Communication method and communication device

Abstract

The invention provides a communication method and a communication device. The invention provides a DAPS switching process of UE (User Equipment) in an SUL (Subscriber Identity Language) scene, namely a band combination in which the SUL is located, and the method can fully utilize receiving and sending channels and baseband processing resources of terminal equipment, reduce interruption time introduced by switching and improve data throughput and cell edge coverage.

Description

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

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

[0003] Dual active protocol stack (DAPS) handover (also known as 0ms handover) is essentially a soft handover: when the handover occurs, the user equipment (UE) needs to disconnect the radio interface signal with the source cell, including the signaling connection and data, only after successfully completing the random access of the target cell; during the handover process, the UE receives and sends signals from both the source cell and the target cell simultaneously to achieve uninterrupted services. In a normal hard handover, the UE immediately disconnects the signal with the source cell when the handover occurs. Compared with the hard handover, the DAPS handover can reduce the interruption time introduced by the handover, making the interruption time close to or equal to 0ms, and improve the reliability of the handover, providing the UE with a seamless handover communication experience.

[0004] Since the prior art only provides a method for implementing DAPS handover in a single-carrier scenario, therefore, how to implement DAPS handover in a multi-carrier scenario has become an important issue that needs urgent attention. Summary of the Invention

[0005] This application provides a communication method and a communication device, which can implement DAPS handover in the SUL scenario.

[0006] In a first aspect, a communication method is provided, including: receiving first information from a source cell, where the first information is used to indicate the carrier of the source cell, and the carrier of the source cell includes at least one of a first supplementary uplink (SUL) carrier and a first uplink carrier, where the first SUL carrier and the first uplink carrier share the cell identifier of the source cell; receiving a dual active protocol stack (DAPS) handover message from the source cell, where the DAPS handover message includes target cell information, and the target cell information is used to indicate the carrier of the target cell, and the carrier of the target cell includes at least one of a second SUL carrier and a second uplink carrier, where the second SUL carrier and the second uplink carrier share the cell identifier of the target cell; sending an uplink signal on one carrier of the source cell and initiating a random access procedure on one carrier of the target cell.

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

[0008] In combination with the first aspect, in some implementation manners of the first aspect, the carriers of the source cell include a first SUL carrier and a first uplink carrier. Transmitting an uplink signal on one carrier of the source cell includes:

[0009] Transmitting the uplink signal only on the carrier configured with the physical uplink control channel PUCCH, where the carrier configured with the PUCCH is the first SUL carrier or the first uplink carrier.

[0010] In combination with the first aspect, in some implementation manners of the first aspect, the carriers of the source cell include a first SUL carrier and a first uplink carrier. Transmitting an uplink signal on one carrier of the source cell includes: Transmitting the uplink signal only on the first SUL carrier.

[0011] In the above technical solution, when the terminal device communicates with the source cell using the SUL carrier, the data throughput and cell-edge coverage can be improved.

[0012] In combination with the first aspect, in some implementation manners of the first aspect, receive the 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.

[0013] In combination with the first aspect, in some implementation manners of the first aspect, the carriers of the target cell include a second SUL carrier and a second uplink carrier. After accessing the target cell, the method further includes: Transmitting the uplink signal only on the carrier configured with the physical uplink control channel PUCCH, where the carrier configured with the PUCCH is the second SUL carrier or the second uplink carrier.

[0014] In combination with the first aspect, in some implementation manners of the first aspect, the carriers of the target cell include a second SUL carrier and a second uplink carrier. After accessing the target cell, the method further includes: Transmitting the uplink signal only on the second SUL carrier.

[0015] In the above technical solution, when the terminal device communicates with the target cell using the SUL carrier, the data throughput and cell-edge coverage can be improved.

[0016] In combination with the first aspect, in some implementation manners of the first aspect, receive the second downlink control information DCI from the target cell, and parse the second DCI based on the expectations of the second SUL carrier and the second uplink carrier.

[0017] In combination 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, where the configuration information is used to release one of the first SUL carrier and the first uplink carrier.

[0018] In combination 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, where the second information is used to indicate a third carrier of the target cell; sending an uplink signal on one of all the carriers indicated by the target cell information and the second information.

[0019] In combination 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, where the first capability message includes indication information for indicating that the SUL scenario supports DAPS handover.

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

[0021] In the above technical solution, the terminal device reports to the source base station whether the UE supports DAPS handover in the SUL scenario, so that the receiving, sending channels and baseband processing resources of the terminal device can be utilized, and the interruption time introduced by the handover can be reduced.

[0022] In combination 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, where the configuration information is used to release one of the first SUL carrier and the first uplink carrier.

[0023] In combination 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: sending an uplink signal on one of the carriers of the source cell and initiating a random access procedure on one of the carriers of the target cell.

[0024] In combination 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:

[0025] Transmitting the uplink signal only on the carrier configured with the physical uplink control channel PUCCH, where the carrier configured with PUCCH is the first SUL carrier or the first uplink carrier.

[0026] In combination 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 the uplink signal only on the first SUL carrier.

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

[0028] In combination with the second aspect, in some implementations of the second aspect, receiving the first downlink control information DCI from the source cell and parsing the first DCI based on the expectations of the first SUL carrier and the first uplink carrier.

[0029] In combination 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 the uplink signal only on the carrier configured with the physical uplink control channel PUCCH, where the carrier configured with PUCCH is the second SUL carrier or the second uplink carrier.

[0030] In combination 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 the uplink signal only on the second SUL carrier.

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

[0032] In combination with the second aspect, in some implementations of the second aspect, receiving the second downlink control information DCI from the target cell and parsing the second DCI based on the expectations of the second SUL carrier and the second uplink carrier.

[0033] In combination with the second aspect, in some implementations of the second aspect, after accessing the target cell, the method further includes: Receiving a second piece of information from the target cell, where the second piece of information is used to indicate a third carrier of the target cell; Transmitting the uplink signal on one of all the carriers indicated by the target cell information and the second piece of information.

[0034] In a third aspect, a communication method is provided, including: receiving first information from a source cell, the first information being used to indicate a carrier of the source cell, the carrier of the source cell including at least one of a first supplementary 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; receiving a dual active 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 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 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, sending 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 the release of carriers by determining whether multiple carrier frequency points are the same or similar, thereby improving data throughput and coverage at the cell edge.

[0036] In combination with the third aspect, in some implementation manners 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, sending an uplink signal on one or two carriers of the source cell includes: when the first SUL carrier and the first non-SUL (NUL) carrier are included in the first information, the second SUL carrier is included in the target cell information, and the frequency point of the second SUL carrier is the same as or belongs to the same frequency band as the first SUL carrier, the communication device sends an uplink signal on the first SUL carrier and the first NUL carrier.

[0037] In combination with the third aspect, in some implementation manners 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, sending 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 second NUL carrier is included in the target cell information, and the frequency point of the second NUL carrier is the same as or belongs to the same frequency band as the first NUL carrier, the communication device sends an uplink signal on the first SUL carrier and the first NUL carrier.

[0038] In combination with the third aspect, in some implementation manners 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; 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, sending an uplink signal on one or two carriers of the target cell.

[0039] In combination 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 an uplink signal 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 frequency point of the second SUL carrier is the same as or belongs to the same frequency band as the first SUL carrier, the communication device transmits an uplink signal on the second SUL carrier, the second NUL carrier, and the first SUL carrier.

[0040] In combination 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 an uplink signal 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 NUL carrier, and the frequency point of the second NUL carrier is the same as or belongs to the same frequency band as the first NUL carrier, the communication device transmits an uplink signal on the second SUL carrier, the second NUL carrier, and the first NUL carrier.

[0041] In combination with the third aspect, in some implementations of the third aspect, receiving a second downlink control information DCI from the target cell and parsing the second DCI based on the expectations of the second SUL carrier and the second uplink carrier.

[0042] In combination 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, where the first capability message includes indication information for indicating support for DAPS handover in the SUL scenario.

[0043] In a fourth aspect, a communication method is provided, including: receiving first information from a source cell, where the first information is used to indicate one or more carriers of the source cell; receiving a dual active protocol stack DAPS handover message from the source cell, where the DAPS handover message includes target cell information, and the target cell information is used to indicate 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 solutions, the terminal device can reduce the release of carriers by determining whether multiple carrier frequency points are the same or similar, thereby improving the data throughput and the coverage of the cell edge.

[0045] In combination 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: 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, sending an uplink signal on one or two carriers of the target cell.

[0046] A fifth aspect provides a communication method, including: receiving first information from a source cell, the first information being used to indicate the carriers of the source cell, the carriers of the source cell including at least one of a first supplementary 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; receiving a dual active 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 the carriers of the target cell, the carriers 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; and respectively sending uplink signals between the carriers of the source cell and the carriers of the target cell based on a time-division multiplexing manner with a first time interval.

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

[0048] In combination 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 combination 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 support for DAPS handover in the SUL scenario.

[0050] A sixth aspect provides a communication method, including: receiving first information from a source cell, the first information being used to indicate one or more carriers of the source cell; receiving a 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; and respectively sending uplink signals between the carriers of the source cell and the carriers of the target cell based on a time-division multiplexing manner with a first time interval.

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

[0052] In combination 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, where the second capability information is used to indicate a first time interval.

[0053] In a seventh aspect, the present application provides a communication device, which has the functions of implementing the methods in the first aspect to the sixth aspect and any possible implementation of the first aspect to the sixth aspect. The functions can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

[0054] In an eighth aspect, the present application provides a communication device, including at least one processor, where the at least one processor is coupled to at least one memory. The at least one memory is used to store computer programs or instructions, and the at least one processor is used to call and run the computer programs or instructions from the at least one memory, so that the communication device executes the methods in the first aspect to the sixth aspect and any possible implementation of the first aspect to the sixth aspect.

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

[0056] In a ninth aspect, a processor is provided, including: an input circuit, an output circuit, and a processing circuit. The processing circuit is used to receive a signal through the input circuit and transmit the signal through the output circuit, so that any aspect of the first aspect to the sixth aspect and the method in any possible implementation of the first aspect to the sixth aspect are implemented.

[0057] In a specific implementation process, the above processor may be a chip, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be transistors, gate circuits, flip-flops, and various logic circuits, etc. The input signal received by the input circuit may be received and input by, for example, but not limited to, a receiver. The signal output by the output circuit may be output to, for example, but not limited to, a transmitter and transmitted by the transmitter, and the input circuit and the output circuit may be the same circuit, which is used as the input circuit and the output circuit at different times. The embodiments of the present application do not limit the specific implementation manners of the processor and various circuits.

[0058] In a tenth aspect, the present application provides a computer-readable storage medium, in which computer instructions are stored. When the computer instructions are run on a computer, the methods in the first aspect to the sixth aspect and any possible implementation of the first aspect to the sixth aspect are executed.

[0059] In an eleventh aspect, the present application provides a computer program product, which includes computer program code. When the computer program code runs on a computer, it causes the methods in the first aspect to the sixth aspect and any possible implementation manner among the first aspect to the sixth aspect to be executed.

[0060] In a twelfth aspect, the present application provides a chip, including a processor and a communication interface. The communication interface is used to receive a signal and transmit the signal to the processor, and the processor processes the signal so that the methods in the first aspect to the sixth aspect and any possible implementation manner among the first aspect to the sixth aspect are executed.

[0061] In a thirteenth aspect, the present application provides a communication system, including the communication device described in the eighth aspect. Description of the Drawings

[0062] Figure 1 is a schematic diagram of the application scenario of the embodiments of the present application;

[0063] Figure 2 is a schematic flowchart of a communication method proposed by the present application;

[0064] Figure 3 is a schematic flowchart of another communication method proposed by the present application;

[0065] Figure 4 is a schematic block diagram of the communication device 1000 provided by the present application;

[0066] Figure 5 is a schematic structural diagram of the communication device 10 provided by the present application. Detailed Embodiments

[0067] Next, the technical solutions in the present application will be described in conjunction with the drawings.

[0068] The technical solutions of the embodiments of the present application 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), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system, future 5th generation (5G) system or New Radio (NR), Vehicle-to-Everything (V2X), where V2X may include Vehicle-to-Network (V2N), Vehicle-to-Vehicle (V2V), Vehicle-to-Infrastructure (V2I), Vehicle-to-Pedestrian (V2P), etc., Long Term Evolution-Vehicle (LTE-V), Internet of Vehicles, Machine Type Communication (MTC), Internet of Things (IoT), Long Term Evolution-Machine (LTE-M), Machine-to-Machine (M2M), etc.

[0069] Figure 1 FIG. shows a schematic diagram of a network architecture provided by the embodiments of the present application. As Figure 1As shown, the communication system according to the embodiments of the present application may include a network device and multiple terminal devices. The network device may include one antenna or multiple antennas. Additionally, the network device may additionally include a transmitter chain and a receiver chain, which can be understood by those of ordinary skill in the art to each include multiple components related to signal transmission and reception (such as a processor, modulator, multiplexer, demodulator, demultiplexer, or antenna, etc.).

[0070] The network device can communicate with multiple terminal devices. The terminal devices in the embodiments of the present application may also be referred to as: user equipment (UE), mobile station (MS), mobile terminal (MT), access terminal, user unit, user station, mobile station, mobile platform, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user device, etc.

[0071] The terminal device can be a device that provides voice / data connectivity to users. For example, it can be a handheld device, a vehicle-mounted device, etc. with wireless connection capabilities. Currently, some examples of terminal devices are: mobile phone, tablet computer, laptop computer, palmtop computer, mobile internet device (MID), wearable device, virtual reality (VR) device, augmented reality (AR) device, wireless terminal in industrial control, wireless terminal in self-driving, wireless terminal in remote medical surgery, wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, wireless terminal in smart home, cellular phone, cordless phone, session initiation protocol (SIP) phone, wireless local loop (WLL) station, personal digital assistant (PDA), a handheld device with wireless communication capabilities, a computing device, or other processing devices connected to a wireless modem, vehicle-mounted devices, wearable devices, terminal devices in a 5G network, or terminal devices in a future evolved public land mobile network (PLMN) and / or any other suitable device for communicating on a wireless communication system. The embodiments of the present application are not limited thereto.

[0072] Among them, the wearable device can also be called a wearable intelligent device, which is the general term for devices developed by applying wearable technology to the intelligent design of daily wear, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is directly worn on the body or integrated into the user's clothes or accessories. A wearable device is not just a hardware device, but also realizes powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable intelligent devices include those with complete functions and large sizes that can achieve complete or partial functions without relying on a smartphone, such as smart watches or smart glasses, etc., and those that only focus on a certain type of application function and need to cooperate with other devices such as smartphones, such as various smart bracelets and smart jewelry for physical sign monitoring.

[0073] In addition, in the embodiments of the present application, the terminal device may also be a terminal device in the Internet of Things system. IoT is an important part of the future development of information technology. Its main technical feature is to connect items to the network through communication technology, so as to realize an intelligent network of human-machine interconnection and thing-thing interconnection.

[0074] In addition, in the embodiments of the present application, the terminal device may also include sensors such as intelligent printers, train detectors, and gas stations. The 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 the embodiments of the present application may be a device for communicating with a terminal device. The network device may be a base transceiver station (BTS) in a global system for mobile communications (GSM) system or a code division multiple access (CDMA) system, or a Node B (NB) in a wideband code division multiple access (WCDMA) system, or an evolved Node B (eNB or eNodeB) in an LTE system, or a radio controller in a cloud radio access network (CRAN) scenario, or a radio network controller (RNC), a base station controller (BSC), a home base station (e.g., home evolved Node B, or home Node B, HNB), a baseband unit (BBU). Alternatively, the network device may be a relay station, an access point, a vehicle-mounted device, a wearable device, and a network device in a future 5G network or a network device in a future evolved PLMN network, etc. It may be an access point (AP), a wireless relay node, a wireless backhaul node, a transmission point (TP), or a transmission and reception point (TRP) in a WLAN, etc. It may be a gNB or a transmission point (TRP or TP) in a new radio (NR) system, or one or a group (including multiple antenna panels) of antenna panels of a base station in a 5G system. Alternatively, it may also be a network node constituting a gNB or a transmission point, such as a baseband unit (BBU), or a distributed unit (DU), etc. The embodiments of the present application do not limit this.

[0076] In some deployments, the gNB may include a centralized unit (CU) and a DU. The gNB may also include an active antenna unit (AAU). The CU implements some functions of the gNB, and the DU implements some functions of the gNB. For example, the CU is responsible for processing non-real-time protocols and services, implementing radio resource control (RRC), and the functions of the packet data convergence protocol (PDCP) layer. The DU is responsible for processing physical layer protocols and real-time services, implementing the functions of the radio link control (RLC) layer, the media access control (MAC) layer, and the physical (PHY) layer. The AAU implements some physical layer processing functions, radio frequency processing, and related functions of the active antenna. Since the information of the RRC layer will ultimately become the information of the PHY layer, or is transformed from the information of the PHY layer, thus, in this architecture, high-layer signaling, such as RRC layer signaling, can also be considered to be sent by the DU, or sent by the DU + AAU. It can be understood that the network device may be a device including one or more of a CU node, a DU node, and an AAU node. In addition, the CU can be classified as a network device in the radio access network (RAN), or the CU can be classified as a network device in the core network (CN). This application does not make a limitation on this.

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

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

[0079] The following briefly introduces the terms involved in this application.

[0080] 1. DAPS handover (also known as 0 ms handover) is essentially a soft handover: when the handover occurs, the UE needs to disconnect the radio interface signal with the source cell, including signaling connection and data, only after successfully completing the random access of the target cell; during the handover process, the UE simultaneously receives and transmits signals from the source cell and the target cell to achieve uninterrupted service. In ordinary hard handover, the UE immediately disconnects the signal with the source cell when the handover occurs. Compared with hard handover, DAPS handover can reduce the interruption time introduced by handover, making the interruption time close to or equal to 0 ms, and improve the reliability of handover, providing the UE with a seamless handover communication experience.

[0081] 2. SUL: As an auxiliary spectrum, SUL can improve the uplink signal coverage at the cell edge and the throughput in the cell center of the UE. Specifically, in the cell center, SUL and NR UL schedule the UE to transmit uplink through the TDM method. For example, SUL and NR UL support TDM handovers such as SUL 1T / NUL 1T 0 us, or SUL 1T / NUL 2T 35.7 us - 140 us, or SUL 2T / NUL 2T 35.7 us - 140 us, etc. Compared with the scenario with only one NR UL uplink carrier, since there is an additional uplink carrier spectrum and NR UL is in the TDD mode, and SUL supports transmitting uplink in all time slots and can transmit signals in the time slots when NR UL is in the downlink, this brings a gain in uplink throughput. At the cell edge, the terminal device uses SUL to improve uplink coverage. According to simulation and empirical data, the uplink coverage of the SUL carrier at low frequency is better than that of NR UL. Therefore, using the SUL carrier to replace the NR UL carrier to transmit uplink at the cell edge can enhance the uplink signal coverage.

[0082] Regarding DAPS handover, the 3GPP standard currently has the following regulations. However, the following regulations do not involve the frequency band combination of SUL.

[0083] (1) If there is dual connectivity (DC), then before the DAPS handover, there is a radio interface signaling to notify the UE to release the SCG.

[0084] (2) Handover command, which may include DAPS handover indication, cell - specific configuration, and UE - specific configuration. Among them, the cell - specific configuration includes cell ID, frequency point, bandwidth, physical random - access channel (PRACH), common configuration of physical uplink control channel (PUCCH), common configuration of physical uplink share channel (PUSCH), etc.

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

[0086] (3) When the UE receives the DAPS handover command, if carrier aggregation (CA) exists in the original cell, the UE releases the SCELL by itself.

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

[0088] (5) When the UE receives the DAPS handover command, it performs cell search, synchronization, and random access (RA) in the target cell. After successful RA, it is allowed to modify the configuration parameters of the target cell through RRC re - configuration signaling.

[0089] (6) After successful RA in the target cell, the UE receives a radio interface signaling notification from the target cell to release the source cell, and the UE performs the processing 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 capabilities of CA; report whether the original cell and the target cell are single uplink transmission or multi-uplink transmission. UE capabilities include bandcombination, featureSetCombination, and featureSetCombinationDAPS. Among them, bandcombination refers to the frequency band combination of NR CA, NR non-CA, and / or MR-DC; featureSetCombination refers to the function set combination supported by the UE; featureSetCombinationDAPS refers to the function 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 bandcombination and featureSetCombinationDAPS.

[0091] In 3GPP R15 and 16, the SUL frequency band combinations in standalone (SA) and non-standalone (NSA) are defined, including the following configuration parameters, UE capabilities, and processing:

[0092] (1) Whether SUL and NR UL support concurrency is indicated through UE capabilities, that is, whether SRS supports concurrency with PUCCH, PUSCH, and SRS of another carrier; otherwise, time-division handover is the default.

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

[0094] (3) In NSA, if the channel bandwidth and frequency points of the LTE carrier and the SUL carrier are the same, then for the TDM handover between SUL 1T and NR UL1T, the handover time is 0 us; otherwise, for the TDM handover between SUL 1T and NR UL 1T, the handover time is 140 us. Both 0 us and 140 us are specified by the standard.

[0095] (4) For the UL TDM handover under the SA SUL frequency band combination, a maximum of 2 uplink transmissions simultaneously are supported. 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) There can be a SUL cell-level configuration only if there is a cell-level configuration of NUL.

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

[0100] ① The base station can specify any carrier for performing random access, either through PDCCH order or RRC reconfiguration.

[0101] ② If the base station does not specify and the cell-level configuration includes two carriers, then the UE selects which carrier to perform RA based on signal quality. The common configuration includes the threshold rsrp-ThresholdSSB-SUL. Only when the received power of the reference signal (reference signal received power, RSRP) measured by the UE on the downlink carrier is less than the threshold, does the UE select the SUL carrier for access.

[0102] Regarding the UL TDM handover in the SA SUL frequency band combination, up to 2T is supported, as follows:

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

[0104] (2) The TDM handover is reported to the base station through UE capabilities, and the candidate values of the capabilities are {option1, option2, both option1 and option 2}.

[0105] Optional 1 (option 1) means that if the base station configures UL TDM, then the base station cannot schedule carrier 2 in Case 1, that is, carrier 1 and carrier 2 can only be TDM and cannot be concurrent. See Table 1.

[0106] Table 1

[0107]

[0108]

[0109] Option 2 means that if the base station configures UL TDM, the base station can schedule on carrier 1 or carrier 2 alone; it can also schedule on carrier 1 and carrier 2 simultaneously, that is, it supports the concurrency of carrier 1 and carrier 2. See Table 2.

[0110] Table 2

[0111]

[0112] (3) In the case of UL TDM, the RRC specifies which carrier the handover GAP is located in. In the SA SUL scenario, the GAP can be located in the NR UL carrier or the SUL carrier, which is specified by uplinkTxSwitchingCarrier.

[0113] (4) The base station specifies the carrier that can be dynamically switched through uplinkTxSwitchingCarrier of RRC. This carrier can send up to 2T at most. Dynamic switching is only allowed to switch at most once within a single time slot (slot).

[0114] (5) In the case of UL TDM, it is allowed to introduce interruption to the downlink of carrier 1 or carrier 2 in some frequency band combinations, but some frequency band combinations are excluded. The reason is that based on different UE radio frequency structures, such as the coupling between the UL and the downlink (DL), the UL TDM handover will also introduce interruption to the downlink reception.

[0115] (6) In the case of UL TDM, no additional TDM pattern is introduced for the SA SUL frequency band combination.

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

[0117] Since the existing standards do not stipulate the relevant DAPS handover processing for the UE in the SUL scenario. Therefore, this application presents a handover method for the SUL frequency band combination, which can reduce the time interruption introduced by handover in this scenario and improve the success rate of handover at the same time.

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

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

[0120] The first information is used to indicate the carrier of the source cell. The carrier of the source cell includes at least one of a first supplementary uplink (SUL) carrier and a first uplink carrier. Among them, the first SUL carrier and the first uplink carrier share the cell identifier of the source cell. As an example, in this embodiment, the first uplink carrier is taken as the first NR UL carrier (hereinafter simply referred to as the first NUL 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 device to communicate with the source cell.

[0122] Optionally, the first information further includes source cell information (i.e., the resources of the source cell). The source cell information will be described in S203 and will not be elaborated here for the time being.

[0123] S202. The terminal device transmits an uplink signal on one 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 this carrier. When the first message indicates two uplink carriers, namely the first SUL carrier and the first NUL carrier, the terminal device needs to select one carrier from the two uplink carriers to transmit an uplink signal. Here, it can also be understood that the terminal device selects one carrier from the two uplink carriers to maintain wireless communication with the source cell.

[0125] Specifically, the cell information of the source cell includes cell - specific configuration and UE - specific configuration. Among them, the cell - level configuration parameters include cell ID, frequency point, bandwidth, PRACH channel, common configuration of PUCCH channel, common configuration of PUSCH channel, etc.; the UE - level configuration parameters include RS, dedicated configuration of PUSCH channel (PUSCH dedicated configuration), dedicated configuration of PUCCH channel (PUCCH dedicated configuration), and SRS is a type of RS.

[0126] Optionally, if two uplink carriers are configured, the terminal device uses the carrier configured with PUCCH among the first SUL carrier and the first NUL carrier to transmit an uplink signal. The carrier configured with PUCCH can be the carrier configured with the dedicated configuration of the PUCCH channel.

[0127] Optionally, the terminal device selects to fall back to the first SUL carrier to transmit an uplink signal.

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

[0129] It should be noted that the terminal receives the first downlink control information (DCI) from the source cell, and the terminal device needs to parse the first DCI based on the expectations of the first SUL carrier and the first uplink carrier. Specifically, if the source cell configures two carriers, the NUL / SUL indicator field in the first DCI is x bits; if the source cell configures one carrier, the NUL / SUL indicator field in the first DCI is y bits. For example, if the source cell configures two carriers, even if the subsequent UE only uses one of the carriers to send uplink signals in the source cell at S302, the terminal device still needs to parse the NUL / SUL indicator field in the DCI based on x bits. Simply put, it is necessary to parse the corresponding bits of the first DCI received according to the actual number of carriers configured in the source cell.

[0130] Optionally, when the carrier where 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 where 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, and the target cell information is used to indicate the carrier of the target cell. The carrier of the target cell includes at least one of the second SUL carrier and the second uplink carrier. Among them, the second SUL carrier and the second uplink carrier share the cell identifier of the target cell. As an example, in this embodiment, the second uplink carrier is taken as the second NRUL carrier (hereinafter simply referred to as the second NUL carrier) for illustration.

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

[0134] The cell information of the target cell includes cell-level and UE-level configurations. It should be noted that the cell-level configuration of the target cell can only be modified during handover and secondary cell (scell) addition.

[0135] Optionally, if the target cell ID is different from the source cell ID, the cell-level configuration must be included in the DAPS handover message; if the IDs are the same, the cell-level configuration may be missing, 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 this carrier. When the target cell information indicates two uplink carriers, namely the second SUL carrier and the second NUL carrier, the terminal device selects one of the two uplink carriers for random access (RA). Which carrier to use for random access is not specifically limited in this application.

[0138] Optionally, the base station preferentially selects a carrier based on the measurement result report of the received power of the reference signal (reference signal received power, RSRP) and / or the received quality of the reference signal (reference signal received quality, RSRQ) reported by the terminal device, or other content such as the transmitted SRS, and designates the terminal device to perform random access on this carrier.

[0139] Optionally, if two uplink carriers are configured, the terminal device selects an access carrier through the RSRP threshold. Only when the RSRP measured by the terminal device is less than the threshold, does the terminal device select the second SUL carrier for access.

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

[0141] Optionally, the random access can be of a contention or non-contention type, which is not specifically limited in this application.

[0142] Optionally, the source cell can configure the DAPS handover command in information elements (information element IE) such as ReconfigurationWithSync and RadioBearerConfig in RRCReconfiguration.

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

[0144] Optionally, the carrier allowing reconfiguration may be different from the carrier of the target cell RA. For example, the target cell carrier includes two carriers, a second NUL and a second SUL. RA accesses on the second NUL, and subsequently, the uplink signal can be modified to be sent on the second SUL carrier through RRC reconfiguration.

[0145] Optionally, when the target cell information indicates two uplink carriers, namely a second SUL carrier and a 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 the uplink signal.

[0146] Optionally, if two uplink carriers are configured, the terminal device uses the carrier configured with PUCCH among the second SUL carrier and the second NUL carrier to send the uplink signal.

[0147] Optionally, if two uplink carriers are configured, the terminal device selects to fall back to the second SUL carrier to send the uplink signal.

[0148] It should be noted that when the terminal receives the second DCI from the target cell, the terminal device needs to parse the second DCI based on the expectations of the second SUL carrier and the second uplink carrier. Specifically, if the target cell is configured with two carriers, the UL / SUL indication field in the second DCI is x bits (bit), and if the target cell is configured with one carrier, the UL / SUL indication field in the second DCI is y bit. For example: if the target cell is configured with two carriers, even if the subsequent target cell and the UE only use one of the carriers to send the uplink signal, the terminal device still needs to parse the UL / SUL indicator field in the DCI based on x bit. Simply put, it is necessary to parse the corresponding bits of 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 elaborated in this application.

[0150] Optionally, after the terminal device successfully performs random access to the target cell, the method further includes: S205, the terminal device receives the second information from the target cell. The second information includes the 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 the DAPS handover of the source cell and the target cell in this application, there is uplink transmission simultaneously.

[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 may not need to configure the target cell information for the terminal device in this step.

[0153] Optionally, if some of the target cell information required by the terminal device is configured in the DAPS handover message in S202, then the target cell may configure all or the required part of the 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 all 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, the carrier indicated by the target cell information in S203 is the second NUL carrier and the second SUL carrier, and the carrier indicated by the second information in S205 is the second NUL carrier and the second SUL carrier, then the terminal device sends an uplink signal on the carrier configured with PUCCH among the second NUL carrier and the second SUL carrier; or, the terminal device uses the second SUL carrier to send an uplink signal.

[0156] Optionally, if the carrier indicated by the target cell information is the same as the carrier indicated by the second information. For example, 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, the carrier indicated by the target cell information in S203 is the second NUL carrier and the second SUL carrier, and the carrier indicated by the second information in S205 is the second SUL carrier. Even if the carrier on which the terminal device initiates random access in S204 is the second NUL, the terminal device still sends an uplink signal to the target cell on the second SUL carrier, that is, the carrier indicated by the second information is preferentially satisfied.

[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 for indicating support for DAPS handover in the SUL scenario.

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

[0160] The existing standard defines that: ① Under CA, dual connectivity (DC), or single carrier, BandCombination and FeatureSetCombination are associated. ② A new featureSetCombinationDAPS (FSC-DAPS) is defined for DAPS. If the UE supports DAPS under CA or DC, then the band combination of CA or DC is associated with FSC-DAPS. The base station can determine whether the UE supports DAPS handover based on the two pieces of information, band combination + FSC-DAPS.

[0161] However, since the current standard does not support DAPS handover in the SUL band combination, and the SUL band combination has at most one SUL band that does not meet the scenario where the source and target cells are both configured with SUL carriers and belong to different frequency bands. Therefore, in this application, it is determined whether the UE supports DAPS handover by associating the SUL band combination with FSC-DAPS or adding a new band combination of SULbandcombination-DAPS.

[0162] Optionally, before the terminal device reports the first capability message, the method further includes: the terminal device receives a capability negotiation message sent by the source cell, and the capability negotiation message is used to instruct the terminal device to report the first capability message. After that, the terminal device reports the first capability message to the source cell according to the capability negotiation message.

[0163] Optionally, the band combination composed 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 band combination that supports SUL, and the source cell and the target cell are subsets of the band combination that supports SUL.

[0164] Optionally, the terminal device reports the frequency band combination supporting SUL to the source cell via a first capability message. The frequency band combination of SUL may include, in addition to the source cell and the target cell for DAPS handover, the sCells of UL CA or DL CA.

[0165] Optionally, for the uplink of the source cell and the target cell, it can be time-division handover with GAP in TDM, and the GAP time length is optional. For example: If the terminal device has the capability of 2T (radio frequency capability) and the corresponding baseband processing resources (mainly the number of carriers of the source cell and the target cell), then it supports the concurrency of SUL 1T of the source cell + SUL 1T of the target cell; the concurrency of SUL 1T of the source cell + NUL 1T of the target cell; the concurrency of NUL 1T of the source cell + NUL 1T of the target cell; the concurrency of NUL 1T of the source cell + SUL 1T of the target cell; the TDM of SUL 1T of the source cell + SUL 1T of the target cell with 0 us TDM; the TDM of NUL 2T of the source cell and SUL 1T of the target cell with 35.7 us TDM; the TDM of NUL 2T of the source cell and SUL 2T of the target cell with 35.7 - 140 us TDM, etc.

[0166] Optionally, before accessing the source cell, the terminal device may camp on other cells, and the first capability message of the terminal device is stored in the other cells. In this case, the source cell can also obtain the first capability message from other cells where the terminal device camped before. This application does not make specific limitations on the acquisition of the first capability message.

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

[0168] S208, the terminal device receives the 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 gives the basic process of implementing DAPS handover in the SUL scenario. In the case where there are multiple uplink carriers between the source cell or the target cell and the terminal device, one carrier is respectively selected to communicate with the source cell and the target cell. This method makes full use of the terminal device's transmission channels and baseband processing resources, reduces the interruption time introduced by handover, and improves data throughput and cell-edge coverage.

[0170] Next, this application gives another communication method, which is the same as Figure 2The difference from the corresponding embodiment is that when there are multiple uplink carriers between the source cell or the target cell and the terminal device, the terminal device can compare the corresponding carrier frequencies and does not release the carriers with the same or similar frequencies, so as to make full use of the channel resources of the SUL carrier and improve the uplink data throughput.

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

[0172] S301 and S302 are the same as the processes of S201 and S203 in Figure 2 For details, refer to the descriptions in S201 and S203, which will not be elaborated 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, send an uplink signal on one or two carriers of the source cell and initiate a random access procedure on one carrier of the target cell.

[0174] Optionally, when the first information includes a first SUL carrier and a first NUL carrier, the information of the target cell includes a second SUL carrier and a second NUL carrier, and the frequency of the first SUL carrier is the same as or belongs to the same frequency band as the first SUL carrier, and the frequency of the first NUL carrier is the same as or belongs to the same frequency band as the second NUL carrier, the terminal device sends 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, 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 frequency of the second SUL carrier is the same as 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 the first NUL carrier and initiates a random access procedure on the second SUL carrier.

[0176] Optionally, when the first information indicates a first SUL carrier and a first NUL carrier, the information of the target cell includes a second NUL carrier, and the frequency of the second NUL carrier is the same as or belongs to the same frequency band as the first NUL carrier, the terminal device sends an uplink signal on the first SUL carrier and the first NUL carrier and initiates a random access procedure on the second NUL carrier.

[0177] Optionally, in the information of the target cell, a second SUL carrier and a second NUL carrier are included. When the first information includes a first SUL carrier and the second SUL carrier has the same frequency point as or belongs to the same frequency band as the first SUL carrier, the terminal device transmits 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, in the information of the target cell, a second SUL carrier and a second NUL carrier are included. When the first information includes a first NUL carrier and the second NUL carrier has the same frequency point as or belongs to the same frequency band as the first NUL carrier, the terminal device transmits 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 performs random access to the target cell, when the target cell information includes a second SUL carrier and a second NUL carrier, and 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.

[0180] Optionally, S305, 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 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 carriers configured in the target cell and the second information include a second SUL carrier and a 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, the terminal device transmits an uplink signal on one or two carriers of the target cell.

[0183] Optionally, when the target cell carriers 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 a first NUL carrier, and the first SUL carrier has the same frequency point as or belongs to the same frequency band as the second SUL carrier, and the first NUL carrier has the same frequency point as or belongs to the same frequency band as the second NUL carrier, the terminal device transmits an uplink signals on the first SUL carrier, the first NUL carrier, the second SUL carrier, and the second NUL carrier.

[0184] Optionally, 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 SUL carrier, and the second SUL carrier has the same frequency point as the first SUL carrier or belongs to the same frequency band, the terminal device transmits an uplink signal 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 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 as the first NUL carrier or belongs to the same frequency band, the terminal device transmits an uplink signal on the second SUL carrier, the second NUL carrier, and the first NUL carrier.

[0186] Only several possible scenarios are given here. Similarly, the above judgment can also be made in other scenarios, and all cases will not be exemplified one by one here.

[0187] S307 to S308 are basically the same as Figure 2 the processes of S207 to S208 in, and for specific descriptions, please refer to the descriptions in S207 to S208, which will not be elaborated here.

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

[0189] It should be understood that this embodiment is specific to how to determine the uplink carrier in the SUL scenario. The present application also proposes another communication method, which can cover multi-carrier scenarios.

[0190] The method includes: the terminal device receives first information from the source cell, and the first information is used to indicate one or more carriers of the source cell; the terminal device receives a dual active protocol stack DAPS handover message from the source cell, and the DAPS handover message includes target cell information, and the target cell information is used to indicate 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] In addition, for existing DAPS handovers, the handover interruption time for uplink TDM transmission or downlink TDM reception between the source cell and the target cell has not been defined. The number of uplink channel resources of most UEs is limited. For example, there are only 2T, and low-end UEs even only have 1T. If a TDM handover with a GAP is not defined, the support for the DAPS handover function on low-end UEs will be limited.

[0192] Therefore, the present application also proposes another communication method, which supports uplink time-division transmission. There is a GAP during the handover between carriers. The terminal device transmits uplink data on the carriers of the source cell and the target cell through time-division multiplexing. Then, the terminal device can not 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. The first information is used to indicate the carrier of the source cell. The carrier of the source cell includes at least one of a first supplementary uplink (SUL) carrier and a first uplink carrier. Among them, the first SUL carrier and the first uplink carrier share the cell identifier of the source cell; the terminal device receives a dual active protocol stack (DAPS) handover message from the source cell. The DAPS handover message includes target cell information. The target cell information is used to indicate 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. Among them, 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, uplink signals are respectively transmitted based on time-division multiplexing with a first time interval.

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

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

[0196] This method includes: receiving first information from the source cell, where the first information is used to indicate one or more carriers of the source cell; receiving a DAPS handover message from the source cell, where the DAPS handover message includes target cell information, and the target cell information is used to indicate one or more carriers of the target cell; between the carrier of the source cell and the carrier of the target cell, uplink signals are respectively transmitted based on time-division multiplexing with a first time interval.

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

[0198] The above provides a detailed description of the communication method provided by the present application. Next, the communication device provided by the present application is introduced.

[0199] See Figure 4 , Figure 4 which is a schematic block diagram of the communication device 1000 provided by the present application. As Figure 4, the 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 a source cell, where the first information is used to indicate a carrier of the source cell, and the carrier of the source cell includes at least one of a first supplementary uplink (SUL) carrier and a first uplink carrier. Among them, 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 active protocol stack (DAPS) handover message from the source cell, and the DAPS handover message includes target cell information, where the target cell information is used to indicate a carrier of the target cell, and the carrier of the target cell includes at least one of a second SUL carrier and a second uplink carrier. Among them, 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 configured to instruct the transmitting unit 1200 to transmit the uplink signal only on the carrier configured with a physical uplink control channel (PUCCH), where the carrier configured with PUCCH is 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 configured to instruct the transmitting unit 1200 to transmit uplink data only on the first SUL.

[0203] Optionally, in another embodiment, the receiver 1100 receives first downlink control information (DCI) from the source cell and resolves 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 configured to instruct the transmitting unit 1200 to transmit the uplink signal only on the carrier configured with a physical uplink control channel (PUCCH) after accessing the target cell, where the carrier configured with 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 configured 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, through the transceiver: receive second downlink control information DCI from the target cell, 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, where the configuration information is 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, through the transceiver: the receiving unit 1100 is further configured to receive second information from the target cell, where the second information is used to indicate a third carrier of the target cell; transmit uplink signals on one of all the carriers indicated by the target cell information and the second information.

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

[0210] In some other solutions, each unit of the communication device 1000 is further configured to perform the following steps and / or operations.

[0211] A sending unit 1200 is configured to send a first capability message to a source cell, where the first capability message includes indication information for indicating that the supplementary uplink (SUL) scenario supports dual active protocol stack (DAPS) handover; a receiving unit 1100 is configured to receive first information from the source cell, where the first information is used to indicate a carrier of the source cell, and the carrier of the source cell includes at least one of a first SUL carrier and a first uplink carrier, and wherein the first SUL carrier and the first uplink carrier share a cell identifier of the source cell; the receiving unit 1100 is further configured to receive a DAPS handover message from the source cell, where the DAPS handover message includes target cell information, and the target cell information is used to indicate a carrier of the target cell, and the carrier of the target cell includes at least one of a second SUL carrier and a second uplink carrier, and wherein the second SUL carrier and the second uplink carrier share a 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, where the configuration information is 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 sending unit 1200 is further configured to send an uplink signal on one carrier of the source cell, and a processing unit 1300 is configured to initiate a random access procedure on one 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 sending the uplink signal on one carrier of the source cell includes: the sending unit 1200 is further configured to send the uplink signal only on a carrier configured with a physical uplink control channel (PUCCH), where the carrier configured with the PUCCH is 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, and sending the uplink signal on one carrier of the source cell includes: the sending unit 1200 is further configured to send 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 carriers of the target cell include 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 an uplink signal only on a carrier configured with a physical uplink control channel PUCCH, where the carrier configured with PUCCH is the second SUL carrier or the second uplink carrier.

[0218] Optionally, in another embodiment, the carriers of the target cell include 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 an uplink signal 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, where the second information is 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 all the carriers indicated by the target cell information and the second information.

[0221] In some other solutions, each unit of the communication device 1000 is further configured to perform the following steps and / or operations.

[0222] A receiving unit 1100, configured to receive first information from a source cell, where the first information is used to indicate a carrier of the source cell, and the carrier of the source cell includes at least one of a first supplementary 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 active protocol stack (DAPS) handover message from the source cell, and the DAPS handover message includes target cell information, where the target cell information is used to indicate a carrier of the target cell, and 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; 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, a transmitting unit 1200 is configured to transmit an uplink signal on one or two carriers of the source cell, and a 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: when the first information includes the first SUL carrier and the first non-SUL (NUL) carrier, the target cell information includes the second SUL carrier, and the second SUL carrier has the same frequency point as 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 as 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: including the second SUL carrier and the second NUL carrier in the information of the target cell, including the first SUL carrier in the first information, and when the second SUL carrier has the same frequency point as 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: including the second SUL carrier and the second NUL carrier in the information of the target cell, including the first NUL carrier in the first information, and when the second NUL carrier has the same frequency point as 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 transmitting unit 1200 is further configured to send a first capability message to the source cell, and the first capability message includes indication information for indicating support for DAPS handover in the SUL scenario.

[0230] In some other solutions, each unit of the communication device 1000 is further configured to perform the following steps and / or operations.

[0231] A receiving unit 1100 is configured to receive first information from a source cell, where the first information is used to indicate one or more carriers of the source cell; the receiving unit 1100 is further configured to receive a dual active protocol stack (DAPS) handover message from the source cell, where the DAPS handover message includes target cell information, and the target cell information is used to indicate 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, a transmitting unit 1200 is configured to transmit an uplink signal on one or two carriers of the source cell, and a processing unit 1300 is configured to initiate a random access procedure on one carrier of the target cell.

[0232] Optionally, in one embodiment, the carriers of the target cell include 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 some other solutions, each unit of the communication device 1000 is further configured to perform the following steps and / or operations.

[0234] A receiving unit 1100 is configured to receive first information from a source cell, where the first information is used to indicate the carriers of the source cell, and the carriers of the source cell include at least one of a first supplementary uplink (SUL) carrier and a first uplink carrier, where 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 DAPS handover message from the source cell, where the DAPS handover message includes target cell information, and the target cell information is used to indicate the carriers of the target cell, and the carriers of the target cell include at least one of a second SUL carrier and a second uplink carrier, where the second SUL carrier and the second uplink carrier share the cell identifier of the target cell; between the carriers of the source cell and the carriers of the target cell, the transmitting unit 1200 transmits uplink signals based on a time-division multiplexing manner with a first time interval.

[0235] Optionally, in one embodiment, before receiving the DAPS handover message, the method further includes: the transmitting unit 1200 is further configured to send second capability information to the source cell, and the second capability information is 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, where the first capability message includes indication information for indicating that the SUL scenario supports DAPS handover.

[0237] In some other solutions, each unit of the communication device 1000 is further configured to perform the following steps and / or operations.

[0238] The receiving unit 1100 is configured to receive first information from the source cell, where the first information is used to indicate one or more carriers of the source cell; the receiving unit 1100 is further configured to receive a dual active protocol stack (DAPS) handover message from the source cell, where the DAPS handover message includes target cell information, and the target cell information is 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 sending unit sends uplink signals based on a time-division multiplexing manner with 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, where the second capability information is used to indicate the first time interval.

[0240] Optionally, the receiving unit 1100 and the sending unit 1200 in the communication device 1000 may also be integrated into a transceiver unit, which has both receiving and sending functions, and this is not limited herein.

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

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

[0243] The processing unit 1300 may be a processing device. Among them, the functions of the processing device may be implemented by hardware or by hardware executing corresponding software. For example, the processing device may include at least one processor and at least one memory. Among them, the at least one memory is used to store computer programs, and the at least one processor reads and executes the computer programs stored in the at least one memory, so that the communication device 1000 performs the operations and / or processes executed by the terminal device in each method embodiment.

[0244] Optionally, the processing device may only include a processor, and the memory for storing computer programs is located outside the processing device. The processor is connected to the memory through a circuit / wire 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 which is a schematic structural diagram of the communication device 10 provided in this application. As 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 each method embodiment of this application are executed.

[0246] For example, the processor 11 may have Figure 4 the functions of the processing unit 1300 shown in Figure 4 , and the communication interface 13 may have

[0247] the functions of the sending unit 1200 and / or the receiving unit 1100 shown in

[0248] Specifically, the processor 11 may be used to execute the processing or operations performed inside the terminal device in each method embodiment, and the communication interface 13 is used to perform the sending and / or receiving actions performed by the terminal device in each method embodiment.

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

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

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

[0250] In addition, the present application also provides a computer-readable storage medium, in which computer instructions are stored. When the computer instructions run on a computer, the operations and / or processes executed by the terminal device in each method embodiment of the present application are executed.

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

[0252] In addition, the present application also provides a chip, which includes a processor. A memory for storing a computer program is provided independently of the chip, and the processor is configured to execute the computer program stored in the memory so that the operations and / or processes executed by the terminal device in any one method embodiment are executed.

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

[0254] In addition, the present application also provides a communication device (for example, it may be a chip), which includes a processor and a communication interface. The communication interface is configured to receive a signal and transmit the signal to the processor, and the processor processes the signal so that the operations and / or processes executed by the terminal device in any one method embodiment are executed.

[0255] In addition, the present application also provides a communication device, which includes at least one processor. The at least one processor is coupled to at least one memory. The at least one processor is configured to execute the computer program or instructions stored in the at least one memory so that the operations and / or processes executed by the terminal device in any one method embodiment are executed.

[0256] In addition, the present application also provides a terminal device, which includes a processor, a memory, and a transceiver. Among them, the memory is configured to store a computer program, and the processor is configured to call and run the computer program stored in the memory and control the transceiver to transmit and receive signals, so that the terminal device executes the operations and / or processes executed by the terminal device in any one method embodiment.

[0257] The processor in the embodiments of the present application may be an integrated circuit chip with the ability to process signals. During implementation, the steps of the above method embodiments may be completed by the integrated logic circuit in the hardware of the processor or instructions in the form of software. The processor may 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, discrete hardware components. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application may be directly implemented as being executed and completed by the hardware-encoded processor, or implemented and completed by a combination of the hardware and software modules in the encoded processor. The software module may be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. This storage medium is located in the memory, and the processor reads the information in the memory and combines its hardware to complete the steps of the above method.

[0258] The memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable ROM (PROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), or a flash memory. The volatile memory may be a 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 RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM), and direct rambus RAM (DRRAM). It should be noted that the memory of 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 of ordinary skill in the art can realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or by a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0260] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be described herein again.

[0261] In several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection to each other can be through some interfaces. The indirect coupling or communication connection of the devices or units can be in electrical, mechanical, or other forms.

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

[0263] In addition, in each embodiment of this application, the functional units can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit.

[0264] The term "and / or" in this application is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Among them, A, B, and C can all be singular or plural, without limitation.

[0265] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the essence of the technical solution of this application, or the part that contributes to the prior art, or this part 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 enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of this application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, ROM, RAM, magnetic disks, or optical discs that can store program codes.

[0266] The above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed in this application can easily think of changes or substitutions, which should all be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. A communication method, characterized in that, Including: Receiving first information from a source cell, the first information being used to indicate a carrier of the source cell, the carrier of the source cell including a first supplementary uplink (SUL) carrier and a first New Radio (NR) uplink carrier, wherein the first SUL carrier and the first NR uplink carrier share the cell identifier of the source cell; Receiving a dual active 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 a carrier of the target cell, the carrier of the target cell including 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; Selecting one carrier from the first SUL carrier and the first NR uplink carrier to transmit an uplink signal, and selecting one carrier from the second SUL carrier and the second uplink carrier to initiate a random access procedure.

2. The method according to claim 1, wherein: Sending the uplink signal on one carrier from the first SUL carrier and the first NR uplink carrier includes: Sending the uplink signal only on a carrier configured with a physical uplink control channel (PUCCH), wherein the carrier configured with the PUCCH is the first SUL carrier or the first NR uplink carrier.

3. The method according to claim 1, wherein: Sending the uplink signal on one carrier from the first SUL carrier and the first NR uplink carrier includes: Sending the uplink signal only on the first SUL carrier.

4. The method according to claim 2 or 3, characterized in that, Further including: Receiving first downlink control information (DCI) from the source cell, and parsing the first DCI based on the expectations of the first SUL carrier and the first NR uplink carrier.

5. The method according to any one of claims 1 to 3, wherein: After accessing the target cell, the method further includes: Sending the uplink signal only on a carrier configured with a physical uplink control channel (PUCCH), wherein the carrier configured with the PUCCH is the second SUL carrier or the second uplink carrier.

6. The method according to any one of claims 1 to 3, wherein: After accessing the target cell, the method further includes: Sending the uplink signal only on the second SUL carrier.

7. The method according to claim 5, wherein Further including: Receiving second downlink control information (DCI) from the target cell, and parsing the second DCI based on the expectations of the second SUL carrier and the second uplink carrier.

8. The method according to any one of claims 1 to 3, wherein: 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 carrier from the first SUL carrier and the first NR uplink carrier.

9. The method according to any one of claims 1 to 3, wherein: After accessing the target cell, the method further includes: Sending the uplink signal on one carrier among all carriers indicated by the target cell information.

10. The method according to any one of claims 1 to 3, characterized in that: Before receiving the first information, the method further includes: Sending a first capability message to the source cell, where the first capability message includes indication information for indicating that the SUL scenario supports DAPS handover.

11. A communication device, characterized in that, Including: A processor, and a transceiver coupled to the processor; wherein, The processor is configured to, through 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 supplementary 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; Receive a dual active 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 the carrier of the target cell, the carrier of the target cell including 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; Select one carrier from the first SUL carrier and the first NR UL carrier to send an uplink signal, and select one carrier from the second SUL carrier and the second uplink carrier to initiate a random access procedure.

12. The communication device according to claim 11, characterized in that: The processor is configured to, through the transceiver: send an uplink signal only on a carrier configured with a physical uplink control channel PUCCH, where the carrier configured with PUCCH is the first SUL carrier or the first NR UL carrier.

13. The communication device according to claim 11, characterized in that: The processor is configured to, through the transceiver: send an uplink signal only on the first SUL.

14. The communication device according to claim 12 or 13, characterized in that: The processor is configured to, through the transceiver: 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 NR UL carrier.

15. The communication device according to any one of claims 11 to 13, characterized in that: The processor is further configured to, through the transceiver: after accessing the target cell, send an uplink signal only on a carrier configured with a physical uplink control channel PUCCH, where the carrier configured with PUCCH is the second SUL carrier or the second uplink carrier.

16. The communication device according to any one of claims 11 to 13, characterized in that: The processor is further configured to, through the transceiver: After accessing the target cell, send an uplink signal only on the second SUL carrier.

17. The communication device according to claim 15, characterized in that: The processor is further configured to, through the transceiver: receive second downlink control information DCI from the target cell, and parse the second DCI based on the expectations of the second SUL carrier and the second uplink carrier.

18. The communication device according to any one of claims 11 to 13, characterized in that: The processor is further configured to, through the transceiver: before receiving the DAPS handover message, receive configuration information from the source cell, where the configuration information is used to release one of the first SUL carrier and the first NR UL carrier.

19. The communication device according to any one of claims 11 to 13, characterized in that: After accessing the target cell, the processor is further configured to, through the transceiver: Transmit an uplink signal on one of all the carriers indicated by the target cell information.

20. The communication device according to any one of claims 11 to 13, characterized in that: The processor is further configured to, through the transceiver: Before receiving the first information, send a first capability message to the source cell, where the first capability message includes indication information for indicating that the SUL scenario supports DAPS handover.

21. A communication device, characterized in that, Comprising 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 run the computer program instructions to implement the method according to any one of claims 1-10.

22. A communication device, characterized in that, Comprising at least one processor, the at least one processor being coupled to at least one memory, and the at least one processor being configured to run computer program instructions stored in the at least one memory to implement the method according to any one of claims 1-10.

23. A computer-readable storage medium, characterized in that, A computer program is stored in the computer-readable storage medium, and when the computer program is run, the method according to any one of claims 1-10 is implemented.

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