Cell selection method and apparatus

Abstract

Several embodiments of this application provide a cell selection method and device. The method includes the steps of: a communication device acquiring polarization priority information of one or more cells; performing cell measurements on one or more cells based on the polarization priority information when a cell measurement condition is met; and determining a cell to camp on based on the measurement results of the one or more cells. Several technical solutions provided by this application add a polarization direction dimension to cell selection, which can optimize existing cell selection policies and ensure that a terminal determines a more appropriate cell to camp on.

Description

[Technical field]

[0001] [CROSS-REFERENCE TO RELATED APPLICATIONS] This application claims priority to Chinese Patent Application No. 202010631577.8, entitled "Cell Selection Method and Apparatus," filed with the State Intellectual Property Administration of China on July 3, 2020, the contents of which are incorporated herein by reference in their entirety.

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

[0003] A non-terrestrial network (NTN), such as a satellite communication network, has obvious advantages such as global coverage, long-distance transmission, flexible network configuration, convenient deployment, and no geographical constraints, and can provide services to both fixed terminals and various mobile terminals. Traditional terrestrial networks are unable to provide seamless coverage, especially in places such as sea, desert, or air, where it is impossible to deploy base stations. Non-terrestrial networks are introduced into communication networks such as fifth generation (5G) systems. The non-terrestrial network can provide seamless coverage to terminal devices by deploying base stations or parts of base station functions by high-altitude platforms or satellites. In addition, natural disasters have little impact on high-altitude platforms or satellites. This improves the reliability of the 5G system.

[0004] In the case of satellite-based non-terrestrial networks, the satellites cover the earth's surface using different beams to form multiple satellite cells, and a terminal device may be served by multiple satellite cells at the same time, in which case the terminal device needs to camp on a cell by cell selection or cell reselection.

[0005] However, during numerous tests and practical applications, it has been found that based on the conventional satellite cell selection or reselection mechanism (although the conventional inter-satellite cell reselection mechanism is basically the same as the cell selection or cell reselection mechanism in a 5G network), it is difficult for a terminal device to camp on an appropriate cell in most cases. Summary of the Invention

[0006] Several embodiments of this application provide a cell selection method and apparatus to ensure that a terminal device determines a more suitable cell to camp on, implement load balancing, and ensure better communication effect.

[0007] According to a first aspect, the application provides a cell selection method, the method including: a communication device obtaining polarization priority information of one or more cells, performing cell measurement on the one or more cells based on the polarization priority information when a cell measurement condition is satisfied, and determining a cell to camp on based on a measurement result of the one or more cells.

[0008] In the cell selection method provided by the first aspect of this application, a communication device performs cell measurement to determine a cell to camp on based on the obtained polarization priority information of one or more cells. In other words, it considers polarization priority when making a cell selection or cell reselection decision, and adds a polarization direction dimension. This can optimize the existing cell selection policy and ensure that the communication device determines a more suitable cell to camp on.

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

[0010] The initial access state is when the communication device has just been powered on and is not camped on a cell. When the communication device is in an idle or inactive state, the cell measurement conditions relate to the cell priorities of neighboring cells and the signal quality in the current serving cell. When the communication device is in a connected state, the terminal performs measurements continuously.

[0011] In one possible implementation, the step of performing the cell measurement based on the polarization priority information includes the polarization priority information indicating a priority of two polarization directions corresponding to a cell, and the communication device selecting a polarization direction with a higher priority for the cell measurement based on the polarization priority information.

[0012] After obtaining the polarization priority information, the communication device performs cell measurements in the polarization directions with higher priority to obtain measurement results. It should be noted that the polarization priority information of a cell is determined by the load, power consumption, etc. in multiple different polarization directions of the cell. By performing measurements and selecting a cell to camp on based on the selected polarization direction with higher priority, it is possible to implement load balancing in multiple different polarization directions.

[0013] In one possible implementation, the step of determining a cell to camp on based on measurement results of the one or more cells includes a step by the communication device acquiring a cell measurement parameter set for the one or more cells, and a step of determining the cell to camp on based on the measurement results of the one or more cells and the cell measurement parameter set for the one or more cells.

[0014] The cell measurement parameter set includes parameters such as a reference R calculation parameter, a high cell priority threshold, and a low cell priority threshold. The cell measurement parameter set is determined by the cell according to the cell load, consumption, throughput, etc. The cell measurement result is related to the polarization priority, and the polarization priority is determined based on the load and consumption, etc. in multiple different polarization directions of the cell. The cell to camp on is determined with reference to the cell measurement result and the cell measurement parameter set, so that it is possible to select a more suitable cell and polarization direction to camp on from multiple different neighbor cells. This implements load balancing.

[0015] In one possible implementation, the step of determining a cell to camp on based on the measurement results of the one or more cells and the cell measurement parameter set of the one or more cells includes a step of obtaining an R value for each of the one or more cells based on the measurement results of the cell and a cell measurement parameter set corresponding to the cell, and a step of determining the cell to camp on based on the R value of the one or more cells.

[0016] For cells with the same cell priority, the criterion R is used to determine which cell to camp on. A larger R value indicates a higher signal quality of the cell. According to the above criterion, a neighboring cell whose communication quality is better than that of the current serving cell may be selected as the cell to camp on.

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

[0018] A larger R value indicates a higher signal quality of the cell. The R value of the cell to be camped on is equal to or greater than the R value of the serving cell, thereby ensuring that the terminal can camp on a cell with higher signal reception power and / or better signal quality, which provides communication quality.

[0019] In one possible implementation, the step of selecting a cell to camp on based on the R value of the one or more cells includes selecting a cell with a maximum R value as the cell to camp on.

[0020] After considering the priority of polarization directions during cell measurements, the cell with the largest R value is selected as the cell to camp on. In this way, the terminal can camp on a more suitable cell and ensure load balancing among multiple different polarization directions.

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

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

[0023] In existing protocols, all the parameters such as cell priority information and cell measurement parameter sets are carried in the SIB and distributed to communication devices by broadcasting, so it is easy to make it compatible with existing protocols by simply modifying the existing signaling to include the polarization priority information in the SIB.

[0024] In one possible implementation, the polarization priority information indicates a polarization direction with a higher priority, Specifically, the polarization priority information includes an identifier corresponding to left polarization or an identifier corresponding to right polarization.

[0025] For example, if the priority corresponding to the RHCP is higher, the system message carries cellReselectionRHCPPriority or other identifier corresponding to the RHCP. For example, if the network device and the communication device have previously agreed to use "1" to represent the RHCP, the value of the corresponding field in the system message is 1. According to the above method, the polarization priority may be represented by only one bit, which reduces the bit overhead.

[0026] According to a second aspect, the application provides a cell selection method. The method includes a step of a network device transmitting a first message to a communication device. The first message includes the polarization priority information. The polarization priority information is information for performing cell measurement when a cell measurement condition is satisfied, and obtaining a cell measurement result. The cell measurement result is a measurement result for selecting a cell on which the communication device should camp.

[0027] In a cell selection method provided by a second aspect of this application, a network device sends a broadcast message carrying polarization priority information to a communication device. In this way, the communication device performs cell measurement based on the polarization priority information to determine a cell to camp on. In other words, add a polarization direction dimension to a cell selection policy or a cell reselection policy. This can optimize an existing cell selection policy and ensure that the communication device determines a more suitable cell to camp on.

[0028] In one possible implementation, the polarization priority information being information for performing cell measurements and obtaining cell measurement results includes, inter alia, that the polarization priority information indicates a priority of two polarization directions corresponding to a cell, and that the polarization direction with a higher priority is the polarization direction for the cell measurement.

[0029] It should be noted that the polarization priority information of a cell is determined by the load, power consumption, etc. in different polarization directions of that cell. Based on the selection of the higher priority polarization direction, it is possible to implement load balancing in different polarization directions by performing measurements and selecting a cell to camp on.

[0030] In one possible implementation, the first message further includes a cell measurement parameter set, which, together with the cell measurement result, is a parameter set for determining the cell on which the terminal device should camp.

[0031] The cell measurement parameter set includes parameters such as a reference R calculation parameter, a high cell priority threshold, and a low cell priority threshold. The cell measurement parameter set is determined by the cell according to the cell load, consumption, throughput rate, etc. The cell measurement result is related to a polarization priority, and the polarization priority is determined based on the load and consumption in multiple different polarization directions of the cell, etc. By selecting a cell to camp on by referring to the cell measurement result and the cell measurement parameter set, it is possible to select a more suitable cell and polarization direction to camp on from multiple different neighbor cells. This implements load balancing.

[0032] In one possible implementation, the cell measurement parameter set, together with the cell measurement result, being a parameter set for determining the cell on which the terminal device should camp includes that the cell measurement parameter set and the cell measurement result are specifically a parameter set and measurement result for obtaining an R value, and the R value is a value for selecting the cell on which the communication device should camp.

[0033] For cells with the same cell priority, the criterion R is used to determine which cell to camp on. A larger R value indicates a higher signal quality of the cell. After obtaining the R value, the criterion R calculation parameter included in the cell measurement parameter set and the cell measurement result are used to search for a cell to camp on, and the criterion R calculation parameter included in the cell measurement parameter set and the cell measurement result are used to select a neighbor cell whose communication quality is better than that of the current serving cell as the cell to camp on.

[0034] In one possible implementation, the first message is a broadcast message or the first message is a unicast message. When the terminal is in an idle state or an inactive state, the first message sent by the network device is a broadcast message. When the terminal is in a connected state, the first message sent by the network device is a unicast message, i.e., a user-specific (UE-specific) message.

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

[0036] In existing protocols, all the parameters such as cell priority information and cell measurement parameter sets are carried in the SIB and distributed to communication devices by broadcasting, so it is easy to make it compatible with existing protocols by simply modifying the existing signaling and adding the polarization priority information to the SIB.

[0037] In one possible implementation, the polarization priority information indicates a polarization direction with a higher priority, Specifically, the polarization priority information includes an identifier corresponding to left polarization or an identifier corresponding to right polarization.

[0038] For example, if the priority corresponding to LHCP is higher, the system message carries cellReselectionLHCPPriority or other identifier corresponding to LHCP. For example, if the network device and the communication device have previously agreed to use "0" to represent LHCP, the value of the corresponding field in the system message is 0. According to the above method, the polarization priority may be represented by only one bit, which reduces the bit overhead.

[0039] According to a third aspect, an embodiment of this application further provides a communication device. The communication device may be used as a communication device according to the first aspect. The communication device may be a terminal device, an apparatus (such as a chip, chip system, or circuit) in the terminal device, or an apparatus that may be used with the terminal device. In one possible implementation, the communication device may include modules or units that correspond one-to-one to the methods / operations / steps / actions described in the first aspect. The modules or units may be hardware circuits or software, or may be implemented by hardware circuits combined with software. In one possible implementation, the communication device may include a processing unit and a transceiver unit. The processing unit may be configured to call the transceiver unit to perform a transmitting function / receiving function. Some examples are as follows:

[0040] The transceiver unit is configured to obtain polarization priority information of one or more cells, and the processing unit is configured to perform cell measurements on the one or more cells based on the polarization priority information when a cell measurement condition is satisfied, and determine a cell to camp on based on the measurement results of the one or more cells.

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

[0042] In one possible implementation, the processing unit being configured to perform cell measurements based on the polarization priority information includes: the polarization priority information indicating a priority of two polarization directions corresponding to a cell; and the processing unit being configured to select, in particular, for cell measurements, a polarization direction having a higher priority based on the polarization priority information.

[0043] In one possible implementation, the processing unit being configured to determine a cell to camp on based on measurement results of the one or more cells includes the processing unit being further configured to obtain a cell measurement parameter set for the one or more cells, and to determine the cell to camp on based on the measurement results of the one or more cells and the cell measurement parameter set for the one or more cells.

[0044] In one possible implementation, being configured for the processing unit to determine the cell to camp on based on the measurement results of the one or more cells and the cell measurement parameter set of the one or more cells includes being configured for the processing unit to obtain an R value for each of the one or more cells based on, in particular, the measurement results of the cells and a cell measurement parameter set corresponding to the cells, and to determine the cell to camp on based on the R value of the one or more cells.

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

[0046] In one possible implementation, the processing unit being configured to select the cell to camp on based on the R value of the one or more cells includes the processing unit being configured to, in particular, select a cell having a maximum R value as the cell to camp on.

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

[0048] In one possible implementation, the polarization priority information is carried in a system information block SIB.

[0049] In one possible implementation, the polarization priority information indicates a polarization direction with a higher priority, Specifically, the polarization priority information includes an identifier corresponding to left polarization or an identifier corresponding to right polarization.

[0050] It should be noted that the advantageous effects of the implementations of the communication device provided by the third aspect of the embodiments of this application should refer to the advantageous effects of the cell selection method according to the first aspect, and the details will not be described repeatedly in this specification.

[0051] According to a fourth aspect, an embodiment of this application further provides a communication device. The communication device may be used as a network device according to the second aspect. The communication device may be a network device, an apparatus (such as a chip, a chip system, or a circuit) in a network device, or an apparatus that may be used with a network device. In one possible implementation, the communication device may include modules or units that correspond one-to-one to the methods / operations / steps / actions described in the second aspect. The modules or units may be hardware circuits or software, or may be implemented by hardware circuits combined with software. In one possible implementation, the communication device may include a processing unit and a transceiver unit. The processing unit is configured to call the transceiver unit to perform a receiving function / transmitting function. Examples are as follows:

[0052] The processing unit is configured to determine polarization priority information. The transceiver unit is configured to transmit a first message to another communication device. The first message includes the polarization priority information. The polarization priority information is information for performing cell measurement when a cell measurement condition is satisfied, and obtaining a cell measurement result. The cell measurement result is a measurement result for selecting a cell on which the communication device should camp.

[0053] In one possible implementation, the polarization priority information being information for performing cell measurements and obtaining cell measurement results includes, inter alia, that the polarization priority information indicates a priority of two polarization directions corresponding to a cell, and that the polarization direction with a higher priority is the polarization direction for the cell measurement.

[0054] In one possible implementation, the first message further includes a cell measurement parameter set, which, together with the cell measurement result, is a parameter set for determining the cell on which the terminal device should camp.

[0055] In one possible implementation, the cell measurement parameter set, together with the cell measurement result, being a parameter set for determining the cell on which the terminal device should camp includes that the cell measurement parameter set and the cell measurement result are specifically a parameter set and measurement result for obtaining an R value, and the R value is a value for selecting the cell on which the terminal device should camp.

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

[0057] In one possible implementation, the polarization priority information is carried in a system information block SIB.

[0058] In one possible implementation, the polarization priority information indicates a polarization direction with a higher priority, Specifically, the polarization priority information includes an identifier corresponding to left polarization or an identifier corresponding to right polarization.

[0059] The advantageous effects of the implementations of the communication device provided by the fourth aspect of the embodiments of this application include: Second It should be noted that the advantageous effects of the cell selection method according to the embodiment should be referred to, and the details will not be described repeatedly in this specification.

[0060] According to a fifth aspect, an embodiment of the present application further provides a communications device, the communications device including a processor configured to execute computer programs or executable instructions stored in a memory, the computer programs or executable instructions, when executed, causing the device to perform the first aspect and possible implementations of the first aspect. A method in any one of This makes it possible to execute the following.

[0061] In one possible implementation, the processor and the memory are integrated.

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

[0063] The communication device further includes a communication interface, which is an interface for communication between the communication device and another device, such as, for example, transmitting or receiving data and / or signals. For example, the communication interface may be a transceiver, a circuit, a bus, a module, or another type of communication interface.

[0064] According to a sixth aspect, an embodiment of the present application further provides a communications device including a processor, the processor configured to execute a computer program or executable instructions stored in a memory, the computer program or executable instructions, when executed, causing the device to perform a second aspect and a number of possible implementations of the second aspect. A method in any one of This makes it possible to execute the following.

[0065] In one possible implementation, the processor and the memory are integrated.

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

[0067] The communication device further includes a communication interface, which is an interface for communication between the communication device and another device, such as, for example, transmitting or receiving data and / or signals. For example, the communication interface may be a transceiver, a circuit, a bus, a module, or another type of communication interface.

[0068] According to 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 configured to input or output a signal or data. The input / output interface is specifically configured to obtain polarization priority information of one or more cells, and the input / output interface is further configured to output measurement results of the one or more cells. The logic circuit is configured to perform the method of the first aspect and any possible implementation of the first aspect to determine a cell to camp on.

[0069] According to an eighth aspect, an embodiment of the present application provides a communication device further including an input / output interface and a logic circuit. The logic circuit is configured to perform the method of the second aspect and any possible implementation of the second aspect to determine a first message. The first message carries polarization priority information. The input / output interface is configured to output the first message. The first message includes the polarization priority information. The input / output interface is further configured to obtain a measurement result of a cell.

[0070] According to a ninth aspect, an embodiment of the present application further provides a computer readable storage medium, the computer readable storage medium storing a computer program, the computer program being adapted to, when executed by a processor, perform a method for implementing the first aspect and any possible implementation of the first aspect. Any one of or the second aspect and any possible implementation of the second aspect Any one of The method performs some or all of the steps of the method according to the present invention.

[0071] According to a tenth aspect, an embodiment of the present application further provides a computer program product including executable instructions, the computer program product being executed by a user equipment to perform the first aspect and possible implementation of any of the first aspect. Any one of or the second aspect and any possible implementation of the second aspect Any one of The method performs some or all of the steps of the method according to the present invention.

[0072] According to an eleventh aspect, an embodiment of the present application further provides a chip system, the chip system including a processor and optionally including a memory, and the chip system includes any one of the possible implementations of the first aspect and the first aspect. Any one of or the second aspect and any possible implementation of the second aspect Any one ofThe chip system may include the chip, or may include the chip and other separate components. [Brief description of the drawings]

[0073] The following description describes some of the accompanying drawings in accordance with the embodiments of this application.

[0074] [Figure 1] 1 is a schematic diagram of a communication system according to an embodiment of the present application; [Diagram 2] 1 is an application scenario according to one embodiment of this application. [Diagram 3] 1 is a schematic flowchart of a cell selection method according to an embodiment of the present application. [Figure 4A] A schematic diagram of signaling according to one embodiment of this application in which system message SIB2 includes polarization priority. [Figure 4B] A schematic diagram of signaling according to one embodiment of this application in which system message SIB3 includes polarization priority. [Figure 4C] A schematic diagram of signaling according to one embodiment of this application in which system message SIB4 includes polarization priority. [Diagram 5] FIG. 2 is a schematic diagram of interactions in a cell selection method according to an embodiment of the present application; [Figure 6] FIG. 2 is a schematic diagram of interactions in a cell handover method according to an embodiment of the present application; [Figure 7] 1 is a schematic diagram of a configuration of a communication device according to an embodiment of the present application; [Figure 8] FIG. 11 is a schematic diagram of a configuration of another communication device according to an embodiment of the present application. [Figure 9] 11 is a schematic diagram of a configuration of yet another communication device according to an embodiment of the present application; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0075] The embodiments of this application provide a cell selection method and apparatus for optimizing an existing cell selection policy / cell reselection policy and determining a more suitable cell to camp on. The method and the apparatus are based on the same application concept. The problem-solving principle of the method is similar to that of the apparatus, so there may be cross-reference between the implementation of the apparatus and the implementation of the method, and will not be described repeatedly.

[0076] The following description describes several embodiments of this application with reference to several accompanying drawings of several embodiments of this application.

[0077] The word "and / or" in this specification only describes a relationship to describe multiple related objects, and indicates that three relationships may exist. For example, A and / or B may describe three cases: when only A exists, when both A and B exist, and when only B exists. In the specification and claims of the embodiments of this application, the words "first" and "second" are intended to distinguish between multiple different objects, but do not indicate a specific order of the multiple objects. For example, a first network device and a second network device are used to distinguish between multiple different network devices, but are not used to describe a specific order of multiple target objects. In the embodiments of this application, the words "example" or "for example" are used to indicate giving an example, illustration, or explanation. In the embodiments of this application, any embodiment or design scheme described as an "example" or "for example" should not be described as being more desirable or having more advantages than other embodiments or design schemes. To be precise, the use of the words "example" or "for example" is intended to present the related concept in a specific manner. In the description of multiple embodiments in this application, unless otherwise specified, "multiple" means two or more than two. For example, a plurality of processing units is two or more processing units. A plurality of systems is two or more systems.

[0078] The technical solution of this application may be applied to a non-terrestrial network (NTN) system, such as a satellite communication system or a high altitude platform station (HAPS) communication system. The satellite communication system may be integrated with a conventional mobile communication system. For example, the mobile communication system may be a 4th generation (4G) communication system, such as a long term evolution (LTE) system or a worldwide interoperability for microwave access (WiMAX) communication system, or a 5th generation (5G) communication system, such as a new radio (NR) system or a future mobile communication system.

[0079] FIG. 1 shows an example of a communication system applicable to an embodiment of this application. As shown in FIG. 1, an access point uses multiple beams to cover a service area. The different beams may perform communication by using one or more of time division, frequency division, and space division. The access point is not limited to a satellite base station or a terrestrial base station. The access point may be located on a high altitude platform or a satellite. The satellite may be a non-geostationary earth orbit (NGEO) satellite or a geostationary earth orbit (GEO) satellite. The satellite mentioned in the embodiments of this application may alternatively be a satellite base station or a network side device located on the satellite.

[0080] The access point is an evolved NodeB ( evolvedThe base station may be a NodeB, eNB, or eNodeB, or a base station in a 5G network or a future evolved public land mobile network (PLMN), a broadband network gateway (BNG), an aggregated switch, or a non-3rd generation partnership project (3GPP) access device, etc. This is not particularly limited in the embodiments of this application. Optionally, the base station in the embodiments of this application may include various forms of base stations, such as a macro base station, a micro base station (also called a small cell), a relay station, an access point, a next-generation base station (gNodeB, gNB), a transmitting and receiving point (TRP), a transmitting point (TP), a mobile switching center, a device providing a base station function in device-to-device (D2D) communication, vehicle-to-everything (V2X) communication, and machine-to-machine (M2M) communication. This is not particularly limited in the embodiments of this application.

[0081] The access point may communicate and interact with a core network device to provide communication services to a terminal device. For example, the core network device is a device in a 5G core network (CN). As a bearer network, the core network provides an interface to a data network, provides communication connectivity, authentication, management, and policy control for user equipment (UE), and is responsible for data services. The CN includes an Access and Mobility Management Function (AMF), a Session Management Function (SMF), an Authentication Server Function (AUSF), a Policy Control Function (PCF), and a Session Management Function (SMF). function The PFC may further include network elements such as a Policy Control Function (PCF) and a User Plane Function (UPF).

[0082] The communication devices referred to in the embodiments of this application may be terminal devices including various handheld devices, in-vehicle devices, wearable devices, or computing devices having wireless communication capabilities, or other processing devices connected to a wireless modem, and may specifically be user equipment (UE), access terminal, subscriber unit, subscriber station, mobile console, mobile station, remote station, remote terminal, mobile device, user terminal, terminal equipment, terminal, wireless communication device, user agent, or user equipment. Alternatively, the terminal device may be a satellite phone, a cellular phone, a smartphone, 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, or a personal digital assistant (PDA) station, a handheld device or a computing device with wireless communication capability, another processing device connected to a wireless modem, an in-vehicle device, 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 a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, or a terminal device in a 5G network or a future communication network, etc. This is not limited in this application.

[0083] FIG. 2 illustrates an application scenario that is applicable to one embodiment of this application. Specifically, FIG. 2 illustrates a network application architecture that merges satellite communication and 5G technology based on related 3GPP standards. It should be noted that the application architecture does not constitute a limitation to this application. The communication method provided by the embodiments of this application may also be applied to other scenarios that merge terrestrial communication systems and satellite communication. A terrestrial mobile terminal accesses a network through a 5G new radio. A satellite serves as a 5G base station and is connected to a terrestrial core network by a radio link. In addition, a radio link exists between the satellites to implement signaling exchange and user data transmission between the base stations. The following describes the network elements and interfaces between the network elements in FIG. 2.

[0084] The terminal device is a mobile device supporting 5G new radio. The terminal device can access a satellite network by a radio interface, initiate a call, access the Internet, etc. For example, the terminal device may be any terminal device described above. Details are not repeated in this specification.

[0085] 5G base stations mainly provide wireless access services, schedule wireless resources for access terminals, provide reliable wireless transmission protocols and data encryption protocols, etc.

[0086] The 5G core network provides services such as user access control, mobility management, session management, user security authentication, and charging. The 5G core network includes multiple functional units and may be divided into control plane functional entities 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) manages user plane data transmission and traffic statistics collection.

[0087] The ground station is responsible for transferring signaling and service data between the satellite base station and the 5G core network.

[0088] 5G new radio provides wireless links between terminals and multiple base stations.

[0089] The Xn interface is an interface between 5G base stations and base stations, and is primarily an interface for signaling exchange such as handover.

[0090] The NG interface is an interface between a 5G base station and a 5G core network, and is mainly used for exchanging signaling such as non-access stratum (NAS) signaling of the core network and user service data.

[0091] To facilitate understanding of the embodiments of this application, we first describe the cell selection and cell reselection mechanisms of conventional terrestrial-based networks.

[0092] (1) Cell selection

[0093] After a terminal device is powered on, the terminal device first selects a suitable PLMN and then performs cell selection in the PLMN. Cell selection is classified into initial cell selection and selection based on stored cell information. Cell selection includes four steps: frequency scan, cell search, system message decoding, and camp-on.

[0094] During initial cell selection, a frequency scan is performed prior to cell search, i.e., the terminal selects the NR frequency bands that it supports based on: Radio Frequency Channels The terminal device scans all of the cell frequencies and searches for the strongest cell in each frequency. Selection based on stored cell information is to perform cell search directly based on stored frequency information. The terminal device finds the cell with the best coverage through cell search, and synchronizes with the cell to obtain a physical cell identifier. After completing the cell search, the terminal device reads the system message of the cell, measures the signal strength and signal quality in the cell, and determines whether the cell meets the camp-on condition.

[0095] The cell camp-on condition is determined based on the criterion S. The S value of cell selection S rxle v and S qual When both are greater than 0, cell camping is permitted.

[0096] S rxlev =Q rxlevmeas -(Q rxlevmin +Q rxlevminoffset )-P compensation -Q offsettemp

[0097] S qual =Q qualmeas -(Q qualmin +Q qualminoffset )-Q offsettemp

[0098] Q rxlevmeasis the reference signal received power (RSRP) value of the cell being measured.

[0099] Q rxlevmin is the minimum RSRP receive strength requirement in that cell, obtained from the broadcast message.

[0100] Q rxlevminoffset is the offset value of the minimum access level, and is the offset value to prevent ping-pong reselection.

[0101] P compensation is a compensation value and is equal to MAX(Pemax-Pumax,0), ie, the greater of the difference between the configured value and the terminal's actual uplink transmit power and 0.

[0102] Q qualmin = q-QualMin(SIB2), where q-QualMin(SIB2) is carried in system information block (SIB) 2. If SIB3 is configured with q-QualMinOffsetCell, then Q qualmin = q-QualMin(SIB2) + q-QualMinOffsetCell(SIB3).

[0103] Q offsettemp is a temporary offset value, the value of which is announced during a system broadcast.

[0104] (2) Cell reselection

[0105] A terminal device performs cell reselection in an idle or inactive state to obtain better network service. Cell reselection includes the steps of: (1) measuring the current serving cell and neighboring cells based on a measurement enablement condition, (2) determining whether the neighboring cells meet a reselection criterion, and (3) enabling reselection if the criterion is met, receiving a system message from the new cell, and camping on the new cell if there is no access restriction, or camping on the current serving cell if the criterion is not met.

[0106] The cell measurement enabling condition is related to the cell priority and signal quality in the current serving cell. As shown in Table 1, the cell reselection scenarios are classified into intra-frequency cell reselection and inter-frequency / inter-RAT cell reselection. [Table 1]

[0107] In case of intra-frequency cell reselection, the intra-frequency measurement needs to be enabled when the S value of the serving cell is less than or equal to a specified threshold S_intrasearch (intra-frequency measurement threshold). Otherwise, the UE may choose to disable the measurement. In practical networks, the UE usually disables the measurement when S>S_intrasearch to reduce energy consumption. After obtaining the measurement result, the terminal sorts the candidate cells based on the criterion R and selects the best cell to camp on.

[0108] The criterion R calculates an R(Rank) value for each of the neighboring cells and the current serving cell based on the signal quality in those cells, and then sorts the neighboring cells and the current serving cell based on the R value. If the neighboring cell's R value is greater than the current serving cell's R value, the cell reselection criterion is met. If multiple cells' R values ​​are greater than the current serving cell's R value, select the cell with the highest R value. If the criterion R is continuously satisfied for a period longer than TreselectionRAT and the terminal has been camped on the current serving cell for a period longer than 1 second, activate the cell reselection. TreselectionRAT indicates the cell reselection interval.

[0109] The R value of the current serving cell is calculated using the formula Rs=Q meas,s +Q hyst -Q offsettemp It may be calculated by using:

[0110] The R value of the adjacent cell is given by the formula Rn=Q meas,n -Q offset -Q offsettemp It may be calculated by using:

[0111] Q meas,s Q is the signal quality of the current serving cell, which is obtained by cell measurement, and may be specifically the RSRP value of the serving cell. meas,n Q is the signal quality of the neighboring cell, which is obtained by cell measurement, specifically, it may be the RSRP value of the neighboring cell. hyst Q is the reselection hysteresis value of the current serving cell, obtained from the system. hyst The larger the value of Q, the larger the serving cell boundary is, and the lower the probability of discovering a neighboring cell by reselection. offset is the reference R calculation parameter, which is obtained in the system message. In the case of intra-frequency cell reselection, Q offsetThe value of Q offsetcell In the case of inter-frequency cell reselection, Q offset The value of Qo ffsetCell +Q offsetFreq Q offsettemp Q is also a reference R calculation parameter and is obtained from the system message. hyst、 Q offset , and Q offsettemp All of the values ​​of the standard R calculation parameters such as are 0 or greater.

[0112] The priority determines the inter-frequency cell reselection / inter-RAT cell reselection. For a higher priority cell, the terminal needs to perform measurements continuously and find the higher priority cell by reselection when the S value of the higher priority cell is greater than the corresponding threshold. For cells with the same priority or lower priority, the intra-frequency measurement needs to be enabled when the S value of the serving cell is greater than a specified threshold S_nonintrasearch (inter-frequency measurement threshold / inter-RAT measurement threshold). Otherwise, the UE may choose to disable the measurement. After obtaining the measurement result, the terminal selects the best cell to camp on based on cell reselection criteria corresponding to multiple different priority relationships. For a higher priority cell, the terminal needs to perform measurements continuously and find the higher priority cell by reselection when the S value of the higher priority cell is greater than the specified threshold S_nonintrasearch (inter-frequency measurement threshold / inter-RAT measurement threshold). X,HighQ or Thresh X,HighP If the S value of the serving cell is greater than a pre-configured threshold (e.g., Threshold, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, Serving,LowQ or Thresh Serving,LowP The S value of the cell with lower priority is smaller than the predefined threshold (Thresh X,LowQ or Thresh X,LowPIf the cell count is greater than a pre-configured threshold (e.g., 100 ms or less) and the terminal has been camped on its current serving cell for a period longer than one second, it enables reselection for that cell.

[0113] Unlike terrestrial-based communication systems, satellite communication usually uses polarization multiplexing, such as Left Hand Circularly Polarized (LHCP) or Right Hand Circularly Polarized (RHCP), horizontal or vertical polarization, or other orthogonal polarization. Different satellite cells use different polarization modes for signal transmission, which improves the spectral efficiency. The loading in different polarization directions of the same satellite may be different.

[0114] If satellite communication uses the same cell selection mechanism or cell reselection mechanism as the conventional terrestrial network, it may be difficult for a terminal to camp on a more suitable cell in many cases. To solve the above problem, this application introduces polarization multiplexing for cells in NTNs. By adding a physical dimension for cell selection and indicating the polarization direction, an optimized cell selection policy is implemented. Besides the cell priority and signal quality in a cell, the cell selection policy and cell reselection policy provided by the embodiments of this application further consider the polarization direction dimension, so that a more suitable cell to camp on can be comprehensively determined and load balancing in multiple different polarization directions can be guaranteed.

[0115] 3 is a schematic flow chart of a cell selection policy and a cell reselection policy according to an embodiment of this application. In this embodiment, a network device broadcasts polarization preference information, so that a user can refer to the polarization direction when making a cell selection decision or a cell reselection decision to comprehensively determine a more suitable cell to camp on.

[0116] It should be noted at the outset that the communication devices described in this application may be various types of terminals as mentioned above, and the following description uses a terminal as one example for purposes of illustration.

[0117] S301: Obtain polarization priority information.

[0118] The terminal obtains polarization priority information, which indicates a priority of two or more polarization directions corresponding to the cell.

[0119] The network device transmits a first message to the terminal, the first message carrying polarization priority information, and in response, the terminal receives the first message transmitted by the network device.

[0120] In some cases, the first message is a broadcast message, or the first message is a unicast message. Specifically, when the terminal is in an idle state or an inactive state, the first message may be a broadcast message, or when the terminal is in a connected state, the first message may be a unicast message.

[0121] In one possible implementation, the network device distributes polarization priority information of one or more cells by using a first message, and the terminal receives the first message transmitted by the network device and obtains the polarization priority information from the first message.

[0122] The polarization preference information of one or more cells distributed by the network device may include the polarization preference information of the current cell and may also include the polarization preference information of neighboring cells. In some cases, the polarization preference information is bound to a cell identifier.

[0123] Possibly, polarization priority information may be carried in the system information block SIB. Existing signaling may simply be modified for compatibility with existing protocols. As an example, system messages SIB2, SIB3, and SIB4 in NR are used. SIB2 contains cell reselection information related to the serving cell. SIB3 contains information about the serving frequency and intra-frequency neighboring cells related to cell reselection. SIB4 contains information about other NR frequencies and inter-frequency neighboring cells related to cell reselection.

[0124] As shown in Fig. 4A, the cell reselection serving frequency information cellReselectionServingFreqInfo subitem in SIB2 may further carry the priorities of the two polarization directions. The priorities corresponding to left and right circular polarization are indicated by the cellReselectionLHCPPriority and cellReselectionRHCPriority fields, respectively (marked by dashed boxes in the figure).

[0125] As shown in Figure 4B, the subitem IntraFreqCellReselectionInfo in SIB3 may carry the priorities of the two polarization directions. The priorities corresponding to left and right circular polarization are indicated by the cellReselectionLHCPPriority and cellReselectionRHCPriority fields, respectively (marked by dashed boxes in the figure).

[0126] As shown in Fig. 4C, the InterFreqCarrierFreqInfo subitem in SIB4 may carry the priorities of the two polarization directions. The priorities corresponding to left and right circular polarization are indicated by the cellReselectionLHCPPriority and cellReselectionRHCPriority fields, respectively (marked by dashed boxes in the figure).

[0127] In one possible implementation, the system message carries both polarization priority information corresponding to the LHCP and polarization priority information corresponding to the RHCP, and the polarization direction with a larger value is the polarization direction with a higher priority. For example, when cellReselectionLHCPPriority=0 and cellReselectionRHCPPriority=1, the above two fields indicate that the RHCP is the polarization direction with a higher priority.

[0128] In another possible implementation, the polarization priority information indicates a polarization direction with a higher priority. Specifically, the polarization priority information includes an identifier corresponding to left polarization or an identifier corresponding to right polarization. For example, if the priority corresponding to the RHCP is higher, the system message carries cellReselectionRHCPPriority or another identifier corresponding to the RHCP, and does not carry an identifier corresponding to another polarization direction. In another example, the network device and the terminal may agree in advance to use "1" to represent the RHCP and "0" to represent the LHCP. If the priority corresponding to the RHCP is higher, the value of the bit corresponding to the polarization priority is "1". If the priority corresponding to the LHCP is higher, the value of the bit corresponding to the polarization priority is 0. Or, "1" may be used to represent the LHCP and "0" may be used to represent the LHCP. This is not limited in this application. In this possible implementation, the polarization priority may be represented using only one bit. This allows the bit overhead to be reduced.

[0129] It should be noted that the polarization priority information of a cell is determined by the load and power consumption in different polarization directions of the cell. Different vendors may use different algorithms to determine the cell priority. For example, if the load in the LHCP direction of a cell is higher and the load in the RHCP direction of the cell is lower, the load balancing is achieved by using the RHCP with the lower load as the higher priority polarization direction.

[0130] S302: When a cell measurement condition is satisfied, perform cell measurement based on polarization priority information.

[0131] Specifically, when the cell measurement condition is satisfied, the terminal selects a polarization direction with a higher polarization priority based on the polarization priority information obtained from the first message, and performs cell measurement via the measurement port.

[0132] In one possible implementation, the terminal selects a polarization direction with a higher polarization priority for each of the one or more cells based on polarization priority information of the one or more cells obtained from the first message, and performs cell measurement, thereby obtaining cell measurement results for the one or more cells.

[0133] The cell measurement conditions include one or more of the following: the terminal is in an initial access state or a connected state; there is a neighbor cell whose cell priority is higher than that of the terminal's current serving cell; or the terminal's serving cell meets a cell measurement enable threshold. It should be noted that the initial access state is a state in which the terminal has just been powered on and has not yet camped on a cell. In this case, the terminal performs a cell search by frequency scanning or based on stored cell information to find the cell with the best coverage, and synchronizes with the cell to obtain a physical cell identifier. After completing the cell search, the terminal device decodes the system message of the cell to obtain the polarization priority information of the cell and other parameters related to cell selection, and performs cell measurement based on the polarization priority information.

[0134] When the terminal is in a connected state, it performs cell measurements continuously and reports the measurement results to the network device periodically or reports the measurement results to the network device under an event trigger condition.

[0135] When the terminal is in an idle or inactive state, if there is a neighbor cell whose cell priority is higher than that of the current serving cell, the measurement is unconditionally enabled. The cell priority information may be obtained from a system message SIB delivered by the current serving cell. For example, the cell priority information may be indicated by cellReselectionPriority carried in a SIB message, and the value of cellReselectionPriority is an integer ranging from 0 to 7. A larger value of the parameter indicates a higher cell priority. The cell priority may be determined by the load and power consumption of the cell, etc. Different vendors may use different algorithms to determine the cell priority, which is not limited in this application.

[0136] When the terminal is in an idle state and the cell priority of a neighboring cell is equal to or lower than the cell priority of the current serving cell, if the current serving cell satisfies the cell measurement enable threshold, the terminal performs cell measurement. For example, in the case of an intra-frequency cell, when the S value of the current serving cell is equal to or lower than the intra-frequency measurement threshold (S_IntraSearch), the terminal performs cell measurement based on polarization priority information. In the case of an inter-frequency cell or an inter-RAT cell, when the S value of the current serving cell is equal to or lower than the inter-frequency measurement threshold (S_nonIntraSearch), the terminal performs cell measurement based on polarization priority information. Specifically, when a neighboring cell is an intra-frequency cell with the same priority and the S value of the current serving cell satisfies the cell measurement enable threshold, the terminal performs cell measurement based on polarization priority information. rxlev ≦SIntraSearchP and S qual When SIntraSearchQ, the terminal performs cell measurement based on the polarization priority information. If the neighboring cell is an inter-frequency neighboring cell / inter-RAT neighboring cell with the same priority or an inter-frequency neighboring cell / inter-RAT neighboring cell with a lower priority, and S rxlev ≦SnonIntraSearchP and S qual When ≦SnonIntraSearchQ, the terminal performs measurements based on the polarization priority information.

[0137] In one possible implementation, in the case of an intra-frequency cell, when the S value of the current serving cell is smaller than the intra-frequency measurement threshold (S_IntraSearch), the terminal performs cell measurement based on the polarization priority information. When the S value of the current serving cell is equal to S_IntraSearch, the terminal does not perform cell measurement. In the case of an inter-frequency cell or an inter-RAT cell, when the S value of the current serving cell is smaller than the inter-frequency measurement threshold (S_nonIntraSearch), the terminal performs cell measurement based on the polarization priority information. When the S value of the current serving cell is equal to S_nonIntraSearch, the terminal does not perform cell measurement.

[0138] It should be noted that all edge cases (such as when the S value is equal to the measurement threshold) in this embodiment of this application may be handled by the above scheme. For example, when the S value is in an edge case, cell measurement may or may not be performed. For the calculation scheme of the S value, please refer to the above description. The details will not be repeated in this specification.

[0139] S303: Based on the measurement result, a cell to camp on is determined.

[0140] The first message sent by the network device further carries a cell measurement parameter set. The cell measurement parameter set may include parameters such as a reference R calculation parameter, a pre-configured S value threshold for a higher priority cell, and a pre-configured S value threshold for a lower priority cell. The reference R calculation parameter may include a reselection hysteresis value Q of the current serving cell. Hyst , offset value Q offset , and a temporary offset value Q offsettemp The pre-defined S-value threshold for higher priority cells is Threshold. X,HighQ and / or Thresh X,HighP The preset S value threshold for lower priority cells is Threshold X,LowQ and / or Thresh X,LowP Includes.

[0141] The terminal determines a cell to camp on based on the measurement results and the cell measurement parameter set.

[0142] In one possible implementation, the terminal obtains cell measurement parameter sets of one or more cells, and determines a cell to camp on based on the cell measurement results and the cell measurement parameter sets of the one or more cells.

[0143] When the neighboring cells are intra-frequency cells or inter-frequency cells with the same priority, the terminal obtains an R value for each of the one or more cells based on the measurement results of the cells and the cell measurement parameter sets corresponding to the cells, and determines a cell to camp on based on the R values ​​of the one or more cells.

[0144] For example, the signal quality Q of the current serving cell obtained by cell measurements meas,s、 The reselection hysteresis value Q of the current serving cell included in the cell measurement parameter set hyst and standard R calculation parameter Q offsettemp The R value of the current serving cell may be obtained based on the signal quality Q of the neighboring cell obtained by cell measurement. meas,n , and the reference R calculation parameter Q included in the cell measurement parameter set offset and Q offsettemp The R value of the neighboring cell may be obtained based on the above. For details, please refer to the above description. The details will not be described repeatedly in this specification.

[0145] The terminal determining a cell on which to camp based on the R value of one or more cells, where the R value of the cell on which to camp is equal to or greater than the R value of the current serving cell, specifically includes the terminal selecting a first neighboring cell whose R value is equal to or greater than the R value of the current serving cell as the cell on which to camp, the terminal selecting a cell with the largest R value as the cell on which to camp, or the terminal selecting a cell with the largest RSRP from the neighboring cells whose R value is greater than the R value of the current serving cell as the cell on which to camp.

[0146] In one possible implementation, when the R value of a neighboring cell is equal to the R value of the current serving cell, the terminal determines the neighboring cell as the cell to camp on. In this possible implementation, the terminal may camp on the neighboring cell in advance to reduce subsequent cell handovers caused by satellite motion.

[0147] 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 camp on the current serving cell. In this possible implementation, the terminal does not change the current cell to camp on. This reduces the number of handovers between cells to camp on and avoids frequent cell reselection.

[0148] When the neighboring cell is a higher priority cell, the terminal obtains an S value of each cell based on the measurement results of one or more cells and the cell measurement parameter set corresponding to the cell, and compares the S value with a preset threshold value of the higher priority cell included in the cell measurement parameter set to determine the cell to camp on. The S value of the cell to camp on must be greater than the preset threshold value. Specifically, when there are multiple cells with S values ​​greater than the preset threshold value, the cell with the largest S value is selected as the cell to camp on. The S value of the cell to camp on may be equal to the preset threshold value of the higher priority cell.

[0149] For example, the S value is S rxlev and / or S. qual It may be. S rxlev and S qual For the specific calculation method of S, please refer to the above description. Details will not be described repeatedly in this specification. The step of comparing the S value with the preset threshold value of the higher priority cell in the cell measurement parameters is specifically performed by comparing the S value with the threshold value Threshold included in the cell measurement parameter set. X,HighQ and S. rxlev and / or a threshold value included in the cell measurement parameter set, Threshold X,HighP and S. qual The method includes a step of comparing the

[0150] When the neighboring cell is a lower priority cell, the terminal obtains an S value of each cell based on the measurement results of one or more cells and the cell measurement parameter set corresponding to the cell, and compares the S value with a preset threshold of the lower priority cell included in the cell measurement parameter set to determine the cell to camp on. Specifically, when the S value of the serving cell is smaller than the preset threshold and the S value of the neighboring cell is larger than the preset threshold of the lower priority cell, the terminal uses the neighboring cell as the cell to camp on. When there are multiple cells with S values ​​larger than the preset threshold, the terminal selects the cell with the largest S value as the cell to camp on. The S value of the cell to camp on may be equal to the preset threshold of the lower priority cell.

[0151] For example, the S value is S rxlev and / or S. qual It may be. S rxlev and S qual For the specific calculation method of S, please refer to the above description. Details will not be described repeatedly in this specification. The step of comparing the S value with the preset threshold value of the lower priority cell in the cell measurement parameter set is specifically performed by comparing the S value with the threshold value Threshold included in the cell measurement parameter set. X,LowQ and S. rxlev and / or a threshold value included in the cell measurement parameter set, Threshold X,LowP and S. qual The method includes a step of comparing the

[0152] In the cell selection policy shown in Fig. 3, the terminal obtains polarization priority information distributed by the network device, and selects a polarization direction with a higher priority for cell measurement based on the polarization priority information to determine a cell to camp on. The network device indicates the priority of the polarization direction to ensure that the terminal considers multiple different polarization directions to select a more suitable cell to camp on. In this way, load balancing among multiple different polarization directions is implemented.

[0153] 5 is a schematic diagram of the interaction of cell selection policy and cell reselection policy according to one embodiment of this application. In this embodiment, a network device distributes multiple different cell measurement parameter sets for multiple different polarization directions of the same cell. The terminal calculates corresponding thresholds based on the cell measurement parameter sets corresponding to each of those polarization directions, and comprehensively determines a more suitable cell to camp on and the polarization direction of that cell to camp on with reference to the cell measurement result.

[0154] S501: A network device broadcasts a system message, and a terminal correspondingly receives the system message broadcast by the network device, the system message including a plurality of cell measurement parameter sets corresponding to a plurality of different polarization directions.

[0155] The cell measurement parameter set corresponding to the multiple different polarization directions includes parameters such as a reference R calculation parameter corresponding to the polarization directions, a preset S value threshold of a higher priority cell, and a preset S value threshold of a lower priority cell, etc. The cell measurement parameter set corresponding to the multiple different polarization directions may further include other parameters, which is not limited in this application.

[0156] The criterion R is used to determine the cell to camp on. For specific contents, please refer to the above description. In this specification, the details will not be described repeatedly.

[0157] For example, the S value is S rxlev and / or S. qual It may be. S rxlev and S qual For the specific calculation method of, please refer to the above description, and details will not be described in this specification.

[0158] The criteria R calculation parameters are the reselection hysteresis value Q of the current serving cell Hyst , offset value Q offset , and a temporary offset value Q offsettemp For example, the standard R calculation parameters corresponding to the LHCP are Q Hyst_LHCP , Q offset_LHCP , and Q offsettemp_LHCP The reference R calculation parameters corresponding to the RHCP may include Q Hyst_RHCP , Q offset_RHCP , and Q offsettemp_RHCP etc.

[0159] The preset S value threshold for higher priority cells is Threshold X,HighQ and / or Thresh X,HighP For example, the preset S value threshold for the higher priority cell corresponding to the LHCP is Threshold X_LHCP,HighQ and / or Thresh X_LHCP,HighP The preset S-value threshold of the higher priority cell corresponding to the RHCP may be Threshold. X_RHCP,HighQ and / or Thresh X_RHCP,HighP may include:

[0160] The preset S value threshold for lower priority cells is Threshold X,LowQ and / or Thresh X,LowPFor example, the preset S value threshold for lower priority cells corresponding to the LHCP is Threshold X_LHCP,LowQ and / or Thresh X_LHCP,LowP The preset S value threshold for the lower priority cell corresponding to the RHCP may be Threshold. X_RHCP,LowQ and / or Thresh X_RHCP,LowP It should be noted that the parameters corresponding to the different polarization directions may alternatively be represented in other ways, which is not a limitation in this application.

[0161] It should be noted that the cell priority information may be obtained from a system message SIB delivered by the current serving cell. For example, the cell priority information may be indicated by cellReselectionPriority carried in the SIB message, and the value of cellReselectionPriority is an integer ranging from 0 to 7. The larger the value of the parameter, the higher the cell priority. The cell priority may be determined by the cell load and power consumption, etc. Different vendors may use different algorithms to determine the cell priority, which is not limited in this application.

[0162] In one possible implementation, the network device broadcasts a plurality of measurement parameter sets corresponding to a plurality of different polarization directions for each of the one or more cells, and in response, the terminal receives a plurality of measurement parameter sets corresponding to a plurality of different polarization directions for each of the one or more cells broadcast by the network device.

[0163] It should be noted that the cell measurement parameters corresponding to the different polarization directions of a cell are determined by the load and power consumption in the different polarization directions of the cell. Different vendors may use different algorithms to determine the polarization priority. For example, when a cell has a larger load in the LHCP direction and a smaller load in the RHCP direction, a polarization priority of Q offset_LHCP and Q offsettemp_LHCP The offset value corresponding to the LHCP direction may be increased, for example, Q offset_RHCP and Q offsettemp_RHCP The offset value corresponding to the RHCP direction may be decreased.

[0164] S502: When the cell measurement condition is satisfied, the cell measurement is performed.

[0165] The cell measurement condition is that the terminal is in an initial access state or a connected state, that there is a neighboring cell whose cell priority is higher than the cell priority of the terminal's current serving cell, or Terminal and the serving cell of the UE satisfies a cell measurement enable threshold. For details, please refer to the contents in S302. Details will not be described in this specification.

[0166] When the cell measurement condition is met, the terminal performs the cell measurement and obtains the cell measurement result.

[0167] In one possible implementation, a terminal measures one or more cells and obtains measurement results corresponding to the one or more cells.

[0168] S503: Determine a cell to camp on based on the cell measurement result and the cell measurement parameter set.

[0169] After obtaining the cell measurement results, the terminal determines a cell to camp on based on the cell measurement parameter sets corresponding to a plurality of different polarization directions and the measurement results obtained from the broadcast message. Specifically, the terminal calculates a plurality of thresholds corresponding to a plurality of different polarization directions based on the cell measurement results and the cell measurement parameter sets corresponding to each polarization direction, and determines a cell and a polarization direction to camp on based on the thresholds.

[0170] In one possible implementation, the terminal acquires a plurality of measurement parameter sets corresponding to a plurality of different polarization directions for each of one or more cells, and determines a cell and polarization direction to camp on based on the plurality of measurement parameter sets corresponding to a plurality of different polarization directions for each of the one or more cells and the measurement results for each of the one or more cells.

[0171] When the neighboring cells are intra-frequency cells or inter-frequency cells having the same priority, the terminal obtains an R value for each of the one or more cells based on the cell measurement results and a plurality of cell measurement parameter sets corresponding to a plurality of different polarization directions of the cells, and determines a cell to camp on and a polarization direction of the cell to camp on based on the R values ​​in the plurality of different polarization directions of the one or more cells.

[0172] For example, two R values ​​corresponding to LHCP and RHCP are obtained for each cell, respectively. When the reference R is used to determine a cell to camp on, the larger R value among multiple polarization directions of neighboring cells is compared with the R value of the serving cell to determine the cell to camp on.

[0173] The signal quality Q of the current serving cell obtained by cell measurements meas,s , the reselection hysteresis value Q corresponding to the LHCP direction of the current serving cell included in the cell measurement parameter set Hyst_LHCP , and the standard R calculation parameter Q offsettemp_LHCPThe R value in the LHCP direction of the current serving cell may be obtained based on the signal quality Q of the current serving cell obtained by cell measurement. meas,s , the reselection hysteresis value Q corresponding to the RHCP direction of the current serving cell Hyst_RHCP , and the reference R calculation parameter Q included in the cell measurement parameter set offsettemp_RHCP The R value in the RHCP direction of the current serving cell may be obtained based on the signal quality Q of the neighboring cell obtained by cell measurement. meas,n , and the reference R calculation parameter Q included in the cell measurement parameter set offset_LHCP and Q offsettemp_LHCP Based on this, the R value in the LHCP direction of the neighboring cell may be obtained. meas,n , and the reference R calculation parameter Q included in the cell measurement parameter set offset_RHCP and Q offsettemp_RHCP The R value in the RHCP direction of the neighboring cell may be obtained based on the above. For the specific calculation method, please refer to the above description. In this specification, the details will not be described repeatedly.

[0174] The R value of the cell to be camped on must be equal to or greater than the R value of the current serving cell. Specifically, the terminal selects the cell with the largest R value as the cell to be camped on, and uses the polarization direction corresponding to the cell measurement parameters used when acquiring the R value as the polarization direction of the cell to be camped on, and the terminal selects the cell with the largest RSRP among the multiple neighboring cells whose R value is equal to or greater than the R value of the current serving cell as the cell to be camped on, and uses the polarization direction corresponding to the cell measurement parameters used when acquiring the R value as the polarization direction of the cell to be camped on, or the terminal selects the first neighboring cell whose R value is greater than the R value of the current serving cell as the cell to be camped on, and uses the polarization direction corresponding to the cell measurement parameters used when acquiring the R value as the polarization direction of the cell to be camped on. When both of 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 greater than the R value of the serving cell, the polarization direction corresponding to the larger R value is used as the polarization direction of the cell to be camped on.

[0175] In one possible implementation, when the R value of a neighboring cell is equal to the R value of the current serving cell, the terminal determines the neighboring cell as a cell to be camped on, and uses the polarization direction corresponding to the R value of the neighboring cell as the polarization direction of the cell to be camped on. 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 camp on the current serving cell. When the neighboring cell is a higher priority cell, the terminal obtains a plurality of S values ​​corresponding to the plurality of different polarization directions of each of one or more cells based on the measurement result of the cell and a plurality of cell measurement parameter sets corresponding to the plurality of different polarization directions of the cell, and compares the plurality of S values ​​with preset thresholds corresponding to the plurality of different polarization directions of the higher priority cell included in the cell measurement parameter set to determine the cell to be camped on. The S value of the cell to be camped on must be greater than the preset threshold. Specifically, when there are a plurality of cells with S values ​​greater than the preset threshold, the cell with the largest S value is selected as the cell to be camped on. The S value of the cell to camp on may be equal to a pre-set threshold value.

[0176] For example, for each cell, two S values ​​corresponding to LHCP and RHCP are obtained, and the cell to be camped on is determined by comparing the two S values ​​with preset thresholds of higher priority cells corresponding to multiple different polarization directions. For example, the S value is S rxlev and / or S. qual It may be. S rxlev and S qual For the specific calculation method of , please refer to the above description. The details will not be described repeatedly in this specification. The step of comparing the S value with the preset threshold value of the higher priority cell included in the cell measurement parameter set specifically includes comparing the S value with the threshold value Threshold corresponding to the LHCP included in the cell measurement parameter set. X_LHCP,HighQ and S corresponding to LHCP rxlevand / or a threshold value included in the cell measurement parameter set, Threshold X_LHCP,HighP and S. qual and comparing the RHCP with a threshold value Threshold corresponding to the RHCP included in the cell measurement parameter set. X_RHCP,HighQ and S corresponding to RHCP rxlev and / or a threshold value included in the cell measurement parameter set, Threshold X_RHCP,HighP and S. qual The method includes a step of comparing the

[0177] When the neighboring cell is a lower priority cell, the terminal obtains a plurality of S values ​​corresponding to the plurality of different polarization directions of each of one or more cells based on the measurement result of the cell and a plurality of cell measurement parameter sets corresponding to the plurality of different polarization directions of the cell, and compares the S values ​​with preset thresholds corresponding to the plurality of different polarization directions included in the cell measurement parameter set to determine the cell to camp on. Specifically, when the S value of the serving cell is smaller than the preset threshold and the S value of the neighboring cell is larger than the preset threshold of the lower priority cell, the terminal uses the neighboring cell as the cell to camp on. When there are a plurality of cells with S values ​​larger than the preset threshold, the terminal selects the cell with the largest S value as the cell to camp on. When the S value of the neighboring cell is equal to the preset threshold of the lower priority cell, the terminal may use the neighboring cell as the cell to camp on, or the terminal continues to camp on the current serving cell.

[0178] For example, two S values ​​corresponding to the LHCP and RHCP of the serving cell are obtained, and the two S values ​​are compared with a preset threshold value. When both of the S values ​​corresponding to the two polarization directions are smaller than the preset threshold value, the S values ​​corresponding to the LHCP and RHCP of the neighboring cell are obtained, and the S values ​​are compared with preset threshold values ​​of cells with lower priority corresponding to multiple different polarization directions to determine the cell to camp on. The S value is S rxlev and / or S. qual It may be. S rxlev and S qual For the specific calculation method of S, please refer to the above description. Details will not be described repeatedly in this specification. The step of comparing the S values ​​with the preset thresholds of the lower priority cells included in the cell measurement parameter set specifically includes comparing the S values ​​with the thresholds Thresholds included in the cell measurement parameter set. X_LHCP,LowQ and S corresponding to LHCP rxlev and / or a threshold Threshold for lower priority cells included in the cell measurement parameter set. X_LHCP,LowP and S corresponding to LHCP qual and comparing the cell measurement parameter set with a threshold Threshold X_RHCP,LowQ and S corresponding to RHCP rxlev and / or a threshold Threshold for lower priority cells included in the cell measurement parameter set. X_RHCP,LowP and S corresponding to RHCP qual The method includes a step of comparing the

[0179] In the cell selection policy shown in Fig. 5, the network device distributes multiple different cell measurement parameter values ​​for multiple different polarization directions. In this way, the terminal can determine a more suitable cell and polarization direction to camp on when performing cell selection or cell reselection, and implement load balancing in multiple different polarization directions.

[0180] Figure 6 is a schematic diagram of interactions in a cell handover method according to an embodiment of this application. In this embodiment, when handover is triggered, the source network device sends polarization direction indication information of the target cell to the terminal, so that the terminal determines to access and camp on the target cell in the designated polarization direction according to the indication. This implements load balancing in multiple different polarization directions.

[0181] S601: Measurement Control and Reporting.

[0182] When the terminal is in a connected state, the first network device (such as the source gNB in ​​FIG. 6) transmits measurement control information to the terminal. In response, the terminal receives the measurement control information transmitted by the first network device. The measurement control information indicates a configuration related to measurement control.

[0183] The measurement control information is a unicast message, ie a user-specific (UE-specific) message.

[0184] In one possible implementation, the measurement control information includes polarization preference information.

[0185] In one possible embodiment, the polarization priority information includes polarization priority information corresponding to the LHCP and the RHCP, and a number of different polarization directions correspond to a number of different values ​​of the priority information, where a larger value may indicate a higher priority or a smaller value may indicate a lower priority.

[0186] In another possible implementation, the polarization priority information indicates a polarization direction with a higher priority. Specifically, the polarization priority information includes an identifier corresponding to an LHCP or an identifier corresponding to an RHCP. Alternatively, the network device and the terminal may agree in advance to use "1" to represent an RHCP and "0" to represent an LHCP. If the priority corresponding to an RHCP is higher, the value of the bit corresponding to the polarization priority is 1. If the priority corresponding to an LHCP is higher, the value of the bit corresponding to the polarization priority is 0. Alternatively, "1" may be used to represent an LHCP, and "0" may be used to represent an LHCP. This is not limited in this application.

[0187] In one possible implementation, the network device delivers the measurement control information by using RRC signaling, for example, the network device delivers the measurement control information by using an RRC Connection Reconfiguration message.

[0188] After obtaining the measurement control information, the terminal performs cell measurement according to an associated configuration indicated by the measurement control information, specifically, the terminal performs cell measurement in a polarization direction with a higher polarization priority.

[0189] The terminal performing cell measurement specifically includes the terminal measuring the RSRP, the reference signal received quality (RSRQ), or the signal to interference plus noise ratio (SINR) of the current cell and the neighboring cell.

[0190] When the measurement reporting condition is satisfied, the terminal reports the measurement result to the first network device by using an event. In response, the first network device receives the measurement result. The measurement reporting condition is the same as the measurement reporting condition in the prior art. The details are not repeated in this specification.

[0191] S602: Handover decision.

[0192] The first network device performs an evaluation based on the measurement results reported by the terminal and decides whether to trigger a handover or not.

[0193] S603: Handover request.

[0194] If the result of the handover decision is to perform a cell handover, the first network device sends a handover request to a second network device (such as the target gNB in ​​FIG. 6). In response, the second network device receives the handover request sent by the first network device.

[0195] S604: Admission control.

[0196] After receiving the handover request, the second network device performs admission control and radio resource configuration.

[0197] S605: Handover request acknowledgement.

[0198] After completing the admission and radio resource configuration, the second network device feeds back a handover request acknowledgement message to the first network device, and correspondingly, the first network device receives the handover request acknowledgement message sent by the second network device.

[0199] S606: Trigger handover.

[0200] After receiving the handover request acknowledgement message sent by the second network device, the first network device triggers a handover.

[0201] In the handover trigger process, the first network device sends a handover command to the terminal. In response, the terminal receives the handover command sent by the first network device. The handover command includes information related to the terminal's access to the second network device.

[0202] In one possible implementation, in the case of a polarization multiplexing scenario, the handover command includes instruction information indicating a polarization direction of the target cell that the terminal should access. The terminal determines based on the instruction information that the terminal needs to access and camp on the target cell in the specified polarization direction. For example, if the instruction information indicates LHCP, the terminal accesses and camps on the target cell in the left circular polarization direction. If the instruction information indicates RHCP, the terminal accesses and camps on the target cell in the right circular polarization direction.

[0203] It should be noted that the polarization direction indicated in the handover command is determined by the loading, power consumption etc. in different polarization directions of the target cell.

[0204] In one possible implementation, the indication information is carried in an RRC message. Alternatively, the indication information may be carried in another user-specific (UE-specific) message, which is not a limitation in this application.

[0205] The handover command further includes an identifier of the target cell, a Cell Access Radio Network Temporary Identifier (C-RNTI) of the terminal, and a random access resource, etc. The handover command may further include other information, which is not limited in this application.

[0206] S607: Perform cell handover.

[0207] After triggering the cell handover, the first network device executes the cell handover. The specific procedure is similar to the existing cell handover process. For example, the terminal detaches from the source cell and establishes synchronization with the target cell, the first network device delivers user data to the second network device, the user data including both buffered user data and in-transmission user data, the second network device buffers the user data, the terminal establishes synchronization with the target cell, and completes the handover procedure.

[0208] In the above embodiment, the measurement control information delivered by the network device carries polarization priority information and / or indicates the polarization direction of the target cell to the terminal in the cell handover process, which achieves load balancing among multiple different polarization directions.

[0209] The above description describes several method embodiments provided by this application. Several embodiments of this application add a polarization dimension to the cell selection policy. In this way, it is possible to add a physical dimension for cell selection, optimize the existing cell selection policy / cell reselection policy, and ensure that the terminal determines a more suitable cell to camp on.

[0210] To implement the functions in the above methods provided by the embodiments of this application, the terminal devices and network devices may include hardware configurations and / or software modules, and the terminal devices and network devices implement the above functions in the form of a hardware configuration, a software module, or a combination of a hardware configuration and a software module. Whether a particular function among the above functions is performed by a hardware configuration, a software module, or a combination of a hardware configuration and a software module depends on the specific applications and design constraints of the technical solutions.

[0211] Based on the same technical concept, an embodiment of this application further provides a communication device 700, as shown in FIG. 7. The communication device 700 may be a terminal device or a network device, an apparatus in a terminal device or a network device, or an apparatus that can be used with a terminal device and a network device. In one possible implementation, the communication device 700 may include modules or units that correspond one-to-one to the methods / operations / steps / actions performed by the terminal in the above method embodiments. These units may be hardware circuits or software, or may be implemented by a hardware circuit associated with software. In one possible implementation, the communication device 700 may include a processing unit 710 and a transceiver unit 720. The processing unit 710 may be configured to call the transceiver unit 720 to perform a receiving function and / or a transmitting function.

[0212] When the communication device 700 is configured to perform a terminal-executed operation, the transceiver unit 720 is configured to obtain polarization priority information of one or more cells. The processing unit 710 is configured to perform cell measurements on the one or more cells based on the polarization priority information when a cell measurement condition is satisfied, and determine a cell to camp on based on the measurement result of the one or more cells.

[0213] When the communication device 700 is configured to perform an operation performed by a network device, the processing unit 710 is configured to determine polarization priority information. The transceiver unit 720 is configured to transmit a first message to a terminal. The first message includes polarization priority information. The polarization priority information is information for performing cell measurement when a cell measurement condition is satisfied, and obtaining a cell measurement result. The cell measurement result is a measurement result for selecting a cell on which the communication device should camp.

[0214] The transceiver unit 720 is further configured to perform other receiving or transmitting steps or operations performed by the terminal and the network device in the above method embodiments. The processing unit 710 may be further configured to perform corresponding steps or operations other than receiving or transmitting performed by the terminal and the network device in the above method embodiments. Details will not be described repeatedly in this specification.

[0215] The division into multiple modules in the multiple embodiments of this application is one example and is merely a logical division of functions, and other divisions may be used in actual implementation. In addition, multiple functional modules or units in the multiple embodiments of this application may be integrated into one processor, and each of the multiple modules or units may exist physically alone, or two or more of the multiple modules or units may be integrated into one module. The integrated modules or units may be implemented in the form of hardware or software functional modules.

[0216] As shown in FIG. 8, an embodiment of this application provides a communication device 800 configured to implement functions of a terminal device and a network device in the above-mentioned manners. The communication device may be a terminal device or a network device, an apparatus in a terminal device or a network device, or an apparatus that can be used with a terminal device and a network device. The communication device 800 may be a chip system. In this embodiment of this application, the chip system may include a chip, or may include a chip and other individual components. The communication device 800 includes at least one processor 810 configured to implement functions of a terminal device and a network device in the manners provided by the embodiments of this application. The communication device 800 may further include a communication interface 820. In the embodiments of this application, the communication interface may be a transceiver, a circuit, a bus, a module, or other types of communication interface, and is configured to communicate with other devices via a transmission medium. For example, the communication interface 820 is an interface for communication between an apparatus in the communication device 800 and other devices.

[0217] The processor 810 may perform multiple functions performed by the processing unit 710 in the communications device 700. The communications interface 820 may be configured to perform multiple functions performed by the transceiver unit 720 in the communications device 700.

[0218] When the communication device 800 is configured to perform a terminal-executed operation, the communication interface 820 is configured to obtain polarization priority information of one or more cells. The processor 810 is configured to perform cell measurements on the one or more cells based on the polarization priority information when a cell measurement condition is satisfied, and determine a cell to camp on based on the measurement results of the one or more cells.

[0219] When the communication device 800 is configured to perform an operation performed by a network device, the processor 810 is configured to determine polarization priority information. The communication interface 820 is configured to send a first message to a terminal. The first message includes the polarization priority information. The polarization priority information is information for performing cell measurement when a cell measurement condition is satisfied, and obtaining a cell measurement result. The cell measurement result is a measurement result for selecting a cell on which the communication device should camp.

[0220] The communication interface 820 is further configured to perform other receiving or transmitting steps or operations performed by the terminal and the network device in the above method embodiments. The processor 810 may be further configured to perform corresponding steps or operations other than receiving and transmitting steps or operations performed by the terminal and the network device in the above method embodiments. Details will not be described repeatedly in this specification.

[0221] The communication device 800 may further include at least one memory 830 configured to store program instructions and / or data. The memory 830 is coupled to the processor 810. The coupling in this embodiment of the application is a non-direct coupling or communication connection between the devices, units, or modules, which may be an electrical coupling, a mechanical coupling, or other form of coupling, used for information exchange between the devices, units, or modules. The processor 810 The at least one memory may operate in cooperation with the memory 830. The processor 810 may execute program instructions stored in the memory 830. In one possible implementation, at least one of the at least one memories may be integrated with the processor. In another possible implementation, the memory 830 is located outside the communications device 800.

[0222] In this embodiment of the application, the specific connection medium between the communication interface 820, the processor 810, and the memory 830 is not limited. In this embodiment of the application, the memory 830, the processor 810, and the communication interface 820 are connected by a bus 840 in FIG. 8, which is represented by a thick line in FIG. 8. The connection modes between the multiple other components are only described roughly and are not limited to those connection modes. The bus may be classified into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is used to represent the bus in FIG. 8, but this does not mean that only one bus or only one type of bus exists.

[0223] In this embodiment of the application, the processor 810 may be one or more central processing units (CPUs). When the processor 810 is a 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 device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the application. The general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the methods disclosed in the embodiments of the application may be directly implemented by a hardware processor, or may be executed by using a combination of hardware and software modules in the processor.

[0224] In this embodiment of the application, the memory 830 may be, but is not limited to, a non-volatile memory 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 compactIt may also include a read-only memory (Compact Disc Read-Only Memory, CD-ROM), etc. Memory is any other medium capable of carrying or storing expected program code, in the form of, but not limited to, instruction structures or data structures, and accessible by a computer. Memory in the embodiments of this application may alternatively be a circuit or any other device capable of implementing a memory function and configured to store program instructions and / or data. Memory 830 is configured to store associated instructions and data.

[0225] As shown in FIG. 9, an embodiment of the present application further provides an apparatus 900, which is configured to implement the functions of the terminal device and the network device in the above methods. The apparatus 900 may be a communication device or a chip in the communication device. The communication device includes: The device includes 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, chip, or other integrated circuit capable of implementing the methods of this application.

[0226] At least one input / output interface 910 is configured to input or output a signal or data. For example, when the device is a terminal or is used in a terminal, the input / output interface 910 is configured to obtain a first message. The first message carries polarization priority information and / or a cell measurement parameter set. Using the method illustrated in FIG. 6 as an example, the input / output interface 910 may be further configured to output a cell measurement result to report the measurement result to a first network device. For example, when the device is a network device or is used in a network device, the input / output interface 910 is configured to send a first message to the terminal. The message carries polarization priority information and / or a cell measurement parameter set. Using the method illustrated in FIG. 6 as an example, the input / output interface 910 may be further configured to obtain a cell measurement result reported by the terminal.

[0227] The logic circuitry 920 is configured to perform some or all of the steps of any one of the methods provided by the embodiments of this application. The logic circuitry may implement functions implemented by the processing unit 710 in the device 700 and the processor 810 in the device 800.

[0228] When the communication device is a chip used in a terminal device, the chip in the terminal device implements the functions of the terminal device in the above method embodiments. The chip in the terminal device receives information from other modules (such as radio frequency modules or antennas) in the terminal device, and the information is transmitted to the terminal device by the network device. Alternatively, the chip in the terminal device transmits information to other modules (such as radio frequency modules or antennas) in the terminal device, and the information is transmitted to the network device by the terminal device.

[0229] When the communication device is a chip used in a network device, the chip in the network device implements the functions of the network device in the above method embodiments. The chip in the network device receives information from other modules (such as radio frequency modules or antennas) in the network device, and the information is transmitted to the network device by the terminal device. Alternatively, the chip in the network device transmits information to other modules (such as radio frequency modules or antennas) in the network device, and the information is transmitted to the terminal device by the network device.

[0230] Based on the same concept as the above method embodiments, an embodiment of this application further provides a computer-readable storage medium, which stores a computer program, which is executed by hardware (e.g., a processor) to implement some or all of the steps in any one of the methods executed by any of the devices in the embodiments of this application.

[0231] Based on the same concept as the above method embodiments, an embodiment of the present application further provides a computer program product including instructions, which, when executed by a computer, enable the computer to perform some or all of the steps of any one of the methods in the above aspects.

[0232] Based on the same concept as the concept of the above method embodiments, this application further provides a chip or chip system. The chip may include a processor. The chip may further include a memory (or storage module) and / or a transceiver (or communication module), or the chip is coupled to the memory (or storage module) and / or the transceiver (or communication module). The transceiver (or communication module) may be configured to assist the chip in wired and / or wireless communication, and the memory (or storage module) may be configured to store a program. The processor invokes the program to implement the operations performed by the terminal or network device in any one of the above method embodiments or possible implementations of the method embodiments. The chip system may include a chip, or may include other individual components such as a memory (or storage module) and / or a transceiver (or communication module) and a chip.

[0233] Based on the same concept as the above method embodiments, this application further provides a communication system. The communication system may include the above terminal and / or the above network device. The communication system may be configured to implement the operations performed by the terminal or the network device in the above method embodiments or any one of the multiple possible implementations of the method embodiments. For example, the communication system may have the configuration shown in FIG. 1 or FIG. 2.

[0234] Some or all of the above embodiments may be implemented by using software, hardware, firmware, or any combination thereof. When software is used to implement the embodiments, some or all of the embodiments may be implemented 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 into a computer and executed by the computer, they generate all or part of the procedures or functions according to the embodiments of this application. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wired (e.g., coaxial cable, optical fiber, or digital subscriber line) or wireless (e.g., infrared, radio, or microwave) methods. The computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or a data center that integrates one or more available media. The available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, or a magnetic tape), an optical medium (e.g., an optical disk), or a semiconductor medium (e.g., a solid-state drive). In the above embodiments, the descriptions of the embodiments have their own focus. For parts that are not described in detail in one embodiment, please refer to the related descriptions in other embodiments.

[0235] In the above embodiments, the descriptions of the embodiments have their own focus. For parts not described in detail in an embodiment, refer to the relevant descriptions in other embodiments.

[0236] It should be understood that in some of the embodiments provided by this application, the disclosed device may be implemented in other ways. For example, the described device embodiment is merely an example. For example, the division into multiple units is merely a logical division of functions, and in actual implementation, other divisions may be used. For example, multiple units or components may be combined or integrated into other systems, or some of the features may be ignored or not implemented. In addition, the shown or described mutual coupling or direct coupling or communication connection may be implemented by some of the interfaces. Indirect coupling or communication connection between multiple devices or multiple units may be implemented by electrical or other forms.

[0237] The units described as separate parts may or may not be physically separated, and the parts shown as units may or may not be physical units, may be located in one place, or may be distributed among multiple network units. Based on actual requirements, some or all of the units may be selected to achieve the objectives of the technical solutions of the embodiments.

[0238] When an integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, the integrated unit may be stored in a computer-readable storage medium. Based on such understanding, the technical solutions of this application may be essentially implemented in the form of a software product, or the part that contributes to the prior art or all or a part of the technical solutions. The software product is stored in a storage medium and includes some instructions, which instruct a computer device (which may be a personal computer, a server, a network device, etc.) to execute all or a part of the steps of the methods described in the embodiments of this application.

[0239] The above description is merely some of the specific implementations of this application, and is not intended to limit the scope of protection of this application. Those skilled in the art can change and modify these embodiments within the technical scope disclosed in this application. Therefore, the following claims are intended to be interpreted to include the above embodiments and to show the changes and modifications that belong to the scope of this application. Therefore, the scope of protection of this application shall be according to the scope of protection of the invention described in the claims.

Claims

1. A communication method applied to a terminal, comprising: receiving a handover command, the handover command including an indication of a polarization direction of a target cell to be accessed by the terminal; and performing a cell handover based on the handover command; the handover command is issued by a network device in response to a result of a cell measurement reported by the terminal, the cell measurement being performed by the terminal based on polarization priority information included in a measurement control message received from the network device. method.

2. The method of claim 1 , wherein the indication information is carried in a radio resource control (RRC) message.

3. The method according to claim 1 or 2, wherein the polarization priority information indicates a polarization direction having a higher priority.

4. The method of claim 3 , wherein the polarization priority information includes an identifier corresponding to left-hand circular polarization (LHCP) or right-hand circular polarization (RHCP).

5. The method according to any one of claims 1 to 4, wherein the measurement control message is a UE specific message.

6. The method according to any one of claims 1 to 5, wherein the measurement control message is carried in a Radio Resource Control (RRC) message.

7. A communication method applied to a network device, comprising: generating a handover command, the handover command including an indication of a polarization direction of a target cell that the terminal should access; sending the handover command to the terminal; the handover command is generated in response to a result of a cell measurement reported by the terminal, the cell measurement being performed by the terminal based on polarization priority information included in a measurement control message sent by the network device to the terminal. method.

8. The method of claim 7, wherein the indication information is carried in a radio resource control (RRC) message.

9. The method according to claim 7 or 8, wherein the polarization priority information indicates a polarization direction having a higher priority.

10. The method of claim 9 , wherein the polarization preference information includes an identifier corresponding to left-hand circular polarization (LHCP) or right-hand circular polarization (RHCP).

11. The method according to any one of claims 7 to 10, wherein the measurement control message is a UE specific message.

12. The method according to any one of claims 7 to 11, wherein the measurement control message is carried in a Radio Resource Control (RRC) message.

13. 1. A communication device, comprising: a transceiver unit configured to receive a handover command, the handover command including an indication of a polarization direction of a target cell that the communication device should access; and a processing unit configured to perform a cell handover based on the handover command; the handover command is issued by a network device in response to a result of a cell measurement reported by the communication device, and the processing unit is further configured to perform the cell measurement based on polarization priority information included in a measurement control message received from the network device via the transceiver unit. Communications equipment.

14. The communications device of claim 13, wherein the indication information is carried in a radio resource control (RRC) message.

15. 15. The communication device according to claim 13, wherein the polarization priority information indicates a polarization direction having a higher priority.

16. 16. The communication device of claim 15, wherein the polarization priority information includes an identifier corresponding to left-hand circular polarization (LHCP) or an identifier corresponding to right-hand circular polarization (RHCP).

17. 17. The communications device of claim 13, wherein the measurement control message is a UE specific message.

18. 18. The communications device of claim 13, wherein the measurement control message is carried in a Radio Resource Control (RRC) message.

19. 1. A communication device, comprising: A processing unit configured to generate a handover command, the handover command including an indication of a polarization direction of a target cell that the terminal should access; a transceiver unit configured to transmit the handover command; the handover command is generated in response to a result of a cell measurement reported by the terminal, and the transceiver unit is further configured to transmit a measurement control message including polarization priority information to be used for the cell measurement by the terminal. Communications equipment.

20. 20. The communications device of claim 19, wherein the indication information is carried in a radio resource control (RRC) message.

21. 21. The communication device according to claim 19, wherein the polarization priority information indicates a polarization direction having a higher priority.

22. 22. The communication device of claim 21, wherein the polarization priority information includes an identifier corresponding to left-hand circular polarization (LHCP) or an identifier corresponding to right-hand circular polarization (RHCP).

23. 23. The communications device of claim 19, wherein the measurement control message is a UE specific message.

24. 24. The communications device of claim 19, wherein the measurement control message is carried in a Radio Resource Control (RRC) message.

25. 1. A communications device including a processor, the processor configured to execute a computer program, the communications device, when executed, comprising: It is possible to carry out a method according to any one of claims 1 to 6, or Making it possible to carry out the method according to any one of claims 7 to 12, Communications equipment.

26. The communication device of claim 25 , further comprising a memory configured to store the computer program.

27. A computer-readable storage medium containing a computer program, the computer program, when executed by a computer, A method according to any one of claims 1 to 6 is carried out, or A computer readable storage medium on which the method of any one of claims 7 to 12 is performed.

28. A communication device including an input / output interface and logic circuitry, The input / output interface is configured to receive a measurement control message and a handover command; A communications device, the logic circuit being configured to perform cell measurements based on the measurement control message and to perform cell handover based on the handover command by using a method according to any one of claims 1 to 6.

29. A communication device including an input / output interface and logic circuitry, The logic circuit is configured to generate a measurement control message and a handover command by using a method according to any one of claims 7 to 12, the input / output interface is configured to output the measurement control message and the handover command; Communications equipment.

30. A communication system comprising a communication device according to any one of claims 13 to 18 or a communication device according to any one of claims 19 to 24.

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