Downlink transmission control method, device, storage medium and base station

Abstract

The present disclosure proposes a downlink transmission control method, device, storage medium and base station, which relate to the field of mobile communication technology. A downlink transmission control method disclosed in the present disclosure includes: obtaining the traffic volume of 5G new radio interface NR users in each cell within a predetermined range; determining the cell with the largest traffic volume of 5G NR users within the predetermined range as the target cell; in the case where the current cell is not the target cell, obtaining the frame structure of the downlink frame of the target cell as the target frame structure, wherein the downlink frame includes at least one subframe of the multicast multicast single frequency network MBSFN subframe or the LTE normal Normal subframe; adjusting the frame structure of its own downlink frame to the target frame structure. Through such a method, it is possible to avoid excessive interference of the LTE CRS of the adjacent cell to the NR users of other cells, thereby improving the service quality for 5G NR users.

Description

Technical Field

[0001] The present disclosure relates to the field of mobile communication technology, and in particular to a downlink transmission control method, device, storage medium and base station. Background Art

[0002] In the DSS (Dynamic Spectrum Sharing) network, in order to avoid the conflict between the main signals of NR (New Radio) and LTE (Long Term Evolution), the MBSFN (Multicast Broadcast Single Frequency Network) subframe scheme and CRS (Cell Reference Signal) puncturing scheme (i.e., rate matching scheme) will be used.

[0003] In the LTE MBSFN subframe solution, CRS may not be sent. Only 1 to 3 symbols are needed to send PDCCH (Physical Downlink Control Channe), PCFICH (Physical Control Format Indicator Channel) and PHICH (Physical Hybrid ARQ Indicator Channel). Other symbols can be used to schedule NR users and LTE TM9 users, but not LTE TM4 users.

[0004] In the LTE Normal subframe scheme, the 5G terminal can obtain the LTE PDCCH and CRS location information of the cell, and puncture the NR PDSCH at the location of the LTE CRS to achieve spectrum sharing through Rate Matching. Summary of the invention

[0005] One object of the present disclosure is to improve NR performance in DSS.

[0006] According to one aspect of some embodiments of the present disclosure, a downlink transmission control method is proposed, including: obtaining the traffic volume of 5G NR users of each cell within a predetermined range; determining the cell with the largest traffic volume of 5G NR users within the predetermined range as the target cell; when the current cell is not the target cell, obtaining the frame structure of the downlink frame of the target cell as the target frame structure, wherein the downlink frame includes at least one of the MBSFN subframes or the LTE Normal subframes; and adjusting the frame structure of its own downlink frame to the target frame structure.

[0007] In some embodiments, obtaining the frame structure of the downlink frame of the target cell includes: obtaining the subframe number of the MBSFN subframe in the downlink frame of the target cell.

[0008] In some embodiments, the downlink transmission control method also includes: before determining the target cell, determining the frame structure of its own initial downlink frame according to the traffic volume of 5G NR users within the current coverage area, wherein the MBSFN subframes in its own initial downlink frame are used to carry the traffic of 5GNR users, and the number of MBSFN subframes in its own initial downlink frame is positively correlated with the traffic volume of 5GNR users.

[0009] In some embodiments, the downlink transmission control method further includes: when the current cell is the target cell, the frame structure of the current cell is not adjusted.

[0010] In some embodiments, the downlink frame includes a predetermined first number of subframes, each subframe occupies a first predetermined time length, and the downlink frame occupies a predetermined first number of first predetermined time lengths; the downlink frame includes 1 to a predetermined first number of MBSFN subframes.

[0011] In some embodiments, the predetermined first number is 5; the first predetermined time length is 1 ms; and the time length occupied by the downlink frame is 5 ms.

[0012] In some embodiments, the downlink transmission control method further includes: after adjusting the frame structure of its own downlink frame to the target frame structure, scheduling LTE transmission mode TM9 users by using the remaining resources for scheduling 5G NR users in the MBSFN subframe in the downlink frame.

[0013] According to one aspect of some embodiments of the present disclosure, a downlink transmission control device is proposed, including: a traffic volume acquisition unit, configured to acquire the traffic volume of 5G NR users of each cell within a predetermined range; a target cell determination unit, configured to determine the cell with the largest traffic volume of 5G NR users within the predetermined range as the target cell; a target frame structure acquisition unit, configured to, when the current cell is not the target cell, acquire the frame structure of the downlink frame of the target cell as the target frame structure, wherein the downlink frame includes at least one of MBSFN subframes or LTE Normal subframes; and a frame structure adjustment unit, configured to adjust the frame structure of its own downlink frame to the target frame structure.

[0014] In some embodiments, the downlink transmission control device also includes: an initial frame structure determination unit, which is configured to determine the frame structure of its own initial downlink frame according to the traffic volume of 5G NR users in the current coverage area before determining the target cell, wherein the MBSFN subframes in its own initial downlink frame are used to carry the traffic of 5G NR users, and the number of MBSFN subframes in its own initial downlink frame is positively correlated with the traffic volume of 5G NR users.

[0015] In some embodiments, the downlink transmission control device also includes: a downlink scheduling unit, which is configured to schedule LTE transmission mode TM9 users by using the remaining resources for scheduling 5G NR users in the MBSFN subframe in the downlink frame after adjusting the frame structure of its own downlink frame to the target frame structure.

[0016] According to one aspect of some embodiments of the present disclosure, a downlink transmission control device is proposed, comprising: a memory; and a processor coupled to the memory, wherein the processor is configured to execute any one of the above downlink transmission control methods based on instructions stored in the memory.

[0017] According to one aspect of some embodiments of the present disclosure, a computer-readable storage medium is provided, on which computer program instructions are stored, and when the instructions are executed by a processor, the steps of any one of the above downlink transmission control methods are implemented.

[0018] According to one aspect of some embodiments of the present disclosure, a base station is proposed, comprising: any one of the downlink transmission control devices described above; and an antenna configured to transmit downlink signals and receive uplink signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of the present disclosure. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure. In the drawings:

[0020] Figure 1The present invention is a flowchart of some embodiments of the downlink transmission control method of the present invention.

[0021] Figure 2 Schematic diagrams of other embodiments of the downlink transmission control method disclosed in the present invention.

[0022] Figure 3 A partial structural diagram of a downlink frame of some embodiments of the downlink transmission control method disclosed in the present invention.

[0023] Figure 4 Schematic diagram of some embodiments of the downlink transmission control device disclosed in the present invention.

[0024] Figure 5 Schematic diagrams of other embodiments of the downlink transmission control device disclosed in the present invention.

[0025] Figure 6 Schematic diagram of some other embodiments of the downlink transmission control device disclosed in the present invention

[0026] Figure 7 Schematic diagrams of some embodiments of the base station disclosed herein. DETAILED DESCRIPTION

[0027] The technical solution of the present disclosure is further described in detail below through the accompanying drawings and embodiments.

[0028] The inventors found that in the DSS networking test using the LTE Normal subframe solution, the 2.1G NR-Only networking performance was excellent and basically equivalent to LTE-Only. However, after DSS was turned on, the performance of 2.1G NR decreased significantly. The inventors found that because the NR terminal did not support the CRS-IC function, the interference of the neighboring LTE to the target cell NR was too large, resulting in a decrease in the performance of 2.1G NR.

[0029] The flowcharts of some embodiments of the downlink transmission control method disclosed in the present invention are as follows: Figure 1 shown.

[0030] In step 120, the traffic volume of 5G NR users of each cell within a predetermined range is obtained. In some embodiments, each cell can count the traffic volume of 5G NR users within its own coverage area, and then count the results through interaction and communication between base stations.

[0031] In some embodiments, statistics may be collected on the network side at the beginning of a configuration period.

[0032] In some embodiments, the predetermined range may be a preset area or a predetermined number of adjacent cells.

[0033] In step 130, the cell with the largest traffic volume of 5G NR users within the predetermined range is determined as the target cell. In some embodiments, the base station can compare the traffic volume information of 5G NR users of each cell obtained with the traffic volume of its own 5G NR users to determine the cell with the largest traffic volume of 5G NR users, that is, the target cell.

[0034] In step 140, it is determined whether the current cell is the target cell. If the current cell is the target cell, that is, the traffic volume of the 5G NR user in the current cell is the largest within the predetermined range, there is no need to modify the frame structure of the downlink frame, and the user scheduling is performed with the frame structure of the downlink frame currently used; otherwise, step 141 is executed.

[0035] In step 141, a frame structure of a downlink frame of a target cell is obtained as a target frame structure. The downlink frame includes at least one of an MBSFN subframe or an LTE Normal subframe, such as an MBSFN subframe and an LTE Normal subframe, or only an MBSFN subframe, or only an LTE Normal subframe. The target frame structure includes at least one MBSFN subframe. In some embodiments, the frame structure of the downlink frame of the target cell obtained may be a subframe number of an MBSFN subframe in the downlink frame of the target cell.

[0036] In step 150, the frame structure of its own downlink frame is adjusted to the target frame structure.

[0037] This method enables cells with similar distances to adopt the same downlink frame structure, avoiding excessive interference of LTE CRS of adjacent cells in DSS networking to NR users in other cells when 5G NR terminals do not need to support the CRS-IC function, thereby improving the service quality for 5G NR users.

[0038] In some embodiments, in order to ensure downlink frame synchronization of adjacent cells and further reduce interference, it is necessary to pre-set the number of subframes in each downlink frame, the duration occupied by the downlink frame, and the duration occupied by each subframe. In some embodiments, the downlink frame includes a predetermined first number of subframes, each subframe occupies a first predetermined time length, and the downlink frame occupies a predetermined first number of first predetermined time lengths; the downlink frame includes 1 to a predetermined first number of MBSFN subframes. In some embodiments, the predetermined first number is 5; the first predetermined time length is 1ms, and the time length occupied by the downlink frame is 5ms.

[0039] In some embodiments, the configuration period of the frame format of the downlink frame may be set, such as 5 ms. The operation in step 120 is performed at the beginning of each configuration period, so as to quickly respond to changes in user traffic and further improve service quality.

[0040] Schematic diagrams of other embodiments of the downlink transmission control method disclosed in the present invention are as follows Figure 2 shown.

[0041] In step 210, the frame structure of its own initial downlink frame is determined according to the traffic volume of 5G NR users in the current coverage area. The MBSFN subframes in its own initial downlink frame are only used to carry the traffic of 5G NR users, and the number of MBSFN subframes in its own initial downlink frame is positively correlated with the traffic volume of 5G NR users.

[0042] If the MBSFN subframe does not occupy the entire downlink frame, the other subframes are LTE Normal subframes. LTE Normal subframes can schedule LTE TM4 users and LTE TM9 users, but cannot schedule 5G NR users.

[0043] In some embodiments, the length of the LTE FDD (Frequency Division Duplexing) radio frame can be set to 5ms, including 5 radio subframes with a length of 1ms, and the subframes are numbered #0 to #4. The radio frame can be configured with 0 to 5 LTE MBSFN subframes with a length of 1ms starting from subframe #0 according to the service needs of the network side. In the frame structure of the initial downlink frame, the number of MBSFN subframes is determined according to the traffic volume of 5G NR users, that is, while ensuring that the MBSFN subframe can carry the traffic volume of all 5G NR users, there will be no situation where the entire MBSFN subframe is scheduled for LTE TM9 users. In some embodiments, the remaining resources in the MBSFN subframe after carrying the 5G NR user service can be used to call LTE TM9 users, thereby ensuring the effective use of downlink time and frequency resources.

[0044] In step 220, before the configuration period starts, the traffic volume of 5G new radio interface NR users in each cell within a predetermined range is obtained.

[0045] In step 230, a cell with the largest traffic volume of 5G NR users within a predetermined range is determined as a target cell.

[0046] In step 240 , if the current cell is the target cell, execute step 242 ; otherwise, execute step 241 .

[0047] In step 241 , the frame structure of the downlink frame of the target cell is obtained as the target frame structure, and then step 250 is executed.

[0048] In step 242 , the frame structure of the initial downlink frame of the current cell is used as the target frame structure, and the frame structure of the current cell is not adjusted, and then step 262 is executed.

[0049] In step 250 , the frame structure of its own downlink frame is adjusted to the target frame structure, and then step 261 is executed.

[0050] In step 261, the remaining resources for scheduling 5G NR users in the MBSFN subframe in the downlink frame are used to schedule LTETM9 users.

[0051] In some embodiments, due to the use of the frame structure of the cell with the most 5G NR user traffic, the MBSFN subframe may have surplus traffic for the 5G NR users of the current cell, and the remaining MBSFN subframe resources (which may include the entire MBSFN subframe, or part of the time-frequency resources in the MBSFN subframe) are used to schedule LTE TM9 users. In addition, if the MBSFN subframe does not fully occupy the downlink frame, the other subframes are LTE Normal subframes. LTE Normal subframes can schedule LTE TM4 users and LTE TM9 users, but cannot schedule 5G NR users.

[0052] In step 262, the MBSFN subframe in the downlink frame schedules the 5G NR user, and the state set in step 210 remains unchanged.

[0053] Through this method, the initial frame structure of each cell can be set according to the traffic volume of 5G NR users, avoiding setting too many MBSFN subframes to affect the scheduling of LTE TM4 users; the frame structure of the adjacent cell can be configured according to the frame structure of the cell with the largest traffic volume of 5G NR users, avoiding affecting the service quality of 5G NR users and improving the service performance of 5G NR users; when there are surplus resources for scheduling 5G NR users using MBSFN subframes, the remaining resources are used to preferentially schedule LTE TM9 users, and while making full use of the time and frequency resources occupied by MBSFN subframes, more time and frequency resources of LTE Normal subframes are reserved for LTE TM4 users, avoiding reducing the service capacity for LTE TM4 users.

[0054] A partial structural diagram of a downlink frame in some embodiments of the downlink transmission control method disclosed in the present invention is as follows: Figure 3 shown.

[0055] The uppermost part of the figure shows that the entire downlink frame includes 5 subframes, of which the first subframe (subframe #0) is an MBSFN subframe and the other subframes are LTE Normal subframes.

[0056] The 5G NR user traffic of Cell 1 is higher than that of Cell 2, and only one LTE MBSFN subframe is configured at the #0 subframe position to just meet its 5G NR user traffic transmission needs.

[0057] like Figure 3 As shown in the figure, the LTE MBSFN subframes of Cell 1 carry 5G NR user services, and the LTE Normal subframes carry LTE TM4 and LTE TM9 user services. The LTE MBSFN subframes of Cell 2 carry 5G NR and LTE TM9 user services, and the LTE Normal subframes carry LTE TM4 and LTE TM9 user services.

[0058] When adjacent cells transmit downlink frames at the same time, each cell can send LTE Normal subframes and LTE MBSFN subframes at the same time, thus avoiding interference from the LTE CRS of adjacent cells when sending MBSFN subframes carrying 5G NR data, thereby solving the problem of excessive interference of LTE CRS on NR PDSCH and ensuring NR user experience.

[0059] Schematic diagrams of some embodiments of the downlink transmission control device disclosed in the present invention are as follows Figure 4 shown.

[0060] The traffic volume acquisition unit 402 can obtain the traffic volume of 5G NR users of each cell within the predetermined range. In some embodiments, each cell can count the traffic volume of 5G NR users within its own coverage area, and then count the results through the interaction between base stations. In some embodiments, statistics can be performed on the network side at the beginning of the configuration cycle. In some embodiments, the predetermined range can be a pre-set area or a predetermined number of adjacent cells.

[0061] The target cell determination unit 403 can determine the cell with the largest traffic volume of 5G NR users within a predetermined range as the target cell. In some embodiments, the base station can compare the traffic volume information of 5G NR users of each cell obtained with the traffic volume of its own 5G NR users to determine the cell with the largest traffic volume of 5G NR users, that is, the target cell.

[0062] The target frame structure acquisition unit 404 can acquire the frame structure of the downlink frame of the target cell as the target frame structure when the current cell is not the target cell. The downlink frame includes at least one of an MBSFN subframe or an LTE Normal subframe, such as an MBSFN subframe and an LTE Normal subframe, or only an MBSFN subframe, or only an LTE Normal subframe. The target frame structure includes at least one MBSFN subframe.

[0063] The frame structure adjustment unit 405 can adjust the frame structure of its own downlink frame to the target frame structure.

[0064] Such a downlink transmission control device can enable cells with similar distances to adopt the same downlink frame structure, avoiding excessive interference of LTE CRS of adjacent cells in 4G 5G DSS networking to NR users in other cells, thereby improving the service quality for 5G NR users.

[0065] In some embodiments, Figure 4 As shown, the downlink transmission control device may also include an initial frame structure determination unit 401, which can determine the frame structure of its own initial downlink frame according to the traffic volume of 5G NR users in the current coverage area. The MBSFN subframes in its own initial downlink frame are only used to carry the traffic of 5G NR users, and the number of MBSFN subframes in its own initial downlink frame is positively correlated with the traffic volume of 5G NR users.

[0066] If the MBSFN subframe does not occupy the entire downlink frame, the other subframes are LTE Normal subframes. LTE Normal subframes can schedule LTE TM4 users and LTE TM9 users, but cannot schedule 5G NR users.

[0067] Such a downlink control device can set the initial frame structure of each cell according to the traffic volume of 5G NR users, avoiding setting too many MBSFN subframes and affecting the scheduling of LTE TM4 users.

[0068] In some embodiments, Figure 4 As shown, the downlink transmission control device may also include a downlink scheduling unit 406, which can schedule LTE TM9 users through the remaining resources of the 5GNR users scheduled in the MBSFN subframe in the downlink frame after adjusting the frame structure of its own downlink frame to the target frame structure. In some embodiments, since each cell within the predetermined range adopts the frame structure of the cell with the largest 5GNR user traffic, the MBSFN subframe resources may be surplus for the traffic of the 5G NR users in the current cell, and the downlink scheduling unit 406 may use the remaining MBSFN subframe resources (which may include the entire MBSFN subframe, or may include part of the time-frequency resources in the MBSFN subframe) to prioritize scheduling LTE TM9 users. In addition, if the MBSFN subframe does not occupy the entire downlink frame, the other subframes are LTE Normal subframes. The downlink scheduling unit 406 schedules LTE TM4 users and LTE TM9 users with the LTE Normal subframe.

[0069] Such a device can use the remaining resources to prioritize LTE TM9 users when there is excess resource for scheduling 5G NR users using MBSFN subframes. While making full use of the time-frequency resources occupied by MBSFN subframes, more time-frequency resources of LTENormal subframes can be reserved for LTE TM4 users, avoiding reducing the service capacity for LTE TM4 users.

[0070] A structural diagram of an embodiment of the downlink transmission control device disclosed in the present invention is shown in FIG. Figure 5 As shown. The downlink transmission control device includes a memory 501 and a processor 502. Among them: the memory 501 can be a disk, a flash memory or any other non-volatile storage medium. The memory is used to store the instructions in the corresponding embodiment of the downlink transmission control method mentioned above. The processor 502 is coupled to the memory 501 and can be implemented as one or more integrated circuits, such as a microprocessor or a microcontroller. The processor 502 is used to execute the instructions stored in the memory, which can avoid excessive interference of the LTE CRS of the adjacent cell to the NR users of other cells, thereby improving the service quality for 5GNR users.

[0071] In one embodiment, it is also possible to Figure 6 As shown, the downlink transmission control device 600 includes a memory 601 and a processor 602. The processor 602 is coupled to the memory 601 via a BUS 603. The downlink transmission control device 600 can also be connected to an external storage device 605 via a storage interface 604 to call external data, and can also be connected to a network or another computer system (not shown) via a network interface 606. No further detailed description will be given here.

[0072] In this embodiment, by storing data instructions in a memory and then processing the instructions through a processor, it is possible to avoid excessive interference of LTE CRS in adjacent cells on NR users in other cells, thereby improving the service quality for 5G NR users.

[0073] In another embodiment, a computer-readable storage medium stores thereon computer program instructions, which, when executed by a processor, implement the steps of the method in the corresponding embodiment of the downlink transmission control method. It should be understood by those skilled in the art that the embodiments of the present disclosure may be provided as methods, devices, or computer program products. Therefore, the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present disclosure may take the form of a computer program product implemented on one or more computer-usable non-transient storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0074] Schematic diagrams of some embodiments of the base station disclosed in the present invention are as follows Figure 7 shown.

[0075] The downlink transmission control device 71 may be any one of the above-mentioned ones. The antenna 72 may transmit downlink signals and receive uplink signals. In some embodiments, the frame structure of the downlink frame sent by the antenna 72 is determined by the downlink transmission control device 71 .

[0076] Such a base station can enable cells with similar distances to adopt the same downlink frame structure, avoiding excessive interference of LTE CRS of adjacent cells in 4G 5G DSS networking on NR users in other cells, thereby improving the service quality for 5G NR users.

[0077] The present disclosure is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present disclosure. It should be understood that each process and / or block in the flowchart and / or block diagram and the combination of processes and / or blocks in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0078] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0079] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0080] So far, the present disclosure has been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0081] The method and apparatus of the present disclosure may be implemented in many ways. For example, the method and apparatus of the present disclosure may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above order of steps for the method is for illustration only, and the steps of the method of the present disclosure are not limited to the order specifically described above, unless otherwise specifically stated. In addition, in some embodiments, the present disclosure may also be implemented as a program recorded in a recording medium, which includes machine-readable instructions for implementing the method according to the present disclosure. Therefore, the present disclosure also covers a recording medium storing a program for executing the method according to the present disclosure.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present disclosure rather than to limit it. Although the present disclosure has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present disclosure can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present disclosure, which should be included in the scope of the technical solution for protection of the present disclosure.

Claims

1. A downlink transmission control method, comprising: Obtain the traffic volume of 5G new radio interface NR users in each cell within a predetermined range; Determine a cell with the largest traffic volume of the 5G NR user within a predetermined range as a target cell; In the case where the current cell is not the target cell, acquiring a frame structure of a downlink frame of the target cell as a target frame structure, wherein the downlink frame includes at least one of a multicast single frequency network MBSFN subframe or a LTE normal subframe; The frame structure of its own downlink frame is adjusted to the target frame structure.

2. The method according to claim 1, wherein: The acquiring the frame structure of the downlink frame of the target cell includes: acquiring the subframe number of the MBSFN subframe in the downlink frame of the target cell.

3. The method according to claim 1, further comprising: Before determining the target cell, the frame structure of its own initial downlink frame is determined according to the traffic volume of 5G NR users within the current coverage area, wherein the MBSFN subframes in its own initial downlink frame are used to carry the traffic of the 5G NR users, and the number of MBSFN subframes in its own initial downlink frame is positively correlated with the traffic volume of the 5G NR users.

4. The method according to claim 3, further comprising: When the current cell is the target cell, the frame structure of the current cell is not adjusted.

5. The method according to claim 1, wherein: The downlink frame includes a predetermined first number of subframes, each subframe occupies a first predetermined time length, and the downlink frame occupies a predetermined first number of the first predetermined time length; The downlink frame includes 1 to a predetermined first number of the MBSFN subframes.

6. The method according to claim 5, wherein: The predetermined first number is 5; The first predetermined time length is 1 ms; and The time length occupied by the downlink frame is 5 ms.

7. The method according to any one of claims 1 to 6, further comprising: After adjusting the frame structure of its own downlink frame to the target frame structure, the LTE transmission mode TM9 user is scheduled by using the remaining resources for scheduling 5G NR users in the MBSFN subframe in the downlink frame.

8. A downlink transmission control device, comprising: A traffic volume acquisition unit is configured to acquire the traffic volume of 5G new radio interface NR users of each cell within a predetermined range; A target cell determining unit is configured to determine a cell with the largest traffic volume of the 5G NR user within a predetermined range as a target cell; a target frame structure acquisition unit, configured to, when the current cell is not the target cell, acquire a frame structure of a downlink frame of the target cell as the target frame structure, wherein the downlink frame includes at least one of a multicast single frequency network MBSFN subframe or a LTE normal subframe; The frame structure adjustment unit is configured to adjust the frame structure of its own downlink frame to the target frame structure.

9. The apparatus according to claim 8, further comprising: The initial frame structure determination unit is configured to determine the frame structure of its own initial downlink frame according to the traffic volume of 5G NR users in the current coverage area before determining the target cell, wherein the MBSFN subframes in its own initial downlink frame are used to carry the traffic of the 5G NR users, and the number of MBSFN subframes in its own initial downlink frame is positively correlated with the traffic volume of the 5GNR users.

10. The device according to claim 8 or 9, further comprising: The downlink scheduling unit is configured to schedule LTE transmission mode TM9 users through remaining resources for scheduling 5G NR users in the MBSFN subframe in the downlink frame after adjusting the frame structure of its own downlink frame to the target frame structure.

11. A downlink transmission control device, comprising: Memory; as well as A processor coupled to the memory, the processor being configured to execute the method according to any one of claims 1 to 7 based on instructions stored in the memory.

12. A computer-readable storage medium having computer program instructions stored thereon, which, when executed by a processor, implement the steps of the method according to any one of claims 1 to 7.

13. A base station, comprising: The downlink transmission control device according to any one of claims 8 to 11; and The antenna is configured to transmit downlink signals and receive uplink signals.

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