Communication method and communication device

Abstract

The present application provides a communication method and a communication device. A DAPS switching process of a UE in a SUL scenario, i.e., a band combination where the SUL is located, is provided. The method can make full use of the receiving and transmitting channels and baseband processing resources of the terminal device, reduce the interruption time introduced by the switching, and improve the data throughput and cell edge coverage.

Description

Technical Field

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

[0002] Dual active protocol stack (DAPS) switching (also known as 0ms switching) is essentially a soft switching: when switching occurs, the user equipment (UE) needs to disconnect the air interface signal with the source cell only after successfully completing the random access of the target cell, including signaling connection and data; during the switching process, the UE simultaneously receives and sends signals from the source cell and the target cell to achieve uninterrupted service. An ordinary hard switching is that the UE immediately disconnects the signal from the source cell when the switching occurs. Compared with hard switching, DAPS switching can reduce the interruption time introduced by the switching, making the interruption time close to or equal to 0ms, and improve the reliability of the switching, providing the UE with a seamless switching communication experience.

[0003] Since the prior art only provides a method for implementing DAPS switching in a single-carrier scenario, how to implement DAPS switching in a multi-carrier scenario becomes an important issue that requires urgent attention. Summary of the invention

[0004] The present application provides a communication method and a communication device, which can implement DAPS switching in a SUL scenario.

[0005] In a first 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 auxiliary uplink SUL carrier and a first uplink carrier, wherein the first SUL carrier and the first uplink carrier share a cell identifier of the source cell; receiving a dual activation protocol stack DAPS switching message from the source cell, the DAPS switching 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; sending an uplink signal on a carrier of the source cell, and initiating a random access process on a carrier of the target cell.

[0006] In the above technical solution, when there are multiple uplink carriers between the source cell or the target cell and the terminal device, one of the carriers is selected to communicate with the source cell and the target cell respectively. This method can utilize the terminal device's receiving, sending channels and baseband processing resources to reduce the interruption time introduced by switching.

[0007] 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, and sending an uplink signal on one carrier of the source cell includes:

[0008] An uplink signal is sent only on a carrier configured with a physical uplink control channel PUCCH, wherein the carrier configured with the PUCCH is a first SUL carrier or a first uplink carrier.

[0009] 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, and sending an uplink signal on one carrier of the source cell includes: sending an uplink signal only on the first SUL carrier.

[0010] In the above technical solution, the terminal device uses the SUL carrier to communicate with the source cell, which can improve data throughput and cell edge coverage.

[0011] In combination with the first aspect, in some implementations of the first aspect, first downlink control information DCI is received from a source cell, and the first DCI is parsed based on expectations of the first SUL carrier and the first uplink carrier.

[0012] In combination with the first aspect, in certain implementations of the first aspect, the carrier of the target cell includes a second SUL carrier and a second uplink carrier. After accessing the target cell, the method also includes: sending an uplink signal only on a carrier configured with a physical uplink control channel PUCCH, wherein the carrier configured with the PUCCH is a second SUL carrier or a second uplink carrier.

[0013] In combination with the first aspect, in some implementations of the first aspect, the carrier of the target cell includes a second SUL carrier and a second uplink carrier, and after accessing the target cell, the method further includes: sending an uplink signal only on the second SUL carrier.

[0014] In the above technical solution, the terminal device uses the SUL carrier to communicate with the target cell, which can improve data throughput and cell edge coverage.

[0015] In combination with the first aspect, in certain implementations of the first aspect, second downlink control information DCI is received from the target cell, and the second DCI is parsed based on expectations of the second SUL carrier and the second uplink carrier.

[0016] In combination with the first aspect, in certain implementations of the first aspect, the carrier of the source cell includes a first SUL carrier and a first uplink carrier; before receiving the DAPS switching message, the method also includes: receiving configuration information from the source cell, the configuration information being used to release one of the first SUL carrier and the first uplink carrier.

[0017] In combination with the first aspect, in certain implementations of the first aspect, after accessing the target cell, the method also includes: receiving second information from the target cell, the second information being used to indicate a third carrier of the target cell; and sending an uplink signal on one of all carriers indicated by the target cell information and the second information.

[0018] In combination with the first aspect, in some implementations of the first aspect, before receiving the first information, the method also includes: sending a first capability message to the source cell, the first capability message including indication information for indicating that the SUL scenario supports DAPS switching.

[0019] In a second aspect, a communication method is provided, including: sending a first capability message to a source cell, the first capability message including indication information for indicating that an auxiliary uplink SUL scenario supports DAPS switching; receiving first information from the source cell, the first information being used to indicate a carrier of the source cell, the carrier of the source cell including a first auxiliary uplink SUL carrier and at least one of a first uplink carrier, wherein the first SUL carrier and the first uplink carrier share a cell identifier of the source cell; receiving a dual activation protocol stack DAPS switching message from the source cell, the DAPS switching 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 a cell identifier of the target cell.

[0020] In the above technical solution, the terminal device reports to the source base station whether the UE supports DAPS switching in the SUL scenario, so that the terminal device receiving, sending channels and baseband processing resources can be used to reduce the interruption time introduced by the switching.

[0021] In combination with the second aspect, in certain 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 switching message, the method also includes: receiving configuration information from the source cell, the configuration information being used to release one of the first SUL carrier and the first uplink carrier.

[0022] In combination with the second aspect, in certain implementations of the second aspect, the carrier of the source cell includes a first SUL carrier and a first uplink carrier; the method also includes: sending an uplink signal on a carrier of the source cell, and initiating a random access process on a carrier of the target cell.

[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, and sending an uplink signal on one carrier of the source cell includes:

[0024] An uplink signal is sent only on a carrier configured with a physical uplink control channel PUCCH, wherein the carrier configured with the PUCCH is a first SUL carrier or a first uplink carrier.

[0025] 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, and sending an uplink signal on a carrier of the source cell includes: sending an uplink signal only on the first SUL carrier.

[0026] In the above technical solution, the terminal device uses the SUL carrier to communicate with the source cell, which can improve data throughput and cell edge coverage.

[0027] In combination with the second aspect, in certain implementations of the second aspect, first downlink control information DCI is received from a source cell, and the first DCI is parsed based on expectations of the first SUL carrier and the first uplink carrier.

[0028] In combination with the second aspect, in certain 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 also includes: sending an uplink signal only on a carrier configured with a physical uplink control channel PUCCH, wherein the carrier configured with PUCCH is a second SUL carrier or a second 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, and after accessing the target cell, the method further includes: sending an uplink signal only on the second SUL carrier.

[0030] In the above technical solution, the terminal device uses the SUL carrier to communicate with the target cell, which can improve data throughput and cell edge coverage.

[0031] In combination with the second aspect, in some implementations of the second aspect, second downlink control information DCI is received from the target cell, and the second DCI is parsed based on expectations of the second SUL carrier and the second uplink carrier.

[0032] In combination with the second aspect, in certain implementations of the second aspect, after accessing the target cell, the method also includes: receiving second information from the target cell, the second information being used to indicate a third carrier of the target cell; and sending an uplink signal on one of all carriers indicated by the target cell information and the second information.

[0033] 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 auxiliary uplink SUL carrier and a first uplink carrier, wherein the first SUL carrier and the first uplink carrier share a cell identifier of the source cell; receiving a dual activation protocol stack DAPS switching message from the source cell, the DAPS switching 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 a 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 process on one carrier of the target cell.

[0034] In the above technical solution, the terminal device can reduce the release of carriers by judging whether multiple carrier frequencies are the same or similar, thereby improving data throughput and coverage at the cell edge.

[0035] In combination with the third aspect, in certain implementations of the third aspect, when at least one carrier of the source cell and at least one carrier of the target cell belong to the same frequency point or the same frequency band, an uplink signal is sent on one or two carriers of the source cell, including: when the first information includes a first SUL carrier and a first NUL carrier, the target cell information includes a second SUL carrier, and the second SUL carrier has the same frequency point as the first SUL carrier or belongs to the same frequency band, the communication device sends an uplink signal on the first SUL carrier and the first NUL carrier.

[0036] In combination with the third aspect, in certain implementations of the third aspect, when at least one carrier of the source cell and at least one carrier of the target cell belong to the same frequency point or the same frequency band, an uplink signal is sent on one or two carriers of the source cell, including: when the first information indicates a first SUL carrier and a first NUL carrier, the target cell information includes a second NUL carrier, and the second NUL carrier has the same frequency point as the first NUL carrier or belongs to the same frequency band, 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 certain implementations of the third aspect, after accessing the target cell, the method also 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.

[0038] In combination with the third aspect, in certain implementations of the third aspect, when at least one carrier of the source cell and at least one carrier of the target cell belong to the same frequency point or the same frequency band, an uplink signal is sent on one or two carriers of the target cell, including: when the carrier of the target cell 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 communication device sends an uplink signal on the second SUL carrier, the second NUL carrier and the first SUL carrier.

[0039] In combination with the third aspect, in certain implementations of the third aspect, when at least one carrier of the source cell and at least one carrier of the target cell belong to the same frequency point or the same frequency band, an uplink signal is sent on one or two carriers of the target cell, including: 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 communication device sends an uplink signal on the second SUL carrier, the second NUL carrier and the first NUL carrier.

[0040] In combination with the third aspect, in certain implementations of the third aspect, second downlink control information DCI is received from the target cell, and the second DCI is parsed based on expectations of the second SUL carrier and the second uplink carrier.

[0041] In combination with the third aspect, in certain implementations of the third aspect, before receiving the first information, the method further includes: sending a first capability message to the source cell, the first capability message including indication information for indicating that the SUL scenario supports DAPS switching.

[0042] In a fourth aspect, a communication method is provided, 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 dual activation protocol stack DAPS switching message from the source cell, the DAPS switching message including target cell information, the target cell information being used to indicate one or more carriers of the target cell; when a carrier of the source cell and a 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 process on a carrier of the target cell.

[0043] In the above technical solution, the terminal device can reduce the release of carriers by judging whether multiple carrier frequencies are the same or similar, thereby improving data throughput and coverage at the cell edge.

[0044] In combination with the fourth aspect, in certain implementations of the fourth aspect, the carrier of the target cell includes multiple carriers. After accessing the target cell, the method also 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.

[0045] In a fifth aspect, a communication method is provided, comprising: 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 auxiliary uplink SUL carrier and at least one of a first uplink carrier, wherein the first SUL carrier and the first uplink carrier share a cell identifier of the source cell; receiving a dual activation protocol stack DAPS switching message from the source cell, the DAPS switching 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; and sending uplink signals respectively between the carrier of the source cell and the carrier of the target cell in a time division multiplexing manner based on a first time interval.

[0046] In the above technical solution, in the SUL scenario, by implementing TDM switching with GAP, the DAPS switching function can also be implemented on a low-end UE that only supports one carrier.

[0047] In combination with the fifth aspect, in certain implementations of the fifth aspect, before receiving the DAPS switching message, the method further includes: sending second capability information to the source cell, where the second capability information is used to indicate the first time interval.

[0048] In combination with the fifth aspect, in certain implementations of the fifth aspect, before receiving the first information, the method also includes: sending a first capability message to the source cell, the first capability message including indication information for indicating that the SUL scenario supports DAPS switching.

[0049] In a sixth aspect, a communication method is provided, comprising: receiving first information from a source cell, the first information being used to indicate one or more carriers of the source cell; receiving a dual activation protocol stack DAPS switching message from the source cell, the DAPS switching message including target cell information, the target cell information being used to indicate one or more carriers of the target cell; and sending uplink signals respectively between the carrier of the source cell and the carrier of the target cell in a time division multiplexing manner based on a first time interval.

[0050] In the above technical solution, in a multi-carrier scenario, by implementing TDM switching with GAP, the DAPS switching function can also be implemented on a low-end UE that only supports one carrier.

[0051] In combination with the sixth aspect, in certain implementations of the sixth aspect, before receiving the DAPS switching message, the method further includes: sending second capability information to the source cell, where the second capability information is used to indicate the first time interval.

[0052] In a seventh aspect, the present application provides a communication device, which has the function of implementing the method in any possible implementation of the first to sixth aspects and the first to sixth aspects. The function can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

[0053] In an eighth aspect, the present application provides a communication device, comprising at least one processor, the at least one processor being coupled to at least one memory, the at least one memory being used to store computer programs or instructions, and the at least one processor being used to call and run the computer program or instructions from the at least one memory, so that the communication device executes the method in any possible implementation of the first to sixth aspects and the first to sixth aspects.

[0054] In one example, the communication device may be a terminal device.

[0055] In a ninth aspect, a processor is provided, comprising: 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 a signal through the output circuit, so that the method in any aspect of the first to sixth aspects and any possible implementation manner of the first to sixth aspects is implemented.

[0056] In the specific implementation process, the processor can be a chip, the input circuit can be an input pin, the output circuit can be an output pin, and the processing circuit can be a transistor, a gate circuit, a trigger, and various logic circuits. The input signal received by the input circuit can be, for example, but not limited to, received and input by a receiver, and the signal output by the output circuit can be, for example, but not limited to, output to a transmitter and transmitted by the transmitter, and the input circuit and the output circuit can be the same circuit, which is used as an input circuit and an output circuit at different times. The embodiments of the present application do not limit the specific implementation methods of the processor and various circuits.

[0057] In a tenth aspect, the present application provides a computer-readable storage medium, in which computer instructions are stored. When the computer instructions are executed on a computer, the method in any possible implementation of aspects 1 to 6 and aspects 1 to 6 is executed.

[0058] In an eleventh aspect, the present application provides a computer program product, comprising a computer program code, which, when executed on a computer, enables the method in any possible implementation of aspects 1 to 6 and aspects 1 to 6 to be executed.

[0059] In the twelfth aspect, the present application provides a chip comprising a processor and a communication interface, wherein 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 method in any possible implementation of aspects 1 to 6 and aspects 1 to 6 is executed.

[0060] In a thirteenth aspect, the present application provides a communication system, comprising a communication device as described in the eighth aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 It is a schematic diagram of an application scenario of an embodiment of the present application.

[0062] Figure 2 It is a schematic flow chart of a communication method proposed in this application.

[0063] Figure 3 It is a schematic flow chart of another communication method proposed in this application.

[0064] Figure 4 A schematic block diagram of a communication device 1000 provided in the present application.

[0065] Figure 5 A schematic structural diagram of the communication device 10 provided in this application. DETAILED DESCRIPTION

[0066] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0067] 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 fifth generation (5G) system or new radio (NR), vehicle-to-X V2X, where V2X can include vehicle to network (V2N), vehicle to vehicle (V2V), vehicle to infrastructure (V2I). infrastructure (V2I), vehicle to pedestrian (V2P), 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.

[0068] Figure 1 FIG. 1 is a schematic diagram of a network architecture provided by an embodiment of the present application. Figure 1As shown, the communication system of the embodiment of the present application may include a network device and multiple terminal devices. The network device may include one antenna or multiple antennas. In addition, the network device may additionally include a transmitter chain and a receiver chain, and those skilled in the art will understand that they may include multiple components related to signal transmission and reception (such as processors, modulators, multiplexers, demodulators, demultiplexers or antennas, etc.).

[0069] The network device can communicate with multiple terminal devices. The terminal device in the embodiment of the present application can also be called: user equipment (UE), mobile station (MS), mobile terminal (MT), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device, etc.

[0070] The terminal device may be a device that provides voice / data connectivity to users, such as a handheld device or vehicle-mounted device with wireless connection function. At present, some examples of terminal devices are: mobile phones, tablet computers, laptop computers, PDAs, mobile internet devices (MID), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless communication functions, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, terminal devices in 5G networks or future evolved public land mobile communication networks (public land mobile The present invention relates to a terminal device in a wireless communication system (PLMN) and / or any other suitable device for communicating on a wireless communication system, which is not limited in the embodiments of the present application.

[0071] Among them, wearable devices can also be called wearable smart devices, which are a general term for the intelligent design and development of wearable devices for daily wear using wearable technology, such as glasses, gloves, watches, clothing and shoes. Wearable devices are portable devices that are worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also realize powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include full-featured, large-sized, and independent of smartphones to achieve complete or partial functions, such as smart watches or smart glasses, as well as those that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various smart bracelets and smart jewelry for vital sign monitoring.

[0072] In addition, in the present embodiment, the terminal device can 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 objects to the network through communication technology, thereby realizing an intelligent network that interconnects people and machines and things.

[0073] In addition, in the embodiments of the present application, the terminal device may also include sensors such as smart printers, train detectors, gas stations, etc., and its main functions include collecting data (partial terminal devices), receiving control information and downlink data from network devices, and sending electromagnetic waves to transmit uplink data to network devices.

[0074] The network device in the embodiment 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 base station B (nodeB, NB) in a wideband code division multiple access (WCDMA) system, or an evolved nodeB (eNB or eNodeB) in an LTE system, or a wireless controller in a cloud radio access network (CRAN) scenario, or a radio network controller (RNC), a base station controller (BSC), a home base station (for example, home evolved nodeB, or home nodeB, HNB), a baseband unit (BBU), or the network device may be a relay station, an access point, an in-vehicle device, a wearable device, a network device in a future 5G network, or a network device in a future evolved PLMN network, etc., or an access point (access point) in a WLAN The invention relates to a wireless access point (AP), a wireless relay node, a wireless backhaul node, a transmission point (TP) or a transmission and reception point (TRP), etc. It can be a gNB or a transmission point (TRP or TP) in a new radio system (NR), or one or a group of antenna panels (including multiple antenna panels) of a base station in a 5G system, or a network node constituting a gNB or a transmission point, such as a baseband unit (BBU), or a distributed unit (DU), etc., which is not limited in the embodiments of the present application.

[0075] 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, and implementing the functions of the radio resource control (RRC) and packet data convergence protocol (PDCP) layers. The DU is responsible for processing physical layer protocols and real-time services, and 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 active antennas. Since the information of the RRC layer will eventually become the information of the PHY layer, or be converted from the information of the PHY layer, therefore, under this architecture, high-level 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 can be a device including one or more of a CU node, a DU node, and an AAU node. In addition, the CU may be divided into a network device in an access network (radio access network, RAN), or the CU may be divided into a network device in a core network (core network, CN), and this application does not limit this.

[0076] In addition, in an embodiment of the present application, the network device provides services for the cell, and the terminal device communicates with the cell through the transmission resources (for example, frequency domain resources, or spectrum resources) allocated by the network device. The cell may belong to a macro base station (for example, a macro eNB or a macro gNB, etc.), or may belong to a base station corresponding to a small cell. The small cell here may include: metro cell, micro cell, pico cell, femto cell, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.

[0077] In addition, in an embodiment of the present application, the network device may include a base station (gNB), such as a macro base station, a micro base station, an indoor hotspot, and a relay node, etc., whose function is to send radio waves to the terminal device to realize downlink data transmission on the one hand, and to send scheduling information to control uplink transmission on the other hand, and to receive the radio waves sent by the terminal device and receive uplink data transmission.

[0078] The following is a brief introduction to the terms involved in this application.

[0079] 1. DAPS switching (also known as 0ms switching) is essentially a soft switching: when switching occurs, the UE needs to disconnect the air interface signal with the source cell only after successfully completing the random access of the target cell, including signaling connection and data; during the switching process, the UE simultaneously receives and sends signals from the source cell and the target cell to achieve uninterrupted service. An ordinary hard switching is that the UE immediately disconnects the signal from the source cell when the switching occurs. Compared with hard switching, DAPS switching can reduce the interruption time introduced by the switching, making the interruption time close to or equal to 0ms, and improve the reliability of the switching, providing the UE with a seamless switching communication experience.

[0080] 2. SUL: As an auxiliary spectrum, SUL can improve the uplink signal coverage of UE at the cell boundary and the throughput in the cell center. Specifically, in the cell center, SUL and NR UL schedule UE to send uplink through TDM. For example, SUL and NR UL support TDM switching of SUL 1T / NUL 1T 0us, or SUL 1T / NUL 2T 35.7us~140us, or SUL 2T / NUL 2T35.7us~140us, etc. Compared with the scenario with only one NR UL uplink carrier, this method has an additional uplink carrier spectrum, and NR UL is a TDD standard. SUL supports uplink transmission in all time slots. SUL can send signals in the time slots where NR UL is downlink, thus bringing gains in improving uplink throughput. At the cell edge, terminal equipment uses SUL to improve uplink coverage. According to simulation and empirical data, the low frequency uplink coverage of the SUL carrier is better than that of the NR UL. Therefore, using the SUL carrier instead of the NR UL carrier to send uplink at the cell edge can enhance the uplink signal coverage.

[0081] Regarding DAPS switching, the 3GPP standard currently has the following provisions. However, the following provisions do not involve the frequency band combination of SUL.

[0082] (1) If dual connectivity (DC) exists, then before DAPS switching, there is air interface signaling to notify the UE to release the SCG.

[0083] (2) The handover command may include DAPS handover indication, cell-level configuration and UE-level configuration. The cell-level configuration includes cell ID, frequency, bandwidth, physical random-access channel (PRACH), physical uplink control channel (PUCCH) common configuration, physical uplink share channel (PUSCH) common configuration, etc.;

[0084] UE-level configuration, including sounding reference signal (SRS), PUSCH dedicated configuration, PUCCH dedicated configuration, etc.

[0085] (3) The UE receives a DAPS handover command. If there is CA in the original cell, the UE releases the SCELL on its own.

[0086] (4) During the DAPS handover process, there are only two cells, the original cell and the target cell, with uplink transmission and downlink reception.

[0087] (5) The UE receives the DAPS handover command and performs cell search, synchronization and RA in the target cell. After the RA is successful, the configuration parameters of the target cell are allowed to be modified through RRC reconfiguration signaling.

[0088] (6) After the target cell RA succeeds, the UE receives an air interface signaling notification from the target cell to release the source cell, and the UE performs the process of releasing the source cell.

[0089] (7) Regarding UE capabilities: If DAPS switching is supported, the UE can report to the base station through the frequency band combination capability 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 switching is supported under the frequency band combination of CA or DC, the UE can report to the base station through bandcombination and featureSetCombinationDAPS.

[0090] In 3GPP R15 and 16, the SUL frequency band combinations under standalone (SA) and non-standalone (NSA) are defined, including the following configuration parameters, UE capabilities and processing:

[0091] (1) The SUL and NR UL support concurrency through the UE capability indication, that is, whether the SRS supports concurrency with the PUCCH, PUSCH, and SRS of another carrier; otherwise, time division switching is used by default.

[0092] (2) SA SUL 1T and NR UL 1T TDM switching, switching time 0us. 0us is specified by the standard.

[0093] (3) Under NSA, if the channel bandwidth and frequency of the LTE carrier and the SUL carrier are the same, then the SUL 1T and NR UL 1T TDM switch, the switching time is 0us; otherwise, the SUL 1T and NR UL 1T TDM switch, the switching time is 140us. Both 0us and 140us are specified by the standard.

[0094] (4) UL TDM switching under SA SUL band combination supports up to 2 uplinks to be sent simultaneously. The scenarios include the following: carrier 1 is SUL and carrier 2 is NR UL.

[0095] Scenario 1: 1 Tx on carrier 1 and 1 Tx on carrier 2 (i.e. 1T+1T);

[0096] Scenario 2: 0 Tx on carrier 1 and 2 Tx on carrier 2 (i.e. 0T+2T).

[0097] (5) SUL cell-level configuration is possible only when NUL cell-level configuration exists.

[0098] (6) RA can be performed in SUL or NUL, and the entire RA process must be completed on a selected single carrier.

[0099] ① The base station can specify any carrier to perform random access, which can be reconfigured through PDCCH order or RRC.

[0100] ② If the base station does not specify and the cell-level configuration includes two carriers, the UE selects which carrier to perform RA on based on the signal quality. The common configuration includes the threshold rsrp-ThresholdSSB-SUL. Only when the reference signal received power (RSRP) value measured by the UE on the downlink carrier is less than the threshold, the UE selects the SUL carrier for access.

[0101] Among them, regarding UL TDM switching under SA SUL frequency band combination, up to 2T is supported, as follows:

[0102] (1) The TDM switching GAP length is {35us, 140us, 210us{.

[0103] (2) TDM switching is reported to the base station through UE capabilities, and the capability candidate values ​​are {option 1, option 2, both option 1 and option 2}.

[0104] Option 1 means that if the base station is configured with UL TDM, the base station cannot schedule carrier 2 in Case 1, that is, carrier 1 and carrier 2 can only use TDM and cannot be concurrent, see Table 1.

[0105] Table 1

[0106]

[0107] Option 2 means that if the base station is configured with UL TDM, the base station can be scheduled on carrier 1 or carrier 2 alone; it can also be scheduled on carrier 1 and carrier 2 at the same time, that is, it supports the concurrency of carrier 1 and carrier 2, see Table 2.

[0108] Table 2

[0109]

[0110] (3) In UL TDM, RRC specifies which carrier the switching GAP is located on. In SA SUL scenarios, the GAP can be located on the NR UL carrier or the SUL carrier, which is specified by uplinkTxSwitchingCarrier.

[0111] (4) The base station specifies the carrier that can be dynamically switched through the RRC uplinkTxSwitchingCarrier. This carrier can send a maximum of 2T. Dynamic switching is allowed only once in a single time slot.

[0112] (5) In 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 structures, such as coupling between UL and downlink (DL), UL TDM switching will also introduce interruption to downlink reception.

[0113] (6) During UL TDM, no additional TDM pattern is introduced for the SA SUL band combination.

[0114] (7) In UL TDM, the transmission of PRACH preamble, UE CSI computation time, SRS, and PUSCH preparation procedure time will introduce processing time relaxation due to GAP switching.

[0115] Since the existing standards have not yet specified the DAPS switching process related to the UE in the SUL scenario, the present application provides a switching method under the SUL frequency band combination, which can reduce the time interruption introduced by the switching in this scenario and improve the success rate of the switching.

[0116] See also Figure 2 , Figure 2 It is a schematic flow chart of a communication method proposed in this application.

[0117] S201, a terminal device (ie, an example of a communication apparatus) receives first information from a source cell.

[0118] 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 auxiliary uplink SUL carrier and a first uplink carrier, wherein the first SUL carrier and the first uplink carrier share a cell identifier of the source cell. As an example, in this embodiment, the first uplink carrier is taken as a first NRUL carrier (hereinafter referred to as the first NUL carrier) for illustration.

[0119] 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 and can be used to communicate with the source cell.

[0120] Optionally, the first information also includes source cell information (ie, resources of the source cell). The source cell information will be described in S203 and will not be described here in detail.

[0121] S202: The terminal device sends an uplink signal on a carrier indicated by the first information.

[0122] Specifically, when the first message in S201 indicates only one uplink carrier, the terminal device sends an uplink signal on the carrier. When the first message indicates two uplink carriers, the first SUL carrier and the first NUL carrier, the terminal device needs to select one carrier from the two uplink carriers to send an uplink signal. This can also be understood as the terminal device selecting one carrier from the two uplink carriers to maintain wireless communication with the source cell.

[0123] Specifically, the cell information of the source cell includes cell-level (cell specific) configuration and UE-level (UE specific) configuration. Among them, the cell-level configuration parameters include cell ID, frequency, bandwidth, PRACH channel, PUCCH channel common configuration, PUSCH channel common configuration, etc.; UE-level configuration parameters include RS, PUSCH channel dedicated configuration (PUSCH dedicated configuration), PUCCH channel dedicated configuration (PUCCH dedicated configuration), SRS is a type of RS.

[0124] Optionally, if two uplink carriers are configured, the terminal device uses the carrier configured with PUCCH in the first SUL carrier and the first NUL carrier to send an uplink signal. The carrier configured with PUCCH may be a carrier configured with a dedicated configuration of a PUCCH channel.

[0125] Optionally, the terminal device chooses to fall back to the first SUL carrier to send an uplink signal.

[0126] Optionally, if two uplink carriers are configured, the terminal device may also receive configuration information from the source cell, where 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.

[0127] It should be noted that the terminal receives the first downlink control information (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 is configured with two carriers, the NUL / SUL indicator field in the first DCI is x bits. If the source cell is configured with one carrier, the NUL / SUL indicator field in the first DCI is y bits. For example: the source cell is configured with two carriers. In S302, even if the subsequent UE sends an uplink signal in the source cell and only uses one of the carriers, the terminal device still needs to parse the NUL / SUL indicator field in the DCI based on x bits. In short, it is necessary to parse the bits corresponding to the received first DCI according to the actual number of carriers configured in the source cell.

[0128] Optionally, when the carrier where the uplink signal is located includes a sounding reference signal (SRS), the terminal device sends the SRS to the source cell; otherwise, when the carrier where the first uplink signal is located does not include the SRS, the terminal device does not send the SRS.

[0129] S203, the terminal device receives a DAPS switching message from the source cell.

[0130] The DAPS switching message includes target cell information, where the target cell information is used to indicate a carrier of the target cell, where 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 a cell identifier of the target cell. As an example, in this embodiment, the second uplink carrier is taken as a second NRUL carrier (hereinafter referred to as the second NUL carrier) for illustration.

[0131] It should be understood that the second SUL and the second NUL are uplink carriers through which the target cell configured by the source cell for the terminal device can communicate with the terminal device.

[0132] 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 through handover and when a secondary cell (scell) is added.

[0133] Optionally, if the target cell ID and the source cell ID are different, the DAPS switching message must include the cell-level configuration; 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.

[0134] S204: The terminal device initiates a random access procedure in a carrier indicated by the target cell information.

[0135] Specifically, when the target cell information in S203 indicates only one uplink carrier, the terminal device initiates random access on the carrier. When the target cell information indicates two uplink carriers, the second SUL carrier and the second NUL carrier, the terminal device selects one carrier from the two uplink carriers for random access (RA). This application does not specifically limit which of the two carriers is used for random access.

[0136] Optionally, the base station selects a carrier to designate a terminal device for random access based on a reference signal received power (RSRP) and / or a reference signal received quality (RSRQ) measurement result report reported by the terminal device, or the SRS sent.

[0137] Optionally, if two uplink carriers are configured, the terminal device selects a carrier to access through an RSRP threshold. Only when the RSRP measured by the terminal device is less than the threshold, the terminal device selects the second SUL carrier for access.

[0138] It should be understood that the terminal device always performs random access on one carrier, including the uplink carrier of the hybrid automatic repeat request (HARQ) acknowledgment (ACK) feedback.

[0139] Optionally, the random access may be of contention or non-contention type, which is not specifically limited in the present application.

[0140] Optionally, the source cell may configure a DAPS switching command in information elements (IE) such as ReconfigurationWithSync and RadioBearerConfig of RRCReconfiguration.

[0141] Optionally, parameters of random access (RA) of the target cell may be included in the cell-level configuration.

[0142] Optionally, the carrier allowed to be reconfigured is different from the carrier of the target cell RA. For example, the target cell carrier includes two carriers, the second NUL and the second SUL, and the RA is accessed on the second NUL, and can be subsequently modified through RRC reconfiguration to send uplink signals on the second SUL carrier.

[0143] 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 carrier from the two uplink carriers to send an uplink signal.

[0144] Optionally, if two uplink carriers are configured, the terminal device sends an uplink signal on a carrier configured with PUCCH in the second SUL carrier and the second NUL carrier.

[0145] Optionally, if two uplink carriers are configured, the terminal device chooses to fall back to the second SUL carrier to send an uplink signal.

[0146] 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 (bits); if the target cell is configured with one carrier, the UL / SUL indication field in the second DCI is y bits. For example: if the target cell is configured with two carriers, even if the subsequent target cell and UE only use one of the carriers to send uplink signals, the terminal device still needs to parse the UL / SUL indicator field in the DCI based on x bits. In short, it is necessary to parse the bits corresponding to the received second DCI according to the actual number of carriers configured in the target cell.

[0147] 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 switching message in S203 and the carrier determined in S204, and this application will not elaborate on this.

[0148] Optionally, after the terminal device successfully randomly accesses the target cell, the method further includes: S205, the terminal device receives second information from the target cell. The second information includes configuration information of the second SUL carrier and / or the second NUL carrier (ie, an example of the third carrier).

[0149] It should be understood that in the present application, the source cell and the target cell have uplink transmission at the same time when the DAPS is switched.

[0150] Optionally, if the target cell information required by the terminal device is configured in the DAPS switching message in S202, then in this step, the second information may not need to configure the target cell information for the terminal device.

[0151] Optionally, if part of the target cell information required by the terminal device is configured in the DAPS switching message in S202, the target cell may configure all or part of the required target cell information for the terminal device in the second information, and this application does not make specific limitations on this.

[0152] S206: The terminal device sends an uplink signal to the target cell on one of all carriers indicated by the target cell information and the second information.

[0153] 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 uses the carrier configured with PUCCH in the second NUL carrier and the second SUL carrier to send an uplink signal; or, the terminal device uses the second SUL carrier to send an uplink signal.

[0154] 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, the terminal device uses the second SUL carrier to send an uplink signal to the target cell.

[0155] 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 given priority.

[0156] 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 that the SUL scenario supports DAPS switching.

[0157] The first capability message includes bandcombination and feature set combination. BandCombination refers to the frequency band combination of NR carrier aggregation (CA), NR non-CA and / or multi-Radio dual connectivity (MR-DC), and FeatureSetCombination refers to the feature set combination supported by the UE.

[0158] Existing standard definitions: ①BandCombination and FeatureSetCombination are associated in CA, dual connectivity (DC) or single carrier. ②FeatureSetCombinationDAPS (FSC-DAPS) is newly defined for DAPS. If the UE supports DAPS in CA or DC, the bandcombination of CA or DC is associated with FSC-DAPS. The base station can determine whether the UE supports DAPS switching through the two pieces of information, bandcombination+FSC-DAPS.

[0159] However, the current standard does not support DAPS switching under SUL frequency band combination, and SUL bandcombination has at most one SUL band, which does not meet the scenario where the source and target cells are configured with SUL carriers at the same time and belong to different frequency bands. Therefore, in this application, SUL bandcombination is associated with FSC-DAPS, or a new SULbandcombination-DAPS frequency band combination is added to determine whether the UE supports DAPS switching.

[0160] Optionally, before the terminal device reports the first capability message, the method also includes: the terminal device receives a capability negotiation message sent from a source cell, the capability negotiation message is used to instruct the terminal device to report the first capability message, and then the terminal device reports the first capability message to the source cell according to the capability negotiation message.

[0161] Optionally, the frequency band combination consisting of the source cell and the target cell supporting DAPS switching under SUL reports the source cell through the first capability message. The source cell and the target cell belong to the frequency band combination supporting SUL, and the source cell and the target cell are subsets of the frequency band combination supporting SUL.

[0162] Optionally, the terminal device reports the frequency band combination supporting SUL to the source cell through the first capability message. The frequency band combination of SUL includes not only the source cell and the target cell of DAPS switching, but also the scell of UL CA or DL ​​CA.

[0163] Optionally, the uplink of the source cell and the target cell can be time-division switching with TDM GAP, and the GAP time length is optional. For example: if the terminal device has 2T capability (RF capability) and corresponding baseband processing resources (mainly the number of carriers of the source cell and the target cell), then it supports source cell SUL 1T + target cell SUL 1T concurrency; source cell SUL 1T + target cell NUL 1T concurrency; source cell NUL 1T + target cell NUL 1T concurrency; source cell NUL 1T + target cell SUL 1T concurrency; source cell SUL 1T + target cell SUL 1T TDM 0us TDM; source cell NUL 2T and target cell SUL 1T TDM 35.7usTDM; source cell NUL 2T and target cell SUL 2T TDM 35.7~140us TDM, etc.

[0164] Optionally, before accessing the source cell, the terminal device may reside in other cells, and the other cells store the first capability message of the terminal device. In this case, the source cell may also obtain the first capability message from the other cells where the terminal device previously resided. This application does not specifically limit the acquisition of the first capability message.

[0165] It should be understood that the implementation time of S207 is not specifically limited herein, and S207 may also be completed before S203 (ie, before receiving the DAPS switching message).

[0166] 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.

[0167] This embodiment provides a basic process for implementing DAPS switching in a SUL scenario. When there are multiple uplink carriers between the source cell or the target cell and the terminal device, one of the carriers is selected to communicate with the source cell and the target cell respectively. This method makes full use of the terminal device's sending channel and baseband processing resources, reduces the interruption time introduced by the switching, and improves data throughput and cell edge coverage.

[0168] Next, this application provides another communication method, Figure 2The difference between the corresponding embodiments 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 not release carriers with the same or similar frequencies, thereby making full use of the channel resources of the SUL carrier and improving the throughput of uplink data.

[0169] See also Figure 3 , Figure 3 It is a schematic flow chart of another communication method proposed in this application.

[0170] S301 and S302 Figure 2 The processes of S201 and S203 are the same, please refer to the descriptions of S201 and S203 for details, which will not be repeated here.

[0171] S303: When at least one carrier of the source cell and at least one carrier of the target cell belong to the same frequency point or the same frequency band, an uplink signal is sent on one or two carriers of the source cell, and a random access process is initiated on one carrier of the target cell.

[0172] 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 that of the first SUL carrier or belongs to the same frequency band, and the frequency of the first NUL carrier is the same as that of the second NUL carrier or belongs to the same frequency band, the terminal device sends an uplink signal on the first SUL carrier and the first NUL carrier, and initiates a random access process in one of the second SUL carrier and the second NUL carrier.

[0173] 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 second SUL carrier has the same frequency as the first SUL carrier or belongs to the same frequency band, the terminal device sends an uplink signal on the first SUL carrier and the first NUL carrier, and initiates a random access process on the second SUL carrier.

[0174] Optionally, when the first information indicates a first SUL carrier and a first NUL carrier, the target cell information includes a second NUL carrier, and the second NUL carrier has the same frequency as the first NUL carrier or belongs to the same frequency band, the terminal device sends an uplink signal on the first SUL carrier and the first NUL carrier, and initiates a random access process on the second NUL carrier.

[0175] Optionally, when the information of the target cell 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 as the first SUL carrier or belongs to the same frequency band, the terminal device sends an uplink signal on the first SUL carrier and initiates a random access process in one of the second SUL carrier and the second NUL carrier.

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

[0177] Optionally, S304, after the terminal device successfully randomly accesses the target cell, when the target cell information includes a second SUL carrier and a second NUL carrier, when at least one carrier of the source cell and at least one carrier of the target cell belong to the same frequency point or the same frequency band, an uplink signal is sent on one or two carriers of the target cell.

[0178] 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 (ie, an example of the third carrier).

[0179] 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 sends an uplink signal on one or two carriers of the target cell.

[0180] 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, an uplink signal is sent on one or two carriers of the target cell.

[0181] Optionally, when the target cell and the target cell carrier configured in 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 frequency of the first SUL carrier is the same as that of the second SUL carrier or belongs to the same frequency band, and the frequency of the first NUL carrier is the same as that of the second NUL carrier or belongs to the same frequency band, the terminal device sends an uplink signal on the first SUL carrier, the first NUL carrier, the second SUL carrier and the second NUL carrier.

[0182] 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 as the first SUL carrier or belongs to the same frequency band, the terminal device sends an uplink signal on the second SUL carrier, the second NUL carrier and the first SUL carrier.

[0183] Optionally, when the target cell and the target cell carrier configured in the second information include 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 as the first NUL carrier or belongs to the same frequency band, the terminal device sends an uplink signal on the second SUL carrier, the second NUL carrier and the first NUL carrier.

[0184] Here we only give a few possible situations. Similarly, the above judgment can also be made in other situations. We will not give examples of all the situations here.

[0185] S307 to S308 and Figure 2 The processes from S207 to S208 are basically the same, please refer to the descriptions from S207 to S208 for details, which will not be repeated here.

[0186] In this embodiment, the terminal device can reduce the release of carriers by judging whether the carrier frequencies are the same or close, thereby improving data throughput and coverage at the cell edge.

[0187] It should be understood that this embodiment is specific to how to determine an uplink carrier in a SUL scenario, and the present application also proposes another communication method that can cover a multi-carrier scenario.

[0188] The method includes: a terminal device receives first information from a source cell, the first information is used to indicate one or more carriers of the source cell; the terminal device receives a dual activation protocol stack DAPS switching message from the source cell, the DAPS switching message includes target cell information, and the target cell information is used to indicate one or more carriers of the target cell; when a carrier of the source cell and a carrier of the target cell belong to the same frequency point or the same frequency band, the terminal device sends an uplink signal on one or two carriers of the source cell, and initiates a random access process on a carrier of the target cell.

[0189] In addition, the existing DAPS switching has not yet defined the switching interruption time of the source cell and the target cell uplink TDM transmission or downlink TDM reception. Most UEs have a limited number of uplink channel resources, for example, only 2T, and low-end UEs even have only 1T. If TDM switching with GAP is not defined, the support of DAPS switching function on low-end UEs will be limited.

[0190] Therefore, the present application also proposes another communication method that supports uplink time division transmission. There is a GAP in the switching between carriers. The terminal device sends uplink data on the carriers of the source cell and the target cell through time division multiplexing. Then the terminal device may not release the carrier of the source cell, thereby improving resource utilization and system data throughput.

[0191] The terminal device receives first information from a source cell, where the first information is used to indicate a carrier of the source cell, where the carrier of the source cell includes at least one of a first auxiliary uplink SUL carrier and a first uplink carrier, wherein the first SUL carrier and the first uplink carrier share a cell identifier of the source cell; receives a dual activation protocol stack DAPS switching message from the source cell, where the DAPS switching message includes target cell information, where the target cell information is used to indicate a carrier of the target cell, where 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 a cell identifier of the target cell; and sends uplink signals respectively between the carrier of the source cell and the carrier of the target cell in a time division multiplexing manner based on a first time interval.

[0192] Optionally, before receiving the DAPS switching message, the terminal device sends second capability information to the source cell, where the second capability information is also used to indicate the first time interval.

[0193] It should be understood that the above embodiment of sending uplink data on the carriers of the source cell and the target cell by time division multiplexing is specific to how to use the uplink carrier in the SUL scenario. The present application also proposes another communication method that can cover multi-carrier scenarios.

[0194] The method includes: receiving first information from a source cell, the first information being used to indicate one or more carriers of the source cell; receiving a dual activation protocol stack DAPS switching message from the source cell, the DAPS switching message including target cell information, the target cell information being used to indicate one or more carriers of the target cell; and sending uplink signals respectively between the carrier of the source cell and the carrier of the target cell in a time division multiplexing manner based on a first time interval.

[0195] Optionally, before receiving the DAPS switching message, the terminal device sends second capability information to the source cell, where the second capability information is also used to indicate the first time interval.

[0196] The communication method provided by the present application is described in detail above. The communication device provided by the present application is introduced below.

[0197] See also Figure 4 , Figure 4 1 is a schematic block diagram of a communication device 1000 provided in this application. Figure 4, the communication device 1000 includes a receiving unit 1100, a sending unit 1200 and a processing unit 1300.

[0198] The receiving unit 1100 is used to receive first information from a source cell, where the first information is used to indicate a carrier of the source cell, where the carrier of the source cell includes at least one of a first auxiliary uplink SUL carrier and a first uplink carrier, wherein the first SUL carrier and the first uplink carrier share a cell identifier of the source cell; the receiving unit 1100 is also used to receive a dual activation protocol stack DAPS switching message from the source cell, where the DAPS switching message includes target cell information, where the target cell information is used to indicate a carrier of the target cell, where 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; the sending unit 1200 is used to send an uplink signal on a carrier of the source cell, and the processing unit 1300 is used to initiate a random access process on a carrier of the target cell.

[0199] Optionally, in one embodiment, the carrier of the source cell includes the first SUL carrier and the first uplink carrier; the processing unit 1300 is used to instruct the sending unit 1200 to send an uplink signal only on a carrier configured with a physical uplink control channel PUCCH, wherein the carrier configured with PUCCH is the first SUL carrier or the first uplink carrier.

[0200] Optionally, in another embodiment, the carrier of the source cell includes the first SUL carrier and the first uplink carrier; the processing unit 1300 is used to instruct the sending unit 1200 to send uplink data only on the first SUL.

[0201] Optionally, in another embodiment, the receiving 1100 receives first downlink control information DCI from the source cell, and parses the first DCI based on expectations of the first SUL carrier and the first uplink carrier.

[0202] Optionally, in another embodiment, the carrier of the target cell includes the second SUL carrier and the second uplink carrier; the processing unit 1300 is used to instruct the sending unit 1200 to send uplink signals only on the carrier configured with the physical uplink control channel PUCCH after accessing the target cell, wherein the carrier configured with the PUCCH is the second SUL carrier or the second uplink carrier.

[0203] Optionally, in another embodiment, the carrier of the target cell includes the second SUL carrier and the second uplink carrier; after accessing the target cell, the processing unit 1300 is used to instruct the sending unit 1200 to send an uplink signal only on the second SUL carrier.

[0204] Optionally, in another embodiment, the processor is further configured to: receive, through the transceiver, second downlink control information DCI from the target cell, and parse the second DCI based on expectations of the second SUL carrier and the second uplink carrier.

[0205] Optionally, in another embodiment, the carrier of the source cell includes the first SUL carrier and the first uplink carrier; before receiving the DAPS switching message, the receiving unit 1100 is also used to receive configuration information from the source cell, and the configuration information is used to release one of the first SUL carrier and the first uplink carrier.

[0206] Optionally, in another embodiment, the carrier of the source cell includes the first SUL carrier and the first uplink carrier; the processor is also used to, through the transceiver: the receiving unit 1100 is also used to receive second information from the target cell, the second information is used to indicate a third carrier of the target cell; and send an uplink signal on one of all carriers indicated by the target cell information and the second information.

[0207] Optionally, in another embodiment, before receiving the first information, the sending unit 1200 is further used 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 switching.

[0208] In other embodiments, each unit of the communication device 1000 is further configured to perform the following steps and / or operations.

[0209] The sending unit 1200 is used to send a first capability message to a source cell, wherein the first capability message includes indication information for indicating that the auxiliary uplink SUL scenario supports DAPS switching; the receiving unit 1100 is used to receive first information from the source cell, wherein 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 auxiliary uplink SUL carrier and a first uplink carrier, wherein the first SUL carrier and the first uplink carrier share a cell identifier of the source cell; the receiving unit 1100 is also used to receive a dual activation protocol stack DAPS switching message from the source cell, wherein the DAPS switching message includes target cell information, wherein 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.

[0210] Optionally, in one embodiment, the carrier of the source cell includes the first SUL carrier and the first uplink carrier; before receiving the DAPS switching message, the method also includes: the receiving unit 1100 is also used to receive configuration information from the source cell, and the configuration information is used to release one of the first SUL carrier and the first uplink carrier.

[0211] Optionally, in another embodiment, the carrier of the source cell includes the first SUL carrier and the first uplink carrier; the method also includes: the sending unit 1200 is also used to send an uplink signal on a carrier of the source cell, and the processing unit 1300 is used to initiate a random access process on a carrier of the target cell.

[0212] Optionally, in another embodiment, the carrier of the source cell includes the first SUL carrier and the first uplink carrier, and the sending of an uplink signal on a carrier of the source cell includes: the sending unit 1200 is also used to send an uplink signal only on a carrier configured with a physical uplink control channel PUCCH, wherein the carrier configured with PUCCH is the first SUL carrier or 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, and sending an uplink signal on a carrier of the source cell includes: the sending unit 1200 is further used to send uplink data only on the first SUL carrier.

[0214] 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 expectations of the first SUL carrier and the first uplink carrier.

[0215] Optionally, in another embodiment, the carrier of the target cell includes the second SUL carrier and the second uplink carrier. After accessing the target cell, the method further includes: the sending unit 1200 is also used to send an uplink signal only on a carrier configured with a physical uplink control channel PUCCH, wherein the carrier configured with PUCCH is the second SUL carrier or the second uplink carrier.

[0216] Optionally, in another embodiment, the carrier of the target cell includes the second SUL carrier and the second uplink carrier, and after accessing the target cell, the method further includes: the sending unit 1200 is further used to send an uplink signal only on the second SUL carrier.

[0217] Optionally, in another embodiment, the receiving unit 1100 is further used to receive second downlink control information DCI from the target cell, and the processing unit 1300 is further used to parse the second DCI based on expectations of the second SUL carrier and the second uplink carrier.

[0218] Optionally, in another embodiment, after accessing the target cell, the method further includes: the receiving unit 1100 is further used to receive second information from the target cell, and the second information is used to indicate a third carrier of the target cell; the sending unit 1200 is further used to send an uplink signal on one of all carriers indicated by the target cell information and the second information.

[0219] In other embodiments, each unit of the communication device 1000 is further configured to perform the following steps and / or operations.

[0220] 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, where the carrier of the source cell includes at least one of a first auxiliary uplink SUL carrier and a first uplink carrier, wherein the first SUL carrier and the first uplink carrier share a cell identifier of the source cell; the receiving unit 1100 is further configured to receive a dual activation protocol stack DAPS switching message from the source cell, where the DAPS switching message includes target cell information, where the target cell information is used to indicate a carrier of the target cell, where 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, the sending unit 1200 is configured to send an uplink signal on one or two carriers of the source cell, and the processing unit 1300 is configured to initiate a random access process on one carrier of the target cell.

[0221] 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, sending 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 NUL carrier, the target cell information includes the second 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 sending unit 1200 is also used to send an uplink signal on the first SUL carrier and the first NUL carrier.

[0222] 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, 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 target cell information includes the second 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 sending unit 1200 is also used to send an uplink signal on the first SUL carrier and the first NUL carrier.

[0223] 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, sending an uplink signal on one or two carriers of the target cell.

[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, sending an uplink signal on one or two carriers of the target cell includes: when the information of the target cell includes the second SUL carrier and the second NUL carrier, the first information includes the first SUL carrier, and the second SUL carrier has the same frequency point as the first SUL carrier or belongs to the same frequency band, the sending unit 1200 is also used to send an uplink signal on the second SUL carrier, the second NUL carrier and the first SUL carrier.

[0225] 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, sending an uplink signal on one or two carriers of the target cell includes: when the information of the target cell includes the second SUL carrier and the second NUL carrier, the first information includes the first NUL carrier, and the second NUL carrier has the same frequency point as the first NUL carrier or belongs to the same frequency band, the sending unit 1200 is also used to send an uplink signal on the second SUL carrier, the second NUL carrier and the first NUL carrier.

[0226] Optionally, in another embodiment, the receiving unit 1100 is further used to receive second downlink control information DCI from the target cell, and the processing unit 1300 is further used to parse the second DCI based on expectations of the second SUL carrier and the second uplink carrier.

[0227] Optionally, in another embodiment, before receiving the first information, the method further includes: the sending unit 1200 is further used to send a first capability message to the source cell, and the first capability message includes indication information for indicating that the SUL scenario supports DAPS switching.

[0228] In other embodiments, each unit of the communication device 1000 is further configured to perform the following steps and / or operations.

[0229] The receiving unit 1100 is used 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 also used to receive a dual activation protocol stack DAPS switching message from the source cell, where the DAPS switching message includes target cell information, where the target cell information is used to indicate one or more carriers of the target cell; when a carrier of the source cell and a carrier of the target cell belong to the same frequency point or the same frequency band, the sending unit 1200 is used to send an uplink signal on one or two carriers of the source cell, and the processing unit 1300 is used to initiate a random access process on a carrier of the target cell.

[0230] Optionally, in one embodiment, the carrier of the target cell includes multiple carriers. After accessing the target cell, the method further includes: when at least one carrier of the source cell and at least one carrier of the target cell belong to the same frequency point or the same frequency band, the sending unit 1200 is also used to send an uplink signal on one or two carriers of the target cell.

[0231] In other embodiments, each unit of the communication device 1000 is further configured to perform the following steps and / or operations.

[0232] The receiving unit 1100 is used to receive first information from a source cell, where the first information is used to indicate a carrier of the source cell, where the carrier of the source cell includes at least one of a first auxiliary uplink SUL carrier and a first uplink carrier, wherein the first SUL carrier and the first uplink carrier share a cell identifier of the source cell; the receiving unit 1100 is also used to receive a dual activation protocol stack DAPS switching message from the source cell, where the DAPS switching message includes target cell information, where the target cell information is used to indicate a carrier of the target cell, where 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; the sending unit 1200 sends uplink signals respectively between the carrier of the source cell and the carrier of the target cell in a time division multiplexing manner based on a first time interval.

[0233] Optionally, in an embodiment, before receiving the DAPS switching message, the method further includes: the sending unit 1200 is further used to send second capability information to the source cell, where the second capability information is used to indicate the first time interval.

[0234] Optionally, in another embodiment, before receiving the first information, the method further includes: the sending unit 1200 is further used to send a first capability message to the source cell, and the first capability message includes indication information for indicating that the SUL scenario supports DAPS switching.

[0235] In other embodiments, each unit of the communication device 1000 is further configured to perform the following steps and / or operations.

[0236] The receiving unit 1100 is used 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 also used to receive a dual activation protocol stack DAPS switching message from the source cell, where the DAPS switching 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, the sending unit sends uplink signals respectively in a time division multiplexing manner based on a first time interval.

[0237] Optionally, in another embodiment, before receiving the DAPS switching message, the method further includes: the sending unit 1200 is further used to send second capability information to the source cell, where the second capability information is used to indicate the first time interval.

[0238] Optionally, the receiving unit 1100 and the sending unit 1200 in the communication device 1000 may also be integrated into a transceiver unit, having both receiving and sending functions, which is not limited here.

[0239] In one implementation, the communication device 1000 may be a terminal device in the method embodiment. In this implementation, 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.

[0240] In another implementation, the communication device 1000 may be a chip or integrated circuit in a terminal device. In this implementation, 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 input circuit, and the sending unit 1200 is an output interface or output circuit.

[0241] The processing unit 1300 may be a processing device. 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, wherein the at least one memory is used to store a computer program, and the at least one processor reads and executes the computer program stored in the at least one memory, so that the communication device 1000 performs the operations and / or processing performed by the terminal device in each method embodiment.

[0242] Alternatively, the processing device may include only a processor, and a memory for storing a computer program is located outside the processing device. The processor is connected to the memory through a circuit / wire to read and execute the computer program stored in the memory. Alternatively, in some examples, the processing device may also be a chip or an integrated circuit.

[0243] See also Figure 5 , Figure 5 1 is a schematic structural diagram of the communication device 10 provided in this application. 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 a computer program, and the processor 11 is used to call and run the computer program from the memory 12, so that the process and / or operation performed by the terminal device in each method embodiment of the present application is executed.

[0244] For example, the processor 11 may have Figure 4 The functions of the processing unit 1300 shown in FIG. 1 and FIG. 2 may include: Figure 4 Specifically, the processor 11 may be used to execute the processing or operation performed by the terminal device in each method embodiment, and the communication interface 13 is used to execute the sending and / or receiving actions performed by the terminal device in each method embodiment.

[0245] In one implementation, the communication device 10 may be a 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.

[0246] In another implementation, the communication device 10 may be a chip or an integrated circuit installed in a terminal device. In this implementation, the communication interface 13 may be an interface circuit or an input / output interface.

[0247] Optionally, the memory and processor in the above-mentioned device embodiments may be physically independent units, or the memory may be integrated with the processor, which is not limited in this document.

[0248] In addition, the present application also provides a computer-readable storage medium, in which computer instructions are stored. When the computer instructions are executed on a computer, the operations and / or processes performed by the terminal device in each method embodiment of the present application are executed.

[0249] 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 are run on a computer, the operations and / or processes performed by the terminal device in the various method embodiments of the present application are executed.

[0250] In addition, the present application also provides a chip, the chip including a processor. A memory for storing a computer program is provided independently of the chip, and the processor is used to execute the computer program stored in the memory, so that the operation and / or processing performed by the terminal device in any one of the method embodiments is executed.

[0251] Furthermore, the chip may further include a communication interface. The communication interface may be an input / output interface, or an interface circuit, etc. Furthermore, the chip may further include the memory.

[0252] In addition, the present application also provides a communication device (for example, a chip), including a processor and a communication interface, wherein 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 operations and / or processing performed by the terminal device in any method embodiment are executed.

[0253] In addition, the present application also provides a communication device, comprising at least one processor, wherein the at least one processor is coupled to at least one memory, and the at least one processor is used to execute a computer program or instruction stored in the at least one memory, so that the operations and / or processing performed by the terminal device in any method embodiment are executed.

[0254] In addition, the present application also provides a terminal device, including a processor, a memory and a transceiver. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory, and control the transceiver to send and receive signals, so that the terminal device performs the operation and / or processing performed by the terminal device in any one of the method embodiments.

[0255] The processor in the embodiment of the present application can be an integrated circuit chip with the ability to process signals. In the implementation process, each step of the above method embodiment can be completed by the hardware integrated logic circuit or software instructions in the processor. The processor can be a general processor, a digital signal processor (digital signal processor, DSP), an application specific integrated circuit (application specific integrated circuit, ASIC), a field programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The general processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the embodiment of the present application can be directly embodied as a hardware coding processor to perform, or the hardware and software modules in the coding processor are combined to perform. The software module can be located in a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, and other mature storage media in the art. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0256] 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 read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (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 and not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), and direct RAM bus 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.

[0257] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0258] 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 aforementioned method embodiments and will not be repeated here.

[0259] In the several embodiments provided in the present 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 only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as 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 mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0260] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0261] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0262] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. Among them, A, B and C can all be singular or plural, without limitation.

[0263] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard drives, ROM, RAM, magnetic disks, or optical disks.

[0264] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A communication method, characterized in that: include: receiving first information from a source cell, where the first information is used to indicate a carrier of the source cell, where the carrier of the source cell includes a first secondary uplink SUL carrier and a first uplink carrier, wherein the first SUL carrier and the first uplink carrier share a cell identifier of the source cell; receiving a dual activation protocol stack DAPS handover message from the source cell, where the DAPS handover message includes target cell information, where the target cell information is used to indicate a carrier of the target cell, where the carrier of the target cell includes a second SUL carrier and a second uplink carrier, where the second SUL carrier and the second uplink carrier share a cell identifier of the target cell; A carrier is selected from the first SUL carrier and the first uplink carrier to send an uplink signal, and a carrier is selected from the second SUL carrier and the second uplink carrier to initiate a random access process.

2. The method according to claim 1, characterized in that: The sending an uplink signal on one of the first SUL carrier and the first uplink carrier includes: An uplink signal is sent 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 uplink carrier.

3. The method according to claim 1, characterized in that: The sending an uplink signal on one of the first SUL carrier and the first uplink carrier includes: An uplink signal is sent only on the first SUL carrier.

4. The method according to claim 2 or 3, characterized in that Also includes: Receive first downlink control information DCI from the source cell, and parse the first DCI based on expectations of the first SUL carrier and the first uplink carrier.

5. The method according to any one of claims 1 to 3, characterized in that: After accessing the target cell, the method further includes: An uplink signal is sent 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, characterized in that: After accessing the target cell, the method further includes: An uplink signal is sent only on the second SUL carrier.

7. The method according to claim 5, characterized in that Also includes: Second downlink control information DCI is received from the target cell, and the second DCI is parsed based on the expectation of the second SUL carrier and the second uplink carrier.

8. The method according to any one of claims 1 to 3, characterized in that: Before receiving the DAPS switching message, the method further includes: Configuration information is received from the source cell, where the configuration information is used to release one of the first SUL carrier and the first uplink carrier.

9. The method according to any one of claims 1 to 3, characterized in that: After accessing the target cell, the method further includes: An uplink signal is sent 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: A first capability message is sent to the source cell, where the first capability message includes indication information for indicating that the SUL scenario supports DAPS switching.

11. A communication device, characterized in that: include: A processor, and a transceiver coupled to the processor; wherein, The processor is used to, via the transceiver: receiving first information from a source cell, where the first information is used to indicate a carrier of the source cell, where the carrier of the source cell includes a first secondary uplink SUL carrier and a first uplink carrier, wherein the first SUL carrier and the first uplink carrier share a cell identifier of the source cell; receiving a dual activation protocol stack DAPS handover message from the source cell, where the DAPS handover message includes target cell information, where the target cell information is used to indicate a carrier of the target cell, where the carrier of the target cell includes a second SUL carrier and a second uplink carrier, where the second SUL carrier and the second uplink carrier share a cell identifier of the target cell; A carrier is selected from the first SUL carrier and the first uplink carrier to send an uplink signal, and a carrier is selected from the second SUL carrier and the second uplink carrier to initiate a random access process.

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, wherein the carrier configured with the PUCCH is the first SUL carrier or the first uplink carrier.

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

14. The communication device according to claim 12 or 13, characterized in that: The processor is configured to: receive, through the transceiver, first downlink control information DCI from the source cell, and parse the first DCI based on expectations of the first SUL carrier and the first uplink carrier.

15. The communication device according to any one of claims 11 to 13, characterized in that: The processor is also used to, through the transceiver, send uplink signals only on a carrier configured with a physical uplink control channel PUCCH after accessing the target cell, wherein the carrier configured with the 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: After accessing the target cell, uplink signals are sent only on the second SUL carrier.

17. The communication device according to claim 15, characterized in that: The processor is further configured to: receive, through the transceiver, second downlink control information DCI from the target cell, and parse the second DCI based on 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: receive, through the transceiver, configuration information from the source cell before receiving the DAPS switching message, where the configuration information is used to release one of the first SUL carrier and the first uplink 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: An uplink signal is sent on one carrier among all 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: Before receiving the first information, a first capability message is sent to the source cell, where the first capability message includes indication information for indicating that the SUL scenario supports DAPS switching.

21. A communication device, characterized in that: The method comprises a processor and an interface circuit, wherein the interface circuit is used to receive computer program instructions and transmit the instructions to the processor, and the processor is used to execute the computer program instructions to implement the method according to any one of claims 1 to 10.

22. A communication device, characterized in that: The system comprises at least one processor coupled to at least one memory, and the at least one processor is configured to execute computer program instructions stored in the at least one memory to implement the method according to any one of claims 1 to 10.

23. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program. When the computer program is executed, the method according to any one of claims 1 to 10 is implemented.

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