Cell handover method and apparatus, access network device, electronic device, and storage medium

Abstract

Embodiments of the present application provide a cell switching method and device, an access network device, an electronic device and a storage medium, and relate to the technical field of communication. The method comprises: if it is determined that the load of an inter-frequency cell does not meet a first preset condition, obtaining a signal quality threshold for inter-frequency measurement or inter-frequency switching of a terminal based on user throughput; if the source cell of the terminal is a higher frequency cell, instructing the terminal to start and perform inter-frequency measurement according to the signal quality of the terminal in the source cell being lower than the signal quality threshold; and if it is determined that an inter-frequency handover measurement report reported by the terminal after performing inter-frequency measurement meets a preset handover condition, switching the terminal to a lower frequency cell. The embodiments of the present application can not only exert the large capacity advantage of a high frequency cell, but also exert the coverage preservation advantage of a low frequency cell, thereby ensuring the stability of user throughput without affecting coverage, and further improving system capacity.

Description

Technical Field

[0001] This application relates to the field of communication technology, and more specifically, to a cell handover method, apparatus, access network equipment, electronic equipment, and storage medium. Background Technology

[0002] Existing network deployments primarily employ a single-layer network structure, meaning that only one frequency point exists within the same coverage area and system. Cell reselection and handover in a single-layer network are mainly based on coverage or load.

[0003] For handover based on coverage, intra-frequency measurement and inter-frequency measurement for high-priority frequencies are always enabled. Inter-frequency measurement for low-priority frequencies is only enabled when the A2 event is met, and the enabling threshold is based on coverage settings. When the signal quality of the serving cell and / or the signal quality of neighboring cells meet certain events, such as the A3 event, handover measurement reporting is triggered, thereby triggering cell handover.

[0004] Based on load, cell handover is triggered when the source cell has a heavy load or when there is a load imbalance between the source and target cells.

[0005] For coverage-based handover, users will only access lower frequency bands when coverage is limited. For individual cells, higher frequency cells can support more users, but resources are limited, preventing them from fully utilizing their large capacity advantages, while lower frequency cells have less load and waste resources.

[0006] For load-based handover, users are handed over to the optimal cell simply because of heavy load, which increases the number of handovers and the handover failure rate.

[0007] Therefore, existing technologies are only applicable to single-layer networks, but not to multi-layer networks. Summary of the Invention

[0008] This application provides a cell handover method, apparatus, access network equipment, electronic equipment, and storage medium that overcomes or at least partially solves the above-mentioned problems.

[0009] In a first aspect, a cell handover method for a multi-layer network is provided, wherein the multi-layer network includes at least one higher-frequency cell and at least one lower-frequency cell, the method comprising:

[0010] If it is determined that the load of the inter-frequency cell does not meet the first preset condition, then the signal quality threshold for inter-frequency measurement or inter-frequency handover is obtained based on the user throughput acquisition terminal.

[0011] If the source cell of the terminal is a higher frequency cell, the terminal is instructed to start and perform inter-frequency measurement based on the fact that the signal quality of the terminal in the source cell is lower than the signal quality threshold.

[0012] If the inter-frequency switching report reported by the terminal after performing inter-frequency measurement meets the preset switching conditions, the terminal is switched to a lower frequency cell.

[0013] In one possible implementation, the signal quality threshold for inter-frequency handover by the terminal is obtained, followed by:

[0014] If the terminal's source cell is a lower-frequency cell, then the terminal will be switched to the higher-frequency cell if the signal quality of the higher-frequency cell is higher than a signal quality threshold.

[0015] In one possible implementation, if the source cell of the terminal is a lower frequency cell, the method further includes:

[0016] The terminal is instructed to perform inter-frequency measurement. If the inter-frequency handover measurement report reported by the terminal after performing the inter-frequency measurement meets the preset handover conditions, the terminal is then switched to a lower frequency cell.

[0017] In one possible implementation, the terminal is instructed to perform inter-frequency measurements, followed by:

[0018] If a same-frequency handover measurement report is received from the terminal, and the load of the different-frequency cell meets the second preset condition, then the terminal will be switched to the same-frequency cell.

[0019] In one possible implementation, if a same-frequency handover measurement report is received from the terminal, the following steps are also included:

[0020] If the load of the inter-frequency cell does not meet the second preset condition, then determine whether the terminal should enable inter-frequency measurement.

[0021] If it is determined that the terminal has enabled inter-frequency measurement, then switch the terminal to the same-frequency cell.

[0022] In one possible implementation, the process includes determining whether the terminal has enabled inter-frequency measurement, followed by:

[0023] If it is determined that the terminal has not enabled inter-frequency measurement, then instruct the terminal to enable inter-frequency measurement;

[0024] If a frequency handover measurement report is received from the terminal within a preset time, the terminal will be switched to the frequency cell.

[0025] If no inter-frequency handover measurement report is received from the terminal within the preset time, the terminal will be switched to a cell with the same frequency.

[0026] In one possible implementation, the signal quality threshold for inter-frequency handover of the terminal is obtained, including:

[0027] Based on the principle that the user throughput remains unchanged before and after the handover, the signal quality threshold for the terminal to perform inter-frequency handover is determined by combining the bandwidth and stream count of the terminal in the higher frequency cell and the lower frequency cell respectively.

[0028] In one possible implementation, the method also includes:

[0029] If it is determined that the load of the inter-frequency cell meets the first preset condition, then the signal quality threshold for inter-frequency measurement or inter-frequency handover is based on the coverage acquisition terminal.

[0030] In one possible implementation, the first preset condition is that the load of the inter-frequency cell is greater than the load of the source cell and the load difference between the inter-frequency cell and the source cell exceeds the first preset load threshold.

[0031] In one possible implementation, the second preset condition is that the load of the inter-frequency cell is greater than the load of the same-frequency cell, and the load difference between the same-frequency cell and the inter-frequency cell exceeds the second preset load threshold.

[0032] Secondly, a cell handover apparatus for a multi-layer network is provided, wherein the multi-layer network includes at least one higher-frequency cell and at least one lower-frequency cell, and the apparatus includes:

[0033] The first signal threshold determination module is used to determine the signal quality threshold for inter-frequency measurement or inter-frequency handover based on the user throughput acquisition terminal if the load of the inter-frequency cell does not meet the first preset condition.

[0034] The inter-frequency measurement activation module is used to instruct the terminal to activate and perform inter-frequency measurement if the source cell of the terminal is a higher frequency cell, based on the fact that the signal quality of the terminal in the source cell is lower than the signal quality threshold.

[0035] The first handover module is used to switch the terminal to a lower frequency cell if the inter-frequency handover measurement report reported by the terminal after performing inter-frequency measurement meets the preset handover conditions.

[0036] In one possible implementation, the cell handover device also includes:

[0037] The second handover module is used to hand over the terminal to a higher-frequency cell if the terminal's source cell is a lower-frequency cell, based on the signal quality of the higher-frequency cell being higher than a signal quality threshold.

[0038] In one possible implementation, the cell handover device also includes:

[0039] The third handover module is used to instruct the terminal to perform inter-frequency measurement if the source cell of the terminal is a lower frequency cell. If the inter-frequency handover measurement report reported by the terminal after performing the inter-frequency measurement meets the preset handover conditions, the terminal is then switched to the lower frequency cell.

[0040] In one possible implementation, the cell handover device also includes:

[0041] The fourth handover module is used to switch the terminal to the same frequency cell if it receives a same-frequency handover measurement report from the terminal and the load of the different-frequency cell meets the second preset condition.

[0042] In one possible implementation, the cell handover device also includes:

[0043] The fifth switching module is used to determine whether the terminal has enabled inter-frequency measurement if the load of the inter-frequency cell does not meet the second preset condition; if it is determined that the terminal has enabled inter-frequency measurement, the terminal is switched to the same-frequency cell.

[0044] In one possible implementation, the cell handover device also includes:

[0045] The inter-frequency measurement indication module is used to instruct the terminal to enable inter-frequency measurement if it is determined that the terminal has not enabled inter-frequency measurement.

[0046] The sixth handover module is used to switch the terminal to an inter-frequency cell if an inter-frequency handover measurement report is received from the terminal within a preset time; and to switch the terminal to a cell with the same frequency if no inter-frequency handover measurement report is received from the terminal within a preset time.

[0047] In one possible implementation, the first signal threshold determination module is specifically used for:

[0048] Based on the principle that the user throughput remains unchanged before and after the handover, and taking into account the bandwidth and stream count of the terminal in the higher frequency cell and the lower frequency cell respectively, the signal quality threshold for the terminal to perform inter-frequency measurement or inter-frequency handover is determined.

[0049] In one possible implementation, the cell handover device also includes:

[0050] The second signal threshold determination module is used to determine the signal quality threshold for inter-frequency measurement or inter-frequency handover based on the coverage acquisition terminal if the load of the inter-frequency cell is determined to meet the first preset condition.

[0051] Thirdly, embodiments of this application provide an access network device, including a memory, a transceiver, and a processor:

[0052] A memory for storing computer programs; a transceiver for sending and receiving data under the control of a processor; and a processor for reading the computer programs from the memory and executing the steps of the method provided in the first aspect.

[0053] Fourthly, embodiments of this application provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the method provided in the first aspect.

[0054] Fifthly, embodiments of this application provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method provided in the first aspect.

[0055] In a sixth aspect, embodiments of this application provide a computer program that includes computer instructions stored in a computer-readable storage medium. When a processor of a computer device reads the computer instructions from the computer-readable storage medium, the processor executes the computer instructions, causing the computer device to perform steps that implement the method provided in the first aspect.

[0056] The cell handover method, apparatus, access network equipment, electronic equipment, and storage medium provided in this application determine that the load of the inter-frequency cell does not meet a first preset condition. Based on the user throughput, the signal quality threshold for the terminal to perform inter-frequency measurement or inter-frequency handover is obtained. When the source cell of the terminal is a higher frequency cell, the signal quality of the terminal's source cell is lower than the signal quality threshold, instructing the terminal to start inter-frequency measurement. If it is determined that the inter-frequency handover measurement report reported by the terminal after starting inter-frequency measurement meets the preset handover conditions, the terminal is switched to a lower frequency cell. This allows users to obtain the same user throughput after inter-frequency handover, leveraging both the high capacity advantage of high-frequency cells and the coverage advantage of low-frequency cells. Without affecting coverage, the stability of user throughput is guaranteed, thereby improving system capacity. Attached Figure Description

[0057] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below.

[0058] Figure 1 A schematic architecture diagram of a communication system provided in this application embodiment;

[0059] Figure 2 This is a flowchart illustrating a cell handover method for a multi-layer network according to an embodiment of this application.

[0060] Figure 3 This is a flowchart illustrating a cell handover method according to another embodiment of this application;

[0061] Figure 4 This is a flowchart illustrating a cell handover method according to another embodiment of this application;

[0062] Figure 5 This is a schematic diagram of the structure of a cell handover device for a multi-layer network according to an embodiment of this application;

[0063] Figure 6 This is a schematic diagram of the structure of the access network device according to an embodiment of this application;

[0064] Figure 7 A schematic diagram of user distribution in a multi-layer network according to an embodiment of this application;

[0065] Figure 8 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0066] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0067] Those skilled in the art will understand that, unless explicitly stated otherwise, the singular forms “a,” “an,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in the specification of this application means the presence of features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or wireless coupling. The term “and / or” as used herein includes all or any units and all combinations of one or more associated listed items.

[0068] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0069] First, let's introduce and explain several terms used in this application:

[0070] (1) Multi-layer network: refers to a network formed within the same mobile communication system and the same coverage area, using multiple higher and lower frequency points. Cells with higher frequency points usually have larger bandwidth, so they can be used to meet capacity requirements, where capacity refers to the throughput of users and cells. Cells with lower frequency points have larger radii, so they can be used to meet coverage requirements. Different frequency points are used for different purposes, forming a multi-layer network under shared coverage.

[0071] (2) A cell, also known as a cellular cell, refers to the area covered by one base station or part of a base station (fan antenna) in a cellular mobile communication system, in which a mobile station can reliably communicate with the base station through a wireless channel.

[0072] (3) Handover is the process by which a terminal, in RRC connection state, switches from one cell to an adjacent cell. This process is called "handover". Inter-cell handover in mobile communication systems refers to the migration of the radio link connection from the source cell to the target cell under the control of the radio access network. It is a basic technical means to ensure seamless mobile communication services and to exchange an ongoing call between different cell radio channels without interrupting it.

[0073] When a terminal is in a service connection state and maintains service, it moves from one cell to another. The original serving cell can no longer provide service to the terminal. In order to avoid service interruption, the radio bearer system will find the most suitable cell or network to provide continued service to the terminal, realizing mobility management with seamless wireless network coverage. This is cell handover.

[0074] (4) Same-frequency handover: The target cell and the current serving cell use the same radio frequency carrier frequency. After the terminal establishes an RRC connection with the base station, the base station will immediately notify the terminal to perform same-frequency neighbor cell measurement (which also includes the measurement of the cell reference signal of the current serving cell itself) through an RRC reconfiguration message.

[0075] (5) Inter-frequency handover: The target cell and the current serving cell use different radio frequency carrier frequencies. Handover between different frequencies or systems is the most complex and can be broadly divided into two categories:

[0076] 1) Blind handover: The base station needs to tell the terminal which target neighboring cell to switch to.

[0077] 2) Based on inter-frequency measurement report: The base station needs to tell the terminal which inter-frequency target cell to measure.

[0078] (6) Classification of inter-frequency switching

[0079] Inter-frequency handover is categorized into seven events: A1–A5, B1, and B2. Specifically:

[0080] An A1 event occurs when the serving cell signal quality exceeds a corresponding threshold, causing the eNodeB to stop inter-frequency / inter-system measurements. However, in frequency-priority-based handovers, the A1 event is used to initiate inter-frequency measurements.

[0081] An A2 event occurs when the serving cell signal quality falls below a corresponding threshold, prompting the eNodeB to initiate inter-frequency / inter-system measurements. However, in frequency-priority-based handovers, the A2 event is used to initiate inter-frequency measurements.

[0082] In the A3 event, the neighboring cell's signal quality was better than the server cell's signal quality, prompting the source eNodeB to initiate a same-frequency / different-frequency handover request.

[0083] A4 event: The signal quality of the neighboring cell is higher than the corresponding threshold, and the source eNodeB initiates an inter-frequency handover request.

[0084] In the A5 event, the signal quality of the serving cell is lower than threshold 1, while the signal quality of the neighboring cell is higher than threshold 2, and the source eNodeB initiates an inter-frequency handover request.

[0085] B1 event: The signal quality of a neighboring cell in a different system is higher than the corresponding threshold, and the source eNodeB initiates an inter-frequency handover request.

[0086] In the B2 event, the signal quality of the serving cell is below threshold 1, while the signal quality of the neighboring cell in the other system is above threshold 2, and the source eNodeB initiates an inter-frequency handover request.

[0087] (7) Centralized Unit (CU) mainly includes non-real-time wireless high-layer protocol stack functions, and also supports the sinking of some core network functions and the deployment of edge application services.

[0088] (8) Distributed Unit (DU): This unit primarily handles physical layer functions and layer 2 functions that require real-time processing. To save transmission resources between the remote radio unit (RF unit) and the DU, some physical layer functions can also be moved up to the RF unit.

[0089] The cell handover method, apparatus, electronic device, and computer-readable storage medium for multi-layer networks provided in this application are intended to solve the above-mentioned technical problems of the prior art.

[0090] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0091] Figure 1 This is a schematic architecture diagram of a communication system according to an embodiment of this application.

[0092] The base station provided in this application embodiment can be a base station (Node B, NB) under Universal Mobile Telecommunications System (UMTS), an evolved Node B (eNB) under Long Term Evolution (LTE), or a base station or controller under 5G mobile communication system.

[0093] The user equipment (also called a terminal) involved in the embodiments of this application can be a device that provides voice and / or data connectivity to a user, a handheld device with wireless connectivity, or other processing devices connected to a wireless modem. The name of the terminal device may differ in different systems; for example, in a 5G system, the terminal device can be called User Equipment (UE). Wireless terminal devices can communicate with one or more core networks (CNs) via a Radio Access Network (RAN). Wireless terminal devices can be mobile terminal devices, such as mobile phones (or "cellular" phones) and computers with mobile terminal devices, for example, portable, pocket-sized, handheld, computer-embedded, or vehicle-mounted mobile devices that exchange voice and / or data with the radio access network. Examples include Personal Communication Service (PCS) phones, cordless phones, Session Initiated Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). Wireless terminal equipment can also be referred to as a system, subscriber unit, subscriber station, mobile station, mobile station, remote station, access point, remote terminal, access terminal, user terminal, user agent, or user device, but this application does not limit the terminology.

[0094] Furthermore, the technical solutions provided in this application can be applied to various systems, especially 5G systems. For example, applicable systems may include Global System for Mobile Communication (GSM), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (GPRS), Long Term Evolution (LTE), LTE Frequency Division Duplex (FDD), LTE Time Division Duplex (TDD), Long Term Evolution Advanced (LTE-A), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX), and 5G New Radio (NR). All of these systems include terminal equipment and network equipment. The systems may also include a core network component, such as Evolved Packet System (EPS) and 5G system (5GS).

[0095] This application proposes a cell handover method for multi-layer networks. This method can avoid cell reselection and handover triggered by load imbalance, while also ensuring that users obtain the maximum throughput.

[0096] The multi-layer network of this application embodiment includes at least one higher-frequency cell and at least one lower-frequency cell. It is understood that the frequency of the higher-frequency cell is higher than that of the lower-frequency cell. Taking the 2.6GHz and 700MHz frequencies commonly used by operators as an example, the frequency of the higher-frequency cell is 2.6GHz, and the frequency of the lower-frequency cell is 700MHz. The 2.6GHz cell (i.e., the higher-frequency cell) is in TDD mode, with an uplink / downlink subframe ratio of 7.4:2.3, and shares a 100MHz bandwidth for both uplink and downlink, serving as the capacity layer. The 700MHz cell (i.e., the lower-frequency cell) is in FDD mode, with 30MHz bandwidth for both uplink and downlink, serving as the coverage layer.

[0097] Because the coverage area of ​​a 700MHz cell is three times that of a 2.6GHz cell, the two are deployed at a 1:3 ratio, meaning that the multi-layer network includes one 2.6GHz cell and three 700MHz cells. It should be noted that the deployment ratio and frequency of the higher-frequency and lower-frequency cells described above are merely examples, and this application does not impose specific limitations on the deployment ratio and frequency of the higher-frequency and lower-frequency cells.

[0098] Since multi-layer networks involve information exchange between multiple cells, a CU-DU separation architecture with centralized management is more advantageous. Obtaining the load information of multiple cells requires a certain transmission latency, which has a significant impact on handover performance. Therefore, the execution entity in this application embodiment can be the CU, and further, the CU can obtain the load information of other cells in advance and perform periodic updates.

[0099] Please see Figure 2 The figure illustrates a flowchart of a cell handover method for a multi-layer network according to an embodiment of this application, as shown in the figure, including:

[0100] S101. If it is determined that the load of the inter-frequency cell does not meet the first preset condition, then the signal quality threshold for inter-frequency measurement or inter-frequency handover is obtained based on the user throughput acquisition terminal.

[0101] In this embodiment, higher frequency cells typically have larger bandwidth, thus meeting capacity requirements, while lower frequency cells have larger radii, meeting coverage requirements. This embodiment can pre-prioritize 2.6GHz and lower 700MHz, ensuring users have priority access to 2.6GHz cells and enjoy their larger capacity.

[0102] In this embodiment of the application, in step S101, it is first determined whether the load of the inter-frequency cell meets the first preset condition. The inter-frequency cell is a cell with a different frequency than the source cell. If the source cell of the terminal is a 2.6GHz cell, then the inter-frequency cell refers to a 700MHz cell. If the source cell of the terminal is a 700MHz cell, then the inter-frequency cell is a 2.6GHz cell.

[0103] The first preset condition is that the load of the inter-frequency cell is greater than the load of the source cell, and the load difference between the inter-frequency cell and the source cell exceeds a first preset load threshold. This application embodiment does not specifically limit the size of the first preset load threshold.

[0104] If the load of the inter-frequency cell meets the first preset condition, the source cell in this application embodiment uses the initial inter-frequency measurement threshold and inter-frequency handover threshold to guide the terminal to perform coverage-based handover. In this application embodiment, the initial inter-frequency measurement threshold of the higher frequency cell and the initial audio handover threshold of the lower frequency cell are both set based on coverage.

[0105] If the load of the inter-frequency cell does not meet the first preset condition, this application obtains the signal quality threshold for the terminal to perform inter-frequency measurement or inter-frequency handover based on user throughput. It should be understood that, considering that when the load of the inter-frequency cell does not meet the first preset condition, the terminal has not yet entered the weak coverage area of ​​the higher-frequency cell, but if switching to the lower-frequency cell can obtain higher user throughput, the terminal can perform handover based on throughput. Since the lower-frequency cell has a lower frequency priority, an enabling threshold for inter-frequency measurement needs to be set. That is, when the source cell is a higher-frequency cell, the signal quality threshold for the terminal to perform inter-frequency measurement is determined based on user throughput; when the source cell is a lower-frequency cell, the signal quality threshold for the terminal to perform inter-frequency handover is determined based on user throughput.

[0106] Specifically, in this application embodiment, the user throughput remains unchanged before and after the handover. The signal quality threshold for the terminal to perform inter-frequency handover is determined by combining the bandwidth and stream count of the terminal in the higher frequency cell and the lower frequency cell, respectively.

[0107] The terminal capability limits the maximum number of streams to 2T4R for 2.6GHz terminals and 1T2R for 700MHz terminals. The actual number of streams is determined based on signal quality. Therefore, the signal quality threshold for the terminal in a 2.6GHz cell can be calculated using the following formula, ensuring that the terminal achieves the same user throughput regardless of whether it accesses a 2.6GHz or 700MHz cell:

[0108] Terminal bandwidth in 2.6GHz cell * number of user streams in 2.6GHz cell * log2(1+SINR) = Terminal bandwidth in 700MHz cell * number of terminal streams in 700MHz cell * log2(1+SINR+D).

[0109] SINR represents the signal quality threshold, and D represents the preset signal quality increment, which are known quantities. The bandwidth and number of streams of the terminal in higher frequency cells (2.6GHz cells) and lower frequency cells (700MHz cells) can be obtained in advance by the CU, which are also known quantities. Therefore, the information quality threshold can be obtained through the above formula.

[0110] S102. If the source cell of the terminal is a higher frequency cell, then based on the fact that the signal quality of the terminal in the source cell is lower than the signal quality threshold, the terminal is instructed to start and perform inter-frequency measurement.

[0111] S103. If it is determined that the inter-frequency handover measurement report reported by the terminal after performing inter-frequency measurement meets the preset handover conditions, then the terminal is switched to a lower frequency cell.

[0112] When the source cell signal quality of the terminal is lower than the signal quality threshold, the terminal is instructed to start inter-frequency measurement. After starting inter-frequency measurement, the terminal may report a same-frequency handover measurement report or an inter-frequency measurement report. When the inter-frequency handover measurement report reported by the terminal meets the preset conditions, such as the occurrence of an A3 event, the terminal switches to the lower frequency cell.

[0113] The cell handover method for multi-layer networks in this application determines that the load of the inter-frequency cell does not meet a first preset condition. Based on the user throughput, it obtains the signal quality threshold for the terminal to perform inter-frequency measurement or inter-frequency handover. When the source cell of the terminal is a higher frequency cell, the signal quality of the source cell of the terminal is lower than the signal quality threshold, and the terminal is instructed to start inter-frequency measurement. If it is determined that the inter-frequency handover measurement report reported by the terminal after starting inter-frequency measurement meets the preset handover conditions, the terminal is switched to a lower frequency cell. This allows the user to obtain the same user throughput after inter-frequency handover, which can give full play to the high capacity advantage of high frequency cells and the coverage advantage of low frequency cells. Without affecting coverage, it ensures the stability of user throughput and thus improves system capacity.

[0114] Based on the above embodiments, as an optional embodiment, the signal quality threshold for inter-frequency handover of the terminal is obtained, and then the method further includes:

[0115] If the source cell of the terminal is a lower frequency cell, the terminal will be switched to the higher frequency cell if the signal quality of the higher frequency cell is higher than the signal quality threshold.

[0116] It should be noted that, in order to take advantage of the large capacity of higher frequency cells, in this embodiment of the application, regardless of the signal quality of the source cell being a lower frequency cell, as long as the signal quality of the higher frequency cell meets the requirements, that is, is higher than the signal quality threshold, the terminal will be switched to the higher frequency cell.

[0117] Based on the above embodiments, as an optional embodiment, for terminals whose source cell is a lower frequency cell, inter-frequency measurement is always enabled. Therefore, if the source cell of the terminal is a lower frequency cell, the method further includes: instructing the terminal to perform inter-frequency measurement. Furthermore, if it is determined that the inter-frequency handover measurement report reported by the terminal after performing inter-frequency measurement meets the preset handover conditions, the terminal is switched to the lower frequency cell.

[0118] Please see Figure 3 The figure illustrates a flowchart of another embodiment of the cell handover method of this application, as shown in the figure, which includes:

[0119] S201. Determine whether the load of the inter-frequency cell meets the first preset condition. If yes, proceed to step S202; otherwise, proceed to step S203.

[0120] S202, based on the signal quality threshold for inter-frequency measurement or inter-frequency switching performed by the coverage acquisition terminal, execute step S204;

[0121] S203. Signal quality threshold for inter-frequency measurement or inter-frequency switching based on user throughput acquisition terminal;

[0122] S204. Determine whether the source cell of the terminal is a higher frequency cell. If yes, proceed to step S205; otherwise, proceed to step S207.

[0123] S205. If the signal quality of the terminal in the source cell is lower than the signal quality threshold, instruct the terminal to start inter-frequency measurement;

[0124] S206. If it is determined that the inter-frequency handover measurement report reported by the terminal after enabling inter-frequency measurement meets the preset handover conditions, then the terminal is switched to a lower frequency cell, and the handover process ends.

[0125] S207. If the signal quality of the higher frequency cell is higher than the signal quality threshold, the terminal is switched to the higher frequency cell. Alternatively, if the inter-frequency handover measurement report reported by the terminal after performing inter-frequency measurement meets the preset handover conditions, the terminal is switched to the lower frequency cell, and the handover process ends.

[0126] Based on the above embodiments, as an optional embodiment, after instructing the terminal to perform inter-frequency measurement, the method further includes:

[0127] If a same-frequency handover measurement report is received from the terminal, and the load of the cell with a different frequency than the source cell meets the second preset condition, then the terminal is switched to the same-frequency cell with the same frequency as the source cell.

[0128] It should be understood that this embodiment is applicable to both higher frequency and lower frequency source cells. When the CU instructs the terminal to start inter-frequency measurement, in addition to receiving an inter-frequency handover measurement report, it may also receive a same-frequency handover measurement report. It should be understood that receiving a same-frequency handover measurement report often means that the terminal intends to perform same-frequency handover. However, when the CU receives a same-frequency handover measurement report in this application, it will not directly switch the terminal to the same-frequency cell, but will further determine whether the load of the inter-frequency cell meets the second preset condition. If it does, the terminal will be switched to the same-frequency cell.

[0129] The second preset condition in this application embodiment is that the load of the inter-frequency cell is greater than the load of the same-frequency cell and the load difference between the same-frequency cell and the inter-frequency cell exceeds the second preset load threshold. Since the probability of the second preset condition occurring is significantly lower than the probability of it not occurring, this application embodiment is actually encouraging users who are switching to the same frequency to prioritize switching to the inter-frequency cell.

[0130] The second preset load threshold in this application embodiment may be equal to or different from the first preset load threshold. This application does not impose specific limitations on the specific values ​​of the two preset load thresholds.

[0131] Based on the above embodiments, as an optional embodiment, if a same-frequency handover measurement report is received from the terminal, the process further includes:

[0132] If the load of the inter-frequency cell does not meet the second preset condition, then determine whether the terminal should enable inter-frequency measurement.

[0133] If it is determined that the terminal has enabled inter-frequency measurement, then switch the terminal to the same-frequency cell.

[0134] It should be noted that if the CU determines that the terminal has enabled inter-frequency measurement, but still receives the same-frequency handover measurement report for the terminal (no inter-frequency handover measurement report received), it means that the inter-frequency cell does not meet the handover conditions, and the terminal will be handed over to the same frequency.

[0135] Based on the above embodiments, as an optional embodiment, after determining whether the terminal has enabled inter-frequency measurement, the method further includes:

[0136] If it is determined that the terminal has not enabled inter-frequency measurement, then instruct the terminal to enable inter-frequency measurement;

[0137] If a frequency handover measurement report is received from the terminal within a preset time, the terminal will be switched to the frequency cell.

[0138] If no inter-frequency handover measurement report is received from the terminal within the preset time, the terminal will be switched to a cell with the same frequency.

[0139] In this embodiment of the application, after instructing the terminal to enable inter-frequency measurement, a timer is set. If an inter-frequency handover measurement report is received before the timer expires, an inter-frequency handover is performed. If no inter-frequency handover measurement report is received, the CU immediately sends a handover request to the target cell of the same frequency to perform a same-frequency handover.

[0140] Please see Figure 4 The figure illustrates a flowchart of a cell handover method according to another embodiment of the present application, as shown in the figure, which includes:

[0141] S301. Determine whether the load of the inter-frequency cell meets the first preset condition. If it does, proceed to step S302; if it does not, proceed to step S303.

[0142] S302. Based on the signal quality threshold for inter-frequency measurement or inter-frequency switching performed by the coverage acquisition terminal, execute step S304.

[0143] S303, Signal quality threshold for inter-frequency measurement or inter-frequency switching based on user throughput acquisition terminal;

[0144] S304. Determine whether the source cell of the terminal is a higher frequency cell; if yes, proceed to step S305; if no, proceed to step S306.

[0145] S305. If the signal quality of the terminal in the source cell is lower than the signal quality threshold, instruct the terminal to start inter-frequency measurement;

[0146] S306. Determine whether an inter-frequency measurement report or a same-frequency measurement report has been received; if an inter-frequency measurement report is received, proceed to step S307; if a same-frequency measurement report is received, proceed to step S308.

[0147] S307. If the inter-frequency handover measurement report is determined to meet the preset handover conditions, the handover terminal is switched to the inter-frequency cell, and the cell handover process ends.

[0148] S308. Determine whether the load of the inter-frequency cell meets the second preset condition. If yes, proceed to step S309; ​​otherwise, proceed to step S310.

[0149] S309. Switch the terminal to the same frequency cell, end;

[0150] S310. Determine whether the terminal has enabled inter-frequency measurement. If yes, proceed to step S309; ​​otherwise, proceed to S311.

[0151] S311. Instruct the terminal to start inter-frequency measurement and set the timer;

[0152] S312. Determine whether a frequency switching measurement report has been received before the timer expires. If yes, proceed to step S309; ​​otherwise, proceed to step S313.

[0153] S313. Switch the terminal to a different frequency cell. This cell handover process is now complete.

[0154] This application provides a cell handover device for a multi-layer network, such as... Figure 5 As shown, the device may include: a first signal threshold determination module 101, a different frequency measurement activation module 102, and a first switching module 103, specifically:

[0155] The first signal threshold determination module 101 is used to determine the signal quality threshold for inter-frequency measurement or inter-frequency handover based on the user throughput acquisition terminal if the load of the inter-frequency cell does not meet the first preset condition.

[0156] The inter-frequency measurement activation module 102 is used to instruct the terminal to activate and perform inter-frequency measurement if the source cell of the terminal is a higher frequency cell, based on the fact that the signal quality of the terminal in the source cell is lower than the signal quality threshold.

[0157] The first handover module 103 is used to switch the terminal to a lower frequency cell if it is determined that the inter-frequency handover measurement report reported by the terminal after performing inter-frequency measurement meets the preset handover conditions.

[0158] The cell handover device for a multi-layer network provided in this application specifically executes the process described in the above-described method embodiment. For details, please refer to the content of the above-described cell handover method embodiment for a multi-layer network, which will not be repeated here. The cell handover device for a multi-layer network provided in this application determines that the load of the inter-frequency cell does not meet a first preset condition. Based on user throughput, it obtains the signal quality threshold for the terminal to perform inter-frequency measurement or inter-frequency handover. When the terminal's source cell is a higher-frequency cell, the signal quality of the terminal's source cell is lower than the signal quality threshold, instructing the terminal to start inter-frequency measurement. If it is determined that the inter-frequency handover measurement report reported by the terminal after starting inter-frequency measurement meets the preset handover conditions, the terminal is switched to a lower-frequency cell. This allows users to obtain the same user throughput after inter-frequency handover, leveraging both the high-capacity advantage of high-frequency cells and the coverage-preserving advantage of low-frequency cells. Without affecting coverage, it ensures stable user throughput, thereby improving system capacity.

[0159] In one possible implementation, the cell handover device also includes:

[0160] The second handover module is used to hand over the terminal to a higher-frequency cell if the terminal's source cell is a lower-frequency cell, based on the signal quality of the higher-frequency cell being higher than a signal quality threshold.

[0161] In one possible implementation, the cell handover device also includes:

[0162] The third handover module is used to instruct the terminal to perform inter-frequency measurement if the source cell of the terminal is a lower frequency cell. If the inter-frequency handover measurement report reported by the terminal after performing the inter-frequency measurement meets the preset handover conditions, the terminal is then switched to the lower frequency cell.

[0163] In one possible implementation, the cell handover device also includes:

[0164] The fourth handover module is used to switch the terminal to the same frequency cell if it receives a same-frequency handover measurement report from the terminal and the load of the different-frequency cell meets the second preset condition.

[0165] In one possible implementation, the cell handover device also includes:

[0166] The fifth switching module is used to determine whether the terminal has enabled inter-frequency measurement if the load of the inter-frequency cell does not meet the second preset condition; if it is determined that the terminal has enabled inter-frequency measurement, the terminal is switched to the same-frequency cell.

[0167] In one possible implementation, the cell handover device also includes:

[0168] The inter-frequency measurement indication module is used to instruct the terminal to enable inter-frequency measurement if it is determined that the terminal has not enabled inter-frequency measurement.

[0169] The sixth handover module is used to switch the terminal to an inter-frequency cell if an inter-frequency handover measurement report is received from the terminal within a preset time; and to switch the terminal to a cell with the same frequency if no inter-frequency handover measurement report is received from the terminal within a preset time.

[0170] In one possible implementation, the first signal threshold determination module is specifically used for:

[0171] Based on the principle that the user throughput remains unchanged before and after the handover, the signal quality threshold for the terminal to perform inter-frequency handover is determined by combining the bandwidth and stream count of the terminal in the higher frequency cell and the lower frequency cell respectively.

[0172] In one possible implementation, the cell handover device also includes:

[0173] The second signal threshold determination module is used to determine the signal quality threshold for inter-frequency measurement or inter-frequency handover based on the coverage acquisition terminal if the load of the inter-frequency cell is determined to meet the first preset condition.

[0174] This application provides an electronic device comprising: a memory and a processor; at least one program stored in the memory, which, when executed by the processor, can achieve the following compared to the prior art: by determining that the load of the inter-frequency cell does not meet a first preset condition, obtaining a signal quality threshold for the terminal to perform inter-frequency measurement or inter-frequency handover based on user throughput; when the source cell of the terminal is a higher frequency cell, the signal quality of the terminal's source cell is lower than the signal quality threshold, instructing the terminal to start inter-frequency measurement; if it is determined that the inter-frequency handover measurement report reported by the terminal after starting inter-frequency measurement meets the preset handover condition, then the terminal is switched to a lower frequency cell, so that the user can obtain the same user throughput after inter-frequency handover, which can give full play to the high capacity advantage of high frequency cells and the coverage advantage of low frequency cells, ensuring the stability of user throughput without affecting coverage, thereby improving system capacity.

[0175] like Figure 6 As shown, embodiments of this application also provide an access network device, including a memory 120, a transceiver 140, and a processor 110;

[0176] Memory 120 is used to store computer programs;

[0177] Transceiver 140 is used to receive and send data under the control of processor 110;

[0178] Processor 110 is configured to read computer programs from memory 120 and perform the following operations:

[0179] If it is determined that the load of the inter-frequency cell does not meet the first preset condition, then the signal quality threshold for inter-frequency measurement or inter-frequency handover is obtained based on the user throughput acquisition terminal.

[0180] If the source cell of the terminal is a higher frequency cell, the terminal is instructed to start and perform inter-frequency measurement based on the fact that the signal quality of the terminal in the source cell is lower than the signal quality threshold.

[0181] If the inter-frequency handover measurement report reported by the terminal after performing inter-frequency measurement meets the preset handover conditions, the terminal will be switched to a lower frequency cell.

[0182] In one possible implementation, the signal quality threshold for inter-frequency handover by the terminal is obtained, followed by:

[0183] If the terminal's source cell is a lower-frequency cell, then the terminal will be switched to the higher-frequency cell if the signal quality of the higher-frequency cell is higher than a signal quality threshold.

[0184] In one possible implementation, if the source cell of the terminal is a lower frequency cell, the method further includes:

[0185] The terminal is instructed to perform inter-frequency measurement. If the inter-frequency handover measurement report reported by the terminal after performing the inter-frequency measurement meets the preset handover conditions, the terminal is then switched to a lower frequency cell.

[0186] In one possible implementation, the terminal is instructed to perform inter-frequency measurements, followed by:

[0187] If a same-frequency handover measurement report is received from the terminal, and the load of the different-frequency cell meets the second preset condition, then the terminal will be switched to the same-frequency cell.

[0188] In one possible implementation, if a same-frequency handover measurement report is received from the terminal, the following steps are also included:

[0189] If the load of the inter-frequency cell does not meet the second preset condition, then determine whether the terminal should enable inter-frequency measurement.

[0190] If it is determined that the terminal has enabled inter-frequency measurement, then switch the terminal to the same-frequency cell.

[0191] In one possible implementation, the process includes determining whether the terminal has enabled inter-frequency measurement, followed by:

[0192] If it is determined that the terminal has not enabled inter-frequency measurement, then instruct the terminal to enable inter-frequency measurement;

[0193] If a frequency handover measurement report is received from the terminal within a preset time, the terminal will be switched to the frequency cell.

[0194] If no inter-frequency handover measurement report is received from the terminal within the preset time, the terminal will be switched to a cell with the same frequency.

[0195] In one possible implementation, the signal quality threshold for inter-frequency handover of the terminal is obtained, including:

[0196] Based on the principle that the user throughput remains unchanged before and after the handover, the signal quality threshold for the terminal to perform inter-frequency handover is determined by combining the bandwidth and stream count of the terminal in the higher frequency cell and the lower frequency cell respectively.

[0197] In one possible implementation, the method also includes:

[0198] If it is determined that the load of the inter-frequency cell meets the first preset condition, then the signal quality threshold for inter-frequency measurement or inter-frequency handover is based on the coverage acquisition terminal.

[0199] In one possible implementation, the first preset condition is that the load of the inter-frequency cell is greater than the load of the source cell and the load difference between the inter-frequency cell and the source cell exceeds the first preset load threshold.

[0200] In one possible implementation, the second preset condition is that the load of the inter-frequency cell is greater than the load of the same-frequency cell, and the load difference between the same-frequency cell and the inter-frequency cell exceeds the second preset load threshold.

[0201] Among them, Figure 6 In this context, the bus architecture can include any number of interconnected buses and bridges, specifically linking various circuits of one or more processors 110 (represented by processor 110) and memory 120 (represented by memory 120). The bus architecture can also link various other circuits, such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. Bus interface 130 provides an interface. Transceiver 140 can be multiple elements, including transmitters and receivers, providing a unit for communicating with various other devices over transmission media, including wireless channels, wired channels, optical fibers, etc. Processor 110 is responsible for managing the bus architecture and general processing, and memory 120 can store data used by processor 110 during operation. For different user devices, user interface 150 can also be an interface capable of connecting external or internal devices, including but not limited to keypads, displays, speakers, microphones, joysticks, etc.

[0202] The processor 110 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable logic device (CPLD). The processor 110 may also adopt a multi-core architecture.

[0203] The processor 110 executes any of the methods provided in the embodiments of this application according to the obtained executable instructions by calling a computer program stored in the memory 120. The processor 110 and the memory 120 may also be physically separated.

[0204] Please see Figure 7 The figure illustrates an exemplary schematic diagram of the user distribution in a multi-layer network according to an embodiment of this application. As shown, the ratio of 2.6GHz cells to 700MHz cells in this multi-layer network is 3:1. Initially, all users preferentially access the 2.6GHz cell. Users within the 2.6GHz cell are distinguished by their shapes: pentagrams represent users with excellent signal quality, circles represent users with good signal quality, and triangles and squares represent users with poor signal quality. By applying the method of this embodiment, squares represent users who have not sent intra-frequency handover measurement reports but have enabled inter-frequency measurements. These users remain in the 2.6GHz cell when the 700MHz cell is heavily loaded; otherwise, they switch to the 700MHz cell.

[0205] The triangle represents users who sent the same frequency handover measurement report. These users will prioritize handover to the same frequency 2.6GHz cell when the 700MHz cell is heavily loaded, otherwise they will prioritize handover to the 700MHz cell. After a period of time, the users in the dashed area will be distributed in the 700MHz cell, and the remaining users will be distributed in the three 2.6GHz cells.

[0206] The cell handover method in this application embodiment ensures that maximum user throughput is achieved without affecting coverage, thereby improving system throughput. Simultaneously, it guarantees load balancing among cells in a multi-layered network, thus avoiding handover triggered by load imbalance in the multi-layered network. Compared to simple coverage-based reselection and handover, this invention fully utilizes the characteristics of a multi-layered network, leveraging both the high-capacity advantage of high-frequency cells and the coverage-preserving advantage of low-frequency cells. This improves UE throughput and, consequently, system capacity without affecting coverage.

[0207] Compared to cell reselection and handover based solely on load, this invention utilizes the characteristic of co-frequency and inter-frequency neighboring cells existing simultaneously in a multi-layer network to adjust cell reselection and handover strategies based on load conditions, thereby suppressing the load imbalance problem between multi-layer networks and avoiding cell reselection and handover triggered by load.

[0208] In one alternative embodiment, an electronic device is provided, such as Figure 8 As shown, Figure 8 The illustrated electronic device 4000 includes a processor 4001 and a memory 4003. The processor 4001 and the memory 4003 are connected, for example, via a bus 4002. Optionally, the electronic device 4000 may also include a transceiver 4004. It should be noted that in practical applications, the transceiver 4004 is not limited to one type, and the structure of this electronic device 4000 does not constitute a limitation on the embodiments of this application.

[0209] Processor 4001 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. Processor 4001 may also be a combination that implements computational functions, such as including one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc.

[0210] Bus 4002 may include a pathway for transmitting information between the aforementioned components. Bus 4002 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. Bus 4002 can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 8 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0211] The memory 4003 may be ROM (Read Only Memory) or other types of static storage devices capable of storing static information and instructions, RAM (Random Access Memory) or other types of dynamic storage devices capable of storing information and instructions, or EEPROM (Electrically Erasable Programmable Read Only Memory), CD-ROM (Compact Disc Read Only Memory) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but not limited thereto.

[0212] The memory 4003 stores application code that executes the scheme of this application, and its execution is controlled by the processor 4001. The processor 4001 executes the application code stored in the memory 4003 to implement the content shown in the foregoing method embodiments.

[0213] This application provides a computer-readable storage medium storing a computer program. When the program is run on a computer, it enables the computer to execute the corresponding content in the aforementioned method embodiments. Compared with the prior art, by determining that the load of the inter-frequency cell does not meet a first preset condition, the signal quality threshold for the terminal to perform inter-frequency measurement or inter-frequency handover is obtained based on the user throughput. When the source cell of the terminal is a higher frequency cell, the signal quality of the terminal's source cell is lower than the signal quality threshold, instructing the terminal to start inter-frequency measurement. If it is determined that the inter-frequency handover measurement report reported by the terminal after starting inter-frequency measurement meets the preset handover conditions, the terminal is switched to a lower frequency cell, so that the user can obtain the same user throughput after inter-frequency handover. This leverages both the high capacity advantage of high-frequency cells and the coverage advantage of low-frequency cells, ensuring stable user throughput without affecting coverage, thereby improving system capacity.

[0214] This application provides a computer program including computer instructions stored in a computer-readable storage medium. When a processor of a computer device reads the computer instructions from the computer-readable storage medium, the processor executes the computer instructions, causing the computer device to perform the content shown in the foregoing method embodiments. Compared with the prior art, by determining that the load of the inter-frequency cell does not meet a first preset condition, a signal quality threshold for inter-frequency measurement or inter-frequency handover is obtained based on user throughput. When the source cell of the terminal is a higher frequency cell, the signal quality of the terminal's source cell is lower than the signal quality threshold, instructing the terminal to start inter-frequency measurement. If it is determined that the inter-frequency handover measurement report reported by the terminal after starting inter-frequency measurement meets the preset handover conditions, the terminal is switched to a lower frequency cell, so that the user can obtain the same user throughput after inter-frequency handover. This leverages both the high capacity advantage of high-frequency cells and the coverage advantage of low-frequency cells, ensuring stable user throughput without affecting coverage, thereby improving system capacity.

[0215] It should be understood that although the steps in the flowcharts of the accompanying figures are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the accompanying figures may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0216] The above are only some embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A cell handover method for a multi-layer network, characterized in that, The multi-layer network includes at least one higher-frequency cell and at least one lower-frequency cell, and the method includes: If it is determined that the load of the inter-frequency cell does not meet the first preset condition, then while keeping the user throughput before and after the handover unchanged, the signal quality threshold for the terminal to perform inter-frequency measurement or inter-frequency handover is obtained; wherein, when the source cell of the terminal is the higher frequency cell, the signal quality threshold is used to determine whether the terminal performs inter-frequency measurement, and when the source cell of the terminal is the lower frequency cell, the signal quality threshold is used to determine whether the terminal performs inter-frequency handover. If the source cell of the terminal is the higher frequency cell, then based on the fact that the signal quality of the terminal in the source cell is lower than the signal quality threshold, the terminal is instructed to start and perform inter-frequency measurement; If it is determined that the inter-frequency handover measurement report reported by the terminal after performing inter-frequency measurement meets the preset handover conditions, then the terminal is switched to the lower frequency cell; If the source cell of the terminal is the lower frequency cell, then the terminal is switched to the higher frequency cell if the signal quality of the higher frequency cell is higher than the signal quality threshold.

2. The cell handover method as described in claim 1, characterized in that, If the source cell of the terminal is the lower frequency cell, the method further includes: The terminal is instructed to perform inter-frequency measurement. If the inter-frequency handover measurement report reported by the terminal after performing the inter-frequency measurement meets the preset handover conditions, the terminal is then switched to the lower frequency cell.

3. The cell handover method according to claim 1 or 2, characterized in that, The method further includes instructing the terminal to perform inter-frequency measurements, and then including: If a same-frequency handover measurement report is received from the terminal, and the load of the different-frequency cell meets the second preset condition, then the terminal is switched to the same-frequency cell.

4. The cell handover method according to claim 3, characterized in that, If the same-frequency handover measurement report is received from the terminal, the process further includes: If the load of the inter-frequency cell does not meet the second preset condition, then determine whether the terminal enables inter-frequency measurement; If it is determined that the terminal has enabled inter-frequency measurement, then the terminal is switched to the same-frequency cell.

5. The cell handover method according to claim 4, characterized in that, The step of determining whether the terminal has enabled inter-frequency measurement further includes: If it is determined that the terminal has not enabled inter-frequency measurement, then instruct the terminal to enable inter-frequency measurement; If a frequency handover measurement report is received from the terminal within a preset time, the terminal is switched to the frequency cell. If no inter-frequency handover measurement report is received from the terminal within a preset time, the terminal is switched to the same-frequency cell.

6. The cell handover method according to claim 1, characterized in that, The signal quality threshold for the acquisition terminal to perform inter-frequency switching includes: Based on the principle that the user throughput remains unchanged before and after the handover, and combined with the bandwidth and stream count of the terminal in the higher frequency cell and the lower frequency cell respectively, the signal quality threshold for the terminal to perform inter-frequency measurement or inter-frequency handover is determined.

7. The cell handover method according to claim 1, characterized in that, Also includes: If it is determined that the load of the inter-frequency cell meets the first preset condition, then the signal quality threshold for inter-frequency measurement or inter-frequency handover is based on the coverage acquisition terminal.

8. The cell handover method according to claim 1 or 7, characterized in that, The first preset condition is that the load of the inter-frequency cell is greater than the load of the source cell and the load difference between the inter-frequency cell and the source cell exceeds a first preset load threshold.

9. The cell handover method according to claim 3, characterized in that, The second preset condition is that the load of the inter-frequency cell is greater than the load of the same-frequency cell, and the load difference between the same-frequency cell and the inter-frequency cell exceeds the second preset load threshold.

10. A cell handover device for a multi-layer network, characterized in that, The multi-layer network includes at least one higher-frequency cell and at least one lower-frequency cell, and the device includes: The first signal threshold determination module is used to obtain a signal quality threshold for the terminal to perform inter-frequency measurement or inter-frequency handover if it is determined that the load of the inter-frequency cell does not meet the first preset condition, while keeping the user throughput before and after the handover unchanged; wherein, when the source cell of the terminal is the higher frequency cell, the signal quality threshold is used to determine whether the terminal performs inter-frequency measurement, and when the source cell of the terminal is the lower frequency cell, the signal quality threshold is used to determine whether the terminal performs inter-frequency handover. The inter-frequency measurement activation module is used to instruct the terminal to activate and perform inter-frequency measurement if the source cell of the terminal is the higher frequency cell, based on the fact that the signal quality of the terminal in the source cell is lower than the signal quality threshold. The first handover module is used to switch the terminal to the lower frequency cell if it is determined that the inter-frequency handover measurement report reported by the terminal after performing inter-frequency measurement meets the preset handover conditions. If the source cell of the terminal is the lower frequency cell, then the terminal is switched to the higher frequency cell if the signal quality of the higher frequency cell is higher than the signal quality threshold.

11. An access network device, characterized in that, Includes memory, transceiver, and processor: A memory for storing computer programs; a transceiver for sending and receiving data under the control of the processor; and a processor for reading the computer programs from the memory and performing the following operations: If it is determined that the load of the inter-frequency cell does not meet the first preset condition, the signal quality threshold for the terminal to perform inter-frequency measurement or inter-frequency handover is obtained based on the user throughput; wherein, when the source cell of the terminal is a higher frequency cell, the signal quality threshold is used to determine whether the terminal performs inter-frequency measurement, and when the source cell of the terminal is a lower frequency cell, the signal quality threshold is used to determine whether the terminal performs inter-frequency handover. If the source cell of the terminal is a higher frequency cell, then if the signal quality of the terminal in the source cell is lower than the signal quality threshold, the terminal is instructed to start and perform inter-frequency measurement. If it is determined that the inter-frequency handover measurement report reported by the terminal after performing inter-frequency measurement meets the preset handover conditions, then the terminal is switched to a lower frequency cell. If the source cell of the terminal is the lower frequency cell, then the terminal is switched to the higher frequency cell if the signal quality of the higher frequency cell is higher than the signal quality threshold.

12. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the cell handover method for a multi-layer network as described in any one of claims 1 to 9.

13. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that cause the computer to perform the steps of the cell handover method for a multi-layer network as described in any one of claims 1 to 9.

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