CN115314832A

CN115314832A - Base station and downlink data transmission method

Info

Publication number: CN115314832A
Application number: CN202211014760.9A
Authority: CN
Inventors: 宋怡昕; 陈瑞欣; 林力
Original assignee: Guangzhou Shiju Network Technology Co Ltd
Current assignee: Guangzhou Shiju Network Technology Co Ltd
Priority date: 2022-08-23
Filing date: 2022-08-23
Publication date: 2022-11-08

Abstract

The application discloses a base station and a downlink data transmission method, which are used for solving the technical problem that the downlink data transmission efficiency of the base station for a terminal located in a discontinuous space is low. Wherein, a base station using N antenna networks to cover M discontinuous spaces, according to a first physical resource mapping strategy W _N,M The configuration is carried out, so that the terminal in any physical antenna coverage range can receive the SSB data and the PDCCH data, and the terminal in any physical antenna coverage range can access the network and transmit the data, thereby improving the downlink data transmission efficiency of the base station. And a first physical resource mapping policy W _N,M With different correspondence between the N physical antenna elements and the M discontinuous spaces, the multiple expression forms exist, and under the condition that the coverage areas of the multiple physical antenna elements define a single discontinuous space, the first physical resource mapping strategy W _N,M And the mapping relation between the PDSCH logical port and the physical antenna element corresponding to the discontinuous space is also enhanced, and the frequency spectrum utilization rate is improved.

Description

Base station and downlink data transmission method

Technical Field

The present application relates to the field of communications technologies, and in particular, to a base station and a downlink data transmission method.

Background

In order to improve the spectrum efficiency and robustness of wireless transmission, a multi-antenna technology is introduced into mobile communication systems such as LTE and 5G, and the functions of transmit diversity, space division multiplexing, beam forming and the like can be realized by combining a physical antenna structure, electromagnetic wave propagation characteristics and digital signal processing.

After the terminal completes the random access process and enters the RRC connected state, the base station may refer to a Physical Uplink Shared Channel (PUSCH) sent by the receiving terminal, a Channel Sensing Reference Signal (SRS), or a Channel quality information Report (CSI Report) sent by the terminal. And then the base station selects a proper PDSCH precoding code word to realize downlink multi-stream transmission so as to improve the utilization rate of the frequency spectrum of an air interface.

In the process of realizing the prior art, the inventor finds that:

in the prior art, there is an application scenario in which a base station transmits downlink data to a terminal located in a discontinuous space. Discontinuous space here refers to antenna network coverage spaces that are independent of each other and have a spatial separation. In order to meet the application scenario of discontinuous spatial distribution, an indoor baseband unit (BBU) is often connected to multiple antennas through coaxial cables or optical fibers to provide wireless signal coverage, and allow a terminal device in a discontinuous space to access a network and perform data transmission.

In order to reduce the antenna deployment cost, each antenna can only transmit single-stream data of BBU baseband data under the condition that each antenna has a single antenna element. In this case, if a typical mapping manner is adopted, only a terminal in one of the antenna coverage spaces may receive synchronization information block (SS/PBCH block, SSB) data, physical Downlink Control Channel (PDCCH) data, and single-stream Physical Downlink Shared Channel (PDSCH) data, and terminals in the other antenna coverage spaces may not receive the SSB data and the PDCCH data, that is, terminals in the other antenna coverage spaces may not complete initial access, may not perform data transmission with the base station, and may not meet application requirements. This results in that the base station cannot simultaneously perform downlink data transmission for the terminals located in the discontinuous space, which results in low downlink data transmission efficiency of the base station.

Therefore, it is necessary to provide a new downlink data transmission scheme to solve the technical problem that the downlink data transmission efficiency of the base station for the terminal located in the discontinuous space is low.

Disclosure of Invention

The embodiment of the application provides a new downlink data transmission scheme, which is used for solving the technical problem that the downlink data transmission efficiency of a base station for a terminal located in a discontinuous space is low.

Specifically, a base station that covers M discontinuous spaces using N antenna networks includes:

n physical antenna elements;

an SSB logical port;

a PDCCH logical port;

a PDSCH logical port;

the SSB logical port, the PDCCH logical port and the PDSCH logical port are mapped to the N physical antenna elements according to a first physical resource mapping strategy;

the first physical resource mapping policy includes at least a unit array configuration item and a unit vector configuration item;

the unit array configuration items are used for respectively selecting a physical antenna element from the SSB logical port, the PDCCH logical port, the PDSCH logical port and the N physical antenna elements to establish a mapping relation;

the unit vector configuration item is used for establishing a mapping relation between the SSB logical port and the PDCCH logical port and M discontinuous spaces through each physical antenna element in the N physical antenna elements;

the base station performs configuration according to a first physical resource mapping strategy so as to enable:

when the base station receives the position attribute of the user terminal, determining the space of the user terminal;

the base station schedules the user terminals in the M discontinuous spaces to form a user terminal group;

and the base station transmits downlink data to the user terminal group.

Further, when N = M, the identity array configuration item includes an identity matrix having an order equal to N;

the unit vector configuration item includes all 1 vectors that set the scaling coefficients.

Further, any column of the unit array configuration item or the unit vector configuration item represents a code word;

the first physical resource mapping policy W _N,M And also a column number index w for the code word number _k ；

When 4 antenna networks of a base station cover 4 discontinuous spaces, a first physical resource mapping strategy W _4,4 The expression is as follows:

wherein, W _4,4 Indicating that the first physical resource mapping strategy is applied to a base station with 4 antenna networks covering 4 discontinuous spaces;

and W _4,4 Indicating that the first physical resource mapping policy satisfies N = M,

first physical resource mapping policy W _4,4 Middle w ₁ To w ₄ The code words of the columns form unit array configuration items, are expressed as unit matrixes with the order equal to 4, and are used for establishing mapping relations between the PDSCH logical ports and the 4 physical antenna elements respectively; w is a ₅ The code words of the columns form unit vector configuration items, are expressed as all 1 vectors with scaling coefficients of 1/2, and are used for establishing mapping relations between the SSB logical ports and the PDCCH logical ports and the 4 physical antenna elements, so that the terminals in the 4 discontinuous spaces can receive the SSB data or the PDCCH data.

Further, when N > M, the identity array configuration item comprises an identity matrix of order equal to N;

the unit vector configuration item at least comprises all 1 vectors for setting the scaling coefficients;

the first physical resource mapping strategy also comprises a precoding enhancement matrix used for enhancing the mapping relation between the PDSCH logical port and M discontinuous spaces;

the precoding enhancement matrix at least comprises a single-stream precoding matrix corresponding to single-stream transmission of a discontinuous space where the user terminal is located and a multi-stream precoding matrix corresponding to multi-stream transmission of the discontinuous space where the user terminal is located.

Further, any column of the unit array configuration item, the unit vector configuration item or the precoding enhancement matrix represents a codeword;

When 4 antenna networks of the base station cover 2 discontinuous spaces, the first physical resource mapping strategy W _4,2 The expression is as follows:

wherein, W _4,2 Indicating that the first physical resource mapping strategy is applied to a base station with 4 antenna networks covering 2 discontinuous spaces;

and W _4,2 Indicating that the first physical resource mapping policy satisfies N > M,

first physical resource mapping policy W _4,2 Middle w ₁ To w ₄ The code words of the columns form unit array configuration items, are expressed as unit matrixes with the order equal to 4, and are used for establishing mapping relations between the PDSCH logical ports and the 4 physical antenna elements respectively; w is a ₅ The code words of the columns form unit vector configuration items, are expressed as all 1 vectors with the scaling coefficient of 1/2, and are used for establishing a mapping relation between an SSB (single sign B) logical port and a PDCCH (physical Downlink control channel) logical port and 4 physical antenna elements so that terminals in 2 discontinuous spaces can receive SSB data or PDCCH data; w is a ₆ To w ₁₃ The code words of the columns form a single-stream pre-coding matrix, and the single-stream pre-coding matrix is used for mapping single-stream PDSCH data to two physical antenna arrays in the space where the terminal is located when the base station schedules the terminal to receive PDSCH single streams so as to improve the signal quality of the single-stream PDSCH; w is a ₁₄ To w ₂₁ The code words in the column form a multi-stream precoding matrix, which is used for mapping the multi-stream PDSCH data to two physical antenna elements in the space where the terminal is located when the base station schedules the terminal to perform downlink multi-stream reception, so as to improve the multi-stream PDSCHThe quality of the signal.

Further, the precoding matrix is used to enhance mapping relationships between PDSCH logical ports and M discontinuous spaces, and specifically used to:

when the base station schedules the terminal located in the first discontinuous space for PDSCH single-stream reception, the terminal is scheduled from w ₆ To w ₉ Selecting a code word from the code words of the row to enhance the mapping relation between the PDSCH logical port and a physical antenna element corresponding to the first discontinuous space;

when the base station schedules the second discontinuous space terminal to perform PDSCH single-stream reception, the second discontinuous space terminal receives the second discontinuous space terminal from the W ₁₀ To w ₁₃ And selecting one code word from the code words of the columns so as to enhance the mapping relation between the PDSCH logical port and the physical antenna element corresponding to the second discontinuous space.

when the base station schedules the terminal positioned in the first discontinuous space for carrying out PDSCH double-current reception, the terminal is positioned in the first discontinuous space from w ₁₄ To w ₁₇ Selecting two code words from the code words of the column to enhance the mapping relation between the PDSCH logical port and the physical antenna element corresponding to the first discontinuous space;

when the base station schedules the terminal in the second discontinuous space for PDSCH double-current reception, the terminal is positioned from w ₁₈ To w ₂₁ Two code words are selected from the code words of the columns so as to enhance the mapping relation between the PDSCH logical port and the physical antenna element corresponding to the second discontinuous space.

The embodiment of the application also provides a downlink data transmission method.

Specifically, a downlink data transmission method, which cooperates with a base station that uses N antenna networks to cover M discontinuous spaces, executes the following steps:

the base station schedules the user terminals in the M spaces to form a user terminal group;

and the base station maps the SSB logical port, the PDCCH logical port and the PDSCH logical port to the N physical antenna elements according to the first physical resource mapping strategy so as to transmit downlink data to the user terminal group.

Further, the first physical resource mapping policy includes at least a unit array configuration item and a unit vector configuration item;

the unit array configuration items are used for establishing mapping relations among the SSB logical port, the PDCCH logical port, the PDSCH logical port and one of the N physical antenna elements respectively;

the unit vector configuration item is used for establishing a mapping relation between the SSB logical port, the PDCCH logical port and the M discontinuous spaces through each physical antenna element in the N physical antenna elements.

Further, the identity array configuration item comprises an identity matrix with the order equal to N;

the unit vector configuration item includes a full 1 vector setting a scaling coefficient.

The technical scheme provided by the embodiment of the application at least has the following beneficial effects:

the base station maps the strategy W according to the first physical resource _N,M The configuration is carried out, so that the terminal in any physical antenna coverage range can receive the SSB data and the PDCCH data, and the terminal in any physical antenna coverage range can access the network and transmit the data, thereby improving the downlink data transmission efficiency of the base station. And the N physical antenna elements have a corresponding relation with the M discontinuous spaces, and a first physical resource mapping strategy W _N,M With different correspondences between the N physical antenna elements and the M discontinuous spaces, the first physical resource mapping strategy W has multiple expression forms, and under the condition that the coverage areas of the multiple physical antenna elements define a single discontinuous space _N,M And the mapping relation between the PDSCH logical port and the physical antenna element corresponding to the discontinuous space is also enhanced, and the frequency spectrum utilization rate is improved. In addition, hardware does not need to be updated, and the method can be implemented only by software upgrading, so that the universality of the small base station or the indoor base station is expanded.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic structural diagram of a base station that covers M discontinuous spaces by using N antenna networks according to an embodiment of the present application.

Fig. 2 is a schematic diagram of downlink 4-stream transmission of a base station using 4 antenna networks to cover 4 discontinuous spaces according to an embodiment of the present application.

Fig. 3 is a schematic diagram of base station downlink 4-stream transmission using 4 antenna networks to cover 2 discontinuous spaces according to an embodiment of the present application.

Fig. 4 is a flowchart of a downlink data transmission method according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and 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 application.

Referring to fig. 1, to solve the technical problem that the downlink data transmission efficiency of the base station for the terminal located in the discontinuous space is low, the present application provides a base station 100 that covers M discontinuous spaces with N antenna networks, including:

n physical antenna elements 11;

SSB logical port 12;

a PDCCH logical port 13;

PDSCH logical port 14;

the SSB logical port 11, the PDCCH logical port 12 and the PDSCH logical port 13 are mapped to the N physical antenna elements 11 according to a first physical resource mapping strategy;

the first physical resource mapping policy comprises at least a unit array configuration item and a unit vector configuration item;

the unit array configuration item is used for establishing a mapping relation between the SSB logical port 12, the PDCCH logical port 13, the PDSCH logical port 14 and one physical antenna element 11 of the N physical antenna elements 11;

the unit vector configuration item is used for establishing a mapping relation between the SSB logical port 12 and the PDCCH logical port 13 and M discontinuous spaces through each physical antenna element 11 in the N physical antenna elements 11;

the base station 100 configures according to a first physical resource mapping policy, so that:

when the base station 100 receives the location attribute of the user terminal, determining the space where the user terminal is located;

the base station 100 schedules the user terminals in the M discontinuous spaces to form a user terminal group;

the base station 100 performs downlink data transmission to the user terminal group.

It should be noted that the discontinuous space refers to antenna network coverage spaces which are independent of each other and have space separation, for example, the space of each office in an office building is the discontinuous space in the present application, the space of each ward in a hospital is the discontinuous space in the present application, and the space of each house in a hotel is the discontinuous space in the present application.

The Base station 100 may have various forms, and considering that the Base station 100 needs to provide network coverage for a discontinuous space, in an actual application scenario, the Base station 100 described in this application generally adopts an indoor baseband unit (BBU) to connect with multiple antennas through a coaxial cable or an optical fiber, so as to provide wireless signal coverage for each discontinuous space, and allow terminal devices in the discontinuous space to both access a network and perform data transmission.

The physical antenna element 11 (antenna element) is a component on the antenna, and has the functions of guiding and amplifying electromagnetic waves, so that the electromagnetic signals received by the terminal are stronger. In other words, the deployment of the physical antenna elements 11 determines the network coverage space.

As will be understood by those skilled in the art, the SSB logical port 12, the PDCCH logical port 13, and the PDSCH logical port 14 need to establish a mapping relationship with the physical antenna element 11, so as to provide downlink signal transmission for a network coverage space. Specifically, different physical channels and physical signals adopt different logical port numbers, for example, the logical port number of the PDCCH is 2000, the logical port number of the ssb is 4000, and the number 14 of the pdsch logical port is 1000 to 1012. The mapping from logical port number to physical antenna is determined by the implementation of the device. The typical mapping method is to correspond the logical ports to the physical antenna elements 11 (antenna elements) or the antenna sub-arrays (antenna sub-arrays) one by one.

In a typical mapping manner, only PDSCH channels in downlink channels are precoded, the precoding maps PDSCH data to Channel state information Reference Signal ports (CSI-RS) through Demodulation Reference Signal ports (DMRSs), and multiple CSI-RS ports are mapped one to one with physical antennas, so that mapping PDSCH logical ports 14 to multiple physical antenna elements 11 is achieved, so that PDSCH data can be mapped to multiple physical antennas for transmission. While other downlink channels are not precoded, in a typical mapping manner, the SSB logical port 12 and the PDCCH logical port 13 are mapped to only a single physical antenna.

For example, if the base station supports downlink 4-stream transmission, the base station includes at least 4 physical antenna elements 11. In a typical mapping scheme, the PDSCH logical port 14 will be mapped to the first to fourth physical antennas, while the PDCCH logical port 13 and the SSB logical port 12 are mapped only to the first physical antenna. It is intuitive and obvious that the first to fourth physical antennas can transmit 4-stream PDSCH data, and only the first physical antenna can transmit PDCCH data and SSB data.

To reduce the antenna deployment cost, each antenna of the base station 100 described herein may be provided with a single antenna element 11. Therefore, the N antennas of the base station 100 described in this application correspond to the N physical antenna elements 11.

Whereas, in case that each antenna of the base station 100 is provided with only a single antenna element 11, each antenna can only transmit single stream data of BBU baseband data. In this case, if a typical mapping manner is adopted, only a terminal in one of the antenna coverage spaces may receive the SSB data, the PDCCH data, and the single-stream PDSCH data, and terminals in other antenna coverage spaces cannot receive the SSB data and the PDCCH data, so that the base station 100 cannot simultaneously perform downlink data transmission for terminals located in the discontinuous space, which results in a technical problem that the downlink data transmission efficiency of the base station 100 is low.

For this reason, the base station 100 provided in the present application performs configuration according to a first physical resource mapping policy, and maps the SSB logical port 12, the PDCCH logical port 13, and the PDSCH logical port 14 to the N physical antenna elements 11, so that the M discontinuous spaces covered by the N antenna networks can perform downlink data transmission.

Specifically, the first physical resource mapping policy at least includes a unit array configuration item and a unit vector configuration item;

the unit vector configuration item is used for establishing a mapping relationship between the SSB logical port 12 and the PDCCH logical port 13 and the M discontinuous spaces through each physical antenna element 11 of the N physical antenna elements 11.

Wherein the first physical resource mapping strategy is represented as a precoding codebook in a specific application scenario. In the process of physical resource mapping, the base station 100 configures appropriate precoding codewords for the SSB channel and the PDCCH channel according to the correspondence between the N physical antenna elements 11 and the M discontinuous spaces, so that the SSB logical port 12 and the PDCCH logical port 13 can be mapped to multiple physical antennas, and the SSB data, the PDCCH data, and the PDSCH data are sequentially placed in resource grids corresponding to the antenna ports, so that the M discontinuous spaces covered by the N antenna networks can all perform downlink data transmission.

It is noted that there is a correspondence between the N physical antenna elements 11 and the M discontinuity spaces mentioned here. This is because a single discontinuity space may be defined by the network coverage space of a single physical antenna element 11, or may be defined by the network coverage space of multiple physical antenna elements 11. Therefore, the number M of the discontinuous spaces is not necessarily larger than the number N of the physical antenna elements 11 provided in the base station 100. In other words, there will only be cases where N = M or N > M. Here, N = M or N > M is the correspondence between the N physical antenna elements 11 and the M discontinuous spaces.

On the other hand, when N = M, that is, when the network coverage space of a single physical antenna element 11 defines a single discontinuous space, each physical antenna element 11 can only transmit single-stream PDSCH data, and cannot transmit multi-stream PDSCH data, which is determined by the physical characteristics of wireless transmission. In addition, since the M discontinuous spaces are independent of each other and have natural spatial isolation, the base station 100 may determine the space where the user terminal is located when receiving the location attribute of the user terminal;

the base station 100 performs configuration according to a first physical resource mapping strategy to separate M PDSCH data streams to form downlink M stream transmission;

the base station 100 transmits downlink data to the user terminal group.

It should be noted that the process of the base station 100 receiving the location attribute of the user terminal is represented as:

after the user terminal completes the random access process and enters the RRC connected state, the base station 100 refers to a Physical Uplink Shared Channel (PUSCH) sent by the receiving terminal, a Channel Sensing Reference Signal (SRS) or a Channel quality information Report (CSI Report) sent by the terminal, and the base station 100 may obtain a location attribute of the user terminal from PUSCH data, SRS data or PRACH data sent by the user terminal. When the ue moves, the base station 100 re-obtains the location attribute of the ue according to the received uplink data to determine a new first physical resource mapping policy.

Further, in one embodiment provided herein, when N = M, the identity array configuration item includes an identity matrix with an order equal to N;

It is understood that the elements on the diagonal from the top left corner to the bottom right corner of the identity matrix of order N are all 1, and all other elements are 0. Wherein, since the order number is equal to N, the number of rows and columns of the unit matrix corresponds to the number of the physical antenna elements 11. Since N = M, the number of rows and columns of the unit matrix is M, corresponding to the number of discontinuous spaces.

On the basis that the configuration items of the unit array are used as precoding codebooks for establishing mapping relations among the SSB logical port 12, the PDCCH logical port 13, the PDSCH logical port 14 and the N physical antenna elements 11, each column of the unit array represents a precoding code word, and the precoding code words are indexed by using column numbers of 1-N. Specifically, a single precoding codeword is responsible for mapping the PDSCH logical port 14 to a single physical antenna element 11, so that terminals in M discontinuous spaces can all correctly receive PDSCH data.

It should be further emphasized that, since the elements on the diagonal line from the upper left corner to the lower right corner of the identity matrix are all 1, and all other elements are 0, the mapping of the PDSCH logical port 14 to the N physical antenna elements 11 does not cause interference on precoding, so that the quality of the downlink PDSCH data in the M discontinuous spaces is better. In addition, N antennas are located in M discontinuous spaces, and since N = M, even though the identity array configuration item appears to contain more codewords of "1" (e.g., all 1 vectors), the terminal can only receive downlink data transmitted by a single antenna in the space, and it is seen that it is more reasonable to use one codeword of the identity matrix than all 1 vector codewords.

For SSB data and PDCCH data, the base station 100 uses a unit vector configuration item to map the SSB logical port 12 and PDCCH logical port 13 of a single antenna port to the N physical antenna elements 11 by setting the full 1 vector of the scaling factor, so that terminals in M discontinuous spaces can receive the SSB data and PDCCH data. Wherein the scaling factor is a factor that keeps the total transmitted energy constant.

Further, in a specific embodiment provided in the present application, any column of the unit array configuration item or the unit vector configuration item represents a codeword;

When 4 antenna networks of the base station 100 cover 4 discontinuous spaces, the first physical resource mapping strategy W _4,4 The expression is as follows:

wherein, W _4,4 Indicates that the first physical resource mapping policy is applied to the base station 100 where 4 antenna networks cover 4 discontinuous spaces;

first physical resource mapping policy W _4,4 Middle w ₁ To w ₄ The code words of the columns form a unit array configuration item, which is expressed as a unit matrix with the order equal to 4 and used for establishing a mapping relation between the PDSCH logical port 14 and the 4 physical antenna elements 11 respectively; w is a ₅ The code words of the columns form unit vector configuration items, which are expressed as all 1 vectors with scaling coefficients of 1/2, and are used for establishing a mapping relation between the SSB logical port 12, the PDCCH logical port 13 and the 4 physical antenna elements 11, so that terminals in 4 discontinuous spaces can receive SSB data or PDCCH data.

It should be noted that the scaling factor is related to the number of transmit antennas and the number of transmit data streams. In this application, the total transmission energy of 1/4,4 antennas with the transmission energy being the original data is 1, and the scaling factor for keeping the total transmission energy of the base station unchanged is 1/2.

Referring to fig. 2, in this embodiment, the base station 100 includes 4 physical antenna elements 11. The base station 100 covers 4 separate areas with 4 physical antenna elements 11. In this application scenario, the first physical resource mapping policy is W _4,4 Is expressed, and due to a first physical resource mapping policy W _4,4 Satisfy N = M, first physical resource mapping policy W _4,4 Including a unit array configuration item and a unit vector configuration item. Wherein the identity array configuration term comprises an identity matrix having an order equal to N; the unit vector configuration item includes a full 1 vector setting a scaling factor. Of course, the first physical resource mapping policy W _N,M And also a column number index w for the code word number _k 。

Specifically, the first physical resource mapping policy W _4,4 The expression is as follows:

wherein, w ₁ To w ₄ The code words of the columns form a unit array configuration item, which is expressed as a unit matrix with the order equal to 4, and is used for establishing a mapping relationship between the PDSCH logical port 14 and the 4 physical antenna elements 11. w is a ₅ The code words of the columns form unit vector configuration items, which are expressed as all 1 vectors with scaling coefficients of 1/2, and are used for establishing a mapping relation between the SSB logical port 12, the PDCCH logical port 13 and the 4 physical antenna elements 11, so that terminals in 4 discontinuous spaces can receive SSB data or PDCCH data.

Because 4 physical antenna elements 11 are located in 4 independent discontinuous spaces, the 4 discontinuous spaces are independent of each other and have natural spatial isolation, which results in that the space where any terminal is located has only one downlink antenna. The single physical antenna element 11 can transmit only single-stream PDSCH data and cannot transmit multi-stream PDSCH data, which is determined by the physical characteristics of wireless transmission. The base station 100 may determine the space where the user terminal is located when receiving the location attribute of the user terminal; the base station 100 schedules 4 user terminals in the discontinuous space to form a user terminal group; the base station 100 performs configuration according to the first physical resource mapping policy to separate 4 PDSCH data streams to form downlink 4-stream transmission; the base station 100 performs downlink data transmission to the user terminal group.

Of course, in an actual application scenario, besides the case where the network coverage space of a single physical antenna element 11 defines a single discontinuous space, there is also the case where the network coverage spaces of multiple physical antenna elements 11 define a single discontinuous space, i.e. the case where N > M.

The following describes an implementation process of downlink data transmission from the base station 100 to the user terminal group when a single discontinuous space is defined by the network coverage space of multiple physical antenna elements 11.

Further, in one embodiment provided herein, when N > M, the identity array configuration term comprises an identity matrix having an order equal to N;

the first physical resource mapping strategy further comprises a precoding enhancement matrix for enhancing mapping relations between the PDSCH logical port 14 and the M discontinuous spaces;

It is understood that the elements on the diagonal from the top left corner to the bottom right corner of the identity matrix of order N are all 1, and all other elements are 0. Since the order number is equal to N, the number of rows and columns of the unit matrix corresponds to the number of the physical antenna elements 11.

On the basis that the configuration items of the unit array are used as precoding codebooks for establishing mapping relations among the SSB logical ports 12, the PDCCH logical ports 13, the PDSCH logical ports 14 and the N physical antenna elements 11, each column of the unit array represents a precoding code word, and the precoding code words are indexed by column numbers 1-N. Specifically, a single precoding codeword is responsible for mapping the PDSCH logical port 14 to a single physical antenna element 11, so that terminals in M discontinuous spaces can all correctly receive PDSCH data.

It should be further emphasized that, since the elements on the diagonal line from the upper left corner to the lower right corner of the identity matrix are all 1, and all other elements are 0, the mapping of the PDSCH logical port 14 to the N physical antenna elements 11 does not cause interference on precoding, so that the quality of the downlink PDSCH data in the M discontinuous spaces is better.

In addition, the first physical resource mapping strategy further includes a precoding enhancement matrix for enhancing mapping relationships between the PDSCH logical port 14 and the M discontinuous spaces. The precoding enhancement matrix at least comprises a single-stream precoding matrix corresponding to single-stream transmission of a discontinuous space where the user terminal is located and a multi-stream precoding matrix corresponding to multi-stream transmission of the discontinuous space where the user terminal is located.

Specifically, when the base station 100 schedules the terminal to perform PDSCH single-stream reception, one codeword may be selected from the single-stream precoding matrix, and the mapping relationship between the PDSCH logical port 14 and any one of the N physical antenna elements 11 is established, so as to enhance the mapping relationship between the PDSCH logical port 14 and the antenna element 11.

When the base station 100 schedules a terminal to perform downlink multi-stream reception, determining the number of PDSCH streams, and recording as a first number; selecting a code word corresponding to the first number from the multi-stream pre-coding matrix, and establishing a mapping relationship between the PDSCH logical port 14 and the physical antenna element 11 corresponding to the discontinuous space where the user terminal is located, so as to enhance the mapping relationship between the PDSCH logical port 14 and the physical antenna element 11 corresponding to the discontinuous space.

Taking the base station 100 as an example to schedule the terminal to receive the PDSCH 2 stream, 2 codewords are selected from the codebook; and the PDSCH 2 stream data adopts the 2 code words to perform precoding processing, and is mapped to 2 antennas in the space where the terminal is located to be transmitted.

Further, in a specific embodiment provided in the present application, any column of the unit array configuration item, the unit vector configuration item, or the precoding enhancement matrix represents a codeword;

When 4 antenna networks of the base station 100 cover 2 discontinuous spaces, the first physical resource mapping strategy W _4,2 The expression is as follows:

wherein, W _4,2 Indicates that the first physical resource mapping strategy is applied to the base station 100 where 4 antenna networks cover 2 discontinuous spaces;

first physical resource mapping policy W _4,2 The first 4 columns of code words are unit array configuration items, expressed as unit matrixes with the order equal to 4, and used for establishing mapping relations between the PDSCH logical ports 14 and the 4 physical antenna elements 11 respectively; the 5 th column of code words are unit vector configuration items, are expressed as full 1 vectors with scaling coefficients of 1/2, and are used for establishing a mapping relation between the SSB logical port 12, the PDCCH logical port 13 and the 4 physical antenna elements 11, so that terminals in 2 discontinuous spaces can receive SSB data or PDCCH data; the 6 th to 13 th columns of code words are single-stream pre-coding matrixes corresponding to the single-stream transmission of the discontinuous space where the user terminal is located; the 14 th to 21 st columns of code words are multi-stream precoding matrixes corresponding to the multi-stream transmission of the discontinuous space where the user terminal is located.

Referring to fig. 3, in this embodiment, the base station 100 includes 4 physical antenna elements 11. The base station 100 covers 2 separate areas with 4 physical antenna elements 11. In this application scenario, the first physical resource mapping policy is W _4,2 Is expressed, and due to a first physical resource mapping policy W _4,2 Satisfy N > M, first physical resource mapping policy W _4,2 The unit matrix configuration item, the unit vector configuration item and the precoding enhancement matrix are included. Wherein the identity array configuration term comprises an identity matrix having an order equal to N; the unit vector configuration item comprises all 1 directions for setting the scaling coefficientAnd the precoding enhancement matrix comprises a single-stream precoding matrix and a multi-stream precoding matrix. Of course, the first physical resource mapping policy W _N,M Further comprising a column number index w for the code word number _k 。

Specifically, the first physical resource mapping policy W _4,2 The expression is as follows:

wherein w ₁ To w ₄ The code words of the columns form a unit array configuration item, which is expressed as a unit matrix with the order equal to 4, and is used for establishing a mapping relationship between the PDSCH logical port 14 and the 4 physical antenna elements 11. w is a ₅ The code words of the columns form unit vector configuration items, which are expressed as full 1 vectors with scaling coefficients of 1/2, and are used for establishing a mapping relation between the SSB logical port 12 and the PDCCH logical port 13 and the 4 physical antenna elements 11, so that terminals in 2 discontinuous spaces can receive SSB data or PDCCH data. w is a ₆ To w ₁₃ The code words in the columns form a single-stream precoding matrix, which is used to map multi-stream PDSCH data to two physical antenna elements in a space where the terminal is located when the base station 100 schedules the terminal to perform PDSCH single-stream reception, so as to improve the signal quality of the multi-stream PDSCH. w is a ₁₄ To w ₂₁ The code words in the columns form a multi-stream precoding matrix, which is used to map multi-stream PDSCH data to two physical antenna elements in a space where the terminal is located when the base station 100 schedules the terminal to perform downlink multi-stream reception, so as to improve the signal quality of the multi-stream PDSCH.

The number of antennas in any discontinuous space corresponds to the number of non-0 digits in the codeword in the precoding enhancement matrix. E.g., the first discontinuous space comprises a first antenna and a second antenna, then the codeword w ₆ The first two numbers of (2) are not 0, corresponding to the two antennas of the first discontinuous space; the last 2 numbers are 0, corresponding to two antennas in the other space.

Specifically, when the base station 100 schedules the terminal located in the first discontinuous space for PDSCH single stream reception, the base station 100 may schedule the terminal from w ₆ To w ₉ Selection among codewords of a columnA codeword to enhance the mapping relationship between the PDSCH logical port 14 and any one of the physical antenna elements 11 corresponding to the first discontinuous space.

When base station 100 schedules the second non-contiguous spatial terminal for PDSCH single stream reception, base station 100 may schedule the second non-contiguous spatial terminal from w ₁₀ To w ₁₃ One of the code words in the column is selected to enhance the mapping relationship between the PDSCH logical port 14 and any one of the physical antenna elements 11 corresponding to the second discontinuous space.

When the base station 100 schedules the terminal located in the first discontinuous space for PDSCH dual-stream reception, the base station 100 may transmit the PDSCH from w ₁₄ To w ₁₇ Two code words are selected from the code words of the columns to enhance the mapping relationship between the PDSCH logical port 14 and the two physical antenna elements 11 corresponding to the first discontinuous space.

When the base station 100 schedules the second spatial discontinuous terminal for PDSCH dual stream reception, the base station 100 may receive PDSCH from w ₁₈ To w ₂₁ Two code words are selected from the code words of the columns to enhance the mapping relationship between the PDSCH logical port 14 and the two physical antenna elements 11 corresponding to the second discontinuous space.

Because 4 physical antenna elements 11 are located in 2 independent discontinuous spaces, and the 2 discontinuous spaces are independent of each other and have natural spatial isolation, this results in 2 downlink antennas in the space where any terminal is located. The single discontinuous space can only transmit 2-stream PDSCH data and cannot transmit 4-stream PDSCH data, which is determined by the physical characteristics of radio transmission. The base station 100 may determine the space where the user terminal is located when receiving the location attribute of the user terminal; the base station 100 schedules 2 user terminals in a single discontinuous space to form a user terminal group; the base station 100 maps the strategy W according to the first physical resource _4,2 Is configured from w ₁₄ To w ₂₁ Selecting proper code words from the code words of the column to separate 4 PDSCH data streams, and sending the data streams to 2 UEs to form 4 downlink stream transmission; the base station 100 performs downlink data transmission to the user terminal group.

To sum up, the base station 100 using N antenna networks to cover M discontinuous spaces provided by the present application maps a policy w according to a first physical resource _,M Make a configurationTherefore, terminals within any physical antenna coverage area can receive the SSB data and the PDCCH data, and terminals within any physical antenna coverage area can access the network and transmit data, thereby improving the downlink data transmission efficiency of the base station 100. And the N physical antenna elements 11 have a corresponding relation with the M discontinuous spaces, and a first physical resource mapping strategy W _N,M With the different correspondence between the N physical antenna elements 11 and the M discontinuous spaces, there are multiple expression forms, and under the condition that the coverage areas of the multiple physical antenna elements 11 define a single discontinuous space, the first physical resource mapping strategy W is _N,M The mapping relation between the PDSCH logical port 14 and the physical antenna element 11 corresponding to the discontinuous space is also enhanced, and the frequency spectrum utilization rate is improved.

It is also emphasized that the base station 100 provided in the present application is different from the indoor distributed base station system. An indoor distributed base station system generally uses a plurality of low-power antennas to provide overall coverage, the physical antennas are connected through a coaxial cable, a power divider and a coupler, downlink data sent by the antennas are completely the same, and a base station cannot distinguish coverage areas of different antennas and cannot perform scheduling optimization by using position information of a terminal. In the scheme, the base station 100 is supported to distinguish coverage areas of different antennas, scheduling optimization can be performed by using the position information of the terminal, downlink multi-stream transmission is realized, and the spectrum utilization rate is improved. In addition, hardware does not need to be updated, software upgrading can be carried out, and the universality of the small base station or the indoor base station is expanded.

Referring to fig. 4, in order to support the base station 100 that uses N antenna networks to cover M discontinuous spaces, the present application further provides a downlink data transmission method, so as to cooperate with the base station 100 provided by the present application to perform the following steps:

s110: and when the base station receives the position attribute of the user terminal, determining the space of the user terminal.

S120: and the base station schedules the M user terminals in the space to form a user terminal group.

S130: and the base station maps the SSB logical port, the PDCCH logical port and the PDSCH logical port to the N physical antenna oscillators according to a first physical resource mapping strategy so as to transmit downlink data to the user terminal group.

The process of the base station receiving the position attribute of the user terminal is represented as follows:

after the user terminal completes the random access process and enters the RRC connected state, the base station refers to a Physical Uplink Shared Channel (PUSCH) sent by the receiving terminal, a Channel Sensing Reference Signal (SRS) or a Channel quality information Report (CSI Report) sent by the terminal, and the base station may obtain a location attribute of the user terminal from PUSCH data, SRS data or PRACH data sent by the user terminal.

The location attribute of the ue corresponds to the discontinuous space in which the ue is located. Discontinuous space refers to antenna network coverage space that mutually independent, space interval degree exists, and the space of each office in office building for example is this application discontinuous space, and the space in each ward in the hospital is this application discontinuous space, and the space of each house in the hotel is this application discontinuous space.

The discontinuous space is divided related to the physical antenna elements of the base station, and the deployment mode of the physical antenna elements determines the network coverage space. In consideration of the fact that a Base station needs to provide network coverage for discontinuous spaces, in an actual application scenario, the Base station described in the present application generally uses an indoor baseband processing unit (BBU) to connect with multiple antennas through coaxial cables or optical fibers, so as to provide wireless signal coverage for each discontinuous space. In a typical mapping manner, only a PDSCH Channel in a downlink Channel is precoded, the precoding maps PDSCH data to a Channel state information Reference Signal port (CSI-RS) through a Demodulation Reference Signal port (DMRS), and the multiple CSI-RS ports are mapped to physical antennas one by one, so that mapping PDSCH logical ports to multiple physical antenna elements is achieved, and PDSCH data can be mapped to multiple physical antennas for transmission. However, since other downlink channels are not precoded, in a typical mapping manner, the SSB logical port and the PDCCH logical port are mapped to only a single physical antenna.

In order to reduce the deployment cost of the antenna, each antenna of the base station can be provided with a single antenna element. Therefore, the N antennas of the base station described herein correspond to the N physical antenna elements.

And under the condition that each antenna of the base station is only provided with a single antenna element, each antenna can only transmit single-stream data of BBU baseband data. In this case, if a typical mapping manner is adopted, only the terminal in one of the antenna coverage spaces may receive the SSB data, the PDCCH data, and the single-stream PDSCH data, and the terminals in the other antenna coverage spaces cannot receive the SSB data and the PDCCH data, so that the base station cannot simultaneously perform downlink data transmission for the terminals located in the discontinuous space, which results in a technical problem of low downlink data transmission efficiency of the base station.

Therefore, the base station provided by the application performs configuration according to a first physical resource mapping strategy, and maps the SSB logical port, the PDCCH logical port and the PDSCH logical port to the N physical antenna elements, so that M discontinuous spaces covered by N antenna networks can perform downlink data transmission.

Specifically, the first physical resource mapping policy includes at least a unit array configuration item and a unit vector configuration item;

the unit vector configuration item is used for establishing a mapping relation between the SSB logical port, the PDCCH logical port and the M discontinuous spaces through each of the N physical antenna elements.

Wherein the first physical resource mapping strategy is represented as a precoding codebook in a specific application scenario. In the process of physical resource mapping, a base station configures appropriate precoding code words for an SSB channel and a PDCCH channel respectively according to the corresponding relation between N physical antenna elements and M discontinuous spaces, so that an SSB logical port and a PDCCH logical port can be mapped to a plurality of physical antennas, and SSB data, PDCCH data and PDSCH data are sequentially placed into resource grids corresponding to antenna ports, so that the M discontinuous spaces covered by N antenna networks can all perform downlink data transmission.

It should be noted that, there is a correspondence between the N physical antenna elements and the M discontinuous spaces mentioned herein. This is because a single discontinuity space may be defined by the network coverage space of a single physical antenna element, or may be defined by the network coverage space of multiple physical antenna elements. Therefore, the number M of the discontinuous spaces must not be larger than the number N of the physical antenna elements provided in the base station. In other words, there will only be cases where N = M or N > M. Here, N = M or N > M is the correspondence between N physical antenna elements and M discontinuous spaces.

However, when N = M, that is, when the network coverage space of a single physical antenna element defines a single discontinuous space, each physical antenna element can only transmit single-stream PDSCH data, and cannot transmit multi-stream PDSCH data, which is determined by the physical characteristics of wireless transmission. In addition, because the M discontinuous spaces are independent of each other and have natural spatial isolation, the base station can determine the space where the user terminal is located when receiving the location attribute of the user terminal;

the base station carries out configuration according to a first physical resource mapping strategy so as to separate M PDSCH data streams and form downlink M stream transmission;

and the base station transmits downlink data to the user terminal group.

It is understood that the elements on the diagonal from the top left corner to the bottom right corner of the identity matrix of order N are all 1, and all other elements are 0. The order number is equal to N, so that the number of rows and the number of columns of the unit matrix correspond to the number of the physical antenna elements. Since N = M, the number of rows and columns of the unit matrix is M, which corresponds to the number of discontinuous spaces.

On the basis that the configuration items of the unit array are used as precoding codebooks for establishing mapping relations among the SSB logical ports, the PDCCH logical ports, the PDSCH logical ports and the N physical antenna elements, each column of the unit array represents a precoding code word, and the precoding code words are indexed by using column numbers of 1-N. Specifically, a single precoding codeword is responsible for mapping the PDSCH logical port to a single physical antenna element, so that terminals in M discontinuous spaces can all correctly receive PDSCH data.

It should be further emphasized that, since the elements on the diagonal line from the top left corner to the bottom right corner of the identity matrix are all 1, and all other elements are 0, interference on precoding does not occur when mapping the PDSCH logical port to the N physical antenna elements, and thus the quality of the downlink PDSCH data in the M discontinuous spaces is better. In addition, N antennas are located in M discontinuous spaces, and since N = M, even though the identity array configuration item appears to contain more codewords of "1" (e.g., all 1 vectors), the terminal can only receive downlink data transmitted by a single antenna in the space, and it is seen that one codeword using the identity matrix is more reasonable than all 1 vector codewords.

For SSB data and PDCCH data, a base station adopts a unit vector configuration item, and an SSB logical port and a PDCCH logical port of a single antenna port are mapped to N physical antenna elements by setting all 1 vectors of scaling coefficients, so that terminals in M discontinuous spaces can receive the SSB data and the PDCCH data. Wherein the scaling factor is a factor that keeps the total transmit energy constant.

the first physical resource mapping policy W _N,M Further comprising a column number index w for the code word number _k ；

When 4 antenna networks of the base station cover 4 discontinuous spacesInter, first physical resource mapping policy W _4,4 The expression is as follows:

first physical resource mapping policy W _4,4 Middle w ₁ To w ₄ The code words of the columns form a unit array configuration item, the unit array configuration item is represented as a unit matrix with the order equal to 4, and the unit matrix is used for establishing a mapping relation between the PDSCH logical port and the 4 physical antenna elements respectively; w is a ₅ The code words of the columns form unit vector configuration items, which are expressed as all 1 vectors with scaling coefficients of 1/2, and are used for establishing mapping relations between the SSB logical ports and the PDCCH logical ports and the 4 physical antenna elements, so that the terminals in the 4 discontinuous spaces can receive SSB data or PDCCH data.

It should be noted that the scaling factor is related to the number of transmit antennas and the number of transmit data streams. In the application, the total transmission energy of 1/4,4 antennas with the transmission energy being the original data is 1, and the scaling factor for keeping the total transmission energy of the base station unchanged is 1/2.

In this embodiment, the base station comprises 4 physical antenna elements. The base station covers 4 independent areas with 4 physical antenna elements. In this application scenario, the first physical resource mapping policy is W _4,4 Is expressed, and due to a first physical resource mapping policy W _4,4 Satisfy N = M, first physical resource mapping policy

W _4,4 Including a unit array configuration item and a unit vector configuration item. Wherein the identity array configuration term comprises an identity matrix having an order equal to N; the unit vector configuration item includes all 1 vectors that set scaling coefficients. Of course, the first physical resource mapping policy W _N,M And also a column number index w for the code word number _k 。

wherein w ₁ To w ₄ The code words of the columns form a unit array configuration item, which is expressed as a unit matrix with the order equal to 4, and is used for establishing a mapping relation between the PDSCH logical port and 4 physical antenna elements. w is a ₅ The code words of the columns form unit vector configuration items, are expressed as all 1 vectors with scaling coefficients of 1/2, and are used for establishing mapping relations between the SSB logical ports and the PDCCH logical ports and the 4 physical antenna elements, so that the terminals in the 4 discontinuous spaces can receive the SSB data or the PDCCH data.

Because 4 physical antenna elements are located in 4 independent discontinuous spaces, the 4 discontinuous spaces are independent of each other and have natural spatial isolation, and thus, a space where any terminal is located has only one downlink antenna. The single physical antenna element can only transmit single-stream PDSCH data and cannot transmit multi-stream PDSCH data, which is determined by the physical characteristics of wireless transmission. The base station can determine the space of the user terminal when receiving the position attribute of the user terminal; the base station schedules 4 user terminals in the discontinuous space to form a user terminal group; the base station performs configuration according to a first physical resource mapping strategy to separate 4 PDSCH data streams to form downlink 4-stream transmission; and the base station transmits downlink data to the user terminal group.

Of course, in an actual application scenario, besides the case where the network coverage space of a single physical antenna element defines a single discontinuous space, there is also a case where the network coverage spaces of multiple physical antenna elements define a single discontinuous space, i.e., N > M.

The following describes an implementation process of downlink data transmission from a base station to the user terminal group when a single discontinuous space is defined by a network coverage space of a plurality of physical antenna elements.

Further, in one embodiment provided herein, when N > M, the identity array configuration item comprises an identity matrix with an order equal to N;

It is understood that the elements on the diagonal from the top left corner to the bottom right corner of the identity matrix with the order equal to N are all 1, and all the other elements are 0. The order number is equal to N, so that the number of rows and the number of columns of the unit matrix correspond to the number of the physical antenna elements.

It should be further emphasized that, since the elements on the diagonal line from the top left corner to the bottom right corner of the identity matrix are all 1, and all other elements are 0, interference on precoding does not occur when the PDSCH logical port is mapped to the N physical antenna elements, and thus the quality of the downlink PDSCH data in the M discontinuous spaces is better.

For SSB data and PDCCH data, a base station adopts a unit vector configuration item, and an SSB logical port and a PDCCH logical port of a single antenna port are mapped to N physical antenna elements by setting all 1 vectors of scaling coefficients, so that terminals in M discontinuous spaces can receive the SSB data and the PDCCH data. Wherein the scaling factor is a factor that keeps the total transmitted energy constant.

In addition, the first physical resource mapping strategy further comprises a precoding enhancement matrix for enhancing mapping relations between the PDSCH logical ports and the M discontinuous spaces. The precoding enhancement matrix at least comprises a single-stream precoding matrix corresponding to single-stream transmission of a discontinuous space where the user terminal is located and a multi-stream precoding matrix corresponding to multi-stream transmission of the discontinuous space where the user terminal is located.

Specifically, when the base station scheduling terminal receives the PDSCH single stream, a codeword may be selected from the single stream precoding matrix, and a mapping relationship between the PDSCH logical port and any one of the N physical antenna elements is established, so as to enhance the mapping relationship between the PDSCH logical port and the antenna element.

When a base station scheduling terminal receives downlink multi-stream, determining the number of PDSCH streams, and recording the number as a first number; selecting a code word corresponding to the first number from the multi-stream pre-coding matrix, and establishing a mapping relation between the PDSCH logical port and a physical antenna element corresponding to a discontinuous space where the user terminal is located, so as to enhance the mapping relation between the PDSCH logical port and the physical antenna element corresponding to the discontinuous space.

When 4 antenna networks of a base station cover 2 discontinuous spaces, a first physical resource mapping strategy W _4,2 The expression is as follows:

first physical resource mapping policy W _4,2 The first 4 columns of code words are unit array configuration items, are expressed as unit matrixes with the order equal to 4, and are used for establishing mapping relations between PDSCH (physical Downlink shared channel) logical ports and 4 physical antenna elements respectively; the 5 th column of code words are unit vector configuration items, are expressed as all 1 vectors with scaling coefficients of 1/2, and are used for establishing a mapping relation between the SSB logical port and the PDCCH logical port and 4 physical antenna elements so that 2 discontinuous space terminals can receive SSB data or PDCCH data; the 6 th to 13 th columns of code words are single-stream pre-coding matrixes corresponding to single-stream transmission of the discontinuous space where the user terminal is located; the 14 th to 21 st columns of code words are multi-stream precoding matrixes corresponding to the multi-stream transmission of the discontinuous space where the user terminal is located.

In this particular embodiment, the base station comprises 4 physical antenna elements. The base station covers 2 independent areas with 4 physical antenna elements. In this application scenario, the first physical resource mapping policy is W _4,2 Expressed, and due to a first physical resource mapping policy W _4,2 Satisfying N > M, a first physical resource mapping strategy W _4,2 The precoding matrix enhancement matrix comprises a unit array configuration item, a unit vector configuration item and a precoding enhancement matrix. Wherein the identity array configuration item comprises an identity matrix having an order equal to N; the unit vector configuration item comprises all 1 vectors with scaling coefficients, and the precoding enhancement matrix comprises a single-stream precoding matrix and a multi-stream precoding matrix. Of course, the first physical resource mapping policy W _N,M And also a column number index w for the code word number _k 。

wherein，w ₁ To w ₄ The code words of the columns form a unit array configuration item, which is expressed as a unit matrix with the order equal to 4, and is used for establishing a mapping relation between the PDSCH logical port and 4 physical antenna elements. w is a ₅ The code words of the columns form unit vector configuration items, which are expressed as all 1 vectors with scaling coefficients of 1/2, and are used for establishing mapping relations between the SSB logical ports and the PDCCH logical ports and the 4 physical antenna elements, so that terminals in 2 discontinuous spaces can receive SSB data or PDCCH data. w is a ₆ To w ₁₃ The code words of the columns form a single-stream precoding matrix, and the single-stream precoding matrix is used for mapping single-stream PDSCH data to two physical antenna arrays in a space where a terminal is located when the base station schedules the terminal to perform PDSCH single-stream reception, so that the signal quality of a single-stream PDSCH is improved. w is a ₁₄ To w ₂₁ The code words in the columns form a multi-stream precoding matrix, and the multi-stream precoding matrix is used for mapping multi-stream PDSCH data to two physical antenna elements in a space where a terminal is located when the base station schedules the terminal to perform downlink multi-stream reception, so as to improve the signal quality of the multi-stream PDSCH.

The number of antennas in any discontinuous space corresponds to the number of non-0 digits in a codeword in a precoding enhancement matrix. E.g., the first discontinuous space comprises a first antenna and a second antenna, then the codeword w ₆ The first two numbers of (2) are not 0, corresponding to the two antennas of the first discontinuous space; the last 2 numbers are 0, corresponding to two antennas in the other space.

Specifically, when the base station schedules the PDSCH single-stream reception for the first discontinuous spatial terminal, the base station may schedule the PDSCH single-stream reception from w ₆ To w ₉ And selecting one code word from the code words of the columns so as to enhance the mapping relation between the PDSCH logical port and the physical antenna element corresponding to the first discontinuous space.

When the base station schedules the second discontinuous spatial terminal for PDSCH single stream reception, the base station may schedule the second discontinuous spatial terminal from w ₁₀ To w ₁₃ And selecting one code word from the code words of the columns so as to enhance the mapping relation between the PDSCH logical port and the physical antenna element corresponding to the second discontinuous space.

When the base station schedules the terminal located in the first discontinuous space for PDSCH dual-stream reception, the base station may receive PDSCH dual-stream from w ₁₄ To w ₁₇ Code of columnTwo codewords are selected from the words to enhance the mapping relationship between the PDSCH logical port and the physical antenna element corresponding to the first discontinuous space.

When the base station schedules the terminal in the second discontinuous space for PDSCH dual-stream reception, the base station can receive the PDSCH dual-stream from w ₁₈ To w ₂₁ Two code words are selected from the code words of the columns so as to enhance the mapping relation between the PDSCH logical port and the physical antenna element corresponding to the second discontinuous space.

Because 4 physical antenna elements are located in 2 independent discontinuous spaces, and the 2 discontinuous spaces are independent of each other and have natural spatial isolation, the space where any terminal is located has 2 downlink antennas. The single discontinuous space can only transmit 2-stream PDSCH data and cannot transmit 4-stream PDSCH data, which is determined by the physical characteristics of radio transmission. The base station can determine the space of the user terminal when receiving the position attribute of the user terminal; the base station schedules 2 user terminals in the single discontinuous space to form a user terminal group; the base station maps the strategy W according to the first physical resource _4,2 Is configured from w ₁₄ To w ₂₁ Selecting proper code words from the code words of the column to separate 4 PDSCH data streams, and sending the data streams to 2 UEs to form 4 downlink stream transmission; and the base station transmits downlink data to the user terminal group.

To sum up, the downlink data transmission method provided by the present application is implemented by using N antenna networks to cover M discontinuous spaces, so that the base station maps the policy W according to the first physical resource _N,M The configuration is carried out, so that the terminal in any physical antenna coverage range can receive the SSB data and the PDCCH data, and the terminal in any physical antenna coverage range can access the network and transmit the data, thereby improving the downlink data transmission efficiency of the base station. And the N physical antenna elements and the M discontinuous spaces have corresponding relations, and a first physical resource mapping strategy W _N,M With different correspondence between the N physical antenna elements and the M discontinuous spaces, the multiple expression forms exist, and under the condition that the coverage areas of the multiple physical antenna elements define a single discontinuous space, the first physical resource mapping strategy W _N,M Physical days corresponding to discontinuous space of PDSCH logical port are also enhancedThe mapping relation of the line oscillator improves the utilization rate of frequency spectrum.

It is also emphasized that the base station described in this application is different from the indoor distributed base station system. An indoor distributed base station system usually uses a plurality of small-power antennas to provide overall coverage, the physical antennas are connected through a coaxial cable, a power divider and a coupler, downlink data sent by the plurality of antennas are completely the same, and a base station cannot distinguish coverage areas of different antennas and cannot perform scheduling optimization by using position information of a terminal. The scheme supports the base station to distinguish coverage areas of different antennas, can perform scheduling optimization by using the position information of the terminal, realizes downlink multi-stream transmission, and improves the utilization rate of frequency spectrum. In addition, hardware does not need to be updated, software upgrading can be carried out, and the universality of the small base station or the indoor base station is expanded.

It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the statements "comprising one of 8230 \8230;" 8230; "defining elements does not exclude the presence of additional like elements in the process, method, article, or apparatus that comprises said elements.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A base station for covering M discontinuous spaces with N antenna networks, comprising:

n physical antenna elements;

an SSB logical port;

a PDCCH logical port;

a PDSCH logical port;

the unit vector configuration item is used for establishing a mapping relation between the SSB logical port, the PDCCH logical port and the M discontinuous spaces through each of the N physical antenna elements;

and the base station transmits downlink data to the user terminal group.

2. The base station of claim 1, wherein when N = M, the identity array configuration term includes an identity matrix having an order equal to N;

3. The base station of claim 2, wherein any column of the unit array configuration item or the unit vector configuration item represents one codeword;

w ₁ w ₂ w ₃ w ₄ w ₅

wherein, W _4,4 Indicating that the first physical resource mapping strategy is applied to the base station with 4 antenna networks covering 4 discontinuous spaces;

first physical resource mapping policy W _4,4 Middle w ₁ To w ₄ The code words of the columns form unit array configuration items, are expressed as unit matrixes with the order equal to 4, and are used for establishing mapping relations between the PDSCH logical ports and the 4 physical antenna elements respectively; w is a ₅ The code words of the columns form unit vector configuration items, which are expressed as all 1 vectors with scaling coefficients of 1/2, and are used for establishing mapping relations between the SSB logical ports and the PDCCH logical ports and the 4 physical antenna elements, so that the terminals in the 4 discontinuous spaces can receive SSB data or PDCCH data.

4. The base station of claim 1, wherein when N > M, the identity array configuration term comprises an identity matrix of order equal to N;

5. The base station of claim 4, wherein any column of the unit array configuration item, the unit vector configuration item, or the precoding enhancement matrix represents one codeword;

first physical resource mapping policy W _4,2 Middle w ₁ To w ₄ The code words of the columns form unit array configuration items, are expressed as unit matrixes with the order equal to 4, and are used for establishing mapping relations between the PDSCH logical ports and the 4 physical antenna elements respectively; w is a ₅ The code words of the columns form unit vector configuration items, are expressed as all 1 vectors with the scaling coefficient of 1/2, and are used for establishing a mapping relation between an SSB (single sign B) logical port and a PDCCH (physical Downlink control channel) logical port and 4 physical antenna elements so that terminals in 2 discontinuous spaces can receive SSB data or PDCCH data; w is a ₆ To w ₁₃ The code words of the columns form a single-stream pre-coding matrix, and the single-stream pre-coding matrix is used for mapping single-stream PDSCH data to two physical antenna arrays in the space where the terminal is located when the base station schedules the terminal to receive PDSCH single streams so as to improve the signal quality of the single-stream PDSCH; w is a ₁₄ To w ₂₁ The code words in the columns form a multi-stream precoding matrix, and the multi-stream precoding matrix is used for mapping multi-stream PDSCH data to two physical antenna elements in a space where a terminal is located when the base station schedules the terminal to perform downlink multi-stream reception, so as to improve the signal quality of the multi-stream PDSCH.

6. The base station of claim 5, wherein the precoding enhancement matrix is configured to enhance mapping relationships between PDSCH logical ports and M discontinuous spaces, and is specifically configured to:

when the base station schedules the terminal located in the first discontinuous space for PDSCH single-stream reception, the terminal is scheduled from w ₆ To w ₉ Selecting one code word from the code words of the column to enhance the mapping relation between the PDSCH logical port and a physical antenna element corresponding to the first discontinuous space;

7. The base station of claim 5, wherein the precoding enhancement matrix is configured to enhance mapping relationships between PDSCH logical ports and M discontinuous spaces, and is specifically configured to:

when the base station schedules the terminal in the second discontinuous space for PDSCH double-current reception, the terminal is positioned from w ₁₈ To w ₂₁ Two code words are selected from the code words of the column so as to enhance the mapping relation between the PDSCH logical port and the physical antenna element corresponding to the second discontinuous space.

8. A downlink data transmission method, characterized in that, in cooperation with the base station of claim 1, the following steps are executed:

9. The downlink data transmission method according to claim 8, wherein the first physical resource mapping policy includes at least a unit array configuration item and a unit vector configuration item;

10. The downlink data transmission method of claim 9, wherein the identity array configuration item includes an identity matrix having an order equal to N;