Communication methods and communication equipment

Abstract

A communication method and communication device applicable to the field of wireless communication are provided. In this method, two frequencies are deployed in a first cell and a third frequency is deployed in a second cell, and a first terminal preferentially selects to access the first cell using the first frequency, and a second terminal preferentially selects to access the second cell using the third frequency. A first mapping relationship is not established in the network device, so that the first terminal is not handed over to the second cell after accessing the first cell using the first frequency, and the second terminal is not handed over to the first frequency of the first cell after accessing the second cell using the third frequency, thereby ensuring a good communication experience for high-speed rail passengers after accessing the first cell using the first frequency. A second mapping relationship is established in the network device, so that if the second terminal is at risk of call dropping when moving through an overlapping area between the first and second cells, the second terminal is allowed to hand over from the second cell to the second frequency of the first cell, thereby reducing the risk of call dropping for the second terminal.

Description

Technical Field

[0001] [Related Application] This application claims priority to Chinese Patent Application No. 202211452985.2, filed with the China National Intellectual Property Administration on November 21, 2022, with the title "COMMUNICATION METHOD AND COMMUNICATION APPARATUS", which is hereby incorporated by reference in its entirety.

[0002] [Technical Field] Embodiments of this application relate to the field of wireless communication, and more specifically, to communication methods and communication devices.

Background Art

[0003] Currently, in order to improve the communication experience of users, different networks can be deployed for different scenarios. For example, a dedicated high-speed rail network specialized in providing services for high-speed rail users can be deployed along the high-speed rail line, and a high-speed rail public network specialized in providing services for non-high-speed rail users can be deployed around the dedicated high-speed rail network.

Summary of the Invention

[0004] This application provides a communication method and a communication device, where a first terminal can be accommodated in a first cell that provides services to the first terminal, and when the communication quality of a second terminal is poor, the second terminal can be handed over from a second cell to the first cell.

[0005] According to the first embodiment, a communication method is provided. The method includes the following: A network device transmits a first synchronization signal block (SSB) at a first frequency and a second SSB at a second frequency. The first and second frequencies correspond to a first cell, the first cell being a cell that provides services to a first terminal. Next, the network device transmits a third SSB at a third frequency. The third frequency corresponds to a second cell, the second cell being a cell that provides services to a second terminal, the second terminal's speed of movement being less than the first terminal's speed of movement. A first mapping relationship is not configured for the network device and includes a correspondence between the first cell, the first frequency, the second cell, and the third frequency. A second mapping relationship is configured for the network device and includes a correspondence between the first cell, the second frequency, the second cell, and the third frequency. The network device then receives a first request from the first terminal. The first request requests access to the first cell at the first frequency. Furthermore, the network device receives a second request from the second terminal. The second request requests access to the second cell on the third frequency.

[0006] Based on the aforementioned technical solution, two frequencies, a first frequency and a second frequency, are deployed in the first cell, and a third frequency is deployed in the second cell. The first terminal preferentially chooses to access the first cell using the first frequency, and the second terminal preferentially chooses to access the second cell using the third frequency. By not establishing a first mapping relationship in the network equipment, the first terminal is not handed over from the first cell to the second cell after accessing the first cell using the first frequency, and the second terminal is not handed over from the second cell to the first frequency of the first cell after accessing the second cell using the third frequency, thereby ensuring a smooth communication experience for high-speed rail users after accessing the first cell using the first frequency. By configuring a second mapping relationship in the network equipment, if the second terminal experiences a call drop risk when moving through the overlapping area between the first and second cells, the second terminal can be handed over from the second cell to the second frequency of the first cell, thereby reducing the call drop risk when the second terminal moves within the overlapping area between the first and second cells.

[0007] Furthermore, since the first terminal preferentially chooses to access the first cell on the first frequency, if the second terminal is handed over from the second cell to the first cell on the first frequency, it will affect the communication experience of high-speed rail users.

[0008] In one implementation, the first transmit power is greater than the second transmit power, the first transmit power is the transmit power used when the network device transmits the first SSB at the first frequency, and the second transmit power is the transmit power used when the network device transmits the second SSB at the second frequency.

[0009] Based on the technical solution described above, when transmitting the first SSB and the second SSB, the network device can use high transmit power for the first SSB transmitted at the first frequency and low transmit power for the second SSB transmitted at the second frequency, in order to allow the first terminal to preferentially access the first cell at the first frequency. In this case, the signal energy of the first SSB detected by the first terminal at the first frequency is high, and therefore the first terminal can choose to access the first cell at the first frequency. Thus, the accuracy of the first terminal's access to the first cell at the first frequency is improved.

[0010] In one implementation, the method further includes transmitting a first identifier at a first frequency. The first identifier indicates that the first cell is a cell that provides services to a first terminal.

[0011] Based on the aforementioned technical solution, in order to enable a first terminal to preferentially access a first cell at a first frequency, the network device can transmit a first identifier at a first frequency, and the first terminal can determine, based on the first identifier received at the first frequency, that the first cell is a cell that provides services to the first terminal. In this case, the first terminal can access the first cell at a first frequency, and the accuracy of the first terminal's access to the first cell at a first frequency can be improved.

[0012] In one implementation, the second and third frequencies are the same.

[0013] According to the above technical solution, if the second and third frequencies can be the same, terminals can perform cell handovers more efficiently on the same frequency. Therefore, when it is necessary to hand over a second terminal from the second cell to the second frequency of the first cell, the handover procedure between the network device and the second terminal can be performed more efficiently.

[0014] In one implementation, the method further includes handing over the first terminal from the second cell to the first frequency of the first cell when the first terminal is housed in the second cell.

[0015] Based on the above technical solutions, by handing over the first terminal housed in the second cell to the first frequency of the first cell, the first terminal is housed on the first frequency of the first cell, improving the communication quality of the first terminal housed in the first cell and enhancing the communication experience for high-speed rail users.

[0016] In one implementation, the method further includes handing over the second terminal from the first cell to the second cell when the second terminal is housed in the first cell at the first frequency.

[0017] Based on the above technical solutions, by handing over the second terminal, which is housed in the first cell on the first frequency, to the second cell, the number of second terminals housed on the first frequency of the first cell is reduced, improving the communication quality of the first terminal housed in the first cell and enhancing the communication experience for high-speed rail users.

[0018] According to a second aspect, a communication method is provided. The method includes the following: A first terminal receives a first SSB from a network device on a first frequency and a second SSB from a network device on a second frequency. The first and second frequencies correspond to a first cell, the first cell being a cell that provides services to the first terminal. A first mapping relationship is not configured with respect to the network device and includes a correspondence between the first cell, the first frequency, the second cell, and the third frequency. A second mapping relationship is configured with respect to the network device and includes a correspondence between the first cell, the second frequency, the second cell, and the third frequency. The third frequency corresponds to a second cell, the second cell being a cell that provides services to the second terminal. The travel speed of the second terminal is less than the travel speed of the first terminal. Next, the first terminal sends a first request to the network device. The first request requests access to the first cell on the first frequency.

[0019] Based on the aforementioned technical solution, two frequencies, a first frequency and a second frequency, are deployed in the first cell, and a third frequency is deployed in the second cell. The first terminal preferentially chooses to access the first cell using the first frequency, and the second terminal preferentially chooses to access the second cell using the third frequency. By not establishing a first mapping relationship in the network equipment, the first terminal is not handed over from the first cell to the second cell after accessing the first cell using the first frequency, and the second terminal is not handed over from the second cell to the first frequency of the first cell after accessing the second cell using the third frequency, thereby ensuring a smooth communication experience for high-speed rail users after accessing the first cell using the first frequency. By configuring a second mapping relationship in the network equipment, if the second terminal experiences a call drop risk when moving through the overlapping area between the first and second cells, the second terminal can be handed over from the second cell to the second frequency of the first cell, thereby reducing the call drop risk when the second terminal moves within the overlapping area between the first and second cells.

[0020] In one implementation, the first transmit power is greater than the second transmit power, the first transmit power is the transmit power used when the first SSB is transmitted at the first frequency, and the second transmit power is the transmit power used when the second SSB is transmitted at the second frequency.

[0021] Based on the technical solution described above, when transmitting the first SSB and the second SSB, the network device can use high transmit power for the first SSB transmitted at the first frequency and low transmit power for the second SSB transmitted at the second frequency, in order to allow the first terminal to preferentially access the first cell at the first frequency. In this case, the signal energy of the first SSB detected by the first terminal at the first frequency is high, and therefore the first terminal can choose to access the first cell at the first frequency. Thus, the accuracy of the first terminal's access to the first cell at the first frequency is improved.

[0022] In one implementation, the method further includes receiving a first identifier transmitted by a network device at a first frequency. The first identifier indicates that a first cell is a cell that provides services to a first terminal. Sending a first request to the network device includes sending a first request to the network device based on the first identifier.

[0023] Based on the aforementioned technical solution, in order to enable a first terminal to preferentially access a first cell at a first frequency, the network device can transmit a first identifier at a first frequency, and the first terminal can determine, based on the first identifier received at the first frequency, that the first cell is a cell that provides services to the first terminal. In this case, the first terminal can access the first cell at a first frequency, and the accuracy of the first terminal's access to the first cell at a first frequency can be improved.

[0024] In one implementation, the second and third frequencies are the same.

[0025] According to the above technical solution, if the second and third frequencies can be the same, terminals can perform cell handovers more efficiently on the same frequency. Therefore, when it is necessary to hand over a second terminal from the second cell to the second frequency of the first cell, the handover procedure between the network device and the second terminal can be performed more efficiently.

[0026] According to the third aspect, a communication method is provided. The method includes the following. The second terminal receives a third SSB from a network device at a third frequency. The third frequency corresponds to a second cell, and the second cell is a cell that provides services to the second terminal. A first mapping relationship is not configured for the network device, and the first mapping relationship includes the correspondence among a first cell, a first frequency, a second cell, and a third frequency. A second mapping relationship is configured for the network device, and the second mapping relationship includes the correspondence among a first cell, a second frequency, a second cell, and a third frequency. The first cell and the second frequency correspond to the first cell, and the first cell is a cell that provides services to the first terminal. The moving speed of the second terminal is smaller than that of the first terminal. Next, the second terminal sends a second request to the network device. The second request requests to access the second cell at the third frequency.

[0027] Based on the foregoing technical solution, two frequencies, i.e., a first frequency and a second frequency, are deployed in the first cell, and a third frequency is deployed in the second cell. The first terminal preferentially selects to access the first cell at the first frequency, and the second terminal preferentially selects to access the second cell at the third frequency. No first mapping relationship is provided for the network device, so that after accessing the first cell at the first frequency, the first terminal is not handed over from the first cell to the second cell, and after accessing the second cell at the third frequency, the second terminal is not handed over from the second cell to the first frequency of the first cell, thereby ensuring the communication experience of high-speed railway users after accessing the first cell at the first frequency. A second mapping relationship is configured for the network device. When the second terminal is at risk of call drop when moving in the overlapping area between the first cell and the second cell, the second terminal is allowed to be handed over from the second cell to the second frequency of the first cell, thereby reducing the call drop risk when the second terminal moves within the overlapping area between the first cell and the second cell.

[0028] In one implementation, the first transmission power is greater than the second transmission power. The first transmission power is the transmission power used when the network device transmits the first SSB at the first frequency, and the second transmission power is the transmission power used when the network device transmits the second SSB at the second frequency.

[0029] Based on the above technical solution, in order to enable the first terminal to be able to preferentially access the first cell at the first frequency, when transmitting the first SSB and the second SSB, the network device can use a high transmission power for the first SSB transmitted at the first frequency and a low transmission power for the second SSB transmitted at the second frequency. In this case, the signal energy of the first SSB detected by the first terminal at the first frequency is high. Therefore, the first terminal can choose to access the first cell at the first frequency. Therefore, the accuracy of the first terminal accessing the first cell at the first frequency is improved.

[0030] In one implementation, the method further includes receiving a first identifier transmitted by the network device at the first frequency. The first identifier indicates that the first cell is a cell that provides services to the first terminal. Transmitting a second request to the network device includes transmitting a second request to the network device based on the first identifier.

[0031] Based on the above technical solution, in order to enable the second terminal to be able to preferentially access the first cell at the second frequency, the network device can transmit the first identifier at the first frequency, and the second terminal can determine that the first cell is a cell that provides services to the first terminal based on the first identifier received at the first frequency. In this case, the second terminal accesses the first cell at the second frequency, and the accuracy of the second terminal accessing the first cell at the second frequency can be improved.

[0032] In one implementation, the second frequency and the third frequency are the same frequency.

[0033] According to the above technical solution, if the second and third frequencies can be the same, terminals can perform cell handovers more efficiently on the same frequency. Therefore, when it is necessary to hand over a second terminal from the second cell to the second frequency of the first cell, the handover procedure between the network device and the second terminal can be performed more efficiently.

[0034] According to a fourth aspect, a communication device is provided. The communication device may be a network device or terminal device in the manner described above, or a module used within a network device or terminal device. The communication device includes a processor, which may be coupled to memory and configured to execute instructions in memory to perform the manner performed by the network device or terminal device in any one of the manner described above and in any possible implementation of any one of the manner described above. Optionally, the communication device further includes memory. Optionally, the communication device further includes a communication interface, and the processor is coupled to the communication interface.

[0035] If the communication device is a network device or a terminal device, the communication interface may be a transceiver or an input / output interface.

[0036] Optionally, a transceiver may be a transceiver circuit. Optionally, an input / output interface may be an input / output circuit.

[0037] According to the fifth aspect, a program is provided. When executed by a communication device, the program is used to perform any one of the preceding aspects and any method in any possible implementation of any one of the preceding aspects.

[0038] According to the sixth aspect, a program product is provided. The program product includes program code. When the program code is executed by a communication device, the communication device is made capable of performing any one of the preceding aspects and any method in any possible implementation of any one of the preceding aspects.

[0039] According to the seventh aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores a program. When the program is executed, the communication device is made capable of performing any one of the preceding aspects and the methods in any one of the preceding aspects in a possible implementation.

[0040] According to the eighth aspect, a communication system is provided. The communication system includes the aforementioned network device, a first terminal, and a second terminal. [Brief explanation of the drawing]

[0041] [Figure 1] This is a diagram showing the architecture of a communication system to which one embodiment of the present invention is applied.

[0042] [Figure 2] This is a diagram of a network system according to one embodiment of the present invention.

[0043] [Figure 3] This is a schematic flowchart of a communication method according to one embodiment of the present invention.

[0044] [Figure 4] This is a block diagram of a communication device according to one embodiment of the present invention.

[0045] [Figure 5] This is a block diagram of another communication device according to one embodiment of the present invention. [Modes for carrying out the invention]

[0046] The following describes the technical solutions of the embodiments in this application with reference to the attached drawings. In this description, unless otherwise specified, " / " indicates that the associated objects are in an "or" relationship. For example, A / B may represent A or B. In this application, "and / or" describes only the relationship between associated objects and indicates that three relationships may exist. For example, A and / or B may represent the following three cases: only A exists, A and both exist, and only B exists, where A and B may be singular or plural. Furthermore, in this description, unless otherwise specified, "plural" means two or more. "At least one (piece) of the following items" or similar expressions mean any combination of these items and represent a single item (piece) or any combination of multiple items (pieces). For example, at least one item (piece) among a, b, or c may represent a, b, c, a and b, a and c, b and c, or a, b, and c, where a, b, and c may be singular or plural. Furthermore, in order to clearly illustrate the technical solutions of the embodiments of the present application, terms such as "first" and "second" are used in the embodiments of the present application to distinguish between the same or similar items that provide essentially the same function or purpose. Those skilled in the art will understand that terms such as "first" and "second" do not limit the quantity or order of execution, and that terms such as "first" and "second" do not indicate a clear difference.

[0047] The technical solutions in the embodiments of this application can be applied to various communication systems, such as New Radio (NR) in 5th generation (5G) mobile communication systems, and future mobile communication systems.

[0048] Figure 1 is a diagram of the architecture of a mobile communication system applicable to one embodiment of the present application. As shown in Figure 1, the mobile communication system includes a core network device 110, a radio access network device 120, and at least one terminal device (e.g., terminal devices 130 and 140 in Figure 1). The terminal device is wirelessly connected to the radio access network device, and the radio access network device is wirelessly or wired connected to the core network device. The core network device and the radio access network device may be different, independent physical devices, or the functions of the core network device and the logical functions of the radio access network device may be integrated into one physical device, or some functions of the core network device and some functions of the radio access network device may be integrated into one physical device. The terminal device may be located in a fixed position or may be mobile. Figure 1 is merely an example. The communication system may further include other network devices, for example, a radio relay device and a radio backhaul device not shown in Figure 1. The number of core network devices, radio access network devices and terminal devices included in the mobile communication system is not limited to the embodiments of the present application.

[0049] The wireless access network device in the embodiments of this application is an access device used to wirelessly access a mobile communication system by a terminal device. The wireless access network device may be a NodeB (NodeB), an evolved NodeB (eNodeB), a transmission reception point (TRP), a next-generation NodeB (gNB) in a 5G mobile communication system, a base station in a future mobile communication system, or an access node in a Wi-Fi system, or a wireless controller in a Cloud Radio Access Network (CRAN) scenario, or a relay station, an in-vehicle device, a wearable device, or a network device in a future evolved PLMN network. The specific technologies and device types used by the wireless access network device are not limited to the embodiments of this application. In this application, the wireless access network device is abbreviated as a network device. Unless otherwise specified, all network devices in this application are wireless access network devices.

[0050] The terminal device in the embodiments of this application may also be called a terminal, user equipment (UE), mobile station (MS), mobile terminal (MT), etc. The terminal device may be a mobile phone, a pad, a computer with wireless transceiver functionality, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, etc. The specific technologies and device types used in the terminal device are not limited to the embodiments of this application.

[0051] Network devices and terminal devices may be deployed on the ground, may include indoor or outdoor devices, handheld or vehicle-mounted devices, may be deployed on water, or may be deployed on aircraft, balloons, and satellites in the air. The application scenarios for network devices and terminal devices are not limited to the embodiments of this application.

[0052] Network devices and terminal devices may communicate with each other using licensed spectrum, unlicensed spectrum, or both. Network devices and terminal devices may communicate with each other using spectrum below 6 gigahertz (GHz), spectrum above 6 GHz, or both spectrum below 6 GHz and spectrum above 6 GHz. The spectrum resources used between network devices and terminal devices are not limited to the embodiments of this application.

[0053] The following is a brief explanation of the use of nouns in this application.

[0054] High-speed rail dedicated network

[0055] A dedicated high-speed rail network consists of cells that run along high-speed rail lines and provide services to high-speed rail users. High-speed rail users include passengers on high-speed trains in operation, train crew members, and others.

[0056] High-speed rail public network

[0057] The high-speed rail public network is a network of cells that surrounds the high-speed rail dedicated network and provides services to non-high-speed rail users. Non-high-speed rail users may include users near high-speed rail lines. In this application, the first terminal corresponds to a high-speed rail user, and the second terminal corresponds to a non-high-speed rail user.

[0058] This application provides a network system for a dedicated high-speed rail network and a public high-speed rail network. Figure 2 is a diagram of the network system.

[0059] It can be seen that the cell corresponding to the high-speed rail dedicated network (corresponding to the first cell) has two frequencies deployed, indicated as the first frequency and the second frequency. The first cell provides services to the first terminal. Specifically, in the first cell, the network equipment may communicate with the terminal housed in the first cell using the first frequency and the second frequency. The cell corresponding to the high-speed rail public network (corresponding to the second cell) has one frequency deployed, indicated as the third frequency. The second cell provides services to the second terminal. Specifically, in the second cell, the network equipment may communicate with the terminal housed in the second cell using the third frequency.

[0060] In this application, a cell corresponding to a dedicated high-speed rail network may include one or more first cells. A first terminal preferentially accesses one of the first cells at a first frequency. A cell corresponding to a public high-speed rail network may include one or more second cells. A second terminal preferentially accesses one of the second cells at a third frequency. Hereinafter, this application will be described using an example in which a cell corresponding to a dedicated high-speed rail network includes multiple first cells and a cell corresponding to a public high-speed rail network includes multiple second cells.

[0061] For a terminal connected to a first cell on a first frequency, if it is necessary to hand over the terminal from the first cell to a second cell, a first mapping relationship must be configured in the network device. This first mapping relationship includes correspondences between multiple first cells, a first frequency, a third frequency, and multiple second cells. Based on the first mapping relationship, the network device can obtain measurement reports for multiple second cells corresponding to multiple first cells. After obtaining measurement reports for multiple second cells, the network device can generate a first target cell list for the terminal based on the measurement reports. The first target cell list includes second cells, third frequencies, and first cells and first frequencies corresponding to the second cell and third frequency that have good communication quality among the multiple second cells. Then, if it is necessary to hand over a terminal connected to a first cell on a first frequency to a second cell corresponding to the third frequency, the network device can determine the third frequency and second cell corresponding to the first cell and first frequency from the first target cell list and hand over the terminal from the first cell to the second cell. In this case, the terminal accesses the second cell on the third frequency.

[0062] For terminals connected to the first cell on the second frequency, if a handover from the first cell to the second cell is necessary, a second mapping relationship must be configured in the network device. This second mapping relationship includes correspondences between multiple first cells, second frequencies, third frequencies, and multiple second cells. Based on the second mapping relationship, the network device can obtain measurement reports for multiple second cells corresponding to multiple first cells. After obtaining measurement reports for multiple second cells, the network device can generate a second target cell list for the terminal based on the measurement reports. The second target cell list includes second cells, third frequencies, and first and second frequencies corresponding to the second and third cells that have good communication quality among the multiple second cells. Then, if a terminal connected to the first cell on the second frequency needs to be handover to a second cell corresponding to the third frequency, the network device can determine the third frequency and second cell corresponding to the first and second frequencies from the second target list and handover the terminal from the first cell to the second cell. In this case, the terminal accesses the second cell on the third frequency.

[0063] For a terminal connected to the second cell on the third frequency, if it is necessary to hand over the terminal from the second cell to the first frequency of the first cell, a first mapping relationship must be configured in the network device. Based on the first mapping relationship, the network device can obtain measurement reports for multiple first cells corresponding to multiple second cells. After obtaining measurement reports for multiple first cells, the network device can generate a third target cell list for the terminal based on the measurement reports. The third target cell list includes the first cell, the first frequency, and the second and third frequencies corresponding to the first cell and first frequency that have good communication quality among the multiple first cells. Then, if it is necessary to hand over a terminal connected to the second cell to the first frequency of the first cell, the network device can determine the first frequency and first cell corresponding to the second and third frequencies from the third target cell list and hand over the terminal from the second cell to the first cell. In this case, the terminal accesses the first cell on the first frequency.

[0064] For a terminal connected to the second cell on the third frequency, if it is necessary to hand over the terminal from the second cell to the second frequency of the first cell, a second mapping relationship must be configured in the network device. Based on the second mapping relationship, the network device can obtain measurement reports for multiple first cells corresponding to multiple second cells. After obtaining measurement reports for multiple first cells, the network device can generate a fourth target cell list for the terminal based on the measurement reports. The fourth target cell list includes the first cell, second frequency, and the second and third frequencies corresponding to the first and second cells and frequencies that have good communication quality among the multiple first cells. Then, if it is necessary to hand over a terminal connected to the second cell to the second frequency of the first cell, the network device can determine the second frequency and first cell corresponding to the second and third frequencies from the fourth target cell list and hand over the terminal from the second cell to the first cell. In this case, the terminal accesses the first cell on the second frequency.

[0065] In this invention, in order to prevent the first terminal from being handed over from the first cell to the second cell after it has accessed the first cell at the first frequency, and to prevent the second terminal from being handed over from the second cell to the first frequency of the first cell after it has accessed the second cell at the third frequency, the first terminal is not handed over from the first cell to the second cell after it has accessed the first frequency of the first cell, and the second terminal is not handed over to the first frequency of the second cell after it has accessed the second cell at the third frequency. Therefore, in the network scheme shown in Figure 2, the first mapping relationship is not configured for the first network device. In this case, the network device cannot hand over the first terminal, which is accessing the first cell at the first frequency, from the first cell to the second cell, and the network device cannot hand over the second terminal from the second cell to the first frequency of the first cell.

[0066] Furthermore, since the first terminal preferentially chooses to access the first cell on the first frequency, if the second terminal is handed over from the second cell to the first cell on the first frequency, it will affect the communication experience of high-speed rail users.

[0067] Furthermore, to avoid call dropouts when the second terminal moves through the overlapping area between the first and second cells, the network device allows the second terminal to be handed over from the second cell to the second frequency of the first cell if a call dropout risk occurs. Based on this, a second mapping relationship is configured in the network device. If a call dropout risk occurs for the second terminal, the network device can hand over the second terminal from the second cell to the second frequency of the first cell based on the fourth target cell list.

[0068] For example, in one implementation, the second frequency and the third frequency may be the same. In this case, the second SSB transmitted by the network device on the second frequency and the third SSB transmitted on the third frequency are the same SSB. Therefore, the second SSB received by the first terminal on the second frequency and the third SSB received on the third frequency are the same SSB.

[0069] This invention provides a communication method 300 that enables a first terminal to preferentially access a first cell at a first frequency, based on the network scheme shown in Figure 2. Figure 3 is a schematic flowchart of the communication method 300. The method will be described in detail below.

[0070] Step 301: The network device transmits the first SSB on the first frequency and the second SSB on the second frequency. The first and second frequencies correspond to the first cell, which is the cell that provides service to the first terminal.

[0071] Step 303: The network device transmits the third SSB on the third frequency. The third frequency corresponds to the second cell, which is the cell that provides service to the second terminal, and the speed of the second terminal is slower than the speed of the first terminal.

[0072] Before the first or second terminal accesses the network device, the network device may transmit a first synchronization signal block (SSB), a second SSB, and a third SSB at the first, second, and third frequencies, respectively. Step 304: The first terminal sends a first request to the network device. The first request requests the network device to access the first cell at the first frequency.

[0073] After the network device transmits SSB on the first, second, and third frequencies, the first terminal can receive the SSB and choose to access the first cell on the first frequency. In this case, the first terminal can send a first request to the network device to request access to the first cell on the first frequency.

[0074] Step 305: The second terminal sends a second request to the network device. The second request asks the network device to access the second cell on the third frequency.

[0075] After the network device transmits the first SSB, second SSB, and third SSB at the first, second, and third frequencies, the first SSB, second SSB, and third SSB can be received by a second terminal, which may choose to access the second cell at the third frequency. In this case, the second terminal may send a second request to the network device to request access to the second cell at the third frequency.

[0076] For example, in one implementation, the transmit power used when the network device transmits the first SSB at the first frequency (corresponding to the first transmit power) is greater than the transmit power used when the network device transmits the second SSB at the second frequency (corresponding to the second transmit power).

[0077] When transmitting the first SSB and the second SSB, the network device can use high transmit power for the first SSB transmitted at the first frequency and low transmit power for the second SSB transmitted at the second frequency, in order to allow the first terminal to choose to preferentially access the first cell at the first frequency. In this case, the signal energy of the first SSB detected by the first terminal at the first frequency is high, and therefore the first terminal can choose to access the first cell at the first frequency.

[0078] For example, in one implementation, method 300 may further include: step 302: network device transmits a first identifier at a first frequency, the first identifier indicating that the first cell is a cell that provides service to a first terminal.

[0079] For example, in order to allow a first terminal to choose to preferentially access a first cell at a first frequency, a network device can transmit a first identifier at the first frequency, and the first terminal can determine, based on the first identifier received at the first frequency, that the first cell is a cell that provides services to the first terminal. In this case, the first terminal can access the first cell at the first frequency, and the accuracy of the first terminal's access to the first cell at the first frequency can be improved.

[0080] For example, the first identifier can be transmitted using a system information block (SIB), and a network device may broadcast the SIB so that the first terminal can obtain the first identifier.

[0081] Thus, the method for selecting the first terminal to preferentially access the first cell at a first frequency may be used alone or in combination with other methods. This is not limited to the present invention.

[0082] Furthermore, if a second terminal receives the first identifier at a first frequency when a network device transmits the first identifier, the second terminal may determine, based on the first identifier received at the first frequency, that the first cell is a cell that provides services to the first terminal. In this case, the second terminal can access the second cell at a third frequency, improving the accuracy of the second terminal's access to the second cell at the third frequency.

[0083] For example, one implementation of method 300 may further include the following steps:

[0084] Step 306: If the first terminal is located in the second cell, the network device hands over the first terminal from the second cell to the first frequency of the first cell.

[0085] For example, after accessing the first cell at the first frequency, the first terminal is mistakenly handed over from the first cell to the second cell. In this case, after the network device identifies that the first terminal corresponds to a high-speed rail user, one implementation can hand over the first terminal from the second cell to the first frequency of the first cell based on a third target cell list.

[0086] In another embodiment, the network device may hand over a first terminal to the second frequency of the first cell based on a fourth target cell list, and then hand over the first terminal from the second frequency of the first cell to the first frequency of the first cell.

[0087] For example, one implementation of method 300 may further include the following steps:

[0088] Step 307: If the second terminal is connected to the first cell at the first frequency, the network device hands over the second terminal from the first cell to the second cell.

[0089] For example, the second terminal is currently connected to the first frequency of the first cell. For example, when the second terminal accesses the network for the first time, it accesses the first frequency of the first cell. In this case, after identifying that the second terminal corresponds to a non-high-speed rail user, the network device may hand over the second terminal from the first frequency of the first cell to the second frequency of the first cell, and then, based on the second target cell list, hand over the second terminal from the second frequency of the first cell to the second cell.

[0090] For example, the second terminal is currently connected to the second frequency of the first cell. For example, if a call drop risk occurs at the second terminal, the network device, based on the fourth target cell list, hands over the second terminal from the second cell to the second frequency of the first cell, and then hands over the second terminal from the second frequency of the first cell to the first frequency of the first cell. In this case, after the network device identifies that the second terminal corresponds to a non-high-speed rail user, one implementation may, based on the second target cell list, hand over the second terminal from the second frequency of the first cell to the second cell. Alternatively, if the communication quality of the second frequency of the first cell is worse than that of the second cell, the network device may, based on the second target cell list, hand over the second terminal from the second frequency of the first cell to the second cell.

[0091] For example, a network device may identify whether a terminal corresponds to a high-speed rail user or a non-high-speed rail user in the following way:

[0092] For example, a network device or core network device may determine whether a terminal corresponds to a high-speed rail user or a non-high-speed rail user based on the terminal's speed. For example, a network device or core network device may determine the terminal's speed based on the terminal's Doppler frequency shift.

[0093] Alternatively, the core network device may identify whether the terminal corresponds to a high-speed rail user or a non-high-speed rail user as described above, and then notify the network device of the identification result.

[0094] To implement the functions in the embodiments described above, the terminal includes corresponding hardware structures and / or software modules for performing the functions. Those skilled in the art will readily recognize that, in embodiments of the present application, the units and steps of the methods in the examples described with reference to embodiments disclosed in the present application can be implemented in hardware or in combination of hardware and computer software. Whether the functions are performed in hardware or in hardware driven by computer software depends on the specific application scenario and design constraints of the technical solution.

[0095] Figures 4 and 5 are structural diagrams of possible communication devices according to embodiments of the present invention, respectively. These communication devices can be configured to implement the functions of the network device or terminal device in the embodiments of the above method, and thus can also implement the beneficial effects of the embodiments of the above method. In embodiments of the present invention, the communication device may be the terminal device 130 or terminal device 140 shown in Figure 1, the wireless access network device 120 shown in Figure 1, or a module (e.g., a chip) used within the terminal device or network device.

[0096] As shown in Figure 4, the communication device 400 includes a transceiver unit 410 and a processing unit 420. The communication device 400 is configured to implement the functions of a network device, a first terminal, or a second terminal in the embodiment of the method shown in Figure 3.

[0097] When the communication device 400 is configured to implement the functions of the network device in the embodiment of the method shown in Figure 3, the transceiver unit 410 is configured to transmit a first SSB on a first frequency and a second SSB on a second frequency. The first and second frequencies correspond to a first cell, the first cell being a cell that provides services to a first terminal. The transceiver unit 410 is further configured to transmit an SSB on a third frequency. The third frequency corresponds to a second cell, the second cell being a cell that provides services to a second terminal, the second terminal's moving speed being less than the first terminal's moving speed. A first mapping relationship is not configured with respect to the network device and includes a correspondence between the first cell, the first frequency, the second cell, and the third frequency. A second mapping relationship is configured with respect to the network device and includes a correspondence between the first cell, the second frequency, the second cell, and the third frequency. The transceiver unit 410 is further configured to receive a first request from the first terminal. The first request requests access to the first cell at the first frequency. The transceiver unit 410 is further configured to receive a second request from the second terminal. The second request requests access to the second cell at the third frequency.

[0098] When the communication device 400 is configured to implement the functions of the first terminal in the embodiment of the method shown in Figure 3, the transceiver unit 410 is configured to receive SSB from the network device on a first frequency and a second frequency. The first and second frequencies correspond to a first cell, the first cell being the cell that provides services to the first terminal. A first mapping relationship is not configured with respect to the network device and includes a correspondence between the first cell, the first frequency, the second cell, and the third frequency. A second mapping relationship is configured with respect to the network device and includes a correspondence between the first cell, the second frequency, the second cell, and the third frequency. The third frequency corresponds to a second cell, the second cell being the cell that provides services to the second terminal. The travel speed of the second terminal is less than that of the first terminal. The transceiver unit 410 is further configured to send a first request to the network device. The first request requests access to the first cell on the first frequency.

[0099] For a more detailed description of the transceiver unit 410 and the processing unit 420, please refer directly to the relevant description in the embodiment of the method shown in Figure 3. Further details are not provided here.

[0100] As shown in Figure 5, the communication device 500 includes a processor 510 and an interface circuit 520. The processor 510 and the interface circuit 520 are coupled to each other. It can be understood that the interface circuit 520 may be a transceiver or an input / output interface. Optionally, the communication device 500 may further include a memory 530 configured to store instructions executed by the processor 510, input data necessary for the processor 510 to execute instructions, and data generated after the processor 510 has executed instructions.

[0101] If the communication device 500 is configured to implement the method shown in Figure 3, the processor 510 is configured to perform the functions of the processing unit 420, and the interface circuit 520 is configured to perform the functions of the transceiver unit 410.

[0102] If the communication device is a chip used within a network device, the chip within the network device implements the functions of the network device in the embodiment of the above method. The chip within the network device receives information from another module within the network device (e.g., a radio frequency module or an antenna), and the information is transmitted to the network device by a terminal device. Alternatively, the chip within the network device transmits information to another module within the network device (e.g., a radio frequency module or an antenna), and the information is transmitted to the terminal device by the network device.

[0103] If the communication device is a chip used within a terminal device, the chip within the terminal device implements the functions of the terminal device in the embodiment of the above method. The chip within the terminal device receives information from another module within the terminal device (e.g., a radio frequency module or an antenna), and the information is transmitted to the terminal device by the network device. Alternatively, the chip within the terminal device transmits information to another module within the terminal device (e.g., a radio frequency module or an antenna), and the information is transmitted to the network device by the terminal device.

[0104] It should be understood that the processor in the embodiments of the present application may be a Central Processing Unit (CPU), or another general-purpose processor, a Digital Signal Processor (DSP), an Application-Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or another programmable logic element, a transistor logic element, a hardware component, or any combination thereof. The general-purpose processor may be a microprocessor, any conventional processor, etc.

[0105] The steps of the method in the embodiments of this application may be implemented in hardware or by software instructions that can be executed by a processor. The software instructions may include corresponding software modules. The software modules may be stored in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable read-only memory, registers, hard disks, removable hard disks, CD-ROMs, or any other form of storage medium well known in the art. For example, the storage medium may be coupled to a processor, as a result the processor may read information from and write information to the storage medium. The storage medium may, alternatively, be a component of the processor. The processor and storage medium may be located within an ASIC. Furthermore, the ASIC may be located within a terminal. The processor and storage medium may, alternatively, exist as separate components within the terminal.

[0106] All or part of the embodiments described above may be implemented using software, hardware, firmware, or any combination thereof. When software is used to implement an embodiment, all or part of the embodiment may be implemented in the form of a computer program product. A computer program product includes one or more computer programs or instructions. When a computer program or instruction is loaded and executed on a computer, all or part of the procedures or functions in the embodiments of the present application are executed. The computer may be a general-purpose computer, a dedicated computer, a computer network, a network device, a user device, or another programmable device. The computer program or instruction may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer program or instruction may be transmitted from a website, computer, server, or data center to another website, computer, server, or data center by wired, wireless, or otherwise. The computer-readable storage medium may be any available medium accessible by a computer, or a data storage device, such as a server or data center integrating one or more available media. The usable media may be magnetic media, such as floppy disks, hard disks, or magnetic tapes; optical media, such as digital video discs; or semiconductor media, such as solid drives. The computer-readable storage medium may be volatile or non-volatile storage medium, or may include two types of storage media: volatile storage medium and non-volatile storage medium.

[0107] In each of the embodiments of the present application, unless otherwise stated or unless there is a logical inconsistency, the terminology and / or descriptions between different embodiments are consistent and can be referenced to one another, and the technical features in different embodiments can be combined based on their internal logical relationships to form new embodiments.

[0108] In the embodiments of this application, “at least one” means one or more, and “multiple” means two or more. “And / or” describes the relationship between associated objects and indicates that three relationships may exist. For example, A and / or B may indicate the following three cases: only A exists, A and both exist, and only B exists, where A and B may be singular or plural. In the descriptive text of the embodiments of this application, the letter “ / ” usually indicates that the associated objects are in an “or” relationship. In the expressions of the embodiments of this application, the letter “ / ” indicates that the associated objects are in a “division” relationship. “Containing at least one of A, B, and C” can mean: containing A; containing B; containing C; containing A and B; containing A and C; containing B and C; and containing A, B, and C.

[0109] It should be further understood that the various numbers in the embodiments of this application are distinguished simply for the sake of clarity and are not used to limit the scope of the embodiments of this application. The sequence numbers of the processes described above do not mean execution sequences, and the execution sequence of a process should be determined based on the function and internal logic of the process.

Claims

1. A communication method applicable to network devices, A step of transmitting a first SSB at a first frequency and a second SSB at a second frequency, wherein the first frequency and the second frequency correspond to a first cell, and the first cell is a cell that provides services to a first terminal. A step of transmitting a third SSB at a third frequency, wherein the third frequency corresponds to a second cell, the second cell is a cell that provides services to a second terminal, and the moving speed of the second terminal is less than the moving speed of the first terminal. The first mapping relationship is not configured with respect to the network device, and the first mapping relationship includes a correspondence between the first cell, the first frequency, the second cell, and the third frequency; the second mapping relationship is configured with respect to the network device, and the second mapping relationship includes a correspondence between the first cell, the second frequency, the second cell, and the third frequency; A step of receiving a first request from the first terminal, wherein the first request requests access to the first cell at the first frequency, A step of receiving a second request from the second terminal, wherein the second request requests access to the second cell at the third frequency, A method that includes this.

2. The method according to claim 1, wherein the first transmit power is greater than the second transmit power, the first transmit power is the transmit power used when the first SSB is transmitted at the first frequency, and the second transmit power is the transmit power used when the second SSB is transmitted at the second frequency.

3. The method according to claim 1, further comprising the step of transmitting a first identifier at a first frequency, wherein the first identifier indicates that the first cell is a cell that provides services to the first terminal.

4. The method according to claim 1, wherein the second frequency and the third frequency are the same frequency.

5. The aforementioned method, If the first terminal is housed in the second cell, the first terminal is handed over from the second cell to the first frequency of the first cell. The method according to claim 1, further comprising:

6. The aforementioned method, If the second terminal is connected to the first cell at the first frequency, the second terminal is handed over from the first cell to the second cell. The method according to claim 1, further comprising:

7. A communication method applicable to the first terminal, A step of receiving a first SSB from a network device at a first frequency and a second SSB from the network device at a second frequency, wherein the first frequency and the second frequency correspond to a first cell, and the first cell is a cell that provides services to the first terminal. The first mapping relationship is not configured with respect to the network device, and the first mapping relationship includes a correspondence between the first cell, the first frequency, the second cell, and the third frequency; the second mapping relationship is configured with respect to the network device, and the second mapping relationship includes a correspondence between the first cell, the second frequency, the second cell, and the third frequency, the third frequency corresponds to the second cell, the second cell is a cell that provides services to the second terminal, and the travel speed of the second terminal is less than the travel speed of the first terminal. A step of transmitting a first request to the network device, wherein the first request requests access to the first cell at the first frequency. A method that includes this.

8. The method according to claim 7, wherein the first transmit power is greater than the second transmit power, the first transmit power is the transmit power used when the first SSB is transmitted at the first frequency, and the second transmit power is the transmit power used when the second SSB is transmitted at the second frequency.

9. The aforementioned method, The step of receiving a first identifier transmitted by the network device at the first frequency, wherein the first identifier indicates that the first cell is a cell that provides services to the first terminal, The method according to claim 7, wherein the step of transmitting a first request to the network device includes the step of transmitting the first request to the network device based on the first identifier.

10. The method according to claim 7, wherein the second frequency and the third frequency are the same frequency.

11. A communication method applicable to a second terminal, A step of receiving a third SSB from a network device at a third frequency, wherein the third frequency corresponds to a second cell, and the second cell is a cell that provides services to the second terminal. The first mapping relationship is not configured with respect to the network device, and the first mapping relationship includes a correspondence between the first cell, the first frequency, the second cell, and the third frequency; the second mapping relationship is configured with respect to the network device, and the second mapping relationship includes a correspondence between the first cell, the second frequency, the second cell, and the third frequency, the first cell and the second frequency correspond to the first cell, the first cell is a cell that provides services to the first terminal, and the travel speed of the second terminal is less than the travel speed of the first terminal. A step of transmitting a second request to the network device, wherein the second request requests access to the second cell at the third frequency. A method that includes this.

12. The method according to claim 11, wherein the first transmission power is greater than the second transmission power, the first transmission power is the transmission power used when the first SSB is transmitted to the first terminal at the first frequency, and the second transmission power is the transmission power used when the second SSB is transmitted to the first terminal at the second frequency.

13. The aforementioned method, The step of receiving a first identifier transmitted by the network device at the first frequency, wherein the first identifier indicates that the first cell is a cell that provides services to the first terminal, The method according to claim 11, wherein the step of transmitting a second request to the network device includes the step of transmitting the second request to the network device based on the first identifier.

14. The method according to claim 11, wherein the second frequency and the third frequency are the same frequency.

15. A communication device comprising a processor and an interface circuit, wherein the interface circuit is configured to receive signals from other communication devices and transmit the signals to the processor, or transmit signals from the processor to other communication devices, and the processor is configured to carry out the method according to any one of claims 1 to 6 by using logic circuits or by executing code instructions.

16. A communication device comprising a processor and an interface circuit, wherein the interface circuit is configured to receive a signal from another communication device and transmit the signal to the processor, or transmit a signal from the processor to another communication device, and the processor is configured to carry out the method according to any one of claims 7 to 10 by using logic circuits or by executing code instructions.

17. A communication device comprising a processor and an interface circuit, wherein the interface circuit is configured to receive a signal from another communication device and transmit the signal to the processor, or transmit a signal from the processor to another communication device, and the processor is configured to carry out the method according to any one of claims 11 to 14 by using logic circuits or by executing code instructions.

18. A communication device comprising a unit configured to perform the method described in any one of claims 1 to 6.

19. A communication device comprising a unit configured to perform the method described in any one of claims 7 to 10.

20. A communication device comprising a unit configured to perform the method described in any one of claims 11 to 14.

21. A computer-readable storage medium, wherein the storage medium stores a computer program or instruction, and when the computer program or instruction is executed by a communication device, the method according to any one of claims 1 to 6 is performed.

22. A computer-readable storage medium, wherein the storage medium stores a computer program or instruction, and when the computer program or instruction is executed by a communication device, the method according to any one of claims 7 to 10 is performed.

23. A computer-readable storage medium, wherein the storage medium stores a computer program or instruction, and when the computer program or instruction is executed by a communication device, the method according to any one of claims 11 to 14 is carried out.

24. A computer program comprising a computer-readable instruction, wherein when the computer-readable instruction is executed on a computer, the method according to any one of claims 1 to 6 is executed.

25. A computer program comprising a computer-readable instruction, wherein when the computer-readable instruction is executed on a computer, the method according to any one of claims 7 to 10 is executed.

26. A computer program comprising a computer-readable instruction, wherein when the computer-readable instruction is executed on a computer, the method according to any one of claims 11 to 14 is executed.

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