Communication method, device and system

Abstract

The invention relates to a communication method, device and system. The terminal device receives a first message from a first network device, the first message comprising first configuration information for configuring at least one uplink resource, the at least one uplink resource corresponding to the at least one SSB, or at least one configuration information for configuring the at least one uplink resource corresponding to the at least one SSB. And the terminal equipment sends the first SR to the second network equipment in a first uplink resource in the at least one uplink resource, wherein the first uplink resource corresponds to the first SSB or the uplink resource configured by the configuration information corresponding to the first SSB. And the terminal equipment receives the PDCCH from the second network equipment by using the beam direction corresponding to the first SSB. And the terminal device releases the first configuration information or the at least one uplink resource. The terminal device releases at least one uplink resource, so that the at least one uplink resource can be used by others, thereby improving the resource utilization rate.

Description

Technical Field

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

[0002] The 4th generation (4G) long term evolution (LTE) communication system introduces a random access channel less (RACH-less) process, through which a terminal device can switch to a target cell without random access. In the random access-free process, the terminal device first receives a switching command from a source network device. If the switching command does not indicate an uplink resource to the terminal device, the terminal device can continue to detect a physical downlink control channel (PDCCH) from the target network device to send an RRC reconfiguration complete message to the target network device through the uplink resource scheduled by the PDCCH.

[0003] Currently, in the non-terrestrial networks (NTN) communication scenarios of the 5th generation (5G) communication system, the introduction of random-free access is also being considered. In the 5G system, signals may be transmitted through beams. During the random-free access process, the terminal device has not yet accessed the target network device, and the target network device does not know which beam direction the terminal device is in. Therefore, the PDCCH sent by the target network device may not be detected by the terminal device, resulting in the failure of random-free access. Summary of the invention

[0004] Embodiments of the present application provide a communication method, apparatus, and system for improving the success rate of random access-free terminal equipment.

[0005] In a first aspect, a first communication method is provided, which can be executed by a terminal device, or by other devices including terminal device functions, or by a chip system (or, chip) or other functional modules, which can realize the functions of the terminal device, and the chip system or functional module is, for example, set in the terminal device. The method includes: receiving a first message from a first network device, the first message is used to instruct the terminal device to switch from the first network device to a target cell under a second network device, the first message includes first configuration information, the first configuration information is used to configure at least one uplink resource, the at least one uplink resource is used to send a scheduling request SR, wherein the at least one uplink resource corresponds to at least one SSB, one SSB corresponds to one or more uplink resources, or the first configuration information includes at least one configuration information for configuring the at least one uplink resource, the at least one configuration information corresponds to at least one SSB, one SSB corresponds to one or more configuration information; a first uplink resource in the at least one uplink resource sends a first SR to the second network device, the first uplink resource is an uplink resource corresponding to the first SSB, or an uplink resource configured by the configuration information corresponding to the first SSB in the at least one configuration information; a PDCCH from the second network device is received using a beam direction corresponding to the first SSB; and the first configuration information or the at least one uplink resource is released.

[0006] In the embodiment of the present application, the uplink resource configured for sending a scheduling request (schedule request, SR) corresponds to the synchronization signal and physical broadcast channel (physical broadcast channel, PBCH) block (synchronizationsignal and PBCH block, SSB), or the configuration information for configuring the SR corresponds to the SSB, then the terminal device sends the SR to the target network device, and the target network device can determine the SSB selected by the terminal device according to the SR, thereby being able to use the beam direction corresponding to the SSB to send the PDCCH to the terminal device, so that the PDCCH can be received by the terminal device, thereby improving the PDCCH reception success rate, thereby improving the random access-free success rate. In addition, the terminal device can release the first configuration information or at least one uplink resource in a timely manner, so that at least one uplink resource can be used by other terminal devices served by the target network device, which can reduce resource waste and improve resource utilization.

[0007] In an optional implementation, the first SSB is the SSB with the best signal quality measured by the terminal device, or the first SSB is one of the SSBs with signal quality greater than a first threshold measured by the terminal device. The terminal device can send the first SR by measuring and selecting an SSB with better signal quality to improve the success rate of sending the first SR.

[0008] In an optional implementation, releasing the first configuration information or the at least one uplink resource includes: releasing the first configuration information or the at least one uplink resource when or after receiving the PDCCH; or, sending an RRC reconfiguration completion message to the second network device, releasing the first configuration information or the at least one uplink resource when or after sending the RRC reconfiguration completion message; or, releasing the first configuration information or the at least one uplink resource when or after receiving a switching completion message from the second network device. The terminal device can release the first configuration information or the at least one uplink resource in different scenarios, which is more flexible.

[0009] In an optional implementation, the method further includes: sending first indication information to the second network device, the first indication information being used to indicate that the first configuration information or the at least one uplink resource has been released. After the terminal device releases the first configuration information or the at least one uplink resource, it can inform the second network device, and the second network device can schedule at least one uplink resource for other terminal devices to improve resource utilization.

[0010] In an optional implementation, the method further includes: determining the first SSB when or after receiving the first message; or, the first message further indicates a switching condition, and determining the first SSB when or after the switching condition is met. The terminal device may perform the process of determining the first SSB according to different situations to meet the switching requirements.

[0011] In an optional implementation, the first message further indicates a parameter for the terminal device to perform random access-free switching, and / or the first message further includes second indication information, the second indication information being used to instruct the terminal device to perform random access-free switching. The first message may also indicate more information so that the terminal device can obtain more information.

[0012] In an optional implementation, the first message is an RRC reconfiguration message. Or the first message may also be other RRC messages.

[0013] In a second aspect, a second communication method is provided, which can be executed by a second network device, or by other devices including the functions of the second network device, or by a chip system (or, chip) or other functional module, which can realize the functions of the second network device, and the chip system or functional module is, for example, arranged in the second network device. The second network device is, for example, an access network device, which can be referred to as a second access network device, for example, one implementation of the second access network device is a base station. The method includes: receiving a first SR from a terminal device on a first uplink resource; determining a first SSB based on the first uplink resource; and sending a PDCCH to the terminal device using a beam direction corresponding to the first SSB.

[0014] In an optional implementation, the method further includes: sending a second message to the first network device, the second message being used to instruct the terminal device to switch from the first network device to the second network device, the second message including first configuration information, the first configuration information being used to configure at least one uplink resource, the at least one uplink resource being used to send an SR, the at least one uplink resource including the first uplink resource, wherein the at least one uplink resource corresponds to at least one SSB, one of which corresponds to one or more uplink resources, or the first configuration information including at least one configuration information for configuring the at least one uplink resource, the at least one configuration information corresponding to at least one SSB, one of which corresponds to one or more configuration information. For example, the second network device may send a second message to the first network device, so that the first network device may send a first message to the terminal device according to the second message.

[0015] In an optional implementation, determining a first SSB based on the first uplink resource includes: determining configuration information for configuring the first uplink resource based on the first uplink resource; and determining the first SSB corresponding to the configuration information.

[0016] In an optional embodiment, the method also includes: receiving first indication information from the terminal device, the first indication information is used to indicate that first configuration information or at least one uplink resource has been released, the first configuration information is used to configure the at least one uplink resource, the first configuration information includes configuration information for configuring the first uplink resource, and the at least one uplink resource includes the first uplink resource.

[0017] In an optional implementation, the second message further indicates parameters for the terminal device to perform random access-free switching, and / or the second message further includes second indication information, and the second indication information is used to instruct the terminal device to perform random access-free switching.

[0018] Regarding the technical effects brought about by the second aspect or various optional implementations, reference may be made to the introduction to the technical effects of the first aspect or corresponding implementations.

[0019] In a third aspect, a third communication method is provided, which can be executed by a terminal device, or by other devices including terminal device functions, or by a chip system (or, chip) or other functional module, which can realize the functions of the terminal device, and the chip system or functional module is, for example, set in the terminal device. The method includes: receiving a first message from a first network device, the first message indicating at least one beam, and the first network device is the source network device of the terminal device; when the measurement value of the first beam in the at least one beam is greater than or equal to the first threshold corresponding to the first beam, using the first beam direction to receive the PDCCH from the second network device, the second network device is the target network device of the terminal device.

[0020] In an embodiment of the present application, the network side can indicate at least one beam to the terminal device, and the terminal device can select a beam from the at least one beam, and the second network device can also send PDCCH to the terminal device through the beam, thereby improving the terminal device's success rate in receiving PDCCH, thereby improving the success rate of random access. In addition, the terminal device can further determine whether at least one beam is available. For example, the terminal device can determine whether to use at least one beam to detect PDCCH based on a threshold value, so that when the beam indicated by the network side cannot cover the terminal device, the terminal device can no longer use the beam to detect PDCCH, thereby reducing the power consumption of invalid detection of the terminal device.

[0021] In an optional implementation, the method further includes: sending an RRC reconfiguration completion message to the second network device, the RRC reconfiguration completion message including the index of the first beam; and receiving switching completion information from the second network device using the first beam direction. If the terminal device selects the first beam from at least one beam, the index of the first beam may be sent to the second network device, so that the second network device may subsequently use the first beam to send information to the terminal device, thereby improving the success rate of information reception by the terminal device.

[0022] In an optional embodiment, the method further includes: when there is no beam with a measurement value greater than a corresponding threshold in the at least one beam, initiating random access to the second network device, or sending an RRC re-establishment request message to the second network device or other network devices. If the beam indicated by the network side cannot cover the terminal device, the terminal device may no longer use the beam to detect the PDCCH, thereby reducing the power consumption of invalid detection of the terminal device. In addition, the terminal device can also promptly fall back to the random access process or initiate RRC re-establishment, thereby reducing the delay for the terminal device to access the network.

[0023] In an optional implementation, the measurement value of the first beam is used to indicate the signal quality corresponding to the first beam, and the first threshold is a signal quality threshold; or, the measurement value of the first beam is the distance between the reference position corresponding to the first beam and the position of the terminal device, and the first threshold is a distance threshold. The terminal device can use different types of parameters to determine whether the beam is available, which is more flexible.

[0024] In an optional implementation, the first message includes the first threshold, and the first threshold corresponds to the at least one beam; or, the first message includes at least one threshold, and the at least one threshold corresponds to the at least one beam one-to-one, wherein the at least one threshold includes the first threshold. At least one beam may use the same threshold, which helps to reduce the overhead of the first message. Alternatively, at least one beam may have its own corresponding threshold to improve the judgment accuracy.

[0025] In a fourth aspect, a fourth communication method is provided, which may be executed by a second network device, or by other devices including the function of the second network device, or by a chip system (or, chip) or other functional module, the chip system or functional module being capable of implementing the function of the second network device, the chip system or functional module being, for example, arranged in the second network device. The second network device is, for example, an access network device, which may be referred to as a second access network device, for example, one implementation of the second access network device is a base station. The method comprises: sending a PDCCH to a terminal device in at least one beam, the at least one beam being a beam indicated to the terminal device for cell switching, the second network device being the target network device of the terminal device; receiving an RRC reconfiguration completion message from the terminal device using a first beam direction in the at least one beam, the RRC reconfiguration completion message including an index of the first beam; and sending a switching completion message to the terminal device using the first beam direction.

[0026] In an optional implementation, the method further includes: sending a second message to a first network device, wherein the second message indicates the at least one beam, and the first network device is a source network device of the terminal device.

[0027] In an optional embodiment, the second message includes a first threshold, and the first threshold corresponds to the at least one beam; or, the second message includes at least one threshold, and the at least one threshold corresponds one-to-one to the at least one beam.

[0028] Regarding the technical effects brought about by the fourth aspect or various optional implementations, reference may be made to the introduction to the technical effects of the third aspect or corresponding implementations.

[0029] In a fifth aspect, a communication device is provided. The communication device may be a terminal device described in any one of the first to fourth aspects. The communication device has the functions of the terminal device. The communication device is, for example, a terminal device, or a larger device including a terminal device, or a functional module in a terminal device, such as a baseband device or a chip system. In an optional implementation, the communication device includes a baseband device and a radio frequency device. In another optional implementation, the communication device includes a processing unit (sometimes also referred to as a processing module) and a transceiver unit (sometimes also referred to as a transceiver module). The transceiver unit can implement a sending function and a receiving function. When the transceiver unit implements the sending function, it can be called a sending unit (sometimes also referred to as a sending module), and when the transceiver unit implements the receiving function, it can be called a receiving unit (sometimes also referred to as a receiving module). The sending unit and the receiving unit can be the same functional module, which is called a transceiver unit, and the functional module can implement a sending function and a receiving function; or, the sending unit and the receiving unit can be different functional modules, and the transceiver unit is a general term for these functional modules.

[0030] In an optional implementation, the transceiver unit (or, the receiving unit) is used to receive a first message from a first network device, the first message is used to instruct the terminal device to switch from the first network device to a second network device, the first message includes first configuration information, the first configuration information is used to configure at least one uplink resource, the at least one uplink resource is used to send a scheduling request SR, wherein the at least one uplink resource corresponds to at least one SSB, one SSB corresponds to one or more uplink resources, or the first configuration information includes at least one configuration information for configuring the at least one uplink resource, the at least one configuration information corresponds to at least one SSB, one SSB corresponds to one or more configuration information; the transceiver unit (or, the sending unit) is used to send a first SR to the second network device from a first uplink resource in the at least one uplink resource, the first uplink resource is an uplink resource corresponding to the first SSB, or an uplink resource configured by the configuration information corresponding to the first SSB in the at least one configuration information; the transceiver unit (or, the receiving unit) is also used to receive a PDCCH from the second network device using a beam direction corresponding to the first SSB; the processing unit is used to release the first configuration information or the at least one uplink resource.

[0031] In an optional embodiment, the transceiver unit (or, the receiving unit) is used to receive a first message from a first network device, the first message indicates at least one beam, and the first network device is the source network device of the terminal device; the transceiver unit (or, the receiving unit) is used to receive a PDCCH from a second network device using the first beam direction when a measurement value of a first beam in the at least one beam is greater than or equal to a first threshold corresponding to the first beam, and the second network device is the target network device of the terminal device.

[0032] In an optional embodiment, the communication device also includes a storage unit (sometimes also referred to as a storage module), and the processing unit is used to couple with the storage unit and execute the program or instructions in the storage unit, so that the communication device can perform the functions of the terminal device described in any one of the first to fourth aspects above.

[0033] In a sixth aspect, a communication device is provided. The communication device may be the second network device described in any one of the first to fourth aspects. The communication device has the functions of the second network device. The communication device is, for example, a second network device, or a larger device including a second network device, or a functional module in the second network device, such as a baseband device or a chip system. In an optional implementation, the communication device includes a baseband device and a radio frequency device. In another optional implementation, the communication device includes a processing unit (sometimes also referred to as a processing module) and a transceiver unit (sometimes also referred to as a transceiver module). For the implementation of the transceiver unit, reference may be made to the introduction of the fifth aspect.

[0034] In an optional embodiment, the transceiver unit (or, the receiving unit) is used to receive a first SR from a terminal device on a first uplink resource; the processing unit is used to determine a first SSB based on the first uplink resource; the transceiver unit (or, the sending unit) is used to send a PDCCH to the terminal device using a beam direction corresponding to the first SSB.

[0035] In an optional embodiment, the transceiver unit (or, the sending unit) is used to send PDCCH to the terminal device in at least one beam, and the at least one beam is a beam indicated to the terminal device for cell switching, and the second network device is the target network device of the terminal device; the transceiver unit (or, the receiving unit) is used to receive an RRC reconfiguration completion message from the terminal device using a first beam direction in the at least one beam, and the RRC reconfiguration completion message includes an index of the first beam; the transceiver unit (or, the sending unit) is also used to send switching completion information to the terminal device using the first beam direction.

[0036] In an optional embodiment, the communication device also includes a storage unit (sometimes also referred to as a storage module), and the processing unit is used to couple with the storage unit and execute the program or instructions in the storage unit, so that the communication device can perform the function of the second network device described in any one of the first to fourth aspects above.

[0037] In a seventh aspect, a communication device is provided, which may be a terminal device, or a chip or chip system used in a terminal device. The communication device includes a communication interface and a processor, and optionally, a memory. The memory is used to store a computer program, and the processor is coupled to the memory and the communication interface. When the processor reads the computer program or instruction, the communication device executes the method executed by the terminal device in the above aspects.

[0038] In an eighth aspect, a communication device is provided, which may be a second network device, or a chip or chip system used in the second network device. The communication device includes a communication interface and a processor, and optionally, a memory. The memory is used to store a computer program, and the processor is coupled to the memory and the communication interface. When the processor reads the computer program or instruction, the communication device executes the method executed by the second network device in the above aspects.

[0039] In a ninth aspect, a communication system is provided, comprising a terminal device and a second network device, wherein the terminal device is used to execute the method executed by the terminal device as described in the above aspects, and the second network device is used to execute the method executed by the second network device as described in the above aspects. For example, the terminal device can be implemented by the communication device described in the fifth aspect or the seventh aspect; the second network device can be implemented by the communication device described in the sixth aspect or the eighth aspect.

[0040] Optionally, the communication system further includes a first network device, which is used to execute the method performed by the first network device in the above aspects. For example, the implementation of the first network device can refer to the communication device described in the sixth aspect or the eighth aspect.

[0041] In the tenth aspect, a fifth communication method is provided, which can be executed by the communication system described in the ninth aspect. The method includes: a first network device sends a first message to a terminal device, the first message is used to instruct the terminal device to switch from the first network device to a target cell under a second network device, the first message includes first configuration information, the first configuration information is used to configure at least one uplink resource, the at least one uplink resource is used to send an SR, wherein the at least one uplink resource corresponds to at least one SSB, one of which corresponds to one or more uplink resources, or the first configuration information includes at least one configuration information for configuring the at least one uplink resource, the at least one configuration information corresponds to at least one SSB, one of which corresponds to one or more configuration information; the terminal device receives the first configuration information A message is provided, in which a first uplink resource in the at least one uplink resource sends a first SR to the second network device, where the first uplink resource is an uplink resource corresponding to a first SSB, or an uplink resource configured by the configuration information corresponding to the first SSB in the at least one configuration information; the second network device receives the first SR from the terminal device in the first uplink resource, determines the first SSB according to the first uplink resource, and sends a PDCCH to the terminal device using the beam direction corresponding to the first SSB; the terminal device receives the PDCCH from the second network device using the beam direction corresponding to the first SSB; the terminal device releases the first configuration information or the at least one uplink resource.

[0042] In the eleventh aspect, a sixth communication method is provided, which can be performed by the communication system described in the ninth aspect. The method includes: a first network device sends a first message to a terminal device, the first message indicates at least one beam, and the first network device is the source network device of the terminal device; the second network device uses the at least one beam direction to send a PDCCH to the terminal device, and the second network device is the target network device of the terminal device; the terminal device receives the first message, and when there is a first beam in the at least one beam whose measured value is greater than or equal to the first threshold corresponding to the first beam, the first beam direction is used to receive the PDCCH from the second network device.

[0043] In a twelfth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium is used to store computer programs or instructions, and when the computer-readable storage medium is executed, the methods executed by the terminal device or the second network device in the above aspects are implemented.

[0044] In a thirteenth aspect, a computer program product comprising instructions is provided, which, when executed on a computer, enables the methods described in the above aspects to be implemented.

[0045] In a fourteenth aspect, a chip system is provided, comprising a processor and an interface, wherein the processor is used to call and execute instructions from the interface so that the chip system implements the above-mentioned methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 Flowchart for random access mechanism;

[0047] Figure 2A A schematic diagram of quasi-Earth fixation in the NTN scenario;

[0048] Figure 2B A schematic diagram of the movement of the earth in the NTN scenario;

[0049] Figure 3A and Figure 3B Schematic diagram of two communication network architectures used in embodiments of the present application;

[0050] Figures 4 to 6 Flowcharts of three communication methods provided in embodiments of the present application;

[0051] Figure 7 A schematic diagram of a device provided in an embodiment of the present application;

[0052] Figure 8 A schematic diagram of another device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0054] In the embodiments of the present application, the number of nouns, unless otherwise specified, means "singular noun or plural noun", that is, "one or more". "At least one" means one or more, and "plural" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. For example, A / B means: A or B. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c means: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, c can be single or multiple.

[0055] The ordinal numbers such as "first" and "second" mentioned in the embodiments of the present application are used to distinguish multiple objects, and are not used to limit the size, content, order, timing, priority or importance of multiple objects. For example, the first network device and the second network device can be the same network device or different network devices, and this name does not indicate the difference in configuration, location, application scenario, priority or importance of the two network devices. In addition, the numbering of the steps in the various embodiments introduced in this application is only to distinguish different steps, and is not used to limit the order between the steps. For example, S401 may occur before S402, or may occur after S402, or may occur at the same time as S402.

[0056] Below, some terms or concepts in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.

[0057] (1) In the embodiments of the present application, the terminal device is a device with wireless transceiver function, which can be a fixed device, a mobile device, a handheld device (such as a mobile phone), a wearable device, a vehicle-mounted device, or a wireless device built into the above device (such as a communication module, a modem, or a chip system, etc.). The terminal device is used to connect people, objects, machines, etc., and can be widely used in various scenarios, such as but not limited to the following scenarios: sensing scenarios, cellular communications, device-to-device communications (D2D), vehicle to everything (V2X), machine-to-machine / machine-type communications (M2M / MTC), Internet of Things (IoT), virtual reality (VR), augmented reality (AR), industrial control, self-driving, remote medical, smart grid, smart furniture, smart office, smart wearable, smart transportation, smart city, drones, robots and other scenarios. The terminal device may sometimes be referred to as user equipment (UE), terminal, access station, UE station, remote station, wireless communication device, or user device, etc.

[0058] In the embodiment of the present application, the communication device for implementing the function of the terminal device may be a terminal device, or may be a device capable of supporting the terminal device to implement the function, such as a chip system, which may be installed in the terminal device. In the technical solution provided in the embodiment of the present application, the technical solution provided in the embodiment of the present application is described by taking the device for implementing the function of the terminal device as an example, and the terminal device is used as an example. In addition, for the convenience of description, the terminal device is described in the embodiment of the present application by taking the UE as an example.

[0059] (2) The network equipment in the embodiments of the present application, for example, includes access network equipment and / or core network equipment. The access network equipment is a device with wireless transceiver function, which is used to communicate with the terminal device. The access network equipment includes but is not limited to base stations (base transceiver station (BTS), node B (Node B), evolved node B (eNodeB) / eNB, or next generation node B (the next generation nodeB, gNodeB) / gNB), transmission reception point (TRP), base station of subsequent evolution of the third generation partnership project (3GPP), access node in wireless fidelity (Wi-Fi) system, wireless relay node, wireless backhaul node, etc. The base station can be: macro base station, micro base station, micro-micro base station, small station, relay station, etc. Multiple base stations can support networks with the same access technology or networks with different access technologies. The base station can include one or more co-site or non-co-site transmission and reception points. The access network device may also be a wireless controller, a centralized unit (CU), and / or a distributed unit (DU) in a cloud radio access network (CRAN) scenario. The access network device may also be a server, etc. For example, the network device in the V2X technology may be a road side unit (RSU). The following describes the access network device using a base station as an example. A base station may communicate with a terminal device, or may communicate with a terminal device through a relay station. A terminal device may communicate with multiple base stations in different access technologies. The core network device is used to implement functions such as mobility management, data processing, session management, policy and billing. The names of the devices that implement the core network functions in systems with different access technologies may be different, and the embodiments of the present application do not limit this. Taking the 5G system as an example, the core network device includes: access and mobility management function (AMF), session management function (SMF), policy control function (PCF) or user plane function (UPF), etc.

[0060] In the embodiment of the present application, the communication device for realizing the function of the network device may be a network device, or may be a device capable of supporting the network device to realize the function, such as a chip system, which may be installed in the network device. In the technical solution provided in the embodiment of the present application, the technical solution provided in the embodiment of the present application is described by taking the device for realizing the function of the network device as an example that the network device is used as the device.

[0061] (3) No random access required.

[0062] The random access-free process is introduced in the 4G LTE communication system, through which the terminal device can switch to the target cell without random access. Figure 1 , which is a flow chart of the random access process.

[0063] S101. A source base station sends a handover command to a terminal device. Correspondingly, the terminal device receives the handover command from the source base station. The handover command may include an identifier of a target cell to instruct the terminal device to handover to the target cell.

[0064] The handover command may include random access-free configuration information. Optionally, the handover command may also include timing advance adjustment indication information and pre-configured uplink resource information.

[0065] In addition, before S101, the method may further include S102 and S103. When the source base station determines to switch the terminal device to the target base station, it may send a switching request to the target base station through S102 to request to switch the terminal device to the target base station. After receiving the switching request, the target base station may send a switching request confirmation to the source base station through S103 to determine to switch the terminal device to the target base station.

[0066] S104: The terminal device sends an RRC reconfiguration completion message to the target base station. Correspondingly, the target base station receives the RRC reconfiguration completion message from the terminal device.

[0067] Among them, if the handover command in S101 includes information about pre-configured uplink resources, the terminal device sends the RRC reconfiguration completion message to the target base station through the uplink resources. Alternatively, if the handover command in S101 does not include information about pre-configured uplink resources, before S104, the terminal device detects the PDCCH from the target base station (refer to S105), and the PDCCH can schedule uplink resources. When the PDCCH is detected, the terminal device sends the RRC reconfiguration completion message to the target base station according to the uplink resources scheduled by the PDCCH.

[0068] S106. The target base station sends a handover completion message (or a handover success message) to the terminal device. Correspondingly, the terminal device receives the handover completion message from the target base station. The handover completion message is, for example, a UE contention resolution identity MAC CE. When the terminal device receives the handover completion message, it determines that the handover is successful.

[0069] (4)NTN communication.

[0070] Satellite communications have the advantages of wide coverage, long communication distance, high reliability, high flexibility, and high throughput. They are not affected by geographical environment, climate conditions, and natural disasters, and have been widely used in aviation communications, maritime communications, military communications, and other fields. Introducing satellites into the 5G system can provide communication services for areas that are difficult for ground networks to cover, such as oceans and forests, and can enhance the reliability of 5G communications, such as providing more stable and high-quality communication services for trains, airplanes, and users on these vehicles. It can also provide more data transmission resources and support a greater number of connections. Thanks to the current concept of "any time, any place" communication, the status of satellite communication networks will be further enhanced in the future.

[0071] Generally speaking, the higher the satellite's orbit, the larger its coverage area, but the longer the communication delay. Generally speaking, the satellite's orbit can be divided into low-earth orbit (LEO), medium-earth orbit (MEO), and geostationary earth orbit (GEO) according to its altitude. LEO, orbit altitude is 160 kilometers (km) to 2000km; MEO, orbit altitude is 7000km to 25000km; GEO, orbit altitude is 35786km. The relative position of satellites operating in GEO and the earth is not affected by the earth's rotation. In addition, non-geosynchronous orbits (NGSO) include LEO with an altitude of about 300km to 1500km and MEO with an altitude of about 7000km to 25000km.

[0072] Quasi-geo-fixed: A beam or cell or satellite that can always cover a geographical area for a limited time, and after that time will cover another geographical area (for example, the case of NGSO satellites producing steerable beams). Figure 2A , satellite 1 can always cover a certain area on the earth during the time period from time T1 to time T3, and after time T3, satellite 1 will cover another area due to factors such as beam steering.

[0073] Geomobility: The beam or cell or area covered by a satellite slides across the surface of the Earth (e.g., in the case of a NGSO satellite producing a fixed or non-steerable beam). Figure 2B , satellite 1 covers area 1 at time T1, covers area 2 at time T2, and covers area 3 at time T3.

[0074] Currently, the introduction of random-free access is also being considered in NTN communication scenarios. In 5G systems, signals may be transmitted through beams. During the random-free access process, the terminal device has not yet accessed the target network device, and the target network device does not know which beam direction the terminal device is in. Therefore, the PDCCH sent by the target network device may not be detected by the terminal device, resulting in the failure of random-free access.

[0075] In view of this, the embodiment of the present application configures the uplink resource for sending SR to correspond to SSB, or the configuration information for configuring SR to correspond to SSB, then the UE sends SR to the target network device, and the target network device can determine the SSB selected by the UE based on the SR, thereby being able to use the beam direction corresponding to the SSB to send PDCCH to the UE, so that the PDCCH can be received by the UE, thereby improving the success rate of PDCCH reception, thereby improving the success rate of random access. In addition, the UE can release the configuration information for configuring SR or at least one uplink resource in a timely manner, so that at least one uplink resource can be used by other UEs served by the target network device, which can reduce resource waste and improve resource utilization.

[0076] The technical solution provided in the embodiments of the present application can be applied to a 5G system, such as an NTN scenario in a 5G system, or other scenarios in a 5G system; or it can also be applied to a next-generation mobile communication system or other similar communication systems, such as an NTN scenario or other scenarios of a sixth-generation mobile communication technology (the 6th generation, 6G) system, without specific limitation.

[0077] For reference Figure 3A and Figure 3B , which are two communication network architectures applicable to the embodiments of the present application. Figure 3A including UE and network device 1, Figure 3B It includes UE, network device 1 and network device 2. Among them, Figure 3A or Figure 3B The network device 1 in is the source network device of the UE, Figure 3A The network device 1 in is also the target network device of the UE. Figure 3B The network device 2 in is the target network device of the UE. That is, Figure 3AThe scenario shown is an intra-site handover, which is a handover from one cell to another cell of the same network device; Figure 3B The illustrated scenario is an inter-site handover scenario, which is a handover from a cell of network device 1 to a cell of network device 2. Figure 3A or Figure 3B The network device in the example is an access network device, such as a base station. Figure 3A or Figure 3B Any network device in the architecture may be an integrated architecture, or a distributed architecture, such as gNB-CU and gNB-DU, etc., without limitation.

[0078] Optionally, the network device 1 and / or the network device 2 can communicate with a satellite, or the network device 1 and / or the network device 2 is arranged on a satellite. Figure 3A and / or Figure 3B The scenario shown is the NTN scenario. Figure 3A and / or Figure 3B The scenario shown may also be a non-NTN scenario, for example, the network device 1 and / or the network device 2 is located on the ground, and communication with a satellite is not considered.

[0079] In order to better introduce the embodiments of the present application, the method provided by the embodiments of the present application is introduced below in conjunction with the accompanying drawings. The "using a certain beam to send (or, receive)" and "using a certain beam direction to send (or, receive)" described in the various embodiments of the present application can be replaced with each other. For example, "using the first beam to send (or, receive)" can also be replaced with "using the first beam direction to send (or, receive)". Among them, one beam corresponds to one direction, which can be called the beam direction of the beam.

[0080] Unless otherwise specified in the following text, the steps indicated by dashed lines in the accompanying drawings corresponding to the various embodiments of the present application are all optional steps. The methods provided in the various embodiments of the present application can be applied to Figure 3A or Figure 3B The network architecture shown, for example, the UE involved in each embodiment of the present application may be Figure 3A or Figure 3B UE in; the first network device described in each embodiment of the present application may be Figure 3A or Figure 3B The network device 1 in the embodiment of the present application may be Figure 3A Network device 1 in , or Figure 3B Network device 2 in.

[0081] This application embodiment provides a communication method, see Figure 4 , which is a flow chart of the method.

[0082] S401: A first network device sends a first message to a UE. Correspondingly, the UE receives the first message from the first network device.

[0083] The first message may instruct the UE to switch from the first network device to the target cell, or instruct the UE to switch from the first network device to the target cell under the second network device, or instruct the UE to switch from the source cell under the first network device to the target cell under the second network device. For example, the first message may include an identifier of the target cell, such as a physical cell identifier (PCI) of the target cell, and through the identifier of the target cell, the UE may be instructed to switch from the first network device to the target cell under the second network device. For example, the first message may also be referred to as a handover command. The first message is, for example, an RRC message, for example, an RRC reconfiguration message, or may be other RRC messages.

[0084] The first message may also include first configuration information, the first configuration information, for example, corresponding to the target cell under the second network device (i.e., the target cell to which the UE is switching this time), the first configuration information may be used to configure at least one uplink resource in the target cell, each uplink resource in the at least one uplink resource may be used by the UE to send an SR, for example, one uplink resource may be used to send an SR, so the first configuration information may also be referred to as SR configuration information. Wherein, the uplink resource used to send the SR may be a physical uplink control channel (PUCCH). Optionally, at least one uplink resource may correspond to at least one SSB, wherein one SSB may correspond to one or more uplink resources; or, the first configuration information may include at least one configuration information, wherein each configuration information is used to configure one uplink resource in at least one uplink resource, at least one configuration information corresponds to at least one uplink resource one-to-one, and at least one configuration information corresponds to at least one SSB, wherein one SSB may correspond to one or more configuration information. The above correspondence (or association) may be pre-configured by the network device, or pre-configured in the UE and the network device. That is, there may be a correspondence between the uplink resources used to send the SR and the SSB (or, the SR resources correspond to the SSB; or, the PUCCH resources corresponding to the SR correspond to the SSB), or there may be a correspondence between the configuration information used to configure the SR transmission resources and the SSB. Among them, the uplink resources correspond to the SSB, which may be the correspondence between the uplink resources and the index of the SSB; the configuration information corresponds to the SSB, which may be the correspondence between the configuration information and the index of the SSB.

[0085] Optionally, the first message may include other information in addition to the first configuration information. For example, the first message also includes one or more of the following information: parameters for random access-free switching, second indication information, PUCCH configuration information, or switching condition information. For example, the first message may include the second indication information and parameters for random access-free switching, and the second indication information may be used to indicate that the UE accesses the second network device in a random access-free manner (or, indicates that the UE skips the random access process), and the parameter is used for the UE to perform the corresponding configuration of random access-free switching; or, the first message may include parameters for random access-free switching without including the second indication information, and the parameters for random access-free switching may implicitly indicate that the UE accesses the second network device in a random access-free manner (or implicitly indicates that the UE skips the random access process). The PUCCH configuration information may be used to configure PUCCH resources, and the PUCCH resources configured by the PUCCH configuration information may be used to send uplink signals other than SR. If this handover is a conditional handover (CHO), the first message may include handover condition information, so that the UE can perform cell handover when the conditions indicated by the handover condition information are met.

[0086] Optionally, before S401, when the first network device determines that the UE is to be switched to the second network device, it may send a switching request to the second network device to request that the UE be switched to the second network device, or request that the UE be switched to the target cell under the second network device. After receiving the switching request, the second network device may send a switching request confirmation to the first network device to determine that the UE is switched to the second network device, or determine that the UE is switched to the target cell under the second network device. The switching request confirmation is, for example, a second message, and the first network device may determine the first message based on the second message. One determination method is that the second message and the first message are the same message, that is, the first network device may forward the second message to the UE; another determination method is that the first network device may obtain the first message based on the second message, for example, the first network device adds part or all of the content included in the second message (for example, part or all of the containers in the second message) to the first message. Optionally, the second message may include the first configuration information and may also include other information. For example, the second message may also include one or more of the following information: parameters for random access-free switching, second indication information, PUCCH configuration information, or switching condition information, etc., without limitation.

[0087] S402: The UE sends a first SR to the second network device using a first uplink resource in at least one uplink resource. Correspondingly, the second network device receives the first SR on the first uplink resource. The second network device may perform detection on at least one uplink resource to receive the SR from the UE.

[0088] If the first message does not include the switching condition information, the UE may select the SSB when or after receiving the first message, for example, the UE selects the first SSB. For example, the second network device may broadcast the SSB periodically, and the UE may measure one or more SSBs from the second network device and select the SSB with the best measurement result, for example, the first SSB; or, the UE may randomly select a measurement result from the measurement results greater than or equal to the first threshold, and determine the SSB corresponding to the measurement result, for example, the first SSB. The measurement result may characterize the signal quality, for example, the measurement result is a reference signal receiving power (RSRP), or a reference signal receiving quality (RSRQ), or a signal to interference plus noise ratio (SINR). The UE may use a layer 1 (L1) measurement method or a layer 3 (L3) measurement method without limitation. The first threshold may be configured by the first network device or the second network device, or preconfigured in the UE, or predefined by a protocol, or set by the UE itself.

[0089] Alternatively, if the first message includes switching condition information, the UE may select the SSB when the condition indicated by the switching condition information is met or after the condition indicated by the switching condition information is met, and the time when the condition is met may be the time when the UE receives the first message, or may also be after the UE receives the first message. The UE selects the SSB when or after the condition indicated by the switching condition information is met, and the selection process may refer to the introduction in the previous paragraph.

[0090] If there is a correspondence between the configuration information used to configure the SR transmission resource and the SSB, then after determining the first SSB, the UE can determine the configuration information corresponding to the first SSB, for example, the first SSB corresponds to configuration information A in at least one configuration information included in the first configuration information, and configuration information A configures the first uplink resource, then the UE can send the first SR to the second network device in the first uplink resource. Alternatively, if there is a correspondence between the uplink resource used to send the SR and the SSB, then after determining the first SSB, the UE can determine the uplink resource corresponding to the first SSB, for example, the first SSB corresponds to the first uplink resource in at least one uplink resource, then the UE can send the first SR to the second network device in the first uplink resource.

[0091] S403: The second network device sends a PDCCH to the UE using the beam direction corresponding to the first SSB. Correspondingly, the UE receives the PDCCH from the second network device using the beam direction corresponding to the first SSB.

[0092] After receiving the first SR, the second network device may determine the first SSB in the opposite process of the UE determining the first uplink resource based on the first SSB. For example, if there is a correspondence between the configuration information for configuring the SR transmission resource and the SSB, then after determining the first SSB, the UE determines the configuration information A corresponding to the first SSB, and the configuration information A configures the first uplink resource. The UE can send the first SR to the second network device on the first uplink resource; when or after receiving the first SR, the second network device can determine the first uplink resource for receiving the first SR, and further determine that the configuration information A for configuring the first uplink resource corresponds to the first SSB, and the second network device determines the first SSB.

[0093] For another example, if there is a corresponding relationship between the uplink resources used to send SR and SSB, after determining the first SSB, the UE can determine that the uplink resource corresponding to the first SSB is the first uplink resource, and the UE can send the first SR to the second network device on the first uplink resource; when or after receiving the first SR, the second network device can determine the first uplink resource for receiving the first SR, and further determine that the first uplink resource corresponds to the first SSB, and the second network device has determined the first SSB.

[0094] After determining the first SSB, the second network device can use the beam direction corresponding to the first SSB to send the PDCCH to the UE. Because the UE can use the beam direction corresponding to the first SSB to send the first SR to the second network device, the UE can naturally use the beam direction corresponding to the first SSB to receive the downlink signal, thereby improving the PDCCH reception success rate, thereby improving the UE's random access success rate.

[0095] Optionally, the method may further include S404, the UE sending an RRC reconfiguration completion message to the second network device on the second uplink resource. Correspondingly, the second network device receives the RRC reconfiguration completion message from the UE on the second uplink resource. For example, when the first message is an RRC reconfiguration message, the UE may execute S404 as a response to the RRC reconfiguration message. The second uplink resource is an uplink resource scheduled by the PDCCH.

[0096] Wherein, if the first message does not include the switching condition information, the UE may start a timing advance timer (TAT) when receiving the first message or after receiving the first message. Alternatively, if the first message includes the switching condition information, the UE may start the TAT when receiving the first message or after receiving the first message, or may start the TAT when sending the first SR or after sending the first SR, or may start the TAT when receiving the PDCCH from the second network device or after receiving the PDCCH from the second network device. The TAT may be used to maintain uplink synchronization between the UE and the second network device.

[0097] S405: The UE releases the first configuration information, or releases at least one uplink resource.

[0098] Optionally, the UE may execute S405 when or after receiving the PDCCH, then S405 occurs after S403, and S405 may occur before S404, or occur simultaneously with S404, or occur after S404. When the UE releases the at least one uplink resource when or after receiving the PDCCH, the resource can be released earlier, so that it can be used for other purposes as soon as possible, which can better improve the resource shortage situation.

[0099] Alternatively, the UE may execute S405 when sending the RRC reconfiguration completion message to the second network device, or execute S405 when the RRC reconfiguration completion message is completely sent, or execute S405 after the RRC reconfiguration completion message is completely sent, and S405 may occur after S404, or simultaneously with S404. The UE sends the RRC reconfiguration completion message to the second network device, indicating that the cell switching of the UE has been completed, and the UE may no longer use the at least one uplink resource at this time, so the UE may release the at least one uplink resource in time so that these resources can be used for other purposes in time.

[0100] Alternatively, the UE may execute S405 when or after receiving the switching completion information from the second network device. Optionally, after receiving the RRC reconfiguration completion message in S404, the second network device may also send a switching completion message to the UE to indicate that the cell switching is completed or the switching is successful. Then the UE may execute S405 when or after receiving the switching completion information. Then S405 may occur after S404. The UE receives the switching completion information from the second network device, and it can be determined that the cell switching on the UE side and the network side has been completed or successful, so there is no need to use the at least one uplink resource. At this time, the behavior of releasing the at least one uplink resource will be more reliable, which can not only improve resource utilization, but also avoid the UE having no resources available when the UE needs to continue to use the at least one uplink resource because the resources have been released.

[0101] Optionally, the method may further include S406, the UE sends first indication information to the second network device, and correspondingly, the second network device receives the first indication information from the UE. The first indication information may indicate that the first configuration information has been released, or indicate that at least one uplink resource has been released. After the second network device receives the first indication information, it can be clear that the at least one uplink resource has been released, and the second network device can use the at least one uplink resource for other purposes, such as scheduling it for other UEs to use, which can improve resource utilization and will not affect the UE's use of the at least one uplink resource.

[0102] In the embodiment of the present application, the uplink resource used to send the SR is configured to correspond to the SSB, or the configuration information used to configure the SR corresponds to the SSB. Then, the UE sends the SR to the target network device, and the target network device can determine the SSB selected by the UE based on the SR, thereby being able to use the beam direction corresponding to the SSB to send the PDCCH to the UE, so that the PDCCH can be received by the UE, thereby avoiding the situation where the PDCCH sent by the target network device cannot be detected by the UE, thereby improving the PDCCH reception success rate, thereby improving the success rate of random access. In addition, the UE can release the first configuration information or at least one uplink resource in a timely manner, so that at least one uplink resource can be used by other UEs served by the target network device, which can reduce resource waste and improve resource utilization.

[0103] This application embodiment provides another communication method, see Figure 5 , which is a flow chart of the method.

[0104] S501: A first network device sends a first message to a UE. Correspondingly, the UE receives the first message from the first network device.

[0105] The first message may instruct the UE to switch from the first network device to the target cell, or instruct the UE to switch from the first network device to the target cell under the second network device, or instruct the UE to switch from the source cell under the first network device to the target cell under the second network device. For example, the first message may include an identifier of the target cell, such as the PCI of the target cell, and through the identifier of the target cell, the UE may be instructed to switch from the first network device to the target cell under the second network device. For example, the first message may also be referred to as a handover command. The first message is, for example, an RRC message, and the RRC message is, for example, an RRC reconfiguration message, or may be other RRC messages.

[0106] The first message may also include information about at least one beam in the target cell under the second network device (i.e., the target cell to which the UE is switching this time), for example, including the index of at least one beam, or including the index of at least one SSB corresponding to at least one beam, where the beam and the SSB correspond one to one, for example. This is equivalent to the network side selecting at least one beam in the target cell for the UE, so that the second network device can send a PDCCH to the UE in the at least one beam. The at least one beam is, for example, a partial beam in the target cell.

[0107] Optionally, the first message may further include one or more of the following information: a parameter for random access-free switching, a second indication information, at least one reference location information, or a first threshold or at least one threshold. For the parameter for random access-free switching and the second indication information, refer to Figure 4Related introduction to the illustrated embodiments. A first threshold or at least one threshold may be used to determine whether a beam is available. The first message may include a first threshold, which corresponds to at least one beam, or the first threshold may be applicable to at least one beam. Alternatively, the first message may include at least one threshold, at least one threshold corresponds to at least one beam, and one threshold may correspond to one or more beams. For example, at least one threshold includes a first threshold, and the first threshold may correspond to a first beam in at least one beam. The first threshold is, for example, a signal quality threshold, such as an RSRP threshold, an RSRQ threshold, or an SINR threshold. Alternatively, the first threshold may also be a distance threshold.

[0108] For example, if the first message includes a first threshold value, and the first threshold value is a distance threshold value, the first message may also include at least one reference location information, and the at least one reference location information may indicate at least one reference location, and the at least one reference location corresponds to at least one beam, and one reference location may correspond to one or more beams. For example, beams corresponding to the same reference location may correspond to the same threshold value or different threshold values.

[0109] For another example, if the first message includes at least one threshold, then the at least one threshold may be a signal quality threshold or a distance threshold. For example, if the at least one threshold is a distance threshold, then the first message may also include at least one reference location information, and the at least one reference location information may indicate at least one reference location, and at least one reference location corresponds to at least one beam, and one reference location may correspond to one or more beams.

[0110] Alternatively, the first threshold or at least one threshold may also not be included in the first message. For example, the second network device may broadcast the first threshold or at least one threshold, and the UE may also receive the first threshold or at least one threshold. Optionally, if the second network device broadcasts the first threshold, and the first threshold is a distance threshold, the second network device may also broadcast the at least one reference location information. Alternatively, if the second network device broadcasts the at least one threshold, and the at least one threshold is a distance threshold, the second network device may also broadcast the at least one reference location information.

[0111] Optionally, before S501, when the first network device determines that the UE is to be switched to the second network device, the first network device may send a switching request to the second network device to request that the UE be switched to the second network device, or request that the UE be switched to the target cell under the second network device. After receiving the switching request, the second network device may send a switching request confirmation to the first network device to determine that the UE is switched to the second network device, or determine that the UE is switched to the target cell under the second network device. Among them, the switching request confirmation is, for example, a second message, for example, the first network device can determine the first message according to the second message. One determination method is that the second message and the first message are the same message, that is, the first network device can forward the second message to the UE; another determination method is that the first network device can obtain the first message according to the second message, for example, the first network device adds part or all of the content included in the second message (for example, part or all of the container in the second message) to the first message. Optionally, the second message may include information of at least one beam, and may also include other information, for example, the second message may also include one or more of the following: parameters for random access-free switching, second indication information, at least one reference location information, or, a first threshold or at least one threshold, etc., without limitation.

[0112] Alternatively, the threshold for determining whether a beam is available (e.g., a first threshold or at least one threshold) may also be predefined by a protocol or preconfigured in the UE, and the first message and the second message may not include the threshold for determining whether the beam is available. For example, if the threshold for determining whether a beam is available is the first threshold, the first message and the second message may not include the first threshold; or if the threshold for determining whether a beam is available is at least one threshold, the first message and the second message may not include at least one threshold.

[0113] S502: The second network device sends a PDCCH to the UE using at least one beam (or at least one beam direction). Accordingly, the UE may detect the PDCCH from the second network device using a first beam (or a first beam direction) among the at least one beam.

[0114] Among them, if the number of at least one beam is 1, that is, the network side only configures one beam for the UE, for example, the beam is the first beam, the network device can use the first beam to send PDCCH to the UE, and the UE can use the first beam to detect the PDCCH from the second network device. In this case, the first message may include the first threshold but not other thresholds, and the first threshold at this time may be a signal quality threshold. Optionally, before receiving (or detecting) the PDCCH of the second network device, the UE may measure the SSB received using the beam. If the obtained measurement result is greater than the first threshold (in this case, the measurement result is the measurement result of the signal quality, and the first threshold is the signal quality threshold), the UE may continue to use the first beam to receive the PDCCH from the second network device; or, if the measurement result is less than or equal to the first threshold, indicating that the signal quality on the first beam is poor, the UE may not use the first beam to continue to detect the PDCCH, for example, the UE may fall back to the random access-based handover (RACH-based HO) process and initiate random access to the second network device, for example, the UE sends a random access preamble to the second network device; or, the UE may initiate an RRC reestablishment process to the second network device or other network devices, and it can also be understood that the RRC reestablishment process can be performed in the target cell, or in other cells other than the target cell. For example, the UE may send an RRC reestablishment request message to the second network device or other network devices to initiate the RRC reestablishment process.

[0115] Alternatively, when the number of at least one beam is 1, the UE may not need to perform measurements before receiving (or detecting) the PDCCH of the second network device, but may determine the distance between the reference position corresponding to the beam and the current position of the UE, and determine the size relationship between the distance and the first threshold, in which case the first threshold may be a distance threshold. If the distance is less than the first threshold, the UE may continue to use the first beam to receive the PDCCH from the second network device; or, if the distance is greater than or equal to the first threshold, indicating that the reliability of the first beam is low, and the first beam may no longer cover the UE, the UE may not use the first beam to continue detecting the PDCCH, for example, the UE may fall back to the RACH-based HO process and initiate random access to the second network device; or, the UE may initiate an RRC re-establishment process to the second network device or other network devices.

[0116] Alternatively, if the number of at least one beam is greater than 1, that is, the network side configures multiple beams for the UE, the first beam may be one of the at least one beam. The second network device may use all beams in the at least one beam to send PDCCH to the UE, and the UE may use the first beam to detect the PDCCH from the second network device. In this case, the first message may include a first threshold, and the first threshold is applicable to at least one beam; or, the first message includes at least one threshold, and at least one threshold corresponds to at least one beam, for example, there is a first threshold in at least one threshold corresponding to the first beam in at least one beam. Optionally, before receiving (or detecting) the PDCCH of the second network device, the UE may measure the SSB received using at least one beam, and determine the first beam based on the measurement results, so as to receive the PDCCH from the second network device in the first beam, or the UE may fall back to the RACH-based HO process or initiate RRC re-establishment based on the measurement results. For example, if there is a measurement result corresponding to a beam in the obtained measurement results that is greater than the first threshold, or greater than the threshold corresponding to the beam in at least one threshold (in this case, the measurement result is a measurement result of signal quality, and the first threshold or at least one threshold is a signal quality threshold), the UE can determine the beam corresponding to the measurement result, for example, the first beam, and the UE can receive the PDCCH from the second network device in the first beam. If there are multiple beams whose corresponding measurement results in at least one beam are greater than the first threshold, the UE can select any one of the beams, for example, the first beam. Alternatively, after measuring the SSB received on at least one beam, the UE can determine the best measurement result. If the measurement result is greater than the first threshold or greater than the threshold corresponding to the beam corresponding to the measurement result, the UE can determine the beam corresponding to the measurement result, for example, the first beam, and the UE can receive the PDCCH from the second network device in the first beam. Alternatively, if the measurement results obtained by the UE are all less than or equal to the first threshold, or the best measurement result obtained by the UE is less than or equal to the first threshold, indicating that the signal quality on at least one beam is poor, the UE may not continue to detect the PDCCH in any beam of the at least one beam. For example, the UE may fall back to the RACH-based HO process and initiate random access to the second network device; or, the UE may initiate an RRC re-establishment process to the second network device or other network devices.

[0117] Alternatively, when the number of at least one beam is greater than 1, the UE may not need to perform measurements before receiving (or detecting) the PDCCH of the second network device, but may determine the distance between the reference position corresponding to each beam in the at least one beam and the current position of the UE, and may determine at least one distance in total. A first beam may be determined based on the at least one distance, so that the PDCCH from the second network device is received in the first beam, or the UE may fall back to the RACH-based HO process or initiate RRC re-establishment based on the at least one distance. For example, the UE may determine the size relationship between each distance in the at least one distance and the first threshold. If there is a distance that is less than the first threshold, the UE may receive the PDCCH from the second network device in the beam corresponding to the distance, for example, the beam is the first beam; or, if there are multiple distances that are all less than the first threshold, the UE may randomly select one from the multiple distances and use the beam corresponding to the selected distance to receive the PDCCH from the second network device, for example, the beam is the first beam. Alternatively, if the distances obtained by the UE are all greater than or equal to the first threshold, indicating that the reliability of at least one beam is low, and at least one beam may be unable to cover the UE, the UE may not use any of the at least one beam to continue detecting the PDCCH. For example, the UE may fall back to the RACH-based HO process and initiate random access to the second network device; or, the UE may initiate an RRC re-establishment process to the second network device or other network devices.

[0118] Optionally, the method may further include S503, the UE sends an RRC reconfiguration completion message to the second network device on the second uplink resource, and correspondingly, the second network device receives the RRC reconfiguration completion message from the UE on the second uplink resource. For example, if the first message is an RRC reconfiguration message, and the UE receives a PDCCH from the second network device on the first beam, the UE may execute S503 as a response to the RRC reconfiguration message. The second uplink resource is an uplink resource scheduled by the PDCCH. Optionally, the RRC reconfiguration completion message may include information of the first beam, such as an index of the first beam, so that the second network device can determine which beam of the at least one beam the UE has selected based on the RRC reconfiguration message.

[0119] Optionally, the method further includes S504, the second network device sends a handover completion message to the UE, and accordingly, the UE receives the handover completion message from the second network device. For example, after receiving the RRC reconfiguration completion message in S503, the second network device may also send a handover completion message to the UE to indicate that the cell handover is completed or the handover is successful.

[0120] In an embodiment of the present application, the network side can indicate at least one beam to the UE, and the UE can select a beam from the at least one beam, and the second network device can also send PDCCH to the UE through the beam, thereby improving the UE's success rate of receiving PDCCH, thereby improving the success rate of random access. In addition, the UE can further determine whether at least one beam is available. For example, the UE can determine whether to use at least one beam to detect PDCCH based on the first threshold or at least one threshold, so that when the beam indicated by the network side cannot cover the UE, the UE can no longer use the beam to detect PDCCH, thereby reducing the power consumption of invalid detection of the UE. In addition, the UE can also fall back to RACH-based HO or initiate RRC re-establishment in time, which also reduces the delay of UE accessing the network.

[0121] This application embodiment provides another communication method, see Figure 6 , which is a flow chart of the method.

[0122] S601: A first network device sends a first message to a UE. Correspondingly, the UE receives the first message from the first network device.

[0123] The first message may instruct the UE to switch from the first network device to the target cell, or instruct the UE to switch from the first network device to the target cell under the second network device, or instruct the UE to switch from the source cell under the first network device to the target cell under the second network device. For example, the first message may include an identifier of the target cell, such as the PCI of the target cell, and through the identifier of the target cell, the UE may be instructed to switch from the first network device to the target cell under the second network device. For example, the first message may also be referred to as a handover command. The first message is, for example, an RRC message, and the RRC message is, for example, an RRC reconfiguration message, or may be other RRC messages.

[0124] Optionally, the first message may further include one or more of the following information: a parameter for random access-free switching, a second indication information, at least one reference location information, or a first threshold or at least one threshold. For the parameter for random access-free switching and the second indication information, refer to Figure 4Related introduction to the embodiment shown. The first message may include a first threshold, and the first threshold corresponds to at least one beam, or the first threshold may be applicable to at least one beam. Alternatively, the first message may include at least one threshold, and at least one threshold corresponds to at least one beam, and one threshold may correspond to one or more beams. For example, at least one threshold includes a first threshold, and the first threshold may correspond to a first beam in at least one beam. Alternatively, the first threshold or at least one threshold may not be included in the first message, for example, the second network device may broadcast the first threshold or at least one threshold. For an introduction to thresholds and reference location information, please refer to Figure 5 The embodiment shown. Among them, at least one beam in the embodiment of the present application may include all beams in the target cell, so the first message does not need to indicate the beam.

[0125] Optionally, before S601, when the first network device determines that the UE is to be switched to the second network device, the first network device may send a switching request to the second network device to request that the UE be switched to the second network device, or request that the UE be switched to the target cell under the second network device. After receiving the switching request, the second network device may send a switching request confirmation to the first network device to determine that the UE is switched to the second network device, or determine that the UE is switched to the target cell under the second network device. Among them, the switching request confirmation is, for example, a second message, for example, the first network device can determine the first message according to the second message. One determination method is that the second message and the first message are the same message, that is, the first network device can forward the second message to the UE; another determination method is that the first network device can obtain the first message according to the second message, for example, the first network device adds part or all of the content included in the second message (for example, part or all of the container in the second message) to the first message. Optionally, the second message may include one or more of the following: parameters for random access-free switching, second indication information, reference location information, or, a first threshold or at least one threshold, etc., without limitation.

[0126] Alternatively, the threshold for determining whether a beam is available (e.g., a first threshold or at least one threshold) may also be predefined by a protocol or preconfigured in the UE, and the first message and the second message may not include the threshold for determining whether the beam is available. For example, if the threshold for determining whether a beam is available is the first threshold, the first message and the second message may not include the first threshold; or if the threshold for determining whether a beam is available is at least one threshold, the first message and the second message may not include at least one threshold.

[0127] S602: The second network device sends a PDCCH to the UE using at least one beam (or at least one beam direction). Accordingly, the UE may detect the PDCCH from the second network device using a first beam (or a first beam direction) among the at least one beam.

[0128] At least one beam in the embodiment of the present application may be all beams in the target cell, so the number of at least one beam may be greater than 1, and the first beam may be one of the at least one beam. The second network device may use all beams in the at least one beam to send PDCCH to the UE, and the UE may use the first beam to detect the PDCCH from the second network device. In this case, the first message may include a first threshold, and the first threshold is applicable to at least one beam; or, the first message includes at least one threshold, and at least one threshold corresponds to at least one beam, for example, there is a first threshold in at least one threshold corresponding to the first beam in at least one beam. Optionally, before receiving (or detecting) the PDCCH of the second network device, the UE may measure the SSB received in at least one beam, and the first beam may be determined based on the measurement result, so as to use the first beam to receive the PDCCH from the second network device, or the UE may fall back to the RACH-based HO process or initiate RRC re-establishment based on the measurement result. For this, please refer to Figure 5 Description of the illustrated embodiment.

[0129] Alternatively, before receiving (or detecting) the PDCCH of the second network device, the UE may not need to perform measurements, but may respectively determine the distance between the reference position corresponding to each beam in at least one beam and the current position of the UE, and may determine at least one distance in total, and the first beam may be determined based on the at least one distance, so as to use the first beam to receive the PDCCH from the second network device, or the UE may fall back to the RACH-based HO process or initiate RRC re-establishment based on the at least one distance, for which reference may also be made to Figure 5 Description of the illustrated embodiment.

[0130] Optionally, the method may further include S603, the UE sends an RRC reconfiguration completion message to the second network device on the second uplink resource, and correspondingly, the second network device receives the RRC reconfiguration completion message from the UE on the second uplink resource. For example, if the first message is an RRC reconfiguration message, and the UE receives a PDCCH from the second network device on the first beam, the UE may execute S603 as a response to the RRC reconfiguration message. The second uplink resource is an uplink resource scheduled by the PDCCH. Optionally, the RRC reconfiguration completion message may include information of the first beam, such as an index of the first beam, so that the second network device can determine which beam of the at least one beam the UE has selected based on the RRC reconfiguration message.

[0131] Optionally, the method further includes S604, the second network device sends a handover completion message to the UE, and accordingly, the UE receives the handover completion message from the second network device. For example, after receiving the RRC reconfiguration completion message in S603, the second network device may also send a handover completion message to the UE to indicate that the cell handover is completed or the handover is successful.

[0132] In an embodiment of the present application, the network side may not need to indicate at least one beam to the UE, but may use all beams in the target cell, thereby reducing signaling overhead. The UE may select a beam from at least one beam, and the second network device may also use the beam to send PDCCH to the UE, thereby improving the UE's success rate in receiving PDCCH, thereby improving the success rate of random access-free access. In addition, the UE may further determine whether at least one beam is available. For example, the UE may determine whether to use at least one beam to detect PDCCH based on a first threshold or at least one threshold, so that when the beam in the target cell cannot cover the UE, the UE may no longer use these beams to detect PDCCH, thereby reducing the power consumption of invalid detection of the UE. In addition, the UE may also promptly fall back to RACH-based HO or initiate RRC re-establishment, thereby reducing the delay of UE accessing the network.

[0133] Figure 7 A schematic diagram of the structure of a communication device provided in an embodiment of the present application is given. The communication device 700 may be Figures 4 to 6 The UE or the circuit system of the UE described in any of the embodiments shown in the accompanying drawings is used to implement the method corresponding to the UE in the above method embodiment. Alternatively, the communication device 700 may be Figures 4 to 6 The second network device or the circuit system of the second network device described in any of the embodiments shown in the accompanying drawings is used to implement the method corresponding to the second network device in the above method embodiment. For example, one circuit system is a chip system.

[0134] The communication device 700 includes at least one processor 701. The processor 701 can be used for internal processing of the device to implement certain control processing functions. Optionally, the processor 701 includes instructions. Optionally, the processor 701 can store data. Optionally, different processors can be independent devices, can be located in different physical locations, and can be located on different integrated circuits. Optionally, different processors can be integrated into one or more processors, for example, integrated on one or more integrated circuits.

[0135] Optionally, the communication device 700 includes one or more memories 703 for storing instructions. Optionally, data may also be stored in the memory 703. The processor and memory may be provided separately or integrated together.

[0136] Optionally, the communication device 700 includes a communication line 702 and at least one communication interface 704. Since the memory 703, the communication line 702 and the communication interface 704 are all optional, Figure 7 Indicated by dotted lines.

[0137] Optionally, the communication device 700 may further include a transceiver and / or an antenna. The transceiver may be used to send information to other devices or receive information from other devices. The transceiver may be referred to as a transceiver, a transceiver circuit, an input / output interface, etc., and is used to implement the transceiver function of the communication device 700 through an antenna. Optionally, the transceiver includes a transmitter and a receiver. Exemplarily, the transmitter may be used to generate a radio frequency signal from a baseband signal, and the receiver may be used to convert the radio frequency signal into a baseband signal.

[0138] The processor 701 may include a general-purpose central processing unit (CPU), a microprocessor, an application specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the present application.

[0139] The communication link 702 may include a pathway to transmit information between the above-mentioned components.

[0140] The communication interface 704 uses any transceiver-like device for communicating with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), wired access networks, etc.

[0141] The memory 703 may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory 703 may exist independently and be connected to the processor 701 via the communication line 702. Alternatively, the memory 703 may also be integrated with the processor 701.

[0142] The memory 703 is used to store computer-executable instructions for executing the solution of the present application, and the execution is controlled by the processor 701. The processor 701 is used to execute the computer-executable instructions stored in the memory 703, thereby realizing Figures 4 to 6 The steps performed by the UE or the second network device in the embodiments shown in any one of the accompanying drawings.

[0143] Optionally, the computer-executable instructions in the embodiments of the present application may also be referred to as application code, which is not specifically limited in the embodiments of the present application.

[0144] In a specific implementation, as an embodiment, the processor 701 may include one or more CPUs, such as Figure 7 CPU0 and CPU1 in.

[0145] In a specific implementation, as an embodiment, the communication device 700 may include multiple processors, such as Figure 7 701 and processor 705 in the embodiment of the present invention. Each of these processors may be a single-CPU processor or a multi-CPU processor. The processor herein may refer to one or more devices, circuits, and / or processing cores for processing data (e.g., computer program instructions).

[0146] when Figure 7When the device shown is a chip, for example, a chip of a UE or a chip of a second network device, the chip includes a processor 701 (may also include a processor 705), a communication line 702 and a communication interface 704, and optionally, the chip may include a memory 703. Specifically, the communication interface 704 may be an input interface, a pin or a circuit, etc. The memory 703 may be a register, a cache, etc. The processor 701 and the processor 705 may be a general-purpose CPU, a microprocessor, an ASIC, or one or more integrated circuits for controlling the execution of a program of the communication method of any of the above embodiments.

[0147] The embodiment of the present application can divide the functional modules of the device according to the above method example. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical functional division. There may be other division methods in actual implementation. For example, in the case of dividing each functional module according to each function, Figure 8 A schematic diagram of a device is shown, and the device 800 may be a UE or a second network device involved in the above-mentioned various method embodiments, or a chip in the UE or a chip in the second network device. The device 800 includes a sending unit 801, a processing unit 802 and a receiving unit 803.

[0148] It should be understood that the apparatus 800 can be used to implement the steps performed by the UE or the second network device in the communication method of the embodiment of the present application, and the relevant features can refer to the above Figures 4 to 6 The embodiments shown in any of the accompanying drawings will not be described in detail here.

[0149] Optional, Figure 8 The functions / implementation processes of the sending unit 801, the receiving unit 803 and the processing unit 802 can be Figure 7 The processor 701 in the embodiment calls the computer execution instruction stored in the memory 703 to implement. Or, Figure 8 The function / implementation process of the processing unit 802 in Figure 7 The processor 701 in the embodiment calls the computer execution instruction stored in the memory 703 to implement, Figure 8 The functions / implementation processes of the sending unit 801 and the receiving unit 803 can be Figure 7 The communication interface 704 in is implemented.

[0150] Optionally, when the device 800 is a chip or a circuit, the functions / implementation processes of the sending unit 801 and the receiving unit 803 can also be implemented through pins or circuits.

[0151] The present application also provides a computer-readable storage medium, which stores a computer program or instruction. When the computer program or instruction is executed, the method performed by the UE or the second network device in the aforementioned method embodiment is implemented. In this way, the functions described in the above embodiments can be implemented in the form of software functional units and sold or used as independent products. Based on this understanding, the technical solution of the present application can be essentially or in other words, the part that contributes or the part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. Storage media include: various media that can store program codes, such as USB flash drives, mobile hard drives, ROM, RAM, magnetic disks, or optical disks.

[0152] The present application also provides a computer program product, which includes: a computer program code, when the computer program code is run on a computer, the computer executes the method executed by the UE or the second network device in any of the aforementioned method embodiments.

[0153] An embodiment of the present application further provides a processing device, including a processor and an interface; the processor is used to execute the method executed by the UE or the second network device involved in any of the above method embodiments.

[0154] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. 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 computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrated. The available medium may be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid state disk (SSD)), etc.

[0155] The various illustrative logic units and circuits described in the embodiments of the present application can be implemented or operated by a general-purpose processor, a digital signal processor (DSP), an ASIC, a field-programmable gate array (FPGA), or other programmable logic devices, discrete gates or transistor logic, discrete hardware components, or any combination of the above. The general-purpose processor can be a microprocessor, and optionally, the general-purpose processor can also be any conventional processor, controller, microcontroller or state machine. The processor can also be implemented by a combination of computing devices, such as a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors combined with a digital signal processor core, or any other similar configuration.

[0156] The steps of the method or algorithm described in the embodiments of the present application can be directly embedded in the hardware, the software unit executed by the processor, or the combination of the two. The software unit can be stored in RAM, flash memory, ROM, erasable programmable read-only memory (erasable programmable read-only memory, EPROM), EEPROM, register, hard disk, removable disk, CD-ROM or other storage media of any form in the art. Exemplarily, the storage medium can be connected to the processor so that the processor can read information from the storage medium and can write information to the storage medium. Optionally, the storage medium can also be integrated into the processor. The processor and the storage medium can be arranged in an ASIC, and the ASIC can be arranged in a terminal device. Optionally, the processor and the storage medium can also be arranged in different components in the terminal device.

[0157] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0158] The contents of the various embodiments of the present application may refer to each other. If there is no special explanation and logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced to each other. The technical features in different embodiments can be combined to form new embodiments according to their internal logical relationships.

[0159] It is understandable that in the embodiment of the present application, the UE and / or the second network device may perform some or all of the steps in the embodiment of the present application, and these steps or operations are only examples. In the embodiment of the present application, other operations or variations of various operations may also be performed. In addition, the various steps may be performed in different orders presented in the embodiment of the present application, and it is possible that not all operations in the embodiment of the present application need to be performed.

Claims

1. A communication method, characterized in that: Applied to a terminal device, the method comprises: Receiving a first message from a first network device, where the first message is used to instruct the terminal device to switch from the first network device to a target cell under a second network device, where the first message includes first configuration information, where the first configuration information is used to configure at least one uplink resource, where the at least one uplink resource is used to send a scheduling request SR, where the at least one uplink resource corresponds to at least one synchronization signal and a physical broadcast channel block SSB, where one SSB corresponds to one or more uplink resources, or where the first configuration information includes at least one configuration information for configuring the at least one uplink resource, where the at least one configuration information corresponds to at least one SSB, where one SSB corresponds to one or more configuration information; Sending a first SR to the second network device using a first uplink resource in the at least one uplink resource, where the first uplink resource is an uplink resource corresponding to the first SSB, or an uplink resource configured by configuration information corresponding to the first SSB in the at least one configuration information; Receive a physical downlink control channel PDCCH from the second network device using the beam direction corresponding to the first SSB; Release the first configuration information or the at least one uplink resource.

2. The method according to claim 1, characterized in that The first SSB is the SSB with the best signal quality measured by the terminal device.

3. The method according to claim 1 or 2, characterized in that: Releasing the first configuration information or the at least one uplink resource includes: When the PDCCH is received, the first configuration information or the at least one uplink resource is released; or, sending a radio resource control RRC reconfiguration completion message to the second network device, and releasing the first configuration information or the at least one uplink resource when sending the RRC reconfiguration completion message; or, When the switching completion information is received from the second network device, the first configuration information or the at least one uplink resource is released.

4. The method according to any one of claims 1 to 3, characterized in that: The method further comprises: Sending first indication information to the second network device, where the first indication information is used to indicate that the first configuration information or the at least one uplink resource has been released.

5. The method according to any one of claims 1 to 4, characterized in that: The method further comprises: When the first message is received, determining the first SSB; or, The first message also indicates a switching condition, and when the switching condition is met, the first SSB is determined.

6. The method according to any one of claims 1 to 5, characterized in that: The first message further indicates parameters for the terminal device to perform random access-free switching, and / or the first message further includes second indication information, and the second indication information is used to instruct the terminal device to perform random access-free switching.

7. The method according to any one of claims 1 to 6, characterized in that: The first message is an RRC reconfiguration message.

8. A communication method, characterized in that: Applied to the second network device, the method comprises: Receiving a first SR from a terminal device on a first uplink resource; Determine a first SSB according to the first uplink resource; Use the beam direction corresponding to the first SSB to send PDCCH to the terminal device.

9. The method according to claim 8, characterized in that The method further comprises: A second message is sent to a first network device, where the second message is used to instruct the terminal device to switch from the first network device to the second network device, where the second message includes first configuration information, where the first configuration information is used to configure at least one uplink resource, where the at least one uplink resource is used to send an SR, where the at least one uplink resource includes the first uplink resource, where the at least one uplink resource corresponds to at least one SSB, where one SSB corresponds to one or more uplink resources, or where the first configuration information includes at least one configuration information for configuring the at least one uplink resource, where the at least one configuration information corresponds to at least one SSB, where one SSB corresponds to one or more configuration information.

10. The method according to claim 8 or 9, characterized in that: Determining a first SSB according to the first uplink resource includes: Determining configuration information for configuring the first uplink resource according to the first uplink resource; Determine the first SSB corresponding to the configuration information.

11. The method according to any one of claims 8 to 10, characterized in that: The method further comprises: Receive first indication information from the terminal device, the first indication information is used to indicate that first configuration information or at least one uplink resource has been released, the first configuration information is used to configure the at least one uplink resource, the first configuration information includes configuration information for configuring the first uplink resource, and the at least one uplink resource includes the first uplink resource.

12. The method according to any one of claims 8 to 11, characterized in that: The second message further indicates parameters for the terminal device to perform random access-free switching, and / or the second message further includes second indication information, and the second indication information is used to instruct the terminal device to perform random access-free switching.

13. A communication method, characterized in that: Applied to a terminal device, the method comprises: receiving a first message from a first network device, the first message indicating at least one beam, the first network device being a source network device of the terminal device; When there is a first beam in the at least one beam whose measurement value is greater than or equal to a first threshold corresponding to the first beam, the first beam direction is used to receive a PDCCH from a second network device, where the second network device is a target network device of the terminal device.

14. The method according to claim 13, characterized in that The method further comprises: Sending an RRC reconfiguration completion message to the second network device, where the RRC reconfiguration completion message includes an index of the first beam; The handover completion information is received from the second network device using the first beam direction.

15. The method according to claim 13 or 14, characterized in that The method further comprises: When there is no beam in the at least one beam whose measurement value is greater than the corresponding threshold, random access is initiated to the second network device, or an RRC re-establishment request message is sent to the second network device or other network devices.

16. The method according to any one of claims 13 to 15, characterized in that: The measurement value of the first beam is used to indicate the signal quality corresponding to the first beam, and the first threshold is a signal quality threshold; or, The measurement value of the first beam is the distance between a reference position corresponding to the first beam and the position of the terminal device, and the first threshold is a distance threshold.

17. The method according to any one of claims 13 to 16, characterized in that: The first message includes the first threshold, and the first threshold corresponds to the at least one beam; or, The first message includes at least one threshold, and the at least one threshold corresponds to the at least one beam in a one-to-one manner, wherein the at least one threshold includes the first threshold.

18. A communication method, characterized in that: Applied to the second network device, the method comprises: Sending a PDCCH to a terminal device in at least one beam, where the at least one beam is a beam indicated to the terminal device for cell switching, and the second network device is a target network device of the terminal device; Receiving an RRC reconfiguration complete message from the terminal device using a first beam direction in the at least one beam, the RRC reconfiguration complete message including an index of the first beam; Use the first beam direction to send switching completion information to the terminal device.

19. The method according to claim 18, characterized in that The method further comprises: A second message is sent to a first network device, wherein the second message indicates the at least one beam, and the first network device is a source network device of the terminal device.

20. The method according to claim 18 or 19, characterized in that The second message includes a first threshold, wherein the first threshold corresponds to the at least one beam; or, The second message includes at least one threshold, and the at least one threshold corresponds to the at least one beam in a one-to-one manner.

21. A communication device, characterized in that: The communication device includes a processing unit and a transceiver unit, and the processing unit is coupled to the transceiver unit to execute the method according to any one of claims 1 to 7, or the method according to any one of claims 8 to 12, or the method according to any one of claims 13 to 17, or the method according to any one of claims 18 to 20.

22. A communication device, characterized in that: The communication device includes a processor and a memory, the memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory, so that the communication device performs the method according to any one of claims 1 to 7, or the communication device performs the method according to any one of claims 8 to 12, or the communication device performs the method according to any one of claims 13 to 17, or the communication device performs the method according to any one of claims 18 to 20.

23. A computer-readable storage medium, characterized in that: The computer-readable storage medium is used to store a computer program. When the computer program is run on a computer, the computer executes the method as claimed in any one of claims 1 to 7, or the computer executes the method as claimed in any one of claims 8 to 12, or the computer executes the method as claimed in any one of claims 13 to 17, or the computer executes the method as claimed in any one of claims 18 to 20.

24. A computer program product, characterized in that The computer program product comprises a computer program, which, when executed on a computer, enables the computer to execute the method according to any one of claims 1 to 7, or enables the computer to execute the method according to any one of claims 8 to 12, or enables the computer to execute the method according to any one of claims 13 to 17, or enables the computer to execute the method according to any one of claims 18 to 20.

25. A chip system, characterized in that: The chip system comprises: A processor and an interface, wherein the processor is used to call and run instructions from the interface, and when the processor executes the instructions, the method according to any one of claims 1 to 7 is implemented, or the method according to any one of claims 8 to 12 is implemented, or the method according to any one of claims 13 to 17 is implemented, or the method according to any one of claims 18 to 20 is implemented.

26. A communication system, characterized in that: The communication system comprises a terminal device and a second network device, wherein: The terminal device is used to execute the method according to any one of claims 1 to 7, and the second network device is used to execute the method according to any one of claims 8 to 12; or, The terminal device is used to execute the method according to any one of claims 13 to 17, and the second network device is used to execute the method according to any one of claims 18 to 20.

Images