WO2012045284A1

WO2012045284A1 - Downlink data transmission method and device therefor

Info

Publication number: WO2012045284A1
Application number: PCT/CN2011/080551
Authority: WO
Inventors: 苏昕; 高秋彬; 拉盖施; 肖国军
Original assignee: 电信科学技术研究院
Priority date: 2010-10-09
Filing date: 2011-10-08
Publication date: 2012-04-12
Also published as: CN102448105B; CN102448105A

Abstract

Disclosed are a downlink data transmission method and a device therefor. The solution of the present invention enables a terminal device to use a single port CSI-RS to take a measurement and, on the basis of the measurement, to transmit single layer data. In the solution as put forth in embodiments of in the present invention, only single code transmission is supported between a terminal device and a network device, allowing for a low-cost CDI format, which is beneficial for supporting data transmission of terminal devices at the edge and for increasing the number of terminal devices supported.

Description

Method and device for transmitting downlink data This application claims priority to Chinese Patent Application No. 201010506150.1, entitled "Deletal Data Transmission Method and Equipment", filed on October 9, 2010, the entire contents of which are incorporated herein by reference. This is incorporated herein by reference. Technical field

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. (User Equipment, user equipment) needs to generate CQI (Channel Quality Indication) / PMI (Precoding Matrix Indicator) / RI ( Rank Indication, etc.) according to the measurement of CSI-RS. information.

In the 3GPP (Third Generation Partnership Project) RANI #61bis conference, it has been determined that the normal CP (normal Cyclic Prefix) and extended CP (extended Cyclic Prefix) will be respectively The 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.

In order to match the data transmission mode with application scenarios and service requirements, LTE

In Long Term Evolution (Long Term Evolution), multiple transmission modes are defined for the PDSCH (Physical Downlink Shared Channel).

For example, in LTE Rel-8, PDSCH can use 7 transmission modes:

TM1 : Single antenna port (portO) TM2 transmit diversity

TM3 open loop spatial multiplexing

TM4 closed loop spatial multiplexing

TM5 MU-MIMO

Open loop spatial multiplexing of TM6 rankl

TM7 single antenna port ( port5 )

Further, a dual-flow beamforming transmission mode based on a dual port DMRS (Demodulation Reference Signal) is introduced in LTE Rel-9, and is defined in the specification as follows:

ΤΜ8: Dual port (port7 & 8) or single port (port7 or 8)

Among them, in the above 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. .

TM7 uses port 5 and TM8 uses port 7/8.

As shown in 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.

In 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. The measurement and reporting will be based on CSI-RS.

In the process of implementing the embodiments of the present invention, the Applicant has found that the prior art has at least the following problems:

According to the current progress of standardization, transmission and feedback schemes based on 2, 4, and 8 CSI-RS measurements have been basically determined, but there is no transmission and feedback scheme based on 1-port CSI-RS measurement. Summary of the invention 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.

To achieve the above objective, 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 terminal sets the PDSCH according to y ^[p] = _x ^[ . ^] Is mapped to the configuration of the CSI-RS ports p, where, y ^[p] represents a signal on port p, x ^[. ^] represents the signal on the 0th data layer;

Transmitting, by the terminal device, the single codeword CQI to the network side device

CSI. In another aspect, the embodiment of the present invention further provides a terminal device, including: a receiving module, configured to receive a DCI, a high layer indication, and downlink data sent by a network side; and a determining module, configured to receive, according to the network received by the receiving module, The content of the DCI sent by the side device determines the type of the downlink data transmission scheme, and causes the receiving module to receive the downlink data sent by the network side device according to the type of the downlink data transmission scheme; The information received by the receiving module performs channel measurement based on the CSI-RS port to generate CSI including a single codeword CQI; if the number of CSI-RS ports is 1, when the CQI is calculated, the measurement module assumes that the PDSCH is in accordance with y ^{[ p]} = χ ^[0] is mapped to the configured CSI-RS port ρ, where y ^[p] represents the signal on port p and x ^[ ° ^] represents the signal on the 0th data layer;

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. On the other hand, 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;

Receiving, by the network side device, the single codeword CQI reported by the terminal device

CSI. On the other hand, 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:

By applying the technical solution of the embodiment of the present invention, 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. In the technical solution proposed by the embodiment of the present invention, 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. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description For some embodiments of the present invention, other drawings may be obtained from those skilled in the art without departing from the drawings. 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

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;

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.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

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).

However, there is currently no transmission mode that can measure and feedback based on 1-port CSI-RS.

In response to this problem, embodiments of the present invention propose a new transmission mode and corresponding data transmission scheme, enabling it to utilize a 1-port CSI-RS.

As shown in 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.

It should be further noted that, before the step, 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.

In practical applications, according to the setting of the corresponding transmission mode, the processing of this step is specifically divided into the following two cases:

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. In a specific application scenario, 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.

It should be further noted that when the content of the DCI is the second identifier, the second identifier further includes information about the DMRS port of the terminal device and the SCID of the DMRS port.

(Scrambling ID, 4 yog logo) information.

Step S502: The terminal device performs channel measurement based on the channel state information reference signal CSI-RS port, and generates CSI including CQI. If the number of CSI-RS ports is 1, when calculating CQI, the terminal sets PDSCH to map to the configured CSI-RS port p according to y ^[p] = χ ^[0] , where y ^[p] Represents the signal on port p, x ^[ . ] represents the signal on the 0th data layer.

In the implementation of this step, corresponding to the second case of the foregoing step, 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.

For this step, when 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. In practical applications, 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.

CSI. The implementation flow of the x^r/5 H, j 'i transmission method on the terminal device side, correspondingly, 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.

Corresponding to the case in the foregoing step S501, 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.

In a specific application scenario, 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.

It should be further noted that when the content of the DCI 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.

Step S603: The network side device receives the single codeword CQI reported by the terminal device.

CSI.

In the actual application scenario, the processing of this step is specifically as follows:

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.

It should be further noted that, in addition to receiving the CSI directly fed back by the terminal device, the network side device can also acquire a certain CSI through the SRS.

Compared with the prior art, the embodiment of the invention has the following advantages:

By applying the technical solution of the embodiment of the present invention, 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. In the technical solution proposed by the embodiment of the present invention, 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 solutions proposed in the embodiments of the present invention are described below in conjunction with specific application scenarios.

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.

Similar to other transmission modes (TM1~TM9), 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.

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. In a specific application scenario, 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.

When the terminal device works on TM10, its data transmission, channel measurement and feedback processes can be described as follows: 1, data transmission

(1) When the PDCCH uses DCI format 1A, the downlink data transmission uses a fallback transmission scheme.

Specifically, PDSCH uses the transmit diversity method specified in Rel-8/9 or single port portO

(2) When the PDCCH uses the DCI format IE, the downlink data transmission uses the primary transmission scheme.

Specifically, 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.

2, channel measurement

(1) When the terminal device side demodulates the data, the terminal device-specific reference symbols are used for channel estimation, and data demodulation is performed.

It should be noted that the demodulation process here is triggered when the terminal device is scheduled, and the same settings are also present in the subsequent embodiments, and the description is not repeated.

(2) The terminal device performs measurement based on the CSI-RS port, and generates a report parameter such as CQI. When calculating the CQI, the terminal assumes that the PDSCH is mapped to the configured CSI-RS port ρ in the manner of y ^[p] = χ ^[0] , where y ^[p] represents the signal on port ρ, and x ^[ ° ^] represents The signal on the 0th data layer;

3, feedback

The terminal device performs feedback through PUCCH and PUSCH according to the reporting mode of the high-level configuration.

It should be noted that, if 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.

Further, in combination with a specific application scenario, the technical solution of the present invention is described as follows: 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:

1, data transmission (1) When the PDCCH uses DCI format 1A, the downlink data transmission adopts a back-off transmission scheme. Specifically, the PDSCH uses the transmit diversity mode specified in Rd-8/9 or the single-ended nport0.

(2) When the PDCCH uses the DCI format IE, 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. On each physical antenna of the side device (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.

2, channel measurement

(1) At the time of data demodulation, 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.

(2) 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.

3, feedback

(1) 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).

(2) 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:

1, data transmission

(1) When the PDCCH uses DCI format 1A, the downlink data transmission adopts a back-off transmission scheme. Specifically, the PDSCH uses the transmit diversity mode specified in Rd-8/9 or the single-ended nport0.

(2) When the PDCCH uses the DCI format IE, 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.

2, channel measurement

(2) 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:

A. If the upper layer indicates that the terminal device does not perform PMI reporting, 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.

(CQI).

B. If the network side device has more than one CSI-RS port, and the upper layer instructs the terminal device to perform PMI reporting, the CSI includes a precoding matrix label (PMI) and a label (CQI) 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.

3, feedback

(1) The terminal equipment performs feedback through PUCCH and PUSCH according to the reporting mode of the high-level configuration.

(2) 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:

(2) When the PDCCH uses the DCI format IE, 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. On each physical antenna (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, channel measurement

(1) When the terminal device side demodulates data, the terminal device-specific reference symbol port 5 is used for channel estimation, and data demodulation is performed.

(2) 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.

3, feedback

(2) 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:

1, data transmission

(2) When the PDCCH uses the DCI format IE, 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. On each physical antenna (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, channel measurement

(CQI).

B. If the network side device has more than one CSI-RS port, and the upper layer instructs the terminal device to perform PMI reporting, the CSI includes a precoding matrix label (PMI) and a label (CQI) 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.

3, feedback

(2) The network side device can also obtain a certain CSI according to the SRS.

By applying the technical solution of the embodiment of the present invention, 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. In the technical solution proposed by the embodiment of the present invention, 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. In order to implement the technical solution of the embodiment of the present invention, 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:

Receiving high layer signaling configured by the network side device to configure a single port transmission mode, and/or high layer signaling including CSI type information, and/or high layer signaling for configuring a reporting mode. 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. .

In a practical application, the determining module 72 is specifically configured to:

When the content of the DCI received by the receiving module 71 is the first identifier, determining that the type of the downlink data transmission scheme is a back-off transmission scheme, and the back-off transmission scheme, specifically, the PDSCH corresponding to the terminal device uses a transmit diversity mode or a single antenna. Port mode for downlink data transmission;

When the content of the DCI received by the receiving module 71 is the second identifier, 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;

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 configured to perform channel measurement based on the CSI-RS port according to the information received by the receiving module 71, and generate CSI including a single codeword CQI. If the CSI-RS port number is 1, when calculating the CQI, The measurement module assumes that the PDSCH is mapped to the configured CSI-RS port ρ in the manner of y ^[p] = χ ^[0] , where y ^[p] represents the signal on port p, and x ^[ ° ^] represents the 0th The signal on the data layer.

It should be noted that, when the content of the DCI received by the receiving module 71 is the second identifier, and the receiving module 71 receives the scheduling indication, 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.

It should be noted that when the receiving module 71 receives the high-level signaling including the CSI type information, the measuring module 73 is specifically configured to:

Generating CSI including only a single codeword CQI when the high layer signaling indicates that the terminal device does not perform precoding matrix indication PMI reporting; 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 the precoding matrix to indicate the PMI report, the CSI including the PMI and the single codeword CQI is generated.

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.

In a specific application scenario, 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. On the other hand, 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.

In an actual application scenario, the sending module 81 is specifically configured to:

When the content of the DCI sent by the sending module 81 is the first identifier, 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. Single antenna port mode for downlink data transmission;

When the content of the DCI sent by the sending module 81 is the second identifier, 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;

When the content of the DCI sent by the sending module 81 is the second identifier, 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.

The receiving module 82 is configured to receive a CSI that includes a single codeword CQI reported by the terminal device. In an actual application, 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.

Further, the receiving module 82 is further configured to receive a certain CSI through the SRS.

By applying the technical solution of the embodiment of the present invention, 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. In the technical solution proposed by the embodiment of the present invention, 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. Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is a better implementation. the way. Based on this understanding, 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. The method described in the examples.

A person skilled in the art can understand that the drawings are only a schematic diagram of a preferred embodiment, and the modules or processes in the drawings are not necessarily required to implement the invention.

Those skilled in the art can understand that the 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.

The serial numbers of the embodiments of the present invention are merely for the description, and do not represent the advantages and disadvantages of the embodiments. The above disclosure is only a few specific embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be made by those skilled in the art should fall within the protection scope of the present invention.

Claims

Rights request

A method for transmitting downlink data, characterized in that:

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. Downstream 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 terminal sets the PDSCH to be mapped to the configured CSI-RS port p in the manner of y ^[p] = x ^[0] , where y ^{[ p} ] represents the signal on port p, x ^[ . ^] represents the signal on the 0th data layer;

CSI.

The method according to claim 1, wherein 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. Also includes:

The terminal device receives high layer signaling for configuring a single port transmission mode sent by the network side device.

The method according to claim 1, wherein the terminal device in the single-port transmission mode determines the type of the downlink data transmission scheme according to the content of the received downlink control information DCI sent by the network side device, including :

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;

When the content of the DCI is the second identifier, the terminal device determines that the type of the downlink data transmission scheme is a primary transmission scheme.

4. The method of claim 3, wherein

The back-off transmission scheme is specifically configured to perform downlink data transmission by using a transmit diversity mode or a single antenna port mode on a physical downlink shared channel PDSCH corresponding to the terminal device. Lose

The main transmission scheme is specifically that the data transmitted in the PDSCH corresponding to the terminal device is mapped to a demodulation reference signal DMRS port of the terminal device, and the corresponding data stream is mapped to each physical of the network side device. antenna.

The method of claim 4, wherein when the content of the DCI is a second identifier, the second identifier further includes information about a DMRS port of the terminal device and the DMRS port. The scrambling code identifies the SCID information.

The method of claim 5, wherein when the content of the DCI is a second identifier, and the terminal device is scheduled, the method further includes:

The terminal device performs channel measurement by using the DMRS port according to the information of the DMRS port included in the second identifier and the SCID information of the DMRS port, and demodulates the received downlink data.

The method according to claim 1, wherein when the terminal device receives the high layer signaling including the CSI type information, the terminal device performs channel measurement based on the CSI-RS port, and generates a single codeword. CSI of CQI, specifically:

When the high layer signaling indicates that the terminal device does not perform the precoding matrix indication PMI, 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 a PMI and a single codeword CQI.

The method according to claim 1, wherein the terminal device feeds back the CSI including the single codeword CQI to the network side device, specifically:

Receiving, by the terminal device, high layer signaling of a configuration reporting mode sent by the network side device;

And the terminal device feeds back the CSI including the single codeword CQI to the network side device according to the reporting mode.

9. A terminal device, comprising:

a receiving module, configured to receive DCI, high-level indication, and downlink data sent by the network side; a determining module, configured to send according to the network side device received by the receiving module

The content of the DCI, determining the type of the downlink data transmission scheme, and causing the receiving module to receive the downlink data sent by the network side device according to the type of the downlink data transmission scheme; and the measuring module, configured to receive according to the receiving module The obtained information is based on the CSI-RS port for channel measurement, and generates CSI including a single codeword CQI; if the number of CSI-RS ports is 1, when the CQI is calculated, the measurement module assumes that the PDSCH is according to y ^[p] = x ^[ . ^] Is mapped to the configuration of the CSI-RS ports p, where, y ^[p] represents a signal on port p, x ^[. ] represents the signal on the 0th data layer;

And a reporting module, configured to feed back, to the network side device, a CSI that is generated by the measurement module and includes a single codeword CQI.

The terminal device according to claim 9, wherein the receiving module is further configured to:

Receiving high layer signaling configured by the network side device to configure a single port transmission mode, and/or high layer signaling including CSI type information, and/or high layer signaling for configuring a reporting mode.

The terminal device according to claim 9, wherein the determining module is specifically configured to:

When the content of the DCI received by the receiving module is the first identifier, determining that the type of the downlink data transmission scheme is a back-off transmission scheme, where the back-off transmission scheme is specifically used by the PDSCH corresponding to the terminal equipment. Downlink data transmission in diversity mode or single antenna port mode;

When the content of the DCI received by the receiving module is the second identifier, determining that the type of the downlink data transmission scheme is a primary transmission scheme, where the primary transmission scheme is specifically transmitted in the PDSCH corresponding to the terminal device. The data is mapped to a DMRS port of the terminal device, and the corresponding data stream is mapped to each physical antenna of the network side device; wherein, when the content of the DCI received by the receiving module is the second identifier, The second identifier further includes information about a DMRS port of the terminal device and SCID information of the DMRS port.

The terminal device according to claim 11, wherein when the content of the DCI received by the receiving module is a second identifier, and the receiving module receives The measurement module is further configured to:

And performing channel measurement by using the DMRS port according to the information of the DMRS port included in the second identifier and the SCID information of the DMRS port, and demodulating the downlink data received by the receiving module.

The terminal device according to claim 10, wherein, when the receiving module receives the high layer signaling including the CSI type information, the measuring module is specifically configured to:

When the high layer signaling indicates that the terminal device does not perform precoding matrix indication PMI reporting, generating CSI including only a single codeword CQI;

When there are at least two CSI-RS ports in the network side device, and the high layer signaling instructs the terminal device to perform precoding matrix indication PMI reporting, CSI including PMI and single codeword CQI is generated.

The terminal device according to claim 10, wherein the reporting module is configured to: feed back, according to the reporting mode configured by the high layer signaling received by the receiving module, to the network side device The CSI generated by the measurement module containing the single codeword CQI.

15. A method for transmitting downlink data, characterized by comprising:

CSI.

The method according to claim 15, wherein the network side device sends a DCI to the terminal device, indicating a type of the downlink data transmission scheme of the terminal device, specifically:

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; 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 a primary transmission scheme.

17. The method of claim 16 wherein:

The back-off transmission scheme is specifically that the PDSCH corresponding to the terminal device uses a transmit diversity mode or a single antenna port mode to perform downlink data transmission;

The method of claim 17, wherein when the content of the DCI is the second identifier, the second identifier further includes information about a DMRS port of the terminal device and the DMRS port. SCID information.

The method according to claim 15, wherein the network side device receives the CSI including the single codeword CQI reported by the terminal device, specifically:

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 of the single codeword CQI that is fed back by the terminal device according to the reporting mode.

The method according to claim 15, wherein the network side device receives the CSI including the single codeword CQI reported by the terminal device, and further includes:

The network side device acquires CSI through SRS.

A network side device, comprising:

a sending module, configured to send high-level signaling to the terminal device, configure the terminal device to be a single-port transmission mode, and send a DCI to the terminal device, indicating a type of the downlink data transmission scheme of the terminal device, and according to the downlink data The type of the transmission scheme sends downlink data to the terminal device;

The receiving module is configured to receive a CSI that includes the single codeword CQI reported by the terminal device.

The terminal device according to claim 21, wherein the sending module is specifically configured to:

When the content of the DCI sent by the sending module is the first identifier, indicating the end 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 configured to perform downlink data transmission by using a transmit diversity mode or a single antenna port mode on the PDSCH corresponding to the terminal device;

When the content of the DCI sent by the sending module is the second identifier, indicating that the type of the downlink data transmission scheme of the terminal device is a primary transmission scheme, where the primary transmission scheme is specifically the PDSCH corresponding to the terminal device. The data transmitted in the data is mapped to one DMRS port of the terminal device, and the corresponding data stream is mapped to each physical antenna of the network side device;

The second identifier further includes information about a DMRS port of the terminal device and SCID information of the DMRS port, when the content of the DCI sent by the sending module is a second identifier.

The network side device according to claim 21, wherein the sending module is further configured to:

High-level signaling for configuring a single-port transmission mode to the terminal device, and/or high-level signaling including CSI type information, and/or high-level signaling for configuring a reporting mode.

The terminal device according to claim 23, wherein the receiving module is specifically configured to:

Receiving, by the terminal device, the CSI including the single codeword CQI according to the reporting mode configured by the sending module.

The terminal device according to claim 21, wherein the receiving module is further configured to:

Receive CSI through SRS.