Base station, downlink data transmission method

Abstract

The present application discloses a base station and a downlink data transmission method, which are used to solve the technical problem of low downlink data transmission efficiency of a base station for a terminal located in a discontinuous space. Among them, 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 performed so that any terminal within the coverage of the physical antenna can receive SSB data and PDCCH data, and any terminal within the coverage of the physical antenna can access the network and transmit data, thereby improving the downlink data transmission efficiency of the base station. And the first physical resource mapping strategy W N,M There are multiple forms of expression as the correspondence between N physical antenna elements and M discontinuous spaces is different. In the case where the coverage of multiple physical antenna elements defines a single discontinuous space, the first physical resource mapping strategy W N,M The mapping relationship between the PDSCH logical port and the physical antenna element corresponding to the discontinuous space is also enhanced, thereby improving the spectrum utilization rate.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a base station and a downlink data transmission method. Background Art

[0002] In order to improve the spectral efficiency and robustness of wireless transmission, mobile communication systems such as LTE and 5G have introduced multi-antenna technology. By combining the physical antenna structure, electromagnetic wave propagation characteristics and digital signal processing, functions such as transmit diversity, spatial division multiplexing and beamforming can be realized.

[0003] After the terminal completes the random access process and enters the RRC connection state, the base station can refer to the Physical Uplink Share Channel (PUSCH), Channel Sensing Reference Signal (SRS) or Channel Quality Information Report (CSI Report) sent by the receiving terminal. The base station then selects the appropriate PDSCH precoding codeword to achieve downlink multi-stream transmission to improve the spectrum utilization of the air interface.

[0004] In the process of implementing the prior art, the inventor discovered that:

[0005] The prior art has an application scenario in which a base station transmits downlink data to a terminal located in a discontinuous space. The discontinuous space here refers to the antenna network coverage space that is independent of each other and has a spatial separation. In order to meet the application scenario of discontinuous spatial distribution, an indoor baseband processing unit (Base band Unite, BBU) is often used to connect to multiple antennas through coaxial cables or optical fibers to provide wireless signal coverage, allowing terminal devices in discontinuous spaces to access the network and transmit data.

[0006] In order to reduce the antenna deployment cost, when each antenna has a single antenna vibrator, each antenna can only transmit single-stream data of BBU baseband data. In this case, if a typical mapping method is used, only the terminals in the coverage space of one of the antennas can receive synchronization information block (SS / PBCH block, SSB) data, physical downlink control channel (Physical Downlink Control Channel, PDCCH) data and single-stream physical downlink shared channel (Physical Downlink Share Channel, PDSCH) data, and the terminals in the coverage space of other antennas cannot receive SSB data and PDCCH data, that is, the terminals in the coverage space of other antennas cannot complete initial access, cannot transmit data with the base station, and cannot meet application requirements. This results in the base station being unable to simultaneously perform downlink data transmission for terminals located in discontinuous spaces, resulting in low downlink data transmission efficiency of the base station.

[0007] Therefore, it is necessary to provide a new downlink data transmission solution to solve the technical problem of low downlink data transmission efficiency of a base station to a terminal located in a discontinuous space. Summary of the invention

[0008] The embodiment of the present application provides a new downlink data transmission solution to solve the technical problem of low downlink data transmission efficiency of a base station for a terminal located in a discontinuous space.

[0009] Specifically, a base station using N antenna networks to cover M discontinuous spaces includes:

[0010] N physical antenna elements;

[0011] SSB logical port;

[0012] PDCCH logical port;

[0013] PDSCH logical port;

[0014] 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;

[0015] The first physical resource mapping strategy includes at least a unit array configuration item and a unit vector configuration item;

[0016] The unit array configuration item is used to establish a mapping relationship between an SSB logical port, a PDCCH logical port, a PDSCH logical port and one physical antenna element among N physical antenna elements;

[0017] The unit vector configuration item is used to establish a mapping relationship between the SSB logical port, the PDCCH logical port and the M discontinuous spaces through each of the N physical antenna elements;

[0018] The base station is configured according to the first physical resource mapping strategy so that:

[0019] When the base station receives the location attribute of the user terminal, it determines the space where the user terminal is located;

[0020] The base station schedules the M user terminals in the discontinuous spaces to form a user terminal group;

[0021] The base station performs downlink data transmission to the user terminal group.

[0022] Further, when N=M, the unit array configuration item includes a unit matrix of order equal to N;

[0023] The unit vector configuration item consists of a vector of all 1s that sets the scaling factor.

[0024] Further, any column of the unit array configuration item or the unit vector configuration item represents a codeword;

[0025] The first physical resource mapping strategy W N,M Also includes the column number index w for codeword numbering k ;

[0026] When the four antenna networks of the base station cover four discontinuous spaces, the first physical resource mapping strategy W 4,4 It manifests as:

[0027]

[0028] Among them, W 4,4 Indicates that the first physical resource mapping strategy is applied to a base station with four antenna networks covering four discontinuous spaces;

[0029] And W 4,4 Indicates that the first physical resource mapping strategy satisfies N=M,

[0030] The first physical resource mapping strategy W 4,4 The codewords in columns w1 to w4 constitute unit array configuration items, which are expressed as unit matrices with an order of 4, and are used to establish mapping relationships between the PDSCH logical ports and the four physical antenna elements respectively; the codewords in column w5 constitute unit vector configuration items, which are expressed as all-1 vectors with a scaling factor of 1 / 2, and are used to establish mapping relationships between the SSB logical port and the PDCCH logical port and the four physical antenna elements, so that terminals in four discontinuous spaces can receive SSB data or PDCCH data.

[0031] Further, when N>M, the unit array configuration item includes a unit matrix of order equal to N;

[0032] The unit vector configuration item includes at least an all-ones vector that sets the scaling factor;

[0033] The first physical resource mapping strategy also includes a precoding enhancement matrix for enhancing the mapping relationship between the PDSCH logical port and the M discontinuous spaces;

[0034] The precoding enhancement matrix at least includes a single-stream precoding matrix corresponding to single-stream transmission in the discontinuous space where the user terminal is located, and a multi-stream precoding matrix corresponding to multi-stream transmission in the discontinuous space where the user terminal is located.

[0035] Further, any column of the unit array configuration item, the unit vector configuration item or the precoding enhancement matrix represents a codeword;

[0036] The first physical resource mapping strategy W N,M Also includes the column number index w for codeword numbering k ;

[0037] When the four antenna networks of the base station cover two discontinuous spaces, the first physical resource mapping strategy W 4,2 It manifests as:

[0038]

[0039] Among them, W 4,2 Indicates that the first physical resource mapping strategy is applied to a base station with four antenna networks covering two discontinuous spaces;

[0040] And W 4,2 Indicates that the first physical resource mapping strategy satisfies N>M,

[0041] The first physical resource mapping strategy W 4,2 The codewords in columns w1 to w4 constitute unit array configuration items, which are expressed as unit matrices with an order of 4, and are used to establish mapping relationships between PDSCH logical ports and four physical antenna elements respectively; the codewords in columns w5 constitute unit vector configuration items, which are expressed as all-1 vectors with a scaling factor of 1 / 2, and are used to establish mapping relationships between SSB logical ports and PDCCH logical ports and four physical antenna elements, so that terminals in two discontinuous spaces can receive SSB data or PDCCH data; 13 The codewords in the columns constitute a single-stream precoding matrix, which is used to map the single-stream PDSCH data to the two physical antenna arrays in the space where the terminal is located when the base station schedules the terminal to receive the single-stream PDSCH, so as to improve the signal quality of the single-stream PDSCH; 14 tow 21The codewords in the columns constitute a multi-stream precoding matrix, which is used to map 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 signal quality of the multi-stream PDSCH.

[0042] Further, the precoding enhancement matrix is ​​used to enhance the mapping relationship between the PDSCH logical port and the M discontinuous spaces, specifically for:

[0043] When the base station schedules the terminal located in the first discontinuous space to perform PDSCH single-stream reception, a codeword is selected from the codewords in columns w6 to w9 to enhance the mapping relationship between the PDSCH logical port and the physical antenna element corresponding to the first discontinuous space;

[0044] When the base station schedules the terminal located in the second discontinuous space to receive a single stream of PDSCH, 10 tow 13 A codeword is selected from the codewords in the column to enhance the mapping relationship between the PDSCH logical port and the physical antenna element corresponding to the second discontinuous space.

[0045] Further, the precoding enhancement matrix is ​​used to enhance the mapping relationship between the PDSCH logical port and the M discontinuous spaces, specifically for:

[0046] When the base station schedules the terminal located in the first discontinuous space to perform PDSCH dual-stream reception, 14 tow 17 Select two codewords from the codewords in the column to enhance the mapping relationship between the PDSCH logical port and the physical antenna element corresponding to the first discontinuous space;

[0047] When the base station schedules the terminal located in the second discontinuous space to perform PDSCH dual-stream reception, 18 tow 21 Two codewords are selected from the codewords in the column to enhance the mapping relationship between the PDSCH logical port and the physical antenna element corresponding to the second discontinuous space.

[0048] The embodiment of the present application also provides a downlink data transmission method.

[0049] Specifically, a downlink data transmission method is performed by using a base station with N antenna networks covering M discontinuous spaces to perform the following steps:

[0050] When the base station receives the location attribute of the user terminal, it determines the space where the user terminal is located;

[0051] The base station schedules the M user terminals in the space to form a user terminal group;

[0052] 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 to perform downlink data transmission to the user terminal group.

[0053] Further, the first physical resource mapping strategy includes at least a unit array configuration item and a unit vector configuration item;

[0054] The unit array configuration item is used to establish a mapping relationship between an SSB logical port, a PDCCH logical port, a PDSCH logical port and one physical antenna element among N physical antenna elements;

[0055] The unit vector configuration item is used to establish a mapping relationship between the SSB logical port, the PDCCH logical port and the M discontinuous spaces through each of the N physical antenna elements.

[0056] Further, the unit array configuration item includes a unit matrix having an order equal to N;

[0057] The unit vector configuration item consists of a vector of all 1s that sets the scaling factor.

[0058] The technical solution provided in the embodiments of the present application has at least the following beneficial effects:

[0059] The base station uses the first physical resource mapping strategy W N,M The configuration is performed so that any terminal within the coverage of the physical antenna can receive SSB data and PDCCH data, and any terminal within the coverage of the physical antenna can access the network and transmit data, thereby improving the downlink data transmission efficiency of the base station. There is a corresponding relationship between the N physical antenna elements and the M discontinuous spaces. The first physical resource mapping strategy W N,M There are multiple forms of expression as the correspondence between N physical antenna elements and M discontinuous spaces is different. In the case where the coverage of multiple physical antenna elements defines a single discontinuous space, the first physical resource mapping strategy W N,M The mapping relationship between the PDSCH logical port and the corresponding physical antenna element in the discontinuous space is also enhanced, which improves the spectrum utilization. Moreover, this solution does not require hardware updates, but can be implemented by only software upgrades, which expands the versatility of small base stations or indoor base stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0061] Figure 1A schematic diagram of the structure of a base station using N antenna networks to cover M discontinuous spaces is provided in an embodiment of the present application.

[0062] Figure 2 A schematic diagram of a base station downlink 4-stream transmission using 4 antenna networks covering 4 discontinuous spaces is provided in an embodiment of the present application.

[0063] Figure 3 A schematic diagram of a base station downlink 4-stream transmission using a 4-antenna network covering 2 discontinuous spaces is provided in an embodiment of the present application.

[0064] Figure 4 A flowchart of a downlink data transmission method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0066] Please refer to Figure 1 In order to solve the technical problem of low downlink data transmission efficiency of a base station for a terminal located in a discontinuous space, the present application provides a base station 100 using an N antenna network to cover M discontinuous spaces, including:

[0067] N physical antenna elements 11;

[0068] SSB logical port 12;

[0069] PDCCH logical port 13;

[0070] PDSCH logical port 14;

[0071] 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;

[0072] The first physical resource mapping strategy includes at least a unit array configuration item and a unit vector configuration item;

[0073] The unit array configuration item is used to respectively establish a mapping relationship between the SSB logical port 12, the PDCCH logical port 13, the PDSCH logical port 14 and one physical antenna element 11 selected from the N physical antenna elements 11;

[0074] The unit vector configuration item is used to establish a mapping relationship between the SSB logical port 12 and the PDCCH logical port 13 and the M discontinuous spaces through each of the N physical antenna elements 11;

[0075] The base station 100 is configured according to the first physical resource mapping strategy so that:

[0076] When the base station 100 receives the location attribute of the user terminal, it determines the space where the user terminal is located;

[0077] The base station 100 schedules the user terminals in the M discontinuous spaces to form a user terminal group;

[0078] The base station 100 performs downlink data transmission to the user terminal group.

[0079] It should be pointed out that the discontinuous space refers to the antenna network coverage space that is independent of each other and has spatial separation. For example, the space of each office in an office building is the discontinuous space described in this application, the space of each ward in a hospital is the discontinuous space described in this application, and the space of each room in a hotel is the discontinuous space described in this application.

[0080] The base station 100 can have various forms. Considering that the base station 100 needs to provide network coverage for discontinuous spaces, the base station 100 described in the present application usually adopts an indoor baseband processing unit (Base band Unite, BBU) connected to multiple antennas through coaxial cable or optical fiber in actual application scenarios, thereby providing wireless signal coverage for each discontinuous space, allowing terminal devices in the discontinuous space to access the network and transmit data.

[0081] The physical antenna element 11 is a component on the antenna, which has the function of guiding and amplifying electromagnetic waves, so that the electromagnetic signal received by the terminal is stronger. In other words, the deployment mode of the physical antenna element 11 determines the network coverage space.

[0082] It will be understood by those skilled in the art that 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 the network coverage space. Specifically, different physical channels and physical signals use different logical port numbers. For example, the logical port number of PDCCH is 2000, the logical port number of SSB is 4000, and the logical port number of PDSCH 14 is 1000-1012. The mapping method from the logical port number to the physical antenna is determined by the device implementation. The typical mapping method is to correspond the logical port to the physical antenna element 11 (antenna element) or antenna subarray one by one.

[0083] In a typical mapping method, only the PDSCH channel in the downlink channel is precoded. The precoding process maps the PDSCH data to the channel state information reference signal port (CSI-RS) through the demodulation reference signal port (DMRS). Multiple CSI-RS ports are mapped one by one to physical antennas, thereby mapping the PDSCH logical port 14 to multiple physical antenna elements 11, so that the PDSCH data can be mapped to multiple physical antennas for transmission. Since other downlink channels are not precoded, in a typical mapping method, the SSB logical port 12 and the PDCCH logical port 13 are only mapped to a single physical antenna.

[0084] 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 method, the PDSCH logical port 14 will be mapped to the first physical antenna to the fourth physical antenna, while the PDCCH logical port 13 and the SSB logical port 12 are only mapped to the first physical antenna. It can be seen intuitively that the first physical antenna to the fourth physical antenna can send 4-stream PDSCH data, while only the first physical antenna can send PDCCH data and SSB data.

[0085] To reduce antenna deployment costs, each antenna of the base station 100 described in the present application may be provided with a single antenna element 11. Therefore, the N antennas of the base station 100 described in the present application correspond to N physical antenna elements 11.

[0086] In the case where each antenna of the base station 100 is only provided with a single antenna element 11, each antenna can only transmit single-stream data of the BBU baseband data. In this case, if a typical mapping method is adopted, only the terminal in the space covered by one of the antennas can receive SSB data, PDCCH data and single-stream PDSCH data, and the terminals in the space covered by other antennas cannot receive SSB data and PDCCH data. Therefore, the base station 100 cannot simultaneously perform downlink data transmission for the terminals located in the discontinuous space, resulting in a technical problem of low downlink data transmission efficiency of the base station 100.

[0087] To this end, the base station 100 provided in the present application is configured according to the first physical resource mapping strategy, and maps the SSB logical port 12, PDCCH logical port 13, and PDSCH logical port 14 to the N physical antenna elements 11, so that the M discontinuous spaces covered by the N antenna networks can all perform downlink data transmission.

[0088] Specifically, the first physical resource mapping strategy includes at least a unit array configuration item and a unit vector configuration item;

[0089] The unit array configuration item is used to respectively establish a mapping relationship between the SSB logical port 12, the PDCCH logical port 13, the PDSCH logical port 14 and one physical antenna element 11 selected from the N physical antenna elements 11;

[0090] The unit vector configuration item is used to establish a mapping relationship between the SSB logical port 12, the PDCCH logical port 13 and the M discontinuous spaces through each of the N physical antenna elements 11.

[0091] Among them, the first physical resource mapping strategy is manifested 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, PDCCH data, and PDSCH data are sequentially placed in the resource grid corresponding to the antenna port, so that the M discontinuous spaces covered by the N antenna network can all perform downlink data transmission.

[0092] It should be pointed out that there is a corresponding relationship between the N physical antenna elements 11 mentioned here and the M discontinuous spaces. This is because a single discontinuous space can be defined by the network coverage space of a single physical antenna element 11, or by the network coverage space of multiple physical antenna elements 11. Therefore, the number M of discontinuous spaces must not be greater than the number N of physical antenna elements 11 set in the base station 100. In other words, there will only be a situation where N=M or N>M. Here, N=M or N>M is the corresponding relationship between N physical antenna elements 11 and M discontinuous spaces.

[0093] In the case of 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 send single-stream PDSCH data, and cannot send 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 100 can determine the space where the user terminal is located when receiving the location attribute of the user terminal;

[0094] The base station 100 schedules the user terminals in the M discontinuous spaces to form a user terminal group;

[0095] The base station 100 is configured according to the first physical resource mapping strategy to separate M PDSCH data streams to form downlink M stream transmission;

[0096] The base station 100 performs downlink data transmission to the user terminal group.

[0097] It should be noted that the process of the base station 100 receiving the location attribute of the user terminal is as follows:

[0098] After the user terminal completes the random access process and enters the RRC connection state, the base station 100 refers to the physical uplink shared channel (PUSCH), channel sensing reference signal (SRS) or channel quality information report (CSI Report) sent by the receiving terminal, and the base station 100 can obtain the location attribute of the user terminal from the PUSCH data, SRS data or PRACH data sent by the user terminal. When the user terminal moves, the base station 100 re-acquires the location attribute of the user terminal according to the received uplink data to determine a new first physical resource mapping strategy.

[0099] Further, in a specific implementation provided in the present application, when N=M, the unit array configuration item includes a unit matrix with an order equal to N;

[0100] The unit vector configuration item consists of a vector of all 1s that sets the scaling factor.

[0101] It can be understood that the elements on the diagonal from the upper left corner to the lower right corner of the unit matrix with an order equal to N are all 1, and all other elements are 0. Among them, since the order is equal to N, the number of rows and columns of the unit matrix corresponds to the number of 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.

[0102] On the basis of the unit array configuration item as a precoding codebook that establishes a mapping relationship between the SSB logical port 12, the PDCCH logical port 13, and the PDSCH logical port 14 and the N physical antenna elements 11, each column of the unit array represents a precoding codeword, and the precoding codeword is indexed by column numbers 1 to 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 the M discontinuous spaces can all correctly receive PDSCH data.

[0103] It should also be emphasized that since the elements on the diagonal from the upper left corner to the lower right corner of the unit matrix are all 1, and all other elements are 0, there will be no interference in precoding when mapping the PDSCH logical port 14 to the N physical antenna elements 11, thereby making the quality of the PDSCH data sent in the M discontinuous spaces better. In addition, the N antennas are located in M ​​discontinuous spaces. Since N=M, even if the unit array configuration item is expressed as a codeword containing more "1" (for example, an all-1 vector), the terminal can only receive downlink data sent by a single antenna in the space. It can be seen that using one of the codewords of the unit matrix is ​​more reasonable than the all-1 vector codeword.

[0104] For SSB data and PDCCH data, the base station 100 uses a unit vector configuration item to map the SSB logical port 12 and the PDCCH logical port 13 of the single antenna port to N physical antenna elements 11 by setting the all-1 vector of the scaling factor, so that terminals in M ​​discontinuous spaces can receive SSB data and PDCCH data. The scaling factor is a factor that keeps the total transmission energy unchanged.

[0105] Further, in a specific implementation manner provided in the present application, any column of the unit array configuration item or the unit vector configuration item represents a codeword;

[0106] The first physical resource mapping strategy W N,M Also includes the column number index w for codeword numbering k ;

[0107] When the four antenna networks of the base station 100 cover four discontinuous spaces, the first physical resource mapping strategy W 4,4 It manifests as:

[0108]

[0109] Among them, W 4,4 It indicates that the first physical resource mapping strategy is applied to a base station 100 with four antenna networks covering four discontinuous spaces;

[0110] And W 4,4 Indicates that the first physical resource mapping strategy satisfies N=M,

[0111] The first physical resource mapping strategy W 4,4The codewords in columns w1 to w4 constitute unit array configuration items, which are expressed as unit matrices with an order of 4, and are used to establish mapping relationships between the PDSCH logical port 14 and the four physical antenna elements 11 respectively; the codewords in column w5 constitute unit vector configuration items, which are expressed as all-1 vectors with a scaling factor of 1 / 2, and are used to establish mapping relationships between the SSB logical port 12 and the PDCCH logical port 13 and the four physical antenna elements 11, so that terminals in four discontinuous spaces can receive SSB data or PDCCH data.

[0112] 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 transmit energy is 1 / 4 of the original data, the total transmit energy of the four antennas is 1, and the scaling factor that keeps the total transmit energy of the base station unchanged is 1 / 2.

[0113] Please refer to Figure 2 In this specific implementation, the base station 100 includes four physical antenna elements 11. The base station 100 uses four physical antenna elements 11 to cover four independent areas. In this application scenario, the first physical resource mapping strategy is used. 4,4 Indicates that, and due to the first physical resource mapping strategy W 4,4 Satisfying N=M, the first physical resource mapping strategy W 4,4 It includes a unit array configuration item and a unit vector configuration item. The unit array configuration item includes a unit matrix with an order equal to N; the unit vector configuration item includes an all-1 vector for setting a scaling factor. Of course, the first physical resource mapping strategy W N,M Also includes the column number index w for codeword numbering k .

[0114] Specifically, the first physical resource mapping strategy W 4,4 It manifests as:

[0115]

[0116] Among them, the codewords in columns w1 to w4 constitute a unit array configuration item, which is expressed as a unit matrix with an order equal to 4, and is used to establish a mapping relationship between the PDSCH logical port 14 and the four physical antenna elements 11. The codewords in column w5 constitute a unit vector configuration item, which is expressed as an all-1 vector with a scaling factor of 1 / 2, and is used to establish a mapping relationship between the SSB logical port 12 and the PDCCH logical port 13 and the four physical antenna elements 11, so that the terminals in the four discontinuous spaces can receive SSB data or PDCCH data.

[0117] Because the four physical antenna elements 11 are located in four independent discontinuous spaces, the four discontinuous spaces are independent of each other and have natural spatial isolation, which results in there being only one downlink antenna in the space where any terminal is located. A single physical antenna element 11 can only send single-stream PDSCH data, and cannot send multi-stream PDSCH data, which is determined by the physical characteristics of wireless transmission. The base station 100 can determine the space where the user terminal is located when receiving the location attribute of the user terminal; the base station 100 schedules the user terminals in the four discontinuous spaces to form a user terminal group; the base station 100 is configured according to the first physical resource mapping strategy to separate the four PDSCH data streams to form a downlink four-stream transmission; the base station 100 performs downlink data transmission to the user terminal group.

[0118] Of course, in actual application scenarios, in addition to the case where the network coverage space of a single physical antenna element 11 defines a single discontinuous space, there is also a case where the network coverage space of multiple physical antenna elements 11 defines a single discontinuous space, that is, N>M.

[0119] The following describes an implementation process of the base station 100 performing downlink data transmission to the user terminal group when the network coverage space of multiple physical antenna elements 11 defines a single discontinuous space.

[0120] Further, in a specific implementation provided in the present application, when N>M, the unit array configuration item includes a unit matrix with an order equal to N;

[0121] The unit vector configuration item includes at least an all-ones vector that sets the scaling factor;

[0122] The first physical resource mapping strategy also includes a precoding enhancement matrix for enhancing the mapping relationship between the PDSCH logical port 14 and the M discontinuous spaces;

[0123] The precoding enhancement matrix at least includes a single-stream precoding matrix corresponding to single-stream transmission in the discontinuous space where the user terminal is located, and a multi-stream precoding matrix corresponding to multi-stream transmission in the discontinuous space where the user terminal is located.

[0124] It can be understood that the elements on the diagonal from the upper left corner to the lower right corner of the unit matrix with the order equal to N are all 1, and the other elements are all 0. Among them, because the order is equal to N, the number of rows and columns of the unit matrix corresponds to the number of physical antenna elements 11.

[0125] On the basis of the unit array configuration item as a precoding codebook that establishes a mapping relationship between the SSB logical port 12, the PDCCH logical port 13, and the PDSCH logical port 14 and the N physical antenna elements 11, each column of the unit array represents a precoding codeword, and the precoding codeword is indexed by column numbers 1 to 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 the M discontinuous spaces can all correctly receive PDSCH data.

[0126] It should also be emphasized that since the elements on the diagonal of the unit matrix from the upper left corner to the lower right corner are all 1, and all other elements are 0, this makes it possible to map the PDSCH logical port 14 to N physical antenna elements 11 without causing interference in precoding, thereby making the quality of the PDSCH data sent down in the M discontinuous spaces better.

[0127] For SSB data and PDCCH data, the base station 100 uses a unit vector configuration item to map the SSB logical port 12 and the PDCCH logical port 13 of the single antenna port to N physical antenna elements 11 by setting the all-1 vector of the scaling factor, so that terminals in M ​​discontinuous spaces can receive SSB data and PDCCH data. The scaling factor is a factor that keeps the total transmission energy unchanged.

[0128] In addition, the first physical resource mapping strategy also includes a precoding enhancement matrix for enhancing the mapping relationship between the PDSCH logical port 14 and the M discontinuous spaces. The precoding enhancement matrix includes at least a single-stream precoding matrix corresponding to the single-stream transmission of the discontinuous space where the user terminal is located, and a multi-stream precoding matrix corresponding to the multi-stream transmission of the discontinuous space where the user terminal is located.

[0129] Specifically, when the base station 100 schedules the terminal to perform PDSCH single-stream reception, a codeword can be selected from the single-stream precoding matrix to establish a mapping relationship between the PDSCH logical port 14 and any one of the N physical antenna elements 11 to enhance the mapping relationship between the PDSCH logical port 14 and the antenna element 11.

[0130] When the base station 100 schedules the terminal to perform downlink multi-stream reception, the number of PDSCH streams is determined, which is recorded as the first number; codewords corresponding to the first number are selected from the multi-stream precoding matrix, and a mapping relationship is established 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.

[0131] Taking the case where the base station 100 schedules the terminal to receive PDSCH 2 streams as an example, 2 codewords are selected from the codebook; the PDSCH 2 stream data is precoded using the 2 codewords and mapped to 2 antennas in the space where the terminal is located for transmission.

[0132] Further, in a specific implementation manner 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;

[0133] The first physical resource mapping strategy W N,M Also includes the column number index w for codeword numbering k ;

[0134] When the four antenna networks of the base station 100 cover two discontinuous spaces, the first physical resource mapping strategy W 4,2 It manifests as:

[0135]

[0136] Among them, W 4,2 It indicates that the first physical resource mapping strategy is applied to the base station 100 with 4 antenna networks covering 2 discontinuous spaces;

[0137] And W 4,2 Indicates that the first physical resource mapping strategy satisfies N>M,

[0138] The first physical resource mapping strategy W 4,2 The first four columns of codewords are unit array configuration items, which are expressed as unit matrices with an order of 4, and are used to establish a mapping relationship between the PDSCH logical port 14 and the four physical antenna elements 11 respectively; the fifth column of codewords is a unit vector configuration item, which is expressed as an all-1 vector with a scaling factor of 1 / 2, and is used to establish a mapping relationship between the SSB logical port 12 and the PDCCH logical port 13 and the four physical antenna elements 11, so that terminals in two discontinuous spaces can receive SSB data or PDCCH data; the sixth to thirteenth columns of codewords are single-stream precoding matrices corresponding to single-stream transmission in the discontinuous space where the user terminal is located; the fourteenth to 21st columns of codewords are multi-stream precoding matrices corresponding to multi-stream transmission in the discontinuous space where the user terminal is located.

[0139] Please refer to Figure 3 In this specific implementation, the base station 100 includes four physical antenna elements 11. The base station 100 uses four physical antenna elements 11 to cover two independent areas. In this application scenario, the first physical resource mapping strategy is used. 4,2 Indicates that, and due to the first physical resource mapping strategy W 4,2 Satisfying N>M, the first physical resource mapping strategy W 4,2It includes a unit array configuration item, a unit vector configuration item and a precoding enhancement matrix. Among them, the unit array configuration item includes a unit matrix with an order equal to N; the unit vector configuration item includes a full 1 vector for setting a scaling factor, and the precoding enhancement matrix includes a single-stream precoding matrix and a multi-stream precoding matrix. Of course, the first physical resource mapping strategy W N,M Also includes the column number index w for codeword numbering k .

[0140] Specifically, the first physical resource mapping strategy W 4,2 It manifests as:

[0141]

[0142] The codewords in columns w1 to w4 constitute unit array configuration items, which are expressed as unit matrices with an order of 4, and are used to establish mapping relationships between the PDSCH logical port 14 and the four physical antenna elements 11. The codewords in columns w5 constitute unit vector configuration items, which are expressed as all-1 vectors with a scaling factor of 1 / 2, and are used to establish mapping relationships between the SSB logical port 12 and the PDCCH logical port 13 and the four physical antenna elements 11, so that terminals in two discontinuous spaces can receive SSB data or PDCCH data. 13 The codewords in the columns constitute a single-stream precoding matrix, which is used to map multi-stream PDSCH data to two physical antenna elements in the space where the terminal is located when the base station 100 schedules the terminal to perform single-stream PDSCH reception, so as to improve the signal quality of the multi-stream PDSCH. 14 tow 21 The codewords in the columns constitute a multi-stream precoding matrix, which is used to map the multi-stream PDSCH data to two physical antenna elements in the 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.

[0143] The number of antennas in any discontinuous space corresponds to the number of non-zero digits in the codeword in the precoding enhancement matrix. For example, if the first discontinuous space contains the first antenna and the second antenna, the first two digits of the codeword w6 are not zero, corresponding to the two antennas in the first discontinuous space; the last two digits are zero, corresponding to the two antennas in another space.

[0144] Specifically, when the base station 100 schedules the terminal located in the first discontinuous space to perform PDSCH single-stream reception, the base station 100 can select a codeword from the codewords in columns w6 to w9 to enhance the mapping relationship between the PDSCH logical port 14 and any physical antenna element 11 corresponding to the first discontinuous space.

[0145] When the base station 100 schedules the terminal located in the second discontinuous space to receive a single stream of the PDSCH, the base station 100 can receive the single stream of the PDSCH from w10 tow 13 A codeword is selected from the codewords in the column to enhance the mapping relationship between the PDSCH logical port 14 and any physical antenna element 11 corresponding to the second discontinuous space.

[0146] When the base station 100 schedules the terminal located in the first discontinuous space to perform PDSCH dual-stream reception, the base station 100 can receive the PDSCH dual-stream from w 14 tow 17 Two codewords are selected from the codewords in the column to enhance the mapping relationship between the PDSCH logical port 14 and the two physical antenna elements 11 corresponding to the first discontinuous space.

[0147] When the base station 100 schedules the terminal located in the second discontinuous space to perform PDSCH dual-stream reception, the base station 100 can receive the PDSCH dual-stream from w 18 tow 21 Two codewords are selected from the codewords in the column to enhance the mapping relationship between the PDSCH logical port 14 and the two physical antenna elements 11 corresponding to the second discontinuous space.

[0148] Because the four physical antenna elements 11 are located in two independent discontinuous spaces, the two discontinuous spaces are independent of each other and have natural spatial isolation, which results in two downlink antennas in the space where any terminal is located. A single discontinuous space can only send two-stream PDSCH data, and cannot send four-stream PDSCH data, which is determined by the physical characteristics of wireless transmission. The base station 100 can determine the space where the user terminal is located when receiving the location attribute of the user terminal; the base station 100 schedules two user terminals in a single discontinuous space to form a user terminal group; the base station 100 schedules two user terminals in the single discontinuous space to form a user terminal group according to the first physical resource mapping strategy W 4,2 To configure, from w 14 tow 21 The base station 100 selects a suitable codeword from the codewords in the column to separate four PDSCH data streams and sends them to two UEs to form a downlink four-stream transmission; the base station 100 performs downlink data transmission to the user terminal group.

[0149] In summary, the present application provides a base station 100 that uses N antenna networks to cover M discontinuous spaces, according to the first physical resource mapping strategy w ,M The configuration is performed so that any terminal within the coverage of the physical antenna can receive SSB data and PDCCH data, and any terminal within the coverage of the physical antenna can access the network and transmit data, thereby improving the downlink data transmission efficiency of the base station 100. The N physical antenna elements 11 correspond to the M discontinuous spaces, and the first physical resource mapping strategy W N,MThere are various forms of expression as the correspondence between the N physical antenna elements 11 and the M discontinuous spaces is different. In the case where the coverage ranges of the multiple physical antenna elements 11 define a single discontinuous space, the first physical resource mapping strategy W N,M The mapping relationship between the PDSCH logical port 14 and the discontinuous space corresponding physical antenna element 11 is also enhanced, thereby improving the spectrum utilization rate.

[0150] It should also be emphasized that the base station 100 provided in this application is different from an indoor distributed base station system. Indoor distributed base station systems usually use multiple low-power antennas to provide overall coverage. These physical antennas are only connected by coaxial cables, power dividers, and couplers. The downlink data sent by multiple antennas are exactly the same. The base station cannot distinguish the coverage areas of different antennas, and cannot use the location information of the terminal for scheduling optimization. However, this solution supports the base station 100 to distinguish the coverage areas of different antennas, and can use the location information of the terminal for scheduling optimization, realize downlink multi-stream transmission, and improve spectrum utilization. In addition, this solution does not require hardware updates, and can be implemented only by software upgrades, which expands the versatility of small base stations or indoor base stations.

[0151] Please refer to Figure 4 In order to support the base station 100 provided in the present application that uses N antenna networks to cover M discontinuous spaces, the present application also provides a downlink data transmission method to cooperate with the base station 100 provided in the present application to perform the following steps:

[0152] S110: When the base station receives the location attribute of the user terminal, it determines the space where the user terminal is located.

[0153] S120: The base station schedules the M user terminals in the space to form a user terminal group.

[0154] S130: 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 perform downlink data transmission to the user terminal group.

[0155] The process of the base station receiving the location attribute of the user terminal is as follows:

[0156] After the user terminal completes the random access process and enters the RRC connected state, the base station refers to the physical uplink shared channel (PUSCH), channel sensing reference signal (SRS) or channel quality information report (CSI Report) sent by the receiving terminal. The base station can obtain the location attributes of the user terminal from the PUSCH data, SRS data or PRACH data sent by the user terminal.

[0157] The location attribute of the user terminal corresponds to the discontinuous space where the user terminal is located. The discontinuous space refers to the antenna network coverage space that is independent of each other and has a spatial separation. For example, the space of each office in an office building is the discontinuous space described in this application, the space of each ward in a hospital is the discontinuous space described in this application, and the space of each room in a hotel is the discontinuous space described in this application.

[0158] The division of discontinuous space is related to the physical antenna elements of the base station, and the deployment method of the physical antenna elements determines the network coverage space. Considering that the base station needs to provide network coverage for discontinuous spaces, the base station described in this application usually uses an indoor baseband processing unit (Base band Unite, BBU) in the actual application scenario to connect to multiple antennas through coaxial cables or optical fibers, thereby providing wireless signal coverage for each discontinuous space. In a typical mapping method, only the PDSCH channel in the downlink channel is pre-coded, and the pre-coding process maps the PDSCH data to the channel state information reference signal port (Channelstate information-Reference Signal, CSI-RS) through the demodulation reference signal port (Demodulation Reference Signal, DMRS), and multiple CSI-RS ports are mapped one by one to the physical antenna, thereby realizing the mapping of the PDSCH logical port to multiple physical antenna elements, so that the PDSCH data can be mapped to multiple physical antennas for transmission. Since other downlink channels are not pre-coded, in a typical mapping method, the SSB logical port and the PDCCH logical port are only mapped to a single physical antenna.

[0159] To reduce antenna deployment costs, each antenna of the base station described in the present application may be provided with a single antenna element. Therefore, the N antennas of the base station described in the present application correspond to N physical antenna elements.

[0160] In the case where each antenna of the base station is only provided with a single antenna vibrator, each antenna can only transmit single-stream data of BBU baseband data. In this case, if a typical mapping method is adopted, only the terminal in the space covered by one of the antennas can receive SSB data, PDCCH data and single-stream PDSCH data, and the terminals in the space covered by other antennas cannot receive SSB data and PDCCH data. Therefore, there will be a technical problem that the base station cannot simultaneously perform downlink data transmission for the terminals located in the discontinuous space, resulting in low downlink data transmission efficiency of the base station.

[0161] To this end, the base station provided in the present application is configured according to the first physical resource mapping strategy, and maps the SSB logical port, PDCCH logical port, and PDSCH logical port to the N physical antenna elements, so that the M discontinuous spaces covered by the N antenna networks can all perform downlink data transmission.

[0162] Specifically, the first physical resource mapping strategy includes at least a unit array configuration item and a unit vector configuration item;

[0163] The unit array configuration item is used to establish a mapping relationship between an SSB logical port, a PDCCH logical port, a PDSCH logical port and one physical antenna element among N physical antenna elements;

[0164] The unit vector configuration item is used to establish a mapping relationship between the SSB logical port, the PDCCH logical port and the M discontinuous spaces through each of the N physical antenna elements.

[0165] Among them, the first physical resource mapping strategy is manifested as a precoding codebook in a specific application scenario. In the process of physical resource mapping, the base station configures appropriate precoding codewords for the SSB channel and the PDCCH channel according to the correspondence between the N physical antenna elements and the M discontinuous spaces, so that the SSB logical port and the PDCCH logical port can be mapped to multiple physical antennas, and the SSB data, PDCCH data, and PDSCH data are placed in the resource grid corresponding to the antenna port in sequence, so that the M discontinuous spaces covered by the N antenna network can all perform downlink data transmission.

[0166] It should be pointed out that there is a corresponding relationship between the N physical antenna elements mentioned here and the M discontinuous spaces. This is because a single discontinuous space can be defined by the network coverage space of a single physical antenna element or by the network coverage space of multiple physical antenna elements. Therefore, the number M of discontinuous spaces must not be greater than the number N of physical antenna elements set by the base station. In other words, there will only be a situation where N=M or N>M. Here, N=M or N>M is the corresponding relationship between N physical antenna elements and M discontinuous spaces.

[0167] In the case of 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 send single-stream PDSCH data, and cannot send 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 attributes of the user terminal;

[0168] The base station schedules the M user terminals in the discontinuous spaces to form a user terminal group;

[0169] The base station is configured according to the first physical resource mapping strategy to separate M PDSCH data streams to form downlink M stream transmission;

[0170] The base station performs downlink data transmission to the user terminal group.

[0171] Further, in a specific implementation provided in the present application, when N=M, the unit array configuration item includes a unit matrix with an order equal to N;

[0172] The unit vector configuration item consists of a vector of all 1s that sets the scaling factor.

[0173] It can be understood that the elements on the diagonal from the upper left corner to the lower right corner of the unit matrix with an order equal to N are all 1, and all other elements are 0. Among them, since the order is equal to N, the number of rows and columns of the unit matrix corresponds to the number of physical antenna elements. Since N=M, the number of rows and columns of the unit matrix is ​​M, corresponding to the number of discontinuous spaces.

[0174] On the basis of the unit array configuration item as a precoding codebook that establishes a mapping relationship between the SSB logical port, the PDCCH logical port, the PDSCH logical port and the N physical antenna elements, each column of the unit array represents a precoding codeword, and the precoding codeword is indexed by column numbers 1 to N. Specifically, a single precoding codeword is responsible for mapping the PDSCH logical port to a single physical antenna element, so that the terminals in the M discontinuous spaces can correctly receive the PDSCH data.

[0175] It should also be emphasized that since the elements on the diagonal from the upper left corner to the lower right corner of the unit matrix are all 1, and all other elements are 0, this makes it possible to map the PDSCH logical port to N physical antenna elements without interference in precoding, thereby making the quality of the PDSCH data sent in M ​​discontinuous spaces better. In addition, N antennas are located in M ​​discontinuous spaces. Since N = M, even if the unit array configuration item is expressed as a codeword containing more "1" (for example, an all-1 vector), the terminal can only receive downlink data sent by a single antenna in the space. It can be seen that using one of the codewords of the unit matrix is ​​more reasonable than the all-1 vector codeword.

[0176] For SSB data and PDCCH data, the base station uses a unit vector configuration item to map the SSB logical port and PDCCH logical port of a single antenna port to N physical antenna elements by setting a full 1 vector of a scaling factor, so that terminals in M ​​discontinuous spaces can receive SSB data and PDCCH data. The scaling factor is a factor that keeps the total transmission energy unchanged.

[0177] Further, in a specific implementation manner provided in the present application, any column of the unit array configuration item or the unit vector configuration item represents a codeword;

[0178] The first physical resource mapping strategy W N,M Also includes the column number index w for codeword numbering k ;

[0179] When the four antenna networks of the base station cover four discontinuous spaces, the first physical resource mapping strategy W 4,4 It manifests as:

[0180]

[0181] Among them, W 4,4 Indicates that the first physical resource mapping strategy is applied to a base station with four antenna networks covering four discontinuous spaces;

[0182] And W 4,4 Indicates that the first physical resource mapping strategy satisfies N=M,

[0183] The first physical resource mapping strategy W 4,4 The codewords in columns w1 to w4 constitute unit array configuration items, which are expressed as unit matrices with an order of 4, and are used to establish mapping relationships between the PDSCH logical ports and the four physical antenna elements respectively; the codewords in column w5 constitute unit vector configuration items, which are expressed as all-1 vectors with a scaling factor of 1 / 2, and are used to establish mapping relationships between the SSB logical port and the PDCCH logical port and the four physical antenna elements, so that terminals in four discontinuous spaces can receive SSB data or PDCCH data.

[0184] 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 transmit energy is 1 / 4 of the original data, the total transmit energy of the four antennas is 1, and the scaling factor that keeps the total transmit energy of the base station unchanged is 1 / 2.

[0185] In this specific implementation, the base station includes four physical antenna elements. The base station uses four physical antenna elements to cover four independent areas. In this application scenario, the first physical resource mapping strategy is used. 4,4 Indicates that, and due to the first physical resource mapping strategy W 4,4 Satisfying N=M, the first physical resource mapping strategy

[0186] W 4,4 It includes a unit array configuration item and a unit vector configuration item. The unit array configuration item includes a unit matrix with an order equal to N; the unit vector configuration item includes an all-1 vector for setting a scaling factor. Of course, the first physical resource mapping strategy WN,M Also includes the column number index w for codeword numbering k .

[0187] Specifically, the first physical resource mapping strategy W 4,4 It manifests as:

[0188]

[0189] Among them, the codewords in columns w1 to w4 constitute unit array configuration items, which are expressed as unit matrices with an order of 4, and are used to establish mapping relationships between PDSCH logical ports and four physical antenna elements. The codewords in column w5 constitute unit vector configuration items, which are expressed as all-1 vectors with a scaling factor of 1 / 2, and are used to establish mapping relationships between SSB logical ports and PDCCH logical ports and four physical antenna elements, so that terminals in four discontinuous spaces can receive SSB data or PDCCH data.

[0190] Because the four physical antenna elements are located in four independent discontinuous spaces, the four discontinuous spaces are independent of each other and have natural spatial isolation, which results in there being only one downlink antenna in the space where any terminal is located. A single physical antenna element can only send single-stream PDSCH data, and cannot send multi-stream PDSCH data, which is determined by the physical characteristics of wireless transmission. 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 schedules the user terminals in the four discontinuous spaces to form a user terminal group; the base station is configured according to the first physical resource mapping strategy to separate the four PDSCH data streams to form a downlink four-stream transmission; the base station performs downlink data transmission to the user terminal group.

[0191] Of course, in actual application scenarios, in addition to 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 space of multiple physical antenna elements defines a single discontinuous space, that is, N>M.

[0192] The following describes an implementation process of the base station performing downlink data transmission to the user terminal group when the network coverage space of multiple physical antenna elements defines a single discontinuous space.

[0193] Further, in a specific implementation provided in the present application, when N>M, the unit array configuration item includes a unit matrix with an order equal to N;

[0194] The unit vector configuration item includes at least an all-ones vector that sets the scaling factor;

[0195] The first physical resource mapping strategy also includes a precoding enhancement matrix for enhancing the mapping relationship between the PDSCH logical port and the M discontinuous spaces;

[0196] The precoding enhancement matrix at least includes a single-stream precoding matrix corresponding to single-stream transmission in the discontinuous space where the user terminal is located, and a multi-stream precoding matrix corresponding to multi-stream transmission in the discontinuous space where the user terminal is located.

[0197] It can be understood that the elements on the diagonal from the upper left corner to the lower right corner of the unit matrix with an order equal to N are all 1, and all other elements are 0. Among them, since the order is equal to N, the number of rows and columns of the unit matrix corresponds to the number of physical antenna elements.

[0198] On the basis of the unit array configuration item as a precoding codebook that establishes a mapping relationship between the SSB logical port, the PDCCH logical port, the PDSCH logical port and the N physical antenna elements, each column of the unit array represents a precoding codeword, and the precoding codeword is indexed by column numbers 1 to N. Specifically, a single precoding codeword is responsible for mapping the PDSCH logical port to a single physical antenna element, so that the terminals in the M discontinuous spaces can correctly receive the PDSCH data.

[0199] It should also be emphasized that since the elements on the diagonal of the unit matrix from the upper left corner to the lower right corner are all 1, and all other elements are 0, this makes it possible to map the PDSCH logical port to N physical antenna elements without causing interference in precoding, thereby making the quality of the PDSCH data sent in the M discontinuous spaces better.

[0200] For SSB data and PDCCH data, the base station uses a unit vector configuration item to map the SSB logical port and PDCCH logical port of a single antenna port to N physical antenna elements by setting a full 1 vector of a scaling factor, so that terminals in M ​​discontinuous spaces can receive SSB data and PDCCH data. The scaling factor is a factor that keeps the total transmission energy unchanged.

[0201] In addition, the first physical resource mapping strategy also includes a precoding enhancement matrix for enhancing the mapping relationship between the PDSCH logical port and the M discontinuous spaces. The precoding enhancement matrix includes at least a single-stream precoding matrix corresponding to the single-stream transmission of the discontinuous space where the user terminal is located, and a multi-stream precoding matrix corresponding to the multi-stream transmission of the discontinuous space where the user terminal is located.

[0202] Specifically, when the base station schedules the terminal to perform PDSCH single-stream reception, a codeword can be selected from the single-stream precoding matrix to establish a mapping relationship between the PDSCH logical port and any one of the N physical antenna elements to enhance the mapping relationship between the PDSCH logical port and the antenna element.

[0203] When the base station schedules the terminal to perform downlink multi-stream reception, the number of PDSCH streams is determined and recorded as the first number; codewords corresponding to the first number are selected from the multi-stream precoding matrix, and a mapping relationship is established between the PDSCH logical ports and the physical antenna elements corresponding to the discontinuous space where the user terminal is located, so as to enhance the mapping relationship between the PDSCH logical ports and the physical antenna elements corresponding to the discontinuous space.

[0204] Taking the case where the base station 100 schedules the terminal to receive PDSCH 2 streams as an example, 2 codewords are selected from the codebook; the PDSCH 2 stream data is precoded using the 2 codewords and mapped to 2 antennas in the space where the terminal is located for transmission.

[0205] Further, in a specific implementation manner 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;

[0206] The first physical resource mapping strategy W N,M Also includes the column number index w for codeword numbering k ;

[0207] When the four antenna networks of the base station cover two discontinuous spaces, the first physical resource mapping strategy W 4,2 It manifests as:

[0208]

[0209] Among them, W 4,2 Indicates that the first physical resource mapping strategy is applied to a base station with four antenna networks covering two discontinuous spaces;

[0210] And W 4,2 Indicates that the first physical resource mapping strategy satisfies N>M,

[0211] The first physical resource mapping strategy W 4,2 The first four columns of codewords are unit array configuration items, expressed as unit matrices with an order of 4, which are used to establish a mapping relationship between the PDSCH logical port and the four physical antenna elements respectively; the fifth column of codewords is a unit vector configuration item, expressed as an all-1 vector with a scaling factor of 1 / 2, which is used to establish a mapping relationship between the SSB logical port and the PDCCH logical port and the four physical antenna elements, so that terminals in two discontinuous spaces can receive SSB data or PDCCH data; the sixth to thirteenth columns of codewords are single-stream precoding matrices corresponding to single-stream transmission in the discontinuous space where the user terminal is located; the fourteenth to 21st columns of codewords are multi-stream precoding matrices corresponding to multi-stream transmission in the discontinuous space where the user terminal is located.

[0212] In this specific implementation, the base station includes four physical antenna elements. The base station uses four physical antenna elements to cover two independent areas. In this application scenario, the first physical resource mapping strategy is used. 4,2 Indicates that, and due to the first physical resource mapping strategy W 4,2 Satisfying N>M, the first physical resource mapping strategy W 4,2 It includes a unit array configuration item, a unit vector configuration item and a precoding enhancement matrix. Among them, the unit array configuration item includes a unit matrix with an order equal to N; the unit vector configuration item includes a full 1 vector for setting a scaling factor, and the precoding enhancement matrix includes a single-stream precoding matrix and a multi-stream precoding matrix. Of course, the first physical resource mapping strategy W N,M Also includes the column number index w for codeword numbering k .

[0213] Specifically, the first physical resource mapping strategy W 4,2 It manifests as:

[0214]

[0215] Among them, the codewords in columns w1 to w4 constitute unit array configuration items, which are expressed as unit matrices with an order of 4, and are used to establish mapping relationships between PDSCH logical ports and four physical antenna elements. The codewords in columns w5 constitute unit vector configuration items, which are expressed as all-1 vectors with a scaling factor of 1 / 2, and are used to establish mapping relationships between SSB logical ports and PDCCH logical ports and four physical antenna elements, so that terminals in two discontinuous spaces can receive SSB data or PDCCH data. 13 The codewords in the columns constitute a single-stream precoding matrix, which is used to map the single-stream PDSCH data to the two physical antenna arrays in the space where the terminal is located when the base station schedules the terminal to receive the single-stream PDSCH, so as to improve the signal quality of the single-stream PDSCH. 14 tow 21 The codewords in the columns constitute a multi-stream precoding matrix, which is used to map 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 signal quality of the multi-stream PDSCH.

[0216] The number of antennas in any discontinuous space corresponds to the number of non-zero digits in the codeword in the precoding enhancement matrix. For example, if the first discontinuous space contains the first antenna and the second antenna, the first two digits of the codeword w6 are not zero, corresponding to the two antennas in the first discontinuous space; the last two digits are zero, corresponding to the two antennas in another space.

[0217] Specifically, when the base station schedules the terminal located in the first discontinuous space to perform PDSCH single-stream reception, the base station may select a codeword from the codewords in columns w6 to w9 to enhance the mapping relationship between the PDSCH logical port and the physical antenna element corresponding to the first discontinuous space.

[0218] When the base station schedules the terminal located in the second discontinuous space to receive a single stream of PDSCH, the base station can 10 tow 13 A codeword is selected from the codewords in the column to enhance the mapping relationship between the PDSCH logical port and the physical antenna element corresponding to the second discontinuous space.

[0219] When the base station schedules the terminal located in the first discontinuous space to perform PDSCH dual-stream reception, the base station can 14 tow 17 Two codewords are selected from the codewords in the column to enhance the mapping relationship between the PDSCH logical port and the physical antenna element corresponding to the first discontinuous space.

[0220] When the base station schedules the terminal located in the second discontinuous space to perform PDSCH dual-stream reception, the base station can receive the PDSCH dual-stream from w 18 tow 21 Two codewords are selected from the codewords in the column to enhance the mapping relationship between the PDSCH logical port and the physical antenna element corresponding to the second discontinuous space.

[0221] Because the four physical antenna elements are located in two independent discontinuous spaces, the two discontinuous spaces are independent of each other and have natural spatial isolation, which results in two downlink antennas in the space where any terminal is located. A single discontinuous space can only send two-stream PDSCH data, and cannot send four-stream PDSCH data, which is determined by the physical characteristics of wireless transmission. 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 schedules two user terminals in a single discontinuous space to form a user terminal group; the base station schedules two user terminals in the single discontinuous space to form a user terminal group according to the first physical resource mapping strategy W 4,2 To configure, from w 14 tow 21 Select appropriate codewords from the codewords in the column to separate four PDSCH data streams, and send them to two UEs to form downlink four-stream transmission; the base station performs downlink data transmission to the user terminal group.

[0222] In summary, the downlink data transmission method provided in the present application is executed in conjunction with a base station using an N-antenna network covering M discontinuous spaces, so that the base station uses the first physical resource mapping strategy W N,MThe configuration is performed so that any terminal within the coverage of the physical antenna can receive SSB data and PDCCH data, and any terminal within the coverage of the physical antenna can access the network and transmit data, thereby improving the downlink data transmission efficiency of the base station. There is a corresponding relationship between the N physical antenna elements and the M discontinuous spaces. The first physical resource mapping strategy W N,M There are multiple forms of expression as the correspondence between N physical antenna elements and M discontinuous spaces is different. In the case where the coverage of multiple physical antenna elements defines a single discontinuous space, the first physical resource mapping strategy W N,M The mapping relationship between the PDSCH logical port and the physical antenna element corresponding to the discontinuous space is also enhanced, thereby improving the spectrum utilization rate.

[0223] It should also be emphasized that the base station described in this application is different from an indoor distributed base station system. Indoor distributed base station systems usually use multiple low-power antennas to provide overall coverage. These physical antennas are only connected by coaxial cables, power dividers, and couplers. The downlink data sent by multiple antennas are exactly the same. The base station cannot distinguish the coverage areas of different antennas, and cannot use the location information of the terminal for scheduling optimization. However, this solution supports the base station to distinguish the coverage areas of different antennas, and can use the location information of the terminal for scheduling optimization, realize downlink multi-stream transmission, and improve spectrum utilization. In addition, this solution does not require hardware updates, and can be implemented only by software upgrades, which expands the versatility of small base stations or indoor base stations.

[0224] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of further restrictions, an element defined by the phrase "comprises a ..." does not exclude the existence of other identical elements in the process, method, commodity or device including the element.

[0225] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0226] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. 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 using N antenna networks to cover M discontinuous spaces, characterized in that: include: N physical antenna elements; SSB logical port; PDCCH logical port; 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 strategy includes at least a unit array configuration item and a unit vector configuration item; in, The unit array configuration item is used to establish a mapping relationship between the PDSCH logical port and the N physical antenna elements respectively; The unit vector configuration item is used to establish a mapping relationship between the SSB logical port, the PDCCH logical port and the M discontinuous spaces through each of the N physical antenna elements; The base station is configured according to the first physical resource mapping strategy so that: When the base station receives the location attribute of the user terminal, it determines the space where the user terminal is located; The base station schedules the M user terminals in the discontinuous spaces to form a user terminal group; The base station performs downlink data transmission to the user terminal group.

2. The base station according to claim 1, characterized in that When N=M, the unit array configuration item includes a unit matrix of order equal to N; The unit vector configuration item consists of a vector of all 1s that sets the scaling factor.

3. The base station according to claim 2, characterized in that Any column of the unit array configuration item or the unit vector configuration item represents a codeword; The first physical resource mapping strategy W N,M Also includes the column number index w for codeword numbering k ; When the four antenna networks of the base station cover four discontinuous spaces, the first physical resource mapping strategy W 4,4 It manifests as: Among them, W 4,4 Indicates that the first physical resource mapping strategy is applied to a base station with four antenna networks covering four discontinuous spaces; And W 4,4 Indicates that the first physical resource mapping strategy satisfies N=M, The first physical resource mapping strategy W 4,4 The codewords in columns w1 to w4 constitute unit array configuration items, which are expressed as unit matrices with an order of 4, and are used to establish mapping relationships between the PDSCH logical ports and the four physical antenna elements respectively; the codewords in column w5 constitute unit vector configuration items, which are expressed as all-1 vectors with a scaling factor of 1 / 2, and are used to establish mapping relationships between the SSB logical port and the PDCCH logical port and the four physical antenna elements, so that terminals in four discontinuous spaces can receive SSB data or PDCCH data.

4. The base station according to claim 1, characterized in that When N>M, the unit array configuration item includes a unit matrix of order equal to N; The unit vector configuration item includes at least an all-ones vector that sets the scaling factor; The first physical resource mapping strategy also includes a precoding enhancement matrix for enhancing the mapping relationship between the PDSCH logical port and the M discontinuous spaces; The precoding enhancement matrix at least includes a single-stream precoding matrix corresponding to single-stream transmission in the discontinuous space where the user terminal is located, and a multi-stream precoding matrix corresponding to multi-stream transmission in the discontinuous space where the user terminal is located.

5. The base station according to claim 4, characterized in that Any column of the unit array configuration item, the unit vector configuration item or the precoding enhancement matrix represents a codeword; The first physical resource mapping strategy W N,M Also includes the column number index w for codeword numbering k ; When the four antenna networks of the base station cover two discontinuous spaces, the first physical resource mapping strategy W 4,2 It manifests as: Among them, W 4,2 Indicates that the first physical resource mapping strategy is applied to a base station with four antenna networks covering two discontinuous spaces; And W 4,2 Indicates that the first physical resource mapping strategy satisfies N>M, The first physical resource mapping strategy W 4,2 The codewords in columns w1 to w4 constitute unit array configuration items, which are expressed as unit matrices with an order of 4, and are used to establish mapping relationships between PDSCH logical ports and four physical antenna elements respectively; the codewords in columns w5 constitute unit vector configuration items, which are expressed as all-1 vectors with a scaling factor of 1 / 2, and are used to establish mapping relationships between SSB logical ports and PDCCH logical ports and four physical antenna elements, so that terminals in two discontinuous spaces can receive SSB data or PDCCH data; 13 The codewords in the columns constitute a single-stream precoding matrix, which is used to map the single-stream PDSCH data to the two physical antenna arrays in the space where the terminal is located when the base station schedules the terminal to receive the single-stream PDSCH, so as to improve the signal quality of the single-stream PDSCH; 14 tow 21 The codewords in the columns constitute a multi-stream precoding matrix, which is used to map 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 signal quality of the multi-stream PDSCH.

6. The base station according to claim 5, characterized in that The precoding enhancement matrix is ​​used to enhance the mapping relationship between the PDSCH logical port and the M discontinuous spaces, and is specifically used for: When the base station schedules the terminal located in the first discontinuous space to receive the PDSCH single stream, from w6 to Selecting a codeword from the codewords in column w9 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 located in the second discontinuous space to receive a single stream of PDSCH, 10 tow 13 A codeword is selected from the codewords in the column to enhance the mapping relationship between the PDSCH logical port and the physical antenna element corresponding to the second discontinuous space.

7. The base station according to claim 5, characterized in that The precoding enhancement matrix is ​​used to enhance the mapping relationship between the PDSCH logical port and the M discontinuous spaces, and is specifically used for: When the base station schedules the terminal located in the first discontinuous space to perform PDSCH dual-stream reception, 14 tow 17 Select two codewords from the codewords in the column 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 located in the second discontinuous space to perform PDSCH dual-stream reception, 18 tow 21 Two codewords are selected from the codewords in the column to enhance the mapping relationship 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: Cooperate with the base station described in claim 1 to perform the following steps: When the base station receives the location attribute of the user terminal, it determines the space where the user terminal is located; The base station schedules the M user terminals in the space to form a user terminal group; 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 to perform downlink data transmission to the user terminal group.

9. The downlink data transmission method according to claim 8, characterized in that: The first physical resource mapping strategy includes at least a unit array configuration item and a unit vector configuration item; Among them, the unit array configuration item is used to establish a mapping relationship between the PDSCH logical port and the N physical antenna elements respectively; The unit vector configuration item is used to establish a mapping relationship between the SSB logical port, the PDCCH logical port and the M discontinuous spaces through each of the N physical antenna elements.

10. The downlink data transmission method according to claim 9, characterized in that: The unit array configuration item includes a unit matrix of order equal to N; The unit vector configuration item consists of a vector of all 1s that sets the scaling factor.

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