WO2012045284A1 - Procédé de transmission de données sur la liaison descendante et dispositif correspondant - Google Patents

Procédé de transmission de données sur la liaison descendante et dispositif correspondant Download PDF

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Publication number
WO2012045284A1
WO2012045284A1 PCT/CN2011/080551 CN2011080551W WO2012045284A1 WO 2012045284 A1 WO2012045284 A1 WO 2012045284A1 CN 2011080551 W CN2011080551 W CN 2011080551W WO 2012045284 A1 WO2012045284 A1 WO 2012045284A1
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Prior art keywords
terminal device
csi
network side
downlink data
transmission scheme
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PCT/CN2011/080551
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English (en)
Chinese (zh)
Inventor
苏昕
高秋彬
拉盖施
肖国军
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电信科学技术研究院
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Publication of WO2012045284A1 publication Critical patent/WO2012045284A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and device for transmitting downlink data. Background technique
  • LTE-A Long Term Evolution Advanced introduces a measurement mechanism based on CSI-RS (Channel State Information Reference Signal), which works in TM (Transfer Mode) 9 UE.
  • CSI-RS Channel State Information Reference Signal
  • TM Transfer Mode 9 UE.
  • CQI Channel Quality Indication
  • PMI Precoding Matrix Indicator
  • RI Rank Indication, etc.
  • CSI-RS patterns shown in Fig. 1 and Fig. 2 are used, as shown in Fig. 1 and Fig. 2, which are schematic diagrams of CSI-RS under normal CP conditions and extended CP conditions, respectively.
  • LTE Long Term Evolution
  • PDSCH Physical Downlink Shared Channel
  • PDSCH can use 7 transmission modes:
  • TM1 Single antenna port (portO) TM2 transmit diversity
  • DMRS Demodulation Reference Signal
  • ⁇ 8 Dual port (port7 & 8) or single port (port7 or 8)
  • TM1 ⁇ 6 it is necessary to use CRS (Common Reference Signal) for measurement and demodulation, and TM7-8 only applies DRS (Dedicated Reference Signal) for data demodulation. .
  • CRS Common Reference Signal
  • DRS Dedicated Reference Signal
  • TM7 uses port 5 and TM8 uses port 7/8.
  • FIG. 3 and FIG. 4 schematic diagrams of UE-specific reference symbol port 5 (normal CP) and UE-specific reference symbol port 7/8 (normal CP), respectively.
  • LTE Rel-8/9 a mechanism based on CRS measurement channel and reporting CQI/PMI/RI is adopted, and in LTE Rel-10, at least one new transmission mode, CSI (Channel State Information), is defined.
  • CSI Channel State Information
  • Embodiments of the present invention provide a downlink data transmission method and device, which are used as a new transmission mode and a corresponding data transmission scheme in an LTE-A system, so that a 1-port CSI-RS can be utilized.
  • an embodiment of the present invention provides a method for transmitting downlink data, including:
  • the terminal device in the single-port transmission mode determines the type of the downlink data transmission scheme according to the content of the downlink control information DCI sent by the network-side device, and receives the type of the downlink data transmission scheme according to the type of the downlink data transmission scheme.
  • Downlink data the terminal device performs channel measurement based on the channel state information reference signal CSI-RS port, and generates channel state information CSI including single codeword channel quality information CQI; if the number of CSI-RS ports is 1, when calculating CQI
  • the reporting module is configured to feed back, to the network side device, a CSI including a single codeword CQI generated by the measurement module.
  • an embodiment of the present invention further provides a method for transmitting downlink data, including:
  • the network side device configures the terminal device as a single port transmission mode by using the high layer signaling; the network side device sends a DCI to the terminal device, indicating the type of the downlink data transmission scheme of the terminal device, and transmitting according to the downlink data.
  • the type of the scheme sends downlink data to the terminal device;
  • the embodiment of the present invention further provides a network side device, including: a sending module, configured to send high layer signaling to the terminal device, configure the terminal device to be a single port transmission mode, and send the DCI to the terminal device. And indicating a type of the downlink data transmission scheme of the terminal device, and sending downlink data to the terminal device according to the type of the downlink data transmission scheme;
  • the receiving module is configured to receive a CSI that includes the single codeword CQI reported by the terminal device. Compared with the prior art, the embodiment of the invention has the following advantages:
  • the terminal device can perform measurement by using the single-port CSI-RS, and on the basis of the foregoing, the single-layer data transmission can be performed.
  • the terminal device Only a single codeword transmission is supported between the device and the network side device, and the DCI format with lower overhead can be used, which is beneficial to support data transmission of the edge terminal device and increase the number of terminal devices that can be supported.
  • FIG. 1 is a schematic diagram of a CSI-RS in a normal CP condition in the prior art
  • FIG. 2 is a schematic diagram of a CSI-RS in an extended CP condition in the prior art
  • FIG. 3 is a UE-specific reference symbol port 5 (normal CP in the prior art) Schematic diagram of
  • FIG. 4 is a schematic diagram of a UE-specific reference symbol port 7/8 (normal CP) in the prior art
  • FIG. 5 is a schematic flowchart of a downlink data transmission method on a terminal device side according to an embodiment of the present invention
  • FIG. 6 is a schematic flowchart of a downlink data transmission method on a network side device according to an embodiment of the present invention
  • FIG. 7 is a schematic structural diagram of a terminal device according to an embodiment of the present invention
  • FIG. 8 is a schematic structural diagram of a network side device according to an embodiment of the present invention.
  • LTE-A In order to achieve a higher transmission rate, a MIMO scheme supporting 8-stream transmission is introduced in LTE-A. At the same time, from the perspective of reducing overhead, LTE-A stripped the measurement and demodulation functions of the reference signal.
  • a mechanism based on CSI-RS for measurement and feedback and demodulation based on DMRS is adopted in LTE-A.
  • the time-frequency density of the CSI-RS is low, and the number of ports is basically determined by the antenna and transmitter configuration of the eNB; the number of ports of the DMRS depends on the number of layers of data transmission, and the time-frequency position and density can ensure data demodulation. Need. According to the current progress of standardization, it has been determined that CSI-RS with 2, 4, and 8 ports respectively is defined in LTE Rd-10, and a new transmission mode based on measurement and feedback of 2, 4, and 8-port CSI-RS is defined. (TM9).
  • embodiments of the present invention propose a new transmission mode and corresponding data transmission scheme, enabling it to utilize a 1-port CSI-RS.
  • FIG. 5 it is a schematic flowchart of a method for transmitting downlink data according to an embodiment of the present invention, where the method specifically includes the following steps:
  • Step S501 The terminal device in the single-port transmission mode determines the type of the downlink data transmission scheme according to the content of the DCI sent by the network-side device, and receives the downlink data sent by the network-side device according to the type of the downlink data transmission scheme.
  • the terminal device receives the processing procedure of the high-level signaling configured by the network-side device to configure the single-port transmission mode, and the network-side device can implement the high-level signaling by using the process. Semi-static configuration of the transmission mode in the terminal device.
  • Case 1 When the content of the DCI is the first identifier, the terminal device determines that the type of the downlink data transmission scheme is a back-off transmission scheme.
  • the back-off transmission scheme is specifically a physical downlink shared channel PDSCH corresponding to the terminal device, and the downlink data transmission is performed by using a transmit diversity mode or a single antenna port mode.
  • Case 2 When the content of the DCI is the second identifier, the terminal device determines the type of the downlink data transmission scheme as the primary transmission scheme.
  • the main transmission scheme is specifically configured to map the data transmitted in the PDSCH corresponding to the terminal device to a demodulation reference signal DMRS port of the terminal device, and the corresponding data stream is mapped to each physical antenna of the network side device.
  • the manner in which the corresponding data stream is mapped to each physical antenna of the network side device depends on the implementation algorithm of the network side device, and the content change of the specific implementation algorithm does not affect the protection scope of the present invention.
  • the second identifier further includes information about the DMRS port of the terminal device and the SCID of the DMRS port.
  • the terminal device when the content of the DCI is the second identifier, and the terminal device is scheduled, the terminal device further uses the information of the DMRS port included in the second identifier, and The SCID information of the DMRS port is used for channel measurement using the DMRS port, and the received downlink data is demodulated.
  • the terminal device receives the high-level signaling including the CSI type information
  • the corresponding processing is specifically divided into the following two cases:
  • Case 1 When the high-level signaling indicates that the terminal device does not perform PMI reporting, the CSI generated by the terminal device includes only the single codeword CQI.
  • Case 2 When there are at least two CSI-RS ports in the network side device, and the high layer signaling indicates that the terminal device performs PMI reporting, the CSI generated by the terminal device includes the PMI and the single code word CQI.
  • Step S503 The terminal device feeds back, to the network side device, a CSI including a single codeword CQI.
  • the processing of this step specifically includes:
  • the terminal device receives the high-level signaling of the configuration reporting mode sent by the network side device; the terminal device feeds back the network-side device with the single codeword CQI according to the reporting mode.
  • the embodiment of the present invention further provides an implementation flow of the downlink data transmission method on the network side device, and the flow diagram thereof is as follows: As shown in Figure 6, the following steps are included:
  • Step S601 The network side device configures the terminal device into a single port transmission mode by using high layer signaling.
  • Step S602 The network side device sends a DCI to the terminal device, indicating a type of the downlink data transmission scheme of the terminal device, and sending the downlink data to the terminal device according to the type of the downlink data transmission scheme.
  • this step is also divided into the following two cases:
  • Case 1 When the content of the DCI is the first identifier, the network side device indicates that the type of the downlink data transmission scheme of the terminal device is a back-off transmission scheme.
  • the back-off transmission scheme specifically uses the transmit diversity mode or the single-antenna port mode for the PDSCH corresponding to the terminal device to perform downlink data transmission.
  • Case 2 When the content of the DCI is the second identifier, the network side device indicates that the type of the downlink data transmission scheme of the terminal device is the primary transmission scheme.
  • the primary transmission scheme is specifically configured to map the data transmitted in the PDSCH corresponding to the terminal device to a DMRS port of the terminal device, and the corresponding data stream is mapped to each physical antenna of the network side device.
  • the manner in which the corresponding data stream is mapped to the physical antennas of the network side device depends on the implementation algorithm of the network side device, and the content change of the specific implementation algorithm does not affect the protection scope of the present invention.
  • the second identifier further includes information about the DMRS port of the terminal device and SCID information of the DMRS port.
  • Step S603 The network side device receives the single codeword CQI reported by the terminal device.
  • the network side device sends the high layer signaling of the configuration reporting mode to the terminal device;
  • the network side device receives the CSI including the single codeword CQI fed back by the terminal device according to the uplink mode.
  • the network side device can also acquire a certain CSI through the SRS.
  • the embodiment of the invention has the following advantages:
  • the terminal device can perform measurement by using the single-port CSI-RS, and on the basis of the foregoing, the single-layer data transmission can be performed.
  • the terminal device Only a single codeword transmission is supported between the device and the network side device, and the DCI format with lower overhead can be used, which is beneficial to support data transmission of the edge terminal device and increase the number of terminal devices that can be supported.
  • the technical solution proposed by the embodiment of the present invention defines a new transmission mode, which is temporarily recorded as TM10 in the subsequent embodiment.
  • this transmission mode also includes two transmission schemes.
  • the first transmission scheme is called a back-off transmission scheme, and is mainly used in a transition phase of transmission mode switching and a situation in which transmission conditions are deteriorated;
  • the second transmission scheme is called a primary transmission scheme, and is used in data transmission in the transmission mode.
  • the main transmission scheme is called a back-off transmission scheme, and is mainly used in a transition phase of transmission mode switching and a situation in which transmission conditions are deteriorated.
  • the two transmission modes are controlled by different DCI formats, and the terminal device can determine the current transmission scheme according to the detection of the PDCCH.
  • the DCI format used in the fallback transmission scheme in TM10 is 1 A, and the DCI format used in the primary transmission scheme is temporarily recorded as 1E.
  • the DCI format content can be changed to other identifiers. It does not affect the scope of protection of the present invention.
  • the network side device performs semi-static configuration on the transmission mode of the terminal device through high layer signaling.
  • the downlink data transmission uses a fallback transmission scheme.
  • PDSCH uses the transmit diversity method specified in Rel-8/9 or single port portO
  • the downlink data transmission uses the primary transmission scheme.
  • the data of the PDSCH is mapped to a terminal-specific reference symbol port, and the data stream is mapped to the physical antennas of the network-side device in some manner.
  • the terminal device side demodulates the data
  • the terminal device-specific reference symbols are used for channel estimation, and data demodulation is performed.
  • the terminal device performs measurement based on the CSI-RS port, and generates a report parameter such as CQI.
  • CQI a report parameter
  • the terminal device performs feedback through PUCCH and PUSCH according to the reporting mode of the high-level configuration.
  • the network side device is configured with more than one CSI-RS port, the technical solution proposed by the embodiment of the present invention may be used.
  • Application scenario 1 The terminal device transmits based on port 7 or 8, and only reports the CQI of a single codeword, and the corresponding description is as follows:
  • the downlink data transmission adopts a back-off transmission scheme.
  • the PDSCH uses the transmit diversity mode specified in Rd-8/9 or the single-ended nport0.
  • the downlink data transmission adopts the primary transmission scheme, specifically, the PDSCH data is mapped to the terminal device-specific reference symbol port 7 or 8, and the data stream is mapped to the network in a certain manner.
  • the mapping mode depends on the implementation algorithm of the network side device, for example, the network side device may measure the uplink channel based on the SRS and select an appropriate mapping manner).
  • the dedicated reference symbol port used by the terminal device and the SCID of the DMRS port are indicated by corresponding control information in the DCI format IE.
  • the terminal device side performs channel estimation using the terminal-specific reference symbol port 7 or 8 according to the port and SCID indicated by the DCI format IE, and performs data demodulation.
  • the terminal device When calculating the CSI for reporting, the terminal device performs measurement based on the CSI-RS port.
  • the reported CSI only includes the CQI reflecting a single codeword.
  • the terminal device reports the CSI through PUCCH and PUSCH according to the reporting mode of the high-level configuration (can only be configured to include the reporting mode without PMI/RI).
  • the network side device can also obtain a certain CSI according to the SRS.
  • Application scenario 2 Based on port 7 or 8 for transmission, report single codeword CQI or report CQI/PMI at the same time. The corresponding description is as follows:
  • the downlink data transmission adopts a back-off transmission scheme.
  • the PDSCH uses the transmit diversity mode specified in Rd-8/9 or the single-ended nport0.
  • the downlink data transmission adopts the primary transmission scheme, and specifically, the PDSCH data is mapped to the terminal device-specific reference symbol port 7 Or 8, and mapping the data stream to each physical antenna of the network side device according to a certain manner (the mapping manner depends on an implementation algorithm of the network side device, for example, the network side device may measure the uplink channel based on the SRS and select an appropriate mapping. the way) .
  • the dedicated reference symbol port used by the terminal device and the SCID of the DMRS port are indicated by corresponding control information in the DCI format IE.
  • the terminal device side performs channel estimation using the terminal-specific reference symbol port 7 or 8 according to the port and SCID indicated by the DCI format IE, and performs data demodulation.
  • the terminal device When calculating the CSI for reporting, the terminal device performs measurement based on the CSI-RS port, and calculates the CSI according to the CSI type configured by the upper layer, which is specifically divided into the following two cases:
  • the CSI only includes the label reflecting the quality information of the single codeword channel, regardless of whether the network side device has several CSI-RS ports.
  • the CSI includes a precoding matrix label (PMI) and a label (CQI) reflecting the channel quality information of the single codeword.
  • PMI precoding matrix label
  • CQI label reflecting the channel quality information of the single codeword.
  • the CQI calculation process assumes that the network side device uses the PMI reported by the terminal device in the PDSCH transmission.
  • the terminal equipment performs feedback through PUCCH and PUSCH according to the reporting mode of the high-level configuration.
  • the network side device can also obtain a certain CSI according to the SRS.
  • Application scenario 3 Based on port 5 for transmission, report single codeword CQI or report CQI/PMI at the same time. The corresponding description is as follows:
  • the downlink data transmission adopts a back-off transmission scheme.
  • the PDSCH uses the transmit diversity mode specified in Rd-8/9 or the single-ended nport0.
  • the downlink data transmission adopts a primary transmission scheme, specifically, the data of the PDSCH is mapped to the terminal device-specific reference symbol port 5, and the data stream is mapped to the network side device in a certain manner.
  • this mapping mode depends on the implementation algorithm of the network side device, for example, the network side device can measure the uplink channel based on the SRS and select an appropriate mapping manner).
  • the terminal device-specific reference symbol port 5 is used for channel estimation, and data demodulation is performed.
  • the terminal device When calculating the CSI for reporting, the terminal device performs measurement based on the CSI-RS port.
  • the reported CSI only includes a label (CQI) reflecting the channel quality information of a single codeword.
  • the terminal device reports the CSI through PUCCH and PUSCH according to the reporting mode of the high-level configuration (can only be configured to include the reporting mode without PMI/RI).
  • the network side device can also obtain a certain CSI according to the SRS.
  • Application scenario 4 Based on port 5 for transmission, report single codeword CQI or report CQI/PMI at the same time. The corresponding description is as follows:
  • the downlink data transmission adopts a back-off transmission scheme.
  • the PDSCH uses the transmit diversity mode specified in Rd-8/9 or the single-ended nport0.
  • the downlink data transmission adopts a primary transmission scheme, specifically, the data of the PDSCH is mapped to the terminal device-specific reference symbol port 5, and the data stream is mapped to the network side device in a certain manner.
  • this mapping mode depends on the implementation algorithm of the network side device, for example, the network side device can measure the uplink channel based on the SRS and select an appropriate mapping manner). 2
  • the terminal device-specific reference symbol port 5 is used for channel estimation, and data demodulation is performed.
  • the terminal device When calculating the CSI for reporting, the terminal device performs measurement based on the CSI-RS port, and calculates the CSI according to the CSI type configured by the upper layer, which is specifically divided into the following two cases:
  • the CSI only includes the label reflecting the quality information of the single codeword channel, regardless of whether the network side device has several CSI-RS ports.
  • the CSI includes a precoding matrix label (PMI) and a label (CQI) reflecting the channel quality information of the single codeword.
  • PMI precoding matrix label
  • CQI label reflecting the channel quality information of the single codeword.
  • the terminal equipment performs feedback through PUCCH and PUSCH according to the reporting mode of the high-level configuration.
  • the network side device can also obtain a certain CSI according to the SRS.
  • the embodiment of the invention has the following advantages:
  • the terminal device can perform measurement by using the single-port CSI-RS, and on the basis of the foregoing, the single-layer data transmission can be performed.
  • the terminal device Only a single codeword transmission is supported between the device and the network side device, and the DCI format with lower overhead can be used, which is beneficial to support data transmission of the edge terminal device and increase the number of terminal devices that can be supported.
  • the embodiment of the present invention further provides a terminal device, and a schematic structural diagram thereof is shown in FIG. 7, which specifically includes:
  • the receiving module 71 is configured to receive the DCI, the high layer indication, and the downlink data sent by the network side. In a specific application scenario, the receiving module 71 is further configured to:
  • the determining module 72 is configured to determine the type of the downlink data transmission scheme according to the content of the DCI sent by the network side device received by the receiving module 71, and enable the receiving module 71 to receive the downlink data sent by the network side device according to the type of the downlink data transmission scheme. .
  • the determining module 72 is specifically configured to:
  • the PDSCH corresponding to the terminal device uses a transmit diversity mode or a single antenna. Port mode for downlink data transmission;
  • the type of the downlink data transmission scheme is determined to be a primary transmission scheme, and the primary transmission scheme is specifically mapped to the terminal device by the data transmitted in the PDSCH corresponding to the terminal device.
  • a DMRS port the corresponding data stream is mapped to each physical antenna of the network side device;
  • the second identifier When the content of the DCI received by the receiving module 71 is the second identifier, the second identifier further includes information about the DMRS port of the terminal device and SCID information of the DMRS port.
  • the measuring module 73 is further configured to: according to the DMRS included in the second identifier.
  • the information of the port and the SCID information of the DMRS port are used for channel measurement using the DMRS port, and the downlink data received by the receiving module 71 is demodulated.
  • the measuring module 73 is specifically configured to:
  • the reporting module 74 is configured to feed back, to the network side device, the CSI including the single codeword CQI generated by the measurement module 73.
  • the reporting module 74 is specifically configured to feed back, to the network side device, the CSI including the single codeword CQI generated by the measurement module 73 according to the reporting mode configured by the high layer signaling received by the receiving module 71.
  • the embodiment of the present invention further provides a network side device, and a schematic structural diagram thereof is shown in FIG.
  • the sending module 81 is configured to send the high-level signaling to the terminal device, configure the terminal device to be in the single-port transmission mode, and send the DCI to the terminal device, indicating the type of the downlink data transmission scheme of the terminal device, and according to the type of the downlink data transmission scheme.
  • the terminal device transmits downlink data.
  • the sending module 81 is specifically configured to:
  • the type of the downlink data transmission scheme of the terminal device is a back-off transmission scheme, and the back-off transmission scheme is specifically used by the PDSCH corresponding to the terminal device.
  • the type of the downlink data transmission scheme of the terminal device is indicated as the primary transmission scheme, and the primary transmission scheme is specifically mapped to the data transmitted in the PDSCH corresponding to the terminal device.
  • a DMRS port of the terminal device, and corresponding data streams are mapped to physical antennas of the network side device;
  • the second identifier further includes the information of the DMRS port of the terminal device and the SCID of the DMRS port.
  • the sending module 81 is further configured to: High-level signaling for configuring a single-port transmission mode sent to the terminal device, and/or including
  • High-level signaling of CSI type information, and/or high-level signaling of configuration reporting mode are examples of high-level signaling of CSI type information, and/or high-level signaling of configuration reporting mode.
  • the receiving module 82 is configured to receive a CSI that includes a single codeword CQI reported by the terminal device.
  • the receiving module 82 is specifically configured to:
  • the receiving terminal device feeds back CSI including a single codeword CQI according to the reporting mode configured by the transmitting module 81.
  • the receiving module 82 is further configured to receive a certain CSI through the SRS.
  • the embodiment of the invention has the following advantages:
  • the terminal device can perform measurement by using the single-port CSI-RS, and on the basis of the foregoing, the single-layer data transmission can be performed.
  • the terminal device Only a single codeword transmission is supported between the device and the network side device, and the DCI format with lower overhead can be used, which is beneficial to support data transmission of the edge terminal device and increase the number of terminal devices that can be supported.
  • a form of software product is embodied, the computer software product being stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the present invention.
  • a computer device which may be a personal computer, a server, or a network device, etc.
  • modules in the apparatus in the embodiments may be distributed in the apparatus of the embodiment according to the description of the embodiments, or may be correspondingly changed in one or more apparatuses different from the embodiment.
  • the modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.

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Abstract

La présente invention se rapporte à un procédé de transmission de données sur la liaison descendante. L'invention se rapporte d'autre part à un dispositif correspondant. La solution technique de la présente invention permet à un dispositif formant terminal d'utiliser un port CSI-RS unique pour effectuer des mesures, et pour transmettre des données de couche unique sur la base de la mesure. La solution technique de la présente invention est caractérisée en ce que seule une transmission à code unique est prise en charge entre un dispositif formant terminal et un dispositif de réseau. Dans ces conditions, le format CDI à moindre coût peut être adopté. Il s'ensuit que la transmission de données de dispositifs formant terminaux au niveau du bord est prise en charge et que le nombre de dispositifs formant terminaux supporté peut être augmenté.
PCT/CN2011/080551 2010-10-09 2011-10-08 Procédé de transmission de données sur la liaison descendante et dispositif correspondant WO2012045284A1 (fr)

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CN110311764B (zh) * 2018-03-27 2023-04-07 维沃移动通信有限公司 用于传输解调参考信号的方法、终端设备和网络侧设备
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