CN110855329B

CN110855329B - Method and device for determining codeword mapping mode

Info

Publication number: CN110855329B
Application number: CN201810949972.3A
Authority: CN
Inventors: 苏昕; 高秋彬; 陈润华; 缪德山
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2018-08-20
Filing date: 2018-08-20
Publication date: 2022-01-04
Anticipated expiration: 2038-08-20
Also published as: WO2020038082A1; TW202010283A; CN110855329A; TWI712296B

Abstract

The invention provides a method and a device for determining a code word mapping mode, which relate to the technical field of communication, and the method comprises the following steps: the method comprises the steps that network side equipment determines the number N of demodulation reference signal port groups (DMRS port groups) occupied by downlink transmission data sent to a terminal, wherein N is more than or equal to 1; if the network side equipment determines that the codeword transmission mode corresponding to the downlink transmission data is double-codeword transmission, the network side equipment determines the codeword mapping mode corresponding to the downlink transmission data according to the number N of DMRS port groups occupied by the downlink transmission data. The mapping mode is determined according to the number of DMRS port groups actually occupied by one downlink data channel, and the transmission quality of different transmission points can be considered, so that the performance loss of downlink data transmission is reduced.

Description

Method and device for determining codeword mapping mode

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for determining a codeword mapping manner.

Background

Mobile and broadband are the development direction of modern communication technology, and 5G, a fifth generation mobile phone mobile communication standard, also called a fifth generation mobile communication technology, is also an extension after 4G. As a main direction of development of new-generation information communication, 5G will permeate into various fields of future society, and construct an all-around information ecosystem centering on users.

MIMO technology can increase peak rate (or peak spectral efficiency) through parallel transmission of data in the spatial domain. Theoretically, according to the channel quality of each equivalent data transmission channel in the MIMO link, a corresponding Modulation and Coding Scheme (MCS) may be selected for the MIMO link, respectively, to achieve the optimization of throughput. Similar to the LTE system, in the design process of the NR MIMO system, one of the first problems is the selection of the codeword mapping scheme. This problem greatly affects the design of many physical layer solutions.

The codeword mapping scheme used in the prior art is an equal-to-equal mapping scheme, i.e., the number of layers corresponding to each codeword is equal as much as possible. When the number of layers is an even number, the number of layers of each code word is the same; when the number of layers is an odd number, the number of layers of codeword 0 is one less than that of codeword 1.

However, in the R-16 standardization work, the coordinated multi-point transmission technology is still an important technical means in the NR system, and downlink data is usually transmitted through multiple transmission points/multiple transmission planes. However, with the codeword mapping method in the prior art, the transmission quality of each transmission point is unbalanced, which affects the mapping effect, thereby causing the performance loss of downlink data transmission.

Disclosure of Invention

The invention provides a method for determining a codeword mapping mode, which is used for solving the problem that the performance loss of downlink data transmission is caused in the prior art because the transmission quality of each transmission point is unbalanced and the mapping effect is influenced.

The embodiment of the invention provides a method for determining a code word mapping mode, which comprises the following steps: the method comprises the steps that network side equipment determines the number N of demodulation reference signal port groups (DMRS port groups) occupied by downlink transmission data sent to a terminal, wherein N is more than or equal to 1;

if the network side equipment determines that the codeword transmission mode corresponding to the downlink transmission data is double-codeword transmission, the network side equipment determines the codeword mapping mode corresponding to the downlink transmission data according to the number N of DMRS port groups occupied by the downlink transmission data.

In the embodiment of the invention, the network side equipment determines the code word mapping mode according to the number of the DMRS port groups actually occupied by one data channel, and compared with the code word mapping mode which uses the specification in the prior art, the method can consider the transmission quality of different transmission points, thereby reducing the performance loss of downlink data transmission.

Further, the determining, by the network side device, the number of DMRS port groups occupied by downlink transmission data sent to the terminal includes:

the network side equipment determines the number of DMRS port groups occupied by the downlink transmission data according to at least one of the following information;

the information includes: the number of DMRS port groups recommended by the terminal, the code word mapping mode recommended by the terminal and the number of transmission layers supported by each transmission point.

In the embodiment of the invention, the network side equipment can determine the number of DMRS port groups occupied by downlink transmission data through various information, and the information can be obtained by the network side or reported by the terminal side.

Further, before the network side device determines the number of DMRS port groups occupied by downlink transmission data sent to the terminal, the method further includes:

the network side equipment receives an uplink signal sent by the terminal to the at least one transmission point;

and the network side equipment measures the uplink signal and determines the number of transmission layers supported by each transmission point.

In the embodiment of the present invention, if the number of transmission layers supported by each transmission point is determined by the network side device, the network side device needs to first receive an uplink signal sent by the terminal, and determine the number of transmission layers supported by each transmission point according to the uplink signal.

the network side equipment receives Channel State Information (CSI) reported by the terminal, wherein the CSI comprises the number of transmission layers supported by each transmission point; the number of transmission layers supported by each transmission point is obtained by the terminal measuring a downlink signal sent by the network side device through the at least one transmission point.

In the embodiment of the present invention, if the number of transmission layers supported by each transmission point is determined by the terminal, the network side device needs to first receive the CSI sent by the terminal, and determine the number of DMRS port groups occupied by downlink transmission data sent to the terminal according to the number of transmission layers supported by each transmission point carried in the CSI.

the network side equipment receives a recommendation message reported by the terminal, wherein the recommendation message comprises the recommended DMRS port group number and/or the recommended code word mapping mode; and the recommended DMRS port group number and/or the recommended code word mapping mode is determined by the terminal after measurement according to a downlink signal sent by the network side equipment to the at least one transmission point.

In the embodiment of the present invention, the network side device may further determine, according to the recommended DMRS port group number in the recommendation message reported by the terminal and/or the recommended codeword mapping manner, the DMRS port group number occupied by the downlink transmission data.

and the network side equipment determines that the number of transmission layers of the downlink shared channel PDSCH is more than 1.

In the embodiment of the present invention, if the network side device determines that the transmission layer of the PDSCH of the downlink shared channel is equal to 1, the double codeword transmission cannot be performed, so that the method for determining the codeword mapping mode is based on the premise that the number of transmission layers of the PDSCH of the downlink shared channel is greater than 1.

if the network side equipment determines that the number of transmission layers supported by each transmission point is greater than or equal to 1, determining that the number of DMRS port groups occupied by the downlink transmission data is greater than or equal to 2;

and if the network side equipment determines that the number of the transmission layers supported by only one transmission point is greater than or equal to 1, determining that the number of DMRS port groups occupied by the downlink transmission data is 1.

In the embodiment of the present invention, the network side device determines, according to the number of layers supported by each transmission point, the number of DMRS port groups occupied by downlink transmission data, that is, the network side device can determine the codeword mapping manner according to the transmission quality of each transmission point.

Further, before the network side device determines the number N of DMRS port groups occupied by downlink transmission data sent to the terminal, the method further includes:

and the network side equipment determines that the number of transmission layers of the PDSCH is more than 1.

In the embodiment of the present invention, if it is determined that the number of transmission layers of the PDSCH is equal to 1, the transmission is performed by using a single codeword and single layer transmission method in the prior art.

Further, the codeword mapping method corresponding to the downlink transmission data includes:

a mapping mode I and a mapping mode II;

in the mapping mode I, if the number of transmission layers of the PDSCH is an even number, the number of transmission layers corresponding to each code word is equal;

if the number of transmission layers of the PDSCH is an even number and an odd number, the number of transmission layers of the code word 0 is one layer less than that of the code word 1;

in the mapping scheme II, N0+ N1 is the number of transmission layers of PDSCH, where N0 is equal to or greater than 1, N1 is equal to or greater than 1, N0 is the number of transmission layers of codeword 0, and N1 is the number of transmission layers of codeword 1.

In the embodiment of the present invention, the mapping manner I is a peer-to-peer mapping manner as much as possible, and the mapping manner II does not limit the number of transmission layer numbers corresponding to two codewords, and may be a peer-to-peer mapping manner or a non-peer mapping manner.

Further, the determining, by the network side device, a codeword mapping manner corresponding to the downlink transmission data according to the number of DMRS port groups occupied by the downlink transmission data includes:

and if the network side equipment determines that the number of DMRS port groups occupied by the downlink transmission data is greater than or equal to 2, determining that a code word mapping mode corresponding to the downlink transmission data is a mapping mode II.

In the embodiment of the present invention, when it is determined that the number of DMRS port groups is greater than or equal to 2, in order to consider channel conditions of different DMRS port groups corresponding to each codeword, it may be directly determined that the codeword mapping manner is the mapping manner II.

if the network side equipment determines that the number of DMRS port groups occupied by the downlink transmission data is equal to 2, determining whether the number of transmission layers corresponding to the two DMRS port groups meets a preset rule, wherein the preset rule is determined by the network side equipment according to the number of transmission layers of the PDSCH;

and if the network side equipment determines that the transmission layer number corresponding to the two DMRS port groups meets the preset rule, determining that the code word mapping mode corresponding to the downlink transmission data is a mapping mode II.

In the embodiment of the invention, after the number of the DMRS port groups is determined to be more than or equal to 2, the number of transmission layers corresponding to the two DMRS port groups is determined, and if the preset rules are met, the code word mapping mode is determined according to the channel conditions of different DMRS port groups.

Further, the preset rule is that the sum of transmission layers corresponding to each DMRS port group satisfies a preset set, where a value range of elements in the preset set is [ 1., RI _ MAX ], and the RI _ MAX is the maximum number of transmission layers of the PDSCH; or

The preset rule is that the difference between the transmission layer numbers corresponding to the two DMRS port groups is more than or equal to 2.

Further, the determining, by the network side device, the codeword mapping manner corresponding to the downlink transmission data according to the number N of DMRS port groups occupied by the downlink transmission data includes:

and if the network side equipment determines that the number of DMRS port groups occupied by the downlink transmission data is equal to 1, determining that a code word mapping mode corresponding to the downlink transmission data is a mapping mode I according to the transmission layer number of the PDSCH.

In the embodiment of the invention, if the number of DMRS port groups occupied by downlink transmission data is equal to 1, two codewords are transmitted through one DMRS port group, and are mapped in a peer-to-peer mapping mode I as much as possible.

Further, after the network side device determines the codeword mapping manner corresponding to the downlink transmission data according to the number of DMRS port groups occupied by the downlink transmission data, the method further includes:

and the network side equipment transmits the code word mapping mode to the terminal in a signaling mode or an implicit mode so that the terminal demodulates data according to the code word mapping mode.

In the embodiment of the invention, after the network side equipment determines the code word mapping mode, the network side equipment sends the code word mapping mode to the terminal, and the terminal carries out data analysis according to the determined code word mapping mode.

Further, each DMRS port in the DMRS port group has a QCL relationship.

In the embodiment of the invention, the large-scale parameters of the reference signal channels of all DMRS ports in the DMRS port group are consistent.

The embodiment of the invention also provides a method for determining a code word mapping mode, which comprises the following steps:

the method comprises the steps that network side equipment receives a recommendation message reported by a terminal, wherein the recommendation message comprises recommended DMRS port group number and/or recommended code word mapping mode; the recommended DMRS port group number and/or the recommended code word mapping mode are determined by the terminal after measurement according to a downlink signal sent by the network side equipment through at least one transmission point;

and the network side equipment determines a code word mapping mode of downlink transmission data according to the recommended DMRS port group number and/or the recommended code word mapping mode.

In the embodiment of the invention, the network side equipment determines the code word mapping mode of downlink transmission data according to the recommended DMRS port group number and/or the recommended code word mapping mode reported by the terminal, namely the network side equipment can determine the transmission quality of each transmission point according to the recommendation message reported by the terminal and determine different code word mapping modes according to different transmission qualities.

Further, the determining, by the network side device, a codeword mapping manner of downlink transmission data according to the recommended DMRS port group number and/or the recommended codeword mapping manner includes:

and the network side equipment determines the code word mapping mode of the downlink transmission data according to the recommended DMRS port group number, the recommended code word mapping mode and implementation configuration parameters, wherein the implementation configuration parameters are determined according to the implementation mode of the network side equipment.

In the embodiment of the invention, the network side equipment determines the code word mapping mode according to the DMRS port group quantity recommended by the terminal and the recommended code word mapping mode, and also determines the code word mapping mode of downlink transmission data according to different implementation modes of the network side equipment.

Further, the determining, by the network side device, the codeword mapping manner of the downlink transmission data according to the recommended DMRS port group number, the recommended codeword mapping manner, and implementation configuration parameters includes:

and the network side equipment determines the code word mapping mode of the downlink transmission data and the number of the DMRS port groups occupied by the downlink transmission data according to the recommended number of the DMRS port groups, the recommended code word mapping mode and the implementation configuration parameters.

In the embodiment of the invention, the network side equipment can determine the code word mapping mode according to the recommendation message reported by the terminal, and can also determine the number of DMRS port groups occupied by downlink transmission data according to the recommendation message.

The invention also provides a method for determining a code word mapping mode, which comprises the following steps:

a terminal receives a downlink signal sent by network side equipment through at least one transmission point;

the terminal determines measurement data according to the downlink signal;

and the terminal reports the measurement data to the network side equipment so that the network side equipment determines a code word mapping mode corresponding to downlink transmission data according to the measurement data.

In the embodiment of the invention, the terminal determines the measurement data according to the downlink signal and reports the measurement data to the network side equipment, the network side equipment determines the code word mapping mode according to the measurement data and can demodulate the data through the code word mapping mode determined by the network side equipment.

Further, the measurement data comprises at least one of the following information:

the number of DMRS port groups recommended by the terminal, the code word mapping mode recommended by the terminal and the number of transmission layers supported by each transmission point.

In the embodiment of the present invention, the measurement data reported by the terminal may be the number of transmission layers supported by each transmission point measured by the terminal, or may also be the number of DMRS port groups and the codeword mapping manner determined by the terminal, and the terminal reports the at least one item of information to the network side device, so that the network side device determines the codeword mapping manner according to the information.

Further, the step of reporting, by the terminal to the network side device, the measurement data is the number of transmission layers supported by each transmission point, and includes: and the terminal adds the transmission layer number supported by each transmission point into Channel State Information (CSI), and reports the CSI to the network side equipment.

In the embodiment of the invention, the terminal adds the measurement data into the CSI information and then reports the CSI information to the network side equipment.

Further, before the terminal receives the downlink signal sent by the network side device through at least one transmission point, the method further includes:

and the terminal determines that the number of transmission layers of the PDSCH is more than 1.

In the embodiment of the present invention, if it is determined that the transmission layer of the downlink shared channel PDSCH is equal to 1, only one codeword can be transmitted, and the transmission is performed using the peer-to-peer mapping method corresponding to the specification in the prior art.

The embodiment of the present invention further provides a device for determining a codeword mapping manner, including:

a DMRS port group number determination unit, configured to determine a number N of DMRS port groups occupied by downlink transmission data sent to a terminal, where N is greater than or equal to 1;

and a codeword mapping mode determining unit, configured to determine, by the network side device, a codeword mapping mode corresponding to the downlink transmission data according to the number N of DMRS port groups occupied by the downlink transmission data if it is determined that the codeword transmission mode corresponding to the downlink transmission data is dual-codeword transmission.

In the embodiment of the invention, the code word mapping mode is determined according to the number of the DMRS port groups occupied by the downlink data, and the used code word mapping mode is determined according to the number of the DMRS port groups actually occupied by one data channel.

Further, the DMRS port group number determining unit is specifically configured to:

determining the number of DMRS port groups occupied by the downlink transmission data according to at least one of the following information;

Further, the DMRS port group number determining unit is further configured to:

receiving an uplink signal sent by the terminal to the at least one transmission point;

and measuring the uplink signal, and determining the number of transmission layers supported by each transmission point.

Further, the DMRS port group number determining unit is further configured to:

receiving Channel State Information (CSI) reported by the terminal, wherein the CSI comprises the number of transmission layers supported by each transmission point; the number of transmission layers supported by each transmission point is obtained by the terminal measuring a downlink signal sent by the network side equipment to the at least one transmission point.

Further, the DMRS port group number determining unit is further configured to:

receiving a recommendation message reported by the terminal, wherein the recommendation message comprises a recommended DMRS port group number and/or a recommended code word mapping mode; and the recommended DMRS port group number and/or the recommended code word mapping mode is determined by the terminal after measurement according to a downlink signal sent by the network side equipment through the at least one transmission point.

if the number of transmission layers supported by each transmission point is determined to be more than or equal to 1, determining that the number of DMRS port groups occupied by the downlink transmission data is more than or equal to 2;

and if the number of the transmission layers supported by only one transmission point is determined to be more than or equal to 1, determining that the number of DMRS port groups occupied by the downlink transmission data is 1.

Further, the DMRS port group number determining unit is further configured to:

and determining that the number of transmission layers of the PDSCH is more than 1.

a mapping mode I and a mapping mode II;

in the mapping mode I, if the number of transmission layers of the PDSCH is an even number, the number of transmission layers corresponding to each code word is equal; if the number of transmission layers of the PDSCH is an even number and an odd number, the number of transmission layers of the code word 0 is one layer less than that of the code word 1;

Further, the codeword mapping manner determining unit is specifically configured to:

and if the number of DMRS port groups occupied by the downlink transmission data is determined to be more than or equal to 2, determining that the codeword transmission mode corresponding to the downlink transmission data is a mapping mode II.

if the number of DMRS port groups occupied by the downlink transmission data is determined to be greater than or equal to 2, determining whether the number of transmission layers corresponding to the two DMRS port groups meets a preset rule, wherein the preset rule is determined by the network side equipment according to the number of transmission layers of the PDSCH;

and if the transmission layer number corresponding to the two DMRS port groups meets the preset rule, determining that the code word mapping mode corresponding to the downlink transmission data is a mapping mode II.

and if the number of DMRS port groups occupied by the downlink transmission data is determined to be equal to 1, determining a code word mapping mode corresponding to the downlink transmission data as a mapping mode I according to the transmission layer number of the PDSCH.

Further, the codeword mapping manner determining unit is further configured to:

and transmitting the code word mapping mode to the terminal in a signaling mode or an implicit mode so that the terminal demodulates data according to the code word mapping mode.

Further, each DMRS port in the DMRS port group has a QCL relationship.

An embodiment of the present invention further provides an electronic device, including:

at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any of the above embodiments.

Embodiments of the present invention also provide a non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the method of any one of the above embodiments.

the terminal comprises a receiving unit and a processing unit, wherein the receiving unit is used for receiving a recommendation message reported by the terminal, and the recommendation message comprises the recommended DMRS port group number and/or the recommended code word mapping mode; the recommended DMRS port group number and/or the recommended code word mapping mode are determined by the terminal after measurement according to a downlink signal sent by the network side equipment through at least one transmission point;

and the codeword mapping mode determining unit is used for determining the codeword mapping mode of the downlink transmission data according to the recommended DMRS port group number and/or the recommended codeword mapping mode.

In the embodiment of the invention, the code word mapping mode of the downlink transmission data is determined according to the recommended DMRS port group number and/or the recommended code word mapping mode reported by the terminal, namely, the transmission quality of each transmission point is determined according to the recommended message reported by the terminal, and different code word mapping modes are determined according to different transmission qualities.

and determining the code word mapping mode of the downlink transmission data according to the recommended DMRS port group number, the recommended code word mapping mode and implementation configuration parameters, wherein the implementation configuration parameters are determined according to the implementation mode of the network side equipment.

and determining the code word mapping mode of the downlink transmission data and the number of the DMRS port groups occupied by the downlink transmission data according to the recommended number of the DMRS port groups, the recommended code word mapping mode and the implementation configuration parameters.

a downlink signal receiving unit, configured to receive a downlink signal sent by a network side device through at least one transmission point;

a measurement data determining unit, configured to determine measurement data according to the downlink signal;

and a reporting unit, configured to report the measurement data to the network side device, so that the network side device determines, according to the measurement data, a codeword mapping manner corresponding to downlink transmission data.

In the embodiment of the invention, the measurement data is determined according to the downlink signal, the measurement data is reported to the network side equipment, the network side equipment determines the code word mapping mode according to the measurement data, and data demodulation can be carried out through the code word mapping mode determined by the network side equipment.

Further, the measurement data is the number of transmission layers supported by each transmission point, and the reporting unit is specifically configured to:

and adding the number of transmission layers supported by each transmission point into Channel State Information (CSI), and reporting the CSI to the network side equipment.

Further, the measurement data determination unit is further configured to:

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a communication architecture according to an embodiment of the present invention;

fig. 2 is a flowchart illustrating a method for determining a codeword mapping manner according to an embodiment of the present invention;

FIG. 3 is a diagram illustrating a mapping method I according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a mapping manner II provided in the embodiment of the present invention;

fig. 5 is a flowchart illustrating a method for determining a codeword mapping manner according to an embodiment of the present invention;

fig. 6 is a flowchart illustrating a method for determining a codeword mapping manner according to an embodiment of the present invention;

fig. 7 is a flowchart illustrating a method for determining a codeword mapping manner according to an embodiment of the present invention;

fig. 8 is a flowchart illustrating a method for determining a codeword mapping manner according to an embodiment of the present invention;

fig. 9 is a flowchart illustrating a method for determining a codeword mapping manner according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of an apparatus for determining a codeword mapping manner according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of an apparatus for determining a codeword mapping manner according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of an apparatus for determining a codeword mapping manner according to an embodiment of the present invention;

fig. 13 is a schematic structural diagram of an electronic device according to an embodiment of the present invention;

fig. 14 is a schematic structural diagram of an electronic device according to an embodiment of the present invention;

fig. 15 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, fig. 1 is a schematic diagram of a network structure applied in the embodiment of the present invention; as shown in fig. 1, the system includes a network side device 101 and a terminal 102. The network side device 101 may be an evolved Node B (eNB) or other base stations, and it should be noted that a specific type of the network side device 101 is not limited in this embodiment of the present invention. The network-side Device 101 may establish communication with the terminal 102, and the terminal 102 may be a Mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a laptop Computer (laptop Computer), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), a Wearable Device (Wearable Device), or other terminal devices, and it should be noted that a specific type of the terminal 102 is not limited in the embodiment of the present invention.

Based on the structure in fig. 1, an embodiment of the present invention provides a method for determining a codeword mapping manner, as shown in fig. 2, including:

step 201, a network side device determines the number N of demodulation reference signal port groups (DMRS port groups) occupied by downlink transmission data sent to a terminal, wherein N is more than or equal to 1;

step 202, if the network side device determines that the codeword transmission mode corresponding to the downlink transmission data is dual-codeword transmission, the network side device determines the codeword mapping mode corresponding to the downlink transmission data according to the number N of DMRS port groups occupied by the downlink transmission data.

In the embodiment of the present invention, the network side device performs data Transmission with the terminal through at least one Transmission Point, and optionally, in the embodiment of the present invention, each Transmission Point may be a cooperative TRP (Transmission/reception Point) or may be a cooperative antenna array plane (panel).

In the embodiment of the present invention, in the case that multiple TRP/panels perform cooperative transmission, signals transmitted by different TRP/panels may have relatively independent large-scale features, such as average delay, delay spread, average doppler shift, doppler spread, spatial domain reception parameters, and the like. In NR systems, therefore, the case where two or more reference signal channel large-scale parameters are consistent is referred to as a quasi co-located QCL. Otherwise, it is called non-QCL.

Optionally, in this embodiment of the present invention, each DMRS port in the DMRS port group has a QCL relationship, that is, each DMRS port in one group QCL.

Optionally, in this embodiment of the present invention, DMRS ports in the same CDM group also have a QCL relationship.

Optionally, in this embodiment of the present invention, each data channel supports at most two DMRS port groups.

Optionally, in this embodiment of the present invention, one DMRS port group may be transmitted through one transmission point, or may be transmitted through two transmission points, where DMRS ports corresponding to the two transmission points also have a QCL relationship.

In the embodiment of the present invention, since there is no problem that channel qualities of the number of layers corresponding to two codewords are much different when a single codeword is transmitted, a method in the prior art may be used to determine a codeword mapping manner. Therefore, in the embodiment of the present invention, it is first determined that the codeword transmission mode corresponding to the downlink transmission data is dual codeword transmission.

Optionally, in this embodiment of the present invention, a codeword transmission manner corresponding to the downlink transmission data may be determined according to the number of DMRS port groups occupied by the downlink transmission data.

For example, the first method: if the network side equipment determines that the number of DMRS port groups occupied by the downlink transmission data is greater than or equal to 2, determining that a codeword transmission mode corresponding to the downlink transmission data is double codeword transmission;

in a second mode, if the network side device determines that the number of DMRS port groups occupied by the downlink transmission data is greater than or equal to 2, determining whether the number of transmission layers supported by each transmission point meets a preset rule, where the preset rule is determined by the network side device according to the number of transmission layers of the PDSCH;

and if the network side equipment determines that the number of transmission layers supported by each transmission point meets the preset rule, determining that the code word transmission mode corresponding to the downlink transmission data is double-code word transmission.

The third method comprises the following steps: and if the network side equipment determines that the number of DMRS port groups occupied by the downlink transmission data is equal to 1, determining a code word transmission mode corresponding to the downlink transmission data according to the transmission layer number of the PDSCH.

Of course, there are many methods for determining the codeword transmission mode, which are not described herein again.

In the embodiment of the present invention, a network side device determines a codeword mapping manner according to the number of DMRS port groups occupied by downlink transmission data, and optionally, in the embodiment of the present invention, there are two codeword mapping manners, one of which is a mapping manner that is as peer as possible and is determined according to different channel qualities, which are commonly used in the prior art.

For example, as shown in fig. 3, the number of layers of each codeword in the mapping is as equal as possible. When the number of layers is even, the number of layers of each code word is the same. When the number of layers is an odd number, the number of layers of codeword 0 is one less than that of codeword 1.

Fig. 4 shows a mapping manner determined according to different channel qualities, that is, the number of layers corresponding to codeword 0 in fig. 4 is 3, and the number of layers corresponding to codeword 1 is 2.

Optionally, in the embodiment of the present invention, the mapping manner is nearly equivalent, and is referred to as mapping manner I below. And recording the mapping mode determined according to the channel quality as a mapping mode II.

In the embodiment of the present invention, in the downlink transmission process, the network side device allocates a certain number of parallel data streams to each scheduled terminal, where each data stream is referred to as a layer. After the codeword mapping mode is determined, mapping each codeword to be transmitted into at least one data layer, and transmitting through at least one data layer.

Optionally, in the embodiment of the present invention, one downlink data transmission channel supports at most 8-layer data transmission.

Optionally, in the embodiment of the present invention, before determining the codeword mapping manner corresponding to the downlink transmission data, it is further required to determine the number of transmission layers that can be supported by the downlink data transmission channel; optionally, in the embodiment of the present invention, the downlink data transmission channel is a downlink shared channel PDSCH.

In the embodiment of the present invention, both the network side device and the terminal device may determine the number of transmission layers supported by the PDSCH, and optionally, the network side device and the terminal device determine the number of transmission layers supported by the PDSCH according to the channel quality of the PDSCH.

If the number of transmission layers supported by the PDSCH determined by the network side device or the terminal device is 1, that is, only the codeword can be transmitted through 1 transmission layer, then the peer-to-peer codeword mapping manner specified by the prior art specification is used to perform codeword mapping.

If the number of transmission layers supported by the PDSCH determined by the network side equipment or the terminal equipment is greater than 1, the network side equipment determines the number of DMRS port groups again, and determines a code word mapping mode according to the number.

Optionally, in this embodiment of the present invention, when it is determined that the number of transmission layers supported by the PDSCH is greater than 1, the mapping manner I may be described as: if the number of transmission layers of the PDSCH is an even number, the number of transmission layers corresponding to each code word is equal; if the number of transmission layers of the PDSCH is an odd number, the number of transmission layers of codeword 0 is one less than the number of transmission layers of codeword 1.

And mapping mode II can be described as: n0+ N1 is the number of transmission layers of PDSCH, where N0 is equal to or greater than 1, N1 is equal to or greater than 1, N0 is the number of transmission layers of codeword 0, and N1 is the number of transmission layers of codeword 1.

Optionally, in this embodiment of the present invention, the network side device may determine, according to at least one of the following information, the number of DMRS port groups occupied by downlink transmission data:

the number of DMRS port groups recommended by the terminal;

a code word mapping mode recommended by the terminal;

the number of transmission layers supported by each transmission point.

Optionally, in the embodiment of the present invention, the number of DMRS port groups recommended by the terminal is determined by the terminal after the terminal measures the downlink signal sent by the network side device through the at least one transmission point; the code word mapping mode recommended by the terminal is determined after the terminal measures the downlink signal sent by the network side equipment through the at least one transmission point; the number of transmission layers supported by each transmission point may be determined by the terminal or determined by the network side device.

Optionally, in the embodiment of the present invention, the terminal may determine, according to measurement data measured by the network side device through the downlink signal sent by the at least one transmission point, the number of transmission layers supported by each transmission point, and report the number of transmission layers.

Optionally, in the embodiment of the present invention, the terminal adds the number of transmission layers supported by each transmission point determined by measurement to the CSI, and reports the CSI to the network side.

After receiving the CSI of the terminal, the network side determines the number of transmission layers supported by each transmission point.

Optionally, in the embodiment of the present invention, the network side device receives an uplink signal sent by the terminal through at least one transmission point, and determines, according to measurement data of the uplink signal, the number of transmission layers supported by each transmission point.

Optionally, in this embodiment of the present invention, the number of transmission layers supported by each transmission point determined by the network side device may be different from the number of transmission layers supported by each transmission point determined by the terminal.

Optionally, in this embodiment of the present invention, a scheme for determining, by a network side device according to at least one piece of information, the number of DMRS port groups occupied by downlink transmission data includes:

A. the network side equipment determines the number of DMRS port groups occupied by downlink transmission data according to the number of the DMRS port groups recommended by the terminal;

B. the network side equipment determines the number of DMRS port groups occupied by downlink transmission data according to the number of the code word mapping modes recommended by the terminal;

C. the network side equipment determines the number of DMRS port groups occupied by downlink transmission data according to the determined number of transmission layers supported by each transmission point;

D. the network side equipment determines the number of DMRS port groups occupied by downlink transmission data according to the combination of any two pieces of the three pieces of information;

E. and the network side equipment determines the number of DMRS port groups occupied by the downlink transmission data according to the combination of the three information.

Optionally, in the embodiment of the present invention, in addition to determining, by the network side device, the number of DMRS port groups occupied by the downlink transmission data according to at least one of the three pieces of information, the network side device needs to determine the number of DMRS port groups occupied by the downlink transmission data according to other information.

Optionally, in the embodiment of the present invention, the other information may be reference information corresponding to an implementation manner of the network side, for example, if the implementation manner of the network side is a reliability manner, the other information is reference information corresponding to the reliability manner.

In this embodiment of the present invention, after the network side device determines the information, the network side device may determine, according to at least one item of the information, the number of DMRS port groups occupied by the downlink transmission data.

Optionally, if the network side determines that the number of transmission layers supported by each transmission point is greater than or equal to 1 according to the information, determining that the number of DMRS port groups occupied by downlink transmission data is greater than or equal to 2; if the network side device determines that the number of transmission layers supported by only one transmission point is greater than or equal to 1, the number of DMRS port groups occupied by downlink transmission data is determined to be 1.

Optionally, in this embodiment of the present invention, each PDSCH data channel supports transmission of at least two DMRS port groups.

Optionally, in the embodiment of the present invention, after the network side determines that the number of DMRS port groups is 1, the network side performs mapping according to a peer-to-peer codeword mapping manner specified in the specification in the prior art. That is, when the number of DMRS port groups is determined to be 1, since a dual codeword is transmitted through one DMRS port group, there is no channel quality imbalance phenomenon corresponding to different DMRS port groups, and thus the codeword mapping scheme is determined to be the mapping scheme I using the specification of the prior art.

Optionally, in the embodiment of the present invention, when the network side device determines that the number of DMRS port groups occupied by the downlink transmission data is greater than or equal to 2, it is determined that two codewords may be transmitted through at least two DMRS port groups, and a channel quality imbalance phenomenon corresponding to different DMRS port groups may exist, and below, for example, the number of DMRS port groups is 2, there may be two methods for determining a codeword mapping manner. The method comprises the following steps:

firstly, the network side equipment directly determines the mapping mode as a mapping mode II;

secondly, the network side equipment determines whether the number of transmission layers corresponding to two DMRS port groups meets a preset rule, wherein the preset rule is determined by the network side equipment according to the number of transmission layers of the PDSCH; if the transmission layer number corresponding to the two DMRS port groups meets the preset rule, determining a code word mapping mode corresponding to the downlink transmission data as a mapping mode II; otherwise, determining the code word mapping mode corresponding to the downlink transmission data as the mapping mode I.

Optionally, in this embodiment of the present invention, the preset rule is that the sum of transmission layers corresponding to each DMRS port group satisfies a preset set, where a value range of elements in the preset set is [ 1.,. RI _ MAX ], and the RI _ MAX is the maximum number of transmission layers of the PDSCH; or

For example, in the embodiment of the present invention, for the preset rule, a sum of the number of transmission layers corresponding to two DMRS port groups is first determined, and a preset set is determined according to the number of transmission layers of the PDSCH, for a clearer understanding of the first preset rule, which is illustrated here, for example, as shown in fig. 5,

step 501, a network side device transmits a packet data channel (PDSCH) and a packet data channel (DMRS) according to the sum of the transmission layer numbers corresponding to two DMRS port groups;

step 502, the network device determines whether the sum of the transmission layer numbers corresponding to the two DMRS port groups belongs to a set X, if so, step 503 is executed, otherwise, step 504 is executed;

step 503, the network side device determines the codeword mapping mode as mapping mode II;

step 504, the network side device determines the codeword mapping mode as mapping mode I.

In the above example, the set X is predefined, and the elements in the set X are positive integers taken from 1 to RI _ max, where RI _ max is the maximum value of the number of transmission layers of the PDSCH.

Optionally, in the embodiment of the present invention, for a preset rule, a relationship between the difference between the transmission layer numbers supported by each transmission point and 2 is determined, and for better understanding of the preset rule, as illustrated in fig. 6 for example,

601, the network side equipment determines a layer number difference according to the transmission layer numbers corresponding to the two DMRS port groups, and the network side equipment determines the transmission layer number of the PDSCH;

step 602, the network device determines whether the layer number difference is greater than or equal to 2, if yes, step 603 is executed, otherwise step 604 is executed;

step 603, the network side device determines the codeword mapping mode as mapping mode II;

step 604, the network side device determines that the codeword mapping mode is mapping mode I.

Optionally, in the embodiment of the present invention, when it is determined that the number of DMRS port groups is greater than or equal to 3, the codeword mapping manner may also be determined according to the foregoing manner, which is not described herein again.

Optionally, in the embodiment of the present invention, after the network side device determines the codeword mapping manner, the network side device transmits the codeword mapping manner to the terminal through a signaling manner or a banking manner, and after receiving the codeword mapping manner, the terminal determines a manner of demodulating data, so as to receive downlink data.

In order to better explain the embodiment of the present invention, a transmission method provided by the embodiment of the present invention is described below through a specific implementation scenario.

In this embodiment of the present invention, a network side device determines, through an uplink signal sent by a terminal, the number of transmission layers supported by each transmission point, and if the network side device determines that the number of DMRS port groups occupied by downlink transmission data is equal to 2, a preset rule is used to determine a codeword mapping manner, where the maximum number in an X set in the preset rule is 8, and the specific steps are as shown in fig. 7:

step 701, the network side equipment determines the number of transmission layers of the PDSCH according to the state of the PDSCH;

step 702, the network side device determines whether the number of transmission layers of the PDSCH is greater than 1, if so, step 704 is executed, otherwise, step 703 is executed;

step 703, the network side device determines that the codeword mapping mode is the mapping mode I, and executes step 705;

step 704, the network side device determines the number of transmission layers supported by each transmission point according to the uplink signal sent by the terminal, and executes step 706;

step 705, the network side device transmits the codeword mapping mode to the terminal;

step 706, the network side device determines whether the number of transmission layers supported by each transmission point is greater than or equal to 1, if yes, step 708 is executed, otherwise step 707 is executed;

step 707, the network side device determines that the number of DMRS port groups used is equal to 1, and performs step 703;

step 708, the network side device determines that the number of DMRS port groups used is equal to 2;

step 709, the network side device determines whether the sum of the transmission layer numbers corresponding to the two DMRS port groups belongs to the set of [1, … 8], if yes, step 711 is executed, otherwise step 703 is executed;

step 710, the network side determines the codeword mapping mode as mapping mode II, and then executes step 705.

Based on the structure of fig. 1, an embodiment of the present invention further provides a transmission method, as shown in fig. 8, including:

step 801, a network side device receives a recommendation message reported by a terminal, wherein the recommendation message comprises a recommended DMRS port group number and/or a recommended code word mapping mode; the recommended DMRS portgroup number and/or the recommended code mapping mode are determined by the terminal after measurement according to a downlink signal sent by the network side equipment through at least one transmission point;

step 802, the network side device determines a codeword mapping mode of downlink transmission data according to the recommended DMRS port group number and/or the recommended codeword mapping mode.

Optionally, in the embodiment of the present invention, the network side device may determine the codeword mapping manner according to the following three manners.

Firstly, network side equipment determines a code word mapping mode according to the quantity of DMRS port groups recommended by a terminal;

secondly, the network side equipment determines a code word mapping mode according to the code word mapping mode recommended by the terminal;

and thirdly, the network side equipment determines the code word mapping mode according to the code word mapping mode recommended by the terminal and the DMRSport group quantity recommended by the terminal.

Optionally, in the embodiment of the present invention, for the first mode, the network side device further determines whether the single codeword mapping or the dual codeword mapping is performed according to the number of DMRS port groups recommended by the terminal, for example:

if the network side equipment determines that the number of DMRS port groups recommended by the terminal is equal to 1, determining that the code word mapping mode is single code word mapping; when the network side equipment determines that the number of DMRS port groups recommended by the terminal is equal to 2, the first determination method directly determines to use a double-code mapping mode for the network side equipment;

the second determination method is that the network side equipment determines whether the number of transmission layers supported by each transmission point meets a preset rule, wherein the preset rule is determined by the network side equipment according to the state of the PDSCH; if the network side equipment determines that the number of transmission layers supported by each transmission point meets a preset rule, determining that a code word mapping mode corresponding to downlink transmission data is double-code word mapping; otherwise, determining that the code word mapping mode corresponding to the downlink transmission data is double-code word mapping.

Similarly, in the second and third modes, if the network side device determines the DMRS port group number according to the codeword mapping mode recommended by the terminal or the network side device determines the DMRS port group number according to the codeword mapping mode recommended by the terminal and the DMRS port group number recommended by the terminal, and determines the codeword mapping mode according to the DMRS port group number, the above-described determination method may be used.

That is to say, in the embodiment of the present invention, the network side device may determine not only the codeword mapping manner but also the number of DMRS port groups according to the recommendation message. For example, the network side device performs downlink data transmission with one codeword/two DMRS port groups determined by the recommendation message, or performs downlink data transmission with two codewords/two DMRS port groups, or performs downlink data transmission with two codewords/one DMRS port group, or performs downlink data transmission with one codeword/one DMRS port group.

In this embodiment of the present invention, a network side device directly determines a codeword mapping manner according to at least one message of a recommendation message reported by a receiving terminal, and optionally, in step 802, the network side device determines the codeword mapping manner of the downlink transmission data according to the recommended DMRS port group number, the recommended codeword mapping manner, and an implementation configuration parameter, where the implementation configuration parameter is determined according to an implementation manner of the network side device.

Optionally, in the embodiment of the present invention, the implementation configuration parameter is reference information corresponding to an implementation manner of the network side, for example, if the implementation manner of the network side is reliability transmission, the implementation configuration parameter is reference information corresponding to the reliability transmission.

Based on the structure in fig. 1, an embodiment of the present invention provides a transmission method, as shown in fig. 9, including:

step 901, a terminal receives a downlink signal sent by a network side device through at least one transmission point;

step 902, the terminal determines measurement data according to the downlink signal;

step 903, the terminal reports the measurement data to the network side device, so that the network side device determines, according to the measurement data, a codeword mapping mode corresponding to downlink transmission data.

Optionally, in the embodiment of the present invention, if the number of transmission layers supported by the PDSCH determined by the terminal is 1, that is, the PDSCH channel quality is poor, and because the single codeword mapping is performed, the corresponding feedback and control overhead and complexity are low, it may be determined that the single codeword mapping manner is used.

Optionally, in step 901, the terminal receives a downlink signal sent by the network side device through a downlink data transmission channel.

Optionally, in step 902, the measurement data includes at least one of the following information:

the number of DMRS port groups recommended by the terminal, the code word mapping mode recommended by the terminal, and the number of transmission layers supported by each transmission point.

Optionally, in step 903, after the terminal determines the measurement data, the measurement data is added to the CSI and reported through the CSI.

Based on the same concept, an embodiment of the present invention further provides a transmission apparatus, as shown in fig. 10, including:

a DMRS port group number determining unit 1001 configured to determine the number N of DMRS port groups occupied by downlink transmission data sent to a terminal, where N is greater than or equal to 1;

a codeword mapping mode determining unit 1002, configured to determine that the codeword transmission mode corresponding to the downlink transmission data is dual-codeword transmission, and the network side device determines, according to the number N of dmrport groups occupied by the downlink transmission data, the codeword mapping mode corresponding to the downlink transmission data.

Further, the DMRS port group number determining unit 1001 is specifically configured to:

determining the number of DMRS portgroups occupied by the downlink transmission data according to at least one of the following information;

Further, the DMRS port group number determining unit 101 is further configured to:

Further, the DMRS port group number determining unit 1001 is further configured to:

receiving a recommendation message reported by the terminal, wherein the recommendation message comprises a recommended DMRS (demodulation reference signal) port group number and/or a recommended code word mapping mode; and the recommended DMRS port group number and/or the recommended code word mapping mode is determined by the terminal after measurement according to a downlink signal sent by the network side equipment through the at least one transmission point.

a mapping mode I and a mapping mode II;

Further, the codeword mapping manner determining unit 1002 is specifically configured to:

Further, each DMRS port in the DMRS port group has a QCL relationship.

Based on the same concept, an embodiment of the present invention further provides a transmission apparatus, as shown in fig. 11, including:

a receiving unit 1101, configured to receive a recommendation message reported by a terminal, where the recommendation message includes a recommended DMRS port group number and/or a recommended codeword mapping manner; the recommended DMRS portgroup number and/or the recommended code mapping mode are determined by the terminal after measurement is carried out according to a downlink signal sent by the network side equipment through at least one transmission point;

a codeword mapping mode determining unit 1102, configured to determine a codeword mapping mode of downlink data according to the recommended DMRS port group number and/or the recommended codeword mapping mode.

Further, the codeword mapping manner determining unit 1102 is specifically configured to:

Based on the same concept, an embodiment of the present invention further provides a transmission apparatus, as shown in fig. 12, including:

a downlink signal receiving unit 1201, configured to receive a downlink signal sent by a network side device through at least one transmission point;

a measurement data determining unit 1202, configured to determine measurement data according to the downlink signal;

a reporting unit 1203, configured to report the measurement data to the network side device, so that the network side device determines, according to the measurement data, a codeword mapping manner corresponding to downlink transmission data.

Further, the measurement data is the number of transmission layers supported by each transmission point, and the reporting unit 1203 is specifically configured to:

Further, the measurement data determination unit 1202 is further configured to:

Based on the same principle, the present invention also provides an electronic device, as shown in fig. 13, including:

the device comprises a processor 1301, a memory 1302, a transceiver 1303 and a bus interface 1304, wherein the processor 1301, the memory 1302 and the transceiver 1303 are connected through the bus interface 1304;

the processor 1301 is configured to read the program in the memory 1302, and execute the following methods:

determining the number N of demodulation reference signal port groups (DMRS portgroups) occupied by downlink transmission data sent to a terminal, wherein N is more than or equal to 1;

and if the code word transmission mode corresponding to the downlink transmission data is determined to be double-code word transmission, determining the code word mapping mode corresponding to the downlink transmission data according to the number N of DMRS port groups occupied by the downlink transmission data.

Further, the processor 1301 determines the number of DMRS port groups occupied by the downlink transmission data according to at least one of the following information;

Further, the processor 1301 is further configured to:

receiving, by the transceiver 1303, an uplink signal sent by the terminal to the at least one transmission point;

Further, the processor 1301 is further configured to:

receiving, by the transceiver 1303, CSI which includes the number of transmission layers supported by each transmission point and is reported by the terminal; the number of transmission layers supported by each transmission point is obtained by the terminal measuring a downlink signal sent by the network side equipment to the at least one transmission point.

Further, the processor 1301 is further configured to:

receiving, by the transceiver 1303, a recommendation message reported by the terminal, where the recommendation message includes a recommended DMRS port group number and/or a recommended codeword mapping manner; the recommended DMRS port group number, and/or the recommended codeword mapping manner is determined by the terminal after the terminal performs measurement according to the downlink signal sent by the network side device through the at least one transmission point.

Further, the processor 1301 is specifically configured to:

Further, the processor 1301 is further configured to:

a mapping mode I and a mapping mode II;

Further, the processor 1301 is specifically configured to:

if the number of DMRS port groups occupied by the downlink transmission data is determined to be greater than or equal to 2, whether the number of transmission layers corresponding to the two DMRS port groups meets a preset rule or not is determined by the network side equipment according to the number of transmission layers of the PDSCH;

Further, the processor 1301 is specifically configured to:

Further, the processor 1301 is further configured to:

the transceiver 1303 transmits the codeword mapping manner to the terminal in a signaling manner or an implicit manner, so that the terminal demodulates data according to the codeword mapping manner.

An embodiment of the present application provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, where the computer program includes program instructions, and when the program instructions are executed by a computer, the computer executes any one of the above methods for determining a codeword mapping manner.

Based on the same principle, the present invention also provides an electronic device, as shown in fig. 14, including:

the device comprises a processor 1201, a memory 1402, a transceiver 1403 and a bus interface 1404, wherein the processor 1401, the memory 1402 and the transceiver 1403 are connected through the bus interface 1404;

the processor 1401 is configured to read the program in the memory 1402, and execute the following method:

receiving, by the transceiver 1403, a recommendation message reported by a terminal, where the recommendation message includes a recommended DMRS port group number and/or a recommended codeword mapping manner; the recommended DMRS portgroup number and/or the recommended code mapping mode are determined by the terminal after measurement according to a downlink signal sent by the network side equipment through at least one transmission point;

and determining a code word mapping mode of downlink transmission data according to the recommended DMRS port group number and/or the recommended code word mapping mode.

Further, the processor 1401 is specifically configured to:

Based on the same principle, the present invention also provides an electronic device, as shown in fig. 15, including:

the system comprises a processor 1501, a memory 1502, a transceiver 1503 and a bus interface 1504, wherein the processor 1501, the memory 1502 and the transceiver 1503 are connected through the bus interface 1504;

the processor 1501 is configured to read the program in the memory 1502, and execute the following methods:

receiving, by the transceiver 1503, a downlink signal transmitted by a network-side device through at least one transmission point;

determining measurement data according to the downlink signal;

and reporting the measurement data to the network side equipment so that the network side equipment determines a code word mapping mode corresponding to downlink transmission data according to the measurement data.

Further, the measurement data is the number of transmission layers supported by each transmission point, and the processor 1501 is specifically configured to:

Further, the processor 1501 is further configured to:

Embodiments of the present application provide a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, cause the computer to perform any of the above methods of determining a manner of codeword mapping.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A method for determining a codeword mapping scheme, the method comprising:

the method comprises the steps that network side equipment determines the number N of demodulation reference signal port groups (DMRS port groups) occupied by downlink transmission data sent to a terminal, wherein N is more than or equal to 1;

2. The method of claim 1, wherein the determining, by the network-side device, the number of DMRS port groups occupied by downlink transmission data sent to the terminal includes:

3. The method of claim 2, wherein before the network-side device determines the number of DMRS port groups occupied by downlink transmission data sent to the terminal, the method further comprises:

4. The method of claim 2, wherein before the network-side device determines the number of DMRS port groups occupied by downlink transmission data sent to the terminal, the method further comprises:

the network side equipment receives Channel State Information (CSI) reported by the terminal, wherein the CSI comprises the number of transmission layers supported by each transmission point; the number of transmission layers supported by each transmission point is obtained by the terminal measuring a downlink signal sent by the network side equipment to the at least one transmission point.

5. The method of claim 2, wherein before the network-side device determines the number of DMRS port groups occupied by downlink transmission data sent to the terminal, the method further comprises:

6. The method of claim 2, wherein the determining, by the network-side device, the number of DMRS port groups occupied by downlink transmission data sent to the terminal includes:

7. The method according to any one of claims 2 to 6, wherein before the network side device determines the number N of DMRS port groups occupied by downlink transmission data sent to the terminal, the method further includes:

8. The method of claim 7, wherein the codeword mapping manner corresponding to the downlink transmission data comprises:

a mapping mode I and a mapping mode II;

9. The method according to claim 8, wherein the determining, by the network-side device, the codeword mapping manner corresponding to the downlink transmission data according to the number N of DMRS port groups occupied by the downlink transmission data includes:

10. The method according to claim 8, wherein the determining, by the network-side device, the codeword mapping manner corresponding to the downlink transmission data according to the number of DMRS port groups occupied by the downlink transmission data includes:

if the network side equipment determines that the number of DMRS port groups occupied by the downlink transmission data is greater than or equal to 2, determining whether the number of transmission layers corresponding to the two DMRS port groups meets a preset rule, wherein the preset rule is determined by the network side equipment according to the number of transmission layers of the PDSCH;

11. The method according to claim 10, wherein the preset rule is that the sum of the transmission layers corresponding to each DMRS port group satisfies a preset set, wherein the values of elements in the preset set range from [ 1...., RI _ MAX ], and the RI _ MAX is the maximum number of transmission layers of the PDSCH; or

12. The method according to claim 8, wherein the determining, by the network-side device, the codeword mapping manner corresponding to the downlink transmission data according to the number N of DMRS port groups occupied by the downlink transmission data includes:

13. The method according to claim 1, wherein after the network-side device determines, according to the number N of DMRS port groups occupied by the downlink transmission data, a codeword mapping manner corresponding to the downlink transmission data, the method further includes:

14. The method of claim 1, wherein each DMRS port in the DMRS port group has a QCL relationship.

15. An apparatus for determining a codeword mapping scheme, comprising:

the device comprises a DMRS port group quantity determining unit, a demodulation reference signal port group quantity determining unit and a demodulation reference signal port group quantity determining unit, wherein the DMRS port group quantity determining unit is used for determining the quantity N of demodulation reference signal port groups occupied by downlink transmission data sent to a terminal, and N is more than or equal to 1;

and if the codeword mapping mode corresponding to the downlink transmission data is determined to be dual-codeword transmission, the network side device determines the codeword mapping mode corresponding to the downlink transmission data according to the number N of DMRS port groups occupied by the downlink transmission data.

16. An electronic device, comprising:

at least one processor; and the number of the first and second groups,

a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,

the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-14.

17. A non-transitory computer readable storage medium storing computer instructions for causing a computer to perform the method of any one of claims 1 to 14.