Communication method and communication apparatus

Abstract

The application provides a communication method and a communication device. A flow of DAPS switching of a UE in a SUL scenario, i.e. a band combination of SUL, is given. The method can fully utilize a terminal device receiving, transmitting channel and baseband processing resource, reduce interruption time introduced by switching, improve data throughput and cell edge coverage.

Description

[0001] This application is a divisional application. The original application has the application number 202080015425.3 and the original application date is October 23, 2020. The entire contents of the original application are incorporated herein by reference. Technical Field

[0002] This application relates to the field of communications, and more specifically, to a communication method and a communication device. Background Technology

[0003] Dual Active Protocol Stack (DAPS) handover (also known as 0ms handover) is essentially a soft handover: when handover occurs, the user equipment (UE) only disconnects its air interface signal with the source cell, including signaling and data, after successfully completing random access to the target cell; during the handover process, the UE simultaneously receives and transmits signals from both the source and target cells, ensuring uninterrupted service. Ordinary hard handover involves the UE immediately disconnecting its signal from the source cell upon handover. Compared to hard handover, DAPS handover reduces the interruption time introduced by handover, making the interruption time close to or equal to 0ms, and improves handover reliability, providing the UE with a seamless handover communication experience.

[0004] Since existing technologies only provide methods for implementing DAPS handover in single-carrier scenarios, how to implement DAPS handover in multi-carrier scenarios has become an important issue that urgently needs attention. Summary of the Invention

[0005] This application provides a communication method and a communication device that can realize DAPS switching in SUL scenarios.

[0006] In a first aspect, a communication method is provided, comprising: receiving first information from a source cell, the first information indicating a carrier of the source cell, the carrier of the source cell including at least one of a first auxiliary uplink SUL carrier and a first uplink carrier, wherein the first SUL carrier and the first uplink carrier share a cell identifier of the source cell; receiving a dual-activation protocol stack (DAPS) handover message from the source cell, the DAPS handover message including target cell information, the target cell information indicating a carrier of the target cell, the carrier of the target cell including at least one of a second SUL carrier and a second uplink carrier, wherein the second SUL carrier and the second uplink carrier share a cell identifier of the target cell; transmitting an uplink signal on a carrier of the source cell, and initiating a random access procedure on a carrier of the target cell.

[0007] In the above technical solution, when there are multiple uplink carriers between the source cell or target cell and the terminal device, one of the carriers is selected to communicate with the source cell and the target cell respectively. This method can utilize the terminal device's receiving and transmitting channels and baseband processing resources to reduce the interruption time introduced by handover.

[0008] In conjunction with the first aspect, in certain implementations of the first aspect, the carrier of the source cell includes a first SUL carrier and a first uplink carrier. Transmitting an uplink signal on one carrier of the source cell includes:

[0009] Uplink signals are transmitted only on carriers configured with a Physical Uplink Control Channel (PUCCH), wherein the carrier configured with PUCCH is either the first SUL carrier or the first uplink carrier.

[0010] In conjunction with the first aspect, in some implementations of the first aspect, the carrier of the source cell includes a first SUL carrier and a first uplink carrier, and transmitting an uplink signal on one carrier of the source cell includes: transmitting an uplink signal only on the first SUL carrier.

[0011] In the above technical solution, the terminal device uses a SUL carrier to communicate with the source cell, which can improve data throughput and cell edge coverage.

[0012] In conjunction with the first aspect, in some implementations of the first aspect, a first downlink control information (DCI) from the source cell is received, and the first DCI is parsed based on the expectations of the first SUL carrier and the first uplink carrier.

[0013] In conjunction with the first aspect, in some implementations of the first aspect, the carrier of the target cell includes a second SUL carrier and a second uplink carrier. After accessing the target cell, the method further includes: transmitting uplink signals only on carriers configured with a physical uplink control channel (PUCCH), wherein the carrier configured with PUCCH is either a second SUL carrier or a second uplink carrier.

[0014] In conjunction with the first aspect, in some implementations of the first aspect, the carrier of the target cell includes a second SUL carrier and a second uplink carrier. After accessing the target cell, the method further includes: transmitting uplink signals only on the second SUL carrier.

[0015] In the above technical solution, the terminal device uses a SUL carrier to communicate with the target cell, which can improve data throughput and cell edge coverage.

[0016] In conjunction with the first aspect, in some implementations of the first aspect, the second downlink control information (DCI) from the target cell is received, and the second DCI is parsed based on the expectations of the second SUL carrier and the second uplink carrier.

[0017] In conjunction with the first aspect, in some implementations of the first aspect, the carrier of the source cell includes a first SUL carrier and a first uplink carrier; before receiving the DAPS handover message, the method further includes: receiving configuration information from the source cell, the configuration information being used to release one of the first SUL carrier and the first uplink carrier.

[0018] In conjunction with the first aspect, in some implementations of the first aspect, after accessing the target cell, the method further includes: receiving second information from the target cell, the second information being used to indicate a third carrier of the target cell; and transmitting an uplink signal on one of the carriers indicated by the target cell information and the second information.

[0019] In conjunction with the first aspect, in some implementations of the first aspect, before receiving the first information, the method further includes: sending a first capability message to the source cell, the first capability message including indication information for indicating that the SUL scenario supports DAPS handover.

[0020] In a second aspect, a communication method is provided, comprising: sending a first capability message to a source cell, the first capability message including indication information for indicating that the assisted uplink SUL scenario supports DAPS handover; receiving first information from the source cell, the first information indicating a carrier of the source cell, the carrier of the source cell including at least one of a first assisted uplink SUL carrier and a first uplink carrier, wherein the first SUL carrier and the first uplink carrier share a cell identifier of the source cell; and receiving a dual-activation protocol stack DAPS handover message from the source cell, the DAPS handover message including target cell information, the target cell information indicating a carrier of the target cell, the carrier of the target cell including at least one of a second SUL carrier and a second uplink carrier, wherein the second SUL carrier and the second uplink carrier share a cell identifier of the target cell.

[0021] In the above technical solution, the terminal device can reduce the interruption time introduced by handover by reporting to the source base station whether the UE supports DAPS handover in the SUL scenario, thereby utilizing the terminal device's receiving and transmitting channels and baseband processing resources.

[0022] In conjunction with the second aspect, in some implementations of the second aspect, the carrier of the source cell includes a first SUL carrier and a first uplink carrier; before receiving the DAPS handover message, the method further includes: receiving configuration information from the source cell, the configuration information being used to release one of the first SUL carrier and the first uplink carrier.

[0023] In conjunction with the second aspect, in some implementations of the second aspect, the carrier of the source cell includes a first SUL carrier and a first uplink carrier; the method further includes: transmitting an uplink signal on a carrier of the source cell and initiating a random access procedure on a carrier of the target cell.

[0024] In conjunction with the second aspect, in some implementations of the second aspect, the source cell's carrier includes a first SUL carrier and a first uplink carrier. Transmitting an uplink signal on one carrier of the source cell includes:

[0025] Uplink signals are transmitted only on carriers configured with a Physical Uplink Control Channel (PUCCH), wherein the carrier configured with PUCCH is either the first SUL carrier or the first uplink carrier.

[0026] In conjunction with the second aspect, in some implementations of the second aspect, the carrier of the source cell includes a first SUL carrier and a first uplink carrier. Transmitting an uplink signal on one carrier of the source cell includes: transmitting an uplink signal only on the first SUL carrier.

[0027] In the above technical solution, the terminal device uses a SUL carrier to communicate with the source cell, which can improve data throughput and cell edge coverage.

[0028] In conjunction with the second aspect, in some implementations of the second aspect, the first downlink control information (DCI) from the source cell is received, and the first DCI is parsed based on the expectations of the first SUL carrier and the first uplink carrier.

[0029] In conjunction with the second aspect, in some implementations of the second aspect, the carrier of the target cell includes a second SUL carrier and a second uplink carrier. After accessing the target cell, the method further includes: transmitting uplink signals only on carriers configured with a physical uplink control channel (PUCCH), wherein the carrier configured with PUCCH is either a second SUL carrier or a second uplink carrier.

[0030] In conjunction with the second aspect, in some implementations of the second aspect, the carrier of the target cell includes a second SUL carrier and a second uplink carrier. After accessing the target cell, the method further includes: transmitting uplink signals only on the second SUL carrier.

[0031] In the above technical solution, the terminal device uses a SUL carrier to communicate with the target cell, which can improve data throughput and cell edge coverage.

[0032] In conjunction with the second aspect, in some implementations of the second aspect, the second downlink control information (DCI) from the target cell is received, and the second DCI is parsed based on the expectations of the second SUL carrier and the second uplink carrier.

[0033] In conjunction with the second aspect, in some implementations of the second aspect, after accessing the target cell, the method further includes: receiving second information from the target cell, the second information being used to indicate the third carrier of the target cell; and transmitting an uplink signal on one of the carriers indicated by the target cell information and the second information.

[0034] Thirdly, a communication method is provided, comprising: receiving first information from a source cell, the first information indicating a carrier of the source cell, the carrier of the source cell including at least one of a first auxiliary uplink SUL carrier and a first uplink carrier, wherein the first SUL carrier and the first uplink carrier share a cell identifier of the source cell; receiving a dual-activation protocol stack (DAPS) handover message from the source cell, the DAPS handover message including target cell information, the target cell information indicating a carrier of the target cell, the carrier of the target cell including at least one of a second SUL carrier and a second uplink carrier, wherein the second SUL carrier and the second uplink carrier share a cell identifier of the target cell; and when at least one carrier of the source cell and at least one carrier of the target cell belong to the same frequency point or the same frequency band, transmitting an uplink signal on one or two carriers of the source cell, and initiating a random access procedure on one carrier of the target cell.

[0035] In the above technical solution, the terminal device can reduce carrier release by judging whether multiple carrier frequency points are the same or similar, thereby improving data throughput and cell edge coverage.

[0036] In conjunction with the third aspect, in certain implementations of the third aspect, when at least one carrier of the source cell and at least one carrier of the target cell belong to the same frequency point or the same frequency band, transmitting uplink signals on one or two carriers of the source cell includes: when the first information includes a first SUL carrier and a first NUL carrier, the target cell information includes a second SUL carrier, and the second SUL carrier has the same frequency point or belongs to the same frequency band as the first SUL carrier, the communication device transmits uplink signals on the first SUL carrier and the first NUL carrier.

[0037] In conjunction with the third aspect, in certain implementations of the third aspect, when at least one carrier of the source cell and at least one carrier of the target cell belong to the same frequency point or the same frequency band, transmitting uplink signals on one or two carriers of the source cell includes: when the first information indicates a first SUL carrier and a first NUL carrier, the target cell information includes a second NUL carrier, and the second NUL carrier has the same frequency point or belongs to the same frequency band as the first NUL carrier, the communication device transmits uplink signals on the first SUL carrier and the first NUL carrier.

[0038] In conjunction with the third aspect, in some implementations of the third aspect, after accessing the target cell, the method further includes: receiving second information from the target cell, the second information being used to indicate a third carrier of the target cell; and transmitting an uplink signal on one or two carriers of the target cell when at least one carrier of the source cell and at least one carrier of the target cell belong to the same frequency point or the same frequency band.

[0039] In conjunction with the third aspect, in certain implementations of the third aspect, when at least one carrier of the source cell and at least one carrier of the target cell belong to the same frequency point or the same frequency band, transmitting uplink signals on one or two carriers of the target cell includes: when the carriers of the target cell configured in the target cell and the second information include a second SUL carrier and a second NUL carrier, the first information includes a first SUL carrier, and the second SUL carrier has the same frequency point or belongs to the same frequency band as the first SUL carrier, the communication device transmits uplink signals on the second SUL carrier, the second NUL carrier and the first SUL carrier.

[0040] In conjunction with the third aspect, in some implementations of the third aspect, when at least one carrier of the source cell and at least one carrier of the target cell belong to the same frequency point or the same frequency band, transmitting uplink signals on one or two carriers of the target cell includes: when the target cell carrier configured in the target cell and the second information includes a second SUL carrier and a second NUL carrier, the first information includes a first NUL carrier, and the second NUL carrier has the same frequency point or belongs to the same frequency band as the first NUL carrier, the communication device transmits uplink signals on the second SUL carrier, the second NUL carrier and the first NUL carrier.

[0041] In conjunction with the third aspect, in some implementations of the third aspect, the second downlink control information (DCI) from the target cell is received, and the second DCI is parsed based on the expectations of the second SUL carrier and the second uplink carrier.

[0042] In conjunction with the third aspect, in some implementations of the third aspect, before receiving the first information, the method further includes: sending a first capability message to the source cell, wherein the first capability message includes indication information for indicating that the SUL scenario supports DAPS handover.

[0043] Fourthly, a communication method is provided, comprising: receiving first information from a source cell, the first information indicating one or more carriers of the source cell; receiving a dual-activation protocol stack (DAPS) handover message from the source cell, the DAPS handover message including target cell information, the target cell information indicating one or more carriers of the target cell; when one carrier of the source cell and one carrier of the target cell belong to the same frequency point or the same frequency band, transmitting an uplink signal on one or two carriers of the source cell, and initiating a random access procedure on one carrier of the target cell.

[0044] In the above technical solution, the terminal device can reduce carrier release by judging whether multiple carrier frequency points are the same or similar, thereby improving data throughput and cell edge coverage.

[0045] In conjunction with the fourth aspect, in some implementations of the fourth aspect, the carrier of the target cell includes multiple carriers. After accessing the target cell, the method further includes: transmitting uplink signals on one or two carriers of the target cell when at least one carrier of the source cell and at least one carrier of the target cell belong to the same frequency point or the same frequency band.

[0046] Fifthly, a communication method is provided, comprising: receiving first information from a source cell, the first information indicating a carrier of the source cell, the carrier of the source cell including at least one of a first auxiliary uplink SUL carrier and a first uplink carrier, wherein the first SUL carrier and the first uplink carrier share a cell identifier of the source cell; receiving a dual-activation protocol stack (DAPS) handover message from the source cell, the DAPS handover message including target cell information, the target cell information indicating a carrier of the target cell, the carrier of the target cell including at least one of a second SUL carrier and a second uplink carrier, wherein the second SUL carrier and the second uplink carrier share a cell identifier of the target cell; and transmitting uplink signals between the carriers of the source cell and the carriers of the target cell in a time-division multiplexing manner based on a first time interval.

[0047] In the above technical solution, in the SUL scenario, by implementing TDM handover with GAP, DAPS handover function can also be implemented on low-end UEs that only support one carrier.

[0048] In conjunction with the fifth aspect, in some implementations of the fifth aspect, before receiving the DAPS handover message, the method further includes: sending second capability information to the source cell, the second capability information being used to indicate the first time interval.

[0049] In conjunction with the fifth aspect, in some implementations of the fifth aspect, before receiving the first information, the method further includes: sending a first capability message to the source cell, the first capability message including indication information for indicating that the SUL scenario supports DAPS handover.

[0050] A sixth aspect provides a communication method, comprising: receiving first information from a source cell, the first information indicating one or more carriers of the source cell; receiving a dual-activation protocol stack (DAPS) handover message from the source cell, the DAPS handover message including target cell information, the target cell information indicating one or more carriers of the target cell; and transmitting uplink signals between the carriers of the source cell and the carriers of the target cell in a time-division multiplexing manner based on a first time interval.

[0051] In the above technical solution, in a multi-carrier scenario, by implementing TDM handover with gaps, DAPS handover function can also be implemented on low-end UEs that only support one carrier.

[0052] In conjunction with the sixth aspect, in some implementations of the sixth aspect, before receiving the DAPS handover message, the method further includes: sending second capability information to the source cell, the second capability information being used to indicate the first time interval.

[0053] In a seventh aspect, this application provides a communication device having the function of implementing the methods of the first to sixth aspects and any possible implementations of the first to sixth aspects. The function can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above-described functions.

[0054] Eighthly, this application provides a communication device including at least one processor coupled to at least one memory, the at least one memory for storing computer programs or instructions, and the at least one processor for calling and running the computer program or instructions from the at least one memory, such that the communication device performs the methods of the first to sixth aspects and any possible implementation thereof.

[0055] In one example, the communication device could be a terminal device.

[0056] A ninth aspect provides a processor, comprising: an input circuit, an output circuit, and a processing circuit. The processing circuit is configured to receive signals through the input circuit and transmit signals through the output circuit, such that any one of the first to sixth aspects, and any possible implementation thereof, is implemented.

[0057] In specific implementation, the processor can be a chip, the input circuit can be an input pin, the output circuit can be an output pin, and the processing circuit can be a transistor, gate circuit, flip-flop, and various logic circuits. The input signal received by the input circuit can be received and input by, for example, but not limited to, a receiver, and the signal output by the output circuit can be output to, for example, but not limited to, a transmitter and transmitted by the transmitter. Furthermore, the input circuit and the output circuit can be the same circuit, which is used as the input circuit and the output circuit at different times. This application does not limit the specific implementation of the processor and various circuits.

[0058] In a tenth aspect, this application provides a computer-readable storage medium storing computer instructions that, when executed on a computer, cause the methods described in the first to sixth aspects and any possible implementation thereof to be performed.

[0059] In one aspect, this application provides a computer program product comprising computer program code that, when executed on a computer, causes a method as described in the first to sixth aspects and any possible implementation thereof to be performed.

[0060] In a twelfth aspect, this application provides a chip including a processor and a communication interface, the communication interface being used to receive signals and transmit the signals to the processor, the processor processing the signals to cause a method as described in the first to sixth aspects and any possible implementation thereof to be executed.

[0061] In a thirteenth aspect, this application provides a communication system including the communication device as described in the eighth aspect. Attached Figure Description

[0062] Figure 1 This is a schematic diagram illustrating an application scenario of an embodiment of this application;

[0063] Figure 2 This is a schematic flowchart of a communication method proposed in this application;

[0064] Figure 3 This is a schematic flowchart of another communication method proposed in this application;

[0065] Figure 4 A schematic block diagram of the communication device 1000 provided in this application;

[0066] Figure 5 A schematic structural diagram of the communication device 10 provided in this application. Detailed Implementation

[0067] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0068] The technical solutions of this application embodiment can be applied to various communication systems, such as: Global System for Mobile Communications (GSM) system, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD) system, Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system, future 5th generation (5G) systems or new radio (NR) systems, and vehicle-to-other devices (V2X). V2X can include vehicle-to-network (V2N), vehicle-to-vehicle (V2V), and vehicle-to-infrastructure (V2X). Vehicle-to-infrastructure (V2I), vehicle-to-pedestrian (V2P), long-term evolution of vehicle-to-vehicle (LTE-V), vehicle-to-everything (V2X), machine-type communication (MTC), Internet of Things (IoT), long-term evolution of machine-to-machine (LTE-M), machine-to-machine (M2M), etc.

[0069] Figure 1 A schematic diagram of a network architecture provided by an embodiment of this application is shown. For example... Figure 1As shown, the communication system of this application embodiment may include a network device and multiple terminal devices. The network device may include one or more antennas. In addition, the network device may additionally include a transmitter chain and a receiver chain, which, as will be understood by those skilled in the art, may each include multiple components (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, or antennas, etc.) related to signal transmission and reception.

[0070] Network devices can communicate with multiple terminal devices. The terminal devices in this application embodiment can also be referred to as: user equipment (UE), mobile station (MS), mobile terminal (MT), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment, user agent, or user device, etc.

[0071] Terminal devices can be devices that provide voice / data connectivity to users, such as handheld devices with wireless connectivity, in-vehicle devices, etc. Currently, examples of terminal devices include: mobile phones, tablets, laptops, PDAs, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in 5G networks, or future public land mobile communication networks. The embodiments of this application do not limit the terminal devices in a network (PLMN) and / or any other suitable devices for communicating on a wireless communication system.

[0072] Wearable devices, also known as wearable smart devices, are a general term for devices that utilize wearable technology to intelligently design and develop everyday wearables, such as glasses, gloves, watches, clothing, and shoes. Wearable devices are portable devices worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are not merely hardware devices; they achieve powerful functions through software support, data interaction, and cloud interaction. Broadly defined, wearable smart devices include those with comprehensive functions, large sizes, and the ability to perform complete or partial functions without relying on a smartphone, such as smartwatches or smart glasses. They also include devices focused on a specific application function that require the use of other devices, such as smart bracelets and smart jewelry for vital sign monitoring.

[0073] Furthermore, in this embodiment, the terminal device can also be a terminal device in an Internet of Things (IoT) system. IoT is an important component of the future development of information technology. Its main technical feature is to connect objects to the network through communication technology, thereby realizing an intelligent network of human-machine interconnection and object-to-object interconnection.

[0074] In addition, in this embodiment, the terminal device may also include sensors such as smart printers, train detectors, and gas stations. Its main functions include collecting data (for some terminal devices), receiving control information and downlink data from network devices, and sending electromagnetic waves to transmit uplink data to network devices.

[0075] The network device in this application embodiment can be a device for communicating with terminal devices. This network device can be a base transceiver station (BTS) in a Global System for Mobile Communications (GSM) system or Code Division Multiple Access (CDMA), a base station B (nodeB, NB) in a Wideband Code Division Multiple Access (WCDMA) system, an evolved node B (eNB, eNodeB) in an LTE system, a radio controller in a cloud radio access network (CRAN) scenario, a radio network controller (RNC), a base station controller (BSC), a home base station (e.g., home evolved nodeB, or home nodeB, HNB), a baseband unit (BBU), or a relay station, access point, vehicle-mounted device, wearable device, or a network device in a future 5G network or a future evolved PLMN network, etc., and can be an access point in a WLAN. Points (APs), wireless relay nodes, wireless backhaul nodes, transmission points (TPs), or transmission and reception points (TRPs), etc., can be gNBs or transmission points (TRPs or TPs) in new radio (NR) systems, or one or a group of antenna panels (including multiple antenna panels) of a base station in a 5G system, or network nodes constituting gNBs or transmission points, such as baseband units (BBUs) or distributed units (DUs), etc. The embodiments of this application are not limited.

[0076] In some deployments, a gNB may include a centralized unit (CU) and a distribution unit (DU). A gNB may also include an active antenna unit (AAU). The CU implements some of the gNB's functions, and the DU implements others. For example, the CU handles non-real-time protocols and services, implementing radio resource control (RRC) and packet data convergence protocol (PDCP) layer functions. The DU handles physical layer protocols and real-time services, implementing radio link control (RLC), media access control (MAC), and physical (PHY) layer functions. The AAU implements some physical layer processing functions, radio frequency processing, and active antenna-related functions. Since RRC layer information ultimately becomes PHY layer information, or is derived from PHY layer information, in this architecture, higher-layer signaling, such as RRC layer signaling, can be considered to be sent by the DU, or by the DU+AAU. It is understood that network devices can be devices that include one or more of the following: CU nodes, DU nodes, and AAU nodes. In addition, the CU can be classified as a network device in the radio access network (RAN) or as a network device in the core network (CN), and this application does not limit this.

[0077] In addition, in this embodiment of the application, the network device provides services to the cell, and the terminal device communicates with the cell through the transmission resources (e.g., frequency domain resources, or spectrum resources) allocated by the network device. The cell may belong to a macro base station (e.g., macro eNB or macro gNB, etc.) or to a base station corresponding to a small cell. The small cell here may include: metro cell, micro cell, pico cell, femto cell, etc. These small cells have the characteristics of small coverage area and low transmission power, and are suitable for providing high-speed data transmission services.

[0078] Furthermore, in this embodiment of the application, the network device may include a base station (gNB), such as a macro base station, a micro base station, an indoor hotspot, and a relay node, etc. Its function is to send radio waves to the terminal device to realize downlink data transmission on the one hand, and send scheduling information to control uplink transmission on the other hand, and receive the radio waves sent by the terminal device to receive uplink data transmission.

[0079] The following is a brief introduction to the terminology used in this application.

[0080] 1. DAPS handover (also known as 0ms handover) is essentially a soft handover: When handover occurs, the UE only disconnects the air interface signal with the source cell, including signaling and data, after successfully completing random access to the target cell; during the handover process, the UE simultaneously receives and transmits signals from both the source and target cells, ensuring uninterrupted service. Ordinary hard handover involves the UE immediately disconnecting the signal from the source cell upon handover. Compared to hard handover, DAPS handover reduces the interruption time introduced by handover, making the interruption time close to or equal to 0ms, and improves handover reliability, providing the UE with a seamless handover communication experience.

[0081] 2. SUL: As an auxiliary spectrum, SUL can improve uplink signal coverage for the UE at cell boundaries and throughput at the cell center. Specifically, at the cell center, SUL and NR UL schedule uplink transmission by the UE via TDM. For example, SUL and NR UL support TDM handover such as SUL 1T / NUL 1T 0us, SUL 1T / NUL 2T 35.7us~140us, or SUL 2T / NUL 2T 35.7us~140us, etc. Compared to scenarios with only one NR UL uplink carrier, this method provides an additional uplink carrier spectrum because NR UL is TDD-compliant, SUL supports uplink transmission in all time slots, and SUL can transmit signals in the time slots where NR UL is used for downlink, thus increasing uplink throughput. At the cell edge, the terminal device utilizes SUL to improve uplink coverage. Based on simulation and empirical data, the uplink coverage of SUL carriers at low frequency is better than that of NR UL. Therefore, using SUL carriers instead of NR UL carriers to transmit uplink signals at the cell edge can enhance uplink signal coverage.

[0082] Regarding DAPS handover, the 3GPP standard currently has the following provisions. However, the following provisions do not address the frequency band combinations of SUL.

[0083] (1) If dual connectivity (DC) exists, then before the DAPS handover, there is an air interface signaling notification to the UE to release the SCG.

[0084] (2) Handover commands may include DAPS handover instructions, cell-specific configurations, and UE-specific configurations. Cell-specific configurations include cell ID, frequency point, bandwidth, common configurations for the physical random-access channel (PRACH), physical uplink control channel (PUCCH), and physical uplink share channel (PUSCH).

[0085] UE-level configuration includes sounding reference signal (SRS), PUSCH dedicated configuration, and PUCCH dedicated configuration.

[0086] (3) When the UE receives the DAPS handover command, if the original cell has a CA, the UE will release the SCELL itself.

[0087] (4) During the DAPS handover process, there are only two cells: the original cell and the target cell, for uplink transmission and downlink reception.

[0088] (5) When the UE receives the DAPS handover command, it performs cell search, synchronization and RA in the target cell. After the RA is successful, the configuration parameters of the target cell can be modified through RRC reconfiguration signaling.

[0089] (6) After the target cell RA is successful, the UE receives an air interface signaling notification from the target cell to release the source cell, and the UE performs the process of releasing the source cell.

[0090] (7) Regarding UE capabilities: If DAPS handover is supported, the UE can report to the base station through the frequency band combination capability of CA; whether the reporting of the original cell and the target cell is single uplink transmission or multiple uplink transmission. UE capabilities include band combination, feature set combination, and feature set combination DAPS. Among them, band combination refers to the frequency band combination of NR CA, NR non-CA, and / or MR-DC; feature set combination refers to the feature set combination supported by the UE; feature set combination DAPS refers to the feature set combination that supports DAPS. If DAPS handover is supported under the frequency band combination of CA or DC, the UE can report to the base station through band combination and feature set combination DAPS.

[0091] In 3GPP R15 and R16, the SUL band combinations under standalone (SA) and non-standalone (NSA) networking are defined, including the following configuration parameters, UE capabilities, and processing:

[0092] (1) SUL and NR UL indicate whether concurrency is supported through UE capability indication, that is, whether SRS supports concurrency with PUCCH, PUSCH, and SRS of another carrier; otherwise, time division handover is the default.

[0093] (2) SUL 1T and NR UL 1T TDM switching under SA, switching time 0us. 0us is specified by the standard.

[0094] (3) Under NSA, if the channel bandwidth and frequency of the LTE carrier and the SUL carrier are the same, then the SUL 1T and NR UL1T TDM switch will have a switching time of 0us; otherwise, the SUL 1T and NR UL 1T TDM switch will have a switching time of 140us. Both 0us and 140us are specified by the standard.

[0095] (4) UL TDM handover under SA SUL band combination supports up to 2 uplinks transmitting simultaneously. The scenarios are as follows: where carrier 1 is SUL and carrier 2 is NR UL.

[0096] Scenario 1: 1Tx on carrier 1 and 1Tx on carrier 2 (i.e., 1T+1T);

[0097] Scenario 2: 0Tx on carrier 1 and 2Tx on carrier 2 (i.e., 0T+2T).

[0098] (5) SUL cell-level configuration can only exist if NUL cell-level configuration exists.

[0099] (6) RA can be performed in SUL or NUL and the entire RA process must be completed on a selected single carrier.

[0100] ① The base station can specify any carrier to perform random access, and can reconfigure it through PDCCH order or RRC.

[0101] ② If the base station is not specified, and the cell-level configuration includes two carriers, the UE selects which carrier to perform RA based on signal quality. Common configurations include thresholds rsrp-ThresholdSSB-SUL. The UE will only select the SUL carrier for access if the reference signal received power (RSRP) measured by the UE on the downlink carrier is less than the threshold.

[0102] Regarding UL TDM handover under the SA SUL band combination, a maximum of 2T is supported, as detailed below:

[0103] (1) The TDM switching GAP length is {35us, 140us, 210us}.

[0104] (2) TDM handover reports to the base station through UE capabilities. The capability candidate values ​​are {option1, option2, both option1 and option2}.

[0105] Option 1 means that if the base station is configured with UL TDM, then the base station cannot schedule carrier2 in Case 1. That is, carrier1 and carrier2 can only use TDM and cannot run concurrently. See Table 1.

[0106] Table 1

[0107]

[0108]

[0109] Option 2 means that if the base station is configured with UL TDM, the base station can be scheduled on carrier 1 or carrier 2 alone; or it can be scheduled on both carrier 1 and carrier 2 at the same time, that is, it supports the concurrency of carrier 1 and carrier 2, see Table 2.

[0110] Table 2

[0111]

[0112] (3) In UL TDM, RRC specifies which carrier the switching GAP is located on. In SA SUL scenarios, the GAP can be located on either the NR UL carrier or the SUL carrier, specified by uplinkTxSwitchingCarrier.

[0113] (4) The base station specifies the carrier that can be dynamically switched through the uplinkTxSwitchingCarrier of RRC. This carrier can transmit up to 2T. Dynamic switching is only allowed once per slot.

[0114] (5) During UL TDM, downlink interruption is allowed for carrier 1 or carrier 2 in certain frequency band combinations, except for certain frequency band combinations. The reason is that, based on different UE radio frequency structures, such as the coupling between UL and downlink (DL), UL TDM handover will also introduce downlink reception interruption.

[0115] (6) When using UL TDM, no additional TDM pattern is introduced for the SA SUL band combination.

[0116] (7) In UL TDM, the transmission of PRACH preamble, UE CSI computation time, SRS, and PUSCH preparation procedure time will all introduce the relaxation of processing time due to the handover gap.

[0117] Since existing standards do not specify DAPS handover procedures for UEs in SUL scenarios, this application provides a handover method for SUL band combinations, which can reduce handover time interruptions in this scenario and improve the handover success rate.

[0118] See Figure 2 , Figure 2 This is a schematic flowchart of a communication method proposed in this application.

[0119] S201, The terminal device (i.e., an example of a communication device) receives the first information from the source cell.

[0120] The first information is used to indicate the carrier of the source cell, which includes at least one of a first auxiliary uplink SUL carrier and a first uplink carrier, wherein the first SUL carrier and the first uplink carrier share the cell identifier of the source cell. As an example, this embodiment uses a first NR UL carrier (hereinafter referred to as the first NUL carrier) as the first uplink carrier for illustration.

[0121] It should be understood that the first SUL carrier and the first NUL carrier are uplink carriers configured by the source cell for the terminal equipment to communicate with the source cell.

[0122] Optionally, the first information also includes source cell information (i.e., the resources of the source cell). Source cell information will be described in S203, and will not be repeated here.

[0123] S202, the terminal device transmits an uplink signal on a carrier indicated by the first information.

[0124] Specifically, when the first message in S201 indicates only one uplink carrier, the terminal device transmits an uplink signal on that carrier. When the first message indicates two uplink carriers, the first SUL carrier and the first NUL carrier, the terminal device needs to select one of the two uplink carriers to transmit an uplink signal. This can also be understood as the terminal device selecting one of the two uplink carriers to maintain wireless communication with the source cell.

[0125] Specifically, the source cell's cell information includes cell-specific configuration and UE-specific configuration. Cell-specific configuration parameters include cell ID, frequency, bandwidth, PRACH channel, PUCCH channel common configuration, and PUSCH channel common configuration. UE-specific configuration parameters include RS, PUSCH dedicated configuration, and PUCCH dedicated configuration; SRS is a type of RS.

[0126] Optionally, if two uplink carriers are configured, the terminal device transmits uplink signals on the carriers configured with PUCCH in the first SUL carrier and the first NUL carrier. The carrier configured with PUCCH can be a carrier configured with a dedicated PUCCH channel.

[0127] Optionally, the terminal device may choose to fall back to the first SUL carrier to transmit uplink signals.

[0128] Optionally, if two uplink carriers are configured, the terminal device can also receive configuration information from the source cell, which is used to release one of the first SUL carrier and the first NUL carrier. Optionally, this configuration information can be sent before S203.

[0129] It should be noted that when a terminal receives the first downlink control information (DCI) from the source cell, the terminal device needs to parse the first DCI based on the expected first SUL carrier and first uplink carrier. Specifically, if the source cell is configured with two carriers, the NUL / SUL indicator field in the first DCI is x bits; if the source cell is configured with one carrier, the NUL / SUL indicator field in the first DCI is y bits. For example, if the source cell is configured with two carriers, even if the UE subsequently transmits uplink signals in the source cell using only one carrier, the terminal device still needs to parse the NUL / SUL indicator field in the DCI based on x bits. Simply put, it needs to parse the bits corresponding to the received first DCI according to the actual number of carriers configured in the source cell.

[0130] Optionally, when the carrier on which the uplink signal is located includes a sounding reference signal (SRS), the terminal device sends an SRS to the source cell; otherwise, when the carrier on which the first uplink signal is located does not include an SRS, the terminal device does not send an SRS.

[0131] S203, the terminal device receives a DAPS handover message from the source cell.

[0132] The DAPS handover message includes target cell information, which indicates the carrier of the target cell. The carrier of the target cell includes at least one of a second SUL carrier and a second uplink carrier, wherein the second SUL carrier and the second uplink carrier share the cell identifier of the target cell. As an example, this embodiment uses a second NRUL carrier (hereinafter referred to as the second NUL carrier) as the second uplink carrier for illustration.

[0133] It should be understood that the second SUL and the second NUL are uplink carriers configured by the source cell for the target cell and the terminal device to communicate.

[0134] The target cell's cell information includes both cell-level and UE-level configurations. It should be noted that the target cell's cell-level configuration can only be modified during handover and when adding secondary cells (scells).

[0135] Optionally, if the target cell ID and the source cell ID are different, the DAPS handover message must include cell-level configuration; if the IDs are the same, the cell-level configuration can be omitted, and the terminal device inherits the cell-level configuration of the source cell.

[0136] S204, The terminal device initiates a random access procedure in a carrier indicated by the target cell information.

[0137] Specifically, when the target cell information in S203 indicates only one uplink carrier, the terminal device initiates random access on that carrier. When the target cell information indicates two uplink carriers, the second SUL carrier and the second NUL carrier, the terminal device selects one of the two uplink carriers for random access (RA). This application does not specifically limit which of the two carriers is used for random access.

[0138] Optionally, the base station may select a carrier for random access to a terminal device based on the reference signal received power (RSRP) and / or reference signal received quality (RSRQ) measurement results reported by the terminal device, or the SRS transmitted by the terminal device.

[0139] Optionally, if two uplink carriers are configured, the terminal device selects one carrier for access based on an RSRP threshold. The terminal device will only select the second SUL carrier for access if the RSRP measured by the terminal device is less than the threshold.

[0140] It should be understood that the terminal device always performs random access on a single carrier, including the uplink carrier for hybrid automatic repeat request (HARQ) acknowledgment (ACK) feedback.

[0141] Optionally, random access can be either contention-based or non-contention-based, and this application does not specifically limit this.

[0142] Optionally, the source cell can configure DAPS handover commands in information elements such as ReconfigurationWithSync and RadioBearerConfig in RRCReconfiguration.

[0143] Optionally, the parameters for the target cell random access (RA) can be included in the cell-level configuration.

[0144] Optionally, the carrier that can be reconfigured may be different from the carrier of the target cell RA. For example, if the target cell carrier includes two carriers, the second NUL and the second SUL, and the RA accesses the second NUL, it can be subsequently modified to transmit uplink signals on the second SUL carrier through RRC reconfiguration.

[0145] Optionally, when the target cell information indicates two uplink carriers, the second SUL carrier and the second NUL carrier, after the terminal device accesses the target cell, the terminal device needs to select one of the two uplink carriers to send an uplink signal.

[0146] Optionally, if two uplink carriers are configured, the terminal device transmits uplink signals on the carrier in the second SUL carrier and the second NUL carrier in which the PUCCH is configured.

[0147] Optionally, if two uplink carriers are configured, the terminal device may choose to fall back to the second SUL carrier to transmit uplink signals.

[0148] It should be noted that when a terminal receives the second DCI from the target cell, the terminal device needs to parse the second DCI based on the expected second SUL carrier and second uplink carrier. Specifically, if the target cell is configured with two carriers, the UL / SUL indicator field in the second DCI is x bits; if the target cell is configured with one carrier, the UL / SUL indicator field in the second DCI is y bits. For example, if the target cell is configured with two carriers, even if the target cell and the UE subsequently only use one carrier to transmit uplink signals, the terminal device still needs to parse the UL / SUL indicator field in the DCI based on x bits. Simply put, it needs to parse the bits corresponding to the received second DCI according to the actual number of carriers configured in the target cell.

[0149] It should be understood that the terminal device performs synchronization, cell search, RA, signal transmission and signal reception in the target cell according to the DAPS handover message in S203 and the carrier determined in S204, which will not be described in detail in this application.

[0150] Optionally, after the terminal device successfully accesses the target cell randomly, the method further includes: S205, the terminal device receives second information from the target cell. The second information includes configuration information of the second SUL carrier and / or the second NUL carrier (i.e., an example of the third carrier).

[0151] It should be understood that in this application, the source cell and the target cell simultaneously transmit uplink data during DAPS handover.

[0152] Optionally, if the target cell information required by the terminal device is configured in the DAPS handover message in S202, then the second information in this step does not need to configure the target cell information for the terminal device again.

[0153] Optionally, if the DAPS handover message in S202 configures some target cell information required by the terminal device, then the target cell can be configured with all or some of the required target cell information for the terminal device in the second information. This application does not make specific limitations on this.

[0154] S206, The terminal device sends an uplink signal to the target cell on one of the carriers indicated by the target cell information and the second information.

[0155] Optionally, if the carrier indicated by the target cell information is the same as the carrier indicated by the second information, for example, if the carrier indicated by the target cell information in S203 is the second NUL carrier and the second SUL carrier, while the carrier indicated by the second information in S205 is the second NUL carrier and the second SUL carrier, then the terminal device transmits the uplink signal on the carrier in the second NUL carrier and the second SUL carrier that is configured with PUCCH; or, the terminal device transmits the uplink signal using the second SUL carrier.

[0156] Optionally, if the carrier indicated by the target cell information is the same as the carrier indicated by the second information, for example, if the carrier indicated by the target cell information in S203 is the second SUL carrier, and the carrier indicated by the second information in S205 is the second SUL carrier, then the terminal device uses the second SUL carrier to send an uplink signal to the target cell.

[0157] Optionally, if the carrier indicated by the target cell information is different from the carrier indicated by the second information, for example, if the carrier indicated by the target cell information in S203 is the second NUL carrier and the second SUL carrier, while the carrier indicated by the second information in S205 is the second SUL carrier, even if the carrier for the terminal device to initiate random access in S204 is the second NUL, the terminal device will still send uplink signals to the target cell on the second SUL carrier, that is, the carrier indicated by the second information will be given priority.

[0158] Optionally, before the terminal device receives the first information in S204, the method further includes: S207, the terminal device sends a first capability message to the source cell. The first capability message includes indication information indicating that the SUL scenario supports DAPS handover.

[0159] The first capability message includes band combination and feature set combination. Band combination refers to the frequency band combination of NR carrier aggregation (CA), NR non-CA and / or multi-radio dual connectivity (MR-DC), while feature set combination refers to the combination of feature sets supported by the UE.

[0160] Existing standard definitions: ① Under CA, dual connectivity (DC), or single carrier conditions, Band Combination and Feature Set Combination are associated. ② A new definition for DAPS is Feature Set Combination DAPS (FSC-DAPS). If the UE supports DAPS in CA or DC, then the band combination in CA or DC is associated with FSC-DAPS. The base station can determine whether the UE supports DAPS handover using both band combination and FSC-DAPS information.

[0161] However, since the current standard does not support DAPS handover under SUL band combinations, and the fact that an SUL band combination can only have one SUL band does not meet the scenario where the source and target cells are configured with SUL carriers in different frequency bands, this application determines whether the UE supports DAPS handover by associating the SUL band combination with FSC-DAPS or by adding a new SUL band combination-DAPS.

[0162] Optionally, before the terminal device reports the first capability message, the method further includes: the terminal device receiving a capability negotiation message sent from the source cell, the capability negotiation message being used to instruct the terminal device to report the first capability message, and then the terminal device reporting the first capability message to the source cell according to the capability negotiation message.

[0163] Optionally, the frequency band combination consisting of the source cell and the target cell that support DAPS handover under SUL is reported to the source cell through the first capability message. The source cell and the target cell belong to the frequency band combination that supports SUL, and the source cell and the target cell are a subset of the frequency band combination that supports SUL.

[0164] Optionally, the terminal device will support reporting the SUL frequency band combination to the source cell via the first capability message. In addition to the source and target cells for DAPS handover, the SUL frequency band combination may also include the scell of UL CA or DL ​​CA.

[0165] Optionally, the uplink between the source and target cells can be time-division handover with a gap (GAP) in TDM, and the GAP duration is selectable. For example, if the terminal equipment has 2T capability (RF capability) and corresponding baseband processing resources (mainly the number of carriers in the source and target cells), then it supports concurrent source cell SUL 1T + target cell SUL 1T; concurrent source cell SUL 1T + target cell NUL 1T; concurrent source cell NUL 1T + target cell NUL 1T; concurrent source cell NUL 1T + target cell SUL 1T; concurrent source cell SUL 1T + target cell SUL 1T TDM 0us TDM; source cell NUL 2T and target cell SUL 1T TDM 35.7us TDM; source cell NUL 2T and target cell SUL 2T TDM 35.7~140us TDM, etc.

[0166] Optionally, before accessing the source cell, the terminal device may camp on other cells, which store the terminal device's first capability information. In this case, the source cell can also obtain the first capability information from the other cells where the terminal device previously camped. This application does not specifically limit the acquisition of the first capability information.

[0167] It should be understood that this application does not impose a specific time limit on the implementation of S207, and S207 can also be completed before S203 (i.e. before receiving the DAPS handover message).

[0168] S208, the terminal device receives third information sent by the target cell. The third information is used to instruct the terminal device to release the resources of the source cell. It can be understood that the third information is used to instruct the terminal device to disconnect the wireless communication with the source cell, and the DAPS handover ends.

[0169] This embodiment presents the basic process of implementing DAPS handover in SUL scenario. When there are multiple uplink carriers between the source cell or target cell and the terminal device, one of the carriers is selected to communicate with the source cell and the target cell respectively. This method makes full use of the terminal device's transmission channel and baseband processing resources, reduces the interruption time introduced by handover, and improves data throughput and cell edge coverage.

[0170] Below, this application presents another communication method, which is... Figure 2The difference in the corresponding embodiment is that when there are multiple uplink carriers between the source cell or target cell and the terminal device, the terminal device can compare the corresponding carrier frequencies and not release carriers with the same or similar frequencies, thereby making full use of the channel resources of the SUL carrier and improving the uplink data throughput.

[0171] See Figure 3 , Figure 3 This is a schematic flowchart of another communication method proposed in this application.

[0172] S301 and S302 and Figure 2 The processes in S201 and S203 are the same; please refer to the descriptions in S201 and S203 for details, which will not be repeated here.

[0173] S303, when at least one carrier of the source cell and at least one carrier of the target cell belong to the same frequency point or the same frequency band, an uplink signal is transmitted on one or two carriers of the source cell, and a random access procedure is initiated on one carrier of the target cell.

[0174] Optionally, the first information includes a first SUL carrier and a first NUL carrier, and the target cell information includes a second SUL carrier and a second NUL carrier. If the first SUL carrier and the first NUL carrier have the same frequency or belong to the same frequency band, and the first NUL carrier and the second NUL carrier have the same frequency or belong to the same frequency band, the terminal device transmits an uplink signal on the first SUL carrier and the first NUL carrier, and initiates a random access procedure on one of the second SUL carrier and the second NUL carrier.

[0175] Optionally, if the first information includes a first SUL carrier and a first NUL carrier, the target cell information includes a second SUL carrier, and the second SUL carrier has the same frequency point or belongs to the same frequency band as the first SUL carrier, the terminal device sends uplink signals on the first SUL carrier and the first NUL carrier, and initiates a random access procedure on the second SUL carrier.

[0176] Optionally, if the first information indicates the first SUL carrier and the first NUL carrier, the target cell information includes the second NUL carrier, and the second NUL carrier has the same frequency point or belongs to the same frequency band as the first NUL carrier, the terminal device sends uplink signals on the first SUL carrier and the first NUL carrier, and initiates a random access procedure on the second NUL carrier.

[0177] Optionally, if the target cell information includes a second SUL carrier and a second NUL carrier, the first information includes a first SUL carrier, and the second SUL carrier has the same frequency point or belongs to the same frequency band as the first SUL carrier, the terminal device sends an uplink signal on the first SUL carrier and initiates a random access procedure on one of the second SUL carrier and the second NUL carrier.

[0178] Optionally, if the target cell information includes a second SUL carrier and a second NUL carrier, the first information includes a first NUL carrier, and the second NUL carrier has the same frequency point or belongs to the same frequency band as the first NUL carrier, the terminal device sends an uplink signal on the first NUL carrier and initiates a random access procedure on one of the second SUL carrier and the second NUL carrier.

[0179] Optionally, S304, after the terminal device successfully accesses the target cell, when the target cell information includes the second SUL carrier and the second NUL carrier, when at least one carrier of the source cell and at least one carrier of the target cell belong to the same frequency point or the same frequency band, an uplink signal is transmitted on one or two carriers of the target cell.

[0180] Optionally, in step S305, the terminal device receives second information from the target cell. The second information includes configuration information for a second SUL carrier and / or a second NUL carrier (i.e., an example of a third carrier).

[0181] S306, when at least one carrier of the source cell and at least one carrier of the target cell belong to the same frequency point or the same frequency band, the terminal device transmits an uplink signal on one or two carriers of the target cell.

[0182] It should be understood that the target cell carrier configured in the target cell and the second information includes the second SUL carrier and the second NUL carrier. After the terminal device accesses the target cell, when at least one carrier of the source cell and at least one carrier of the target cell belong to the same frequency point or the same frequency band, uplink signals are transmitted on one or two carriers of the target cell.

[0183] Optionally, when the target cell carrier configured in the target cell and the second information includes the second SUL carrier and the second NUL carrier, and the first information includes the first SUL carrier and the first NUL carrier, and the first SUL carrier and the second SUL carrier have the same frequency point or belong to the same frequency band, and the first NUL carrier and the second NUL carrier have the same frequency point or belong to the same frequency band, the terminal device transmits uplink signals on the first SUL carrier, the first NUL carrier, the second SUL carrier and the second NUL carrier.

[0184] Optionally, if the target cell carrier configured in the target cell and the second information includes a second SUL carrier and a second NUL carrier, and the first information includes a first SUL carrier, and the second SUL carrier has the same frequency point or belongs to the same frequency band as the first SUL carrier, the terminal device transmits uplink signals on the second SUL carrier, the second NUL carrier and the first SUL carrier.

[0185] Optionally, when the target cell carrier configured in the target cell and the second information includes the second SUL carrier and the second NUL carrier, and the first information includes the first NUL carrier, and the second NUL carrier has the same frequency point or belongs to the same frequency band as the first NUL carrier, the terminal device transmits uplink signals on the second SUL carrier, the second NUL carrier and the first NUL carrier.

[0186] This only presents a few possible scenarios. Similarly, the same judgment can be made in other scenarios. Examples of all scenarios will not be provided here.

[0187] S307 to S308 and Figure 2 The processes in S207 to S208 are basically the same. Please refer to the descriptions in S207 to S208 for details, which will not be repeated here.

[0188] In this embodiment, the terminal device can reduce carrier release by judging whether the carrier frequency points are the same or similar, thereby improving data throughput and cell edge coverage.

[0189] It should be understood that this embodiment is specifically for determining the uplink carrier in a SUL scenario. This application also proposes another communication method that can cover multi-carrier scenarios.

[0190] The method includes: a terminal device receiving first information from a source cell, the first information indicating one or more carriers of the source cell; the terminal device receiving a dual activation protocol stack (DAPS) handover message from the source cell, the DAPS handover message including target cell information, the target cell information indicating one or more carriers of the target cell; when one carrier of the source cell and one carrier of the target cell belong to the same frequency point or the same frequency band, the terminal device transmits an uplink signal on one or two carriers of the source cell and initiates a random access procedure on one carrier of the target cell.

[0191] Furthermore, existing DAPS handover does not define the handover interruption time for uplink TDM transmission or downlink TDM reception in the source and target cells. Most UEs have limited uplink channel resources, for example, only 2T, and low-end UEs may only have 1T. If TDM handover with gaps is not defined, then the support for DAPS handover function on low-end UEs will be limited.

[0192] Therefore, this application also proposes another communication method that supports uplink time-division transmission. There is a gap between carrier switching. The terminal device transmits uplink data on the carriers of the source cell and the target cell through time-division multiplexing. In this way, the terminal device does not need to release the carrier of the source cell, thereby improving resource utilization and system data throughput.

[0193] The terminal device receives first information from the source cell, which indicates the carrier of the source cell. The carrier of the source cell includes at least one of a first auxiliary uplink SUL carrier and a first uplink carrier, wherein the first SUL carrier and the first uplink carrier share the cell identifier of the source cell. The terminal device also receives a dual-activation protocol stack (DAPS) handover message from the source cell, which includes target cell information. The target cell information indicates the carrier of the target cell, which includes at least one of a second SUL carrier and a second uplink carrier, wherein the second SUL carrier and the second uplink carrier share the cell identifier of the target cell. The terminal device then transmits uplink signals between the carriers of the source cell and the carriers of the target cell using a time-division multiplexing method based on a first time interval.

[0194] Optionally, before receiving the DAPS handover message, the terminal device sends second capability information to the source cell. The second capability information is also used to indicate the first time interval.

[0195] It should be understood that the above-described embodiment of transmitting uplink data on the carriers of the source cell and the target cell through time division multiplexing is specifically for how to use the uplink carrier in the SUL scenario. This application also proposes another communication method that can cover multi-carrier scenarios.

[0196] The method includes: receiving first information from a source cell, the first information indicating one or more carriers of the source cell; receiving a dual-activation protocol stack (DAPS) handover message from the source cell, the DAPS handover message including target cell information, the target cell information indicating one or more carriers of the target cell; and transmitting uplink signals between the carriers of the source cell and the carriers of the target cell, respectively, based on a time-division multiplexing method with a first time interval.

[0197] Optionally, before receiving the DAPS handover message, the terminal device sends second capability information to the source cell. The second capability information is also used to indicate the first time interval.

[0198] The communication method provided in this application has been described in detail above. The communication device provided in this application will be described below.

[0199] See Figure 4 , Figure 4 A schematic block diagram of the communication device 1000 provided in this application. Figure 4The communication device 1000 includes a receiving unit 1100, a transmitting unit 1200, and a processing unit 1300.

[0200] The receiving unit 1100 is configured to receive first information from the source cell, the first information indicating the carrier of the source cell, the carrier of the source cell including at least one of a first auxiliary uplink SUL carrier and a first uplink carrier, wherein the first SUL carrier and the first uplink carrier share the cell identifier of the source cell; the receiving unit 1100 is further configured to receive a dual-activation protocol stack (DAPS) handover message from the source cell, the DAPS handover message including target cell information, the target cell information indicating the carrier of the target cell, the carrier of the target cell including at least one of a second SUL carrier and a second uplink carrier, wherein the second SUL carrier and the second uplink carrier share the cell identifier of the target cell; the transmitting unit 1200 transmits an uplink signal on one carrier of the source cell; and the processing unit 1300 is configured to initiate a random access procedure on one carrier of the target cell.

[0201] Optionally, in one embodiment, the carrier of the source cell includes the first SUL carrier and the first uplink carrier; the processing unit 1300 is used to instruct the transmitting unit 1200 to transmit uplink signals only on carriers configured with a Physical Uplink Control Channel (PUCCH), wherein the carrier configured with PUCCH is either the first SUL carrier or the first uplink carrier.

[0202] Optionally, in another embodiment, the carrier of the source cell includes the first SUL carrier and the first uplink carrier; the processing unit 1300 is used to instruct the transmitting unit 1200 to transmit uplink data only in the first SUL.

[0203] Alternatively, in another embodiment, the receiving 1100 receives first downlink control information (DCI) from the source cell and parses the first DCI based on the expectations of the first SUL carrier and the first uplink carrier.

[0204] Optionally, in another embodiment, the carrier of the target cell includes the second SUL carrier and the second uplink carrier; the processing unit 1300 is used to instruct the transmitting unit 1200, after accessing the target cell, to transmit uplink signals only on the carrier configured with the Physical Uplink Control Channel (PUCCH), wherein the carrier configured with the PUCCH is the second SUL carrier or the second uplink carrier.

[0205] Optionally, in another embodiment, the carrier of the target cell includes the second SUL carrier and the second uplink carrier; after accessing the target cell, the processing unit 1300 is used to instruct the transmitting unit 1200 to transmit uplink signals only on the second SUL carrier.

[0206] Optionally, in another embodiment, the processor is further configured to: receive second downlink control information (DCI) from the target cell via the transceiver, and parse the second DCI based on the expectations of the second SUL carrier and the second uplink carrier.

[0207] Optionally, in another embodiment, the carrier of the source cell includes the first SUL carrier and the first uplink carrier; before receiving the DAPS handover message, the receiving unit 1100 is further configured to receive configuration information from the source cell, the configuration information being used to release one of the first SUL carrier and the first uplink carrier.

[0208] Optionally, in another embodiment, the carrier of the source cell includes the first SUL carrier and the first uplink carrier; the processor is further configured to receive second information from the target cell via the transceiver: the receiving unit 1100, the second information being used to indicate a third carrier of the target cell; and to transmit an uplink signal on one of the carriers indicated by the target cell information and the second information.

[0209] Optionally, in another embodiment, before receiving the first information, the sending unit 1200 is further configured to send a first capability message to the source cell, the first capability message including indication information for indicating that the SUL scenario supports DAPS handover.

[0210] In other embodiments, the units of the communication device 1000 are also used to perform the following steps and / or operations.

[0211] The transmitting unit 1200 is configured to transmit a first capability message to the source cell, the first capability message including indication information for indicating that the assisted uplink SUL scenario supports DAPS handover; the receiving unit 1100 is configured to receive first information from the source cell, the first information indicating the carrier of the source cell, the carrier of the source cell including at least one of a first assisted uplink SUL carrier and a first uplink carrier, wherein the first SUL carrier and the first uplink carrier share the cell identifier of the source cell; the receiving unit 1100 is further configured to receive a dual-activation protocol stack DAPS handover message from the source cell, the DAPS handover message including target cell information, the target cell information indicating the carrier of the target cell, the carrier of the target cell including at least one of a second SUL carrier and a second uplink carrier, wherein the second SUL carrier and the second uplink carrier share the cell identifier of the target cell.

[0212] Optionally, in one embodiment, the carrier of the source cell includes the first SUL carrier and the first uplink carrier; before receiving the DAPS handover message, the method further includes: the receiving unit 1100 is further configured to receive configuration information from the source cell, the configuration information being used to release one of the first SUL carrier and the first uplink carrier.

[0213] Optionally, in another embodiment, the carrier of the source cell includes the first SUL carrier and the first uplink carrier; the method further includes: the transmitting unit 1200, which is further configured to transmit an uplink signal on a carrier of the source cell, and the processing unit 1300, which is configured to initiate a random access procedure on a carrier of the target cell.

[0214] Optionally, in another embodiment, the carrier of the source cell includes the first SUL carrier and the first uplink carrier, and the transmission of the uplink signal on one carrier of the source cell includes: the transmission unit 1200 is further configured to transmit the uplink signal only on the carrier configured with a physical uplink control channel (PUCCH), wherein the carrier configured with PUCCH is either the first SUL carrier or the first uplink carrier.

[0215] Optionally, in another embodiment, the carrier of the source cell includes the first SUL carrier and the first uplink carrier. Transmitting an uplink signal on one carrier of the source cell includes: the transmitting unit 1200, which is further configured to transmit uplink data only on the first SUL carrier.

[0216] Optionally, in another embodiment, the receiving unit 1100 is further configured to receive first downlink control information (DCI) from the source cell and parse the first DCI based on the expectations of the first SUL carrier and the first uplink carrier.

[0217] Optionally, in another embodiment, the carrier of the target cell includes the second SUL carrier and the second uplink carrier. After accessing the target cell, the method further includes: the transmitting unit 1200 is further configured to transmit uplink signals only on the carrier configured with a physical uplink control channel (PUCCH), wherein the carrier configured with PUCCH is the second SUL carrier or the second uplink carrier.

[0218] Optionally, in another embodiment, the carrier of the target cell includes the second SUL carrier and the second uplink carrier. After accessing the target cell, the method further includes: the transmitting unit 1200 is further configured to transmit uplink signals only on the second SUL carrier.

[0219] Optionally, in another embodiment, the receiving unit 1100 is further configured to receive second downlink control information (DCI) from the target cell, and the processing unit 1300 is further configured to parse the second DCI based on the expectations of the second SUL carrier and the second uplink carrier.

[0220] Optionally, in another embodiment, after accessing the target cell, the method further includes: the receiving unit 1100 is further configured to receive second information from the target cell, the second information being used to indicate a third carrier of the target cell; the transmitting unit 1200 is further configured to transmit an uplink signal on one of the carriers indicated by the target cell information and the second information.

[0221] In other embodiments, the units of the communication device 1000 are also used to perform the following steps and / or operations.

[0222] The receiving unit 1100 is configured to receive first information from the source cell, the first information indicating the carrier of the source cell, the carrier of the source cell including at least one of a first auxiliary uplink SUL carrier and a first uplink carrier, wherein the first SUL carrier and the first uplink carrier share the cell identifier of the source cell; the receiving unit 1100 is further configured to receive a dual-activation protocol stack (DAPS) handover message from the source cell, the DAPS handover message including target cell information, the target cell information indicating the carrier of the target cell, the carrier of the target cell including at least one of a second SUL carrier and a second uplink carrier, wherein the second SUL carrier and the second uplink carrier share the cell identifier of the target cell; when at least one carrier of the source cell and at least one carrier of the target cell belong to the same frequency point or the same frequency band, the transmitting unit 1200 is configured to transmit an uplink signal on one or two carriers of the source cell, and the processing unit 1300 is configured to initiate a random access procedure on one carrier of the target cell.

[0223] Optionally, in one embodiment, when at least one carrier of the source cell and at least one carrier of the target cell belong to the same frequency point or the same frequency band, transmitting an uplink signal on one or two carriers of the source cell includes: if the first information includes the first SUL carrier and the first NUL carrier, the target cell information includes the second SUL carrier, and the second SUL carrier has the same frequency point or belongs to the same frequency band as the first SUL carrier, the transmitting unit 1200 is further configured to transmit an uplink signal on the first SUL carrier and the first NUL carrier.

[0224] Optionally, in another embodiment, when at least one carrier of the source cell and at least one carrier of the target cell belong to the same frequency point or the same frequency band, transmitting an uplink signal on one or two carriers of the source cell includes: when the first information indicates the first SUL carrier and the first NUL carrier, the target cell information includes the second NUL carrier, and the second NUL carrier has the same frequency point or belongs to the same frequency band as the first NUL carrier, the transmitting unit 1200 is further configured to transmit an uplink signal on the first SUL carrier and the first NUL carrier.

[0225] Optionally, in another embodiment, the carrier of the target cell includes the second SUL carrier and the second uplink carrier. After accessing the target cell, the method further includes: when at least one carrier of the source cell and at least one carrier of the target cell belong to the same frequency point or the same frequency band, transmitting an uplink signal on one or two carriers of the target cell.

[0226] Optionally, in another embodiment, when at least one carrier of the source cell and at least one carrier of the target cell belong to the same frequency point or the same frequency band, transmitting an uplink signal on one or two carriers of the target cell includes: when the information of the target cell includes the second SUL carrier and the second NUL carrier, the first information includes the first SUL carrier, and the second SUL carrier has the same frequency point or belongs to the same frequency band as the first SUL carrier, the transmitting unit 1200 is further configured to transmit an uplink signal on the second SUL carrier, the second NUL carrier, and the first SUL carrier.

[0227] Optionally, in another embodiment, when at least one carrier of the source cell and at least one carrier of the target cell belong to the same frequency point or the same frequency band, transmitting an uplink signal on one or two carriers of the target cell includes: when the information of the target cell includes the second SUL carrier and the second NUL carrier, the first information includes the first NUL carrier, and the second NUL carrier has the same frequency point or belongs to the same frequency band as the first NUL carrier, the transmitting unit 1200 is further configured to transmit an uplink signal on the second SUL carrier, the second NUL carrier, and the first NUL carrier.

[0228] Optionally, in another embodiment, the receiving unit 1100 is further configured to receive second downlink control information (DCI) from the target cell, and the processing unit 1300 is further configured to parse the second DCI based on the expectations of the second SUL carrier and the second uplink carrier.

[0229] Optionally, in another embodiment, before receiving the first information, the method further includes: the sending unit 1200 is further configured to send a first capability message to the source cell, the first capability message including indication information for indicating that the SUL scenario supports DAPS handover.

[0230] In other embodiments, the units of the communication device 1000 are also used to perform the following steps and / or operations.

[0231] The receiving unit 1100 is configured to receive first information from the source cell, the first information indicating one or more carriers of the source cell; the receiving unit 1100 is also configured to receive a dual-activation protocol stack (DAPS) handover message from the source cell, the DAPS handover message including target cell information, the target cell information indicating one or more carriers of the target cell; when one carrier of the source cell and one carrier of the target cell belong to the same frequency point or the same frequency band, the transmitting unit 1200 is configured to transmit an uplink signal on one or two carriers of the source cell, and the processing unit 1300 is configured to initiate a random access procedure on one carrier of the target cell.

[0232] Optionally, in one embodiment, the carrier of the target cell includes multiple carriers. After accessing the target cell, the method further includes: when at least one carrier of the source cell and at least one carrier of the target cell belong to the same frequency point or the same frequency band, the transmitting unit 1200 is further configured to transmit an uplink signal on one or two carriers of the target cell.

[0233] In other embodiments, the units of the communication device 1000 are also used to perform the following steps and / or operations.

[0234] The receiving unit 1100 is configured to receive first information from a source cell, the first information indicating the carrier of the source cell, the carrier of the source cell including at least one of a first auxiliary uplink SUL carrier and a first uplink carrier, wherein the first SUL carrier and the first uplink carrier share the cell identifier of the source cell; the receiving unit 1100 is further configured to receive a dual-activation protocol stack (DAPS) handover message from the source cell, the DAPS handover message including target cell information, the target cell information indicating the carrier of the target cell, the carrier of the target cell including at least one of a second SUL carrier and a second uplink carrier, wherein the second SUL carrier and the second uplink carrier share the cell identifier of the target cell; between the carrier of the source cell and the carrier of the target cell, the transmitting unit 1200 transmits uplink signals respectively in a time-division multiplexing manner based on a first time interval.

[0235] Optionally, in one embodiment, before receiving the DAPS handover message, the method further includes: the sending unit 1200 is further configured to send second capability information to the source cell, the second capability information being used to indicate the first time interval.

[0236] Optionally, in another embodiment, before receiving the first information, the method further includes: the sending unit 1200 is further configured to send a first capability message to the source cell, the first capability message including indication information for indicating that the SUL scenario supports DAPS handover.

[0237] In other embodiments, the units of the communication device 1000 are also used to perform the following steps and / or operations.

[0238] The receiving unit 1100 is configured to receive first information from the source cell, the first information being used to indicate one or more carriers of the source cell; the receiving unit 1100 is also configured to receive a dual-activation protocol stack (DAPS) handover message from the source cell, the DAPS handover message including target cell information, the target cell information being used to indicate one or more carriers of the target cell; between the carriers of the source cell and the carriers of the target cell, the transmitting unit transmits uplink signals respectively in a time-division multiplexing manner based on a first time interval.

[0239] Optionally, in another embodiment, before receiving the DAPS handover message, the method further includes: the sending unit 1200 is further configured to send second capability information to the source cell, the second capability information being used to indicate the first time interval.

[0240] Optionally, the receiving unit 1100 and the transmitting unit 1200 in the communication device 1000 can also be integrated into a transceiver unit, which has both receiving and transmitting functions. This is not a limitation.

[0241] In one implementation, the communication device 1000 can be the terminal device in the method embodiment. In this implementation, the receiving unit 1100 can be a receiver, and the sending unit 1200 can be a transmitter. The receiver and transmitter can also be integrated into a single transceiver.

[0242] In another implementation, the communication device 1000 can be a chip or integrated circuit in a terminal device. In this implementation, the receiving unit 1100 and the transmitting unit 1200 can be a communication interface or interface circuit. For example, the receiving unit 1100 can be an input interface or input circuit, and the transmitting unit 1200 can be an output interface or output circuit.

[0243] The processing unit 1300 can be a processing device. The functions of the processing device can be implemented in hardware or by executing corresponding software. For example, the processing device may include at least one processor and at least one memory, wherein the at least one memory is used to store a computer program, and the at least one processor reads and executes the computer program stored in the at least one memory, causing the communication device 1000 to perform the operations and / or processes performed by the terminal device in the various method embodiments.

[0244] Optionally, the processing device may consist only of a processor, with memory for storing computer programs located outside the processing device. The processor is connected to the memory via circuits / wires to read and execute the computer programs stored in the memory. Optionally, in some examples, the processing device may also be a chip or an integrated circuit.

[0245] See Figure 5 , Figure 5 A schematic structural diagram of the communication device 10 provided in this application. (See attached diagram.) Figure 5 The communication device 10 includes one or more processors 11, one or more memories 12, and one or more communication interfaces 13. The processor 11 is used to control the communication interface 13 to send and receive signals, the memory 12 is used to store computer programs, and the processor 11 is used to call and run the computer programs from the memory 12 so that the processes and / or operations executed by the terminal device in the various method embodiments of this application are executed.

[0246] For example, processor 11 may have Figure 4 The processing unit 1300 shown has the following functions, and the communication interface 13 may have Figure 4 The functions of the transmitting unit 1200 and / or receiving unit 1100 shown are as follows. Specifically, the processor 11 can be used to execute the processing or operations performed internally by the terminal device in each method embodiment, and the communication interface 13 is used to execute the transmitting and / or receiving actions performed by the terminal device in each method embodiment.

[0247] In one implementation, the communication device 10 can be the terminal device in the method embodiment. In this implementation, the communication interface 13 can be a transceiver. The transceiver can include a receiver and a transmitter. Optionally, the processor 11 can be a baseband device, and the communication interface 13 can be a radio frequency device.

[0248] In another implementation, the communication device 10 can be a chip or integrated circuit installed in the terminal device. In this implementation, the communication interface 13 can be an interface circuit or an input / output interface.

[0249] Optionally, the memory and processor in the above device embodiments can be physically independent units, or the memory can be integrated with the processor, which is not limited herein.

[0250] In addition, this application also provides a computer-readable storage medium storing computer instructions, which, when executed on a computer, cause the operations and / or processes performed by a terminal device in the various method embodiments of this application to be executed.

[0251] In addition, this application also provides a computer program product, which includes computer program code or instructions. When the computer program code or instructions are run on a computer, the operations and / or processes executed by the terminal device in the various method embodiments of this application are executed.

[0252] Furthermore, this application also provides a chip including a processor. A memory for storing a computer program is provided independently of the chip, and the processor is used to execute the computer program stored in the memory, such that operations and / or processes performed by a terminal device in any method embodiment are executed.

[0253] Furthermore, the chip may also include a communication interface. The communication interface may be an input / output interface or an interface circuit, etc. Furthermore, the chip may also include the memory.

[0254] In addition, this application also provides a communication device (e.g., a chip) including a processor and a communication interface, the communication interface being used to receive signals and transmit the signals to the processor, the processor processing the signals so that operations and / or processes performed by a terminal device in any method embodiment are executed.

[0255] Furthermore, this application also provides a communication device including at least one processor coupled to at least one memory, the at least one processor being configured to execute a computer program or instructions stored in the at least one memory, such that operations and / or processes performed by a terminal device in any method embodiment are executed.

[0256] Furthermore, this application also provides a terminal device, including a processor, a memory, and a transceiver. The memory stores a computer program, the processor calls and runs the computer program stored in the memory, and controls the transceiver to send and receive signals, so that the terminal device performs the operations and / or processes performed by the terminal device in any of the method embodiments.

[0257] The processor in this application embodiment can be an integrated circuit chip with the ability to process signals. In implementation, each step of the above method embodiment can be completed by integrated logic circuits in the processor's hardware or by instructions in software form. The processor can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. A general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this application embodiment can be directly implemented by a hardware encoding processor, or by a combination of hardware and software modules in the encoding processor. The software modules can reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory; the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method.

[0258] The memory in this application embodiment can be volatile memory or non-volatile memory, or it can include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous linked dynamic random access memory (SLDRAM), and direct rambus RAM (DRRAM). It should be noted that the memory used in the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0259] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0260] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0261] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0262] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0263] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0264] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. A, B, and C can all be singular or plural, without limitation.

[0265] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks.

[0266] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A communication method, characterized in that, include: Receive first information from the source cell, the first information being used to indicate the carrier of the source cell, the carrier of the source cell including a first auxiliary uplink SUL carrier and a first NR UL carrier, wherein the first SUL carrier and the first NRUL carrier share the cell identifier of the source cell; Receive configuration information from the source cell, the configuration information being used to release the first SUL carrier; Receive a Dual Activation Protocol Stack (DAPS) handover message from the source cell. The DAPS handover message includes target cell information, which is used to indicate the carrier of the target cell. The carrier of the target cell includes a second uplink carrier, wherein the second uplink carrier corresponds to the cell identifier of the target cell. Uplink signals are transmitted on the first NR UL carrier, and a random access procedure is initiated on the second uplink carrier.

2. The method as described in claim 1, characterized in that, The receiving of configuration information from the source cell includes: The configuration information is received before the DAPS switching message is received.

3. The method as described in claim 1 or 2, characterized in that: The transmission of uplink signals on the first NR UL carrier includes: Uplink signals are transmitted only on carriers configured with a Physical Uplink Control Channel (PUCCH), wherein the carrier configured with PUCCH is the first NR UL carrier.

4. The method as described in claim 3, characterized in that, Also includes: The first downlink control information (DCI) from the source cell is received, and the first DCI is parsed based on the expectations of the first SUL carrier and the first NRUL carrier.

5. The method according to any one of claims 1 to 3, characterized in that: After accessing the target cell, the method further includes: Uplink signals are transmitted only on carriers configured with a Physical Uplink Control Channel (PUCCH), wherein the carrier configured with PUCCH is the second uplink carrier.

6. The method as described in claim 5, characterized in that, The target cell's carrier also includes a second SUL carrier, and the method further includes: The second downlink control information (DCI) from the target cell is received, and the second DCI is parsed based on the expectations of the second SUL carrier and the second uplink carrier.

7. The method according to any one of claims 1 to 3, characterized in that: After accessing the target cell, the method further includes: Uplink signals are transmitted on the second uplink carrier among all carriers indicated by the target cell information.

8. The method according to any one of claims 1 to 3, characterized in that: Before receiving the first information, the method further includes: A first capability message is sent to the source cell, the first capability message including indication information for indicating that the SUL scenario supports DAPS handover.

9. A communication method, characterized in that, include: Send first information, the first information being used to indicate the carrier of the source cell, the carrier of the source cell including a first auxiliary uplink SUL carrier and a first NR UL carrier, wherein the first SUL carrier and the first NR UL carrier share the cell identifier of the source cell; Send configuration information, which is used to release the first SUL carrier; Send a dual-activation protocol stack (DAPS) handover message, the DAPS handover message including target cell information, the target cell information being used to indicate the carrier of the target cell, the carrier of the target cell including a second uplink carrier, wherein the second uplink carrier corresponds to the cell identifier of the target cell; Uplink signals are received on the first NR UL carrier.

10. The method as described in claim 9, characterized in that, The configuration information to be sent includes: The configuration information is sent before the DAPS switching message is sent.

11. The method as described in claim 9 or 10, characterized in that: The step of receiving uplink signals on the first NR UL carrier includes: Uplink signals are received only on carriers configured with a Physical Uplink Control Channel (PUCCH), wherein the carrier configured with PUCCH is the first NR UL carrier.

12. The method as described in claim 11, characterized in that, Also includes: Send the first downlink control information (DCI).

13. The method according to any one of claims 9 to 11, characterized in that, The target cell's carrier also includes a second SUL carrier.

14. The method according to any one of claims 9 to 11, characterized in that: Before sending the first information, the method further includes: Receive a first capability message, which includes indication information for indicating that the SUL scenario supports DAPS switching.

15. A communication device, characterized in that, include: A processor, and a transceiver coupled to the processor; wherein, The processor is used to communicate with the transceiver: Receive first information from the source cell, the first information being used to indicate the carrier of the source cell, the carrier of the source cell including a first auxiliary uplink SUL carrier and a first NR UL carrier, wherein the first SUL carrier and the first NRUL carrier share the cell identifier of the source cell; Receive configuration information from the source cell, the configuration information being used to release the first SUL carrier; Receive a Dual Activation Protocol Stack (DAPS) handover message from the source cell. The DAPS handover message includes target cell information, which is used to indicate the carrier of the target cell. The carrier of the target cell includes a second uplink carrier, wherein the second uplink carrier corresponds to the cell identifier of the target cell. Uplink signals are transmitted on the first NR UL carrier, and a random access procedure is initiated on the second uplink carrier.

16. The communication device as claimed in claim 15, characterized in that: The processor is configured to receive the configuration information via the transceiver before receiving the DAPS switching message.

17. The communication device as described in claim 15 or 16, characterized in that: The processor is configured to transmit uplink signals via the transceiver only on carriers configured with a Physical Uplink Control Channel (PUCCH), wherein the carrier configured with PUCCH is the first NR UL carrier.

18. The communication device as claimed in claim 17, characterized in that: The processor is configured to: receive first downlink control information (DCI) from the source cell via the transceiver, and parse the first DCI based on the expectations of the first SUL carrier and the first NR UL carrier.

19. The communication device according to any one of claims 15 to 17, characterized in that: The processor is also configured to, after accessing the target cell, transmit uplink signals only on a carrier configured with a Physical Uplink Control Channel (PUCCH), wherein the carrier configured with PUCCH is the second uplink carrier.

20. The communication device as claimed in claim 19, characterized in that: The target cell's carrier also includes a second SUL carrier. The processor is also configured to: receive second downlink control information (DCI) from the target cell via the transceiver, and parse the second DCI based on the expectations of the second SUL carrier and the second uplink carrier.

21. The communication device according to any one of claims 15 to 17, characterized in that: After accessing the target cell, the processor is further configured to use the transceiver to: Uplink signals are transmitted on the second uplink carrier among all carriers indicated by the target cell information.

22. The communication device as claimed in any one of claims 15 to 17, characterized in that: The processor is also used to communicate via the transceiver: Before receiving the first information, a first capability message is sent to the source cell. The first capability message includes indication information for indicating that the SUL scenario supports DAPS handover.

23. A communication device, characterized in that, include: A processor, and a transceiver coupled to the processor; wherein, The processor is used to communicate with the transceiver: Send first information, the first information being used to indicate the carrier of the source cell, the carrier of the source cell including a first auxiliary uplink SUL carrier and a first NR UL carrier, wherein the first SUL carrier and the first NR UL carrier share the cell identifier of the source cell; Send configuration information, which is used to release the first SUL carrier; Send a dual-activation protocol stack (DAPS) handover message, the DAPS handover message including target cell information, the target cell information being used to indicate the carrier of the target cell, the carrier of the target cell including a second uplink carrier, wherein the second uplink carrier corresponds to the cell identifier of the target cell; Uplink signals are received on the first NR UL carrier.

24. The communication device as claimed in claim 23, characterized in that: The processor is used to send the configuration information via the transceiver before sending the DAPS switching message.

25. The communication device as claimed in claim 23 or 24, characterized in that: The processor is configured to receive uplink signals only on carriers configured with a Physical Uplink Control Channel (PUCCH) via the transceiver, wherein the carrier configured with PUCCH is the first NR UL carrier.

26. The communication device as claimed in claim 25, characterized in that: The processor is used to transmit first downlink control information (DCI) via the transceiver.

27. The communication device as claimed in any one of claims 23 to 25, characterized in that: The processor is configured to receive a first capability message via the transceiver before sending the first information, the first capability message including indication information for indicating that the SUL scenario supports DAPS switching.

28. A communication device, characterized in that, The device includes a processor and an interface circuit, wherein the interface circuit is configured to receive computer program instructions and transmit them to the processor, and the processor is configured to execute the computer program instructions to implement the method as described in any one of claims 1-14.

29. A communication device, characterized in that, It includes at least one processor coupled to at least one memory, the at least one processor being configured to execute computer program instructions stored in the at least one memory to implement the method as described in any one of claims 1-14.

30. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when the computer program is run, implements the method as described in any one of claims 1-14.

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