Communication method and related device

Abstract

The invention discloses a communication method and a related device, and the method comprises the steps: indicating the EIRP bias of a data beam in system information (for example, the EIRP bias of the data beam can be a difference value between broadcast beam EIRP and data beam EIRP, or the EIRP bias of the data beam can be a difference value between broadcast beam EIRP density and data beam EIRP density); and the EIRP bias of the data beam is used for cell selection / cell reselection, so that the accuracy of cell selection / cell reselection can be improved, and the communication performance can be improved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a communication method and related devices. Background Art

[0002] Compared to terrestrial network (TN) communications (such as terrestrial cellular communications), non-terrestrial network (NTN) communications (such as satellite communications) offer significant advantages. They offer longer communication ranges, larger coverage areas, and wider frequency bands, providing users with communication services anytime, anywhere. Therefore, satellite communications have broad application prospects, particularly in international and domestic communications, emergency response, and disaster relief. Currently, satellite services primarily utilize separate broadcast and data beams. Generally speaking, a single broadcast beam can include multiple data beams within its coverage area. In scenarios where NTN and TN coexist, data beams within a single broadcast beam can have different effective isotropic radiated powers (EIRPs), meaning different service capabilities. During cell selection / reselection, the appropriate cell is determined by measuring the broadcast beam. However, since data beams within the broadcast beam's coverage area may have different EIRPs, this method of cell selection / reselection based on broadcast beam measurements is not accurate. Summary of the Invention

[0003] The present application provides a communication method and related devices, which can improve the accuracy of cell selection / cell reselection and help improve communication performance.

[0004] The present application is introduced below from different aspects. It should be understood that the implementation methods and beneficial effects of the following different aspects can be referenced to each other.

[0005] In the first aspect, the present application provides a communication method, which can be applied to the terminal side, such as the terminal or the communication module in the terminal, or the circuit or chip responsible for the communication function in the terminal (such as a modem chip, also known as a baseband chip, or a system on chip (SoC) chip or system in package (SIP) chip containing a modem core). Taking the application of this method to the terminal as an example, in this method, the terminal receives system information from the satellite, and according to the system information, the EIRP bias of the first data beam associated with the geographical location of the terminal can be determined, and then cell selection or cell reselection can be performed according to the EIRP bias of the first data beam. The above-mentioned system information includes the effective isotropic radiated power EIRP bias of one or more data beams, the coverage range of the one or more data beams is included in the coverage range of the satellite's broadcast beam, and the one or more data beams include the first data beam.

[0006] In the present application, by indicating the EIRP bias of the data beam in the system information (for example, the EIRP bias of the data beam may be the difference between the broadcast beam EIRP and the data beam EIRP, or for example, the EIRP bias of the data beam may be the difference between the broadcast beam EIRP density and the data beam EIRP density), and using the EIRP bias of the data beam for cell selection / cell reselection, the accuracy of cell selection / cell reselection can be improved, which is beneficial to improving communication performance.

[0007] In one possible implementation, the system information also includes the beam type of the data beam, and the EIRP offset of the first data beam is the EIRP offset corresponding to the beam type of the first data beam. In other words, one EIRP offset corresponds to one beam type. This implementation helps reduce the indication overhead of the EIRP offset of the data beam.

[0008] In one possible implementation, an EIRP offset corresponding to the beam type of the first data beam is determined based on an EIRP corresponding to the beam type of the first data beam and a preset EIRP, or the EIRP offset corresponding to the beam type of the first data beam is determined based on an EIRP density corresponding to the beam type of the first data beam and a preset EIRP density. This implementation is highly applicable and easy to implement.

[0009] In one possible implementation, the EIRP offset of the first data beam is determined based on the EIRP corresponding to the first data beam and a preset EIRP, or the EIRP offset of the first data beam is determined based on the EIRP density corresponding to the first data beam and a preset EIRP density. In other words, one data beam corresponds to one EIRP offset. This implementation helps improve the accuracy of indicating the EIRP offset of the data beam.

[0010] In one possible implementation, the preset EIRP is the EIRP of the broadcast beam corresponding to the first data beam, and / or the preset EIRP is the EIRP of a data beam of a certain beam type, such as the EIRP of a non-coexistence type data beam, or the EIRP of a coexistence type data beam. Alternatively, the preset EIRP density is the EIRP density of the broadcast beam corresponding to the first data beam, and / or the preset EIRP density is the EIRP density of a data beam of a certain beam type, such as the EIRP density of a non-coexistence type data beam, or the EIRP density of a coexistence type data beam. The coverage range of the non-coexistence type data beam does not overlap with the service area of ​​the ground network device, and / or the interval between the operating frequency band of the non-coexistence type data beam and the operating frequency band of the ground network device is greater than a first threshold.

[0011] In one possible implementation, the system information includes a synchronization signal block (SSB), and the EIRP offset of a data beam of a non-coexistence type among the multiple data beams is carried in the SSB. It should be understood that the EIRP offset of the non-coexistence type data beam carried in the SSB can be a value, that is, the EIRP offset corresponding to the non-coexistence type.

[0012] In this implementation, the EIRP bias of the non-coexistence type data beam is indicated in the SSB, which has strong operability.

[0013] In a possible implementation, the system information includes a system information block (SIB), and the EIRP bias of the data beam of the coexistence type among the multiple data beams is carried in the SIB. The coverage of the data beam of the coexistence type overlaps with the service area of ​​the ground network device, and the interval between the working frequency band of the data beam of the coexistence type and the working frequency band of the ground network device is less than or equal to the first threshold or the working frequency band of the data beam of the coexistence type overlaps with the working frequency band of the ground network device. It should be noted that the EIRP bias of the data beam of the coexistence type carried in the SIB may refer to an EIRP bias corresponding to the coexistence type (i.e., the EIRP bias at the beam type level), or may refer to the EIRP bias corresponding to each data beam of the coexistence type (i.e., the EIRP bias at the beam level).

[0014] In this implementation, by indicating the EIRP offset of the non-coexistence type data beam in the SSB and indicating the EIRP offset of the coexistence type data beam in the SIB, the indication overhead of the SIB can be reduced.

[0015] In one possible implementation, the system information includes an SIB, and the SIB includes an EIRP bias of a certain beam type, that is, the SIB includes an EIRP bias value. For example, in a scenario where the data beams under the coverage of a broadcast beam all belong to the same beam type, the SIB may include an EIRP bias value (or a common EIRP bias). For example, taking the case where the data beams under the coverage of a certain broadcast beam are all non-coexistence type data beams, the SIB includes an EIRP bias corresponding to the non-coexistence type. For another example, taking the case where the data beams under the coverage of a certain broadcast beam are all coexistence type data beams, the SIB includes an EIRP bias corresponding to the coexistence type.

[0016] In a possible implementation, the SIB also includes the coverage of the data beam.

[0017] In a possible implementation, performing cell selection according to the EIRP offset of the first data beam includes:

[0018] Determine a cell selection reception level value and a cell selection signal quality value of a serving cell according to the EIRP offset of the first data beam, and determine a cell selection reception level value and a cell selection signal quality value of a neighboring cell according to the EIRP offset of at least one second data beam;

[0019] The cell selection received power value and the cell selection signal quality value are used for cell selection, and the coverage range of the at least one second data beam overlaps or is adjacent to the coverage range of the first data beam.

[0020] In this implementation, by introducing the EIRP bias of the data beam into the modified S criterion, the terminal can more accurately calculate the service quality that the cell corresponding to the data beam can provide at the terminal's location, helping the terminal to make more accurate cell selection.

[0021] In a possible implementation, the cell selection reception level value Srxlev of the serving cell satisfies:

[0022] Srxlev=Q rxlevmeas '-(Q rxlevmin +Q rxlevminoffset )-P compensation -Qoffset temp ;

[0023] Among them, the Q rxlevmeas ' is the reference signal received power (RSRP) prediction value of the first data beam, the Q rxlevmeas 'Based on Q rxlevmeas and P trafficbeamoffset OK, the Q rxlevmeas is the RSRP measurement value of the broadcast beam corresponding to the first data beam, the P trafficbeamoffset is the EIRP bias of the first data beam; the Q rxlevmin is the minimum receiving power requirement of the cell, the Q rxlevminoffset For the Q rxlevmin Bias, the P compensation is the power compensation value, the Qoffset temp Temporary offset for the cell.

[0024] In a possible implementation, the cell selection signal quality value Squal of the serving cell satisfies:

[0025] Squal=Q qualmeas '-(Q qualmin +Q qualminoffset )-Qoffset temp ;

[0026] Among them, the Q qualmeas ' is the reference signal received quality (RSRQ) prediction value of the first data beam, the Q qualmeas 'Based on Qrxlevmeas 'OK, the Q rxlevmeas ' is the RSRP prediction value of the first data beam; the Q qualmin is the minimum quality value required for the cell, the Q qualminoffset For the Q qualmin Offset, the Qoffset temp Temporary offset for the cell.

[0027] In a possible implementation, performing cell reselection according to the EIRP offset of the first data beam includes:

[0028] Determine the R of the serving cell according to the EIRP bias of the first data beam s value, and determining the R of the neighboring cell according to the EIRP bias of at least one second data beam n value;

[0029] Among them, the R s value and the R n The value is used for cell reselection, and the coverage range of the at least one second data beam overlaps or is adjacent to the coverage range of the first data beam.

[0030] In this implementation, by introducing the influence of the EIRP bias of the data beam into the R criterion, the terminal can more accurately determine the reselected cell.

[0031] In a possible implementation, the R s The value satisfies:

[0032] R s =Q meas,s '+Q hyst -Qoffset temp ;

[0033] Among them, the Q meas,s ' is the RSRP prediction value of the serving cell for cell reselection after optimization, the Q meas,s 'Based on Q meas,s and P trafficbeamoffset OK, the Q meas,s is the RSRP measurement value of the serving cell used for cell reselection, the P trafficbeamoffset is the EIRP offset of the first data beam, the Qoffset temp Temporary offset for the cell.

[0034] In a possible implementation, the system information further includes one or more of the following information: a reselection priority associated with the data beam, or a reselection start threshold;

[0035] The performing cell reselection according to the EIRP offset of the first data beam includes:

[0036] Cell reselection is performed according to the EIRP bias of the first data beam, and the reselection priority and / or reselection start threshold associated with the first data beam.

[0037] In this implementation, by adding an indication of the beam-associated reselection priority and / or the reselection start threshold in the system information, both the terminal's reselection performance and the reselection measurement overhead can be taken into account.

[0038] In a second aspect, the present application provides a communication method that can be applied to a satellite, such as a satellite or a component in a satellite (such as a circuit, a chip, or a chip system). Taking the application of this method to a satellite as an example, in this method, the satellite determines system information and transmits the system information. The system information includes EIRP offsets of one or more data beams, and the coverage of the one or more data beams is included in the coverage of the satellite's broadcast beam.

[0039] In a possible implementation, the system information also includes the beam type of the data beam.

[0040] In a possible implementation, the system information includes an SSB, and an EIRP offset of a data beam of a non-coexistence type among the multiple data beams is carried in the SSB.

[0041] In a possible implementation, the system information includes a SIB, and an EIRP offset of a data beam of a coexistence type among the multiple data beams is carried in the SIB;

[0042] In which, the coverage range of the coexistence type data beam overlaps with the service area of ​​the ground network device, and the interval between the working frequency band of the coexistence type data beam and the working frequency band of the ground network device is less than or equal to the first threshold or the working frequency band of the coexistence type data beam overlaps with the working frequency band of the ground network device.

[0043] In a possible implementation, the SIB also includes the coverage of the data beam.

[0044] In a third aspect, the present application provides a communication device, which includes a unit or module for executing any method in the first to second aspects, or any possible implementation of any aspect.

[0045] In a fourth aspect, the present application provides a communication device, comprising a processor and a transceiver, wherein the processor and the transceiver are configured to execute any method of the first to second aspects, or any possible implementation of any of the aspects.

[0046] Optionally, the communication device also includes a memory in which a computer program is stored; the above-mentioned processor and transceiver are used to call the computer program in the memory, so that the communication device executes any method in the first aspect to the second aspect, or a method shown in any possible implementation of any aspect therein.

[0047] In one possible design, the communication device may be a chip that implements the above method or a device including a chip.

[0048] In a fifth aspect, the present application provides a communication device, which includes a processor and an interface circuit, the interface circuit being used to receive signals from other communication devices outside the communication device and transmit them to the processor or send signals from the processor to other communication devices outside the communication device, and the processor being used to implement any method as described in any of the first to second aspects, or any possible implementation of any of the aspects, through a logic circuit or executing code instructions.

[0049] In a sixth aspect, the present application provides a computer-readable storage medium storing a computer program or instruction. When the computer program or instruction is executed by a computer, the method as shown in any method in the first to second aspects, or any possible implementation of any aspect thereof, is implemented.

[0050] In a seventh aspect, the present application provides a computer program product. When a computer reads and executes the computer program product, the computer executes any method in the first to second aspects, or a method shown in any possible implementation of any aspect.

[0051] In an eighth aspect, the present application provides a chip system comprising at least one processor and an interface, wherein the processor is used to read and execute instructions stored in a memory. When the instructions are executed, the chip executes a method as described in any one of the first aspect or the second aspect, or a method as shown in any possible implementation of any aspect.

[0052] In a ninth aspect, the present application provides a communications system, which may include a terminal and a satellite. The terminal is configured to perform the method described in the first aspect or any possible implementation of the first aspect. The satellite is configured to perform the method described in the second aspect or any possible implementation of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 is a schematic diagram of the architecture of a communication system used in an embodiment of the present application;

[0054] Figure 2 is a schematic diagram of a broadcast beam and a data beam provided in an embodiment of the present application;

[0055] Figure 3 This is a flow chart of a communication method provided in an embodiment of the present application;

[0056] Figure 4 is a schematic structural diagram of a possible communication device provided in an embodiment of the present application;

[0057] Figure 5 It is a schematic structural diagram of a possible communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0058] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application.

[0059] In the description of this application, "first" and "second" etc. are only used to distinguish different objects, rather than to describe a specific order. In addition, unless otherwise specified, " / " means "or", for example, A / B can mean A or B. "And / or" in this article is merely a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, "at least one" means one or more, and "plurality" means two or more. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c can mean: a, b, c; a and b; a and c; b and c; or a and b and c. Among them, a, b, c can be single or multiple.

[0060] The terms "comprise," "include," "have," and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0061] In this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "exemplary," "for example," or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary," "for example," or "for example" is intended to present the relevant concepts in a concrete way.

[0062] It can be understood that in this application, "when", "if" and "if" all mean that the device will perform corresponding processing under certain objective circumstances, and do not limit the time. It does not require that the device must perform a judgment action when it is implemented, nor does it mean that there are other limitations.

[0063] Elements used in the singular herein are intended to mean "one or more" rather than "one and only one" unless specifically stated otherwise.

[0064] It is understood that in each embodiment of the present application, "A corresponds to B" means that there is a corresponding relationship between A and B, and B can be determined according to A. Determining B according to A does not mean determining B only according to A, and B can also be determined according to A and / or other information.

[0065] To better understand the embodiments of the present application, the following first introduces the system architecture involved in the embodiments of the present application:

[0066] See Figure 1 , Figure 1 This is a schematic diagram of the architecture of the communication system used in the embodiment of this application. It should be noted that, Figure 1 A possible, non-limiting system diagram is shown in FIG. Figure 1 As shown, the communication system 10 includes a radio access network (RAN) 100 and a core network (CN) 200. Optionally, the communication system 10 may also include the Internet 300. The RAN 100 includes at least one RAN node (e.g., Figure 1 110a and 110b, collectively referred to as 110) and at least one terminal (such as Figure 1 120a-120j in the figure, collectively referred to as 120). The RAN 100 may also include other RAN nodes, such as wireless relay devices and / or wireless backhaul devices ( Figure 1(not shown) etc. Terminal 120 is wirelessly connected to RAN node 110. RAN node 110 is wirelessly or wiredly connected to core network 200. The core network elements in core network 200 and RAN node 110 in RAN 100 can be separate physical devices, or they can be the same physical device integrating core network logical functions and radio access network logical functions, or they can be a single physical device integrating some core network element functions and some RAN node 110 functions. Terminals and RAN nodes 110 can be connected to each other via wired or wireless means. Figure 1 This is just a schematic diagram. The communication system may also include other network devices, such as wireless relay devices and wireless backhaul devices. Figure 1 Not drawn in the middle.

[0067] The RAN 100 may be a cellular system related to the Third Generation Partnership Project (3GPP), such as a 4G or 5G mobile communication system, or a future-oriented evolutionary system (such as a 6G mobile communication system). The RAN 100 may also be an open access network (O-RAN or ORAN), a cloud radio access network (CRAN), or a wireless fidelity (WiFi) system. The RAN 100 may also be a communication system that integrates two or more of the above systems.

[0068] The RAN node 110, sometimes also referred to as a radio access network device, access network device, RAN entity, or access node, constitutes part of a communication system and is used to help terminals achieve wireless access. The multiple RAN nodes 110 in the communication system 10 can be nodes of the same type or different types. In some scenarios, the roles of the RAN node 110 and the terminal 120 are relative, for example, Figure 1 The network element 120i can be a helicopter or a drone, which can be configured as a mobile base station. For the terminals 120j that access the RAN 100 through the network element 120i, the network element 120i is a base station; but for the base station 110a, the network element 120i is a terminal. The RAN node 110 and the terminal 120 are sometimes referred to as communication devices, for example Figure 1 The network elements 110a and 110b may be understood as communication devices having base station functions, and the network elements 120a-120j may be understood as communication devices having terminal functions.

[0069] In one possible scenario, the RAN node 110 may be a base station, an evolved NodeB (eNodeB), an access point (AP), a transmission reception point (TRP), a next generation NodeB (gNB), a next generation base station in a sixth generation (6G) mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system. The RAN node 110 may be a macro base station (e.g., Figure 1 110a in), micro base stations or indoor stations (such as Figure 1 110b in the present application), a relay node or a donor node, or a wireless controller in a CRAN scenario. Optionally, the RAN node 110 may also be a server, a wearable device, a vehicle or an on-board device, etc. For example, the wireless access network device in the vehicle to everything (V2X) technology may be a road side unit (RSU). All or part of the functions of the RAN node 110 in this application may also be implemented by software functions running on hardware, or by virtualization functions instantiated on a platform (such as a cloud platform). The RAN node 110 in this application may also be a logical node, a logical module or software that can implement all or part of the functions of the RAN node 110.

[0070] In another possible scenario, multiple RAN nodes 110 collaborate to assist the terminal in achieving wireless access, and different RAN nodes 110 respectively implement part of the functions of the base station. For example, the RAN node 110 can be a centralized unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU). The CU and DU can be set separately or included in the same network element, such as a baseband unit (BBU). The RU can be included in a radio frequency device or radio frequency unit, such as a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH).

[0071] In different systems, CU (or CU-CP and CU-UP), DU or RU may also have different names, but those skilled in the art can understand their meanings. For example, in the ORAN system, CU may also be called O-CU (Open CU), DU may also be called O-DU, CU-CP may also be called O-CU-CP, CU-UP may also be called O-CU-UP, and RU may also be called O-RU. For the convenience of description, this application uses CU, CU-CP, CU-UP, DU and RU as examples for description. Any unit of CU (or CU-CP, CU-UP), DU and RU in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0072] A terminal may also be referred to as a terminal device, user equipment (UE), mobile station, mobile terminal, etc. The terminal can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (IOT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wearable, smart transportation, smart city, etc. The terminal can be a mobile phone, tablet computer, computer with wireless transceiver function, wearable device, vehicle, drone, helicopter, airplane, ship, robot, robotic arm, smart home device, etc. The embodiments of the present application do not limit the device form of the terminal.

[0073] For ease of description, the following description uses a base station as an example of RAN node 110. Base stations and terminals can be fixed or mobile. They can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; on water; or on aircraft, balloons, and satellites. The embodiments of this application do not limit the application scenarios of base stations and terminals.

[0074] The roles of base stations and terminals can be relative, for example, Figure 1The helicopter or drone 120i in the figure can be configured as a mobile base station. For the terminals 120j that access the wireless access network 100 through 120i, the terminal 120i is a base station; but for the base station 110a, 120i is a terminal, that is, the communication between 110a and 120i is carried out through the wireless air interface protocol. Of course, the communication between 110a and 120i can also be carried out through the interface protocol between base stations. In this case, relative to 110a, 120i is also a base station. Therefore, base stations and terminals can be collectively referred to as communication devices. Figure 1 110a and 110b in the figure can be called communication devices with base station functions. Figure 1 120a-120j in the figure can be called communication devices with terminal functions.

[0075] Communication between base stations and terminals, between base stations, and between terminals can be carried out through authorized spectrum, unauthorized spectrum, or both; communication can be carried out through spectrum below 6 gigahertz (GHz), spectrum above 6 GHz, or spectrum below 6 GHz and spectrum above 6 GHz. The embodiments of the present application do not limit the spectrum resources used for wireless communication.

[0076] In the embodiments of the present application, the functions of the base station may also be performed by a module (such as a chip) in the base station, or by a control subsystem that includes the base station functions. The control subsystem that includes the base station functions here may be a control center in the above-mentioned application scenarios such as smart grid, industrial control, smart transportation, and smart city. The functions of the terminal may also be performed by a module (such as a chip or modem) in the terminal, or by a device that includes the terminal functions.

[0077] In this application, a base station sends downlink signals or downlink information to a terminal, and the downlink information is carried on a downlink channel; the terminal sends uplink signals or uplink information to the base station, and the uplink information is carried on an uplink channel. In order to communicate with the base station, the terminal needs to establish a wireless connection in the cell controlled by the base station. The cell with which the terminal has established a wireless connection is called the serving cell of the terminal. When the terminal communicates with the serving cell, it will also be interfered with by signals from neighboring cells.

[0078] To facilitate understanding of the relevant contents of the embodiments of this application, some of the knowledge / terms required for the present application are introduced below. It should be noted that these explanations are intended to make the embodiments of this application easier to understand and should not be regarded as limiting the scope of protection claimed by this application.

[0079] 1. System Information (SI)

[0080] In the new radio (NR) system, SI can be divided into three categories: master information block (MIB), system information block 1 (SIB1) and other system information (OSI). SIB1 can also be described as remaining minimum system information (RMSI), and OSI includes other SIBs except SIB1. Among them, MIB is carried on the physical broadcast channel (PBCH) and is bound to the synchronization signal, called SSB. It should be understood that SSB can also be called synchronization signal / physical broadcast channel (SS / PBCH) block.

[0081] 2. Radio resource management (RRM) measurements

[0082] Mobility management is a key operation in wireless mobile communications. When the signal quality of a terminal's serving cell deteriorates to a certain level, it changes the terminal's serving cell through handover (connected state behavior) or cell selection / reselection (disconnected state behavior). This involves selecting a neighboring cell with better communication quality as the terminal's new serving cell to ensure that the communication link between the base station and the terminal is not interrupted due to the terminal's mobility.

[0083] RRM measurement allows a terminal to monitor the communication quality of its serving cell and / or neighboring cells (i.e., non-serving cells) in real time. The handover and cell selection / reselection involved in the aforementioned mobility management operations are based on RRM measurement results, making RRM measurement the foundation of mobility management.

[0084] Depending on the RRC state of the terminal, RRM measurements can be divided into connected state measurements and non-connected state (i.e., idle state / inactive state) measurements. Specifically, when the terminal is in idle state or inactive state, the base station can broadcast a measurement configuration. The terminal performs measurements based on the broadcast measurement configuration and uses the measurement results for operations such as cell selection / reselection without reporting the measurement results to the base station. When the terminal is in a connected state, the base station can configure the terminal to perform measurements based on the measurement configuration and report the measurement results. Based on the measurement results reported by the terminal, the base station can decide whether to initiate a handover for the terminal and change the serving cell for the terminal.

[0085] Based on the relationship between the measurement frequency and the serving cell frequency, RRM measurements can be divided into intra-frequency measurement, inter-frequency measurement, and inter-RAT measurement. Inter-system measurement refers to measurements on systems other than the 5G NR system (for example, measurements on 2G / 3G / 4G (LTE) systems). Intra-frequency measurement and inter-frequency measurement are intra-RAT measurements. Specifically:

[0086] For the measurement of the same frequency point (referred to as the same frequency measurement), the base station is configured with two quality thresholds: S IntraSearchP and S IntraSearchQ , where when the RSRP quality of the serving cell Srxlev> threshold S IntraSearchP , and the RSRQ quality Squal of the serving cell> threshold S IntraSearchQ When , the terminal does not perform the same-frequency measurement; otherwise, it must perform the same-frequency measurement.

[0087] For the measurement of inter-frequency / inter-system (inter-RAT) frequencies, if the priority of the measurement frequency is higher than that of the serving cell frequency, the terminal will unconditionally start the measurement of the inter-frequency / inter-system (inter-RAT) frequency regardless of the signal quality of the serving cell; if the priority of the measurement frequency is lower than or equal to that of the serving cell frequency, the base station configures two quality thresholds: S nonIntraSearchP and S nonIntraSearchQ , where when the serving cell RSRP quality Srxlev> threshold S nonIntraSearchP , and the serving cell RSRQ quality Squal> threshold S nonIntraSearchQ When , the terminal does not perform the measurement of different frequencies / different system frequencies. Otherwise, it must perform the measurement of different frequencies / different system frequencies.

[0088] 1) Cell selection

[0089] If a terminal wants to obtain network services, it needs to select a cell in a public land mobile network (PLMN) to reside in. During the cell search process, many cells will be found. It is necessary to determine whether the current cell is suitable for residency based on the cell system information and terminal attributes. Cell level and signal quality are one of the evaluation criteria. Specifically, the terminal can determine whether a cell is suitable based on the S criterion. In other words, cell selection follows the S criterion, which is:

[0090] If a terminal wants to stay in a cell, the cell must meet the following conditions:

[0091] Srxlev>0 and Squal>0;

[0092] Srxlev=Q rxlevmeas -(Q rxlevmin +Q rxlevminoffset )-P compensation -Qoffset temp ;

[0093] Squal=Q qualmeas -(Q qualmin +Q qualminoffset )-Qoffset temp .

[0094] in:

[0095] Srxlev is the cell selection RX level value (dB);

[0096] Squal is the cell selection quality value (dB);

[0097] Q rxlevmeas The measured cell RX level value (RSRP) is the actual cell reception level value (reference signal received power) measured by the terminal;

[0098] Q rxlevmin The minimum required RX level in the cell or the minimum received power requirement of the cell.

[0099] Q rxlevminoffset Q rxlevmin The offset / bias;

[0100] P compensation is the power compensation value, which is equal to max(PEMAX -P PowerClass ,0),P EMAX P is the maximum TX power level a UE may use when transmitting on the uplink in the cell. PowerClass is the maximum output power determined according to the terminal power level, where P PowerClass is the transmission capability of the terminal itself, that is, the maximum output power determined by the terminal according to the power level, P EMAX The maximum output power allowed by the base station for the terminal;

[0101] Qoffset temp Temporary offset / bias of a cell (offset temporarily applied to acell);

[0102] Q qualmeas is the measured cell signal quality value (reference signal received quality) (measured cell quality value (RSRQ));

[0103] Q qualmin is the minimum required quality level in the cell;

[0104] Q qualminoffset Q qualmin The offset / bias of

[0105] It should be understood that in the above formula, except for Q rxlevmeas and Q qualmeas ,The remaining variables are high-level parameters configured through system information.

[0106] 2) Cell reselection

[0107] Based on the RRM measurement results, the terminal performs cell reselection according to the following principles:

[0108] ① Reselection of neighboring cells with high priority frequencies:

[0109] If the network is configured with threshServingLowQ, then:

[0110] In a period of time, the neighboring cell RSRQ quality in TreselectionRAT satisfies Squal>Thresh x,highQ, and the terminal stays in the current serving cell for more than 1s, the terminal will use the neighboring cell as the target cell for reselection.

[0111] If the network is not configured with threshServingLowQ, then:

[0112] In a period of time, the RSRP quality of the neighboring cells in TreselectionRAT satisfies Srxlev>Thresh x,highP If the terminal stays in the current serving cell for more than 1 second, the terminal will use the neighboring cell as the target cell for reselection.

[0113] ② Reselection of same-frequency neighboring cells or equal-priority inter-frequency / inter-system (inter-RAT) neighboring cells:

[0114] If the neighboring cell has a better R value ranking than the serving cell, and the neighboring cell R value is continuously better than the serving cell R value within a period of TreselectionRAT, and the terminal stays on the current serving cell for more than 1s, the terminal will select the neighboring cell as the target cell for reselection.

[0115] The R value calculation formula is as follows:

[0116] R s =Q meas,s +Q hyst -Qoffset temp ;

[0117] R n =Q meas,n -Qoffset-Qoffset temp ;

[0118] Among them, R s is the R value of the serving cell, Q meas,s is the RSRP measurement value of the serving cell used for cell reselection, Q hyst is the cell reselection hysteresis value, Qoffset temp It is the temporary offset of the cell. n is the R value of the neighboring area, Q meas,n is the RSRP measurement value of the neighboring cell used for cell reselection, and Qoffset is the neighboring cell reselection offset. hyst , Qoffset temp ,Qoffset is a high-level parameter and is configured through system information.

[0119] ③ Reselection of neighboring cells with low priority frequencies:

[0120] If the network is configured with threshServingLowQ, then:

[0121] The RSRQ quality of the serving cell meets Squal within a period of TreselectionRAT <Thresh Serving,LowQ , and the RSRQ quality of the neighboring cells with low priority frequency points satisfies Squal>Thresh x,lowQ , and if the terminal stays on the current serving cell for more than 1s, the neighboring cell is considered to be the target cell for reselection.

[0122] If the network is not configured with threshServingLowQ, then:

[0123] The RSRP quality of the serving cell meets Srxlev within a period of TreselectionRAT <Thresh Serving,LowP , and the RSRP quality of the neighboring cells of the low priority frequency point satisfies Srxlev>Thresh x,lowP , and if the terminal stays on the current serving cell for more than 1s, the neighboring cell is considered to be the target cell for reselection.

[0124] For NTN systems, the terminal can also calculate the distance between its own geographical location and a reference point and compare it with a distance threshold. If the distance threshold is exceeded, neighbor measurement is initiated. Optionally, neighbor measurement can also be initiated based on service time.

[0125] Currently, satellites mainly provide services by separating broadcast beams and data beams. Generally speaking, a broadcast beam can include multiple data beams within its coverage area, such as Figure 2 As shown, the coverage of the broadcast beam SSB1 includes 7 data beams, of which 2 are coexistence type data beams and 5 are non-coexistence type data beams. In the NTN and TN coexistence scenario, the data beams within the coverage of a broadcast beam can have different effective isotropic radiated power (EIRP), that is, different service capabilities. When performing cell selection / cell reselection, the appropriate cell is determined by measuring the broadcast beam. Since the data beams within the coverage of the broadcast beam may have different EIRPs, this method of performing cell selection / cell reselection based on the measurement results of the broadcast beam is not accurate enough.

[0126] Based on this, the present application proposes a communication method that can improve the accuracy of cell selection / cell reselection results, which is conducive to improving communication performance.

[0127] The communication method and communication device provided by this application are described in detail below:

[0128] See Figure 3, Figure 3 This is a flow chart of the communication method provided in the embodiment of the present application. Figure 3 As shown, the communication method may include the following steps S301 to S302. Figure 3 The method shown can be performed by a satellite or a terminal. Figure 3 The execution subject of the method shown can also be a satellite or a chip in a terminal. For the convenience of description, this application mainly uses satellites or terminals as the execution subject for explanation. It should be understood that Figure 3 This is a schematic flow chart of an embodiment of the method of the present application, which shows the detailed communication steps or operations of the method, but these steps or operations are only examples, and the embodiment of the present application may also perform other operations or Figure 3 In addition, Figure 3 The steps in Figure 3 are executed in a different order than those presented, and may not be executed in the order Figure 3 All operations in . Among them:

[0129] S301: A satellite sends system information to a terminal. Correspondingly, the terminal receives the system information from the satellite.

[0130] In some feasible implementations, a satellite may determine the coverage of one or more data beams based on the satellite's operating frequency band and the satellite's transmission capability (e.g., the number of satellite antennas). It should be understood that the coverage of a satellite's broadcast beam includes the coverage of one or more data beams, and the coverage of different data beams may overlap or may not overlap at all, without limitation.

[0131] It should be understood that the satellite can send system information to the terminal, and the system information includes the EIRP bias of one or more data beams. The inclusion of the EIRP bias of the data beam in the system information can be understood as the system information directly including the value of the EIRP bias of the data beam, or the system information includes indication information for indicating the EIRP bias of the data beam (for example, the indication information can be an identifier / index of the EIRP bias, where an identifier / index of an EIRP bias corresponds to an EIRP bias value, and the EIRP bias values ​​corresponding to identifiers / indexes of different EIRP biases can be predefined or preconfigured by the protocol, etc., and are not limited). Optionally, the system information can also include one or more information of the beam type of the data beam, the coverage range of the data beam, the reselection priority associated with the data beam, or the reselection start threshold. The beam type of the data beam includes a coexistence type and a non-coexistence type. The coverage of the coexistence type data beam overlaps with the service area of ​​the ground network device, and the interval between the working frequency band of the coexistence type data beam and the working frequency band of the ground network device is less than or equal to the first threshold, or the working frequency band of the coexistence type data beam overlaps with the working frequency band of the ground network device; the coverage of the non-coexistence type data beam does not overlap with the service area of ​​the ground network device, and / or the interval between the working frequency band of the non-coexistence type data beam and the working frequency band of the ground network device is greater than the first threshold. Optionally, the coexistence type data beam can be further divided into different coexistence subtypes, such as coexistence subtype one, coexistence subtype two or coexistence subtype three, etc., without limitation. For ease of understanding, the following application mainly uses the coexistence type data beam and the non-coexistence type data beam as examples for schematic explanation.

[0132] In one possible implementation, the EIRP bias of the above-mentioned data beam may refer to the EIRP bias corresponding to the beam type of the data beam. For example, assuming there are 7 data beams, namely data beam 1 to data beam 7, wherein the beam types of data beams 1 and 2 are coexistence types, and the beam types of data beams 3 to data beam 7 are non-coexistence types, wherein the data beams with the beam type of the coexistence type correspond to EIRP bias 1, and the data beams with the beam type of the non-coexistence type correspond to EIRP bias 2, that is, one beam type corresponds to one EIRP bias (or the EIRP bias is a beam type-level value). It is understandable that the EIRP bias corresponding to each beam type can be determined based on the EIRP corresponding to each beam type and a preset EIRP, or the EIRP bias corresponding to each beam type can be determined based on the EIRP density corresponding to each beam type and a preset EIRP density.

[0133] For example, taking data beam 1 as an example, the EIRP offset corresponding to the beam type of data beam 1 can be determined based on the EIRP corresponding to the beam type of data beam 1 and a preset EIRP. For example, assuming the EIRP corresponding to the beam type of data beam 1 is 48 dBw and the preset EIRP is 30 dBw, the EIRP offset corresponding to the beam type of data beam 1 can be 18 dB, or the EIRP offset of data beam 1 is said to be 18 dB.

[0134] As another example, taking data beam 1 as an example, the EIRP offset corresponding to the beam type of data beam 1 can be determined based on the EIRP density corresponding to the beam type of data beam 1 and a preset EIRP density. For example, assuming the EIRP density corresponding to the beam type of data beam 1 is 48 dBw / Mhz and the preset EIRP density is 30 dBw / Mhz, the EIRP offset corresponding to the beam type of data beam 1 can be 18 dB, or the EIRP offset of data beam 1 is said to be 18 dB.

[0135] In another possible implementation, the EIRP bias of the above-mentioned data beam may refer to the EIRP bias corresponding to the data beam. For example, assuming there are 7 data beams, namely data beam 1 to data beam 7, where data beam 1 corresponds to EIRP bias 1, data beam 2 corresponds to EIRP bias 2, data beam 3 corresponds to EIRP bias 3, data beam 4 corresponds to EIRP bias 4, data beam 5 corresponds to EIRP bias 5, data beam 6 corresponds to EIRP bias 6, and data beam 7 corresponds to EIRP bias 7. In other words, one data beam corresponds to one EIRP bias (or the EIRP bias is a beam-level value). It is understandable that the EIRP bias of each data beam can be determined based on the EIRP corresponding to each data beam and a preset EIRP, or the EIRP bias of each data beam can be determined based on the EIRP density corresponding to each data beam and a preset EIRP density.

[0136] For example, taking data beam 1 as an example, the EIRP offset corresponding to data beam 1 can be determined based on the EIRP corresponding to data beam 1 and the preset EIRP. For example, assuming that the EIRP corresponding to data beam 1 is 40 dBw and the preset EIRP is 30 dBw, the EIRP offset for data beam 1 is 10 dB.

[0137] As another example, taking data beam 1 as an example, the EIRP offset corresponding to data beam 1 can be determined based on the EIRP density corresponding to data beam 1 and a preset EIRP density. For example, assuming the EIRP density corresponding to data beam 1 is 40 dBw / Mhz and the preset EIRP density is 30 dBw / Mhz, the EIRP offset for data beam 1 is 10 dB.

[0138] It is understandable that the above-mentioned preset EIRP or preset EIRP density may be predefined, preconfigured, or configured by the protocol and is not limited. Taking the preset EIRP as an example, in one possible implementation, the preset EIRP may be a common value / specific value, which is universal, that is, it can participate in / be used for the EIRP bias calculation of multiple data beams or all data beams. In another possible implementation, the preset EIRP may be related to the corresponding data beam. For example, assuming that the EIRP bias of the first data beam needs to be calculated, the preset EIRP may be the EIRP of the broadcast beam corresponding to the first data beam. In another possible implementation, the preset EIRP may be the EIRP of a non-coexistence type data beam. In another possible implementation, the preset EIRP may be the EIRP of a coexistence type data beam.

[0139] Exemplarily, the system information involved in the present application may refer to an SIB, wherein the SIB includes the EIRP bias of all data beams in the one or more data beams mentioned above, that is, the SIB includes the EIRP bias of the coexistence type data beam and the EIRP bias of the non-coexistence type data beam. Optionally, the SIB also includes one or more information of the beam type of the data beam, the coverage range of the data beam, the reselection priority associated with the data beam, or the reselection start threshold. Here, the EIRP bias of the coexistence type data beam in the SIB may refer to an EIRP bias corresponding to the coexistence type, or may refer to the EIRP bias corresponding to each data beam belonging to the coexistence type (i.e., the beam-level EIRP bias). Similarly, the EIRP bias of the non-coexistence type data beam in the SIB may refer to an EIRP bias corresponding to the non-coexistence type, or may refer to the EIRP bias corresponding to each data beam belonging to the non-coexistence type.

[0140] As another example, the system information involved in this application may refer to SSB, where the SSB includes the EIRP offset of the data beam of the non-coexistence type in the one or more data beams. In one possible implementation, the EIRP offset of the non-coexistence type data beam may be the difference between the EIRP of the non-coexistence type data beam and the EIRP of its associated broadcast beam, for example, P beamoffsetIndicates the EIRP offset of the non-coexistence type data beam. Here, the EIRP offset of the non-coexistence type data beam in SSB generally refers to an EIRP offset corresponding to the non-coexistence type.

[0141] As another example, the system information involved in the present application may refer to an SIB, wherein the SIB includes the EIRP bias of the data beam of the coexistence type in the one or more data beams mentioned above. It should be noted that the EIRP bias of the data beam of the coexistence type carried in the SIB may refer to an EIRP bias corresponding to the coexistence type (i.e., the EIRP bias at the beam type level), or it may refer to the EIRP bias corresponding to each coexistence type of data beam (i.e., the EIRP bias at the beam level). Optionally, the SIB may also carry one or more information including the beam type of the data beam, the coverage of the data beam, the reselection priority associated with the data beam, or the reselection start threshold, etc., which is not limited in this application. Optionally, the SIB may also indicate the coverage of the broadcast beam.

[0142] In one implementation manner 1, the coverage of the data beam carried in the SIB may include the coverage of the coexistence type data beam, but exclude the coverage of the non-coexistence type data beam.

[0143] In an implementation method 2, the coverage of the data beam carried in the SIB may include both the coverage of the coexistence type data beam and the coverage of the non-coexistence type data beam, without limitation.

[0144] Exemplarily, for the coverage range of a data beam, the coverage range may be indicated by a beam position identifier associated with the data beam, or by reference point coordinates and a radius.

[0145] It should be noted that indicating the EIRP bias of the non-coexistence type data beam in the SSB and indicating the EIRP bias of the coexistence type data beam in the SIB is beneficial to reducing / minimizing the indication overhead of the SIB.

[0146] S302: The terminal determines an EIRP offset of a first data beam associated with a geographical location of the terminal according to system information.

[0147] In some feasible implementations, the terminal may determine the first data beam associated with the terminal's geographical location and the EIRP bias of the first data beam based on its own geographical location and the information of each data beam carried in the system information. Specifically, as described in the aforementioned step S301, in one possible implementation, the EIRP bias of the first data beam may be the EIRP bias corresponding to the beam type of the first data beam, wherein the EIRP bias corresponding to the beam type of the first data beam is determined based on the EIRP corresponding to the beam type of the first data beam and a preset EIRP. In another possible implementation, the EIRP bias of the first data beam is determined based on the EIRP corresponding to the first data beam and a preset EIRP, which will not be elaborated here.

[0148] S303: The terminal performs cell selection or cell reselection according to the EIRP offset of the first data beam.

[0149] In some feasible implementations, the terminal may perform cell selection or cell reselection based on the EIRP bias of the first data beam.

[0150] The following explains in detail how the terminal performs cell selection according to the EIRP offset of the first data beam.

[0151] Specifically, the terminal can determine the cell selection reception power value and cell selection signal quality value of the serving cell based on the EIRP offset of the first data beam, and determine the cell selection reception power value and cell selection signal quality value of the neighboring cell based on the EIRP offset of at least one second data beam. The coverage of the at least one second data beam overlaps or is adjacent to the coverage of the first data beam. The cell selection reception power value and cell selection signal quality value can be used for cell selection. It is understood that when the cell selection reception power value Srxlev of a cell is greater than 0 and the cell selection signal quality value Squal of the cell is greater than 0, the cell can be determined to be a suitable cell and selected for camping. Optionally, if there are multiple suitable cells, the cell with the highest Srxlev, the highest Squal, or both Srxlev and Squal can be determined as the target cell. Alternatively, a weighted sum of Srxlev and Squal can be taken, for example, a weight of 1*Srxlev + a weight of 2*Squal, and the cell with the largest weighted sum is determined as the target cell. It should be noted that this implementation method allows the terminal to obtain system information, estimate the actual service quality of the area where it is located, and then determine the appropriate cell (that is, search for multiple strongest cells at the same frequency point, and determine the appropriate cell after comparing Srxlev and Squal). It can more accurately select a cell that can provide better service quality in a frequency point for residence, which can reduce the subsequent cell reselection or cell switching overhead after access.

[0152] Exemplarily, the cell selection reception level value Srxlev of the serving cell satisfies:

[0153] Srxlev=Q rxlevmeas '-(Q rxlevmin +Q rxlevminoffset )-P compensation -Qoffset temp ;

[0154] Among them, Q rxlevmeas ' is the RSRP prediction value of the first data beam, Q rxlevmeas 'Based on Q rxlevmeas and P trafficbeamoffset OK, Q rxlevmeas is the RSRP measurement value of the broadcast beam corresponding to the first data beam, P trafficbeamoffset is the EIRP bias of the first data beam; Q rxlevmin is the minimum receiving power requirement of the cell, Q rxlevminoffset Q rxlevmin Bias, P compensation is the power compensation value, Qoffset temp Temporary offset for the cell.

[0155] For example, the above Q rxlevmeas 'Based on Q rxlevmeas and P trafficbeamoffset This can be done in two ways:

[0156] (1) When the preset EIRP is a common value / specific value, or the preset EIRP is the EIRP of the broadcast beam corresponding to the first data beam, Q rxlevmeas '=Q rxlevmeas +P trafficbeamoffset .

[0157] (2) When the preset EIRP is the EIRP of the non-coexistence type data beam, and P trafficbeamoffset When Q is the difference between the EIRP corresponding to the first data beam and the EIRP of the non-coexistence type data beam, if the terminal is in the coverage of the non-coexistence type data beam (or the beam type of the first data beam is the non-coexistence type), then Q rxlevmeas '=Q rxlevmeas +P beamoffset If the terminal is in the coverage of the coexistence type data beam (or the beam type of the first data beam is the coexistence type), then Q rxlevmeas '=Q rxlevmeas +P beamoffset +P trafficbeamoffset , where P beamoffset is the difference between the EIRP of the broadcast beam and the EIRP of the associated non-coexistence type data beam, P trafficbeamoffset is the difference between the EIRP of the first data beam of the coexistence type and the EIRP of the data beam of the non-coexistence type.

[0158] Exemplarily, the cell selection signal quality value Squal of the serving cell satisfies:

[0159] Squal=Q qualmeas '-(Q qualmin +Q qualminoffset )-Qoffset temp ;

[0160] Among them, Q qualmeas ' is the RSRQ prediction value of the first data beam, Q qualmeas 'Based on Q rxlevmeas 'OK, Q rxlevmeas ' is the RSRP prediction value of the first data beam; Q qualmin is the minimum quality value required for the cell, Q qualminoffset Q qualmin Offset, Qoffset temp Temporary offset for the cell.

[0161] Similarly, the calculation of the cell selection reception level value and the cell selection signal quality value of the neighboring area also satisfies the above formula. The difference is that when calculating the cell selection reception level value and the cell selection signal quality value of the neighboring area, the parameters related to the first data beam in the formula need to be replaced with parameters related to the second data beam, which will not be repeated here.

[0162] The following is a detailed explanation of the terminal performing cell reselection according to the EIRP offset of the first data beam.

[0163] Specifically, the terminal can determine the R of the serving cell according to the EIRP offset of the first data beam. s value, and determining the R of the neighboring cell according to the EIRP bias of at least one second data beam n Value. Among them, R s Value and R n The value is used for cell reselection, and the coverage of at least one second data beam overlaps or is adjacent to the coverage of the first data beam.

[0164] For example, the R s The value satisfies:

[0165] R s =Q meas,s '+Q hyst -Qoffset temp ;

[0166] Among them, Q meas,s ' is the RSRP prediction value of the serving cell used for cell reselection after optimization, Q meas,s 'Based on Q meas,s and P trafficbeamoffset OK (e.g. Q meas,s '=Q meas,s +P trafficbeamoffset ), Q meas,s is the RSRP measurement value of the serving cell used for cell reselection, P trafficbeamoffset is the EIRP offset of the first data beam, Qoffset temp Temporary offset for the cell.

[0167] Similarly, the R n The value satisfies:

[0168] R n =Q meas,n '-Qoffset-Qoffset temp ;

[0169] Among them, Q meas,n ' is the RSRP prediction value of the neighboring cell used for cell reselection after optimization, Q meas,n 'Based on Q meas,nand P trafficbeamoffset OK (e.g. Q meas,n '=Q meas,n +P trafficbeamoffset ), Q meas,n is the RSRP measurement value of the neighboring cell used for cell reselection, P trafficbeamoffset is the EIRP offset of the first data beam, Qoffset is the neighboring cell reselection offset, Qoffset temp Temporary offset for the cell.

[0170] Optionally, Q meas,s ' can also be calculated by averaging the RSRP measurements of multiple data beams, where the RSRP measurement value of each data beam needs to be determined by the corresponding EIRP bias. For example, in the dB domain, assuming Q meas,s The calculation of ' requires the RSRP measurement values ​​of data beam 1 and data beam 2, so Q meas,s 'Can satisfy: Q meas,s '=[(Q1 meas,s +P1 trafficbeamoffset )+(Q2 meas,s +P2 trafficbeamoffset )] / 2, where Q1 meas,s is the RSRP measurement value of data beam 1, P1 trafficbeamoffset is the EIRP bias of data beam 1, Q2 meas,s is the RSRP measurement value of data beam 2, P2 trafficbeamoffset is the EIRP offset of data beam 2. Similarly, Q meas,n The calculation of ' can also be obtained by averaging the RSRP measurement values ​​of multiple data beams, where the RSRP measurement value of each data beam needs to be determined by the corresponding EIRP offset.

[0171] Optionally, in some feasible implementations, since the coverage range of the coexistence type data beam and the coverage range of the non-coexistence type data beam can provide different service qualities, the associated reselection priorities may also be different. Adding an indication of the beam-associated reselection priority and / or reselection start threshold in the system information can take into account the terminal's reselection performance and reselection measurement overhead. Specifically, when the system information includes the data beam-associated reselection priority and / or reselection start threshold, the terminal can perform cell reselection based on the EIRP bias of the first data beam and the reselection priority and / or reselection start threshold associated with the first data beam. For example, for the cell corresponding to the coexistence type data beam, an equal or higher inter-frequency neighboring cell reselection priority and / or a higher same-frequency reselection start threshold can be indicated. This is beneficial when the coverage area service capability of the coexistence type data beam is limited (i.e., the service quality is poor), so that the terminal can more flexibly select a better NTN cell or TN cell to reside in. For cells corresponding to non-coexistence type data beams, the restrictions on satellites can be reduced so that satellites can provide better services, such as indicating a lower priority for reselection of inter-frequency neighboring cells and / or a lower threshold for starting intra-frequency reselection. This helps reduce the measurement overhead of the terminal (i.e., reducing the number of RRM measurements).

[0172] In an embodiment of the present application, by indicating the EIRP bias of the data beam in the system information (for example, the EIRP bias of the data beam can be the difference between the broadcast beam EIRP and the data beam EIRP), and introducing the EIRP bias into the modified S criterion, the terminal can more accurately calculate the quality of service that the cell corresponding to the data beam can provide at the terminal's location in the NTN and TN coexistence scenario, helping the terminal to perform more accurate cell selection. Similarly, by introducing the influence of the EIRP bias of the data beam into the R criterion, the terminal can more accurately determine the reselected cell.

[0173] Optionally, in some feasible implementations, the system information may not indicate the EIRP bias, but may update the values ​​of higher-layer parameters involved in the S criterion or R criterion indicated by the system information, and the updated values ​​of the higher-layer parameters take into account the influence of the EIRP bias.

[0174] For example, taking the S criterion as an example, if a terminal wants to camp on a certain cell, the cell must meet the following conditions:

[0175] Srxlev>0 and Squal>0;

[0176] Srxlev=Q rxlevmeas -(Q rxlevmin +Q rxlevminoffset )-P compensation -Qoffsettemp ;

[0177] Squal=Q qualmeas -(Q qualmin +Q qualminoffset )-Qoffset temp ;

[0178] Among them, Srxlev is the cell selection reception level value, Squal is the cell selection signal quality value, Q rxlevmeas is the cell receiving level value actually measured by the terminal, Q rxlevmin is the minimum receiving level required to stay in the cell, Q rxlevminoffset Q rxlevmin The offset / bias, P compensation is the power compensation value, Qoffset temp is the temporary offset / bias of the cell, Q qualmeas is the measured cell signal quality value, Q qualmin is the minimum quality value required for the cell, Q qualminoffset Q qualmin In the above formula, except for Q rxlevmeas and Q qualmeas ,The remaining variables are high-level parameters, which are configured through system information, and the values ​​of one or more of these high-level parameters are related to the EIRP bias.

[0179] For another example, taking the R criterion as an example, the R value calculation formula is as follows:

[0180] R s =Q meas,s +Q hyst -Qoffset temp ;

[0181] R n =Q meas,n -Qoffset-Qoffset temp ;

[0182] Among them, R s is the R value of the serving cell, Q meas,s is the RSRP measurement value of the serving cell used for cell reselection, Q hyst is the cell reselection hysteresis value, Qoffset temp It is the temporary offset of the cell. n is the R value of the neighboring area, Q meas,n is the RSRP measurement value of the neighboring cell used for cell reselection, and Qoffset is the neighboring cell reselection offset. hyst , Qoffset temp, Qoffset are all high-level parameters. Through system information configuration, the values ​​of one or more of these high-level parameters are related to the EIRP offset.

[0183] The following will be combined Figures 4 and 5 The communication device provided in this application is described in detail.

[0184] It is understood that in order to implement the functions in the above embodiments, the communication device includes hardware structures and / or software modules corresponding to the execution of each function. It should be readily apparent to those skilled in the art that, in combination with the units and method steps of each example described in the embodiments disclosed in this application, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in hardware or in a manner driven by computer software depends on the specific application scenario and design constraints of the technical solution.

[0185] Figure 4 and Figure 5 Schematic diagram of the structure of possible communication devices provided by the embodiments of the present application. These communication devices can be used to implement the functions of the terminal or satellite in the above method embodiments, and thus can also achieve the beneficial effects possessed by the above method embodiments. In the embodiments of the present application, the communication device can be as follows Figure 1 One of the terminals 120a-120j shown, or alternatively, Figure 1 The RAN node 110a or 110b shown in FIG. Alternatively, it may be a module (such as a chip) applied to a terminal or a satellite.

[0186] like Figure 4 As shown, the communication device 400 includes a processing unit 410 and a transceiver unit 420. The communication device 400 is used to implement the above Figure 3 The method embodiments shown in FIG.

[0187] In one implementation, when the communication device 400 is used to implement Figure 3 The functions of the terminal in the method embodiment shown are:

[0188] The transceiver unit 420 is used to receive system information from a satellite, where the system information includes an effective isotropic radiated power (EIRP) bias of one or more data beams, and the coverage of the satellite's broadcast beam includes the coverage of the one or more data beams; the processing unit 410 is used to determine the EIRP bias of a first data beam associated with the terminal's geographic location based on the system information, where the one or more data beams include the first data beam; the processing unit 410 is used to perform cell selection or cell reselection based on the EIRP bias of the first data beam.

[0189] When the communication device 400 is used to implement Figure 3 The functions of the satellite in the method embodiment shown are:

[0190] The processing unit 410 is used to determine system information, where the system information includes the effective isotropic radiated power (EIRP) bias of one or more data beams, and the coverage range of the satellite's broadcast beam includes the coverage range of the one or more data beams; the transceiver unit 420 is used to send the system information.

[0191] For more detailed description of the processing unit 410 and the transceiver unit 420, please refer to Figure 3 The method embodiment shown is described in detail.

[0192] like Figure 5 As shown, communication device 500 includes a processor 510 and an interface circuit 520. Processor 510 and interface circuit 520 are coupled to each other. It is understood that interface circuit 520 can be a transceiver or an input / output interface. Optionally, communication device 500 may also include a memory 530 for storing instructions executed by processor 510, input data required by processor 510 to execute instructions, or data generated after processor 510 executes instructions.

[0193] When the communication device 500 is used to implement Figure 3 When the method is shown, the processor 510 is used to implement the functions of the processing unit 410, and the interface circuit 520 is used to implement the functions of the transceiver unit 420.

[0194] When the communication device is a chip used in a terminal, the terminal chip implements the terminal functions in the above method embodiments. The terminal chip receives information sent by the satellite to the terminal through other modules in the terminal (such as a radio frequency module or antenna); or the terminal chip sends information to other modules in the terminal (such as a radio frequency module or antenna), and the information is sent by the terminal to the satellite.

[0195] When the above-mentioned communication device is a module applied to a satellite, the satellite module implements the functions of the satellite in the above-mentioned method embodiment. The satellite module receives information from other modules in the satellite (such as a radio frequency module or antenna), and the information is sent by the terminal to the satellite; or the satellite module sends information to other modules in the satellite (such as a radio frequency module or antenna), and the information is sent by the satellite to the terminal. The satellite module here can be a baseband chip of the satellite, or a CU, DU or other module, or a device under the open radio access network (O-RAN) architecture, such as an open CU, open DU, etc.

[0196] It is understood that the processor in the embodiments of the present application may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0197] The method steps in the embodiments of the present application can be implemented in hardware or in software instructions that can be executed by a processor. The software instructions can be composed of corresponding software modules, which can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, registers, hard disk, mobile hard disk, CD-ROM or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. The storage medium can also be an integral part of the processor. The processor and storage medium can be located in an ASIC. In addition, the ASIC can be located in a satellite or terminal. The processor and storage medium can also exist in a satellite or terminal as discrete components.

[0198] In the above embodiments, all or part of the embodiments may be implemented using software, hardware, firmware, or any combination thereof. When implemented using software, all or part of the embodiments may be implemented in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, or other programmable device. The computer program or instructions may be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer program or instructions may be transferred from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means. 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 that integrates one or more available media. The available medium may be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; an optical medium, such as a digital video disk; or a semiconductor medium, such as a solid-state drive. The computer-readable storage medium may be a volatile or nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.

[0199] In the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0200] It is understood that the various numbers used in the embodiments of this application are merely for ease of description and are not intended to limit the scope of the embodiments of this application. The order of the sequence numbers of the above-mentioned processes does not necessarily imply a specific order of execution; the order of execution of the processes should be determined by their functions and inherent logic.

Claims

1. A communication method, characterized in that: include: receiving system information from a satellite, where the system information includes effective isotropically radiated power (EIRP) offsets of one or more data beams, and a coverage range of a broadcast beam of the satellite includes a coverage range of the one or more data beams; Determine, according to the system information, an EIRP offset of a first data beam associated with a geographical location of the terminal, where the one or more data beams include the first data beam; Cell selection or cell reselection is performed according to the EIRP offset of the first data beam.

2. The method according to claim 1, characterized in that The system information also includes a beam type of a data beam, and the EIRP offset of the first data beam is an EIRP offset corresponding to the beam type of the first data beam.

3. The method according to claim 2, characterized in that The EIRP bias corresponding to the beam type of the first data beam is determined based on the EIRP corresponding to the beam type of the first data beam and a preset EIRP, or the EIRP bias corresponding to the beam type of the first data beam is determined based on the EIRP density corresponding to the beam type of the first data beam and a preset EIRP density.

4. The method according to claim 1, wherein The EIRP offset of the first data beam is determined based on the EIRP corresponding to the first data beam and a preset EIRP, or the EIRP offset of the first data beam is determined based on the EIRP density corresponding to the first data beam and a preset EIRP density.

5. The method according to claim 3 or 4, characterized in that The preset EIRP is the EIRP of the broadcast beam corresponding to the first data beam, and / or the preset EIRP is the EIRP of a non-coexistence type data beam; or the preset EIRP density is the EIRP density of the broadcast beam corresponding to the first data beam, and / or the preset EIRP density is the EIRP density of a non-coexistence type data beam; In which, the coverage range of the non-coexistence type data beam does not overlap with the service area of ​​the ground network device, and / or the interval between the working frequency band of the non-coexistence type data beam and the working frequency band of the ground network device is greater than a first threshold.

6. The method according to any one of claims 1 to 5, characterized in that The system information includes a synchronization signal block SSB, and the EIRP offset of the data beam of the non-coexistence type among the multiple data beams is carried in the SSB.

7. The method according to any one of claims 1 to 6, characterized in that The system information includes a system information block SIB, and the EIRP offset of a data beam of a coexistence type among the multiple data beams is carried in the SIB; In which, the coverage range of the coexistence type data beam overlaps with the service area of ​​the ground network device, and the interval between the working frequency band of the coexistence type data beam and the working frequency band of the ground network device is less than or equal to the first threshold or the working frequency band of the coexistence type data beam overlaps with the working frequency band of the ground network device.

8. The method according to claim 7, characterized in that The SIB also includes the coverage of the data beam.

9. The method according to any one of claims 1 to 8, characterized in that The performing cell selection according to the EIRP bias of the first data beam includes: Determine a cell selection reception level value and a cell selection signal quality value of a serving cell according to the EIRP offset of the first data beam, and determine a cell selection reception level value and a cell selection signal quality value of a neighboring cell according to the EIRP offset of at least one second data beam; The cell selection received power value and the cell selection signal quality value are used for cell selection, and the coverage range of the at least one second data beam overlaps or is adjacent to the coverage range of the first data beam.

10. The method according to claim 9, characterized in that The cell selection reception level value Srxlev of the serving cell satisfies: Srxlev=Q rxlevmeas ’-(Q rxlevmin +Q rxlevminoffset )-P compensation -Qoffset temp ; Among them, the Q rxlevmeas ' is the reference signal received power RSRP predicted value of the first data beam, the Q rxlevmeas 'Based on Q rxlevmeas and P trafficbeamoffset OK, the Q rxlevmeas is the RSRP measurement value of the broadcast beam corresponding to the first data beam, the P trafficbeamoffset is the EIRP bias of the first data beam; the Q rxlevmin is the minimum receiving power requirement of the cell, the Q rxlevminoffset For the Q rxlevmin Bias, the P compensation is the power compensation value, the Qoffset temp Temporary offset for the cell.

11. The method according to claim 9 or 10, characterized in that The cell selection signal quality value Squal of the serving cell satisfies: Squal=Q qualmeas ’-(Q qualmin +Q qualminoffset )-Qoffset temp ; Among them, the Q qualmeas ' is the reference signal received quality RSRQ predicted value of the first data beam, the Q qualmeas 'Based on Q rxlevmeas 'OK, the Q rxlevmeas ' is the RSRP prediction value of the first data beam; the Q qualmin is the minimum quality value required for the cell, the Q qualminoffset For the Q qualmin offset, the Qoffset temp Temporary offset for the cell.

12. The method according to any one of claims 1 to 8, characterized in that The performing cell reselection according to the EIRP offset of the first data beam includes: Determine the R of the serving cell according to the EIRP bias of the first data beam s value, and determining the R of the neighboring cell according to the EIRP bias of at least one second data beam n value; Among them, the R s value and the R n The value is used for cell reselection, and the coverage range of the at least one second data beam overlaps or is adjacent to the coverage range of the first data beam.

13. The method according to claim 12, characterized in that The R of the serving cell s The value satisfies: R s =Q meas,s ’+Q hyst -Qoffset temp ; Among them, the Q meas,s ' is the RSRP prediction value of the serving cell for cell reselection after optimization, the Q meas,s 'Based on Q meas,s and P trafficbeamoffset OK, the Q meas,s is the RSRP measurement value of the serving cell used for cell reselection, the P trafficbeamoffset is the EIRP offset of the first data beam, the Qoffset temp Temporary offset for the cell.

14. The method according to claim 12 or 13, characterized in that The system information further includes one or more of the following information: a reselection priority associated with the data beam, or a reselection start threshold; The performing cell reselection according to the EIRP offset of the first data beam includes: Cell reselection is performed according to the EIRP bias of the first data beam, and the reselection priority and / or reselection start threshold associated with the first data beam.

15. A communication method, characterized in that: include: Determining system information, where the system information includes effective isotropically radiated power (EIRP) offsets of one or more data beams, and a coverage range of the satellite's broadcast beam includes a coverage range of the one or more data beams; The system information is sent.

16. The method according to claim 15, characterized in that The system information also includes the beam type of the data beam.

17. The method according to claim 15 or 16, characterized in that The system information includes a synchronization signal block SSB, and the EIRP offset of the data beam of the non-coexistence type among the multiple data beams is carried in the SSB.

18. The method according to any one of claims 15 to 17, characterized in that: The system information includes a system information block SIB, and the EIRP offset of a data beam of a coexistence type among the multiple data beams is carried in the SIB; In which, the coverage range of the coexistence type data beam overlaps with the service area of ​​the ground network device, and the interval between the working frequency band of the coexistence type data beam and the working frequency band of the ground network device is less than or equal to the first threshold or the working frequency band of the coexistence type data beam overlaps with the working frequency band of the ground network device.

19. The method according to claim 18, characterized in that The SIB also includes the coverage of the data beam.

20. A communication device, characterized in that: The method comprises a unit or module for executing the method according to any one of claims 1 to 14, or comprises a unit or module for executing the method according to any one of claims 15 to 19.

21. A communication device, characterized in that: The device comprises a processor and an interface circuit, wherein the interface circuit is used to receive signals from other communication devices outside the communication device and transmit them to the processor or send signals from the processor to other communication devices outside the communication device, and the processor is used to implement the method according to any one of claims 1 to 14 through a logic circuit or by executing code instructions, or to implement the method according to any one of claims 15 to 19.

22. A computer-readable storage medium, characterized in that The storage medium stores a computer program or instruction. When the computer program or instruction is executed by the communication device, the method according to any one of claims 1 to 14 is implemented, or the method according to any one of claims 15 to 19 is implemented.

23. A computer program product, characterized in that The method comprises a computer program code, and when the computer program code is run on a computer, the method is implemented as claimed in any one of claims 1 to 14, or the method is implemented as claimed in any one of claims 15 to 19.

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