Cell selection method and device

Abstract

The embodiment of the invention provides a cell selection method and device. The method comprises the following steps: the communication device acquires polarization priority information of one or more cells, performs cell measurement on the one or more cells according to the acquired polarization priority information when a cell measurement condition is satisfied, and determines a resident cell according to a measurement result of the one or more cells. According to the technical scheme provided by the invention, the dimension of the polarization direction is added in the cell selection, so that the existing cell selection strategy is optimized, and the terminal can be ensured to determine a more suitable resident cell.

Description

[0001] This application is a divisional application of the application with the application number 202010631577.8 and the invention title "A Cell Selection Method and Device", which was filed on July 3, 2020. Technical Field

[0002] This application relates to the field of communication technologies, and in particular, to a cell selection method and device. Background Art

[0003] Non-terrestrial networks (NTN) such as satellite communication have significant advantages such as global coverage, long-distance transmission, flexible networking, convenient deployment, and being unrestricted by geographical conditions. They can provide services for both fixed terminals and various mobile terminals. Since traditional terrestrial networks cannot provide seamless coverage, especially in places such as the sea, desert, and air where base stations cannot be deployed, non-terrestrial networks are introduced into communication networks such as the fifth generation (5G) mobile communication system. It provides seamless coverage for terminal devices by deploying base stations or some base station functions on high-altitude platforms or satellites, and high-altitude platforms or satellites are less affected by natural disasters, which can improve the reliability of the 5G system.

[0004] In a non-terrestrial network based on satellite deployment, the satellite covers the ground through different beams to form satellite cells. At the same moment, a certain terminal device can be covered by multiple satellite cells. At this time, the terminal device needs to camp on a certain cell through cell selection or cell reselection.

[0005] However, a large number of tests and practices have found that based on the traditional satellite cell selection or reselection mechanism (wherein, the traditional satellite cell reselection mechanism is basically the same as the cell selection or cell reselection mechanism of the 5G network), it is often difficult for terminal devices to camp on a suitable cell. Summary of the Invention

[0006] Embodiments of this application provide a cell selection method and device to ensure that a terminal device determines a more suitable camping cell, achieve load balancing, and thus ensure better communication effects.

[0007] In a first aspect, this application provides a cell selection method, which may include: a communication device obtains polarization priority information of one or more cells; when cell measurement conditions are met, performs cell measurement on the one or more cells according to the polarization priority information; and determines a camping cell according to the measurement results of the one or more cells.

[0008] In the cell selection method provided in the first aspect of this application, the communication device performs cell measurement according to the obtained polarization priority information of the cell to determine the resident cell, that is, the polarization priority is considered in the cell selection or reselection decision, adding the dimension of the polarization direction, optimizing the existing cell selection strategy, and ensuring that the communication device determines a more suitable resident cell.

[0009] In a possible implementation, the cell measurement conditions include one or more of the following: the communication device is in an initial access state or a connected state; or, there is a neighboring cell with a cell priority higher than that of the serving cell of the communication device; the serving cell of the communication device meets the cell measurement start threshold.

[0010] Among them, the initial access state refers to the state where the communication device has just powered on and has not yet camped on a cell; when the communication device is in the idle state or the inactive state, the cell measurement conditions are related to the cell priority of the neighboring cell and the signal quality of the current serving cell; when the communication device is in the connected state, the terminal continuously performs measurements.

[0011] In a possible implementation, performing cell measurement according to the polarization priority information includes: the polarization priority information is used to indicate the priorities of the two polarization directions corresponding to the cell; the communication device selects the polarization direction with a higher priority according to the polarization priority information for cell measurement.

[0012] After the communication device obtains the polarization priority information, it performs cell measurement in the polarization direction with a higher priority to obtain a measurement result. It should be noted that the polarization priority information of the cell is determined by the load, power consumption, etc. on different polarization directions in the cell. Selecting the polarization direction with a higher priority for measurement and selecting the resident cell can achieve load balancing on different polarization directions.

[0013] In a possible implementation, determining the resident cell according to the measurement results of one or more cells includes: the communication device obtains the set of cell measurement parameters of the one or more cells; and determines the resident cell according to the measurement results of the one or more cells and the set of cell measurement parameters of the one or more cells.

[0014] The set of cell measurement parameters includes parameters such as R-criterion calculation parameters, thresholds for high cell priorities, and thresholds for low cell priorities. The set of cell measurement parameters is determined by the cell according to cell load, consumption, throughput, etc. The measurement result of the cell is related to the polarization priority, and the polarization priority is determined by the load, consumption, etc. on different polarization directions in the cell. Combining the cell measurement result and the set of cell measurement parameters to determine the resident cell can select a more suitable resident cell and polarization direction from different neighboring cells, achieving load balancing.

[0015] In a possible implementation, determining a resident cell based on measurement results of one or more cells and a set of cell measurement parameters of the one or more cells includes: obtaining an R value of each cell according to the measurement result of each cell in the one or more cells and the set of cell measurement parameters corresponding to each cell; and determining the resident cell according to the magnitudes of the R values of the one or more cells.

[0016] For cells with the same cell priority, the R criterion is used to determine the resident cell. The larger the R value, the higher the signal quality within the cell. Through the above criterion, a neighboring cell with better communication quality than the current serving cell can be selected as the resident cell.

[0017] In a possible implementation, the R value of the resident cell is greater than or equal to the R value of the serving cell.

[0018] The larger the R value, the higher the signal quality within the cell. By ensuring that the R value of the resident cell is greater than or equal to the R value of the serving cell, the terminal can be made to reside in a cell with higher signal reception power and / or signal quality, thereby providing communication quality.

[0019] In a possible implementation, selecting a resident cell according to the magnitudes of the R values of the one or more cells includes: selecting the cell with the highest R value as the resident cell.

[0020] After considering the polarization direction priority during cell measurement, selecting the cell with the highest R value as the resident cell can make the terminal reside in a more suitable cell and ensure load balancing in different polarization directions.

[0021] In a possible implementation, the communication device obtains polarization priority information of one or more cells from a broadcast message; or the communication device obtains polarization priority information of one or more cells from a unicast message. Specifically, when the communication device is in the idle state or the inactive state, it obtains polarization priority information from the broadcast message; when the communication device is in the connected state, it obtains polarization priority information from a unicast message, that is, a user-specific (UE-specific) message.

[0022] In a possible implementation, the polarization priority information is carried in the system information block SIB.

[0023] In the existing protocol, parameters such as cell priority information and the set of cell measurement parameters are carried in the SIB and broadcast to the communication device. Therefore, carrying the polarization priority information in the SIB is easy to be compatible with the existing protocol, and only simple modifications to the existing signaling are required.

[0024] In a possible implementation, the polarization priority information is used to indicate the polarization direction with a higher priority. Specifically, the polarization priority information includes an identifier corresponding to left-handed polarization or an identifier corresponding to right-handed polarization.

[0025] For example, if the priority corresponding to RHCP is higher, the cellReselectionRHCPPriority or other identifiers corresponding to RHCP are carried in the system message. For example, the network device and the communication device can pre-agree to use "1" to represent RHCP, and then "1" is carried. Through the above method, the polarization priority can be represented by only 1 bit, which can save bit overhead.

[0026] In a second aspect, the present application provides a cell selection method, including: a network device sends a first message to a communication device, and the first message includes polarization priority information, where the polarization priority information is used to measure a cell to obtain a cell measurement result when the cell measurement condition is satisfied, and the cell measurement result is used to select a resident cell of the communication device.

[0027] In the cell selection method provided in the second aspect of the present application, the network device sends a broadcast message carrying polarization priority information to the communication device, so that the communication device performs small measurements according to the polarization priority information to determine a resident cell. That is, the dimension of the polarization direction is added to the cell selection or reselection strategy, optimizing the existing cell selection strategy and ensuring that the communication device can determine a more suitable resident cell.

[0028] In a possible implementation, the polarization priority information is used for cell measurement to obtain a cell measurement result, specifically including: the polarization priority information is used to indicate the priorities of two polarization directions corresponding to the cell, and the polarization direction with a higher priority is used for cell measurement.

[0029] It should be noted that the polarization priority information of the cell is determined by the load, power consumption, etc. on different polarization directions in the cell. By selecting the polarization direction with a higher priority for cell measurement and selecting a resident cell, load balancing on different polarization directions can be achieved.

[0030] In a possible implementation, the first message further includes a set of cell measurement parameters; the set of cell measurement parameters is used to jointly determine the resident cell of the terminal device with the cell measurement result.

[0031] The set of cell measurement parameters includes parameters such as R-criterion calculation parameters, thresholds for high cell priorities, and thresholds for low cell priorities. The set of cell measurement parameters is determined by the cell according to cell load, consumption, throughput, etc. The cell measurement result is related to the polarization priority, and the polarization priority is determined by the load, consumption, etc. on different polarization directions in the cell. Combining the cell measurement result and the set of cell measurement parameters to determine the resident cell can select a more suitable resident cell and polarization direction from different neighboring cells, achieving load balancing.

[0032] In a possible implementation, the cell measurement parameter set is used to determine the resident cell of the terminal device together with the cell measurement result, including: the cell measurement parameter set and the cell measurement result are specifically used to obtain an R value, and this R value is used to select the resident cell of the communication device.

[0033] For cells with the same cell priority, the R criterion is used to determine the resident cell. The larger the R value, the higher the signal quality in the cell. By obtaining the R value according to the R-criterion calculation parameters included in the cell measurement parameter set and the cell measurement result and searching for the resident cell, a neighboring cell with better communication quality than the current serving cell can be selected as the resident cell.

[0034] In a possible implementation, the first message is a broadcast message; or the first message is a unicast message. When the terminal is in the idle state or the inactive state, the first message sent by the network device is a broadcast message; when the terminal is in the connected state, the first message sent by the network device is a unicast message, that is, a UE-specific message.

[0035] In a possible implementation, the polarization priority information is carried in the system information block SIB.

[0036] In the existing protocol, parameters such as cell priority information and the cell measurement parameter set are all carried in the SIB and broadcast to the communication device. Therefore, carrying the polarization priority information in the SIB is easy to be compatible with the existing protocol, and only simple modifications to the existing signaling are required.

[0037] In a possible implementation, the polarization priority information is used to indicate the polarization direction with a higher priority. Specifically, this polarization priority information includes an identifier corresponding to left-handed circular polarization or an identifier corresponding to right-handed circular polarization.

[0038] For example, if the priority corresponding to LHCP is higher, then cellReselectionLHCPPriority or other identifiers corresponding to LHCP are carried in the system message. For example, the network device and the communication device can pre-agree to use "0" to represent LHCP, and then carry "0". Through the above method, the polarization priority can be represented by only 1 bit, which can save bit overhead.

[0039] In a third aspect, an embodiment of the present application further provides a communication device, which can be used for the communication device described in the first aspect. The communication device can be a terminal device, or a device in the terminal device (for example, a chip, or a chip system, or a circuit), or a device that can be used in combination with the terminal device. In a possible implementation, the communication device may include modules or units corresponding one by one to the methods / operations / steps / actions described in the first aspect. The module or unit can be a hardware circuit, software, or a combination of hardware circuit and software. In a possible implementation, the communication device may include a processing unit and a transceiver unit. The processing unit can be used to call the transceiver unit to perform the functions of receiving and / or sending. Exemplarily:

[0040] The transceiver unit is used to obtain polarization priority information of one or more cells, and the processing unit is used to perform cell measurement on the one or more cells according to the polarization priority information when the cell measurement conditions are met, and determine the resident cell according to the measurement results of the one or more cells.

[0041] In a possible implementation, the cell measurement conditions include one or more of the following: the communication device is in an initial access state or a connected state; or, there is an adjacent cell whose cell priority is higher than that of the serving cell of the communication device; or the serving cell of the communication device meets the cell measurement start threshold.

[0042] In a possible implementation, the processing unit is used to perform cell measurement according to the polarization priority information, including: the polarization priority information is used to indicate the priority of two polarization directions corresponding to the cell, and the processing unit is specifically used to select the polarization direction with a higher priority for cell measurement according to the polarization priority information.

[0043] In a possible implementation, the processing unit is used to determine the resident cell according to the measurement results of the one or more cells, including: the processing unit is further used to obtain the set of cell measurement parameters of the one or more cells; and determine the resident cell according to the measurement results of the one or more cells and the set of cell measurement parameters of the one or more cells.

[0044] In a possible implementation, the processing unit is used to determine the resident cell according to the measurement results of the one or more cells and the set of cell measurement parameters of the one or more cells, including: the processing unit is specifically used to obtain the R value of each cell according to the measurement result of each cell in the one or more cells and the set of cell measurement parameters corresponding to each cell; and determine the resident cell according to the magnitudes of the R values of the one or more cells.

[0045] In a possible implementation, the R value of the resident cell is greater than or equal to the R value of the serving cell.

[0046] In a possible implementation, the processing unit is configured to select a resident cell according to the magnitudes of the R values of the one or more cells, including: specifically, the processing unit is configured to select the cell with the highest R value as the resident cell.

[0047] In a possible implementation, the processing unit obtains polarization priority information of one or more cells from a broadcast message; or the processing unit obtains polarization priority information of one or more cells from a unicast message.

[0048] In a possible implementation, the polarization priority information is carried in a System Information Block (SIB).

[0049] In a possible implementation, the polarization priority information is used to indicate a polarization direction with a higher priority. Specifically, the polarization priority information includes an identifier corresponding to left-handed polarization or an identifier corresponding to right-handed polarization.

[0050] It should be noted that for the beneficial effects of the various implementation manners of the communication device provided in the third aspect of the embodiments of the present application, please refer to the beneficial effects of the cell selection method described in the first aspect, which will not be elaborated here.

[0051] Fourthly, an embodiment of the present application further provides a communication device. This communication device can be used for the network device described in the second aspect. This communication device can be a network device, or a device in a network device (for example, a chip, or a chip system, or a circuit), or a device that can be used in combination with a network device. In a possible implementation, this communication device may include modules or units corresponding one by one to the methods / operations / steps / actions described in the second aspect. The module or unit can be a hardware circuit, or software, or a combination of a hardware circuit and software. In a possible implementation, this communication device may include a processing unit and a transceiver unit. The processing unit is configured to call the transceiver unit to perform receiving and / or sending functions. Exemplarily:

[0052] The processing unit is configured to determine polarization priority information; the transceiver unit is configured to send a first message to the communication device, where the first message includes the polarization priority information; the polarization priority information is used to measure a cell to obtain a cell measurement result when cell measurement conditions are met; the cell measurement result is used to select a resident cell of the communication device.

[0053] In a possible implementation, the polarization priority information is used for cell measurement to obtain a cell measurement result, specifically including: the polarization priority information is used to indicate the priorities of two polarization directions corresponding to a cell; the polarization direction with a higher priority is used for cell measurement.

[0054] In a possible implementation, the first message further includes a set of cell measurement parameters; the set of cell measurement parameters is used to determine the resident cell of the terminal device together with the cell measurement result.

[0055] In a possible implementation, the set of cell measurement parameters is used to determine the resident cell of the terminal device together with the cell measurement result, including: the set of cell measurement parameters and the cell measurement result are specifically used to obtain an R value; the R value is used to select the resident cell of the terminal device.

[0056] In a possible implementation, the first message is a broadcast message; or the first message is a unicast message.

[0057] In a possible implementation, the polarization priority information is carried in the System Information Block (SIB).

[0058] In a possible implementation, the polarization priority information is used to indicate the polarization direction with a higher priority. Specifically, the polarization priority information includes an identifier corresponding to left-handed polarization or an identifier corresponding to right-handed polarization.

[0059] It should be noted that for the beneficial effects of various implementation manners of the communication device provided in the fourth aspect of the embodiments of the present application, please refer to the beneficial effects of the cell selection method described in the fourth aspect, which will not be elaborated here.

[0060] Fifth aspect, the embodiments of the present application further provide a communication device, including a processor, configured to execute a computer program or executable instructions stored in a memory. When the computer program or executable instructions are executed, the device is caused to execute the methods in the first aspect and all possible implementations of the first aspect.

[0061] In a possible implementation, the processor and the memory are integrated together;

[0062] In another possible implementation, the memory is located outside the communication device.

[0063] The communication device further includes a communication interface, which is used for the communication device to communicate with other devices, such as sending or receiving data and / or signals. Exemplarily, the communication interface can be a transceiver, a circuit, a bus, a module or other types of communication interfaces.

[0064] Sixth aspect, the embodiments of the present application further provide a communication device, including a processor, configured to execute a computer program or executable instructions stored in a memory. When the computer program or executable instructions are executed, the device is caused to execute the methods in the second aspect and all possible implementations of the second aspect.

[0065] In a possible implementation, the processor and the memory are integrated together;

[0066] In another possible implementation, the memory is located outside the communication device.

[0067] The communication device further includes a communication interface, which is used for the communication device to communicate with other devices, such as sending or receiving data and / or signals. Exemplarily, the communication interface can be a transceiver, a circuit, a bus, a module, or other types of communication interfaces.

[0068] In a seventh aspect, an embodiment of the present application further provides a communication device, including an input / output interface and a logic circuit. The input / output interface is used for inputting or outputting signals or data. Specifically, the input / output interface is used to obtain polarization priority information of one or more cells; the input / output interface is further used to output the measurement results of the one or more cells. The logic circuit is used to execute the method in the first aspect and any of its possible implementations above to determine the resident cell.

[0069] In an eighth aspect, an embodiment of the present application further provides a communication device, including an input / output interface and a logic circuit. The logic circuit is used to execute the method in the second aspect and any of its possible implementations above to determine a first message, and the polarization priority information is carried in the first message. The input / output interface is used to output the first message, and the first message includes polarization priority information. The input / output interface is further used to obtain cell measurement results.

[0070] In a ninth aspect, an embodiment of the present application further provides a computer-readable storage medium, which stores a computer program. Wherein, when the computer program is executed by a processor, some or all of the steps of the methods in the first aspect and any of its possible implementations, and the second aspect and any of its possible implementations above are executed.

[0071] In a tenth aspect, an embodiment of the present application further provides a computer program product including executable instructions. When the computer program product runs on a user device, some or all of the steps of the methods in the first aspect and any of its possible implementations, and the second aspect and any of its possible implementations above are executed.

[0072] In an eleventh aspect, an embodiment of the present application further provides a chip system, which includes a processor and may further include a memory, and is used to implement the methods in the first aspect and any of its possible implementations, and the second aspect and any of its possible implementations above. The chip system can be composed of chips or can include chips and other discrete devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] Some drawings related to the embodiments of the present application will be described below.

[0074] Figure 1 It is a schematic diagram of a communication system provided by an embodiment of the present application.

[0075] Figure 2 It is an application scenario diagram provided by an embodiment of the present application.

[0076] Figure 3 It is a schematic flow diagram of a cell selection method provided by an embodiment of the present application.

[0077] Figure 4A It is a schematic signaling diagram of a system message SIB2 including polarization priority provided by an embodiment of the present application.

[0078] Figure 4B It is a schematic signaling diagram of a system message SIB3 including polarization priority provided by an embodiment of the present application.

[0079] Figure 4C It is a schematic signaling diagram of a system message SIB4 including polarization priority provided by an embodiment of the present application.

[0080] Figure 5 It is an interaction schematic diagram of a cell selection method provided by an embodiment of the present application.

[0081] Figure 6 It is an interaction schematic diagram of a cell handover method provided by an embodiment of the present application.

[0082] Figure 7 It is a schematic structural diagram of a communication device provided by an embodiment of the present application.

[0083] Figure 8 It is a schematic structural diagram of another communication device provided by an embodiment of the present application.

[0084] Figure 9 It is a schematic structural diagram of yet another communication device provided by an embodiment of the present application. Detailed implementation manners

[0085] An embodiment of the present application provides a cell selection method and apparatus to optimize the existing cell selection / cell reselection strategy and determine a more suitable resident cell. Among them, the method and the apparatus are based on the same application concept. Since the principles of the method and the apparatus for solving problems are similar, the implementation of the apparatus and the method can be referred to each other, and the repeated parts will not be described again.

[0086] The embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

[0087] As used herein, the term "and / or" is merely used to describe an associated relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent three cases: A exists alone, both A and B exist simultaneously, and B exists alone. Terms such as "first" and "second" in the specification and claims of the embodiments of the present application are used to distinguish different objects, rather than to describe a specific order of the objects. For example, the first network device and the second network device are used to distinguish different network devices, rather than to describe a specific order of the target objects. In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "a plurality of" refers to two or more. For example, a plurality of processing units refers to two or more processing units; a plurality of systems refers to two or more systems.

[0088] The technical solution of the present application can be applied to non-terrestrial network (NTN) systems such as satellite communication systems and high altitude platform (HAPS) communication. The satellite communication system can be integrated with traditional mobile communication systems. For example: the mobile communication system can be a fourth-generation (4G) communication system, such as a long term evolution (LTE) system, a worldwide interoperability for microwave access (WiMAX) communication system, a fifth-generation (5G) communication system, such as a new radio (NR) system, and future mobile communication systems, etc.

[0089] See Figure 1 , Figure 1 For an example of a communication system suitable for the embodiments of the present application. As Figure 1, the access point uses multiple beams to cover the service area, and different beams can communicate through one or more of time division, frequency division, and space division. Among them, the access point is not limited to satellite base stations or terrestrial base stations. The access point can be deployed on a high-altitude platform or a satellite. The satellite can be a non-geostationary earth orbit (NGEO) satellite or a geostationary earth orbit (GEO) satellite. The satellite mentioned in the embodiments of the present application can also be a satellite base station or a network-side device carried on the satellite.

[0090] The access point can be an evolved Node B (eNB or eNodeB) in LTE; or a base station in a 5G network or a future evolved public land mobile network (PLMN), a broadband network gateway (BNG), an aggregation switch, or a non-3rd generation partnership project (3GPP) access device, etc. The embodiments of the present application do not make specific limitations on this. Optionally, the base stations in the embodiments of the present application can include various forms of base stations, such as: macro base stations, micro base stations (also called small stations), relay stations, access points, next-generation base stations (gNodeB, gNB), transmitting and receiving points (TRP), transmitting points (TP), mobile switching centers, and devices that undertake the functions of base stations in device-to-device (D2D), vehicle-to-everything (V2X), and machine-to-machine (M2M) communications, etc. The embodiments of the present application do not make specific limitations on this.

[0091] The access point can communicate and interact with core network devices to provide communication services to terminal devices. The core network devices are, for example, devices in the core network (CN) of a 5G network. The core network serves as a bearer network to provide an interface to the data network, and provides communication connections, authentication, management, policy control, and bearer for data services for user equipment (UE). Among them, the CN can further include: Access and Mobility Management Function (AMF), Session Management Function (SMF), Authentication Server Function (AUSF), Policy control Function (PCF), User Plane Function (UPF), and other network elements.

[0092] The communication device mentioned in the embodiments of the present application may be a terminal device, including various handheld devices, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem with wireless communication functions. Specifically, it may refer to a user equipment (UE), an access terminal, a subscriber unit, a user station, a mobile station, a mobile terminal, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent or a user device. The terminal device may also be a satellite phone, a cellular phone, a smart phone, a wireless data card, a wireless modem, a machine type communication device, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication functions, a computing device or other processing devices connected to a wireless modem, a vehicle-mounted device or a wearable device, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, a terminal device in a 5G network or a future communication network, etc. The present application does not make any restrictions.

[0093] See Figure 2 , Figure 2 shows an application scenario applicable to the embodiments of the present application, specifically a network application architecture in which members of 3GPP integrate satellite communication and 5G technology. It should be noted that this application architecture is not a limitation to the present application. The communication method provided by the embodiments of the present application can also be applied to other scenarios where terrestrial communication systems are integrated with satellite communication. The terrestrial mobile terminal accesses the network through the 5G new air interface. The satellite serves as a 5G base station and is connected to the core network on the ground through a wireless link. At the same time, there is a wireless link between satellites to complete signaling interaction and user data transmission between base stations. Figure 2 The various network elements in

[0094] Terminal device: A mobile device that supports the 5G New Radio (NR) air interface, which can access the satellite network through the air interface and initiate services such as calls and Internet access. For example, it can be various terminal devices as described above, which will not be elaborated here.

[0095] 5G base station: It mainly provides wireless access services, schedules wireless resources for access terminals, and provides reliable wireless transmission protocols and data encryption protocols, etc.

[0096] 5G core network: It is responsible for services such as user access control, mobility management, session management, user security authentication, and charging. It consists of multiple functional units and can be divided into control plane and data plane functional entities. The Access and Mobility Management Function (AMF) is responsible for user access management, security authentication, and mobility management. The User Plane Function (UPF) is responsible for managing the transmission of user plane data, traffic statistics, and other functions.

[0097] Ground station: It is responsible for forwarding signaling and service data between the satellite base station and the 5G core network.

[0098] 5G New Radio (NR) air interface: The wireless link between the terminal and the base station.

[0099] Xn interface: The interface between 5G base stations, which is mainly used for signaling interaction such as handover.

[0100] NG interface: The interface between the 5G base station and the 5G core network, which mainly exchanges signaling such as non-access stratum (NAS) signaling of the core network, as well as user service data.

[0101] To facilitate the understanding of the embodiments of the present application, first, the cell selection and cell reselection mechanisms of the traditional terrestrial network are introduced.

[0102] 1) Cell selection

[0103] After the terminal device is powered on, it first selects a suitable Public Land Mobile Network (PLMN) and performs cell selection on this PLMN. Cell selection is divided into two types: initial cell selection and selection based on stored cell information. Cell selection consists of four steps: frequency scanning, cell search, decoding system information, and camping.

[0104] During initial cell selection, frequency scanning is first performed followed by cell search. That is, the terminal scans all radio frequency wireless channels according to the NR frequency bands it supports, and on each frequency point, it searches for the strongest cell. Cell selection based on stored cell information directly performs cell search according to the stored frequency point information. The terminal device obtains the cell with the best coverage through cell search, synchronizes to this cell to obtain the physical cell identifier; after cell search is completed, the terminal device reads the cell system message, measures the signal strength and signal quality of this cell, and determines whether this cell meets the residence conditions.

[0105] The cell residence conditions are judged by the S criterion. Residence is allowed when the S value for cell selection is Srxlev > 0 and Squal > 0.

[0106] Srxlev = Qrxlevmeas – (Qrxlevmin + Qrxlevminoffset) - Pcompensation - Qoffsettemp

[0107] Squal = Qqualmeas – (Qqualmin + Qqualminoffset) – Qoffsettemp

[0108] Among them, Qrxlevmeas is the reference signal received power (RSRP) value of the measured cell;

[0109] Qrxlevmin is the minimum RSRP reception strength requirement in the cell, and this value is obtained from the broadcast message;

[0110] Qrxlevminoffset is the offset value for the minimum access level value to prevent ping-pong reselection;

[0111] Pcompensation is the compensation value = MAX(Pemax - Pumax, 0), that is, the configured value, which is the larger value between the difference between the configured value and the terminal's actual uplink transmission power and 0.

[0112] Qqualmin = q - QualMin(SIB2), where q - QualMin(SIB2) is carried in the system information block (SIB) 2. If q - QualMinOffsetCell is configured in SIB3, then Qqualmin = q - QualMin(SIB2) + q - QualMinOffsetCell(SIB3).

[0113] Qoffsettemp is the temporary offset value, and this value is notified in the system broadcast.

[0114] 2) Cell reselection

[0115] To obtain better network services, the terminal device performs cell reselection in the idle state or the inactive state. Cell reselection is divided into the following steps: (1) Measure the current serving cell and neighboring cells according to the measurement start conditions; (2) Determine whether the neighboring cell meets the reselection criteria; (3) If it meets the criteria, initiate reselection, receive the system message of the new cell, and camp on the new cell if there is no reception limitation; if it does not meet the criteria, stay in the current serving cell.

[0116] The cell measurement start conditions are related to the cell priority and the signal quality of the current serving cell. As shown in Table 1, cell reselection scenarios can be divided into intra-frequency cell reselection and inter-frequency / inter-system cell reselection.

[0117] Table 1

[0118]

[0119] In intra-frequency cell reselection, when the S value of the serving cell is less than or equal to the given threshold S_intrasearch (intra-frequency measurement threshold), intra-frequency measurement needs to be enabled, otherwise the UE can choose to disable the measurement. In an actual network, to save energy consumption, usually when S > S_intrasearch, the UE usually disables the measurement. After obtaining the measurement results, the terminal sorts the candidate cells based on the R criterion and selects the optimal cell to camp on.

[0120] The R criterion is to calculate an R (Rank) value for each neighboring cell and the current serving cell according to the cell signal quality, and then sort according to the R value. Those with an R value greater than the current serving cell meet the reselection criteria. If there are multiple that meet the criteria, select the best one. If it continuously meets the R criterion for more than TreselectionRAT and the terminal has camped on the current serving cell for more than 1 s, then initiate reselection to this cell. Here, TreselectionRAT represents the time interval for cell reselection.

[0121] The R value of the current serving cell can be calculated by the following formula:

[0122] Rs = Qmeas,s + Q hyst –Qoffsettemp

[0123] The R value of the neighboring cell can be calculated by the following formula:

[0124] Rn = Qmeas,n - Qoffset - Qoffsettemp

[0125] Among them, Qmeas,s is the signal quality of the current serving cell, obtained through cell measurement, which can specifically be the RSRP value of the serving cell; Qmeas,n is the signal quality of the neighboring cell, obtained through cell measurement, which can specifically be the RSRP value of the neighboring cell; Q hyst is the reselection hysteresis value of the current serving cell, obtained from the system. The larger this value is, the larger the boundary of the serving cell is, and the more difficult it is to reselect to a neighboring cell; Qoffset is the R-criterion calculation parameter, obtained from the system message. When performing intra-frequency reselection, this value is taken as Qoffset cell , and when performing inter-frequency reselection, this value is taken as Qoffset Cell +Qoffset Freq ; Qoffsettemp is also the R-criterion calculation parameter, obtained from the system message. The values of R-criterion calculation parameters such as Q hyst , Qoffset, and Qoffsettemp are all greater than or equal to zero.

[0126] Inter-frequency / inter-system cell reselection needs to be distinguished according to priorities. Among them, for high-priority cells, the terminal needs to continuously perform measurements, and when the S value of the high-priority cell is greater than the corresponding threshold, it reselects to this cell; for cells with the same or lower priorities, when the S value of the serving cell is greater than the given threshold S_nonintrasearch (inter-frequency / inter-system measurement threshold), intra-frequency measurements need to be started, otherwise the UE can choose to turn off the measurements. After obtaining the measurement results, the terminal selects the optimal cell for residence based on the cell reselection criteria corresponding to different priority relationships. For high-priority cells, within TreselectionRAT, when the S value of the high-priority cell is greater than the preset threshold (Thresh X,HighQ or Thresh X,HighP ), and the terminal has resided in the current serving cell for more than 1 s, then the reselection to this cell is started. For low-priority cells, within TreselectionRAT, when the S value of the serving cell is less than the preset threshold (Thresh Serving,LowQ or Thresh Serving,LowP ), and the S value of the low-priority cell is greater than the preset threshold (Thresh X,LowQ or Thresh X,LowP ), and the terminal has resided in the current serving cell for more than 1 s, then the reselection to this cell is started.

[0127] Different from terrestrial communication systems, satellite communication often adopts polarization multiplexing, such as left-hand circular polarization (LHCP) or right-hand circular polarization (RHCP), or horizontal polarization or vertical polarization, or other orthogonal polarizations. Different satellite cells use different polarization methods for signal transmission to improve spectral efficiency. The loads in different polarization directions of the same satellite may be different.

[0128] If the satellite communication adopts the same cell selection or cell reselection mechanism as the above-mentioned traditional terrestrial network, the terminal may often have difficulty camping on a more suitable cell. To solve the above problems, the present application introduces a polarization multiplexing method in the NTN cell, increasing the physical dimension of cell selection. By indicating the polarization direction, an optimized cell selection strategy is realized. In the cell selection and cell reselection strategies provided by the embodiments of the present application, in addition to cell priority and cell signal quality, the dimension of the polarization direction is also considered, which can comprehensively determine a more suitable camping cell and ensure load balancing in different polarization directions.

[0129] See Figure 3 , Figure 3 FIG. is a schematic flowchart of a cell selection and cell reselection strategy provided by an embodiment of the present application. In this embodiment, the network device broadcasts polarization priority information for the user to refer to the polarization direction when making a decision on cell selection or cell reselection, so as to comprehensively determine a more suitable camping cell.

[0130] First of all, it should be noted that the communication device described in the present application can be various types of terminals mentioned above, and the terminal is used as an example for description hereinafter.

[0131] S301. Obtain polarization priority information.

[0132] The terminal obtains polarization priority information. This polarization priority information is used to indicate the priority of two or more polarization directions corresponding to the cell.

[0133] The network device sends a first message to the terminal, and the polarization priority information is carried in the first message. Correspondingly, the terminal receives the first message sent by the network device.

[0134] Possibly, the first message is a broadcast message; or the first message is a unicast message. Specifically, when the terminal is in the idle state or inactive state, the first message can be a broadcast message; when the terminal is in the connected state, the first message can be a unicast message.

[0135] In a possible implementation, the network device sends the polarization priority information of one or more cells through a first message, and the terminal receives the first message sent by the network device and obtains the polarization priority information from the first message.

[0136] The polarization priority information of one or more cells sent by the network device may include the polarization priority information of the serving cell and the polarization priority information of neighboring cells. Possibly, the polarization priority information is bound to the cell identifier.

[0137] Possibly, the polarization priority information may be carried in the System Information Block (SIB). Considering compatibility with existing protocols, simple modifications can be made to the existing signaling. Taking the system messages SIB2, SIB3, and SIB4 in NR as examples: SIB2 contains cell reselection information related to the serving cell; SIB3 contains information about the serving frequency related to cell reselection and co-frequency neighboring cells; SIB4 contains information about other NR frequencies related to cell reselection and inter-frequency neighboring cells.

[0138] As Figure 4A shown, the priority of two polarization directions can also be carried in the cellReselectionServingFreqInfo sub-item of the cell reselection serving frequency information in SIB2. The priorities corresponding to left-handed circular polarization and right-handed circular polarization are indicated by the cellReselectionLHCPPriority field and the cellReselectionRHCPPriority field respectively (the part marked by the dashed box in the figure).

[0139] As Figure 4B shown, the priority of two polarization directions can be carried in the IntraFreqCellReselectionInfo sub-item of the co-frequency cell reselection information in SIB3. The priorities corresponding to left-handed circular polarization and right-handed circular polarization are indicated by the cellReselectionLHCPPriority field and the cellReselectionRHCPPriority field respectively (the part marked by the dashed box in the figure).

[0140] As Figure 4C shown, the priority of two polarization directions can be carried in the InterFreqCarrierFreqInfo sub-item of the inter-frequency carrier frequency information in SIB4. The priorities corresponding to left-handed circular polarization and right-handed circular polarization are indicated by the cellReselectionLHCPPriority field and the cellReselectionRHCPPriority field respectively (the part marked by the dashed box in the figure).

[0141] In a possible implementation, the system message carries the polarization priority information corresponding to LHCP and RHCP at the same time, and the polarization direction with a higher value is the polarization direction with a higher priority. For example, if cellReselectionLHCPPriority = 0 and cellReselectionRHCPPriority = 1, it means that RHCP is the polarization direction with a higher priority.

[0142] In another possible implementation, the polarization priority information is used to indicate the polarization direction with a higher priority. Specifically, the polarization priority information includes an identifier corresponding to left-handed polarization or an identifier corresponding to right-handed polarization. For example, if the priority corresponding to RHCP is higher, the system message carries cellReselectionRHCPPriority or other identifiers corresponding to RHCP, and does not carry identifiers corresponding to other polarization directions. For another example, the network device and the terminal can pre-agree to use "1" to represent RHCP and "0" to represent LHCP. If the priority corresponding to RHCP is higher, the value of the bit corresponding to the polarization priority is 1. If the priority corresponding to LHCP is higher, the value of the bit corresponding to the polarization priority is 0; it can also use "1" to represent LHCP and "0" to represent LHCP, which is not limited in this application. In this possible implementation, the polarization priority can be represented by only 1 bit, which can reduce the bit overhead.

[0143] It should be noted that the polarization priority information of the cell is determined by the load and power consumption in different polarization directions within the cell, and different manufacturers can use different algorithms to determine the cell priority. For example, if the load in the LHCP direction of a certain cell is large and the load in the RHCP direction is small, then the RHCP with a smaller load is used as the polarization direction with a higher priority, so as to achieve load balancing.

[0144] S302: When the cell measurement condition is satisfied, perform cell measurement according to the polarization priority information.

[0145] Specifically, when the cell measurement condition is satisfied, the terminal selects the polarization direction with a higher polarization priority on the measurement port to perform cell measurement according to the polarization priority information obtained from the first message.

[0146] In a possible implementation, the terminal selects the polarization direction with a higher polarization priority for each cell in one or more cells according to the polarization priority information of one or more cells obtained from the first message to obtain the cell measurement results of one or more cells.

[0147] The cell measurement conditions include one or more of the following: the terminal is in the initial access state or the connected state; or there is a neighboring cell with a cell priority higher than that of the terminal's current serving cell; or the serving cell of the terminal meets the cell measurement start threshold. It should be noted that the initial access state refers to the state where the terminal has just powered on and has not yet camped on a cell. At this time, the terminal performs cell search through frequency scanning or based on the stored cell information, obtains the cell with the best coverage, synchronizes to this cell to obtain the physical cell identifier; after the cell search is completed, the terminal device decodes the cell system message, obtains the polarization priority information of this cell and other cell selection-related parameters, and performs cell measurement according to the polarization priority information.

[0148] When the terminal is in the connected state, it continuously performs cell measurement and periodically reports the measurement results to the network device or reports the measurement results to the network device under event-triggered conditions.

[0149] When the terminal is in the idle state or the inactive state, if there is a neighboring cell with a cell priority higher than that of the current serving cell, measurement is unconditionally started. The cell priority information can be obtained from the system message SIB sent by the current serving cell. For example, the cell priority information can be represented by cellReselectionPriority carried in the SIB message, and the value range is an integer from 0 to 7. The larger the value of this parameter, the higher the cell priority. The cell priority can be determined by cell load, power consumption, etc. Possibly, different manufacturers can use different algorithms to determine the cell priority, and this application does not make any restrictions.

[0150] When the terminal is in the idle state and the cell priority of the neighboring cell is equal to or lower than that of the current serving cell, if the current serving cell meets the cell measurement start threshold, cell measurement is performed. For example, for a same-frequency cell, when the S value of the current serving cell is less than or equal to the same-frequency measurement threshold (S_IntraSearch), the terminal performs cell measurement according to the polarization priority information; for an inter-frequency or inter-system cell, when the S value of the current serving cell is less than or equal to the inter-frequency measurement threshold (S_nonIntraSearch), the terminal performs cell measurement according to the polarization priority information. Specifically, when the neighboring cell is a same-priority same-frequency cell and Srxlev of the current serving cell = <SIntraSearchP and Squal = <SIntraSearchQ, the terminal performs cell measurement according to the polarization priority information; when the neighboring cell is a same-priority inter-frequency / inter-system cell or a low-priority inter-frequency / inter-system cell and Srxlev of the current serving cell = <SnonIntraSearchP and Squal = <SnonIntraSearchQ, the terminal performs cell measurement according to the polarization priority information.

[0151] In a possible implementation, for co-frequency cells, when the S value of the current serving cell is less than the co-frequency measurement threshold (S_IntraSearch), the terminal performs cell measurement according to the polarization priority information, and when the S value of the current serving cell is equal to S_IntraSearch, the terminal does not perform cell measurement; for inter-frequency or inter-system cells, when the S value of the current serving cell is less than the inter-frequency measurement threshold (S_nonIntraSearch), the terminal performs cell measurement according to the polarization priority information, and when the S value of the current serving cell is equal to S_nonIntraSearch, the terminal does not perform cell measurement.

[0152] It should be noted that all boundary cases involved in the embodiments of the present application (for example, the case where the S value is equal to the measurement threshold) can be processed in the above manner. For example, when the S value is in a boundary case, cell measurement may or may not be performed. For the calculation method of the S value, please refer to the previous text and will not be elaborated here.

[0153] S303. Determine the resident cell according to the measurement result.

[0154] The first message sent by the network device further carries a set of cell measurement parameters. Possibly, the set of cell measurement parameters includes parameters such as R-criterion calculation parameters, preset S value thresholds for high-priority cells, and preset S value thresholds for low-priority cells. Among them, the R-criterion calculation parameters include: the reselection hysteresis value Q of the current serving cell Hyst , the offset value Q offset , the temporary offset value Q offsettemp , etc.; the preset S value thresholds for high-priority cells include: Thresh X,HighQ and / or Thresh X,HighP ; the preset S value thresholds for low-priority cells include: Thresh X,LowQ and / or ThreshX,LowP.

[0155] The terminal determines the resident cell according to the cell measurement result and the set of cell measurement parameters.

[0156] In a possible implementation, the terminal obtains a set of cell measurement parameters of one or more cells, and determines the resident cell according to the cell measurement results of the one or more cells and the set of cell measurement parameters.

[0157] When the neighboring cell is a co-frequency cell or an inter-frequency cell with the same priority, the terminal obtains the R value of each cell in the one or more cells according to the measurement result of each cell and the set of cell measurement parameters corresponding to each cell; and determines the resident cell according to the magnitudes of the R values of the one or more cells.

[0158] For example, the R value of the current serving cell can be obtained according to the signal quality Q of the current serving cell obtained by cell measurementmeas,s and the reselection hysteresis value Q of the current serving cell included in the cell parameter set hyst and the R criterion calculation parameter Qoffsettemp; the R value of the neighboring cell can be obtained according to the signal quality Qmeas,n of the neighboring cell obtained through cell measurement and the R criterion calculation parameters Qoffset and Qoffsettemp included in the cell parameter set. For details, please refer to the previous text and will not be elaborated here.

[0159] The terminal determines the resident cell according to the magnitudes of the R values of one or more cells, where the R value of the resident cell is greater than or equal to the R value of the current serving cell, specifically including: the terminal selects the first neighboring cell whose R value is greater than or equal to the R value of the current serving cell as the resident cell; or the terminal selects the cell with the largest R value as the resident cell; or the terminal selects the cell with the largest RSRP from the neighboring cells whose R values are greater than the R value of the current serving cell as the resident cell.

[0160] In a possible implementation, when the R value of the neighboring cell is equal to the R value of the current serving cell, the neighboring cell is determined as the resident cell. In this possible implementation, the terminal can stay in the neighboring cell in advance to reduce subsequent cell handovers caused by satellite movement.

[0161] In another possible implementation, when the R value of the neighboring cell is equal to the R value of the current serving cell, the terminal continues to stay in the current serving cell. In this possible implementation, the terminal does not change the current resident cell, which can reduce the number of handovers of the resident cell and avoid frequent cell reselections.

[0162] When the neighboring cell is a high cell priority cell, the terminal obtains the S value of each cell according to the measurement results of one or more cells and the cell measurement parameter set corresponding to each cell; and compares the S value with the preset threshold of the high cell priority cell in the cell measurement parameter set to determine the resident cell. The S value of the resident cell should be greater than the preset threshold. Specifically, when there are multiple cells with S values greater than the preset threshold, the cell with the largest S value is selected as the resident cell. Possibly, the S value of the resident cell can be equal to the preset threshold of the high cell priority cell.

[0163] For example, the S value can be Srxlev and / or Squal. The specific calculation methods of Srxlev and Squal please refer to the previous text and will not be elaborated here. Comparing the S value with the preset threshold of the high priority cell in the cell measurement parameter set specifically includes: comparing Srxlev with the threshold value Thresh X,HighQ included in the cell measurement parameter set, and / or comparing Squal with the threshold value Thresh X,HighP included in the cell measurement parameter set.

[0164] When the neighboring cell is a low-cell-priority cell, the terminal obtains the S value of each cell based on the measurement results of one or more cells and the set of cell measurement parameters corresponding to each cell; and compares the S value with the preset threshold for low-cell-priority cells in the set of cell measurement parameters to determine the resident cell. Specifically, when the S value of the serving cell is less than the preset threshold and the S value of the neighboring cell is greater than the preset threshold for low-cell-priority cells, the neighboring cell is used as the resident cell. When there are multiple cells with S values greater than the preset threshold, the cell with the largest S value is selected as the resident cell. Possibly, the S value of the resident cell may be equal to the preset threshold for low-cell-priority cells.

[0165] For example, the S value can be Srxlev and / or Squal. The specific calculation methods of Srxlev and Squal can be referred to in the previous text and will not be elaborated here. Comparing the S value with the preset threshold for low-cell-priority cells in the set of cell measurement parameters specifically includes: comparing Srxlev with the threshold value Thresh X,LowQ included in the set of cell measurement parameters, and / or comparing Squal with the threshold value Thresh X,LowP included in the set of cell measurement parameters.

[0166] Figure 3 In the cell selection strategy shown, the terminal obtains the polarization priority information sent by the network, and based on this polarization priority information, selects the polarization direction with a higher priority for cell measurement to determine the resident cell. By indicating the priority of the polarization direction, the network ensures that the terminal comprehensively selects a more suitable resident cell in combination with different polarization directions, achieving load balancing in different polarization directions.

[0167] See Figure 5 Figure 5 which is an interaction diagram of the cell selection and cell reselection strategies provided by the embodiments of the present application. In this embodiment, for different polarization directions of the same cell, the network device sends different sets of cell measurement parameters, and the terminal calculates the corresponding thresholds according to the sets of cell measurement parameters corresponding to each polarization direction, and comprehensively makes a decision on a more suitable resident cell and its polarization direction in combination with the cell measurement results.

[0168] S501. The network device broadcasts a system message. Correspondingly, the terminal receives the system message broadcast by the network device. The system message contains the sets of cell measurement parameters corresponding to different polarization directions.

[0169] The sets of cell measurement parameters corresponding to different polarization directions include the R-criterion calculation parameters corresponding to different polarization directions, the preset threshold for the S value of high-priority cells, the preset threshold for the S value of low-priority cells, and other parameters. The sets of cell measurement parameters corresponding to different polarization directions may also include other parameters, which are not limited in this application.

[0170] The R criterion is used to determine the resident cell. For specific details, please refer to the above text and will not be elaborated here.

[0171] For example, the S value can be Srxlev and / or Squal. The specific calculation methods of Srxlev and Squal can be found in the above text and will not be elaborated here.

[0172] Among them, the R criterion calculation parameters include: the reselection hysteresis value Q of the current serving cell Hyst , the offset value Qoffset, the temporary offset value Qoffsettemp, etc. For example, the R criterion calculation parameters corresponding to LHCP can be respectively expressed as: Q Hyst_LHCP , Qoffset _LHCP and Qoffsettemp _LHCP ; the R criterion calculation parameters corresponding to RHCP can be respectively expressed as: Q Hyst_RHCP , Qoffset _RHCP and Qoffsettemp _RHCP .

[0173] The preset threshold of the S value for high cell priority includes: Thresh X,HighQ and / or Thresh X,HighP . For example, the preset threshold of the S value for high cell priority corresponding to LHCP can be expressed as: Thresh X_LHCP,HighQ and / or Thresh X_LHCP,HighP ; the preset threshold of the S value for high cell priority corresponding to RHCP can be expressed as: Thresh X_RHCP,HighQ and / or Thresh X_RHCP,HighP .

[0174] The preset threshold of the S value for low cell priority includes: Thresh X,LowQ and / or Thresh X,LowP . For example, the preset threshold of the S value for low cell priority corresponding to LHCP can be expressed as: Thresh X_LHCP,LowQ and / or Thresh X_LHCP,LowP ; the preset threshold of the S value for low cell priority corresponding to RHCP can be expressed as: Thresh X_RHCP,LowQ and / or Thresh X_RHCP,LowP . It should be noted that other methods can also be used to represent the parameters corresponding to different polarization directions, and the present application does not make any restrictions.

[0175] It should be noted that the cell priority information can be obtained from the system information block (SIB) sent by the current serving cell. For example, the cell priority information can be represented by cellReselectionPriority carried in the SIB message, and the value range is an integer from 0 to 7. The larger the parameter value, the higher the cell priority. The cell priority can be determined by cell load, power consumption, etc. Possibly, different manufacturers can use different algorithms to determine the cell priority, and this application does not make any restrictions.

[0176] In a possible implementation, the network device broadcasts a set of measurement parameters corresponding to different polarization directions of each cell in one or more cells. Correspondingly, the terminal receives the set of measurement parameters corresponding to different polarization directions of each cell in one or more cells broadcast by the network device.

[0177] It should be noted that the cell measurement parameters corresponding to different polarization directions of a cell are determined by the load and power consumption on different polarization directions within the cell. Different manufacturers can use different algorithms to determine the cell priority. For example, if the load on the LHCP direction of a certain cell is large and the load on the RHCP direction is small, the deviation value corresponding to the LHCP direction can be increased, such as: Qoffset _LHCP , Qoffsettemp _LHCP , and the deviation value corresponding to the RHCP direction can be decreased, such as Qoffset _RHCP , Qoffsettemp _RHCP , so as to achieve load balancing in different polarization directions.

[0178] S502: When the cell measurement conditions are met, perform cell measurement.

[0179] The cell measurement conditions include one or more of the following: the terminal is in the initial access state or the connected state; or there is an adjacent cell with a cell priority higher than that of the terminal's current serving cell; or the serving cell of the communication device meets the cell measurement start threshold. For specific details, please refer to the content described in S302 and will not be elaborated here.

[0180] When the cell measurement conditions are met, the terminal performs cell measurement and obtains the cell measurement result.

[0181] In a possible implementation, the terminal measures one or more cells and obtains the measurement results corresponding to one or more cells.

[0182] S503: Determine the resident cell according to the cell measurement result and the set of cell measurement parameters.

[0183] After the terminal obtains the cell measurement result, it determines the resident cell according to the measurement result and the set of cell measurement parameters corresponding to different polarization directions obtained from the broadcast message. Specifically, the terminal calculates the thresholds corresponding to different polarization directions respectively according to the cell measurement result and the set of cell measurement parameters corresponding to each polarization direction, and determines the resident cell and the polarization direction according to the threshold.

[0184] In a possible implementation, the terminal obtains the set of measurement parameters corresponding to different polarization directions of each cell in one or more cells, and determines the resident cell and the corresponding polarization direction according to the set of measurement parameters corresponding to different polarization directions of each cell in one or more cells and the measurement results of each cell in the one or more cells.

[0185] When the neighboring cell is a co-frequency cell or an inter-frequency cell with the same priority, the terminal obtains the R value of each cell according to the measurement result of each cell in one or more cells and the set of cell measurement parameters corresponding to different polarization directions of each cell; and determines the resident cell and the corresponding polarization direction according to the magnitudes of the R values of different polarization directions of the one or more cells.

[0186] For example, when obtaining two R values corresponding to LHCP and RHCP respectively for each cell and determining the resident cell using the R criterion, the R value of the serving cell is compared with the higher R value of the neighboring cell in terms of polarization direction to determine the resident cell.

[0187] The R value in the LHCP direction of the current serving cell can be obtained according to the signal quality Q of the current serving cell obtained from cell measurement meas,s and the reselection hysteresis value Q corresponding to the LHCP direction of the current serving cell included in the set of cell parameters Hyst_LHCP and the R criterion calculation parameter Qoffsettemp _LHCP The R value in the RHCP direction of the current serving cell can be obtained according to the signal quality Q of the current serving cell obtained from cell measurement meas,s and the reselection hysteresis value Q corresponding to the RHCP direction of the current serving cell included in the set of cell parameters Hyst_RHCP and the R criterion calculation parameter Qoffsettemp _RHCP The R value corresponding to LHCP of the neighboring cell can be obtained according to the signal quality Q of the neighboring cell obtained through cell measurement meas,n and the R criterion calculation parameter Qoffset included in the set of cell parameters _LHCP and Qoffsettemp _LHCP The R value corresponding to RHCP of the neighboring cell can be obtained according to the signal quality Q of the neighboring cell obtained through cell measurement meas,n and the R criterion calculation parameter Qoffset included in the set of cell parameters _RHCPand Qoffsettemp _RHCP It can be obtained. The specific calculation method can be seen in the previous text and will not be elaborated here.

[0188] The R value of the resident cell should be greater than or equal to the R value of the current serving cell. Specifically, the terminal selects the cell with the largest R value as the resident cell and uses the polarization direction corresponding to the cell measurement parameters when obtaining this R value as the polarization direction of the resident cell; or the terminal selects the cell with the largest RSRP from the neighboring cells whose R values are greater than or equal to the R value of the current serving cell as the resident cell and uses the polarization direction corresponding to the cell measurement parameters when obtaining this R value as the polarization direction of the resident cell; or the terminal selects the first neighboring cell whose R value is greater than the R value of the current serving cell as the resident cell and uses the polarization direction corresponding to the cell measurement parameters when obtaining this R value as the polarization direction of the resident cell. Possibly, if the two R values corresponding to the first neighboring cell whose R value is greater than the R value of the current serving cell are both greater than the R value of the serving cell, then use the polarization direction corresponding to the higher R as the polarization direction of the resident cell.

[0189] In a possible implementation, when the R value of a neighboring cell is equal to the R value of the current serving cell, determine the neighboring cell as the resident cell and use the polarization direction corresponding to this R value as the polarization direction of the resident cell; in another possible implementation, when the R value of a neighboring cell is equal to the R value of the current serving cell, the terminal continues to reside in the current serving cell. When the neighboring cell is a high cell priority cell, the terminal obtains the S value corresponding to different polarization directions of each cell according to the measurement results of one or more cells and the set of cell measurement parameters corresponding to different polarization directions of each cell; and compares the S value with the preset thresholds corresponding to different polarization directions of the high priority cells in the set of cell measurement parameters to determine the resident cell. The S value of the resident cell should be greater than the preset threshold. Specifically, when there are multiple cells with S values greater than the preset threshold, select the cell with the largest S value as the resident cell. Possibly, the S value of the resident cell can be equal to the preset threshold.

[0190] For example, for each cell, obtain two S values corresponding to LHCP and RHCP respectively, and compare them with the preset thresholds of high cell priority cells corresponding to different polarization directions to determine the resident cell. For example, the S value can be Srxlev and / or Squal. The specific calculation methods of Srxlev and Squal can be referred to in the previous text and will not be elaborated here. Comparing the S value with the preset thresholds of high priority cells in the set of cell measurement parameters specifically includes: comparing the Srxlev corresponding to LHCP with the threshold value Thresh corresponding to LHCP included in the set of cell measurement parameters X_LHCP,HighQ and / or, comparing Squal with the threshold value Thresh included in the set of cell measurement parameters X_LHCP,HighPCompare; compare the Srxlev corresponding to RHCP with the threshold Thresh corresponding to RHCP included in the set of cell measurement parameters X_RHCP,HighQ Compare, and / or compare Squal with the threshold Thresh X_RHCP,HighP included in the set of cell measurement parameters.

[0191] When the neighboring cell is a low cell priority cell, the terminal obtains the S value corresponding to different polarization directions of each cell according to the measurement results of one or more cells and the set of cell measurement parameters corresponding to different polarization directions of each cell; and compares the S value with the preset thresholds corresponding to different polarization directions in the set of cell measurement parameters to determine the resident cell. Specifically, when the S value of the serving cell is less than the preset threshold and the S value of the neighboring cell is greater than the preset threshold of the low cell priority cell, the neighboring cell is used as the resident cell. When there are multiple cells with S values greater than the preset threshold, the cell with the largest S value is selected as the resident cell. When the S value of the neighboring cell is equal to the preset threshold of the low cell priority cell, the neighboring cell can be used as the resident cell, or continue to reside in the current serving cell.

[0192] For example, obtain two S values corresponding to LHCP and RHCP of the serving cell, compare them with the preset threshold. When the S values corresponding to both polarization directions are less than the preset threshold, obtain the S values corresponding to LHCP and RHCP of the neighboring cell, and compare them with the preset thresholds of the low cell priority cell corresponding to different polarization directions to determine the resident cell. The S value can be Srxlev and / or Squal. The specific calculation methods of Srxlev and Squal are referred to in the previous text and will not be elaborated here. Comparing the S value with the preset threshold of the low cell priority cell in the set of cell measurement parameters specifically includes: comparing the Srxlev corresponding to LHCP with the threshold Thresh X_LHCP,LowQ included in the set of cell measurement parameters, and / or comparing the Squal corresponding to LHCP with the preset threshold value Thresh of the low cell priority included in the set of cell measurement parameters X_LHCP,LowP for comparison; comparing the Srxlev corresponding to RHCP with the threshold Thresh X_RHCP,LowQ included in the set of cell measurement parameters, and / or comparing the Squal corresponding to RHCP with the preset threshold value Thresh of the low cell priority included in the set of cell measurement parameters X_RHCP,LowP for comparison.

[0193] Figure 5 In the cell selection strategy shown, the network device issues different cell measurement parameter values for different polarization directions, thereby affecting the determination of a more suitable resident cell and polarization direction when the terminal performs cell selection or reselection, and realizing load balancing in different polarization directions.

[0194] See Figure 6 , Figure 6 which is an interaction schematic diagram of the cell handover method provided by the embodiment of the present application. In this embodiment, when a handover is triggered, the source network device sends indication information of the polarization direction of the target cell to the terminal, so that the terminal decides to access and camp on the specified polarization direction of the target cell according to this indication, realizing load balancing on different polarization directions.

[0195] S601, Measurement control and reporting

[0196] When the terminal is in a connected state, the first network device (such as the source gNB in Figure 6 ) sends measurement control information to the terminal. Correspondingly, the terminal receives the measurement control information sent by the first network device. This measurement control information is used to indicate the relevant configurations of measurement control.

[0197] This measurement control information is a unicast message, that is, a user-specific (UE-specific) message.

[0198] In one possible implementation, the measurement control information includes polarization priority information.

[0199] In one possible implementation, the polarization priority information includes the polarization priority information corresponding to LHCP and RHCP, and the values of the priority information corresponding to different polarization directions are different. Possibly, a higher value indicates a higher priority, or a lower value indicates a lower priority;

[0200] In another possible implementation, the polarization priority information is used to indicate the polarization direction with a higher priority. Specifically, the polarization priority information includes the identifier corresponding to LHCP or the identifier corresponding to RHCP; or, the network device and the terminal can pre-agree that "1" represents RHCP and "0" represents LHCP. If the priority of RHCP is higher, the value of the bit corresponding to the polarization priority is 1. If the priority of LHCP is higher, the value of the bit corresponding to the polarization priority is 0; it can also be that "1" represents LHCP and "0" represents LHCP. The present application does not make any restrictions.

[0201] In one possible implementation, the network device sends the measurement control information through RRC signaling. For example, the measurement control information is sent through the RRC Connection Reconfiguration message.

[0202] After obtaining the measurement control information, the terminal performs cell measurement according to the relevant configurations indicated by this measurement control information. Specifically, the terminal performs cell measurement in the polarization direction with a higher polarization priority.

[0203] The terminal performs cell measurements. Specifically, the terminal measures the RSRP, reference signal received quality (RSRQ), or signal to interference plus noise ratio (SINR) of the serving cell and neighboring cells.

[0204] When the measurement report condition is met, the terminal reports the measurement result to the first network device via an event. Correspondingly, the first network device receives the measurement result. The measurement report condition is the same as that in the prior art and will not be elaborated here.

[0205] S602. Handover decision.

[0206] The first network device evaluates based on the measurement result reported by the terminal and decides whether to trigger a handover.

[0207] S603. Handover request.

[0208] If the handover decision result is to perform a cell handover, a handover request is sent to the second network device (such as the target gNB in Figure 6 ). Correspondingly, the second network device receives the handover request sent by the first network device.

[0209] S604. Admission control.

[0210] After receiving the handover request, the second network device performs admission control and radio resource configuration.

[0211] S605. Handover request confirmation.

[0212] After the second network device completes admission and radio resource configuration, it sends a handover request confirmation message to the first network device. Correspondingly, the first network device receives the handover request confirmation message sent by the second network device.

[0213] S606. Trigger handover.

[0214] After receiving the handover request confirmation message sent by the second network device, the first network device triggers a handover.

[0215] During the handover trigger process, the first network device sends a handover command to the terminal. Correspondingly, the terminal receives the handover command sent by the first network device. The handover command contains information related to the terminal's access to the second network device.

[0216] In a possible implementation, in a polarization multiplexing scenario, the handover command includes indication information of the polarization direction of the target cell to which the terminal is to connect. Based on this indication information, the terminal determines the specified polarization direction on which it should connect and camp when performing cell handover. For example, if the indication information indicates LHCP, the terminal connects and camps on the left-handed circular polarization direction of the target cell; if the indication information indicates RHCP, the terminal connects and camps on the left-handed circular polarization direction of the target cell.

[0217] It should be noted that the polarization direction indicated in the handover command is determined by the load, power consumption, etc. of different polarization directions of the target cell.

[0218] In a possible implementation, this indication information is carried in the RRC message. This indication information can also be carried in other UE-Specific messages, and this application does not make any restrictions.

[0219] This handover command further includes the identifier of the target cell, the Cell Access Radio Network Temporary Identifier (C-RNTI) of the terminal, random access resources, etc. This handover command can also include other information, and this application does not make any restrictions.

[0220] S607. Perform cell handover.

[0221] After the first network device triggers cell handover, cell handover is performed, and the specific process is similar to the existing cell handover process. For example: the terminal disconnects from the source cell and establishes synchronization with the target cell; the first network device sends user data to the second network device, and this user data includes both cached user data and in-transit user data; the second network device caches the user data; the terminal establishes synchronization with the target cell and completes the handover process.

[0222] In the above embodiments, the measurement control information sent by the network device carries polarization priority information, and / or indicates the polarization direction of the target cell to the terminal during cell handover, achieving the effect of different load balancing.

[0223] The above describes the method embodiments provided by this application. In the cell selection strategy of this application embodiment, the dimension of the polarization direction is added, increasing the physical dimension of cell selection, optimizing the existing cell selection and reselection strategies, and ensuring that the terminal can determine a more suitable cell to camp on.

[0224] To implement each function in the method provided in the embodiments of the present application above, both the terminal device and the network device may include a hardware structure and / or a software module, and implement the above functions in the form of a hardware structure, a software module, or a combination of a hardware structure and a software module. Whether a certain function among the above functions is executed in the form of a hardware structure, a software module, or a combination of a hardware structure and a software module depends on the specific application and design constraints of the technical solution.

[0225] As Figure 7 shown, based on the same inventive concept, the embodiments of the present application further provide a communication device 700. The communication device 700 may be a terminal device or a network device, or a device in the terminal device or the network device, or a device that can be used in combination with the terminal device and the network device. In a possible implementation, the communication device 700 may include modules or units corresponding one by one to the methods / operations / steps / actions executed by the terminal in the above method embodiments. The unit may be a hardware circuit, software, or a combination of a hardware circuit and software. In a possible implementation, the communication device 700 may include a processing unit 710 and a transceiver unit 720. The processing unit 710 may be used to call the transceiver unit 720 to execute the receiving and / or sending functions.

[0226] When the communication device 700 is used to execute the operations performed by the terminal, the transceiver unit 720 is used to obtain polarization priority information of one or more cells, and the processing unit 710 is used to perform cell measurement on the one or more cells according to the polarization priority information when the cell measurement conditions are met, and determine a resident cell according to the measurement results of the one or more cells.

[0227] When the communication device 700 is used to execute the operations performed by the network device, the processing unit 710 is used to determine polarization priority information; the transceiver unit 720 is used to send a first message to the terminal, and the first message includes polarization priority information, and the polarization priority information is used to measure a cell to obtain a cell measurement result when the cell measurement conditions are met; the cell measurement result is used to select a resident cell of the communication device.

[0228] The transceiver unit 720 is further used to execute other receiving or sending steps or operations performed by the terminal and the network device in the above method embodiments. The processing unit 710 may also be used to execute other corresponding steps or operations other than receiving and sending performed by the terminal and the network device in the above method embodiments, which will not be elaborated here one by one.

[0229] In the embodiments of the present application, the division of modules is illustrative, merely a logical function division. In actual implementation, there may be other division methods. Additionally, in each embodiment of the present application, each functional module or unit may be integrated in a processor, may exist alone physically, or two or more modules or units may be integrated in one module or unit. The above integrated module or unit may be implemented in the form of hardware or in the form of a software functional module.

[0230] Participate Figure 8 , embodiments of the present application further provide a communication device 800 for implementing the functions of the terminal device and the network device in the above method. The communication device may be a terminal device, a network device, or a device in the terminal device or the network device, or a device that can be used in matching with the terminal device and the network device. Among them, the communication device 800 may be a chip system. In the embodiments of the present application, the chip system may be composed of chips or may include chips and other discrete devices. The communication device 800 includes at least one processor 810 for implementing the functions of the terminal device and the network device in the method provided by the embodiments of the present application. The communication device 800 may further include a communication interface 820. In the embodiments of the present application, the communication interface may be a transceiver, a circuit, a bus, a module, or other types of communication interfaces for communicating with other devices through a transmission medium. For example, the communication interface 820 is used for the device in the communication device 800 to communicate with other devices.

[0231] The processor 810 may execute the functions performed by the processing unit 710 in the communication device 700; the communication interface 820 may be used to execute the functions performed by the transceiver unit 720 in the communication device 700.

[0232] When the communication device 800 is used to perform the operations performed by the terminal, the communication interface 820 is used to obtain polarization priority information of one or more cells; the processor 810 is used to perform cell measurement on the one or more cells according to the polarization priority information when the cell measurement conditions are met, and determine a resident cell according to the measurement results of the one or more cells.

[0233] When the communication device 800 is used to perform the operations performed by the network device, the processor 810 is used to determine polarization priority information; the communication interface 820 is used to send a first message to the terminal, and the first message includes polarization priority information, and the polarization priority information is used to measure a cell to obtain a cell measurement result when the cell measurement conditions are met; the cell measurement result is used to select a resident cell of the communication device.

[0234] The communication interface 820 is also used to perform other receiving or transmitting steps or operations executed by the terminal and the network device in the foregoing method embodiments. The processor 810 may also be used to perform other corresponding steps or operations executed by the terminal and the network device in the foregoing method embodiments except for receiving and transmitting, which will not be elaborated herein one by one.

[0235] The communication device 800 may further include at least one memory 830 for storing program instructions and / or data. The memory 830 is coupled to the processor 810. The coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units or modules, which may be electrical, mechanical or other forms for information interaction between devices, units or modules. The processor 820 may cooperate with the memory 830. The processor 810 may execute the program instructions stored in the memory 830. In a possible implementation, at least one of the at least one memory may be integrated with the processor. In another possible implementation, the memory 830 is located outside the communication device 800.

[0236] In the embodiments of the present application, the specific connection medium between the communication interface 820, the processor 810 and the memory 830 is not limited. In the embodiments of the present application Figure 8 it is shown that the memory 830, the processor 810 and the communication interface 820 are connected through a bus 840. The bus is represented by a thick line in Figure 8 The connection manners between other components are only for illustrative purposes and are not to be construed as limiting. The bus may be divided into an address bus, a data bus, a control bus, etc. For the sake of simplicity of representation, Figure 8 only one thick line is used to represent it in

[0237] In the embodiments of the present application, the processor 810 may be one or more central processing units (CPUs). When the processor 810 is a single CPU, the CPU may be a single-core CPU or a multi-core CPU. The processor 810 may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field-programmable gate array or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and may implement or execute the various methods, steps and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the method disclosed in combination with the embodiments of the present application may be directly embodied as being executed by a hardware processor, or executed by a combination of hardware and software modules in the processor.

[0238] In the embodiments of the present application, the memory 830 may include, but is not limited to, non-volatile memories such as a hard disk drive (HDD) or a solid-state drive (SSD), a random access memory (RAM), an erasable programmable read-only memory (EPROM), a read-only memory (ROM), or a compact disc read-only memory (CD-ROM), etc. The memory is any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory in the embodiments of the present application may also be a circuit or any other device capable of implementing a storage function, for storing program instructions and / or data. The memory 820 is used for relevant instructions and data.

[0239] Participate Figure 9 In addition, the embodiments of the present application further provide a device 900, which can be used to implement the functions of the terminal device and the network device in the above method. The device 900 may be a communication device or a chip in a communication device. The communication device includes:

[0240] At least one input / output interface 910 and a logic circuit 920. The input / output interface 910 may be an input / output circuit. The logic circuit 920 may be a signal processor, a chip, or other integrated circuits that can implement the method of the present application.

[0241] Among them, at least one input / output interface 910 is used for input or output of signals or data. For example, when the device is a terminal or is used for a terminal, the input / output interface 910 is used to obtain a first message, and the first message carries polarization priority information and / or a set of cell measurement parameters. Also, taking the Figure 6 method shown as an example, the input / output interface 910 may also be used to output cell measurement results to report the measurement results to a first network device. For example, when the device is a network device or is used for a network device, the input / output interface 910 is used to send a first message to the terminal, and the message carries polarization priority information and / or a set of cell measurement parameters. Also, taking the Figure 6 method shown as an example, the input / output interface 910 may also be used to obtain cell measurement results reported by the terminal.

[0242] Among them, the logic circuit 920 is used to execute some or all of the steps of any method provided in the embodiments of the present application. The logic circuit can implement the functions implemented by the processing unit 710 in the above device 700 and the processor 810 in the device 800.

[0243] When the above communication device is a chip applied to a terminal device, the terminal device chip implements the functions of the terminal device in the above method embodiments. The terminal device chip receives information from other modules (such as a radio frequency module or an antenna) in the terminal device, and the information is sent by a network device to the terminal device; or, the terminal device chip sends information to other modules (such as a radio frequency module or an antenna) in the terminal device, and the information is sent by the terminal device to the network device.

[0244] When the above communication device is a chip applied to a network device, the network device chip implements the functions of the network device in the above method embodiments. The network device chip receives information from other modules (such as a radio frequency module or an antenna) in the network device, and the information is sent by a terminal device to the network device; or, the network device chip sends information to other modules (such as a radio frequency module or an antenna) in the network device, and the information is sent by the network device to the terminal device.

[0245] Based on the same concept as the above method embodiments, an embodiment of the present application further provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and the computer program is executed by hardware (such as a processor, etc.) to implement some or all of the steps of any method executed by any device in the embodiments of the present application.

[0246] Based on the same concept as the above method embodiments, an embodiment of the present application further provides a computer program product including instructions. When the computer program product runs on a computer, the computer is caused to execute some or all of the steps of any method in the above aspects.

[0247] Based on the same concept as the above method embodiments, the present application further provides a chip or a chip system. The chip may include a processor. The chip may further include a memory (or a storage module) and / or a transceiver (or a communication module), or the chip is coupled to a memory (or a storage module) and / or a transceiver (or a communication module). Among them, the transceiver (or the communication module) can be used to support the chip for wired and / or wireless communication, and the memory (or the storage module) can be used to store a program. The processor can call the program to implement the operations executed by a terminal or a network device in any possible implementation manner of the above method embodiments and method embodiments. The chip system may include the above chip, or may include the above chip and other discrete devices, such as a memory (or a storage module) and / or a transceiver (or a communication module).

[0248] Based on the same concept as the above method embodiments, the present application further provides a communication system, which may include the above terminal and / or network device. This communication system can be used to implement the operations performed by the terminal or the network device in any possible implementation manner of the above method embodiments and method embodiments. Exemplarily, this communication system may have a structure as shown in Figure 1 or Figure 2 shown.

[0249] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can 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 can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center in a wired manner (such as coaxial cable, optical fiber, digital subscriber line) or a wireless manner (such as infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that the computer can access or a data storage device such as a server or data center that includes one or more integrated available media. The available medium can be a magnetic medium (such as a floppy disk, hard disk, magnetic tape), an optical medium (such as an optical disc), or a semiconductor medium (such as a solid-state drive), etc. In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0250] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0251] In several embodiments provided by the present application, it should be understood that the disclosed device can also 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. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the indirect coupling or direct coupling or communication connection shown or discussed with each other can be through some interfaces. The indirect coupling or communication connection of the device or unit can be in an electrical or other form.

[0252] The unit described as a separation component may or may not be physically separated. The component shown as a unit may or may not be a physical unit, that is, it may be located in one place, or it may be distributed over multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0253] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the essence of the technical solution of this application, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application.

[0254] As described above, these are only some specific implementation manners of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed in this application can make additional changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted to include the above embodiments and all changes and modifications falling within the scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the said claims.

Claims

1. A communication method, characterized in that, including receiving a handover instruction for performing cell handover, the handover instruction including indication information of the polarization direction of a target cell; performing cell handover according to the handover instruction.

2. The method according to claim 1, wherein The polarization direction of the target cell includes at least one of the following: left-handed circular polarization, right-handed circular polarization, horizontal polarization, or vertical polarization.

3. The method according to claim 1 or 2, characterized in that, The indication information of the polarization direction of the target cell is carried in a radio resource control message.

4. The method according to any one of claims 1 to 3, characterized in that, It further includes: receiving measurement control information including an identifier corresponding to left-handed circular polarization or an identifier corresponding to right-handed circular polarization.

5. The method according to claim 4, characterized in that It further includes: The measurement control information is carried in a radio resource control signaling.

6. The method according to claim 4 or 5, characterized in that, Before receiving the handover instruction, the method further includes: performing cell measurement according to the measurement control information; reporting a measurement result when a measurement report condition is met.

7. The method according to claim 6, wherein The handover instruction is determined according to the measurement result.

8. The method according to any one of claims 1-7, characterized in that, The handover instruction further includes at least one of the following relevant information for the terminal to access the target cell: the identifier of the target cell, the cell radio network temporary identifier of the terminal, or random access resources.

9. A communication method, characterized in that, including generating a handover instruction for performing cell handover, the handover instruction including indication information of the polarization direction of a target cell; sending the handover instruction.

10. The method according to claim 9, characterized in that The polarization direction of the target cell includes at least one of the following: left-handed circular polarization, right-handed circular polarization, horizontal polarization, or vertical polarization.

11. The method according to claim 9 or 10, characterized in that, The indication information of the polarization direction of the target cell is carried in a radio resource control message.

12. The method according to any one of claims 9-11, characterized in that, It further includes: sending measurement control information including an identifier corresponding to left-handed circular polarization or an identifier corresponding to right-handed circular polarization.

13. The method according to claim 12, wherein It further includes: The measurement control information is carried in a radio resource control signaling.

14. The method according to claim 12 or 13, characterized in that, It further includes: The measurement control information is a user-specific UE-specific message.

15. The method according to any one of claims 12 - 14, characterized in that, Before sending the handover instruction, the method further includes: receiving a measurement result.

16. The method according to claim 15, wherein It further includes: determining to perform cell handover according to the measurement result, sending a handover request to a network device of the target cell, and receiving an acknowledgement message of the handover request; The sending of the handover instruction includes: sending the handover instruction after receiving the acknowledgement message of the handover request.

17. The method according to any one of claims 9-16, characterized in that, The handover instruction further includes at least one of the following relevant information for the terminal to access the target cell: the identifier of the target cell, the cell radio network temporary identifier of the terminal, or random access resources.

18. A communication device, characterized in that, including a module or unit for performing the method according to any one of claims 1 to 8.

19. A communication device, characterized in that, including a module or unit for performing the method according to any one of claims 9 to 17.

20. A communication device, characterized in that, including a processor for executing a computer program, which when executed causes the communication device to perform the method according to any one of claims 1 to 8.

21. The communication device according to claim 20, characterized in that, It further includes a memory for storing the computer program.

22. A communication device, characterized in that, including a processor for executing a computer program, which when executed causes the communication device to perform the method according to any one of claims 9 to 17.

23. The communication device according to claim 22, wherein It further includes a memory for storing the computer program.

24. A computer-readable storage medium, characterized in that, A stored computer program, which, when run on a computer, causes the method according to any one of claims 1 to 8 to be executed, or causes the method according to any one of claims 9 to 17 to be executed.

25. A computer program product comprising instructions which, when run on a computer, cause the method according to any one of claims 1 to 8 to be executed, or cause the method according to any one of claims 9 to 17 to be executed.

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