the MCS is used for the downlink, and the eNB also instructs the UE to determine the corresponding DM-RS pattern according to the quality of the channel.
  • each DM-RS pattern and one MCS are set in this application.
  • the value range has a mapping relationship; for example, when the MCS is 0 to 9, corresponding to the DM-RS pattern in FIG. 3, when the MCS is 10 to 16, corresponding to the DM-RS pattern in FIG. 4, when the MCS is in the MCS From 17 to 31, it corresponds to the DM-RS pattern in Figure 5.
  • the pattern determining module 02 can determine the corresponding DM-RS pattern used on the UE according to the mapping relationship. For example, when the MCS field obtained by the specific field obtaining module 01 has a value of 5, the pattern determining module 02 can infer that the eNB should select the DM-RS pattern as shown in FIG. 3 according to the above mapping relationship. It is also possible to determine the DM-RS pattern as shown in FIG. 3 that the UE should also use. By analogy, when the field MCS obtained by the specific field obtaining module 01 has a value of 12, the pattern determining module 02 can determine that the corresponding DM-RS pattern used on the UE is the DM-RS pattern as shown in FIG.
  • the corresponding DM-RS pattern is determined according to the field NDI, and the specific determining scheme is:
  • the pattern determining module 02 can determine that the DM-RS having a density not less than the original DM-RS pattern density is used for the retransmitted data.
  • the data can be re-transmitted according to the preset convention as shown in FIG. 4
  • the field NDI obtained by the specific field obtaining module 01 When the field NDI obtained by the specific field obtaining module 01 is 1, that is, when the NDI indicates a new transmission, a DM-RS pattern having a smaller density than the original DM-RS pattern is used for the newly transmitted data.
  • the DM-RS pattern shown in FIG. 5 may be used for the newly transmitted data.
  • the principle of the scheme is that when the value of the NDI is 0, it indicates that the NDI indicates retransmission, indicating that the channel quality is degraded, and thus it can be inferred that the eNB does not select a DM-RS pattern with a smaller density for retransmitting data.
  • a DM-RS pattern with a density not less than the original DM-RS pattern density it is necessary to use a DM-RS pattern with a density not less than the original DM-RS pattern density.
  • the value of NDI is 1, it indicates that the NDI indicates a new transmission, indicating that the channel quality is good.
  • a DM-RS pattern having a smaller density than the original DM-RS pattern can be used. The overhead of the downlink control channel is saved.
  • the field including the redundant state means that in some fields, the state that is not used is included, so that by using the state that is not used in these fields, the DM can be indicated to the UE without additionally adding a dedicated field.
  • RS pattern
  • the fields including the redundancy status may be, but are not limited to, the various fields mentioned herein, as long as they are in the DCI and include redundant states.
  • the field including the redundant state is most typically an RV field, that is, the corresponding DM-RS pattern can be indicated by the value in the RV field.
  • the mapping relationship between the value of the RV and the DM-RS pattern may be preset, so that the pattern determining module 02 can be based on the specific word.
  • the value of the RV field acquired by the segment acquisition module 01 is used to determine the corresponding DM-RS pattern used on the UE.
  • the DM-RS pattern indicating device is related to the downlink channel quality in the DCI, or includes redundancy.
  • the field of the state is used to infer the DM-RS pattern selected by the eNB, so that there is no need to additionally add a new field to indicate the DM-RS pattern as in the prior art, so the pilot and control signaling are further reduced. s expenses.
  • the pattern determining module 02 may further include a pattern density determining unit 021 and a pattern identifying unit 022; specifically:
  • the pattern density determining unit 021 is configured to determine a density of the corresponding DM-RS pattern of the MCS according to a mapping relationship between the MCS value and the DM-RS pattern density;
  • the pattern identifying unit 022 is configured to determine a corresponding DM-RS pattern of the RV by using a mapping relationship between the value of the RV and the DM-RS pattern.
  • the different values of the field RV may be used to determine the plurality of DM-RS patterns.
  • the UE can accurately determine the required DM-RS pattern.
  • the DM-RS pattern shown in Figure 5 has the same density as the DM-RS pattern shown in Figure 4.
  • the pattern density determining unit 021 can determine the density of the corresponding DM-RS pattern of the MCS according to the mapping relationship between the MCS value and the DM-RS pattern density, and determine the density of the DM-RS pattern including FIG. 5.
  • Figure 2 two DM-RS patterns as an example; since two DM-RS patterns are included in the density, it is still impossible to accurately determine which DM-RS pattern the DM-RS pattern used on the UE should be. For this, further confirmation by the pattern identification unit 022 is required.
  • the pattern determining module 02 includes a pattern density determining unit 021 and a pattern identifying unit 022, and may further include another embodiment;
  • the pattern density determining unit 021 determines the density of the corresponding DM-RS pattern according to the value of the NDI;
  • the pattern identifying unit 022 determines the DM-RS pattern corresponding to the RV by using the mapping relationship between the value of the RV and the DM-RS pattern.
  • the present embodiment is similar to the principle of the previous embodiment.
  • the pattern density determining unit 021 determines the density of the corresponding DM-RS pattern according to the value of the NDI
  • the identification unit 022 specifically determines which DM-RS pattern should be from the plurality of DM-RS patterns according to the value of the RV.
  • FIG. 9 is a DM-RS pattern indicating apparatus 11 according to another embodiment of the present invention.
  • the DM-RS pattern indicating apparatus 22 includes: a specific field obtaining module 01, a pattern determining module 02, and a subsequent subframe number determining module 03;
  • the specific field obtaining module 01 and the pattern determining module 02 have the same functions as the corresponding embodiments of FIG. 7 and FIG. 8.
  • the fixed field obtaining module 01 and the pattern determining module 02 are not described in detail in this embodiment.
  • the specific field acquisition module 01 acquires the field MCS, and the pattern determination module 02 determines the corresponding DM-RS pattern used on the UE according to the value of the MCS.
  • the subsequent subframe number determining module 03 obtains the number of subframes that can use the DM-RS pattern later by using the value of the field RV; for example, when the specific field obtaining module 01 in the UE obtains the field of the MCS information in the DCI, It is known that the MCS selected by the eNB is 10 to 16, thereby determining that the DM-RS pattern used on the UE should be the DM-RS pattern shown in FIG. 4, and further, the subsequent subframe number determining module 03 is based on the field RV. The value is used to determine the number of subframes in which the DM-RS pattern shown in FIG. 4 can be used later; the specific number of subsequent subframes may be the value of the RV itself.
  • the DM-RS pattern is only for the present version.
  • the frame is valid; when the value of RV is equal to 1, the number of subsequent subframes can be lk; When the value of RV is equal to 2, the number of subsequent subframes may be 2k.
  • the value of the RV may be multiplied by a preset value. For example, when the value of RV is equal to 1, the number of subsequent subframes may be lk. When the value of the RV is equal to 2, the number of subsequent subframes may be 2k, that is, the preset value may be set to lk; the determination of the preset value may be determined according to the needs of the actual application, and no specific numerical limitation is used herein.
  • the number of subframes in which the same DM-RS pattern can be subsequently used is determined by the RV value, so that the same DM-RS pattern can be used in a certain subframe, thereby avoiding frequent DM-RS patterns.
  • the specific field obtained by the specific field obtaining module 01 is NDI
  • the specific field obtaining module 01 obtains the field NDI
  • the pattern determining module 02 determines the corresponding DM-RS pattern used on the UE according to the value of the NDI.
  • the subsequent subframe number determining module 03 obtains the number of subframes that can subsequently use the DM-RS pattern by using the value of the field RV;
  • RV role and application principle of RV is similar to the combination of RV and MCS.
  • the purpose is to use the same DM-RS pattern in a certain sub-frame, thus avoiding the frequent conversion of DM-RS patterns.
  • the embodiment of the present invention further provides a user equipment 20, which is used to implement parsing of the DM-RS pattern indication of the eNB.
  • the user equipment 20 includes:
  • the receiver 2101 obtains a specific field in the downlink control information DCI; the specific field includes a field related to the quality of the downlink channel, or a field with a redundant state;
  • the receiver 2101 can acquire a specific field according to the DCI received by the UE. Since the user equipment also includes specific fields and The mapping relationship of the DM-RS patterns, therefore, the memory 2103 can determine the corresponding DM-RS pattern used on the UE according to the mapping relationship.
  • the field related to the downlink channel quality in this application may specifically be MCS or NDI; the field including the redundancy status may be an RV field.
  • the processor 2102 may be further configured to determine, according to the mapping relationship between the MCS value and the DM-RS pattern density, the density of the corresponding DM-RS pattern of the MCS; And determining, by using the mapping relationship between the value of the RV and the DM-RS pattern, the DM-RS pattern corresponding to the RV.
  • the processor 2102 is further configured to determine a density of the corresponding DM-RS pattern according to the value of the NDI; and then, by using the value of the RV and the DM- The mapping relationship of the RS patterns determines the corresponding DM-RS pattern of the RV.
  • the field in the DCI related to the downlink channel quality or including the redundant state is inferred.
  • the DM-RS pattern selected by the eNB is outdated, so that it is not necessary to additionally add a new field to indicate the DM-RS pattern as in the prior art, so the overhead of pilot and control signaling is further reduced.
  • the processor 2102 is further configured to obtain, according to the value of the field RV, the number of subframes that can be subsequently used by the DM-RS pattern.
  • the RV value is used to determine that the frame can be used subsequently.
  • the number of subframes of the same DM-RS pattern so that the same DM-RS pattern can be used in a certain subframe, thereby avoiding frequent conversion of the DM-RS pattern.
  • the disclosed systems, devices, and methods may be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the modules or units is only a logical function division.
  • there may be another division manner for example, multiple units or components may be used. Combined or can be integrated into another system, or some features can be ignored, or not executed.
  • the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise.
  • the components displayed as units may or may not be physical units, i.e., may be located in one place, or may be distributed over multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the instructions include a plurality of instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .
  • the method for switching user equipment provided by the embodiment of the present invention and including the source network design
  • the apparatus, the user equipment, and the target wireless network control node are described in detail, but the description of the above embodiments is only for helping to understand the method of the present invention and its core idea, and should not be construed as limiting the present invention.
  • Those skilled in the art will be able to devise variations or substitutions within the scope of the present invention within the scope of the present invention.

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

Abstract

La présente invention porte sur un procédé et un appareil pour indiquer un motif de signal de référence de démodulation (DM-RS). Le procédé consiste à: obtenir un champ spécifique dans des informations de commande de liaison descendante (DCI); et déterminer le motif DM-RS correspondant en fonction du champ spécifique. Dans le processus de réduction du coût de pilotes et de signalisation de commande par réduction de signaux de référence, selon la présente invention, l'UE déduit le motif DM-RS sélectionné par l'eNB en fonction du champ concernant la qualité de canal de liaison descendante dans des DCI, ou du champ avec redondance. Ainsi, contrairement à l'état antérieur de la technique, il n'est pas nécessaire que de nouveaux champs supplémentaires soient ajoutés par l'eNB pour indiquer le motif DM-RS utilisé sur l'UE, et en conséquence le coût des pilotes et de la signalisation de commande est réduit.
PCT/CN2014/081057 2013-07-19 2014-06-28 Procédé et appareil pour indiquer un motif dm-rs Ceased WO2015007152A1 (fr)

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CN201310306798.8A CN104301067B (zh) 2013-07-19 2013-07-19 Dm-rs图样指示方法和装置

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