WO2021062599A1

WO2021062599A1 - Communication method and apparatus, cell measurement method

Info

Publication number: WO2021062599A1
Application number: PCT/CN2019/109374
Authority: WO
Inventors: 郑黎丽; 耿婷婷; 吴烨丹; 张宏平
Original assignee: 华为技术有限公司
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2021-04-08
Also published as: CN114424619A

Abstract

The present application provides a communication method and apparatus. The method may comprise: a terminal device receiving time information corresponding to at least one frequency point on satellite ephemeris of a satellite, and the terminal device determining, according to the satellite ephemeris, information such as a trajectory of the satellite; the terminal device determining, according to a certain time, such as the current time, and time information corresponding to at least one frequency point, frequency point information to be measured currently, and also determining frequency point information to be measured when the terminal device reselects another cell. The method can reduce signaling overheads caused by a terminal device requesting a system message many times, thereby helping the terminal device to save power.

Description

Communication method, cell measurement method and communication device

Technical field

This application relates to the field of communication, and specifically to a communication method, a cell measurement method, and a communication device.

Background technique

The ground communication system cannot achieve true "seamless coverage". For example, in rural areas with low population density, there are usually not enough cellular networks. For example, it is impossible to achieve communication through terrestrial networks in the maritime or aviation fields.

Due to the "ubiquitous" and "direct-to-user" characteristics of satellite communications, satellite communications technology has developed rapidly in areas such as satellite TV live broadcast services, mobile satellite services, Internet access, private networks, and military communications. Therefore, in the discussion of the fifth generation (5th generation, 5G) system in the 3rd generation partnership project (3GPP) agreement, satellites will be used as a new access method.

Then, in satellite communications, in some scenarios, such as cell selection or reselection, how to determine a cell becomes an urgent problem to be solved.

Summary of the invention

This application provides a communication method, a cell measurement method, and a communication device, in order to use the characteristics of satellite communication to determine a cell in satellite communication, and further reduce the signaling overhead caused by multiple requests for broadcast cell information by terminal equipment.

In the first aspect, a communication method is provided. The method may be executed by a terminal device, or may also be executed by a chip or circuit configured in the terminal device, which is not limited in this application.

The method may include: receiving time information corresponding to at least one frequency point on the satellite ephemeris of the satellite; and determining at least one frequency point corresponding to the satellite according to the first time and the time information corresponding to the at least one frequency point.

Optionally, the terminal device is in an idle state or an inactive state.

Optionally, the time information corresponding to at least one frequency point may include time information corresponding to one frequency point or multiple frequency points.

Optionally, the time information corresponding to at least one frequency point may be included in a radio resource control (radio resource control, RRC) message (for example, when a terminal device enters an idle state or inactive from a connected state) Status, received RRC release (release) message) or broadcast message.

Optionally, the time information corresponding to the at least one frequency point may be time information at which the terminal device measures the at least one frequency point. For example, the terminal equipment measures the time information of each frequency point. Alternatively, the time information corresponding to at least one frequency point can also be understood as the neighbor cell information required for cell reselection acquired by the terminal device in the serving cell, including not only the neighbor cell that the current serving cell of the terminal device needs to measure, but also the terminal The neighbor cell information that needs to be measured after the device selects other cells as the serving cell.

Optionally, the time information corresponding to the at least one frequency point is valid in an area specific. In other words, each cell in the area can broadcast the time information corresponding to the at least one frequency point.

Optionally, the frequency point corresponding to the satellite may indicate the frequency point on the satellite ephemeris of the satellite, or the frequency point distributed or deployed in the satellite network, or the frequency point distributed or deployed under the satellite. point.

Optionally, the terminal device determines at least one frequency point, and the at least one frequency point may be a frequency point used for measurement. That is, the terminal device determines at least one frequency point to be measured according to the first moment and the time information corresponding to the at least one frequency point.

Optionally, the first moment may be any moment, for example, the first moment may be the current moment.

Based on the above technical solution, considering that the satellite orbit has a certain law, the frequency point distribution on the satellite ephemeris also has a certain law, therefore, the characteristics of satellite communication can be used to determine at least one frequency point corresponding to the satellite. Determining the frequency point can also be understood as determining the cell under the frequency point. For example, the terminal device can determine one or more cells based on the time information corresponding to at least one frequency point. With this solution, when a terminal device wants to determine a cell, for example, when determining a cell for measurement, it does not need to request broadcast cell information from the network device every time, and it can further save the signaling overhead caused by multiple requests for broadcast cell information. And it can also help terminal equipment to save power.

With reference to the first aspect, in some implementations of the first aspect, the method further includes: receiving the satellite ephemeris, where the satellite ephemeris is used to indicate information about the orbit of the satellite; Time and time information corresponding to the at least one frequency point, determining at least one frequency point corresponding to the satellite, including: according to the satellite ephemeris, the first time, and time information corresponding to the at least one frequency point To determine at least one frequency point corresponding to the satellite.

Optionally, the terminal device can calculate the satellite's trajectory and time information based on satellite ephemeris (ephemeris information).

With reference to the first aspect, in some implementations of the first aspect, the time information corresponding to the at least one frequency point includes: the time period corresponding to each frequency point in the at least one frequency point, or N groups of frequency points The time period corresponding to each group of frequency points in the points; wherein the at least one frequency point includes the N groups of frequency points, the N groups of frequency points include at least one frequency point corresponding to the satellite, and N is greater than 1 or An integer equal to 1.

Optionally, the time information corresponding to the at least one frequency point includes: a time period corresponding to each frequency point in the at least one frequency point. For example, the terminal device can determine the time period for measuring each frequency point according to the time information corresponding to each frequency point. For example, the terminal device determines the frequency point that needs to be measured at the current time according to the current time and one or at least one frequency point corresponding to the time period in which the current time is located.

Optionally, the time information corresponding to at least one frequency point includes: a time period corresponding to each group of frequency points in the N groups of frequency points. For example, the terminal device can determine the time for measuring each group of frequency points according to the time information corresponding to each group of frequency points. For example, the terminal device determines the frequency points that need to be measured at the current time according to the current time and one or more sets of frequency points corresponding to the time period in which the current time is located.

With reference to the first aspect, in some implementation manners of the first aspect, the time information corresponding to the at least one frequency point includes: information about measuring the time of each frequency point in the at least one frequency point.

Optionally, at different times, the frequency of the serving cell or camping cell of the terminal device may be different. Measuring the time information of each frequency point in at least one frequency point can also be understood as that the frequency point information obtained by the terminal equipment not only includes the neighboring cell information that the current serving cell needs to measure, but also includes the terminal equipment reselecting to other cells Neighbor cell information that needs to be measured at the time.

Based on the above technical solution, the neighboring cell information required for cell reselection obtained by the terminal equipment in the serving cell not only includes the neighboring cells that the terminal equipment needs to measure in the serving cell, but also includes the information that the terminal equipment needs to measure after reselecting to another cell. Neighborhood. Therefore, based on the time information corresponding to at least one frequency point and the first moment (such as the current moment), the terminal device can determine the frequency points that need to be measured at different times. In this way, through the broadcast message of the serving cell (or the camping cell), the time information corresponding to at least one frequency point required for cell reselection can be obtained, and the information caused by the terminal device's multiple requests for system messages can be further reduced. Make the cost, help the terminal equipment to save power.

With reference to the first aspect, in some implementations of the first aspect, the at least one frequency point corresponding to the satellite includes: one or at least one frequency point corresponding to the first moment, and/or, the M groups of frequency points corresponding to M time periods after the first time, wherein each time period of the M time periods corresponds to a group of frequency points, and M is an integer greater than or equal to 1.

Based on the above technical solution, the neighbor cell information required for cell reselection acquired by the terminal device in the serving cell includes not only the neighbor cell that the terminal device needs to measure in the current serving cell, but also the neighbor cell that the terminal device needs to measure when the serving cell of the terminal device is another cell. Neighborhood information.

With reference to the first aspect, in some implementations of the first aspect, the method further includes: measuring the frequency point corresponding to the first moment; and/or, in each of the M time periods Measure the frequency point corresponding to each time period.

Optionally, measuring the frequency points corresponding to each time period in each time period can be understood to mean that when the serving cell of the terminal device is a different cell, the measurement of the neighboring cell required by the terminal device in the cell is measured.

With reference to the first aspect, in some implementations of the first aspect, the M time periods include a first time period and a second time period, and the first time period is before the second time period; the The frequency points corresponding to the second time period include: frequency points that have an association relationship with all frequency points or part of the frequency points corresponding to the first time period.

The associated frequency points can represent the frequency points that may be included in the trajectory of the terminal device as the satellite runs.

For example, assuming the first time period, the frequency points on the running track of the terminal device may include: frequency point 1, frequency point 7, and frequency point 3.

For an example, in the case that the frequency points corresponding to the second time period include frequency points that are associated with all frequency points corresponding to the first time period, the frequency points corresponding to the second time period may include: Frequency point, frequency point associated with frequency point 7, and frequency point associated with frequency point 3.

In another example, in the case where the frequency points corresponding to the second time period include frequency points that are associated with part of the frequency points corresponding to the first time period, the frequency points corresponding to the second time period may include any one or both of the following: Items: frequency points associated with frequency point 1, frequency points associated with frequency point 7, and frequency points associated with frequency point 3.

Among them, the frequency point associated with frequency point 1 refers to the frequency points that may be included in the operation trajectory of the terminal equipment when the serving cell of the terminal device is the cell of frequency point 1, as the satellite runs. The frequency point associated with frequency point 7 refers to the frequency points that may be included in the operation trajectory of the terminal equipment when the serving cell of the terminal device is the cell of frequency point 7, with the operation of the satellite. The frequency point associated with frequency point 3, that is, when the serving cell of the terminal equipment is the cell of frequency point 3, as the satellite runs, the frequency points that may be included in the running track of the terminal equipment.

In the second aspect, a communication method is provided. The method may be executed by a network device, or may also be executed by a chip or circuit configured in the network device, which is not limited in this application.

The method may include: generating time information corresponding to at least one frequency point on the satellite ephemeris of the satellite, where the time information corresponding to the at least one frequency point can be used to determine at least one frequency point corresponding to the satellite; and sending the Time information corresponding to at least one frequency point.

Based on the above technical solution, considering that the satellite's orbit has a certain law, and the frequency point distribution on the satellite ephemeris also has a certain law, therefore, the characteristics of satellite communication can be used to determine at least one frequency point corresponding to the satellite. The network device (such as the current serving cell) can notify the terminal device of the time information corresponding to at least one frequency point, so that the terminal device can determine at least one frequency point corresponding to the satellite based on the time information corresponding to the at least one frequency point. With this solution, when a terminal device wants to determine a cell, for example, when determining a cell for measurement, it does not need to request broadcast cell information from the network device every time, and it can further reduce the signaling caused by multiple requests for broadcast cell information by the terminal device. Cost, but also can help terminal equipment to save power.

With reference to the second aspect, in some implementations of the second aspect, the method further includes: sending the satellite ephemeris, where the satellite ephemeris is used to indicate information about the orbit of the satellite.

With reference to the second aspect, in some implementations of the second aspect, the time information corresponding to the at least one frequency point includes: the time period corresponding to each frequency point in the at least one frequency point, or N groups of frequency points The time period corresponding to each group of frequency points in the points; wherein the at least one frequency point includes the N groups of frequency points, the N groups of frequency points include at least one frequency point corresponding to the satellite, and N is greater than 1 or An integer equal to 1.

With reference to the second aspect, in some implementations of the second aspect, the time information corresponding to the at least one frequency point includes: information about measuring the time of each frequency point in the at least one frequency point.

Based on the above technical solution, the network device notifies the terminal device of the neighboring cell information, including not only the neighboring cell that the terminal device needs to measure in the serving cell, but also the neighboring cell that the terminal device needs to measure after reselecting to another cell. Therefore, based on the time information corresponding to at least one frequency point and the first moment (such as the current moment), the terminal device can determine the frequency points that need to be measured at different times. In this way, through the broadcast message of the serving cell (or the camping cell), the time information corresponding to at least one frequency point required for cell reselection can be obtained, and the information caused by the terminal device's multiple requests for system messages can be further reduced. Make the cost, help the terminal equipment to save power.

With reference to the second aspect, in some implementations of the second aspect, the at least one frequency point corresponding to the satellite includes: one or at least one frequency point corresponding to the first moment, and/or, the M groups of frequency points corresponding to M time periods after the first time, wherein each time period of the M time periods corresponds to a group of frequency points, and M is an integer greater than or equal to 1.

With reference to the second aspect, in some implementations of the second aspect, the M time periods include a first time period and a second time period, and the first time period is before the second time period; The frequency points corresponding to the second time period include: frequency points that have an association relationship with all frequency points or part of the frequency points corresponding to the first time period.

In the third aspect, a method for cell measurement is provided. The method may be executed by a terminal device, or may also be executed by a chip or circuit configured in the terminal device, which is not limited in this application.

The method may include: when the cell quality of the serving cell is less than the first threshold, measuring the neighboring cell; when the cell quality of the neighboring cell is greater than or equal to the second threshold, or the cell quality difference is greater than or equal to the first threshold. In the case of three thresholds, reselect to the neighboring cell; wherein, the cell quality difference is the difference between the cell quality of the neighboring cell and the cell quality of the serving cell, and the serving cell and the serving cell The neighboring cell is a satellite cell.

Optionally, the first threshold, the second threshold, and the third threshold may be predetermined, such as a protocol or a network device, or may be configured by a network device, which is not limited.

Based on the above technical solution, in satellite communications, the terminal equipment can perform simple cell reselection. For example, when the quality of the serving cell measured by the terminal device is less than a certain threshold, the terminal device measures the neighboring cell. For another example, as long as there is a suitable neighboring cell, the terminal device can reselect the neighboring cell, if the quality of the neighboring cell is higher than a certain threshold, or the quality of the neighboring cell is higher than the quality of the serving cell, or The quality of the neighboring cell is higher than the quality of the serving cell by a certain threshold, and so on. It can further reduce unnecessary measurements and help save power for terminal equipment.

With reference to the third aspect, in some implementation manners of the third aspect, the first threshold is equal to the second threshold.

In other words, as long as the quality of a cell is higher than the quality of the serving cell, the terminal device can reselect the cell.

In a fourth aspect, a communication device is provided, and the communication device is configured to execute the communication method provided in the first aspect or the third aspect. Specifically, the communication device may include a module for executing the communication method provided in the first aspect or the third aspect. The communication device may be a terminal device, a chip or a circuit configured in the terminal device, or a device including a terminal device.

In a fifth aspect, a communication device is provided, and the communication device is configured to execute the method provided in the second aspect. Specifically, the communication device may include a module for executing the method provided in the second aspect. The communication device may be a network device, a chip or circuit configured in the network device, or a device including a network device.

In a sixth aspect, a communication device is provided, including a processor. The processor is coupled with the memory and can be used to execute instructions in the memory to implement the method in any one of the first aspect or the third aspect described above in the first aspect or the third aspect. Optionally, the communication device further includes a memory. Optionally, the communication device further includes a communication interface, the processor is coupled with the communication interface, and the communication interface is used to input and/or output information. The information includes at least one of instructions and data.

In an implementation manner, the communication device is a terminal device. When the communication device is a terminal device, the communication interface may be a transceiver, or an input/output interface.

In another implementation manner, the communication device is a chip or a chip system. When the communication device is a chip or a chip system, the communication interface may be an input/output interface, which may be an input/output interface, interface circuit, output circuit, input circuit, pin, or related circuit on the chip or chip system, etc. . The processor may also be embodied as a processing circuit or a logic circuit.

In another implementation manner, the communication device is a chip or a chip system configured in a terminal device.

Optionally, the transceiver may be a transceiver circuit. Optionally, the input/output interface may be an input/output circuit.

In a seventh aspect, a communication device is provided, including a processor. The processor is coupled to the memory and can be used to execute instructions in the memory to implement the foregoing second aspect and the method in any one of the possible implementation manners of the second aspect. Optionally, the communication device further includes a memory. Optionally, the communication device further includes a communication interface, the processor is coupled with the communication interface, and the communication interface is used to input and/or output information. The information includes at least one of instructions and data.

In one implementation, the communication device is a network device. When the communication device is a network device, the communication interface may be a transceiver, or an input/output interface.

In another implementation manner, the communication device is a chip or a chip system. When the communication device is a chip or a chip system, the communication interface may be an input/output interface, interface circuit, output circuit, input circuit, pin or related circuit on the chip or chip system. The processor may also be embodied as a processing circuit or a logic circuit.

In another implementation manner, the communication device is a chip or a chip system configured in a network device.

In an eighth aspect, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a communication device, the communication device realizes the first aspect or the third aspect, and the first or third aspect. The method in any possible implementation of the three aspects.

In a ninth aspect, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a communication device, the communication device realizes the second aspect and any possible implementation of the second aspect The method in the way.

In a tenth aspect, a computer program product containing instructions is provided, which when executed by a computer causes a communication device to implement the method provided in the first aspect or the third aspect.

In an eleventh aspect, a computer program product containing instructions is provided, which when executed by a computer causes a communication device to implement the method provided in the second aspect.

In a twelfth aspect, a communication system is provided, including the aforementioned network equipment and terminal equipment.

Description of the drawings

Figures 1 to 4 are schematic diagrams of satellite communications applicable to embodiments of the present application.

Figures 5 and 6 are schematic diagrams of an IAB system applicable to embodiments of the present application.

Fig. 7 is a schematic diagram of a network architecture applicable to an embodiment of the present application.

Fig. 8 is a schematic diagram of a communication method applicable to an embodiment of the present application.

FIG. 9 and FIG. 10 are schematic diagrams of frequency point distribution applicable to the embodiments of the present application.

FIG. 11 is a schematic diagram of a communication method suitable for another embodiment of the present application.

FIG. 12 is a schematic diagram of a cell measurement method applicable to another embodiment of the present application.

Fig. 13 is a schematic diagram of a serving cell and a neighboring cell applicable to another embodiment of the present application.

FIG. 14 is a schematic block diagram of a communication device provided by an embodiment of the application.

FIG. 15 is a schematic block diagram of another communication device according to an embodiment of the application.

FIG. 16 is a schematic block diagram of a terminal device provided by an embodiment of the application.

FIG. 17 is a schematic block diagram of a network device provided by an embodiment of the application.

Detailed ways

The technical solution in this application will be described below in conjunction with the accompanying drawings.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of this application. The terminology used in the specification of the application herein is only for the purpose of describing specific embodiments, and is not intended to limit the application.

In order to better understand the embodiments of the present application, the following first introduces the communication systems to which the embodiments of the present application are applicable and related concepts.

The technical solutions of the embodiments of the present application can be applied to various communication systems, for example, long term evolution (LTE) systems, fifth generation mobile communication (the 5th Generation, 5G) systems, and machine to machine communication (machine to machine). , M2M) system, non-terrestrial network (NTN) system, or other communication systems that will evolve in the future. Among them, the 5G wireless air interface technology is called a new radio (NR), and the 5G system can also be called an NR system. The NTN system can also be called a satellite communication system. In addition, the non-ground communication system may also include a high altitude platform (HAPS) communication system.

Terrestrial communication systems sometimes fail to achieve true "seamless coverage". For example, in rural areas with low population densities, there are usually not enough cellular networks. For another example, in the maritime and aviation fields, it is even more impossible to achieve communication through terrestrial networks. Due to the "ubiquitous" and "direct-to-user" characteristics of satellite communications, satellite communications technology has developed rapidly in areas such as satellite TV live broadcast services, mobile satellite services, Internet access, private networks, and military communications.

According to the height of the satellite, that is, the height of the satellite orbit, the satellite system can be divided into low earth orbit (LEO), medium earth orbit (MEO), and high orbit satellite (geostationary earth orbit, GEO) (or called For geostationary orbit satellites).

Among them, in one possible way, the LEO satellite height is about 300 kilometers (km)-1500km. The satellite altitude of MEO is between LEO and GEO. In GEO, the speed of the satellite is the same as the rotation speed of the earth and remains stationary relative to the ground; the height of the satellite is about 35768km. The embodiment of this application does not limit the division manners of GEO, MEO and LEO.

Figures 1 to 4 show several schematic architecture diagrams of satellite communications applicable to embodiments of the present application.

Figure 1 shows a radio access network (RAN) architecture (RAN architecture with transparent satellite) with transparent satellites.

As shown in Figure 1, in this scenario, it may include: user equipment (UE), satellite, NTN gateway (gateway), base station (such as NR base station (next generation node B, gNB)), 5G core network ( core network (CN), data network (data network).

Among them, the data network may be a network used to provide transmission data. For example, the network of the operator's business, the Internet network, the business network of a third party, and so on.

Among them, the UE may be various mobile terminals, such as a mobile satellite phone, or various fixed terminals, such as a communication ground station.

The terminal can be a wireless terminal or a wired terminal. A wireless terminal may be a device that provides voice and/or data connectivity to a user, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem. The wireless terminal can communicate with one or more core networks via the RAN. The wireless terminal can be a mobile terminal, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal. For example, it can be a portable, pocket-sized, handheld, built-in computer or vehicle-mounted mobile device. The access network exchanges language and/or data. For example, personal communication service (PCS) phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants, PDA) and other equipment. A wireless terminal can also be called a system, a subscriber unit (SU), a subscriber station (SS), a mobile station (MB), a mobile station (Mobile), a remote station (remote station, RS), Access point (access point, AP), remote terminal (remote terminal, RT), access terminal (access terminal, AT), user terminal (user terminal, UT), user agent (user agent, UA), terminal equipment ( user device, UD). Terminal equipment represented by satellite phones and vehicle-mounted satellite systems can communicate directly with satellites. The fixed terminal represented by the ground communication station needs to be relayed by the ground station before it can communicate with the satellite. The terminal equipment realizes the setting and acquisition of the communication state by installing a wireless transceiver antenna, and completes the communication.

Among them, the satellite can be composed of a geostationary satellite (GEO) or a non-geostationary (none-geostationary earth orbit, NGEO) satellite (such as LEO or MEO), or can also be composed of multiple satellite networks composed of both.

In the transparent scenario shown in FIG. 1, the satellite is mainly used as a relay (L1 relay) of layer 1 (layer 1, L1), and the physical layer signal can be regenerated, and the upper layer is not visible. The role of satellites may include, but is not limited to: radio frequency filtering, frequency conversion and amplification. In Figure 1, satellites can transmit downlink data to terminal equipment.

Satellites and NTN gateways can be used as remote radio units (RRU). The satellite and NTN gateway can communicate through Uu interface (such as NR Uu interface). The gNB and the core network can communicate through the NG interface. The core network and the data network can communicate through the N6 interface.

In Figure 2, Regenerative satellite (Regenerative satellite) does not have inter-satellite link (ISL) (Regenerative satellite without ISL).

As shown in Figure 2, in this scenario, it may include: UE, satellite, NTN gateway, 5G core network, and data network.

For the introduction of each network element, you can refer to the description in FIG. 1, which will not be repeated here.

In satellite communication systems, satellites can also be called satellite base stations. In the scenario shown in Figure 2, the satellite can be used as a gNB. When a satellite is used as a gNB, the function of the satellite is similar to an ordinary gNB. For example, the satellite acts as a gNB and can handle payloads.

The satellite and the NTN gateway can communicate through the NG interface on the Satellite Radio Interface (SRI). The satellite and the core network can communicate through the NG interface. The core network and the data network can communicate through the N6 interface.

In Figure 2, the dotted line refers to the communication signal between the satellite and the terminal. In Figure 2, the satellite base station can transmit downlink data to terminal equipment. Among them, the downlink data can be transmitted to the terminal device after channel coding and modulation mapping. The terminal equipment can also transmit uplink data to the satellite base station. Among them, the uplink data can also be transmitted to the satellite base station after channel coding, modulation and mapping.

In Figure 2, the solid line refers to the communication signal between the satellite and the equipment on the ground segment, and the communication signal between the network elements on the ground segment.

In Figure 3, the regenerative satellite has ISL.

As shown in Figure 3, in this scenario, it may include: UE, satellite, NTN gateway, 5G core network, and data network.

In the scenario shown in Figure 3, the satellite can be used as a gNB. When a satellite is used as a gNB, the function of the satellite is similar to an ordinary gNB. For example, the satellite acts as a gNB and can handle payloads.

In the scenarios shown in Figure 2 and Figure 3, satellites can be used as gNB. The difference is that there is no ISL in the scene shown in FIG. 2 and there is ISL in the scene shown in FIG. 3.

The satellite and the satellite can communicate through the Xn interface on the ISL. The satellite and NTN gateway can communicate through the NG interface on the SRI. The satellite and the core network can communicate through the NG interface. The core network and the data network can communicate through the N6 interface.

In Figure 3, the dotted line refers to the communication signal between the satellite and the terminal. In Figure 3, the satellite base station can transmit downlink data to the terminal equipment. Among them, the downlink data can be transmitted to the terminal device after channel coding and modulation mapping. The terminal equipment can also transmit uplink data to the satellite base station. Among them, the uplink data can also be transmitted to the satellite base station after channel coding, modulation and mapping.

In Figure 3, the solid line refers to the communication signal between the satellite and the equipment on the ground segment, the communication signal between the network elements on the ground segment, and the communication signal between the satellite and the satellite.

Figure 4 shows a NG-RAN architecture (NG-RAN with a regenerative satellite based on gNB-DU) based on the gNB-DU regenerative satellite.

As shown in Figure 4, this scenario may include: UE, satellite, NTN gateway, centralized unit (CU) (such as gNB-CU), 5G core network, and data network.

In the scenario shown in FIG. 4, the satellite can be used as a distributed unit (DU) (such as gNB-DU). When a satellite is used as a gNB-DU, the function of the satellite is similar to a common distributed unit (DU).

The satellite and NTN gateway can communicate through the F1 interface on the SRI. The satellite and gNB-CU (that is, between gNB-DU and gNB-CU) can communicate through the F1 interface. The core network and the data network can communicate through the N6 interface.

In Figure 4, the dashed line refers to the communication signal between the satellite and the terminal. In Figure 4, the satellite base station can transmit downlink data to the terminal equipment. Among them, the downlink data can be transmitted to the terminal device after channel coding and modulation mapping. The terminal equipment can also transmit uplink data to the satellite base station. Among them, the uplink data can also be transmitted to the satellite base station after channel coding, modulation and mapping.

In Figure 4, the solid line refers to the communication signal between the satellite and the equipment on the ground segment, and the communication signal between the network elements on the ground segment.

It should be understood that FIGS. 1 to 4 are only exemplary illustrations, and the embodiments of the present application are not limited thereto. For example, FIG. 1 to FIG. 4 may include a larger number of terminal devices. For another example, more NTN gateways may be included in FIGS. 1 to 4.

It should also be understood that the foregoing four scenarios are exemplarily introduced in conjunction with FIG. 1 to FIG. 4, and the embodiment of the present application is not limited thereto. For example, satellites can also be used as integrated access and backhaul (IAB) nodes.

The IAB node is used to provide a wireless backhaul service for a node (for example, a terminal) that wirelessly accesses the wireless backhaul node. Among them, the wireless backhaul service refers to the data and/or signaling backhaul service provided through the wireless backhaul link. The IAB node is a specific name of a relay node, and does not limit the solution of the application. It may be one of the above-mentioned base stations or terminal devices with a forwarding function, or it may be an independent device form. In a network containing IAB nodes (for example, IAB network for short), the IAB node can provide wireless access services for the terminal, and is connected to a donor base station (donor gNB) through a wireless backhaul link to transmit user service data.

Exemplarily, the IAB node may also be a customer premise equipment (customer premises equipment, CPE), a residential gateway (residential gateway, RG) and other equipment. In this case, the method provided in the embodiment of the present application can also be applied in a home access scenario.

As can be seen from the above, the architecture of satellite communications can generally be divided into the following two categories.

One is transparent, that is, the satellite is used as a relay, which can be used for radio frequency filtering, amplification, etc., to regenerate the signal).

The second is regenerative, that is, satellites can do gNB, DU, and relay. In this type of architecture, when a satellite is used as a relay, it is not only a relay, but also has signal processing functions, similar to IAB.

Figures 5 and 6 show schematic diagrams of an IAB system applicable to embodiments of the present application.

IAB technology refers to the use of wireless transmission solutions for both the access link and the backhaul link to avoid optical fiber deployment.

In an IAB network, a relay node (RN) or IAB node (IAB node) can provide wireless access services for terminal equipment, and the service data of the terminal equipment can be transmitted back wirelessly by one or more IAB nodes The link is connected to a donor node (IAB donor) or a donor base station (donor gNodeB, DgNB) for transmission.

As shown in Figure 5, an IAB system includes at least one base station 500, and one or more terminal devices 501 served by the base station 500, one or more relay nodes (that is, IAB nodes) 510, and the IAB node 510. One or more terminal devices 511 serving. The IAB node 510 is connected to the base station 500 through a wireless backhaul link 513. Generally, the base station 500 is referred to as a donor base station. Alternatively, the donor base station is also referred to as a donor node or an IAB donor (IAB donor) in this application. In addition, the IAB system may also include one or more intermediate IAB nodes. For example, IAB node 520 and IAB node 530.

A base station (for example, an access point) may refer to a device that communicates with a wireless terminal through one or more sectors on an air interface in an access network. The base station equipment can also coordinate the attribute management of the air interface. For example, the base station equipment may be an evolved base station in LTE or a base station or access point in NR, which is not limited in this application. It should be understood that the base station described in the embodiments of the present application may be not only a base station device, but also a relay device, or other network element devices with base station functions.

The donor base station can be an access network element with complete base station functions, or a form in which the CU and DU are separated, that is, the donor node is composed of a centralized unit of the donor base station and a distributed unit of the donor base station. In this article, the centralized unit of the host node is also called IAB donor CU (also called donor CU, or directly called CU). The distributed unit of the host node is also called IAB donor DU (or donor DU). Among them, the donor CU may also be a form where the control plane (CP) (referred to as CU-CP in this article) and the user plane (UP) (referred to in this article as CU-UP) are separated. For example, a CU may be composed of one CU-CP and one or more CU-UPs.

In 5G, considering the small coverage of the high frequency band, in order to ensure the coverage performance of the network, multi-hop networking may be adopted in the IAB network. Taking into account the requirements of service transmission reliability, the IAB node can be made to support dual connectivity (DC) or multi-connectivity to deal with possible abnormal situations in the backhaul link. For example, abnormalities such as link interruption or blockage and load fluctuations can improve the reliability of transmission. Therefore, the IAB network supports multi-hop networking and can also support multi-connection networking.

Link: It can represent the path between two adjacent nodes in a path.

Access link: It can indicate the link between the terminal device and the base station, or between the terminal device and the IAB node, or between the terminal device and the host node, or between the terminal device and the host DU. Or, the access link includes a wireless link used when a certain IAB node acts as a common terminal device to communicate with its parent node. When the IAB node acts as an ordinary terminal device, it does not provide backhaul services for any child nodes. The access link includes an uplink access link and a downlink access link. In this application, the access link of the terminal device is a wireless link, so the access link may also be called a wireless access link.

Backhaul link: It can represent the link between the IAB node and the parent node when it is used as a wireless backhaul node. When the IAB node is used as a wireless backhaul node, it provides wireless backhaul services for the child nodes. The backhaul link includes the uplink backhaul link and the downlink backhaul link. In this application, the backhaul link between the IAB node and the parent node is a wireless link, so the backhaul link can also be called a wireless backhaul link.

Parent node and child node: Each IAB node regards the neighboring node that provides wireless access service and/or wireless backhaul service for it as a parent node. Correspondingly, each IAB node can be regarded as a child node of its parent node.

Alternatively, the child node may also be referred to as a lower-level node, and the parent node may also be referred to as an upper-level node.

As shown in Figure 6, the parent node of IAB node 1 is IAB donor, IAB node 1 is the parent node of IAB node 2 and IAB node 3, and IAB node 2 and IAB node 3 are both the parent nodes of IAB node 4, and IAB node 5 The parent node is IAB node 3. The uplink data packet of the UE may be transmitted to the host site IAB donor via one or more IAB nodes, and then sent by the IAB donor to the mobile gateway device (for example, the user plane function unit UPF in the 5G core network). The UE's downlink data packet will be received by the IAB donor from the mobile gateway device, and then sent to the UE through the IAB node. Among them, there are two available paths for data transmission between UE1 and the donor base station. Path 1: Terminal 1→IAB node 4→IAB node 3→IAB node 1→host node, and terminal 1→IAB node 4→IAB node 2→IAB node 1→host node. There are three available paths for data packet transmission between terminal 2 and host node, namely: terminal 2→IAB node 4→IAB node 3→IAB node 1→host node, terminal 2→IAB node 4→IAB node 2→IAB Node 1 → host node, and terminal 2 → IAB node 5 → IAB node 2 → IAB node 1 → host node.

It should be understood that the IAB networking scenario shown in Figure 6 is only exemplary. In the IAB scenario where multi-hop and multi-connection are combined, there are more other possibilities, for example, the IAB donor in Figure 6 and another The IAB node under the IAB donor forms a dual connection to serve terminal equipment, etc., which are not listed here.

The network equipment involved in the embodiments of this application includes but is not limited to: evolved node B (evolved node base, eNB), radio network controller (RNC), node B (node B, NB), base station Controller (base station controller, BSC), base transceiver station (base transceiver station, BTS), home base station (home evolved NodeB, or home node B, HNB), baseband unit (baseband Unit, BBU), evolved (evolved LTE) , eLTE) base station, base station in RAN (such as NR base station (next generation node B, gNB)), etc.

The base station may have a centralized unit (centralized unit, CU) and distributed unit (distributed unit, DU) separated architecture. The RAN can be connected to a core network (for example, it can be an LTE core network, or a 5G core network, etc.). CU and DU can be understood as the division of base stations from the perspective of logical functions. CU and DU can be physically separated or deployed together.

As shown in Figure 7, multiple DUs can share one CU. One DU can also be connected to multiple CUs (not shown in the figure). The CU and the DU can be connected through an interface, for example, an F1 interface.

CU and DU can be divided according to the protocol layer of the wireless network.

For example, one possible division method is: CU is used to implement the radio resource control (radio resource control, RRC) layer, the service data adaptation protocol (service data adaptation protocol, SDAP) layer, and the packet data convergence layer protocol (packet data convergence) layer. Protocol, PDCP) layer functions. The DU is used to perform functions such as the radio link control (RLC) layer, the media access control (MAC) layer, and the physical layer.

It can be understood that the division of CU and DU processing functions according to this protocol layer is only an example, and the division may also be performed in other ways, and the embodiment of the present application does not limit it. For example, the CU or DU can be divided into functions with more protocol layers. For another example, the CU or DU can also be divided into part of the processing functions of the protocol layer. In a design, part of the functions of the RLC layer and the functions of the protocol layer above the RLC layer are set in the CU, and the remaining functions of the RLC layer and the functions of the protocol layer below the RLC layer are set in the DU. In another design, the functions of the CU or DU can also be divided according to service types or other system requirements. For example, it is divided by time delay, and the functions whose processing time needs to meet the delay requirement are set in the DU, and the functions that do not need to meet the delay requirement are set in the CU. In another design, the CU may also have one or more functions of the core network. One or more CUs can be set centrally or separately. For example, the CU can be set on the network side to facilitate centralized management. The DU can have multiple radio frequency functions, or the radio frequency functions can be set remotely.

The functions of the CU can be implemented by one entity or by different entities. For example, the functions of the CU can be further divided, for example, the control panel (CP) and the user panel (UP) are separated, that is, the control plane (CU-CP) of the CU and the user plane (CU) are separated. -UP). For example, the CU-CP and CU-UP may be implemented by different functional entities, and the CU-CP and CU-UP may be coupled with the DU to jointly complete the function of the base station.

The foregoing exemplarily shows several possible scenarios applicable to the embodiments of the present application in conjunction with FIG. 1 to FIG. 7, and it should be understood that the present application is not limited thereto.

As mentioned earlier, in the 3rd generation partnership project (3rd generation partnership project, 3GPP) agreement on the discussion of 5G systems, satellites will be used as a new access method. In satellite communications, cell selection/reselection is based on the cell selection/reselection mechanism of the terrestrial network (TN).

To facilitate understanding, first briefly introduce the cell selection/reselection of the terrestrial network.

1. Community selection

When a terminal device is turned on or a radio link failure occurs, the terminal device will perform a cell search process and select a suitable cell to camp on as soon as possible. This process is called "cell selection".

An example of a possible cell selection process is as follows:

During the cell search process, the terminal equipment will read the system information of the cell and obtain parameters such as Qrxlevmeas, Qrxlevmin and Qrxlevminoffset. The terminal equipment evaluates whether the cell is a suitable cell according to the S criterion. Once a suitable cell is found, that is, it satisfies S Standard cell, the cell selection process is completed. If the cell is not a suitable cell, the terminal device continues to search until it finds a suitable cell and camps on it.

S criterion formula: S _rxlev > 0, that is, if the S value of a cell is greater than 0, it means that the cell is a suitable cell, that is, a cell suitable for camping. The calculation formula of _{S rxlev is:}

S _rxlev =Q _rxlevmeas -(Q _rxlevmin -Q _{rxlevminoffset} )-P _compensation

among them:

S _rxlev : calculated cell selection reception level value;

Q _rxlevmeas : the received signal strength value measured by the terminal device, and the value is the measured reference signal receiving power (RSRP);

Q _rxlevmin : the minimum received signal strength value required by the cell;

P _compensation : (PEMAX-PUMAX) or the larger value of 0, where PEMAX is the maximum allowable transmission power set by the system when the terminal device accesses the cell; PUMAX refers to the maximum output power specified by the terminal device level.

Q _{rxlevminoffset} : This parameter can only be used when the terminal device normally resides in a virtual private mobile network (VPMN) and periodically searches for a high-priority public land mobile network (PLMN) for cell selection It is only valid during evaluation. This parameter _{biases Q rxlevmin} to a certain extent.

It should be noted that due to the evolution of the communication protocol version, the S criterion formula and _{the calculation formula of S rxlev} may be changed for some reasons. The formula given here is just an example and does not limit the formula itself. The embodiments of this application do not limit the parameters and criteria for cell selection.

2. Residential reselection

After the terminal device camps in a cell, as the terminal device moves, the terminal device may need to be changed to another cell with a higher priority or better signal to camp on. This is the cell reselection process. Cell selection is a process of finding a suitable cell as soon as possible, and cell reselection is a process of selecting a more suitable cell. In order to save power for terminal equipment, the agreement stipulates measurement criteria:

For the frequency layer or system that has a higher priority than the cell where it resides, the terminal equipment always measures it;

If S _{rxlev of the} camped cell <= S _intrasearch , the terminal device starts the measurement of the same frequency cell, where S _intrasearch is the same frequency measurement threshold;

If S _rxlev <= S _{nonintrasearch} or S _{nonintrasearch of the camping cell is} not configured, the terminal device starts the measurement of the same priority frequency or low priority frequency and system;

After the measurement, the terminal equipment will determine whether to perform cell reselection to a new cell. The reselection criteria are as follows:

High priority frequency or system reselection standard: S _rxlev > _{Threshx-high of the} target frequency cell, and lasts for a certain period of time, where _Threshx-high refers to the reselection from the current service carrier frequency to the higher priority frequency Time threshold;

Low priority frequency or system reselection standard: S _rxlev <T _{hreshserving-low of the} resident cell, and lasts for a certain period of time, where _Threshx-low refers to the reselection from the current service carrier frequency to the frequency with lower priority Time threshold;

Reselection criteria of the same priority frequency or system: the reselection of the cell to the same priority frequency is based on the ranking standard of the same frequency cell reselection. The ranking criteria for co-frequency cell reselection are defined as follows, R _s is the ranking value of the current camping cell, and R _n is the ranking value of the neighboring cell:

_{_{_{R s = Q meas_s + Q hyst}}} -Q offset_temp, R n = Q meas_s -Q offset -Q offset_temp

among them:

Q _hyst : Hysteresis value, used to prevent ping-pong reselection;

Q _{meas_s} : the received signal strength value of the camping cell measured by the terminal equipment;

Q _offset : For the same frequency, when Q _{offsets_n is} valid, the value is Q _{offsets_n} , otherwise the value is 0; for different frequencies, when Q _{offsets_n is} valid, the value is Q _{offsets_n} + Q _{offsetfrequency} , otherwise the value is Q _{offsetfrequency} ,;

Q _{offset_temp} : can indicate the amount of offset. The deviation amount may be, for example, a deviation amount added to a cell after a terminal device fails to establish an RRC connection on a cell, which is broadcast by the network.

The terminal equipment will sort all the cells that meet the cell selection S criterion by the ranking value. When reselecting, it is not simply reselecting to the best ranked cell, but finding the highest ranking value during the ranking, which is within a certain range ( For example, x dB, where x is configurable), the cells are considered to be similar cells. In these similar cells, the terminal device reselects to the cell with the largest number of good beams.

Generally, the system message of the currently camped cell will broadcast the required configuration parameters of the current camped cell and neighboring cells, so that the terminal device can calculate parameters such as _{R s} and R _n. Q _meas is the received signal strength value of the cell measured by the terminal device. At most N beams where the signal strength of each cell is higher than the threshold can be used to generate the cell quality, which is filtered by layer 3 as Q _meas . Wherein, the threshold and N are notified to the terminal equipment in the broadcast message, and N is an integer greater than or equal to 1. Among them, beams above the threshold are considered good beams.

It should be noted that due to the evolution of the communication protocol version, _{the calculation formulas of R s} and R _n may be changed for some reasons. The formulas given here are just examples and do not limit the formula itself. The embodiments of this application do not limit the parameters and criteria for cell reselection.

In satellite communication, cell selection/reselection is based on the cell selection/reselection mechanism of the ground network, and some characteristics of satellite communication are not considered, which may cause waste of resources and increase energy consumption.

In view of this, this application proposes a method for optimizing the cell selection/reselection mechanism in the satellite communication scenario, so that the neighboring cells to be measured can be effectively obtained, the signaling overhead is saved, and the terminal device saves power.

The various embodiments provided in the present application will be described in detail below with reference to the accompanying drawings.

FIG. 8 is a schematic interaction diagram of a communication method 800 provided by an embodiment of the present application. The method 800 may include the following steps.

810. The terminal device receives time information corresponding to at least one frequency point on the satellite ephemeris of the satellite.

The satellite can be made of LEO. Alternatively, the satellite can also be composed of GEO and LEO, that is, the terminal device can communicate with the satellite network composed of GEO and LEO; or the satellite can also be composed of multiple satellite networks composed of LEO and MEO, that is, The terminal equipment can communicate with the satellite network formed by LEO and MEO. There is no restriction on this.

Based on the satellite ephemeris (ephemeris information), the satellite's trajectory and time information can be calculated.

The satellite ephemeris can be pre-saved, that is, when the terminal device needs to use the satellite ephemeris, it can directly read the pre-saved or pre-obtained satellite ephemeris. Alternatively, the satellite ephemeris can also be sent by the network device to the terminal device.

Optionally, the terminal device receives the satellite ephemeris, and the satellite ephemeris is used to indicate information about the orbit of the satellite.

The satellite ephemeris of the satellite is fixed for a period of time, and the running direction is also fixed, so the satellite ephemeris can be notified to the terminal equipment. According to the satellite ephemeris, the terminal equipment can determine the satellite speed, moving direction, trajectory and other information.

In satellite communications, such as in the LEO scenario, the moving speed of the satellite is very fast, and the moving speed of the terminal equipment is smaller than that of the satellite. Therefore, when the terminal device determines which neighboring cells to measure, it can mainly consider the moving direction of the satellite, that is, the terminal device can selectively perform neighboring cell measurement.

Figure 9 shows a schematic diagram of a frequency point distribution. Suppose the frequency distribution is shown in Figure 9.

The direction of the satellite is from east to west, as shown in Figure 9.

Assume that the terminal device is located in a cell under frequency point 7, that is, the current serving cell of the terminal device is a cell under frequency point 7. The inter-frequency frequency points for the cell reselection of the terminal equipment include: frequency point 1, frequency point 2, frequency point 3, frequency point 4, frequency point 5, and frequency point 6. Assume that the running direction of the terminal device is shown in Figure 9.

Combining the distribution of various frequency points and the direction of satellite operation, it can be known that the different frequencies on the operating trajectory of the terminal equipment may include: frequency point 3, frequency point 4, and frequency point 5.

Therefore, when the terminal device is in the cell under frequency 7, the terminal device can only measure the cell under frequency 3, the cell under frequency 4, and the cell under frequency 5.

It should be understood that the frequency point distribution shown in FIG. 9 is only an example, and the present application is not limited to this.

For example, the time information corresponding to at least one frequency point may be included in an RRC release message (for example, when a terminal device enters an idle or inactive state from a connected state) or a broadcast message . That is, a network device (such as a serving cell) can send time information corresponding to at least one frequency point to a terminal device through an RRC release message or a broadcast message.

In this embodiment of the application, the serving cell is a satellite cell. Satellite cell refers to the cell deployed in the satellite network, or in other words, the cell located in the satellite communication system. By way of example, the satellite may consist of LEO. Alternatively, the satellite may also be composed of GEO and LEO, or a multiple satellite network composed of LEO and MEO, which is not limited.

The serving cell is a satellite cell, which means that the terminal device communicates with the satellite, or in other words, the terminal device connects to the satellite communication network to communicate.

Optionally, the time information corresponding to the at least one frequency point may be time information at which the terminal device measures the at least one frequency point. For example, the terminal equipment measures the time information of each frequency point. Or it can also be understood as the neighbor cell information that the terminal device needs to measure when it is in different serving cells.

The time information corresponding to at least one frequency point is described in detail below.

820. According to the first moment and the time information corresponding to the at least one frequency point, the terminal device determines at least one frequency point corresponding to the satellite.

The frequency point corresponding to the satellite may indicate the frequency point on the satellite ephemeris of the satellite, or the frequency point distributed or deployed in the satellite network, or the frequency point distributed or deployed under the satellite. The following is concise, expressed in frequency points.

For example, the first moment may be any moment, for example, the first moment may be the current moment. For example, according to the first moment and the time information corresponding to the at least one frequency point, the terminal device may determine the at least one frequency point that needs to be measured at the first moment.

Each frequency point may include one or more cells. Determining the frequency point can also be understood as determining at least one cell under the frequency point. Measuring the frequency point can be understood as measuring at least one cell under the frequency point.

For example, the terminal device can determine the frequency points that need to be measured at the first time and/or the frequency points that need to be measured after the first time according to the first time and the time information corresponding to at least one frequency point. Correspondingly, the terminal device can measure the frequency point corresponding to the first moment at the first moment.

For example, the terminal device can determine the frequency points that need to be measured at the current time according to the current time and the time information corresponding to at least one frequency point. For another example, the terminal device can also determine the frequency points that need to be measured after the current time based on the current time and the time information corresponding to at least one frequency point.

It should be understood that the terminal device determines the frequency point that needs to be measured at the current moment, and it does not limit the terminal device to only measure the frequency point at the current moment. The time when the terminal device actually measures the frequency point may be within a period of time adjacent to the current moment.

For example, the time information may be a specific time period, or it may be a specific time, or it may also be the start time and duration, or it may be the end time and duration. The time period is taken as an example below for exemplification.

The orbit of the satellite has a certain law, and the frequency point distribution on the satellite ephemeris also has a certain law. Therefore, the frequency point can correspond to the time.

As shown in FIG. 9, it is assumed that at the first moment, the terminal device is in a cell under frequency point 7. Then, according to the satellite's operating direction and the distribution of frequency points, it can be determined that frequency point 3, frequency point 4, and frequency point 5 correspond to a certain period of time after the first moment. That is to say, in this time period, the terminal equipment measures frequency point 3, frequency point 4, and frequency point 5.

Wherein, frequency point 3, frequency point 4, and frequency point 5 correspond to the length of the time period after the first moment, for example, it can be determined according to the operating speed of the satellite, which is not limited in the embodiment of the present application.

For example, the correspondence between frequency and time can be understood as the correspondence between the frequency and the time when the terminal device measures the frequency, or in other words, the correspondence between time and one or more frequency points. For example, frequency point 1 corresponds to the first time, and frequency point 2 corresponds to the second time. Then the terminal device measures frequency point 1 at the first time, and measures frequency point 2 at the second time.

The time information corresponding to at least one frequency point, or in other words, the time information of at least one frequency point, can be understood as the neighbor cell information required for cell reselection acquired by the terminal device in the serving cell, not only includes the information required by the terminal device in the serving cell The neighboring cell to be measured also includes the neighboring cell that needs to be measured after the terminal device reselects to another cell. Alternatively, the time information corresponding to at least one frequency point can also be understood as the neighboring cell information required for cell reselection acquired by the terminal device in the serving cell, including not only the neighboring cell that the terminal device needs to measure at the current moment, but also the terminal device Neighbor cell information that needs to be measured after the current time.

The network device (such as the serving cell of the terminal device) can notify the terminal device of the time information corresponding to at least one frequency point. For example, the network device can broadcast the time information corresponding to at least one frequency point. The time information corresponding to at least one frequency point notified by the network device may be valid in an area specific. That is, each cell in the area broadcasts the time information corresponding to the at least one frequency point. When the terminal device moves out of the area, the time information corresponding to at least one frequency point can be obtained from the broadcast message again.

For a terminal device in an idle state or a deactivated state, the time information corresponding to at least one frequency point required for cell reselection can be obtained from the serving cell (or camping cell). For example, for a terminal device in an idle state or a deactivated state, the time information corresponding to at least one frequency point required for cell reselection can be obtained through a broadcast message or an RRC message of the serving cell (or camping cell).

Optionally, the time information corresponding to at least one frequency point may be expressed in any of the following forms.

Form 1. The time information corresponding to at least one frequency point includes: the time period corresponding to each frequency point in the at least one frequency point.

For example, the terminal device can determine the time to measure each frequency point according to the time information corresponding to each frequency point.

For example, the terminal device determines the frequency point that needs to be measured at the current time according to the current time and one or more frequency points corresponding to the time period in which the current time is located.

It can be understood that the frequency points of the serving cell of the terminal device in different time periods may be different. For example, the terminal device determines the frequency point that needs to be measured at the current moment according to the current moment and one or more frequency points corresponding to the time period of the current moment. It can also be understood that the terminal device according to the current moment and the time at the current moment One or more frequency points corresponding to the segment determine the frequency points that the terminal device needs to measure in the current serving cell.

Form 2. The time information corresponding to at least one frequency point includes the time period corresponding to each group of frequency points in the N groups of frequency points.

Wherein, at least one frequency point includes N groups of frequency points, the N groups of frequency points include at least one frequency point corresponding to a satellite, and N is an integer greater than or equal to 1.

For example, the terminal device can determine the time for measuring each group of frequency points according to the time information corresponding to each group of frequency points.

For example, the terminal device determines the frequency points that need to be measured at the current time according to the current time and one or more sets of frequency points corresponding to the time period in which the current time is located.

It can be understood that the frequency points of the serving cell of the terminal device in different time periods may be different. For example, the terminal device determines the frequency points that need to be measured at the current time according to the current time and one or more sets of frequency points corresponding to the time period in which the current time is located. It can also be understood that the terminal device determines one or more sets of frequency points that the terminal device needs to measure in the current serving cell according to the current time and one or more frequency points corresponding to the time period in which the current time is located.

It should be understood that the time information corresponding to at least one frequency point may be sent by a network device (such as a serving cell) to a terminal device, or may be predetermined, such as a protocol or a network device. For example, the corresponding relationship between frequency points and time can be saved in advance, and the terminal device can read the corresponding relationship as needed.

The following is an example description with reference to Figure 10.

Figure 10 shows a schematic diagram of a frequency point distribution. Suppose the frequency distribution is shown in Figure 10. The direction of the satellite is from east to west, as shown in Figure 10.

Assume that at the first moment, the serving cell of the terminal device is the cell of frequency 2, and the terminal device requests the serving cell to broadcast neighbor cell information required for cell reselection.

For example, the terminal device requests system information (SI) from the serving cell, which can be used to request to determine whether it can continue to camp in the serving cell or whether it needs to be reselected to another cell. The serving cell can send a response message to the terminal device, for example, it can be included in a broadcast message or an RRC message. Taking a broadcast message as an example, the broadcast message may include time information corresponding to at least one frequency point. The broadcast message may also include parameters for the current serving cell, such as parameters used in the cell selection or cell reselection process, to determine whether to choose to camp on the serving cell. Alternatively, the broadcast message may also include neighboring cell information, such as parameters for neighboring cells, such as parameters used in the cell selection or cell reselection process, to determine whether to reselect the neighboring cells. Regarding the parameters that may be used in the cell selection or cell reselection process, the embodiment of the present application does not limit this. The time information corresponding to at least one frequency point is described in detail below. Among them, the terminal device may request a broadcast message through a special request message, may also request a broadcast message by sending a preamble, or may request a corresponding broadcast message through a preamble and time-frequency resources. The embodiment of the present application does not limit the manner in which the terminal device requests the serving cell to broadcast the neighbor cell information required for cell reselection.

Example 1. Take form 1 as an example. The time information corresponding to at least one frequency point, that is, the neighboring cell information broadcast by the serving cell to the terminal device, may include: frequency point 1, frequency point 7, and frequency point 3 corresponding to the first time period, frequency point 1, frequency point 3, Frequency point 4, frequency point 5, and frequency point 6 correspond to the second time period, and frequency point 1, frequency point 2, frequency point 3, and frequency point 6 correspond to the third time period.

Wherein, the start time of the first time period is before the start time of the second time period, and the start time of the second time period is before the start time of the third time period.

Among them, the first time period, the second time period, and the third time period may be determined according to the satellite's orbit, moving speed, etc., which are not limited.

Among them, frequency point 1, frequency point 7, and frequency point 3 correspond to the first time period, which means that frequency point 1, frequency point 7, and frequency point 3 are measured in the first time period. Frequency point 1, frequency point 3, frequency point 4, frequency point 5, and frequency point 6 correspond to the second time period, which means that frequency point 1, frequency point 3, frequency point 4, frequency point 5, and frequency point are measured in the second time period. Frequency point 6. Frequency point 1, frequency point 2, frequency point 3, and frequency point 6 correspond to the third time period, which means that frequency point 1, frequency point 2, frequency point 3, and frequency point 6 are measured in the third time period.

It can be understood that when the current time is in the first time period, the frequency points determined by the terminal device include: frequency point 1, frequency point 7, and frequency point 3. That is to say, the frequency points that the terminal device determines that the current time needs to be measured include: Point 1, frequency point 7, and frequency point 3. When the current time is in the second time period, the frequency points determined by the terminal equipment include: frequency point 1, frequency point 3, frequency point 4, frequency point 5, and frequency point 6, that is, the terminal equipment determines that the current time needs to be measured Frequency points include: frequency point 1, frequency point 3, frequency point 4, frequency point 5, and frequency point 6. When the current time is in the third time period, the frequency points determined by the terminal equipment include: frequency point 1, frequency point 2, frequency point 3, and frequency point 6, that is to say, the frequency points that the terminal device determines that the current time needs to be measured include: Frequency point 1, frequency point 2, frequency point 3, and frequency point 6.

For example, in the above example 1, when the serving cell of the terminal device is the cell of frequency point 2, with the operation of the satellite, in the first time period, the frequency points on the running track of the terminal equipment may include: frequency point 1, frequency point 7. And frequency point 3. In this case, it can be considered that frequency point 2 is associated with frequency point 1, frequency point 7, and frequency point 3. That is, in the first time period, the terminal device measures the frequency points associated with frequency point 2: frequency point 1, frequency point 7, and frequency point 3.

For another example, in the above example 1, with the operation of the satellite, the serving cell of the terminal device may change from the cell of frequency 2 to the cell of frequency 7. When the serving cell of the terminal equipment is the cell of frequency point 7, with the operation of the satellite, in the second time period, the frequency points on the running track of the terminal equipment may include: frequency point 1, frequency point 3, frequency point 4, frequency point 5. And frequency point 6. In this case, it can be considered that frequency point 7 is associated with frequency point 1, frequency point 3, frequency point 4, frequency point 5, and frequency point 6. That is, in the second time period, the terminal device measures frequency point 1, frequency point 3, frequency point 4, frequency point 5, and frequency point 6.

For another example, in the above example 1, with the operation of the satellite, the serving cell of the terminal device may change from a cell at frequency 7 to a cell at frequency 5. When the serving cell of the terminal device is the cell of frequency point 5, with the operation of the satellite, in the second time period, the frequency points on the running track of the terminal equipment may include: frequency point 1, frequency point 2, frequency point 3, and frequency point Point 6. In this case, it can be considered that frequency point 5 is associated with frequency point 1, frequency point 2, frequency point 3, and frequency point 6. That is to say, in the third time period, the terminal equipment measures frequency point 1, frequency point 2, frequency point 3, and frequency point 6.

Example 2. Take form 2 as an example. The time information corresponding to at least one frequency point, that is, the neighboring cell information broadcast by the serving cell to the terminal device, may include: the first group of frequency points corresponds to the first time period, the second group of frequency points corresponds to the second time period, and the third group The frequency point corresponds to the third time period.

Among them, the first group of frequency points includes: frequency point 1, frequency point 7, and frequency point 3. The second group of frequency points includes: frequency point 1, frequency point 3, frequency point 4, frequency point 5, and frequency point 6. The third group of frequency points includes: frequency point 1, frequency point 2, frequency point 3, frequency point 6

Among them, the first group of frequency points corresponds to the first time period, which means that the first group of frequency points is measured in the first time period. The second group of frequency points corresponds to the second time period, which means that the second group of frequency points are measured in the second time period. The third group of frequency points corresponds to the third time period, which means that the third group of frequency points is measured in the third time period.

It can be understood that when the current time is in the first time period, the frequency points determined by the terminal device include: the first group of frequency points, that is, the frequency points that the terminal device determines to be measured at the current time include: the first group of frequency points. When the current time is in the second time period, the frequency points determined by the terminal device include: the second group of frequency points, that is, the frequency points that the terminal device determines to be measured at the current time include: the second group of frequency points. When the current time is in the third time period, the frequency points determined by the terminal device include: the third group of frequency points, that is, the frequency points that the terminal device determines to be measured at the current time include: the third group of frequency points.

For example, in the above example 2, when the serving cell of the terminal device is the cell of frequency 2, with the operation of the satellite, in the first time period, the frequency points on the running track of the terminal device may include: the first group of frequency points. In this case, it can be considered that frequency point 2 is associated with the first group of frequency points. That is, in the first time period, the terminal device measures the frequency points associated with frequency point 2: the first group of frequency points.

For another example, in the above example 2, with the operation of the satellite, the serving cell of the terminal device may change from the cell of frequency point 2 to the cell of frequency point 7. When the serving cell of the terminal device is the cell of frequency point 7, with the operation of the satellite, in the second time period, the frequency points on the operation trajectory of the terminal device may include: a second set of frequency points. In this case, it can be considered that frequency point 7 is associated with the second group of frequency points. That is, in the second time period, the terminal device measures the frequency points associated with frequency point 7: the second group of frequency points.

For another example, in the above example 2, with the operation of the satellite, the serving cell of the terminal device may change from a cell at frequency 7 to a cell at frequency 5. When the serving cell of the terminal device is the cell of frequency point 5, with the operation of the satellite, in the second time period, the frequency points on the running track of the terminal device may include: the third group of frequency points. In this case, it can be considered that frequency point 5 is associated with the third group of frequency points. That is, in the third time period, the terminal device measures the third group of frequency points.

It should be understood that the foregoing example 1 or example 2 is only an exemplary description, and the embodiment of the present application is not limited thereto. For example, the neighboring cell information broadcast by the serving cell to the terminal device may include at least one layer of frequency point information. Each layer of frequency points includes one or more frequency points. It can be assumed that each layer of frequency points can correspond to a time period. For example, the time period corresponding to the first layer frequency point is before the time period corresponding to the second layer frequency point, the time period corresponding to the second layer frequency point is before the time period corresponding to the third layer frequency point, and so on.

As an example, suppose that the time period closest to the current moment is the time period corresponding to the first layer frequency point. After receiving the neighbor cell information broadcast by the serving cell, the terminal device first measures the first layer frequency point at a certain time (such as the first time period). After the service cell of the terminal device changes, at a certain time (such as the second time period), measure the second layer frequency point, and so on.

In another example, the neighboring cell information broadcast by the serving cell to the terminal device may also include a time period corresponding to any frequency point of the layer. After receiving the neighbor cell information broadcast by the serving cell, the terminal device determines the frequency point corresponding to the time period close to the current time according to the time interval between the current time and the time period corresponding to any layer frequency point received. For example, the neighboring cell information broadcast by the serving cell to the terminal device may also include the time period corresponding to the first layer frequency point. After receiving the neighbor cell information broadcast by the serving cell, the terminal device determines that the current time may be within the time period corresponding to the second layer frequency point according to the time interval between the current time and the time period corresponding to the first layer frequency point, so the terminal The device determines that the frequency point to be measured at the current moment is the second layer frequency point. After the serving cell of the terminal device changes, at a certain time (such as the third time period), the terminal device measures the third layer frequency point, and so on.

It can be seen from the above example 1 or example 2 that based on the embodiment of the present application, when the serving cell of the terminal device is the cell of frequency point 2, the neighboring cell information obtained by the terminal device not only includes the neighboring cell information of the cell of frequency point 2. The neighboring cell information of the cell at frequency point 7 and the neighboring cell information of the cell at frequency point 5 may also be included. This can prevent the terminal device from requesting system information (SI) multiple times. For example, when the serving cell of the terminal device is the cell of frequency point 2, the terminal device requests to broadcast the neighboring cell information of the cell of frequency point 2; the serving cell of the terminal device When it is the cell of frequency point 7, the terminal device requests to broadcast the neighboring cell information of the cell of frequency point 7. Further, the signaling overhead can also be saved.

It should be understood that, in the foregoing example 1 or example 2, the frequency points corresponding to the second time period and the third time period included in the time information corresponding to at least one frequency point are only an exemplary description, and the embodiment of the present application does not Limited to this.

Regarding the frequency points corresponding to the second time period and the third time period, Example 1 and Example 2 only show one possible situation. The frequency points corresponding to the second time period and the third time period may also include other situations.

Take the frequency point corresponding to the second time period as an example.

When the serving cell of the terminal device is the cell of frequency point 2, with the operation of the satellite, in the first time period, the frequency points on the running track of the terminal device may include: frequency point 1, frequency point 7, and frequency point 3. Then, the serving cell of the terminal device may change from the cell of frequency 2 to the cell of frequency 1, the serving cell of the terminal device may also change from the cell of frequency 2 to the cell of frequency 7, and the serving cell of the terminal device may also be Change from the cell of frequency 2 to the cell of frequency 3.

Therefore, the frequency points corresponding to the second time period may include one or more of the following: frequency points associated with frequency point 1, frequency points associated with frequency point 7, and frequency points associated with frequency point 3.

The frequency point associated with frequency point 1, that is, when the serving cell of the terminal device is the cell of frequency point 1, as the satellite runs, the frequency point that may be included in the running track of the terminal device. Taking the frequency point distribution shown in FIG. 10 as an example, the frequency points associated with frequency point 1 may include: frequency point 6, frequency point 5, and frequency point 4.

The frequency point associated with frequency point 7 refers to the frequency points that may be included in the operation trajectory of the terminal equipment when the serving cell of the terminal device is the cell of frequency point 7, with the operation of the satellite. Taking the frequency point distribution shown in FIG. 10 as an example, the frequency points associated with frequency point 7 may include: frequency point 1, frequency point 3, frequency point 4, frequency point 5, and frequency point 6.

The frequency point associated with frequency point 3, that is, when the serving cell of the terminal equipment is the cell of frequency point 3, as the satellite runs, the frequency points that may be included in the running track of the terminal equipment. Taking the frequency point distribution shown in FIG. 10 as an example, the frequency points associated with frequency point 3 may include: frequency point 7, frequency point 4, frequency point 5, and frequency point 6.

Optionally, the frequency points corresponding to the second time period may include: frequency points that have an association relationship with all or part of the frequency points corresponding to the first time period. Described below separately.

In case 1, the frequency points corresponding to the second time period may include: frequency points that have an association relationship with all frequency points corresponding to the first time period.

That is, the frequency points corresponding to the second time period include: frequency points associated with frequency point 1, frequency points associated with frequency point 7, and frequency points associated with frequency point 3. That is, the frequency points corresponding to the second time period may include: frequency point 6, frequency point 5, frequency point 4, frequency point 1, frequency point 3, and frequency point 7.

In case 2, the frequency points corresponding to the second time period may include: frequency points that have an association relationship with part of the frequency points corresponding to the first time period.

For example, the frequency point corresponding to the second time period may include: a frequency point associated with frequency point 1. That is, the frequency points corresponding to the second time period may include: frequency point 6, frequency point 5, and frequency point 4.

For another example, the frequency point corresponding to the second time period may include: a frequency point associated with frequency point 7. That is, the frequency points corresponding to the second time period may include: frequency point 1, frequency point 3, frequency point 4, frequency point 5, and frequency point 6.

For another example, the frequency point corresponding to the second time period may include: a frequency point associated with frequency point 3. That is, the frequency points corresponding to the second time period may include: frequency point 7, frequency point 4, frequency point 5, and frequency point 6.

For another example, the frequency points corresponding to the second time period may include: frequency points associated with frequency point 1 and frequency points associated with frequency point 7. That is, the frequency points corresponding to the second time period may include: frequency point 1, frequency point 3, frequency point 4, frequency point 5, and frequency point 6.

For another example, the frequency points corresponding to the second time period include: frequency points associated with frequency point 1 and frequency points associated with frequency point 3. That is, the frequency points corresponding to the second time period may include: frequency point 7, frequency point 4, frequency point 5, and frequency point 6.

For another example, the frequency points corresponding to the second time period may include: frequency points associated with frequency point 7 and frequency points associated with frequency point 3. That is, the frequency points corresponding to the second time period may include: frequency point 6, frequency point 5, frequency point 4, frequency point 1, frequency point 3, and frequency point 7.

For another example, the frequency points corresponding to the second time period may include any one or more of the following: part of frequency points associated with frequency point 1, part of frequency points associated with frequency point 7, and part of frequency points associated with frequency point 3. .

For another example, the frequency point corresponding to the second time period may include: a frequency point associated with a certain frequency point corresponding to the first time period, and the certain frequency point is: a frequency point associated with the frequency point corresponding to the first time period The frequency point with the most frequency points. For example, the certain frequency point is frequency point 7, that is, the frequency point corresponding to the second time period may include the frequency point associated with frequency point 7.

It should be understood that the foregoing is only an exemplary description, and any modifications that fall into the foregoing two situations fall within the protection scope of the embodiments of the present application.

It should also be understood that the above description takes the frequency point corresponding to the second time period as an example, and the method of determining the frequency point corresponding to the third time period is similar to the method of determining the frequency point corresponding to the second time period, and will not be repeated here. .

It should also be understood that the duration of the first time period, the second time period, and the third time period may be determined according to the satellite's operating direction, moving speed, etc., which is not limited. For example, more time periods can also be included.

For example, at least one frequency point can also be understood as at least one layer of neighboring cells.

Take frequency point 1, frequency point 3, frequency point 4, frequency point 5, and frequency point 6 corresponding to the second time period, and frequency point 1, frequency point 2, frequency point 3, and frequency point 6 corresponding to the third time period as an example . The first layer of neighboring cells may include: frequency 1 cell, frequency 7 cell, and frequency 3 cell. The second layer of neighboring cells may include: frequency 1 cell, frequency 3 cell, frequency 4 cell, frequency 5 cell, and frequency 6 cell. The third layer of neighboring cells may include: frequency 1 cell, frequency 2 cell, frequency 3 cell, and frequency 6 cell.

The time information of at least one frequency point can also be understood as the information of at least one layer of neighboring cells. For example, the information of at least one layer of neighboring cells may include:

The time information corresponding to the neighboring area of the first layer is the first time period, that is, the neighboring area of the first layer is measured in the first time period;

The time information corresponding to the second-level neighboring area is the second time period, that is, the second-level neighboring area is measured in the first time period;

The time information corresponding to the third-level neighboring area is the third time period, that is, the third-level neighboring area is measured in the third time period.

In the embodiment of the present application, each cell of the terminal device under the satellite can broadcast the time information corresponding to at least one frequency point (or the information of at least one layer of neighboring cells) as described above. That is to say, for the terminal equipment in the idle state or in the deactivated state, the information of at least one layer of neighboring cells required for cell reselection is obtained. For example, the terminal device can obtain the information of at least one layer of neighboring cells required for cell reselection through the broadcast message or the RRC message of the serving cell (or the camping cell).

Based on the above technical solution, considering that in the satellite communication scenario, the satellite ephemeris, moving speed, etc. are known to the satellite, therefore, the network equipment (such as the serving cell of the terminal equipment) can notify the terminal equipment that at least one frequency point corresponds Time information (or at least one layer of neighboring cell information), for example, a network device (such as a serving cell of a terminal device) can broadcast time information corresponding to at least one frequency point. For a terminal device in an idle state or a deactivated state, time information corresponding to at least one frequency point required for cell reselection can be obtained. For example, the terminal device may obtain the time information corresponding to at least one frequency point required for cell reselection by reading the broadcast message or the RRC message of the serving cell. In other words, the terminal device can not only obtain the information of the current neighboring cell, but also the information of the "neighbor cell of the neighboring cell" (that is, the neighboring cell that the terminal device needs to measure in other serving cells), which can further reduce the number of terminal devices. The signaling overhead caused by the system message of the second request helps the terminal equipment to save power.

For ease of understanding, FIG. 11 shows a specific process. The method 1100 shown in FIG. 11 may include the following steps.

1110. The network device sends time information corresponding to at least one frequency point through an RRC release message or a broadcast message.

For example, the network device may send time information corresponding to at least one frequency point to the terminal device through the serving cell. The service cell is a satellite cell.

For the introduction of satellite cells and satellites, reference may be made to the description in the previous method 800.

For ease of description, FIG. 11 takes the interaction between the serving cell and the terminal device as an example for description.

Optionally, the serving cell can also send satellite ephemeris to the terminal device.

According to the satellite ephemeris, the terminal equipment can obtain the satellite speed, moving direction, trajectory and other information.

Each cell under the satellite can broadcast time information corresponding to at least one frequency point (or at least one layer of neighboring cell information). Take the frequency distribution in Figure 10 as an example. The time information corresponding to the at least one frequency point may include: frequency point 1, frequency point 7, and frequency point 3 corresponding to the first time period, frequency point 1, frequency point 3, frequency point 4, frequency point 5, and frequency point 6. Corresponding to the second time period, and frequency point 1, frequency point 2, frequency point 3, and frequency point 6 correspond to the third time period.

For the frequency points corresponding to the second time period and the third time period, there may be other possible situations. For details, reference may be made to the description in the method 800.

Optionally, the at least one level of neighboring cell relationship is valid in a certain area, and when the terminal device moves out of the area, the neighboring cell relationship can be re-acquired.

For the time information corresponding to at least one frequency point, reference may be made to the description in method 800.

1120, the terminal equipment measures the neighboring area.

The terminal device determines the neighboring cell to be measured according to the current time and the time information corresponding to at least one frequency point.

For example, when the current moment is in the first time period, the neighboring cells measured by the terminal device may include: a cell at frequency 1, a cell at frequency 7, and a cell at frequency 3. For another example, when the current moment is in the second time period, the neighboring cells measured by the terminal device may include: the cell of frequency 1, the cell of frequency 3, the cell of frequency 4, the cell of frequency 5, and the cell of frequency 6. Community. For another example, when the current moment is in the third time period, the neighboring cells measured by the terminal device may include: a cell at frequency 1, a cell at frequency 2, a cell at frequency 3, and a cell at frequency 6.

Optionally, the method 1100 may further include step 1130.

1130, cell reselection.

That is, the terminal device determines whether to perform cell reselection according to the measurement result. For example, when the cell reselection criterion is met, the terminal device performs cell reselection.

It is described above in conjunction with Figures 8 to 11 that for a terminal device in an idle state or a deactivated state, the time information corresponding to at least one frequency point (that is, the information of at least one layer of neighboring cells) required for cell reselection can be obtained. Further, the signaling overhead caused by the terminal device's multiple requests for system messages can be reduced, and the terminal device can save power.

Another solution is introduced below, which can also help terminal equipment save power by reducing unnecessary measurements. This solution can be used alone or in combination with the above method 800 or method 1000.

FIG. 12 is a schematic interaction diagram of a communication method 1200 provided by an embodiment of the present application. The method 1200 may include the following steps.

1210: The terminal device measures the serving cell.

The service cell is a satellite cell. For the introduction of satellite cells and satellites, reference may be made to the description in the previous method 800.

1220: When the quality of the serving cell is less than or equal to the first threshold, the terminal device measures the neighboring cell.

The quality of the serving cell refers to the signal quality of the cell. Among them, the signal quality of the cell can be characterized in a variety of ways, which is not limited in the embodiment of the present application. For example, the signal quality of a cell can be characterized by any one or more of the following: reference signal receiving power (RSRP), reference signal receiving quality (RSRQ), signal to interference plus noise ratio ( signal to interference plus noise ratio, SINR). For example, the measurement of the signal quality of the cell may be measured by a reference signal, such as by a secondary synchronization signal (SSS) measurement.

It should be understood that any manner that can characterize the signal quality of a cell falls within the protection scope of the embodiments of the present application.

In the NTN scenario, the coverage area of a cell is very wide, especially in the GEO scenario, not only the coverage area is wide, but the cell is stationary relative to the ground. Therefore, when the quality of the serving cell is lower than or equal to a certain threshold (that is, the first threshold), the neighboring cell is measured again. In this way, unnecessary measurements can be reduced and the terminal device can save power.

For example, the first threshold may be pre-defined, such as pre-defined by a protocol or a network device; or, it may also be configured by a network device, which is not limited.

For example, a network device (such as a current serving cell) sends a broadcast message, and the broadcast message may include the first threshold.

It should be understood that the first threshold is only a naming, and does not limit the protection scope of the embodiments of the present application.

It should also be understood that, regarding the case where the quality of the serving cell is equal to the first threshold, the embodiment of the present application does not limit this. For example, when the quality of the serving cell is equal to the first threshold, the terminal device may measure the neighboring cell; or, when the quality of the serving cell is equal to the first threshold, the terminal device does not measure the neighboring cell.

After the terminal device measures the neighboring cell, it can determine whether to perform cell reselection according to the measurement result.

1230. In the case where the cell quality of the neighboring cell is greater than or equal to the second threshold, or the cell quality difference is greater than or equal to the third threshold, the terminal device performs cell reselection.

Wherein, the cell quality difference means: the difference between the cell quality of the neighboring cell and the cell quality of the serving cell.

The terminal device performs cell reselection, which can mean that the terminal device reselects the neighboring cell, or the terminal device selects the neighboring cell as the serving cell.

As shown in FIG. 13, the neighboring cell measured by the terminal device may be a cell adjacent to the current serving cell. Or, the neighboring cell measured by the terminal device is a cell that overlaps with the network coverage of the current serving cell.

In the case that the cell quality of the neighboring cell is greater than or equal to the second threshold, or the cell quality difference is greater than or equal to the third threshold, the terminal device no longer performs neighboring cell measurement, and the terminal device reselects the neighboring cell.

After the terminal device measures the neighboring cells, it may not need to measure all the neighboring cells on a frequency point. In other words, the terminal device does not need to measure all the neighboring cells and then perform sorting (for example, sorting based on the R criterion). Considering that a cell has a wide coverage area, as long as there is a suitable neighboring cell, the terminal device performs cell reselection, that is, selects the suitable cell as the serving cell. In this way, not only can communication be ensured, but also can help terminal equipment to save power.

There are many ways to determine a suitable neighborhood, two of which are briefly introduced below.

1) The quality of the neighboring cell is greater than or equal to the second threshold.

In other words, as long as the quality of the neighboring cell is greater than or equal to a certain threshold, the terminal device selects the neighboring cell as the serving cell.

For example, the second threshold may be pre-defined, such as a protocol or a network device pre-defined; or, it may also be configured by a network device, which is not limited.

For example, a network device (such as a current serving cell) sends a broadcast message, and the broadcast message may include the second threshold. The second threshold and the first threshold may be included in the same broadcast message.

For example, the second threshold may be equal to the first threshold.

It can be understood that as long as the quality of the neighboring cell is greater than the quality of the current serving cell, the terminal device performs cell reselection, that is, the terminal device selects the neighboring cell as the serving cell.

2) The cell quality difference is greater than the third threshold.

That is, as long as the quality of the neighboring cell is higher than the quality of the current serving cell by a threshold (that is, the third threshold), the terminal device selects the neighboring cell as the serving cell.

For example, the third threshold may be pre-defined, such as a protocol or a network device; or, it may also be configured by a network device, which is not limited.

For example, a network device (such as the current serving cell) sends a broadcast message, and the broadcast message may include the third threshold. The third threshold and the first threshold may be included in the same broadcast message.

It should be understood that the above 1) and 2) are only two exemplary descriptions, and the embodiments of the present application are not limited thereto.

In satellite communication, the speed of satellites is relatively fast, and the terminal device may need to perform a cell reselection in 1-2 minutes, so there is no need to measure multiple neighboring cells before each reselection, and then select the most suitable neighboring cell as the service Community. In the solution described in method 1200, for example, the terminal device measures the neighboring cell when the quality of the serving cell is less than the first threshold; for another example, when the quality of the neighboring cell is greater than or equal to the second threshold, the terminal device performs cell reconfiguration. Election; For another example, when the cell quality difference is greater than the third threshold, the terminal device performs cell reselection. The solution described in the method 1200 can be considered as a simple cell reselection mechanism, which can not only ensure communication, but also reduce unnecessary measurements and help the terminal device to save power.

Optionally, before step 1210, the method 1200 may further include step 1201.

1201. The terminal device receives the instruction information. The indication information can be used to instruct the terminal device to perform a simple cell reselection mechanism (that is, the solution described in the method 1200).

That is, the terminal device may determine according to the instruction information: when the quality of the current serving cell measured by the terminal device is less than the first threshold, the terminal device measures the neighboring cell. Alternatively, the terminal device may determine according to the instruction information: when the quality of the neighboring cell measured by the terminal device is greater than or equal to the second threshold, or when the cell quality difference is greater than the third threshold, the terminal device selects the neighboring cell as the serving cell.

It is described above in conjunction with FIG. 12 and FIG. 13 that the terminal device can perform simple cell reselection. For example, when the quality of the serving cell measured by the terminal device is less than a certain threshold, the terminal device measures the neighboring cell. For another example, as long as there is a suitable neighboring cell, the terminal device can reselect the neighboring cell, if the quality of the neighboring cell is higher than a certain threshold, or the quality of the neighboring cell is higher than the quality of the serving cell, or The quality of the neighboring cell is higher than the quality of the serving cell by a certain threshold, and so on. Furthermore, unnecessary measurements can be reduced and the terminal equipment can save power.

The various embodiments described herein may be independent solutions, or may be combined according to internal logic, and these solutions fall within the protection scope of the present application. For example, when determining when to start measuring the serving cell, or when to perform cell reselection, the solution shown in method 1200 can be referred to. For another example, when the terminal device determines which cells to measure, it can refer to the solution shown in method 800.

For example, after determining at least one frequency point corresponding to the satellite through the solution shown in method 800, measurement can be performed according to the solution shown in method 1200. For example, when the quality of the serving cell is lower than or equal to a certain threshold, measure the serving cell; when the cell quality of the neighboring cell is greater than or equal to the second threshold, or the cell quality difference is greater than or equal to the third threshold , The terminal device performs cell reselection.

It can be understood that the methods and operations implemented by the terminal device in the foregoing method embodiments can also be implemented by components (such as chips or circuits) that can be used in the terminal device. The methods and operations implemented by the network device in the foregoing method embodiments may also be implemented by a network device. Operations can also be implemented by components (such as chips or circuits) that can be used in network devices.

The method embodiments provided by the present application are described above, and the device embodiments provided by the present application will be described below. It should be understood that the description of the device embodiment and the description of the method embodiment correspond to each other. Therefore, for the content that is not described in detail, please refer to the above method embodiment. For the sake of brevity, details are not repeated here.

The foregoing describes the solutions provided in the embodiments of the present application mainly from the perspective of interaction between various network elements. It can be understood that each network element, such as a transmitting end device or a receiving end device, includes hardware structures and/or software modules corresponding to each function in order to realize the above-mentioned functions. Those skilled in the art should be aware that, in combination with the units and algorithm steps of the examples described in the embodiments disclosed herein, this application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered as going beyond the scope of protection of this application.

The embodiments of the present application can divide the transmitting end device or the receiving end device into functional modules based on the foregoing method examples. For example, each functional module can be divided corresponding to each function, or two or more functions can be integrated into one process. Module. The above-mentioned integrated modules can be implemented in the form of hardware or software function modules. It should be noted that the division of modules in the embodiments of the present application is illustrative, and is only a logical function division, and there may be other feasible division methods in actual implementation. The following is an example of dividing each function module corresponding to each function as an example.

FIG. 14 is a schematic block diagram of a communication device 1400 according to an embodiment of the application. The communication device 1400 includes a transceiver unit 1410 and a processing unit 1420. The transceiver unit 1410 can communicate with the outside, and the processing unit 1410 is used for data processing. The transceiving unit 1410 may also be referred to as a communication interface or a communication unit.

Optionally, the communication device 1400 may further include a storage unit, and the storage unit may be used to store instructions and/or data, and the processing unit 1420 may read the instructions and/or data in the storage unit.

The communication device 1400 can be used to perform the actions performed by the terminal device in the above method embodiment. At this time, the communication device 1400 can be a terminal device or a component configurable in the terminal device, and the transceiver unit 1410 is used to perform the above method. In the embodiment, the processing unit 1420 is configured to perform the processing-related operations on the terminal device side in the above method embodiments for the operations related to receiving and sending on the terminal device side.

Alternatively, the communication device 1400 may be used to perform the actions performed by the network device (such as a serving cell) in the above method embodiment. In this case, the communication device 1400 may be a network device or a component that can be configured in a network device, and a transceiver unit 1410 is used to perform operations related to receiving and sending on the network device side in the above method embodiment, and the processing unit 1420 is used to perform processing related operations on the network device side in the above method embodiment.

As a design, the communication device 1400 is used to perform the actions performed by the terminal device in the embodiment shown in FIG. 8 above, and the transceiver unit 1410 is used to: receive time information corresponding to at least one frequency point on the satellite ephemeris of the satellite The processing unit 1420 is configured to: determine at least one frequency point corresponding to the satellite according to the first moment and the time information corresponding to the at least one frequency point.

Optionally, the transceiver unit 1410 is further configured to: receive satellite ephemeris, which is used to indicate the information of the satellite's orbit; the processing unit 1420 is specifically configured to: according to the satellite ephemeris, the first moment, and at least one frequency point corresponding Time information, at least one frequency point corresponding to the satellite is determined.

Optionally, the time information corresponding to at least one frequency point includes: the time period corresponding to each frequency point in at least one frequency point, or the time period corresponding to each group of frequency points in the N groups of frequency points; wherein, at least one frequency point The points include N groups of frequency points, the N groups of frequency points include at least one frequency point corresponding to the satellite, and N is an integer greater than or equal to 1.

Optionally, the time information corresponding to the at least one frequency point includes: information about measuring the time of each frequency point in the at least one frequency point.

Optionally, the at least one frequency point corresponding to the satellite includes: one or more frequency points corresponding to the first moment, and/or, M groups of frequency points corresponding to M time periods after the first moment, of which, M Each time period in the time period corresponds to a set of frequency points, and M is an integer greater than or equal to 1.

Optionally, the processing unit 1420 is further configured to: measure the frequency point corresponding to the first moment; and/or, measure the frequency point corresponding to each time period in each of the M time periods.

Optionally, the M time periods include a first time period and a second time period, the first time period is before the second time period; the frequency points corresponding to the second time period include: all frequency points corresponding to the first time period Or some frequency points have an association relationship.

As another design, the communication device 1400 is used to perform the actions performed by the network device (such as the serving cell) in the embodiment shown in FIG. 8 above, and the processing unit 1420 is used to generate at least one frequency in the satellite ephemeris of the satellite. Time information corresponding to a point, and time information corresponding to at least one frequency point can be used to determine at least one frequency point corresponding to a satellite; the transceiver unit 1410 is configured to send time information corresponding to at least one frequency point.

Optionally, the transceiver unit 1410 is further configured to send satellite ephemeris, which is used to indicate information about the satellite's orbit.

As yet another design, the communication device 1400 is configured to perform the actions performed by the terminal device in the embodiment shown in FIG. 12 above, and the processing unit 1420 is configured to measure when the cell quality of the serving cell is less than the first threshold Neighboring cell; if the cell quality of the neighboring cell is greater than or equal to the second threshold, or if the cell quality difference is greater than or equal to the third threshold, reselect to the neighboring cell; among them, the cell quality of the neighboring cell is the cell of the neighboring cell The difference between the quality and the cell quality of the serving cell. The serving cell and neighboring cells are satellite cells.

Optionally, the first threshold is equal to the second threshold.

Optionally, the transceiver unit 1410 is further configured to receive information about the first threshold and/or the second threshold.

The processing unit 1420 in FIG. 14 may be implemented by a processor or processor-related circuits. The transceiver unit 1410 may be implemented by a transceiver or transceiver-related circuits. The transceiving unit 1410 may also be referred to as a communication unit or a communication interface. The storage unit can be realized by a memory.

As shown in FIG. 15, an embodiment of the present application also provides a communication device 1500. The communication device 1500 includes a processor 1510, which is coupled with a memory 1520, the memory 1520 is used to store computer programs or instructions and/or data, and the processor 1510 is used to execute the computer programs or instructions and/or data stored in the memory 1520, This causes the method in the above method embodiment to be executed.

Optionally, the communication device 1500 includes one or more processors 1510.

Optionally, as shown in FIG. 15, the communication device 1500 may further include a memory 1520.

Optionally, the communication device 1500 includes one or more memories 1520.

Optionally, the memory 1520 may be integrated with the processor 1510 or provided separately.

Optionally, as shown in FIG. 15, the communication device 1500 may further include a transceiver 1530, and the transceiver 1530 is used for receiving and/or sending signals. For example, the processor 1510 is configured to control the transceiver 1530 to receive and/or send signals.

As a solution, the communication device 1500 is used to implement the operations performed by the terminal device in the above method embodiments.

For example, the processor 1510 is used to implement the processing-related operations performed by the terminal device in the foregoing method embodiment, and the transceiver 1530 is used to implement the transceiving-related operations performed by the terminal device in the foregoing method embodiment.

As another solution, the communication device 1500 is used to implement the operations performed by the network device (serving cell) in the above method embodiment.

For example, the processor 1510 is used to implement the processing-related operations performed by the network device in the above method embodiment, and the transceiver 1530 is used to implement the transceiving-related operations performed by the network device in the above method embodiment.

The embodiment of the present application also provides a communication device 1600, and the communication device 1600 may be a terminal device or a chip. The communication apparatus 1600 may be used to perform operations performed by the terminal device in the foregoing method embodiments.

When the communication device 1600 is a terminal device, FIG. 16 shows a simplified schematic diagram of the structure of the terminal device. It is easy to understand and easy to illustrate. In FIG. 16, the terminal device uses a mobile phone as an example. As shown in Figure 16, the terminal equipment includes a processor, a memory, a radio frequency circuit, an antenna, and an input and output device. The processor is mainly used to process the communication protocol and communication data, and to control the terminal device, execute the software program, and process the data of the software program. The memory is mainly used to store software programs and data. The radio frequency circuit is mainly used for the conversion of baseband signal and radio frequency signal and the processing of radio frequency signal. The antenna is mainly used to send and receive radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are mainly used to receive data input by users and output data to users. It should be noted that some types of terminal devices may not have input and output devices.

When data needs to be sent, the processor performs baseband processing on the data to be sent, and then outputs the baseband signal to the radio frequency circuit. The radio frequency circuit performs radio frequency processing on the baseband signal and sends the radio frequency signal to the outside in the form of electromagnetic waves through the antenna. When data is sent to the terminal device, the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into data and processes the data. For ease of description, only one memory and processor are shown in FIG. 16. In an actual terminal device product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or storage device. The memory may be set independently of the processor, or may be integrated with the processor, which is not limited in the embodiment of the present application.

In the embodiments of the present application, the antenna and radio frequency circuit with the transceiving function can be regarded as the transceiving unit of the terminal device, and the processor with the processing function can be regarded as the processing unit of the terminal device.

As shown in FIG. 16, the terminal device includes a transceiver unit 1610 and a processing unit 1620. The transceiving unit 1610 may also be referred to as a transceiver, a transceiver, a transceiving device, and so on. The processing unit 1620 may also be referred to as a processor, a processing board, a processing module, a processing device, and so on.

Optionally, the device for implementing the receiving function in the transceiving unit 1610 can be regarded as the receiving unit, and the device for implementing the sending function in the transceiving unit 1610 as the sending unit, that is, the transceiving unit 1610 includes a receiving unit and a sending unit. The transceiver unit may sometimes be called a transceiver, a transceiver, or a transceiver circuit. The receiving unit may sometimes be called a receiver, a receiver, or a receiving circuit. The transmitting unit may sometimes be called a transmitter, a transmitter, or a transmitting circuit.

For example, in an implementation manner, the transceiver unit 1610 is configured to perform the receiving operation of the terminal device in FIG. 8. For example, time information corresponding to at least one frequency point on the satellite ephemeris of the receiving satellite. The processing unit 1620 is configured to perform processing actions on the terminal device side in FIG. 8, for example, determine at least one frequency point corresponding to the satellite according to the first time and the time information corresponding to the at least one frequency point.

For another example, in an implementation manner, the processing unit 1620 is used to perform steps 1120 and 1130 in FIG. 11; the transceiving unit 1610 is used to perform the receiving operation in step 1110 in FIG. 11.

For another example, in an implementation manner, the processing unit 1620 is used to perform steps 1210, 1220, and 1230 in FIG. 12; the transceiver unit 1610 is used to perform the receiving operation of the terminal device in FIG. 12, such as step 1201.

It should be understood that FIG. 16 is only an example and not a limitation, and the foregoing terminal device including a transceiving unit and a processing unit may not rely on the structure shown in FIG. 16.

When the communication device 1600 is a chip, the chip includes a transceiver unit and a processing unit. The transceiver unit may be an input/output circuit or a communication interface; the processing unit may be a processor, microprocessor, or integrated circuit integrated on the chip.

The embodiment of the present application also provides a communication device 1700, and the communication device 1700 may be a network device or a chip. The communication device 1700 may be used to perform operations performed by a network device (serving cell) in the foregoing method embodiment.

When the communication device 1700 is a network device, for example, it is a base station. Figure 17 shows a simplified schematic diagram of the base station structure. The base station includes part 1710 and part 1720. The 1710 part is mainly used for the transmission and reception of radio frequency signals and the conversion between radio frequency signals and baseband signals; the 1720 part is mainly used for baseband processing and control of base stations. The 1710 part can usually be called a transceiver unit, transceiver, transceiver circuit, or transceiver. The 1720 part is usually the control center of the base station, and may generally be referred to as a processing unit, which is used to control the base station to execute the processing operations on the network device side in the foregoing method embodiments.

The transceiver unit of part 1710 can also be called a transceiver or a transceiver, etc. It includes an antenna and a radio frequency circuit, and the radio frequency circuit is mainly used for radio frequency processing. Optionally, the device used for implementing the receiving function in part 1710 can be regarded as the receiving unit, and the device used for implementing the sending function can be regarded as the sending unit, that is, the part 1710 includes the receiving unit and the sending unit. The receiving unit may also be called a receiver, a receiver, or a receiving circuit, etc., and the sending unit may be called a transmitter, a transmitter, or a transmitting circuit, etc.

The 1720 part may include one or more single boards, and each single board may include one or more processors and one or more memories. The processor is used to read and execute programs in the memory to implement baseband processing functions and control the base station. If there are multiple boards, each board can be interconnected to enhance processing capabilities. As an optional implementation, multiple single boards may share one or more processors, or multiple single boards may share one or more memories, or multiple single boards may share one or more processing at the same time. Device.

For example, in one implementation, the network device is the serving cell, and the transceiver unit of part 1710 is used to perform the steps related to receiving and sending in the embodiment shown in FIG. 8 performed by the serving cell; part 1720 is used to perform the implementation shown in FIG. 8 The steps related to the processing performed by the serving cell in the example.

For example, in another implementation manner, the network device is a serving cell, and the transceiver unit of part 1710 is used to perform the sending operation in step 810 in FIG. 8, and/or the transceiver unit of part 1710 is also used to perform the operation shown in FIG. 8. In the embodiment, other steps related to sending and receiving are executed by the serving cell; the processing unit of part 1720 is used to execute the steps related to the processing executed by the serving cell in the embodiment shown in FIG. 8.

For example, in yet another implementation manner, the network device is the serving cell, and the transceiver unit of part 1710 is used to perform the sending operation in step 1110 in FIG. 11; and part 1720 is used to perform the sending operation in the embodiment shown in FIG. 11 by the serving cell. Steps related to the processing performed.

For example, in yet another implementation manner, the network device is the serving cell, and part 1710 of the transceiver unit is used to perform the steps related to the sending and receiving performed by the serving cell in the embodiment shown in FIG. 12; and part 1720 is used to perform the steps shown in FIG. 12 The steps related to the processing performed by the serving cell in the embodiment.

It should be understood that FIG. 17 is only an example and not a limitation, and the foregoing network device including a transceiver unit and a processing unit may not rely on the structure shown in FIG. 17.

When the communication device 1700 is a chip, the chip includes a transceiver unit and a processing unit. Wherein, the transceiver unit may be an input/output circuit or a communication interface; the processing unit is a processor, microprocessor, or integrated circuit integrated on the chip.

The embodiment of the present application also provides a computer-readable storage medium on which is stored computer instructions for implementing the method executed by the terminal device in the above method embodiment or the method executed by the network device (such as a serving cell).

For example, when the computer program is executed by a computer, the computer can implement the method executed by the terminal device in the foregoing method embodiments, or the method executed by the network device (such as a serving cell).

The embodiments of the present application also provide a computer program product containing instructions, which when executed by a computer, cause the computer to implement the method executed by the terminal device in the foregoing method embodiments or the method executed by a network device (such as a serving cell).

The embodiment of the present application also provides a communication system, which includes the network device and the terminal device in the above embodiment.

As an example, the communication system includes: the network device and the terminal device in the embodiment described above with reference to FIG. 8.

As another example, the communication system includes: the network device and the terminal device in the embodiment described above with reference to FIG. 10.

As another example, the communication system includes: the network device and the terminal device in the embodiment described above with reference to FIG. 12.

For the explanation and beneficial effects of the relevant content in any of the communication devices provided above, reference may be made to the corresponding method embodiment provided above, and details are not repeated here.

In the embodiments of the present application, the terminal device or the network device may include a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. Among them, the hardware layer may include hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also referred to as main memory). The operating system at the operating system layer can be any one or more computer operating systems that implement business processing through processes, such as Linux operating systems, Unix operating systems, Android operating systems, iOS operating systems, or windows operating systems. The application layer can include applications such as browsers, address books, word processing software, and instant messaging software.

The embodiments of the application do not specifically limit the specific structure of the execution subject of the methods provided in the embodiments of the application, as long as the program that records the codes of the methods provided in the embodiments of the application can be run according to the methods provided in the embodiments of the application. Just communicate. For example, the execution subject of the method provided in the embodiments of the present application may be a terminal device or a network device, or a functional module in the terminal device or the network device that can call and execute the program.

Various aspects or features of the present application can be implemented as methods, devices, or products using standard programming and/or engineering techniques. The term "article of manufacture" used herein can encompass a computer program accessible from any computer-readable device, carrier, or medium. For example, computer-readable media may include, but are not limited to: magnetic storage devices (for example, hard disks, floppy disks, or tapes, etc.), optical disks (for example, compact discs (CD), digital versatile discs (digital versatile disc, DVD), etc.), etc. ), smart cards and flash memory devices (for example, erasable programmable read-only memory (EPROM), cards, sticks or key drives, etc.).

The various storage media described herein may represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" may include, but is not limited to: wireless channels and various other media capable of storing, containing, and/or carrying instructions and/or data.

It should be understood that the processor mentioned in the embodiments of this application may be a central processing unit (CPU), or may also be other general-purpose processors, digital signal processors (digital signal processors, DSP), and application-specific integrated circuits (central processing unit, CPU). application specific integrated circuit (ASIC), ready-made programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.

It should also be understood that the memory mentioned in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory can be read-only memory (ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), and electrically available Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory. The volatile memory may be random access memory (RAM). For example, RAM can be used as an external cache. As an example and not a limitation, RAM can include the following various forms: static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous dynamic random access memory (synchronous DRAM, SDRAM) , Double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (synchlink DRAM, SLDRAM) and Direct RAM Bus RAM (DR RAM).

It should be noted that when the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component, the memory (storage module) can be integrated in the processor.

It should also be noted that the memories described herein are intended to include, but are not limited to, these and any other suitable types of memories.

A person of ordinary skill in the art may be aware that, in combination with the examples described in the embodiments disclosed herein, the units and steps can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered as going beyond the scope of protection of this application.

Those skilled in the art can clearly understand that, for the convenience and conciseness of the description, the specific working process of the device and unit described above can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed device and method can be implemented in other ways. For example, the device embodiments described above are merely illustrative, for example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or It can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

In addition, the functional units in the various embodiments of the present application may be integrated into one unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.

In the above-mentioned embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented by software, it can be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, all or part of the processes or functions described in the embodiments of the present invention are generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. For example, the computer may be a personal computer, a server, or a network device. The computer instructions 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 instructions may be transmitted from a website, computer, server, or data center. Transmission to another website site, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center integrated with one or more available media. The usable medium may be a magnetic medium, (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)), etc. For example, the aforementioned available The medium can include but is not limited to: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disk or optical disk and other media that can store program code .

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A communication method, characterized in that it comprises:

Receiving time information corresponding to at least one frequency point on the satellite ephemeris of the receiving satellite;

According to the first moment and the time information corresponding to the at least one frequency point, at least one frequency point corresponding to the satellite is determined.
The method according to claim 1, wherein the method further comprises:

Receiving the satellite ephemeris, where the satellite ephemeris is used to indicate information about the orbit of the satellite;

The determining at least one frequency point corresponding to the satellite according to the first time and the time information corresponding to the at least one frequency point includes:

Determine at least one frequency point corresponding to the satellite according to the satellite ephemeris, the first moment, and time information corresponding to the at least one frequency point.
The method according to claim 1 or 2, wherein the time information corresponding to the at least one frequency point comprises:

The time period corresponding to each frequency point in the at least one frequency point, or the time period corresponding to each group of frequency points in the N groups of frequency points;

Wherein, the at least one frequency point includes the N groups of frequency points, the N groups of frequency points include at least one frequency point corresponding to the satellite, and N is an integer greater than or equal to 1.
The method according to any one of claims 1 to 3, wherein the time information corresponding to the at least one frequency point comprises:

Measuring the time information of each frequency point in the at least one frequency point.
The method according to any one of claims 1 to 4, characterized in that:

The at least one frequency point corresponding to the satellite includes: one or more frequency points corresponding to the first moment, and/or M groups of frequency points corresponding to M time periods after the first moment,

Wherein, each of the M time periods corresponds to a set of frequency points, and M is an integer greater than or equal to 1.
The method according to claim 5, wherein the method further comprises:

Measuring the frequency point corresponding to the first moment; and/or,

The frequency point corresponding to each time period is measured in each of the M time periods.
The method according to claim 5 or 6, characterized in that:

The M time periods include a first time period and a second time period, and the first time period is before the second time period;

The frequency points corresponding to the second time period include: frequency points that have an association relationship with all or part of the frequency points corresponding to the first time period.
A communication method, characterized in that it comprises:

Generating time information corresponding to at least one frequency point on the satellite ephemeris of the satellite, where the time information corresponding to the at least one frequency point can be used to determine at least one frequency point corresponding to the satellite;

Sending the time information corresponding to the at least one frequency point.
The method according to claim 8, wherein the method further comprises:

The satellite ephemeris is sent, and the satellite ephemeris is used to indicate information about the orbit of the satellite.
The method according to claim 8 or 9, wherein the time information corresponding to the at least one frequency point comprises:

The time period corresponding to each frequency point in the at least one frequency point, or the time period corresponding to each group of frequency points in the N groups of frequency points;

Wherein, the at least one frequency point includes the N groups of frequency points, the N groups of frequency points include at least one frequency point corresponding to the satellite, and N is an integer greater than or equal to 1.
The method according to any one of claims 8 to 10, wherein the time information corresponding to the at least one frequency point comprises:

Measuring the time information of each frequency point in the at least one frequency point.
A method for cell measurement, characterized in that it comprises:

When the cell quality of the serving cell is less than the first threshold, measure the neighboring cell;

In the case that the cell quality of the neighboring cell is greater than or equal to the second threshold, or the cell quality difference is greater than or equal to the third threshold, reselect to the neighboring cell;

Wherein, the cell quality difference is the difference between the cell quality of the neighboring cell and the cell quality of the serving cell, and the serving cell and the neighboring cell are satellite cells.
The method according to claim 12, wherein the first threshold is equal to the second threshold.
A communication device, characterized by being used to implement the method according to any one of claims 1 to 7, or for implementing the method according to claim 12 or 13.
A communication device, characterized by being used to implement the method according to any one of claims 8 to 11.
A communication system characterized by comprising the communication device according to claim 14 and the communication device according to claim 15.
A communication device, characterized by comprising a processor, the processor is coupled with a memory, the memory is used to store a computer program or instruction, and the processor is used to execute the computer program or instruction in the memory, so that the right The method according to any one of claims 1 to 7, or the method according to any one of claims 8 to 11 is executed, or the method according to claim 12 or 13 is executed.
A computer-readable storage medium, characterized in that it stores a computer program or instruction, and the computer program or instruction is used to implement the method according to any one of claims 1 to 7, or any one of claims 8 to 11. The method described in one item, or the method described in claim 12 or 13.
A computer program product, characterized in that the computer program product comprises a computer program or instruction, and when the computer program or instruction is executed by a computer, it causes the computer to execute the method according to any one of claims 1 to 7, or The method of any one of claims 8 to 11 is executed, or the method of claim 12 or 13.