Communication methods and devices

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 Applications] This application claims priority to Chinese Patent Application No. 202211452985.2, filed with the State Intellectual Property Office of China on November 21, 2022, entitled "COMMUNICATION METHOD AND COMMUNICATION APPARATUS," which is incorporated herein by reference in its entirety.

[0002] [Technical field] TECHNICAL FIELD Embodiments of the present application relate to the field of wireless communication, and more particularly to a communication method and a communication device. [Background technology]

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

[0004] The present application provides a communication method and a communication device in which a first terminal can be accommodated in a first cell that provides service to the first terminal, and in the event that the communication quality of a second terminal is poor, the second terminal can be handed over from the second cell to the first cell.

[0005] According to a first aspect, a communication method is provided. The method includes: a network device transmits a first synchronization signal block (SSB) on a first frequency and a second SSB on a second frequency. The first frequency and the second frequency correspond to a first cell, the first cell being a cell serving a first terminal. Next, the network device transmits a third SSB on a third frequency. The third frequency corresponds to a second cell, the second cell being a cell serving a second terminal, the moving speed of the second terminal being slower than the moving speed of the first terminal. A first mapping relationship is not configured for 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. A second mapping relationship is configured for 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. Then, the network device receives a first request from the first terminal. The first request requests access to the first cell on the first frequency. Additionally, the network device receives a second request from a second terminal, the second request requesting access to a second cell on a third frequency.

[0006] Based on the above technical solution, two frequencies, a first frequency and a second frequency, are deployed in a first cell, and a third frequency is deployed in a second cell. The first terminal preferentially selects to access the first cell using the first frequency, and the second terminal preferentially selects to access the second cell using the third frequency. A first mapping relationship is not established in the network equipment, so that 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 the communication experience of high-speed rail passengers after accessing the first cell using the first frequency. A second mapping relationship is established in the network equipment, so that if the second terminal is at risk of call dropping when traveling through the 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 when the second terminal is traveling through the overlapping area between the first and second cells.

[0007] Furthermore, since the first terminal preferentially selects to access the first cell at the first frequency, when the second terminal is handed over from the second cell to the first cell at 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 being the transmit power used when the network device transmits the first SSB at the first frequency, and the second transmit power being the transmit power used when the network device transmits the second SSB at the second frequency.

[0009] Based on the above technical solution, in order to allow the first terminal to preferentially select to access the first cell on 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 on the first frequency and a low transmission power for the second SSB transmitted on the second frequency. In this case, the signal energy of the first SSB detected by the first terminal on the first frequency is high, and therefore the first terminal can select to access the first cell on the first frequency. Therefore, the accuracy of the first terminal accessing the first cell on the first frequency is improved.

[0010] In one implementation, the method further includes transmitting a first identifier on the first frequency, the first identifier indicating that the first cell is a cell serving the first terminal.

[0011] Based on the above technical solution, to enable the first terminal to preferentially select to access the first cell on the first frequency, the network device can transmit a first identifier on the first frequency, and the first terminal can determine that the first cell is a cell serving the first terminal based on the first identifier received on the first frequency. In this case, the first terminal accesses the first cell on the first frequency, and the accuracy of the first terminal accessing the first cell on the first frequency can be improved.

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

[0013] According to the above technical solution, if the second frequency and the third frequency can be the same frequency, the terminal can more efficiently perform cell handover at the same frequency, so that when the second terminal needs to handover from the second cell to the second frequency of the first cell, the handover procedure can be more efficiently performed between the network device and the second terminal.

[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 if the first terminal is accommodated in the second cell.

[0015] Based on the above technical solution, the first terminal accommodated in the second cell is handed over to the first frequency of the first cell, so that the first terminal is accommodated in the first frequency of the first cell, thereby improving the communication quality of the first terminal accommodated in the first cell and improving the communication experience of 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 if the second terminal is accommodated in the first cell on the first frequency.

[0017] Based on the above technical solution, by handing over the second terminal accommodated in the first cell on the first frequency to the second cell, the number of second terminals accommodated in the first frequency of the first cell is reduced, the communication quality of the first terminal accommodated in the first cell is improved, and the communication experience of high-speed rail users is improved.

[0018] According to a second aspect, a communication method is provided. The method includes: a first terminal receives a first SSB from a network device on a first frequency and a second SSB from the network device on a second frequency; the first frequency and the second frequency correspond to a first cell, the first cell being a cell serving the first terminal; a first mapping relationship is not configured for the network device, the first mapping relationship including a correspondence between the first cell, the first frequency, the second cell, and a third frequency; a second mapping relationship is configured for the network device, the second mapping relationship including 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 serving the second terminal; a moving speed of the second terminal is lower than a moving speed of the first terminal; and the first terminal then transmits a first request to the network device. The first request requests access to the first cell on the first frequency.

[0019] Based on the above technical solution, two frequencies, a first frequency and a second frequency, are deployed in a first cell, and a third frequency is deployed in a second cell. The first terminal preferentially selects to access the first cell using the first frequency, and the second terminal preferentially selects to access the second cell using the third frequency. A first mapping relationship is not established in the network equipment, so that 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 the communication experience of high-speed rail passengers after accessing the first cell using the first frequency. A second mapping relationship is established in the network equipment, so that if the second terminal is at risk of call dropping when traveling through the 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 when the second terminal is traveling through 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 being the transmit power used when the first SSB is transmitted on the first frequency, and the second transmit power being the transmit power used when the second SSB is transmitted on the second frequency.

[0021] Based on the above technical solution, in order to allow the first terminal to preferentially select to access the first cell on 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 on the first frequency and a low transmission power for the second SSB transmitted on the second frequency. In this case, the signal energy of the first SSB detected by the first terminal on the first frequency is high, and therefore the first terminal can select to access the first cell on the first frequency. Therefore, the accuracy of the first terminal accessing the first cell on the first frequency is improved.

[0022] In one implementation, the method further includes receiving a first identifier transmitted by the network device on the first frequency, the first identifier indicating that the first cell is a cell serving the first terminal, and sending the first request to the network device includes sending the first request to the network device based on the first identifier.

[0023] Based on the above technical solution, to enable the first terminal to preferentially select to access the first cell on the first frequency, the network device can transmit a first identifier on the first frequency, and the first terminal can determine that the first cell is a cell serving the first terminal based on the first identifier received on the first frequency. In this case, the first terminal accesses the first cell on the first frequency, and the accuracy of the first terminal accessing the first cell on the first frequency can be improved.

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

[0025] According to the above technical solution, if the second frequency and the third frequency can be the same frequency, the terminal can more efficiently perform cell handover at the same frequency, so that when the second terminal needs to handover from the second cell to the second frequency of the first cell, the handover procedure can be more efficiently performed between the network device and the second terminal.

[0026] According to a third aspect, a communication method is provided. The method includes: a second terminal receives a third SSB from a network device on a third frequency; the third frequency corresponds to a second cell, the second cell being a cell serving the second terminal; a first mapping relationship is not configured for the network device, the first mapping relationship including 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, the second mapping relationship including 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 being a cell serving the first terminal; a moving speed of the second terminal is lower than a moving speed of the first terminal; and the second terminal then transmits a second request to the network device. The second request requests access to the second cell on the third frequency.

[0027] Based on the above technical solution, two frequencies, a first frequency and a second frequency, are deployed in a first cell, and a third frequency is deployed in a second cell. The first terminal preferentially selects to access the first cell using the first frequency, and the second terminal preferentially selects to access the second cell using the third frequency. A first mapping relationship is not established in the network equipment, so that 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 the communication experience of high-speed rail passengers after accessing the first cell using the first frequency. A second mapping relationship is established in the network equipment, so that if the second terminal is at risk of call dropping when traveling through the 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 when the second terminal is traveling through the overlapping area between the first and second cells.

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

[0029] Based on the above technical solution, in order to allow the first terminal to preferentially select to access the first cell on 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 on the first frequency and a low transmission power for the second SSB transmitted on the second frequency. In this case, the signal energy of the first SSB detected by the first terminal on the first frequency is high, and therefore the first terminal can select to access the first cell on the first frequency. Therefore, the accuracy of the first terminal accessing the first cell on the first frequency is improved.

[0030] In one implementation, the method further includes receiving a first identifier transmitted by the network device on the first frequency, the first identifier indicating that the first cell is a cell serving the first terminal, and sending the second request to the network device includes sending the second request to the network device based on the first identifier.

[0031] Based on the above technical solution, to enable the second terminal to preferentially select to access the first cell on the second frequency, the network device can transmit a first identifier on the first frequency, and the second terminal can determine that the first cell is a cell serving the first terminal based on the first identifier received on the first frequency. In this case, the second terminal accesses the first cell on the second frequency, thereby improving the accuracy of the second terminal's access to the first cell on the second frequency.

[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 frequency and the third frequency can be the same frequency, the terminal can more efficiently perform cell handover at the same frequency, so that when the second terminal needs to handover from the second cell to the second frequency of the first cell, the handover procedure can be more efficiently performed between the network device and the second terminal.

[0034] According to a fourth aspect, there is provided a communications device. The communications device may be a network device or a terminal device in the aforementioned methods, or may be a module used within the network device or the terminal device. The communications device may include a processor, coupled to a memory, configured to execute instructions in the memory to implement a method performed by the network device or the terminal device in any one of the aforementioned aspects and possible implementations of any one of the aforementioned aspects. Optionally, the communications device further includes the memory. Optionally, the communications device further includes a communications interface, the processor being coupled to the communications 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, the transceiver may be a transceiver circuit. Optionally, the input / output interface may be an input / output circuit.

[0037] According to a fifth aspect, there is provided a program, which when executed by a communications device is used to perform any method of any one of the preceding aspects and possible implementations of any one of the preceding aspects.

[0038] According to a sixth aspect, there is provided a program product, the program product comprising program code that, when executed by a communications device, enables the communications device to perform any method of any one of the preceding aspects and possible implementations of any one of the preceding aspects.

[0039] According to a seventh aspect, there is provided a computer-readable storage medium storing a program that, when executed, enables a communication device to perform the method of any one of the preceding aspects and possible implementations of any one of the preceding aspects.

[0040] According to an eighth aspect, there is provided a communication system, the communication system including the network device as described above, a first terminal and a second terminal. [Brief explanation of the drawings]

[0041] [Figure 1] 1 is a diagram of the architecture of a communication system to which an embodiment of the present application applies;

[0042] [Figure 2] FIG. 1 is a diagram of a network scheme according to an embodiment of the present application.

[0043] [Figure 3] 1 is a schematic interactive flowchart of a communication method according to an embodiment of the present application;

[0044] [Figure 4] FIG. 1 is a block diagram of a communication device according to an embodiment of the present application.

[0045] [Figure 5] FIG. 2 is a block diagram of another communication device according to an embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0046] The following describes the technical solutions of the embodiments of the present application with reference to the accompanying drawings. In the present description, unless otherwise specified, " / " indicates that associated objects are in an "or" relationship. For example, A / B may represent A or B. In the present application, "and / or" only describes the association 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. Furthermore, in the present description, unless otherwise specified, "multiple" means two or more than two. "At least one (piece) of the following items" or similar expressions means any combination of these items, representing a single item (piece) or any combination of multiple items (pieces). For example, at least one item (piece) of a, b, or c may refer to 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, to clearly describe the technical solutions of the embodiments of the present application, terms such as "first" and "second" are used to distinguish between identical or similar items that provide essentially the same function or purpose in the embodiments of the present application. Those skilled in the art may understand that terms such as "first" and "second" do not limit the quantity or execution order, and terms such as "first" and "second" do not indicate clear distinctions.

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

[0048] FIG. 1 is a diagram illustrating the architecture of a mobile communication system applicable to an embodiment of the present application. As shown in FIG. 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 device 130 and terminal device 140 in FIG. 1). The terminal device is wirelessly connected to the radio access network device, and the radio access network device is wirelessly or wiredly connected to the core network device. The core network device and the radio access network device may be separate, independent physical devices, or the core network device's functions and the logical functions of the radio access network device may be integrated into one physical device, or some of the core network device's functions and some of the radio access network device's functions may be integrated into one physical device. The terminal device may be located in a fixed location or may be mobile. FIG. 1 is merely an example. The communication system may further include other network devices, such as a radio relay device and a radio backhaul device, which are not shown in FIG. 1. The number of core network devices, radio access network devices, and terminal devices included in the mobile communication system is not limited in the embodiment of the present application.

[0049] The radio access network device in the embodiments of the present application is an access device used by a terminal device to wirelessly access a mobile communication system. The radio 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. It may also be a radio controller in a Cloud Radio Access Network (CRAN) scenario, a relay station, an in-vehicle device, a wearable device, a network device in a future evolved PLMN network, etc. The specific technology and specific device type used by the radio access network device are not limited to the embodiments of the present application. In the present application, the radio access network device is simply referred to as a network device. Unless otherwise specified, all network devices in the present application are radio access network devices.

[0050] A terminal device in an embodiment of the present application may also be referred to as 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 technology and the specific device type used in the terminal device are not limited to the embodiments of the present application.

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

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

[0053] The nouns used in this application will be briefly explained below.

[0054] Dedicated high-speed rail network

[0055] The high-speed rail dedicated network is a cell deployed along the high-speed rail line to provide services to high-speed rail users, including passengers and train crews of high-speed trains in motion.

[0056] High-speed rail public network

[0057] The high-speed rail public network is a cell deployed around the high-speed rail dedicated network to provide services to non-high-speed rail users. The non-high-speed rail users may include users near the high-speed rail line. In this application, the first terminal corresponds to the high-speed rail user, and the second terminal corresponds to the non-high-speed rail user.

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

[0059] It can be seen that two frequencies are deployed in a cell (corresponding to the first cell) corresponding to the high-speed rail dedicated network, denoted as the first frequency and the second frequency. The first cell serves a first terminal. Specifically, in the first cell, a network device may communicate with a terminal accommodated in the first cell at the first frequency and the second frequency. The cell (corresponding to the second cell) corresponding to the high-speed rail public network is deployed with one frequency, denoted as the third frequency. The second cell serves a second terminal. Specifically, in the second cell, a network device may communicate with a terminal accommodated in the second cell at the third frequency.

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

[0061] When a terminal accommodated in a first cell using a first frequency needs to handover from the first cell to a second cell, a first mapping relationship needs to be configured in the network device. The first mapping relationship includes correspondences between a plurality of first cells, a first frequency, a third frequency, and a plurality of second cells. The network device can acquire measurement reports for a plurality of second cells corresponding to the plurality of first cells based on the first mapping relationship. After acquiring the measurement reports for the plurality of 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 a second cell, a third frequency, and a first cell and a first frequency corresponding to the second cell and the third frequency, which have good communication quality among the plurality of second cells. When a terminal accommodated in the first cell using the first frequency needs to handover to a second cell corresponding to the third frequency, the network device can determine the third frequency and the second cell corresponding to the first cell and the first frequency from the first target cell list and handover the terminal from the first cell to the second cell. In this case, the terminal accesses the second cell using the third frequency.

[0062] When a terminal accommodated in a first cell using a second frequency needs to be handed over from the first cell to a second cell, a second mapping relationship needs to be configured in the network device. The second mapping relationship includes correspondences between a plurality of first cells, a second frequency, a third frequency, and a plurality of second cells. The network device can acquire measurement reports for a plurality of second cells corresponding to the plurality of first cells based on the second mapping relationship. After acquiring the measurement reports for the plurality of 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 a second cell, a third frequency, and a first cell and a second frequency corresponding to the second cell and the third frequency, which have good communication quality among the plurality of second cells. When a terminal accommodated in the first cell using the second frequency needs to be handed over to a second cell corresponding to the third frequency, the network device can determine the third frequency and the second cell corresponding to the first cell and the second frequency from the second target list and hand over the terminal from the first cell to the second cell. In this case, the terminal accesses the second cell using the third frequency.

[0063] For a terminal accommodated in a second cell at a third frequency, when the terminal needs to be handed over from the second cell to a first frequency of a first cell, a first mapping relationship needs to be configured in the network device. The network device can acquire measurement reports for a plurality of first cells corresponding to a plurality of second cells based on the first mapping relationship. After acquiring the measurement reports for the plurality of 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 a first cell, a first frequency, and a second cell and a third frequency corresponding to the first cell and the first frequency, which have good communication quality among the plurality of first cells. Then, when the terminal accommodated in the second cell needs to be handed over to the first frequency of the first cell, the network device can determine the first frequency and the first cell corresponding to the second cell and the third frequency from the third target cell list and handover the terminal from the second cell to the first cell. In this case, the terminal accesses the first cell at the first frequency.

[0064] For a terminal accommodated in a second cell using a third frequency, if the terminal needs to be handed over from the second cell to the second frequency of the first cell, a second mapping relationship needs to be configured in the network device. The network device can acquire measurement reports for a plurality of first cells corresponding to a plurality of second cells based on the second mapping relationship. After acquiring the measurement reports for the plurality of 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 a first cell having good communication quality among the plurality of first cells, a second frequency, and a second cell and a third frequency corresponding to the first cell and the second frequency. Then, if the terminal accommodated in the second cell needs to be handed over to the second frequency of the first cell, the network device can determine the second frequency and the first cell corresponding to the second cell and the third frequency from the fourth target cell list and handover the terminal from the second cell to the first cell. In this case, the terminal accesses the first cell using the second frequency.

[0065] In the present invention, to prevent a first terminal from being handed over from a first cell to a second cell after the first terminal accesses the first cell at a first frequency, and to prevent a second terminal from being handed over from a second cell to the first frequency of the first cell after the second terminal accesses the second cell at a third frequency, the first terminal is prevented from being handed over from the first cell to the second cell after the first terminal accesses the first cell at the first frequency, and the second terminal is prevented from being handed over to the first frequency of the second cell after the second terminal accesses the second cell at a third frequency. Therefore, in the network scheme shown in FIG. 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 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 selects to access the first cell at the first frequency, when the second terminal is handed over from the second cell to the first cell at the first frequency, it will affect the communication experience of high-speed rail users.

[0067] In addition, to avoid call dropping when the second terminal moves through an overlapping area between the first cell and the second cell, the network device enables handover of the second terminal from the second cell to the second frequency of the first cell when a call dropping risk occurs. Based on this, a second mapping relationship is configured in the network device. When a call dropping risk occurs for the second terminal, the network device can handover 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 frequency. In this case, the second SSB transmitted by the network device on the second frequency and the third SSB transmitted by the network device 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 by the first terminal on the third frequency are the same SSB.

[0069] The present application provides a communication method 300 for enabling a first terminal to preferentially access a first cell on a first frequency based on the network scheme shown in Figure 2. Figure 3 is a schematic flowchart of the communication method 300. The following describes the method in detail.

[0070] Step 301: A network device transmits a first SSB on a first frequency and a second SSB on a second frequency, where the first frequency and the second frequency correspond to a first cell, and the first cell is a cell that serves a first terminal.

[0071] Step 303: The network device transmits a third SSB on a third frequency, the third frequency corresponding to a second cell, the second cell being a cell serving a second terminal, and the moving speed of the second terminal being slower than the moving speed of the first terminal.

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

[0073] After the network device transmits the SSBs at the first frequency, the second frequency, and the third frequency, the first terminal can receive the SSBs and select to access the first cell at the first frequency. In this case, the first terminal can transmit a first request to the network device to request access to the first cell at the first frequency.

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

[0075] After the network device transmits the first SSB, the second SSB, and the third SSB on the first frequency, the second frequency, and the third frequency, the first SSB, the second SSB, and the third SSB can be received by a second terminal, and the second terminal can select to access the second cell on the third frequency. In this case, the second terminal can transmit a second request to the network device to request access to the second cell on the third frequency.

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

[0077] To allow the first terminal to preferentially select to access the first cell on 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 on the first frequency and a low transmission power for the second SSB transmitted on the second frequency, in which case the signal energy of the first SSB detected by the first terminal on the first frequency is high, and therefore the first terminal can select to access the first cell on the first frequency.

[0078] For example, in one implementation, the method 300 may further include: Step 302: The network device transmits a first identifier on a first frequency, where the first identifier indicates that the first cell is a cell serving the first terminal.

[0079] For example, to allow the first terminal to select to preferentially access the first cell on the first frequency, the network device may transmit a first identifier on the first frequency, and the first terminal may determine that the first cell is a cell that serves the first terminal based on the first identifier received on the first frequency. In this case, the first terminal accesses the first cell on the first frequency, and the accuracy of the first terminal accessing the first cell on the first frequency may be improved.

[0080] For example, the first identifier may be carried in a system information block (SIB), and the network device may broadcast the SIB to allow the first terminal to obtain the first identifier.

[0081] In this way, the method of selecting the first terminal to preferentially access the first cell on the first frequency may be used alone or in combination, and this is not a limitation in the present application.

[0082] When the network device transmits the first identifier, if the second terminal acquires the first identifier at the first frequency, the second terminal may determine that the first cell is a cell that serves the first terminal based on the first identifier received at the first frequency. In this case, the second terminal accesses the second cell at the third frequency, thereby improving the accuracy of the second terminal accessing the second cell at the third frequency.

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

[0084] Step 306: If the first terminal is accommodated 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 on the first frequency, the first terminal is erroneously 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, in one implementation, the network device can hand over the first terminal from the second cell to the first frequency of the first cell based on the third target cell list.

[0086] In another embodiment, the network device can hand over the first terminal to the second frequency of the first cell based on the 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, in one implementation, the method 300 may further include the following steps:

[0088] Step 307: If the second terminal is accommodated in the first cell on 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 accommodated in the first frequency of the first cell. For example, when the second terminal accesses the network for the first time, the second terminal 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 hand over the second terminal from the second frequency of the first cell to the second cell based on the second target cell list.

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

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

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

[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 realize the functions in the foregoing embodiments, the terminal includes corresponding hardware structures and / or software modules for performing the functions. Those skilled in the art should easily recognize that in the embodiments of the present application, the units and method steps in the examples described with reference to the embodiments disclosed in the embodiments of the present application can be implemented by hardware or a combination of hardware and computer software. Whether the functions are performed by hardware or hardware driven by computer software depends on the specific application scenario and design constraints of the technical solution.

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

[0096] 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 the network device, the first terminal, or the second terminal in the embodiment of the method shown in FIG.

[0097] When the communication device 400 is configured to implement the functionality of the network device in the embodiment of the method shown in FIG. 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 frequency and the second frequency correspond to a first cell, the first cell being a cell serving 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 serving a second terminal, the moving speed of the second terminal being slower than the moving speed of the first terminal. The first mapping relationship is not configured for 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 for 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 transceiver unit 410 is further configured to receive a first request from the first terminal. The first request is for access to the first cell on a first frequency. The transceiver unit 410 is further configured to receive a second request from a second terminal. The second request is for access to the second cell on a third frequency.

[0098] When the communication device 400 is configured to implement the functionality of the first terminal in the embodiment of the method shown in FIG. 3 , the transceiver unit 410 is configured to receive SSBs at a first frequency and a second frequency from a network device. The first frequency and the second frequency correspond to a first cell, and the first cell is a cell serving the first terminal. A first mapping relationship is not configured for the network device, and the first mapping relationship includes a correspondence between the first cell, the first frequency, the second cell, and a third frequency. A second mapping relationship is configured for 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 a second cell, and the second cell is a cell serving the second terminal. The moving speed of the second terminal is lower than the moving speed 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 at the first frequency.

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

[0100] 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 to be executed by the processor 510, to store input data required for the processor 510 to execute the instructions, and to store data generated after the processor 510 executes the instructions.

[0101] When the communications device 500 is configured to implement the method shown in FIG. 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] When the communication device is a chip used in a network device, the chip in the network device realizes the function of the network device in the above method embodiment. The chip in the network device receives information from another module (e.g., a radio frequency module or an antenna) in the network device, and the information is transmitted to the network device by the terminal device. Alternatively, the chip in the network device transmits information to another module (e.g., a radio frequency module or an antenna) in the network device, and the information is transmitted to the terminal device by the network device.

[0103] When the communication device is a chip used in a terminal device, the chip in the terminal device realizes the functions of the terminal device in the above method embodiments. The chip in the terminal device receives information from another module (e.g., a radio frequency module or an antenna) in the terminal device, and the information is transmitted to the terminal device by the network device. Alternatively, the chip in the terminal device transmits information to another module (e.g., a radio frequency module or an antenna) in the terminal device, 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 may be another general-purpose processor, a Digital Signal Processor (DSP), an Application-Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other 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 the present application may be implemented in hardware or software instructions that can be executed by a processor. The software instructions may include corresponding software modules. The software modules may be stored in a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an electrically erasable programmable read-only memory, a register, a hard disk, a removable hard disk, a CD-ROM, or any other form of storage medium well known in the art. For example, the storage medium is coupled to the processor such that the processor can read information from and write information to the storage medium. The storage medium may alternatively be components of the processor. The processor and the storage medium may be located in an ASIC. Further, the ASIC may be located in a terminal. The processor and the storage medium may alternatively exist as separate components in the terminal.

[0106] All or part of the above-described embodiments 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. The computer program product includes one or more computer programs or instructions. When the computer programs or instructions are loaded and executed on a computer, the procedures or functions of the embodiments of the present application are executed in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, or another programmable device. The computer program or instructions may be stored in a computer-readable storage medium or transmitted from a computer-readable storage medium to another computer-readable storage medium. For example, the computer program or instructions may be transmitted from a website, computer, server, or data center to another website, computer, server, or data center via a wired or wireless method. 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 that integrates one or more available media. The usable medium may be a magnetic medium such as a floppy disk, hard disk, or magnetic tape, or an optical medium such as a digital video disk, or a semiconductor medium such as a solid-state drive. The computer-readable storage medium may be a volatile or non-volatile storage medium, or may include two types of storage media: volatile and non-volatile storage media.

[0107] In each embodiment of the present application, unless otherwise specified or there is no logical contradiction, the terms and / or descriptions between different embodiments are consistent and can be cross-referenced, and the technical features in different embodiments can be combined based on their internal logical relationships to form a new embodiment.

[0108] In the embodiments of the present application, "at least one" means one or more, and "multiple" means two or more. "And / or" describes an association 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 is present, A and both are present, and only B is present, where A and B may be singular or plural. In the description of the embodiments of the present application, the character " / " generally indicates that the associated objects are in an "or" relationship. In the formula of the embodiments of the present application, the character " / " indicates that the associated objects are in a "division" relationship. "Comprising at least one of A, B, and C" can represent the following: including A; including B; including C; including A and B; including A and C; including B and C; and including A, B, and C.

[0109] It should be further understood that various numbers in the embodiments of the present application are distinguished merely for ease of description and are not used to limit the scope of the embodiments of the present application. The sequence numbers of the above processes do not mean the execution sequence, and the execution sequence of the processes should be determined based on the function and internal logic of the processes.

Claims

1. A communication method applied to a network device, comprising: transmitting a first SSB on a first frequency and a second SSB on a second frequency, the first frequency and the second frequency corresponding to a first cell, the first cell being a cell serving a first terminal; Transmitting a third SSB on a third frequency, the third frequency corresponding to a second cell, the second cell being a cell serving a second terminal, and the moving speed of the second terminal being lower than the moving speed of the first terminal; a first mapping relationship is not configured for the network device, the first mapping relationship including 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, the second mapping relationship including a correspondence between the first cell, the second frequency, the second cell, and the third frequency; receiving a first request from the first terminal, the first request requesting access to the first cell on the first frequency; receiving a second request from the second terminal, the second request requesting access to the second cell on the third frequency; A method comprising:

2. 2. The method of claim 1, wherein a first transmit power is greater than a second transmit power, the first transmit power being the transmit power used when the first SSB is transmitted on the first frequency, and the second transmit power being the transmit power used when the second SSB is transmitted on the second frequency.

3. 2. The method of claim 1, further comprising transmitting a first identifier on the first frequency, the first identifier indicating that the first cell is a cell serving the first terminal.

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

5. The method comprises: If the first terminal is accommodated in the second cell, handing over the first terminal from the second cell to the first frequency of the first cell; The method of claim 1 further comprising:

6. The method comprises: handing over the second terminal from the first cell to the second cell when the second terminal is accommodated in the first cell on the first frequency; The method of claim 1 further comprising:

7. A communication method, applied to a first terminal, comprising: receiving a first SSB from a network device on a first frequency and a second SSB from the network device on a second frequency, the first frequency and the second frequency corresponding to a first cell, the first cell being a cell serving the first terminal; a first mapping relationship is not configured for the network device, the first mapping relationship including a correspondence between the first cell, the first frequency, the second cell, and a third frequency; a second mapping relationship is configured for the network device, the second mapping relationship including a correspondence between the first cell, the second frequency, the second cell, and the third frequency, the third frequency corresponding to the second cell, the second cell being a cell serving a second terminal, and a moving speed of the second terminal being lower than a moving speed of the first terminal; sending a first request to the network device, the first request requesting access to the first cell on the first frequency; A method comprising:

8. 8. The method of claim 7, wherein a first transmit power is greater than a second transmit power, the first transmit power being the transmit power used when the first SSB is transmitted on the first frequency, and the second transmit power being the transmit power used when the second SSB is transmitted on the second frequency.

9. The method comprises: receiving a first identifier transmitted by the network device on the first frequency, the first identifier indicating that the first cell is a cell serving the first terminal; The method of claim 7 , wherein sending a first request to the network device comprises sending the first request to the network device based on the first identifier.

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

11. A communication method, applied to a second terminal, comprising: receiving a third SSB from a network device on a third frequency, the third frequency corresponding to a second cell, the second cell being a cell serving the second terminal; a first mapping relationship is not configured for the network device, the first mapping relationship including a correspondence between a first cell, a first frequency, the second cell, and the third frequency; a second mapping relationship is configured for the network device, the second mapping relationship including 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 serving a first terminal, and a moving speed of the second terminal is lower than a moving speed of the first terminal; sending a second request to the network device, the second request requesting access to the second cell on the third frequency; A method comprising:

12. 12. The method of claim 11, wherein the first transmit power is greater than the second transmit power, the first transmit power being the transmit power used when a first SSB is transmitted to the first terminal on the first frequency, and the second transmit power being the transmit power used when a second SSB is transmitted to the first terminal on the second frequency.

13. The method comprises: receiving a first identifier transmitted by the network device on the first frequency, the first identifier indicating that the first cell is a cell serving the first terminal; The method of claim 11 , wherein sending the second request to the network device comprises sending the second request to the network device based on the first identifier.

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

15. A communications device comprising a processor and an interface circuit, the interface circuit being configured to receive signals from other communications devices and transmit the signals to the processor, or to transmit signals from the processor to other communications devices, the processor being configured to perform the method of any one of claims 1 to 6 using logic circuits or by executing code instructions, or to perform the method of any one of claims 7 to 10, or to perform the method of any one of claims 11 to 14.

16. A communications device comprising a unit configured to perform the method according to any one of claims 1 to 6, or comprising a unit configured to perform the method according to any one of claims 7 to 10, or comprising a unit configured to perform the method according to any one of claims 11 to 14.

17. 13. A computer-readable storage medium having stored thereon a computer program or instructions, the computer program or instructions being executed by a communications device to perform the method of any one of claims 1 to 6, to perform the method of any one of claims 7 to 10, or to perform the method of any one of claims 11 to 14.

18. 1. A computer program product comprising computer readable instructions which, when executed on a computer, perform the method of any one of claims 1 to 6, perform the method of any one of claims 7 to 10, or perform the method of any one of claims 11 to 14.

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