Cell handover method, device, communication equipment and storage medium

Abstract

An embodiment of the present application provides a cell handover method, apparatus, communication device, and storage medium. The method includes: monitoring spatial domain parameters of a terminal during movement with respect to a current serving cell and a current listening cell, where the spatial domain parameters are used to represent the spatial offset degree between the terminal and the current serving cell and between the terminal and the current listening cell; determining, according to the spatial domain parameters of the terminal with respect to the current serving cell and the current listening cell, that the terminal has moved into a handover interval between the current serving cell and the current listening cell, and then using the current listening cell as the new current serving cell of the terminal. During the movement of the terminal, this method can, through the spatial domain parameters of the terminal with respect to the current serving cell and the current listening cell, enable the terminal to switch from the current serving cell to the current listening cell within the handover interval between the current serving cell and the current listening cell, thereby improving the cell handover success rate.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication, and in particular to a cell handover method, apparatus, communication device and storage medium. Background Art

[0002] In a wireless communication system, in order to ensure the continuity of terminal communication, cell handover occurs during the movement of the terminal. Generally, the terminal measures the signal strength of the received cell. If the signal strength of the target cell is greater than that of the serving cell, and the difference between the two signal strengths exceeds a preset threshold, the terminal initiates a handover to switch from the serving cell to the target cell. However, in the case of a relatively high terminal moving speed, the handover success rate of the traditional cell handover method is relatively low. Summary of the Invention

[0003] This application provides a cell handover method, apparatus, communication device and storage medium.

[0004] In a first aspect, an embodiment of this application provides a cell handover method, including:

[0005] Monitoring the spatial domain parameters of the terminal during movement with the current serving cell and the current listening cell, where the spatial domain parameters are used to represent the spatial offset degree between the terminal and the current serving cell and the current listening cell;

[0006] According to the spatial domain parameters of the terminal with the current serving cell and the current listening cell, if it is determined that the terminal moves into the handover interval between the current serving cell and the current listening cell, then the current listening cell is used as the new current serving cell of the terminal.

[0007] In a second aspect, an embodiment of this application provides a cell handover apparatus, which is applied to a cell handover method provided in the first aspect of the embodiments of this application. The apparatus includes:

[0008] A monitoring module, configured to monitor the spatial domain parameters of the terminal during movement with the current serving cell and the current listening cell, where the spatial domain parameters are used to represent the spatial offset degree between the terminal and the current serving cell and the current listening cell;

[0009] A handover module, configured to determine that the terminal moves into the handover interval between the current serving cell and the current listening cell according to the spatial domain parameters of the terminal with the current serving cell and the current listening cell, and then use the current listening cell as the new current serving cell of the terminal.

[0010] In a third aspect, an embodiment of this application provides a communication device, including a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it implements a cell handover method provided in the first aspect of the embodiments of this application.

[0011] In a fourth aspect, an embodiment of the present application provides a storage medium storing a computer program, which when executed by a processor implements a cell handover method provided in the first aspect of the embodiments of the present application.

[0012] In the cell handover method, device, communication device, and storage medium provided in the embodiments of the present application, the communication device monitors the spatial domain parameters of the terminal during movement with respect to the current serving cell and the current listening cell, where the spatial domain parameters are used to represent the spatial offset degree between the terminal and the current serving cell and the current listening cell; according to the spatial domain parameters of the terminal with respect to the current serving cell and the current listening cell, if it is determined that the terminal has moved into the handover interval between the current serving cell and the current listening cell, then the current listening cell is taken as the new current serving cell of the terminal. Since during the cell handover process, the communication device determines that the terminal has moved into the handover interval between the current serving cell and the current listening cell based on the monitored spatial offset degree between the terminal and the current serving cell and the current listening cell and performs cell handover, compared with the traditional technology, that is to say, the technical solution provided in the embodiments of the present application enables the terminal to switch from the current serving cell to the current listening cell within the handover interval between the current serving cell and the current listening cell, thereby improving the cell handover success rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of a communication system to which the cell handover method provided in the embodiments of the present application is applicable;

[0014] Figure 2 is a schematic flow diagram of a cell handover method provided in the embodiments of the present application;

[0015] Figure 3 is another schematic flow diagram of a cell handover method provided in the embodiments of the present application;

[0016] Figure 4 is yet another schematic flow diagram of a cell handover method provided in the embodiments of the present application;

[0017] Figure 5 is a schematic diagram of cell layout in a high - speed rail scenario provided in the embodiments of the present application;

[0018] Figure 6 is a schematic structural diagram of a cell handover device provided in the embodiments of the present application;

[0019] Figure 7 is a schematic structural diagram of a communication device provided in the embodiments of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The cell handover method provided in the embodiments of the present application can be applicable to, for example Figure 1The communication system shown. The communication system may include a communication device 10 and a terminal 11. Among them, the communication device 10 may be a base station of any network standard, such as a 4G, 5G or even future 6G base station. Of course, the communication device 10 may also be a distributed base station (which includes a baseband processing unit and a radio frequency processing unit, and a baseband processing unit may be connected to multiple radio frequency processing units through optical fibers), or the baseband processing unit in the distributed base station. The terminal 11 may be an electronic device such as a smart phone, a tablet computer, a smart watch, a fitness tracker, and a virtual reality device. The embodiments of the present application do not limit the specific forms of the communication device 10 and the terminal 11.

[0021] To make the objectives, technical solutions, and advantages of the present application clearer and more understandable, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other arbitrarily.

[0022] It should be noted that the execution subject of the following method embodiments may be a cell handover device, and the device may be implemented as part or all of the above communication device in a software, hardware, or software-hardware combination manner. The following method embodiments are described by taking the execution subject as a communication device as an example.

[0023] Figure 2 It is a schematic flowchart of a cell handover method provided by an embodiment of the present application. This embodiment relates to a scenario where the current serving cell and the current listening cell of the terminal are non-collocated cells, such as Figure 2 As shown, the method may include:

[0024] S101. Monitor the spatial domain parameters of the terminal during movement with the current serving cell and the current listening cell.

[0025] Among them, the spatial domain parameters are used to represent the spatial offset degree between the terminal and the current serving cell and the current listening cell. Optionally, the spatial domain parameters may be the frequency offset, signal-to-noise ratio, and time offset between the terminal and the current serving cell and the current listening cell, etc., or other parameters used to represent the spatial frequency shift degree between the terminal and the current serving cell and the current listening cell. The current serving cell refers to the cell that provides services to the terminal at the current moment, that is, the cell with a communication connection with the terminal. The current listening cell refers to the cell that does not provide services to the terminal at the current moment but monitors the data of the terminal, and there is no communication connection between it and the terminal. During the movement of the terminal, due to the existence of the Doppler effect, there will be a certain frequency offset between the terminal and the cell. At the same time, due to a certain distance between the terminal and the cell, there will be a certain time offset between the terminal and the cell. During the communication process between the terminal and the current serving cell, in order to ensure the synchronization between the current serving cell area and the terminal, the current serving cell will correct the time offset and frequency offset from the terminal to itself.

[0026] Optionally, the terminal may periodically send an uplink sounding reference signal (SRS). At this time, the communication device may periodically receive the SRS sent by the terminal, and obtain the spatial domain parameters between the terminal and the current serving cell and the current listening cell during the movement of the terminal after demodulating the SRS. Optionally, if the terminal sends a physical uplink shared channel (PUSCH), at this time, the communication device may also demodulate the PUSCH to obtain the spatial domain parameters between the terminal and the current serving cell and the current listening cell during the movement of the terminal.

[0027] Exemplarily, the terminal may periodically send an SRS. At this time, the communication device may periodically receive the SRS sent by the terminal, and obtain the time offset and frequency offset between the terminal and the current serving cell and the current listening cell during the movement of the terminal after demodulating the SRS. In addition, the communication device may also obtain the signal-to-noise ratio between the terminal and the current serving cell and the current listening cell by demodulating the SRS sent by the terminal. If the obtained signal-to-noise ratio is less than the preset threshold value, it may be considered that the time offset and frequency offset between the monitored terminal and the current serving cell and the current listening cell are not credible, and subsequent cell handover is not performed based on the monitored time offset and frequency offset, and monitoring continues.

[0028] S102. According to the spatial domain parameters between the terminal and the current serving cell and the current listening cell, if it is determined that the terminal moves into the handover interval between the current serving cell and the current listening cell, then use the current listening cell as the new current serving cell of the terminal.

[0029] Among them, the above switching interval refers to the coverage overlapping area of the current serving cell and the current monitored cell, which is the best handover zone for the terminal to perform cell handover. In practical applications, in order to ensure the normal communication of the terminal, different coverage scenarios have corresponding requirements for the handover interval between cells, and it is necessary to plan the cells in this coverage scenario according to the on-site geographical environment. For example, when the coverage scenario is a high-speed rail scenario, the cell planning can be carried out according to the high-speed rail line and the geographical environment along the line. At the same time, in order to ensure that the terminal can complete the handover within the handover interval between cells, the length of the handover interval needs to be set accordingly. At the same time, the position of the handover interval can be planned in the following way: the central position points of the handover interval between the two cells are equidistant from the two cells.

[0030] Considering that the signal strengths of the terminal with the current serving cell and the current monitored cell are comparable within this handover interval, it is very difficult to complete the handover within this handover interval only relying on the signal strengths of the terminal with the current serving cell and the current monitored cell. For this reason, since the spatial domain parameters can represent the spatial offset degree of the terminal with the current serving cell and the current monitored cell, therefore, it is possible to determine whether the terminal has moved into this handover interval based on the spatial domain parameters of the terminal with the current serving cell and the current monitored cell, and when it is determined that the terminal has moved into this handover interval, the current monitored cell is used as the new current serving cell of the terminal, that is, the service of the current serving cell to the terminal is turned off, and the current monitored cell provides service to the terminal, thereby completing the cell handover.

[0031] The cell handover method, device, communication device, and storage medium provided by the embodiments of the present application, the communication device monitors the spatial domain parameters of the terminal with the current serving cell and the current monitored cell during the movement of the terminal, wherein the spatial domain parameters are used to represent the spatial offset degree of the terminal with the current serving cell and the current monitored cell; according to the spatial domain parameters of the terminal with the current serving cell and the current monitored cell, it is determined that the terminal has moved into the handover interval between the current serving cell and the current monitored cell, then the current monitored cell is used as the new current serving cell of the terminal. Since during the cell handover process, the communication device determines that the terminal has moved into the handover interval between the current serving cell and the current monitored cell based on the monitored spatial offset degree of the terminal with the current serving cell and the current monitored cell, and performs cell handover. Compared with the traditional technology, the technical solution provided by the embodiments of the present application can enable the terminal to switch from the current serving cell to the current monitored cell within the handover interval between the current serving cell and the current monitored cell, thereby improving the cell handover success rate.

[0032] In practical applications, the current serving cell and the current listening cell can be co-located cells or non-co-located cells. Optionally, the spatial domain parameters include time offset and frequency offset. When the current serving cell and the current listening cell are non-co-located cells, S102 above can be: determining that the terminal is located in the overlapping area of the current serving cell and the current listening cell according to the time offset between the terminal and the current listening cell, and determining that the terminal is moving away from the current serving cell and approaching the current listening cell according to the frequency offsets between the terminal and the current serving cell and the current listening cell, and then taking the current listening cell as the new current serving cell of the terminal.

[0033] Optionally, the spatial domain parameters include signal-to-noise ratio and frequency offset. When the current serving cell and the current listening cell can be co-located cells, S102 above can be: determining that the terminal enters the main coverage area of the current listening cell according to the signal-to-noise ratios between the terminal and the current serving cell and the current listening cell, and determining that the terminal is moving away from the current serving cell and the current listening cell according to the frequency offsets between the terminal and the current serving cell and the current listening cell, and then taking the current listening cell as the new current serving cell of the terminal.

[0034] The following specifically introduces the cell handover method provided in the embodiments of the present application for different situations.

[0035] Figure 3 Another process schematic diagram of the cell handover method provided in the embodiments of the present application. This embodiment relates to the scenario where the current serving cell and the current listening cell of the terminal are non-co-located cells. As Figure 3 shown, the method may include:

[0036] S201. Monitor the frequency offsets between the terminal and the current serving cell and the current listening cell during the movement of the terminal, and the time offset between the terminal and the current listening cell.

[0037] S202. Determine that the terminal is located in the overlapping area of the current serving cell and the current listening cell according to the time offset between the terminal and the current listening cell, and determine that the terminal is moving away from the current serving cell and approaching the current listening cell according to the frequency offsets between the terminal and the current serving cell and the current listening cell, and then take the current listening cell as the new current serving cell of the terminal.

[0038] Among them, the above overlapping area refers to the coverage overlapping area of the current serving cell and the current listening cell, which is the best handover zone for the terminal to perform cell handover. The communication device can monitor the frequency offset between the terminal and the current serving cell and the current listening cell, as well as the time offset between the terminal and the current listening cell. After obtaining the frequency offset between the terminal and the current serving cell and the current listening cell, and the time offset with the current listening cell, the communication device can determine whether the terminal is located in the overlapping area of the current serving cell and the current listening cell based on the magnitude of the time offset between the terminal and the current listening cell, and determine whether the terminal is moving away from the current serving cell and approaching the current listening cell based on the positive or negative conditions of the frequency offset between the terminal and the current serving cell and the current listening cell. When it is determined that the terminal is located in the overlapping area of the current serving cell and the current listening cell, and it is determined that the terminal is moving away from the current serving cell and approaching the current listening cell, the current listening cell is used as the new current serving cell of the terminal, that is, the service of the current serving cell to the terminal is terminated, and the current listening cell provides service to the terminal, thereby completing the cell handover.

[0039] Optionally, the process of determining that the terminal is located in the overlapping area of the current serving cell and the current listening cell according to the time offset between the terminal and the current listening cell in S202 above may be: if the time offset between the terminal and the current listening cell is less than a preset time offset threshold, it is determined that the terminal is located in the overlapping area of the current serving cell and the current listening cell.

[0040] Optionally, the process of determining that the terminal is moving away from the current serving cell and approaching the current listening cell according to the frequency offset between the terminal and the current serving cell and the current listening cell in S202 above may be: if the frequency offset between the terminal and the current serving cell is negative and the frequency offset with the current listening cell is positive, it is determined that the terminal is moving away from the current serving cell and approaching the current listening cell.

[0041] In this embodiment, when the current serving cell and the current listening cell of the terminal are non - co - located cells, the communication device monitors the frequency offset between the terminal and the current serving cell and the current listening cell during the movement of the terminal, as well as the time offset between the terminal and the current listening cell; determines that the terminal is located in the overlapping area between the current serving cell and the current listening cell according to the time offset between the terminal and the current listening cell, and determines that the terminal is moving away from the current serving cell and approaching the current listening cell according to the frequency offsets between the terminal and the current serving cell and the current listening cell, then takes the current listening cell as the new current serving cell of the terminal. Since during the cell handover process, the communication device determines that the terminal is located in the overlapping area between the current serving cell and the current listening cell based on the monitored time offset between the terminal and the current listening cell, and at the same time, based on the monitored frequency offsets between the terminal and the current serving cell and the current listening cell, executes the cell handover when it determines that the terminal is moving away from the current serving cell and approaching the current listening cell. That is to say, the technical solution provided by this application embodiment can, during the movement of the terminal, through the time offset and frequency offset between the terminal and the current serving cell and the current listening cell, stably and reliably switch the terminal from the current serving cell to the current listening cell in the overlapping area between the current serving cell and the current listening cell, thereby improving the success rate of cell handover.

[0042] In practical applications, a distributed base station can be used to cover various application scenarios. Among them, the distributed base station includes a baseband processing unit and a radio frequency processing unit. One baseband processing unit can be connected to multiple radio frequency processing units through optical fibers, and one baseband processing unit and one radio frequency processing unit form a cell. The above - mentioned current serving cell and current listening cell can share the baseband processing unit or not.

[0043] Optionally, if the current serving cell and the current listening cell share the baseband processing unit, then the current listening cell is the cell among the adjacent cells of the current serving cell where the frequency offset from the terminal to the cell is positive.

[0044] Specifically, for the case where the current serving cell and the current listening cell share a baseband processing unit, after the terminal accesses the current serving cell, the communication device (at this time, the communication device can be the baseband processing unit of the current serving cell) can use the cell with a positive frequency offset from the terminal to the cell among the neighboring cells of the current serving cell as the current listening cell of the terminal. At this time, the communication device continuously monitors the time offset and frequency offset of the terminal to the current serving cell and the current listening cell. As the terminal moves, when it is determined based on the time offset of the terminal to the current listening cell that the terminal has moved to the overlapping area of the current serving cell and the current listening cell, and based on the frequency offset of the terminal to the current serving cell and the current listening cell, it is determined that the terminal is moving away from the current serving cell and approaching the current listening cell, the communication device takes the current listening cell as the new current serving cell of the terminal, that is, the current listening cell provides services for the terminal. At the same time, in order to ensure the communication quality of the terminal during subsequent movement, the communication device uses the cell with a positive frequency offset from the terminal to the cell among the neighboring cells of the current listening cell as the new listening cell of the terminal, and continues to execute the above processes S201 - S202.

[0045] Optionally, if the current serving cell and the current listening cell do not share a baseband processing unit, then the current listening cell is the cell with the smallest time offset and positive frequency offset from the terminal to the cell among the cells of the next baseband processing unit of the baseband processing unit of the current serving cell.

[0046] Specifically, for the case where the current serving cell and the current listening cell do not share a baseband processing unit, that is, the case of cell handover of the terminal across baseband processing units. When the current serving cell is the last cell in its own baseband processing unit, the communication device can send a notification message to the terminal to instruct the terminal to start SSB (Synchronization Signal) scanning to search for a new cell. After a new cell is searched, when the delay from the new cell to the terminal is less than a preset threshold, the terminal will send a Physical Random Access Channel (PRACH). Since different baseband processing units are configured with different logical root sequences, at this time, all cells of the baseband processing unit of the new cell (i.e., the above-mentioned next baseband processing unit) will parse the PRACH to obtain the time offset and frequency offset of the terminal to each cell of the next baseband processing unit. The communication device can use the cell with the smallest time offset and positive frequency offset from the terminal to the cell among the cells of the next baseband processing unit as the current listening cell of the terminal.

[0047] In this way, the communication device continuously monitors the time offset and frequency offset of the terminal to the current serving cell and the current listening cell. As the terminal moves, when it is determined that the terminal has moved to the overlapping area of the current serving cell and the current listening cell based on the time offset of the terminal to the current listening cell, and based on the frequency offsets of the terminal to the current serving cell and the current listening cell, it is determined that the terminal is moving away from the current serving cell and approaching the current listening cell, the communication device will use the current listening cell as the new current serving cell of the terminal, that is, the current listening cell provides services for the terminal. At the same time, in order to ensure the communication quality of the terminal during subsequent movement, the communication device uses, as the new listening cell of the terminal, a cell in the neighboring cells of the current listening cell where the frequency offset of the terminal to the cell is positive, and continues to execute the above processes S201 - S202.

[0048] In this embodiment, it is possible to determine the current listening cell of the terminal according to whether the current serving cell and the current listening cell share a baseband processing unit, and based on the time offset and frequency offset of the terminal to the current serving cell and the current listening cell, achieve the purpose of performing cell handover when the terminal is located in the overlapping area of the current serving cell and the current listening cell, thereby not only realizing cell handover under the same baseband processing unit, but also realizing cell handover across baseband processing units.

[0049] Figure 4 Another flowchart of the cell handover method provided by the embodiment of the present application. This embodiment relates to the scenario where the current serving cell and the current listening cell of the terminal are co - located cells, as Figure 4 shown, the method may include:

[0050] S301. Monitor the frequency offset and signal - to - noise ratio of the terminal to the current serving cell and the current listening cell during the movement of the terminal.

[0051] Among them, the current serving cell refers to the cell that provides services for the terminal at the current moment, that is, the cell having a communication connection with the terminal. The current listening cell refers to the cell that does not provide services for the terminal at the current moment but monitors data of the terminal, and there is no communication connection between it and the terminal. During the movement of the terminal, due to the existence of the Doppler effect, there will be a certain frequency offset between the terminal and the cell.

[0052] Optionally, the terminal may send SRS periodically. At this time, the communication device may receive the SRS sent by the terminal periodically, and after demodulating the SRS, obtain the frequency offset and signal-to-noise ratio of the terminal from the current serving cell and the current listening cell during the movement. If the obtained signal-to-noise ratio is less than a preset threshold, it can be considered that the frequency offset of the terminal from the current serving cell and the current listening cell monitored this time is untrustworthy, and subsequent cell handover is not performed based on the monitored frequency offset and signal-to-noise ratio, and the monitoring continues. Optionally, by demodulating the SRS sent by the terminal, the communication device can also obtain the time offset of the terminal from the current serving cell and the current listening cell.

[0053] Optionally, if the terminal sends a PUSCH, at this time, the communication device can also demodulate the PUSCH to obtain the frequency offset and signal-to-noise ratio of the terminal from the current serving cell and the current listening cell during the movement.

[0054] S302. Determine that the terminal enters the main coverage area of the current listening cell according to the signal-to-noise ratio of the terminal from the current serving cell and the current listening cell, and determine that the terminal is moving away from the current serving cell and the current listening cell according to the frequency offset of the terminal from the current serving cell and the current listening cell, then use the current listening cell as the new current serving cell of the terminal.

[0055] Among them, when the current serving cell and the current listening cell are co-located cells, usually the antenna radiation directions of the current serving cell and the current listening cell are opposite. Therefore, the frequency offsets of the terminal from the current serving cell and the current listening cell monitored by the communication device are basically the same. However, as the terminal moves, the signal-to-noise ratio of the terminal from the current listening cell will become larger and larger, and the signal-to-noise ratio of the terminal from the current serving cell will become smaller and smaller. Based on this, the communication device can determine whether the terminal is moving away from the current serving cell and the current listening cell according to the positive and negative conditions of the frequency offsets of the terminal from the current serving cell and the current listening cell, and determine whether the terminal is entering the main coverage area of the current listening cell based on the comparison result of the signal-to-noise ratios of the terminal from the current serving cell and the current listening cell. When it is determined that the terminal is entering the main coverage area of the current listening cell and is moving away from the current serving cell and the current listening cell, use the current listening cell as the new current serving cell of the terminal, that is, close the service of the current serving cell to the terminal, and the current listening cell provides service for the terminal, so as to complete the cell handover of co-located cells.

[0056] Optionally, if the frequency offsets of the terminal from the current serving cell and the current listening cell are both negative, it is determined that the terminal is moving away from the current serving cell and the current listening cell. If the signal-to-noise ratio of the terminal to the current listening cell is greater than the signal-to-noise ratio of the terminal to the current serving cell, it is determined that the terminal enters the main coverage area of the current listening cell. That is to say, when the communication device detects that the frequency offsets of the terminal from the current serving cell and the current listening cell are both negative, and the signal-to-noise ratio of the terminal to the current listening cell is greater than the signal-to-noise ratio of the terminal to the current serving cell, the current listening cell is used as the new current serving cell of the terminal.

[0057] Optionally, the current serving cell and the current listening cell share a baseband processing unit, and the current listening cell is a cell with a positive frequency offset of the terminal to the cell among the adjacent cells of the current serving cell.

[0058] Specifically, for the case where the current serving cell and the current listening cell share a baseband processing unit and co-locate, after the terminal accesses the current serving cell, the communication device (at this time, the communication device can be the baseband processing unit of the current serving cell) can use, as the current listening cell of the terminal, a cell with a positive frequency offset of the terminal to the cell among the adjacent cells of the current serving cell. At this time, the communication device continuously monitors the frequency offsets and signal-to-noise ratios of the terminal from the current serving cell and the current listening cell. As the terminal moves, based on the frequency offsets of the terminal from the current serving cell and the current listening cell, it is determined that the terminal is moving away from the current serving cell and the current listening cell, that is, at this time, the terminal is located in the coverage boundary area of the current serving cell and the current listening cell; at the same time, when the communication device detects that the signal-to-noise ratio of the terminal to the current serving cell is less than the signal-to-noise ratio of the current listening cell, it can be determined that the terminal is entering the main coverage area of the current listening cell. At this time, the communication device can use the current listening cell as the new current serving cell of the terminal, that is, the current listening cell provides services for the terminal. At the same time, to ensure the communication quality of the terminal during subsequent movement, the communication device can use, as the new listening cell of the terminal, a cell with a positive frequency offset of the terminal to the cell among the adjacent cells of the current listening cell.

[0059] In this embodiment, when the current serving cell and the current listening cell of the terminal are co-located cells, the communication device monitors the frequency offset and signal-to-noise ratio of the terminal with the current serving cell and the current listening cell during the movement of the terminal; determines that the terminal enters the main coverage area of the current listening cell according to the signal-to-noise ratio of the terminal with the current serving cell and the current listening cell, and determines that the terminal is moving away from the current serving cell and the current listening cell according to the frequency offset of the terminal with the current serving cell and the current listening cell, then takes the current listening cell as the new current serving cell of the terminal. Since when the current serving cell and the current listening cell of the terminal are co-located cells, the communication device can determine that when the terminal enters the main coverage area of the current listening cell from the current serving cell based on the frequency offset and signal-to-noise ratio of the terminal with the current serving cell and the current listening cell, and perform cell handover, that is, it can stably and reliably switch the terminal from the current serving cell to the current listening cell at the coverage boundary area between the current serving cell and the current listening cell, thereby improving the cell handover success rate.

[0060] For the convenience of understanding by those skilled in the art, the following takes the application scenario as the high-speed rail scenario as an example to introduce the cell handover method provided by the embodiments of the present application. Of course, the cell handover method provided by the embodiments of the present application is also applicable to the highway scenario. Specifically:

[0061] In order to improve the cell handover success rate in the high-speed rail scenario, it is necessary to plan high-speed rail stations based on the geographical environment along the high-speed rail. The planned site distribution can be seen in Figure 5 . During the process of site planning, the following principles need to be followed:

[0062] a. The length of the overlapping area between cells should satisfy Djd > v * Tsrs, where Djd is the length of the overlapping area, Tsrs is the transmission period of SRS, and v is the train speed (i.e., the moving speed of the terminal). For Tsrs equal to 1 s and v equal to 360 km / h, it is required that Djd is greater than 100 m.

[0063] b. The distances from the two endpoints of the overlapping area to two adjacent cells should satisfy |Dj1 - Dj2| < c * Tcp and |Dd1 - Dd2| < c * Tcp. Here, Dj1 is the distance from the first endpoint of the two endpoints of the overlapping area between cell 1 and cell 2 to cell 1, Dj2 is the distance from the first endpoint of the two endpoints of the overlapping area to cell 2, Dd1 is the distance from the second endpoint of the two endpoints of the overlapping area between cell 1 and cell 2 to cell 1, Dd2 is the distance from the second endpoint of the two endpoints of the overlapping area to cell 2, Tcp is the CP length, and c is the speed of light. For the new air interface with a subcarrier spacing of 30 KHZ, c * Tcp is approximately 700 m. Additionally, for the above-mentioned BS1 as cell 1, BS2 as cell 2, and BS3 as cell 3, it is also required that |Dj2 - Dj3| < c * Tcp and |Dd2 - Dd3| < c * Tcp. Here, Dj3 is the distance from the first endpoint of the two endpoints of the overlapping area between cell 2 and cell 3 to cell 3, and Dd3 is the distance from the second endpoint of the two endpoints of the overlapping area between cell 2 and cell 3 to cell 3.

[0064] c. The position of the overlapping area can be determined as follows: The distances from the central position point of the overlapping area to two adjacent cells are the same.

[0065] Meanwhile, the planned cells can be numbered in the corresponding order. For example, in the case where the cells share a baseband processing unit, the cells can be numbered in the order of 1, 2, 3... When the baseband processing unit changes, the cells of the new baseband processing unit are re-numbered in the order of 1, 2, 3... Of course, the numbers of the cells of different baseband processing units will carry the identifier of the relevant baseband processing unit.

[0066] Next, it is necessary to configure the transmission period Tsrs of the terminal to send SRS and the time-frequency resources corresponding to SRS. For example, the communication device schedules the accessed terminals to send 2-symbol SRS with a period of Tsrs. For high-density users on the train (such as each carriage is 25 meters long and fully occupied with about 80 people), Tsrs can be considered to be set to 1 s. Meanwhile, the comb-shaped frequency division can be set to 4 comb divisions to ensure that the time-frequency resources can support at least 400 users per second.

[0067] First, take the current serving cell N 1，1 and the current listening cell N 1，2 sharing the baseband processing unit 1 as an example for introduction:

[0068] For the case where the current serving cell and the current listening cell are non - co - located cells, when the terminal initially accesses the cell of the baseband processing unit, the communication device can parse the time offset and frequency offset of each cell of the baseband processing unit through the PRACH sent by the terminal, and use the cell with the smallest time offset and positive frequency offset as the current serving cell of the terminal. Among the adjacent cells of the current serving cell, the cell with a positive frequency offset from the terminal to the cell is used as the current listening cell of the terminal. In this way, the communication device can monitor the time offset, frequency offset, and signal - to - noise ratio of the terminal to the current serving cell and the current listening cell by demodulating the SRS sent by the terminal. If the signal - to - noise ratio is less than the preset threshold value, it can be considered that the time offset and frequency offset of the terminal to the current serving cell and the current listening cell in this monitoring are not credible, and subsequent cell handover is not performed based on the monitored time offset and frequency offset, and the monitoring continues.

[0069] As the terminal moves continuously, the terminal gets closer and closer to N 1，2 , and the time offset of the terminal to N 1，2 becomes smaller and smaller. When it is monitored that the time offset of the terminal to N 1，2 is less than the preset time - offset threshold, it can be determined that the terminal is located in the overlapping area of N 1，1 and N 1，2 . Since when planning the coverage sites of high - speed railways, the position of the overlapping area is set in the middle of two cells, therefore, as the terminal moves, the frequency offset of the terminal to N 1，1 will become negative, and the frequency offset to N 1，2 will become positive. At this time, the best handover point appears, and the current listening cell N 1，2 can be used as the new current serving cell of the terminal. At the same time, among the adjacent cells of the current listening cell N 1，2 , the cell with a positive frequency offset is used as the new current listening cell of the terminal (i.e., N 1，3 is used as the new current listening cell of the terminal). When N 1，2 provides services to the terminal, N 1，2 adjusts the time offset of the terminal to it in real time to make it approach zero. At the same time, N 1，2 uses the signal - to - noise ratio of the terminal to N 1，2 as the starting point for adaptive modulation and coding (AMC) adjustment of the terminal.

[0070] If N 1，2 and N 1，3 are co - located cells, the time offset and frequency offset of the terminal monitored by the communication device to N 1，2 and N 1，3 are always similar. At this time, if the communication device monitors that the frequency offsets of the terminal to N 1，2 and N 1，3 are both less than 0, it is determined that the terminal is located in N1，2 and N 1，3 In the coverage boundary region of, as the terminal moves continuously, if the communication device monitors that the signal-to-noise ratio of the terminal to N 1，3 is greater than the signal-to-noise ratio of the terminal to N 1，2 at this time, the optimal handover point appears, and the communication device can use N 1，3 as the new current serving cell of the terminal. At the same time, use the cell with a positive intermediate frequency offset among the neighboring cells of N 1，3 as the new current listening cell of the terminal (that is, use N 1，4 as the new current listening cell of the terminal).

[0071] Next, take the case where the current serving cell and the current listening cell do not share a baseband processing unit as an example for introduction: the baseband processing unit of the current serving cell is baseband processing unit 1, and the baseband processing unit of the current listening cell is baseband processing unit 2

[0072] First, introduce how to select the current listening cell: Assume that the current serving cell N 1，10 is the last cell of the baseband processing unit. After serving the terminal by N 1，10 , N 1，10 will send a notification message to the terminal to instruct the terminal to start SSB scanning to search for a new cell. The terminal first excludes the cells with a signal-to-noise ratio lower than the preset threshold among the newly searched cells, and then excludes the cells with a negative intermediate frequency offset. Among the remaining cells, it monitors the time offset of the cell with the largest signal-to-noise ratio and parses the Master Information Block (MIB) and System Information Block (SIB) of the cell. After the time offset from this cell to the terminal is less than the preset threshold, it indicates that the terminal has entered the coverage area of the new cell (this new cell does not share a baseband processing unit with N 1，10 ). At this time, the terminal can send a PRACH to start the access process.

[0073] At this time, all cells of the baseband processing unit of the new cell (that is, the above-mentioned next baseband processing unit) are constantly detecting the PRACH sent by the terminal. After detecting the PRACH, only the PRACH with a signal strength greater than the detection threshold is further parsed to obtain the time offset and intermediate frequency offset from the terminal to multiple cells of the next baseband processing unit. The communication device can use the cell with the smallest time offset from the terminal to the cell and a positive intermediate frequency offset among the cells of the next baseband processing unit as the current listening cell N 2,1 .

[0074] Then, after selecting the current listening cell N 2,1 of the terminal, the communication device continuously monitors the terminal to the current serving cell N 1，10 and the current listening cell N2,1 The time offset and frequency offset, as the terminal moves, based on the terminal to N 2,1 Determine that the terminal has moved to N based on the time offset 1，10 And N 2,1 Of the overlapping area, and based on the terminal to N 1，10 And N 2,1 Of the frequency offset, determine that the terminal is moving away from the current serving cell and approaching the current listening cell, then the communication device will use N 2,1 As the new current serving cell of the terminal, that is, provided by N 2,1 To serve the terminal, thereby realizing cell handover across baseband processing units. At the same time, in order to ensure the communication quality of the terminal during subsequent movement, the communication device will use N 2,1 Among the adjacent cells of, the cell with a positive frequency offset from the terminal to the cell is used as the new listening cell of the terminal, and cell handover within the same baseband processing unit continues.

[0075] Figure 6 FIG. is a schematic structural diagram of a cell handover device provided by an embodiment of the present application. This device is applied to the cell handover method described in any of the above embodiments, such as Figure 6 As shown, the device may include: a monitoring module 20 and a handover module 21.

[0076] Specifically, the monitoring module 20 is used to monitor the spatial domain parameters of the terminal during movement with respect to the current serving cell and the current listening cell, where the spatial domain parameters are used to represent the spatial offset degree between the terminal and the current serving cell and the current listening cell;

[0077] The handover module 21 is used to determine, according to the spatial domain parameters of the terminal with respect to the current serving cell and the current listening cell, that the terminal has moved into the handover interval between the current serving cell and the current listening cell, and then use the current listening cell as the new current serving cell of the terminal.

[0078] The cell handover device provided by the embodiment of the present application enables a communication device to monitor the spatial domain parameters of a terminal during movement with respect to the current serving cell and the current listening cell. The spatial domain parameters are used to represent the spatial offset degree between the terminal and the current serving cell and between the terminal and the current listening cell. According to the spatial domain parameters of the terminal with respect to the current serving cell and the current listening cell, if it is determined that the terminal has moved into the handover interval between the current serving cell and the current listening cell, then the current listening cell is taken as the new current serving cell of the terminal. Since during the cell handover process, the communication device determines that the terminal has moved into the handover interval between the current serving cell and the current listening cell based on the monitored spatial offset degree between the terminal and the current serving cell and the current listening cell, and then performs the cell handover. Compared with the traditional technology, the technical solution provided by the embodiment of the present application enables the terminal to switch from the current serving cell to the current listening cell within the handover interval between the current serving cell and the current listening cell, thereby improving the cell handover success rate.

[0079] Based on the above embodiment, optionally, the spatial domain parameters include time offset and frequency offset. Specifically, the handover module 21 is configured to, when the current serving cell and the current listening cell are non - co - located cells, determine that the terminal is located in the overlapping area between the current serving cell and the current listening cell according to the time offset between the terminal and the current listening cell, and determine that the terminal is moving away from the current serving cell and approaching the current listening cell according to the frequency offsets between the terminal and the current serving cell and between the terminal and the current listening cell, and then take the current listening cell as the new current serving cell of the terminal.

[0080] Based on the above embodiment, optionally, the spatial domain parameters include signal - to - noise ratio and frequency offset. Specifically, the handover module 21 is configured to, when the current serving cell and the current listening cell are co - located cells, determine that the terminal has entered the main coverage range of the current listening cell according to the signal - to - noise ratios between the terminal and the current serving cell and between the terminal and the current listening cell, and determine that the terminal is moving away from the current serving cell and the current listening cell according to the frequency offsets between the terminal and the current serving cell and between the terminal and the current listening cell, and then take the current listening cell as the new current serving cell of the terminal.

[0081] Optionally, if the current serving cell and the current listening cell share a baseband processing unit, then the current listening cell is the cell among the adjacent cells of the current serving cell where the frequency offset from the terminal to the cell is positive.

[0082] Optionally, if the current serving cell and the current listening cell do not share a baseband processing unit, then the current listening cell is the cell among the cells of the next baseband processing unit of the baseband processing unit of the current serving cell where the time offset from the terminal to the cell is the smallest and the frequency offset is positive.

[0083] Based on the above embodiments, optionally, the handover module 21 includes a first determination unit.

[0084] Specifically, the first determination unit is configured to determine that the terminal is located in the overlapping area of the current serving cell and the current listening cell when the time offset between the terminal and the current listening cell is less than a preset time offset threshold.

[0085] Based on the above embodiments, optionally, the handover module 21 further includes a second determination unit.

[0086] Specifically, the second determination unit is configured to determine that the terminal is moving away from the current serving cell and approaching the current listening cell when the frequency offset between the terminal and the current serving cell is negative and the frequency offset between the terminal and the current listening cell is positive.

[0087] In one embodiment, a communication device is provided, and its internal structural diagram can be as Figure 7 shown. The communication device includes a processor, a memory, a network interface, and an antenna ( Figure 7 not shown in the figure) connected by a system bus. Among them, the processor of the communication device is used to provide computing and control capabilities. The memory of the communication device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the communication device is used to communicate with an external terminal through a network connection. The computer program, when executed by the processor, implements a cell handover method.

[0088] Those skilled in the art can understand that Figure 7 the structure shown in

[0089] In one embodiment, a communication device is provided, including a memory and a processor. A computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0090] Monitor the spatial domain parameters of the terminal during movement with respect to the current serving cell and the current listening cell, where the spatial domain parameters are used to represent the spatial offset degree of the terminal with respect to the current serving cell and the current listening cell;

[0091] According to the spatial domain parameters of the terminal with respect to the current serving cell and the current listening cell, determine that the terminal has moved into the handover interval between the current serving cell and the current listening cell, and then use the current listening cell as the new current serving cell of the terminal.

[0092] In one embodiment, the spatial domain parameters include time offset and frequency offset; when the processor executes the computer program, the following steps are further implemented: when the current serving cell and the current listening cell are non-collocated cells, determine that the terminal is located in the overlapping area of the current serving cell and the current listening cell according to the time offset between the terminal and the current listening cell, and determine that the terminal is moving away from the current serving cell and approaching the current listening cell according to the frequency offsets between the terminal and the current serving cell and the current listening cell, then use the current listening cell as the new current serving cell of the terminal.

[0093] In one embodiment, the spatial domain parameters include signal-to-noise ratio and frequency offset; when the processor executes the computer program, the following steps are further implemented: when the current serving cell and the current listening cell are collocated cells, determine that the terminal enters the main coverage area of the current listening cell according to the signal-to-noise ratios between the terminal and the current serving cell and the current listening cell, and determine that the terminal is moving away from the current serving cell and the current listening cell according to the frequency offsets between the terminal and the current serving cell and the current listening cell, then use the current listening cell as the new current serving cell of the terminal.

[0094] Optionally, if the current serving cell and the current listening cell share a baseband processing unit, the current listening cell is the cell among the adjacent cells of the current serving cell where the frequency offset from the terminal to the cell is positive.

[0095] Optionally, if the current serving cell and the current listening cell do not share a baseband processing unit, the current listening cell is the cell among the cells of the next baseband processing unit of the baseband processing unit of the current serving cell where the time offset from the terminal to the cell is the smallest and the frequency offset is positive.

[0096] In one embodiment, when the processor executes the computer program, the following steps are further implemented: if the time offset between the terminal and the current listening cell is less than a preset time offset threshold, determine that the terminal is located in the overlapping area of the current serving cell and the current listening cell.

[0097] In one embodiment, when the processor executes the computer program, the following steps are further implemented: if the frequency offset between the terminal and the current serving cell is negative and the frequency offset between the terminal and the current listening cell is positive, determine that the terminal is moving away from the current serving cell and approaching the current listening cell.

[0098] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0099] Monitor the spatial domain parameters of the terminal during movement with respect to the current serving cell and the current listening cell, where the spatial domain parameters are used to represent the spatial offset degree between the terminal and the current serving cell and the current listening cell;

[0100] Based on the spatial domain parameters of the terminal with respect to the current serving cell and the current listening cell, if it is determined that the terminal has moved into the handover interval between the current serving cell and the current listening cell, then the current listening cell is taken as the new current serving cell of the terminal.

[0101] In one embodiment, the spatial domain parameters include time offset and frequency offset; when the computer program is executed by a processor, the following steps are further implemented: in the case where the current serving cell and the current listening cell are non - co - located cells, based on the time offset between the terminal and the current listening cell, it is determined that the terminal is located in the overlapping area between the current serving cell and the current listening cell, and based on the frequency offsets between the terminal and the current serving cell and the current listening cell, it is determined that the terminal is moving away from the current serving cell and approaching the current listening cell, then the current listening cell is taken as the new current serving cell of the terminal.

[0102] In one embodiment, the spatial domain parameters include signal - to - noise ratio and frequency offset; when the computer program is executed by a processor, the following steps are further implemented: in the case where the current serving cell and the current listening cell are co - located cells, based on the signal - to - noise ratios between the terminal and the current serving cell and the current listening cell, it is determined that the terminal has entered the main coverage area of the current listening cell, and based on the frequency offsets between the terminal and the current serving cell and the current listening cell, it is determined that the terminal is moving away from the current serving cell and the current listening cell, then the current listening cell is taken as the new current serving cell of the terminal.

[0103] Optionally, if the current serving cell and the current listening cell share a baseband processing unit, then the current listening cell is the cell among the adjacent cells of the current serving cell where the frequency offset from the terminal to the cell is positive.

[0104] Optionally, if the current serving cell and the current listening cell do not share a baseband processing unit, then the current listening cell is the cell with the smallest time offset and positive frequency offset from the terminal among the cells of the next baseband processing unit of the baseband processing unit of the current serving cell.

[0105] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented: if the time offset between the terminal and the current listening cell is less than a preset time - offset threshold, then it is determined that the terminal is located in the overlapping area between the current serving cell and the current listening cell.

[0106] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented: if the frequency offset between the terminal and the current serving cell is negative and the frequency offset between the terminal and the current listening cell is positive, then it is determined that the terminal is moving away from the current serving cell and approaching the current listening cell.

[0107] The cell handover device, communication device, and storage medium provided in the above embodiments can execute the cell handover method provided in any embodiment of the present application, and have corresponding functional modules and beneficial effects for executing the method. For technical details not described in detail in the above embodiments, reference may be made to the cell handover method provided in any embodiment of the present application.

[0108] As described above, the above are only exemplary embodiments of the present application and are not used to limit the protection scope of the present application.

[0109] Generally speaking, various embodiments of the present application can be implemented in hardware or dedicated circuits, software, logic, or any combination thereof. For example, some aspects can be implemented in hardware, while other aspects can be implemented in firmware or software that can be executed by a controller, microprocessor, or other computing device, although the present application is not limited thereto.

[0110] Embodiments of the present application can be implemented by a data processor of a mobile device executing computer program instructions, for example, in a processor entity, or by hardware, or by a combination of software and hardware. The computer program instructions can be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages.

[0111] Any block diagram of a logical process in the drawings of the present application can represent program steps, or can represent interconnected logical circuits, modules, and functions, or can represent a combination of program steps and logical circuits, modules, and functions. The computer program can be stored in a memory. The memory can have any type suitable for the local technical environment and can be implemented using any suitable data storage technology, such as but not limited to read-only memory (ROM), random access memory (RAM), optical memory devices and systems (digital versatile disc DVD or CD disc), etc. The computer-readable medium can include a non-transitory storage medium. The data processor can be any type suitable for the local technical environment, such as but not limited to a general-purpose computer, a dedicated computer, a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), and a processor based on a multi-core processor architecture.

[0112] Through exemplary and non-limiting examples, a detailed description of the exemplary embodiments of the present application has been provided above. However, considering the accompanying drawings and the claims, various modifications and adjustments to the above embodiments will be obvious to those skilled in the art without departing from the scope of the present invention. Therefore, the proper scope of the present invention will be determined according to the claims.

Claims

1. A cell handover method, characterized in that, Including: Monitoring the spatial domain parameters of the terminal during movement with respect to the current serving cell and the current listening cell, where the spatial domain parameters are used to represent the spatial offset degree between the terminal and the current serving cell and the current listening cell; the spatial domain parameters include time offset and frequency offset; According to the spatial domain parameters of the terminal with respect to the current serving cell and the current listening cell, when it is determined that the terminal has moved into the handover interval between the current serving cell and the current listening cell, then taking the current listening cell as the new current serving cell of the terminal, including: When the current serving cell and the current listening cell are non - co - located cells, based on the time offset between the terminal and the current listening cell, determining that the terminal is located in the overlapping area between the current serving cell and the current listening cell, and based on the frequency offsets between the terminal and the current serving cell and the current listening cell, determining that the terminal is moving away from the current serving cell and approaching the current listening cell, then taking the current listening cell as the new current serving cell of the terminal; Wherein, if the current serving cell and the current listening cell share a baseband processing unit, then the current listening cell is the cell among the adjacent cells of the current serving cell where the frequency offset from the terminal to the cell is positive; The overlapping area should meet the following conditions: The length of the overlapping area should satisfy Djd > v * Tsrs, where Djd is the length of the overlapping area, Tsrs is the transmission period of SRS, and v is the train speed; The distances from the two ends of the overlapping area to the two adjacent cells should satisfy |Dj1 - Dj2| < c * Tcp, |Dd1 - Dd2| < c * Tcp, where Dj1 is the distance from the first end of the two ends of the overlapping area to the first cell among the two adjacent cells, Dj2 is the distance from the first end of the two ends of the overlapping area to the second cell among the two adjacent cells, Dd1 is the distance from the second end of the two ends of the overlapping area to the first cell, Dd2 is the distance from the second end of the two ends of the overlapping area to the second cell, Tcp is the cyclic prefix CP length, and c is the speed of light; The distances from the center point of the overlapping area to the two adjacent cells are the same.

2. The method according to claim 1, wherein The spatial domain parameters include signal - to - noise ratio and frequency offset; the step of, according to the spatial domain parameters of the terminal with respect to the current serving cell and the current listening cell, determining that the terminal has moved into the handover interval between the current serving cell and the current listening cell, and then taking the current listening cell as the new current serving cell of the terminal, includes: When the current serving cell and the current listening cell are co - located cells, based on the signal - to - noise ratios between the terminal and the current serving cell and the current listening cell, determining that the terminal has entered the main coverage range of the current listening cell, and based on the frequency offsets between the terminal and the current serving cell and the current listening cell, determining that the terminal is moving away from the current serving cell and the current listening cell, then taking the current listening cell as the new current serving cell of the terminal.

3. The method according to claim 1 or 2, characterized in that, If the current serving cell and the current listening cell do not share a baseband processing unit, then the current listening cell is the cell among the cells of the next baseband processing unit of the baseband processing unit of the current serving cell, where the time offset from the terminal to the cell is the smallest and the frequency offset is positive.

4. The method according to claim 1, wherein Determining that the terminal is located in the overlapping area of the current serving cell and the current listening cell according to the time offset between the terminal and the current listening cell includes: If the time offset between the terminal and the current listening cell is less than a preset time offset threshold, it is determined that the terminal is located in the overlapping area of the current serving cell and the current listening cell.

5. The method according to claim 1, wherein Determining that the terminal is moving away from the current serving cell and approaching the current listening cell according to the frequency offset between the terminal and the current serving cell and the current listening cell includes: If the frequency offset between the terminal and the current serving cell is negative and the frequency offset between the terminal and the current listening cell is positive, it is determined that the terminal is moving away from the current serving cell and approaching the current listening cell.

6. A cell handover device, characterized in that, Applied to a cell handover method according to any one of claims 1-5, the device includes: A monitoring module for monitoring the spatial domain parameters of the terminal with respect to the current serving cell and the current listening cell during the movement of the terminal, where the spatial domain parameters are used to represent the spatial offset degree of the terminal with respect to the current serving cell and the current listening cell; the spatial domain parameters include time offset and frequency offset; A handover module for, when the current serving cell and the current listening cell are non-collocated cells, determining that the terminal is located in the overlapping area of the current serving cell and the current listening cell according to the time offset between the terminal and the current listening cell, and determining that the terminal is moving away from the current serving cell and approaching the current listening cell according to the frequency offset between the terminal and the current serving cell and the current listening cell, and then using the current listening cell as the new current serving cell of the terminal; Wherein, if the current serving cell and the current listening cell share a baseband processing unit, the current listening cell is the cell among the adjacent cells of the current serving cell where the frequency offset from the terminal to the cell is positive; The overlapping area should meet the following conditions: The length of the overlapping area should satisfy Djd > v * Tsrs, where Djd is the length of the overlapping area, Tsrs is the transmission period of SRS, and v is the train speed; The distances from the two ends of the overlapping area to the two adjacent cells should satisfy |Dj1 - Dj2| < c * Tcp, |Dd1 - Dd2| < c * Tcp, where Dj1 is the distance from the first end of the two ends of the overlapping area to the first cell among the two adjacent cells, Dj2 is the distance from the first end of the two ends of the overlapping area to the second cell among the two adjacent cells, Dd1 is the distance from the second end of the two ends of the overlapping area to the first cell, Dd2 is the distance from the second end of the two ends of the overlapping area to the second cell, Tcp is the cyclic prefix CP length, and c is the speed of light; The distances from the center point of the overlapping area to the two adjacent cells are the same.

7. A communication device, comprising a memory and a processor, the memory storing a computer program, characterized in that, When the processor executes the computer program, it implements the steps of a cell handover method according to any one of claims 1-5.

8. A storage medium, characterized in that, The storage medium stores a computer program, and when the computer program is executed by the processor, it implements the steps of a cell handover method according to any one of claims 1-5.

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