Communication method, communication device and system

Abstract

Disclosed are a communication method, a communication device and a system, the method comprising: a terminal acquiring first information and second information on a first carrier, the first information being used for indicating carrier switching, the second information being used for indicating a first random access resource or a first random access preamble or identity information of the terminal; and the terminal performs non-competitive access on the second carrier based on the first information and the second information. In the method, the terminal can quickly realize random access after carrier switching.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to communication methods, communication devices, and systems. Background Technology

[0002] Currently, in multi-carrier scenarios (e.g., multiple carriers configured on the network side for initial access or data transmission), the network side can broadcast initial access resource information of other carriers (or non-anchor carriers) on one of the multiple carriers (or anchor carriers), such as configuration information of random access channel (RACH) resources; correspondingly, the terminal can select one carrier (e.g., anchor carrier or non-anchor carrier) as the target carrier to send a random access preamble (RA preamble).

[0003] However, the above methods result in slow terminal random access speeds, and how to quickly achieve random access is a problem that the industry urgently needs to discuss. Summary of the Invention

[0004] This application discloses a communication method, a communication device, and a system, in which a terminal can quickly achieve random access after switching carriers.

[0005] The present application is described below from different aspects. It should be understood that the different implementation methods and beneficial effects described below can be referenced from each other.

[0006] In a first aspect, this application provides a communication method that can be executed by a first communication device, which may be a terminal or a module of a terminal (e.g., a chip or chip system or integrated circuit or control unit), or a software and / or hardware module for implementing terminal functions.

[0007] In the first aspect and its possible implementations, the method is described as being executed by a terminal. The method includes: the terminal acquiring first information and second information on a first carrier, the first information indicating carrier switching, and the second information indicating a first random access resource, a first random access preamble, or the terminal's identity information; the terminal performing non-contention-based access on a second carrier based on the first and second information.

[0008] In this embodiment of the application, the terminal can perform non-contention access on the switched carrier (i.e., the second carrier) based on the first information and the second information on the first carrier. This method can use the information of the anchor carrier (i.e., the first carrier mentioned above) to resolve access conflicts on the target carrier (i.e., the second carrier mentioned above) and improve the speed of random access after the terminal switches carriers.

[0009] In addition, the network device can instruct the terminal to perform carrier switching through the second information, so that the network device and the terminal can transmit the initial access resource information again based on the second information. In this way, the method can avoid the waste of communication resources (such as the waste of the spectrum resources of the anchor carrier) caused by the network device continuously broadcasting the initial access resource information on the first carrier (or anchor carrier).

[0010] Alternatively, network devices can establish a connection with the terminal on the anchor carrier (such as the first carrier mentioned above), and then configure other carriers and indicate carrier switching via radio resource control protocol (RRC) reconfiguration signaling. However, this method requires the entire connection establishment process to be completed on the anchor carrier before switching can occur, consuming significant resources. Compared to this method, the embodiments of this application can indicate carrier switching during random access using the second information, thereby improving the flexibility of carrier switching and avoiding the waste of communication resources.

[0011] The embodiments of this application can also be applied to scenarios where multiple communication systems share spectrum, such as in the scenario where new radio (NR) systems and future communication systems share spectrum. Since network devices establish a connection with the terminal on a low-frequency shared carrier (i.e., the anchor carrier in this scenario) and then configure other carriers and indicate carrier switching via RRC reconfiguration signaling, the embodiments of this application do not need to wait until the signaling radiobearer (SRB)1 is established on the low-frequency shared carrier and the non-access stratum (NAS) signaling is exchanged, encryption and integrity protection are established, capability reporting is performed, etc. before performing carrier switching, thereby greatly saving the resources of the low-frequency shared carrier.

[0012] In this application, "acquire" can be replaced with "receive," and "output" can be replaced with "send." For example, the network device acquiring first information on the first carrier can mean that the network device receives first information on the first carrier; the network device outputting second information can mean that the network device sends second information. "Send" can also be understood as the "output" of the chip interface, and "receive" can also be understood as the "input" of the chip interface. In other words, "send" or "receive" can occur between devices, for example, between a base station and a terminal via an air interface; or "send" or "receive" can occur within a device, for example, between components, modules, chips, software modules, or hardware modules within the device via a bus, wiring, or interface. Further details will not be elaborated upon below.

[0013] In conjunction with the first aspect, in one possible implementation, the second information is used to indicate the first random access resource or the first random access preamble. The terminal acquiring the first information and the second information on the first carrier includes: the terminal acquiring a conflict resolution message on the first carrier, the conflict resolution message including the first information and the second information.

[0014] In this embodiment, the first and second information are carried in a conflict resolution message (or message 4, or simply msg4). Compared to indicating carrier handover in the random access response (or message 2, or simply msg2) phase, this method can fully utilize the information in the anchor carrier message 4 to provide a faster conflict resolution method for the target carrier (i.e., the second carrier) after handover. The carrier handover of the terminal is more flexible, the access after handover is faster, and the overhead is less.

[0015] In conjunction with the first aspect, in one possible implementation, the second information is used to indicate the first random access resource, and the second information is also used to indicate the configuration information of the synchronization signal block (SSB). The terminal performs non-contention access on the second carrier based on the first information and the second information, including: the terminal detects the SSB on the second carrier based on the SSB configuration information; and initiates random access on the second carrier based on the first random access resource and the detected SSB.

[0016] In this embodiment of the application, the first random access resource can be a non-contention random access resource configured by the network device for the terminal. Then, the terminal can initiate non-contention access on the second carrier based on the first random access resource and the detected SSB to avoid contention conflicts.

[0017] In conjunction with the first aspect, in one possible implementation, the configuration information of the SSB is used to indicate the SSB frequency of the second carrier.

[0018] In conjunction with the first aspect, in one possible implementation, the configuration information of the SSB is further used to indicate a preset beam direction, and detecting the SSB on the second carrier includes detecting the SSB in the preset beam direction of the second carrier.

[0019] In conjunction with the first aspect, in one possible implementation, the first random access resource includes a random access timing (RACH Occasion, RO) resource and / or a second random access preamble.

[0020] In this embodiment, the first random access resource includes RO resources, which can be non-contention RO resources configured by the network device for the terminal; the second random access preamble can be a non-contention preamble configured by the network device for the terminal. Therefore, the terminal can initiate non-contention access on the second carrier based on the non-contention RO resources and / or the non-contention preamble, thus avoiding contention conflicts.

[0021] The first random access preamble and the second random access preamble may be the same or different, and this application does not limit them.

[0022] In conjunction with the first aspect, in one possible implementation, the first information and / or the second information are carried in the first media access control (MAC) sub-protocol data unit (PDU) in the conflict resolution message or in the common control channel (CCCH) in the conflict resolution message.

[0023] In conjunction with the first aspect, in one possible implementation, the second information is used to indicate the first random access preamble, and the terminal performs non-contention access on the second carrier based on the first and second information, including: the terminal receiving a first random access response (RA response, RAR) on the second carrier; the first random access response includes third information, which is used to indicate the third random access preamble; if the first random access preamble and the third random access preamble match, it is determined that access on the second carrier is successful.

[0024] In this embodiment, the first random access preamble can be a non-contention preamble configured by the network device for the terminal. If the first random access preamble and the third random access preamble match, it is determined that access on the second carrier is successful. This method can resolve access conflicts.

[0025] In conjunction with the first aspect, in one possible implementation, the second information is used to indicate the identity information of the terminal. The acquisition of the first information and the second information on the first carrier includes: acquiring a conflict resolution message on the first carrier, the conflict resolution message including the first information; and acquiring a second random access response on the first carrier, the second random access response including the second information.

[0026] In conjunction with the first aspect, in one possible implementation, the second information is used to indicate the terminal's identity information. The terminal performs non-contention access on the second carrier based on the first and second information, including: the terminal detects the physical downlink control channel (PDCCH) on the second carrier based on the second information; if the PDCCH is detected on the second carrier, it is determined that access on the second carrier is successful.

[0027] In conjunction with the first aspect, in one possible implementation, the terminal identity information indicated by the second information may be a temporary network-side identity identifier (TC-RNTI). The conflict resolution message further includes fourth information, which indicates at least one of the following: downlink timing advance (TA) information corresponding to the second carrier, uplink TA information corresponding to the second carrier, configuration information of the second carrier, and initial downlink partial bandwidth (BWP) configuration. The terminal's detection of the PDCCH on the second carrier based on the second information includes: the terminal detecting the PDCCH on the second carrier based on the TC-RNTI and the fourth information.

[0028] In conjunction with the first aspect, in one possible implementation, the method further includes: the terminal sending a response message indicating that the first information and / or the second information has been acquired.

[0029] In this embodiment of the application, after the terminal receives the first information and / or the second information on the first carrier, it can send a response message. Then, the network device can activate the second carrier after receiving the response message, thereby achieving the effect of activating the second carrier (such as a high-frequency carrier) on demand to save power.

[0030] Secondly, this application provides a communication method that can be executed by a second communication device, which may be a network device or a module of a network device (e.g., a chip or chip system or integrated circuit or control unit), or a software and / or hardware module for implementing the functions of a network device.

[0031] In the second aspect and its possible implementations, the method is described as being performed by a network device. The method includes: the network device outputting first information and second information on a first carrier, the first information indicating carrier switching, and the second information indicating a first random access resource, a first random access preamble, or terminal identity information; the first and second information are used for non-contention-based access on the second carrier.

[0032] In conjunction with the second aspect, in one possible implementation, the second information is used to indicate the first random access resource or the first random access preamble. The network device outputs the first information and the second information on the first carrier, including: the network device outputs a conflict resolution message on the first carrier, the conflict resolution message including the first information and the second information.

[0033] In conjunction with the second aspect, in one possible implementation, the second information is used to indicate the first random access resource, and the second information is also used to indicate the configuration information of the SSB. The method further includes: the network device transmitting the SSB on the second carrier based on the configuration information of the SSB; and obtaining the random access request output by the terminal on the second carrier.

[0034] In conjunction with the second aspect, in one possible implementation, the configuration information of the SSB is used to indicate the SSB frequency of the second carrier.

[0035] In conjunction with the second aspect, in one possible implementation, the configuration information of the SSB is also used to indicate a preset beam direction, and the method further includes: outputting the SSB in the preset beam direction of the second carrier.

[0036] In conjunction with the second aspect, in one possible implementation, the first random access resource includes RO resources and / or a second random access preamble.

[0037] In conjunction with the second aspect, in one possible implementation, the first information and / or the second information are carried in the first MAC sub-PDU of the conflict resolution message or the CCCH of the conflict resolution message.

[0038] In conjunction with the second aspect, in one possible implementation, the second information is used to indicate a first random access preamble, and the method further includes: a network device outputting a first random access response on a second carrier; the first random access response includes third information, the third information being used to indicate a third random access preamble, the third random access preamble being associated with the first random access preamble.

[0039] In conjunction with the second aspect, in one possible implementation, the second information is used to indicate the identity information of the terminal. The network device outputs the first information and the second information on the first carrier, including: the network device outputs a conflict resolution message on the first carrier, the conflict resolution message including the first information; and outputs a second random access response on the first carrier, the second random access response including the second information.

[0040] In conjunction with the second aspect, in one possible implementation, the second information is used to indicate the identity information of the terminal, and the method further includes: the network device transmitting a PDCCH on a second carrier based on the second information, the PDCCH being used for non-contention access on the second carrier.

[0041] In conjunction with the second aspect, in one possible implementation, the terminal's identity information is TC-RNTI, and the conflict resolution message further includes fourth information, which is used to indicate at least one of the following: downlink timing advance TA information corresponding to the second carrier, uplink TA information corresponding to the second carrier, configuration information of the second carrier, or initial downlink partial bandwidth (BWP) configuration; wherein, TC-RNTI and the fourth information are used to detect PDCCH on the second carrier.

[0042] In conjunction with the second aspect, in one possible implementation, the method further includes: the network device receiving a response message, the response message indicating that first information and / or second information has been acquired; and activating a second carrier based on the response message.

[0043] Thirdly, this application provides a communication device, which may be a network device or a chip / circuit therein. The communication device is used to perform the methods of the first aspect or any possible implementation thereof. The communication device includes units having the ability to perform the methods of the first aspect or any possible implementation thereof.

[0044] Fourthly, this application provides a communication device, which may be a terminal or a chip / circuit therein. The communication device is used to perform the method in the second aspect or any possible implementation thereof. The communication device includes units having the ability to perform the method in the second aspect or any possible implementation thereof.

[0045] In the third or fourth aspect, the aforementioned communication device may include a transceiver unit and a processing unit. Further details regarding the transceiver unit and processing unit can be found in the device embodiments shown below. The beneficial effects of the third to fourth aspects can be referenced in the relevant descriptions of the first to second aspects, and will not be repeated here.

[0046] Fifthly, this application provides a communication device, which includes a processor for executing the method described in the first aspect, or the second aspect, or any possible implementation thereof.

[0047] In a sixth aspect, this application provides a communication device including a processor coupled to a memory storing instructions that, when executed by the processor, cause the communication device to perform the method described in any possible implementation of the first aspect, the second aspect, or any of the aspects described above.

[0048] In one possible implementation, the communication device further includes a memory. Optionally, the processor and memory are integrated (i.e., the memory is built-in memory). Optionally, the memory and processor are independently configured (i.e., the memory is external memory).

[0049] In a seventh aspect, this application provides a communication device that may include a processor and an interface circuit connected together. The interface circuit is used for exchanging (or sending / receiving or inputting / outputting) information or data, and the processor is used to execute program instructions that cause the communication device to perform the methods described in any possible implementation of the first aspect, the second aspect, or any of the aspects above. The interface circuit may be a communication interface or a transceiver. The transceiver may be a radio frequency module in the communication device, or a combination of a radio frequency module and an antenna, or an input / output interface of a chip or circuit.

[0050] Eighthly, this application provides a readable storage medium storing program instructions that, when run on a computer, cause the computer to perform the method described in any possible implementation of the first aspect, the second aspect, or any of the aspects described above.

[0051] Ninthly, this application provides a program product containing program instructions that, when run, cause the method described in any possible implementation of the first aspect, or the second aspect, or any of the aspects above to be executed.

[0052] Tenthly, this application provides an apparatus, which can be implemented as a chip or as a device, including a processor. The processor is used to read and execute a program stored in a memory to execute one or more of the first aspect, or the second aspect, or one or more of any possible implementations of any aspect, providing an information interaction method. Optionally, the apparatus further includes a memory connected to the processor via a circuit. Further optionally, the apparatus includes a communication interface to which the processor is connected. The communication interface is used to receive information to be processed, the processor obtains the information from the communication interface, processes the information, and outputs the processing result through the communication interface. The communication interface can be an input / output interface.

[0053] In one possible implementation, the processor and memory can be physically independent units, or the memory can be integrated with the processor.

[0054] In one aspect, this application provides a communication system, which includes a first communication device (such as a network device) and a second communication device (such as a terminal); wherein the first communication device is used to perform the method described in the first aspect or any possible implementation of the first aspect, and the second communication device is used to perform the method described in the second aspect or any possible implementation of the second aspect.

[0055] The technical effects achieved in the above aspects can be referred to each other or to the beneficial effects in the method embodiments shown below, which will not be repeated here. Attached Figure Description

[0056] Figure 1 This is a schematic diagram of the initial access process provided in an embodiment of this application;

[0057] Figure 2A This is a schematic diagram of an SSB provided in an embodiment of this application;

[0058] Figure 2B This is a schematic diagram of a time-frequency resource provided in an embodiment of this application;

[0059] Figure 3 This is a schematic diagram of the system architecture of a communication system provided in an embodiment of this application;

[0060] Figure 4 This is a flowchart illustrating a communication method provided in an embodiment of this application;

[0061] Figure 5A This is a flowchart illustrating another communication method provided in an embodiment of this application;

[0062] Figure 5B This is a schematic diagram of a carrier switching method provided in an embodiment of this application;

[0063] Figure 5C This is a schematic diagram of a terminal behavior provided in an embodiment of this application;

[0064] Figure 6A This is a flowchart illustrating another communication method provided in an embodiment of this application;

[0065] Figure 6B This is a schematic diagram of a carrier switching method provided in an embodiment of this application;

[0066] Figure 6C This is a schematic diagram of a terminal behavior provided in an embodiment of this application;

[0067] Figure 7A This is a flowchart illustrating another communication method provided in an embodiment of this application;

[0068] Figure 7BThis is a schematic diagram of a carrier switching method provided in an embodiment of this application;

[0069] Figure 7C This is a schematic diagram of a terminal behavior provided in an embodiment of this application;

[0070] Figure 7D These are schematic diagrams illustrating different MAC sub-PDU formats provided in embodiments of this application;

[0071] Figure 8 This is a schematic diagram of the structure of the communication device provided in an embodiment of this application;

[0072] Figure 9 This is another structural schematic diagram of the communication device provided in the embodiments of this application;

[0073] Figure 10 This is another structural schematic diagram of the communication device provided in the embodiments of this application. Detailed Implementation

[0074] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0075] In the description of this application, the terms "first," "second," etc., are used only to distinguish different objects and do not limit the quantity or order of execution, nor do they imply that they are necessarily different. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0076] In the description of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. "And / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Furthermore, "at least one item", "one or more of the following", or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c can represent: a, b, c; a and b; a and c; b and c; or a and b and c. Here, a, b, and c can be single or multiple.

[0077] In the description of this application, the words "exemplary" or "for example" are used to indicate that something is an example, illustration, or illustration. Any embodiment or design that is described as "exemplary," "for example," or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Rather, the use of the words "exemplary," "for example," or "for example" is intended to present the relevant concepts in a specific manner.

[0078] It is understood that in the description of this application, "when," "if," and "if" all refer to the device performing a corresponding action under certain objective circumstances, and are not time-limited, nor do they require the device to perform a judgment action when it is implemented, nor do they imply any other limitations. The device performing a corresponding action under certain objective circumstances includes: satisfying the objective circumstances, i.e., being able to perform the corresponding action; or satisfying both the objective circumstances and other circumstances, in order to perform the corresponding action.

[0079] In this application, the use of singular designations for elements is intended to represent "one or more" rather than "one and only one," unless otherwise specified.

[0080] In addition, the terms “system” and “network” are often used interchangeably in this article.

[0081] It is understood that in the various embodiments of this application, expressions such as "A corresponds to B", "A and B correspond", "A corresponds to B" or similar expressions indicate that B is associated with A, and B can be determined based on A. Determining B based on A does not mean that B is determined solely based on A; B can also be determined based on A and / or other information.

[0082] First, let's introduce the random access process.

[0083] Initial access in cellular systems (such as NR systems and future communication systems) is crucial for a terminal's first connection to the network.

[0084] For example, Figure 1 This is a schematic diagram of the initial access process provided in an embodiment of this application. For example... Figure 1 As shown, the initial access process in the NR system can be as follows:

[0085] Step S1: The user equipment (UE) sends message1 (or msg1 for short) to the network. Message1 can be a random access preamble. Message1 can also be called a random access request.

[0086] For example, the UE can first search for the SSB to obtain the downlink SSB, which contains the master information block (MIB); then, by decoding the downlink SSB (hereinafter referred to as SSB), it can obtain other system messages required for cell access, such as system information block (SIB1). Figure 2A As shown, the horizontal axis represents time, and the vertical axis represents frequency. The SSB includes indication information for physical resource coreset#0, which the terminal can use to determine coreset#0; then, it can obtain SIB1 based on coreset#0. SIB1 indicates the resource configuration used by the UE to initiate random access. This resource configuration includes carrier position and bandwidth, initial uplink BWP configuration, and initial downlink BWP configuration, etc. The initial uplink BWP configuration includes the RACH resource configuration, which is mainly used by the UE to send the random access preamble (i.e., message 1). This configuration includes the time-frequency resources (RO resources) for the random access opportunity (RACH Occasion, RO) and the available random access preamble.

[0087] Therefore, the UE can randomly select an RO and a random access preamble based on SIB1 for transmission. In other words, the UE transmits message1, i.e., transmits the random access preamble, on the selected RO. Figure 2B The example shows RO resources located in several RACH slots in the initial uplink BWP configuration, with gray rectangles representing RO resources selected by the UE.

[0088] Step S2: After receiving message 1 (i.e., the random access preamble is detected), the network side can send message 2 (or message 2 for short). Message 2 can also be called the random access response.

[0089] Message 2 includes the random access preamble identifier (ID) received by the network side, and contains the TA command, the temporary network side identity identifier (temporary C-RNTI, TC-RNTI), and the uplink resource (UL Grant) for the UE to further send message 3 (or msg3 for short).

[0090] Step S3: If the UE receives message 2 within the specified time window, and the random access preamble ID contained in message 2 corresponds to the random access preamble previously sent by the UE, then the UE can send message 3 in the scheduled UL Grant resource. Message 3 is mainly used for conflict resolution, and it contains the UE's identity information. The value of the aforementioned time window can also be indicated in SIB1.

[0091] Step S4: The UE can listen for message 4 (or simply message 4) sent by the network side within a time window. If the UE contention resolution identity field in message 4 is the same as the identity information reported in message 3, the UE considers its access request to have won the competition, the access conflict has been successfully resolved, and the UE uses the TC-RNTI received in message 2 as its unique identifier (cell radio network temporary identifier, C-RNTI) in this cell. Message 4 can also be called the contention resolution message.

[0092] Next, we will introduce the scheme for download wave switching in multi-carrier access scenarios.

[0093] Option 1: The network side broadcasts the initial access resource information of the non-anchor carrier, and the terminal performs carrier switching based on the broadcast.

[0094] For example, during multi-carrier initial access configuration, the network can broadcast initial access resource information for other carriers, such as RACH resource configuration, on one of the carriers (or anchor carrier). The UE can choose one of the carriers to send the random access preamble. For example, the network can configure a low-frequency supplementary uplink (SUL) carrier to solve the uplink coverage problem of the initial access random access preamble, i.e., configure a low-frequency SUL carrier as the coverage CC. For example, the anchor carrier can refer to the initial carrier used by the terminal for SSB detection.

[0095] For example, in a scenario where NR and future communication systems share spectrum, a shared carrier (usually in a low-frequency band) between the NR and future communication systems can be used as an anchor carrier. The network side can broadcast information required for access to the dedicated carrier of the future communication system (usually located in a higher frequency band), such as synchronization information and system messages, on the anchor carrier. For instance, the anchor carrier indicates resource information of the non-anchor carrier, such as SSB and system information (SI).

[0096] In summary, for the aforementioned multi-carrier access scenarios, the initial access resource information for other non-anchor carriers (such as SUL carriers or dedicated carriers for future communication systems) is carried by SIB1 in the anchor carrier. In this scheme, even if there is no access requirement on other carriers, the uplink access resources and configuration information of other carriers are continuously broadcast on the anchor carrier, resulting in a waste of the anchor carrier's spectrum resources.

[0097] Option 2: After the network side and the terminal establish a connection on the anchor carrier, the network side then uses RRC reconfiguration signaling to configure other carriers and indicate carrier switching.

[0098] This method can switch UEs (such as future communication system devices) accessing on a shared carrier to a carrier dedicated to the future communication system. However, this method requires the entire connection establishment process to be completed on the shared carrier of the NR and the future communication system before the switch can be made, which is not very flexible. In addition, it requires a lot of resources to be consumed on the low-frequency shared carrier (the low-frequency shared carrier usually has better coverage, but the future communication system carrier has a larger capacity).

[0099] In the above methods, the terminal's random access speed after carrier switching is relatively slow.

[0100] In view of this, this application provides a communication method, a communication device, and a system. In this method, a terminal can perform non-contention access on a switched carrier (i.e., a second carrier) based on first information and second information on a first carrier. The first information is used to indicate carrier switching, and the second information is used to indicate a first random access resource, a first random access preamble, or the terminal's identity information. This method can improve the speed of random access after the terminal switches carriers.

[0101] Based on the above, in order to better understand the communication method and related apparatus proposed in this application, the system architecture of the embodiments of this application will be described below.

[0102] The technical solutions of this application can be applied to: 5th generation (5G) or NR systems, long term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, wireless local area network (WLAN) systems, satellite communication systems, future communication systems, or integrated systems of multiple systems. The technical solutions provided in this application can also be applied to device-to-device (D2D) communication, vehicle-to-everything (V2X) communication, machine-to-machine (M2M) communication, machine-type communication (MTC), and Internet of Things (IoT) communication systems or other communication systems.

[0103] Please see Figure 3 , Figure 3 This is a schematic diagram of the system architecture of a communication system provided in an embodiment of this application.

[0104] like Figure 3 As shown, the communication system may include network device 101 and terminal 102.

[0105] In this embodiment, terminal 102 sends first information to network device 101 on a first carrier. Correspondingly, network device 101 receives the first information from terminal 102 on the first carrier. The first information is used to request random access. Subsequently, network device 101 sends second information to terminal 102. Correspondingly, terminal 102 receives the second information from network device 101. The second information is used to indicate carrier switching. For details, please refer to the embodiments below, which will not be elaborated here.

[0106] Network device 101 can be an entity used to transmit or receive signals, or a device used to communicate with terminal 102. This network device can be a base station (BTS) in a Global System for Mobile Communications (GSM) or Code Division Multiple Access (CDMA) system, a base station (NodeB, NB) in a Wideband Code Division Multiple Access (WCDMA) system, an evolved NodeB (eNB or eNodeB) in an LTE system, a radio controller in a cloud radio access network (CRAN) scenario, or a relay station, access point, vehicle-mounted device, wearable device, or network device in a 5G network or a future evolved PLMN network. It can also be an access node or other network device in a future wireless communication system. This application embodiment is not limited to these categories. The network device can be a device in a wireless network, such as connecting terminal 102 to a RAN node in a wireless network. Currently, some examples of RAN nodes include: base stations, next-generation base stations (gNBs), transmission reception points (TRPs), transmission points (TPs), evolved Node Bs (eNBs), home base stations, baseband units (BBUs), or access points (APs) in WiFi systems. In a network architecture, network equipment can include central unit (CU) nodes, distributed unit (DU) nodes, or RAN equipment including both CU and DU nodes. In O-RAN systems, CUs can also be called O-CUs, and DUs can also be called O-DUs.

[0107] Terminal 102 is a user-side entity used to receive or transmit signals, primarily for enabling wireless communication with network device 101.

[0108] For example, terminal 102 can be an access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment, user agent, or user device. Terminal 102 can also be a mobile phone, cellular phone, cordless phone, session initiation protocol (SIP) phone, tablet or pad, computer with wireless transceiver capabilities, virtual reality (VR) terminal, augmented reality (AR) terminal, wireless terminal in industrial control, wireless local loop (WLL) station, personal digital assistant (PDA), handheld device with wireless communication capabilities, computing device or other processing device connected to a wireless modem, in-vehicle equipment, wireless terminal in self-driving, wireless terminal in telemedicine or telehealth services, wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, or wireless terminal in smart home. The terminal 102 can be a wireless terminal in the home, a wearable device (such as a smartwatch, smart bracelet, pedometer, etc.), a terminal in a 5G network, or a terminal in a future evolved public land mobile network (PLMN), etc., and this application embodiment is not limited to these. The terminal 102 can be deployed on land, including indoors or outdoors, handheld, wearable, or vehicle-mounted, and can also be deployed on water (such as ships), in the air (such as airplanes, balloons, etc.), and on non-terrestrial networks (NTNs) such as satellites. In this application embodiment, the terminal 102 can be a legacy UE, or an RB-level partial frequency hopping (RPFS) UE that supports sounding reference signal (SRS) coverage and capacity enhancement, or other UEs. This application does not limit the type of terminal 102. Among them, legacy UE refers to user equipment that supports existing mechanisms, such as user equipment that supports release-15 and release-16.

[0109] In this embodiment, the terminal 102 or network device 101 includes a hardware layer, an operating system layer running on top of the hardware layer, and an application layer running on top of the operating system layer. The hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also called main memory). The operating system can be any one or more computer operating systems that implement business processing through processes, such as Linux, Unix, Android, iOS, or Windows. The application layer includes applications such as browsers, address books, word processing software, and instant messaging software. Furthermore, this embodiment does not specifically limit the specific structure of the execution entity of the method provided in this embodiment, as long as it can communicate according to the method provided in this embodiment by running a program that records the code of the method provided in this embodiment. For example, the execution entity of the method provided in this embodiment can be the terminal 102 or network device 101, or a functional module in the terminal 102 or network device 101 that can call and execute a program.

[0110] It should be noted that, Figure 3 The number and type of terminals 102 included in the system architecture shown are merely examples, and the embodiments of this application are not limited thereto. For example, there may be more or fewer terminals 102 communicating with network device 101, but for the sake of simplicity, they are not described one by one in the accompanying drawings.

[0111] In addition, in such Figure 3 In the system architecture shown, although network device 101 and terminal 102 are shown, the application scenario may not be limited to network device 101 and terminal 102. For example, it may also include core network devices or devices used to carry virtualized network functions, wherein the core network devices communicate with network device 101 and terminal 102.

[0112] It should be noted that, Figure 3 The number and types of network elements included in the system architecture shown are merely examples, and the embodiments of this application are not limited thereto. For example, it may also include more or fewer devices communicating with the gateway; for the sake of brevity, they are not described one by one in the accompanying drawings.

[0113] Based on the above system architecture, a communication method provided by an embodiment of this application will be described below.

[0114] Please see Figure 4 , Figure 4This is a flowchart illustrating a communication method provided in an embodiment of this application.

[0115] In this embodiment, the execution is performed by a network device, which may also be a module (e.g., a chip, chip system, integrated circuit, or control unit) within the network device; in this embodiment, the execution is performed by a terminal, which may also be a module (e.g., a chip, chip system, integrated circuit, or control unit) within the terminal.

[0116] like Figure 4 As shown, the communication method may include the following steps:

[0117] S401: The network device outputs first information and second information on the first carrier. The first information is used to indicate carrier switching, and the second information is used to indicate the first random access resource, the first random access preamble, or the identity information of the terminal.

[0118] Accordingly, the terminal acquires first information and second information on the first carrier.

[0119] For example, if the second information is used to indicate the first random access resource or the first random access preamble, the second information can be carried in the conflict resolution message. For instance, the network device outputs a conflict resolution message on the first carrier, and correspondingly, the terminal obtains the conflict resolution message on the first carrier. The conflict resolution message includes the first information and the second information, wherein the second information is used to indicate the first random access resource or the first random access preamble.

[0120] As another example, if the second information is used to indicate the terminal's identity information, then the second information can be carried in the second random access response on the first carrier. For example, the network device outputs a conflict resolution message on the first carrier, the conflict resolution message including the first information, and correspondingly, the terminal obtains the conflict resolution message on the first carrier; the network device outputs a second random access response on the first carrier, the second random access response including the second information, and correspondingly, the terminal obtains the second random access response on the first carrier.

[0121] S402: The terminal performs non-contention access on the second carrier based on the first information and the second information.

[0122] For example, non-contention access on the second carrier by the terminal can include the following three implementation methods:

[0123] In the first implementation: the second information is used to indicate the first random access resource, and also to indicate the configuration information of the SSB. The network device transmits the SSB on the second carrier based on the SSB configuration information; correspondingly, the terminal detects the SSB on the second carrier based on the SSB configuration information; the terminal initiates random access on the second carrier based on the first random access resource and the detected SSB, for example, the terminal sends a random access request to the network device, and the network device receives the random access request from the terminal.

[0124] Optionally, the SSB configuration information is also used to indicate the preset beam direction, and the network device outputs the SSB in the preset beam direction of the second carrier; correspondingly, the terminal detects the SSB in the preset beam direction of the second carrier.

[0125] For example, the first random access resource includes RO resources and / or a second random access preamble.

[0126] Optionally, the first and / or second information may be carried in the first MAC sub-PDU of the conflict resolution message or the CCCH of the conflict resolution message.

[0127] The second implementation method is as follows: the second information is used to indicate the first random access preamble, and the network device outputs the first random access response on the second carrier; the terminal receives the first random access response on the second carrier; the first random access response includes the third information, which is used to indicate the third random access preamble; if the terminal determines that the first random access preamble and the third random access preamble match, it determines that the access on the second carrier is successful.

[0128] The third implementation method: The second information is used to indicate the terminal's identity information. Based on the second information, the terminal detects the PDCCH on the second carrier. If the PDCCH is detected on the second carrier, the terminal determines that the access on the second carrier has been successful.

[0129] For example, the terminal's identity information is TC-RNTI, and the conflict resolution message also includes fourth information, which indicates at least one of the following: downlink timing advance (TA) information corresponding to the second carrier, uplink TA information corresponding to the second carrier, configuration information of the second carrier, and initial downlink partial bandwidth (BWP) configuration; then, the terminal can detect PDCCH on the second carrier based on TC-RNTI and the fourth information.

[0130] Optionally, the terminal may send a response message when acquiring the first information and / or the second information. The response message indicates that the first information and / or the second information has been acquired. Subsequently, the network device may activate the second carrier based on the response message.

[0131] above Figure 4The method embodiments shown include many possible implementation schemes, which will be discussed below. Figures 5A to 7D Some of the implementation schemes will be illustrated with examples. It should be noted that... Figures 5A to 7D For any unexplained related concepts, operations, or logical relationships, please refer to [link / reference]. Figure 4 The corresponding description in the illustrated embodiment.

[0132] In this application, Figures 5A to 7D The illustrated embodiment can be considered as a standalone embodiment. Figures 5A to 7D The embodiments shown can all be implemented without relying on Figure 4 The technical solution; Figures 5A to 7D Some of the steps in the illustrated embodiments can also be used as separate embodiments.

[0133] Figure 5A This is a flowchart of another communication method provided in an embodiment of this application.

[0134] This application embodiment exemplifies the use of second information to indicate a first random access resource (or non-contention-based random access resource). The first and second information are carried in message 4 (i.e., conflict resolution message). The first information is the first field (or handover indication field) in message 4, and the second information is the second field in message 4.

[0135] In this embodiment of the application, after receiving message 4 on the first carrier (or anchor carrier), the terminal switches to the second carrier (or target carrier) and receives SSB on the second carrier.

[0136] like Figure 5A As shown, the method may include the following steps:

[0137] S501: The terminal sends message 1 on the first carrier.

[0138] Accordingly, the network device receives message 1 from the terminal on the first carrier.

[0139] S502: The network device sends message 2 on the first carrier.

[0140] Accordingly, the terminal receives message 2 from the network device on the first carrier.

[0141] S503: The terminal sends message 3 on the first carrier.

[0142] Accordingly, the network device receives message 3 from the terminal on the first carrier.

[0143] The specific implementation of steps S501 to S503 above can be referred to the four-step random access process, and an example can be found here. Figure 1 Related content.

[0144] S504: The network device sends message 4 on the first carrier. Message 4 includes a first field, a second field, and SSB information of the second carrier. The first field is used to indicate carrier switching, and the second field is used to indicate non-contention random access resources.

[0145] Accordingly, the terminal receives message 4 from the network device on the first carrier.

[0146] Non-contention-based random access resources refer to the non-contention-based random access resources allocated by the network device to the terminal on the beam corresponding to the configured SSB, such as a specific RO or preamble. It should be understood that the first field can also be referred to as the first field.

[0147] Optionally, message 4 may also include a UE contention resolution identity field and SSB configuration information (i.e., SSB information of the second carrier). The SSB configuration information may include the SSB frequency of the second carrier (or target carrier) and a specific beam SSB indication (based on the QCL relationship, the portion of SSBs the terminal needs to detect on the second carrier). The SSB frequency of the second carrier and the specific beam SSB indication are used to detect the SSBs of the second carrier. It should be understood that the SSB configuration information may also be carried in the SIB message, and this application does not limit this.

[0148] S505: The terminal sends a response message on the first carrier, which indicates that message 4 has been received.

[0149] Accordingly, the network device receives a response message from the terminal on the first carrier.

[0150] In one implementation, after receiving message 4 on the first carrier, the terminal can send back a response message on the first carrier. The response time (ack timing) and its indication method can reuse the ack feedback for message 4 in the four-step access procedure.

[0151] Step S505 is an optional step.

[0152] S506: Network devices enable the second carrier.

[0153] In one implementation, the network device can activate the second carrier only after receiving the above response message k, thereby achieving the effect of activating the high-frequency carrier on demand to save power.

[0154] S507: The terminal detects the SSB of the second carrier based on the SSB information of the second carrier.

[0155] In one implementation, the terminal can first check the content of the conflict resolution field in message 4 received on the first carrier, i.e., the UE contention resolution identity field, to see if it matches the content it reported in message 3. If it matches, it further checks the first field. If the first field is valid (i.e., it indicates a handover), it switches to the second carrier and detects the SSB of the second carrier according to the configuration provided in the first carrier.

[0156] S508: The terminal initiates random access on the second carrier based on the aforementioned non-contention access resources and the detected SSB of the second carrier.

[0157] Figure 5B This is a schematic diagram of a carrier switching method provided in an embodiment of this application. Figure 5B Taking the UE as an example and the network device as the network side, the UE sends message 1 (i.e., random access preamble) to the network side on the first carrier (or anchor carrier). The network side sends message 2 (i.e., random access response) to the UE on the first carrier. Message 2 includes a carrier handover indication (i.e., the first field mentioned above) and a non-contention access resource indication on the second carrier (i.e., the second field mentioned above). The UE then hands over from the first carrier to the second carrier (i.e., the non-anchor carrier or target carrier). Subsequently, the UE detects SSB and SI messages (such as SIB) on the second carrier. Then, based on the non-contention access resource and the detected information, the UE sends message 1 or message A to the network side on the second carrier. Message A is the message in the two-step access procedure. This application does not limit whether two-step or four-step access is used after the terminal handover. Optionally, after receiving message 4, the UE can send a response (ack) to the network side to enable the second carrier.

[0158] Figure 5C The behavior of the terminal is illustrated exemplarily. For example... Figure 5CAs shown, the terminal receives message 4 on the first carrier. Message 4 includes a conflict resolution field (such as the UE contention resolution identity field mentioned above). The terminal then determines whether the conflict resolution field meets a first condition, where the first condition is that the conflict resolution field is the same as the identity information uploaded by the terminal in message 3. If the conflict resolution field does not meet the first condition, the terminal re-initiates random access on the first carrier. If the conflict resolution field meets the first condition, the terminal determines whether message 4 indicates a handover. For example, the terminal can check the first field in message 4 to determine whether message 4 indicates a handover. If the terminal determines that message 4 does not indicate a carrier handover, the terminal executes subsequent procedures on the first carrier, where the subsequent procedures are those following the receipt of message 4 in the four-step access procedure. If the terminal determines that message 4 indicates a carrier handover, the terminal detects the SSB on the second carrier; the terminal initiates RA on the second carrier using non-contention access resources.

[0159] Figure 6A This is a flowchart of another communication method provided in an embodiment of this application.

[0160] This application embodiment exemplifies the use of second information to indicate the terminal's identity information, such as the second information being TC-RNTI, which is carried on message 2 of the first carrier; and the first information being carried on message 4 of the second carrier, where the first information is the first field in message 4.

[0161] In this embodiment, after receiving message 4 on the first carrier, the terminal switches to the second carrier to receive PDSCH on the second carrier and resolves contention conflicts using the TC-RNTI received on the first carrier. The TC-RNTI can be carried in message 2; that is, the terminal receives messages 2 and 4 on the first carrier and determines subsequent actions based on the content of message 2 and message 4.

[0162] The method may include some or all of the following steps:

[0163] S601: The terminal sends message 1 on the first carrier.

[0164] Accordingly, the network device receives message 1 from the terminal on the first carrier.

[0165] S602: The network device sends message 2 on the first carrier. Message 2 includes TC-RNTI.

[0166] Accordingly, the terminal receives message 2 from the network device on the first carrier.

[0167] S603: The terminal sends message 3 on the first carrier.

[0168] Accordingly, the network device receives message 3 from the terminal on the first carrier.

[0169] S604: The network device sends message 4 on the first carrier. Message 4 includes a first field, which is used to indicate carrier switching.

[0170] Accordingly, the terminal receives message 4 from the network device on the first carrier.

[0171] For example, message 4 on the first carrier includes the following indication information: UE contention resolutionidentity field, first field and fourth information, the fourth information including at least one of the following: indication of downlink TA (uplink TA) information after switching to the second carrier, configuration information of the second carrier, and initial downlink BWP configuration (or coreset#0 configuration).

[0172] S605: The terminal sends a response message on the first carrier, which indicates that message 4 has been received.

[0173] Accordingly, the network device receives a response message from the terminal on the first carrier.

[0174] Optionally, after confirming successful access on the second carrier, the terminal may send a response message (ack) to the network device. The ack is used to indicate that the terminal has successfully descrambled the PDCCH, detected the PDCCH, confirmed access on the second carrier, or successfully received the PDCCH and PDSCH.

[0175] S606: The network device scrambles the PDCCH in the second carrier based on the TC-RNTI in message 2 on the first carrier.

[0176] In one implementation, after receiving the response message, the network device may scramble the PDCCH in the second carrier based on the TC-RNTI in message 2 on the first carrier.

[0177] S607: If the terminal successfully descrambles the PDCCH on the second carrier based on the above TC-RNTI, then the access on the second carrier is confirmed to be successful.

[0178] In one implementation, the terminal can first check whether the UE contentionresolution identity field in message 4 on the first carrier matches the content reported in message 3. If they match, the terminal further checks the first field. If the first field is valid (indicating handover), the terminal switches to the second carrier and uses the TC-RNTI to detect the PDCCH and receive subsequent PDSCH according to the configuration (i.e., the fourth information mentioned above). For example, the terminal can use the TC-RNTI (which is treated as the UE's C-RNTI) sent in the RAR during message 2 on the first carrier to receive the PDCCH and PDSCH on the second carrier. If the UE successfully detects the PDCCH and PDSCH using the TC-RNTI, it indicates that the carrier handover access is successful (no need to exchange messages 3 and 4 again).

[0179] Figure 6B This is a schematic diagram of a carrier switching method provided in an embodiment of this application. Figure 6B Taking the UE as an example and the network device as the network side, the UE sends message 1 (i.e., random access preamble) to the network side on the first carrier (or anchor carrier); the network side sends message 2 (i.e., random access response) to the UE on the first carrier, which includes TC-RNTI; the UE sends message 3 to the network side on the first carrier; the network side sends message 4 to the UE on the first carrier, which includes fourth information, such as TA indication and coreset configuration of the second carrier; the UE sends ack to the network side on the first carrier; after receiving the ack, the network side can use the TC-RNTI in message 2 to scramble the PDCCH in the second carrier; the UE detects the PDCCH and PDSCH on the second carrier.

[0180] Figure 6C The behavior of the terminal is illustrated exemplarily. For example... Figure 6CAs shown, the terminal receives message 4 on the first carrier. Message 4 includes a conflict resolution field (such as the UE contention resolution identity field mentioned above). The terminal then determines whether the conflict resolution field meets a first condition, where the first condition is that the conflict resolution field is the same as the identity information uploaded by the terminal in message 3. If the conflict resolution field does not meet the first condition, the terminal re-initiates random access on the first carrier. If the conflict resolution field meets the first condition, the terminal determines whether message 4 indicates a handover. For example, the terminal can check the first field in message 4 to determine whether message 4 indicates a handover. If the terminal determines that message 4 does not indicate a carrier handover, the terminal executes subsequent procedures on the first carrier, where the subsequent procedures are those following the receipt of message 4 in the four-step access procedure. If the terminal determines that message 4 indicates a carrier handover, the terminal uses TC-RNTI to detect the PDCCH and PDSCH on the initial downlink BWP of the second carrier.

[0181] Figure 7A This is a flowchart of another communication method provided in an embodiment of this application.

[0182] This application embodiment exemplifies the following example: the second information is used to indicate the first random access preamble (or non-contention preamble), the second information is carried in message 2 on the second carrier, and the first information is the first field (or handover indication field) in message 4 on the first carrier.

[0183] In this embodiment, after receiving message 4 on the first carrier, the terminal switches to the second carrier to receive the PDSCH. Access conflicts on the second carrier are resolved using a non-contention preamble ID. In other words, after receiving message 4 on the first carrier, the terminal determines its subsequent actions based on the content of message 4.

[0184] S701: The terminal sends message 1 on the first carrier.

[0185] Accordingly, the network device receives message 1 from the terminal on the first carrier.

[0186] S702: The network device sends message 2 on the first carrier.

[0187] Accordingly, the terminal receives message 2 from the network device on the first carrier.

[0188] S703: The terminal sends message 3 on the first carrier.

[0189] Accordingly, the network device receives message 3 from the terminal on the first carrier.

[0190] The specific implementation of steps S701 to S703 above can be referred to the four-step random access process, and an example can be found here. Figure 1 Related content.

[0191] S704: The network device sends message 4 on the first carrier. Message 4 includes a first field and a second field. The first field is used to indicate carrier switching, and the second field is used to indicate a non-contention preamble.

[0192] Accordingly, the terminal receives message 4 from the network device on the first carrier.

[0193] For example, the second field can be the non-contention preamble (or the ID of the non-contention preamble) assigned to the terminal when switching to the second carrier.

[0194] For example, message 4 on the first carrier may include the following indication information: UE contentionresolution identity field and ID of the first field, fourth information and non-contention preamble, wherein the fourth information may include at least one of the following: indication of downlink TA (uplink TA) information after switching to the second carrier, configuration information of the second carrier, and initial downlink BWP configuration (or coreset#0 configuration), etc.

[0195] S705: The terminal sends a response message on the first carrier, which indicates that message 4 has been received.

[0196] Accordingly, the network device receives a response message from the terminal on the first carrier.

[0197] Step S505 is an optional step.

[0198] S706: After receiving the response message, the network device activates the second carrier.

[0199] In one implementation, the network device can activate the second carrier only after receiving this response message (ack), thereby achieving the effect of activating the high-frequency carrier on demand to save power.

[0200] S707: The network device transmits message 2 on the second carrier, which includes a third field indicating a non-contention preamble.

[0201] Accordingly, the terminal receives message 2 from the network device on the second carrier.

[0202] In one implementation, the network side can send message 2 on a second carrier after receiving this response message.

[0203] S708: If the terminal determines that the preamble indicated by the second field and the third field are the same, then it determines that the access on the second carrier has been successful.

[0204] In some embodiments, the terminal can first check whether the contentionresolution identity field in message 4 on the first carrier matches the content reported in message 3. If they match, the terminal further checks the first field. If the first field is valid (i.e., indicating a handover), the terminal switches to the second carrier and uses the random access radio network temporary identifier (RA-RNTI) to detect the PDCCH and receive subsequent PDSCHs. For example, when the network device sends message 2 on the second carrier, it places a non-contention preamble ID in the RAPID field of message 2. Then, the terminal uses RA-RNTI to detect the RAPID field in message 2 on the second carrier. If the non-contention preamble ID in this field matches the non-contention preamble ID configured in message 4 on the first carrier, it indicates that the carrier handover access is successful.

[0205] The aforementioned RA-RNTI can reuse the RA-RNTI on the first carrier, or a dedicated RNTI can be agreed upon for this handover scenario. This application does not limit the RA-RNTI.

[0206] Figure 7B This is a schematic diagram of a carrier switching method provided in an embodiment of this application. Figure 7B Taking the UE as an example and the network device as the network side, the UE sends message 1 (i.e., random access preamble) to the network side on the first carrier (or anchor carrier); the network side sends message 2 (i.e., random access response) to the UE on the first carrier; the UE sends message 3 to the network side on the first carrier; the network side sends message 4 to the UE on the first carrier, which includes a non-contention access preamble indication on the second carrier, such as a non-contention preamble ID (RAPID); the UE sends an ack to the network side on the first carrier; after receiving the ack, the network side can place the RAPID in the random access preamble identifier (RAPID) field of message 2 on the second carrier and send message 2.

[0207] Figure 7C The behavior of the terminal is illustrated exemplarily. For example... Figure 7CAs shown, the terminal receives message 4 on the first carrier. Message 4 includes a conflict resolution field (such as the UE contention resolution identity field mentioned above). The terminal then determines whether the conflict resolution field meets a first condition, where the first condition is that the conflict resolution field is the same as the identity information uploaded by the terminal in message 3. If the conflict resolution field does not meet the first condition, the terminal re-initiates random access on the first carrier. If the conflict resolution field meets the first condition, the terminal determines whether message 4 indicates a handover. For example, the terminal can check the first field in message 4 to determine whether message 4 indicates a handover. If the terminal determines that message 4 does not indicate a carrier handover, the terminal executes subsequent procedures on the first carrier, where subsequent procedures are the procedures following the receipt of message 4 in the four-step access procedure. If the terminal determines that message 4 indicates a carrier handover, the terminal receives message 2 on the second carrier. If the PAPID in message 2 on the second carrier matches the non-contention preamble indicated by message 4 on the first carrier, then access is confirmed to be successful.

[0208] For example, the specific ways in which the first information (i.e., carrier switching indication) and the configuration information of the second carrier are carried in message 4 of the first carrier include the following:

[0209] Method 1: A MAC subPDU is used to carry the switching configuration information. Its payload is used to carry the specific configuration information in each embodiment. For ease of description, this MAC subPDU can be referred to as the first MAC subPDU or the switching MAC subPDU.

[0210] by Figure 5A Taking the illustrated embodiment as an example, message 4 may include a UE contention resolution identity field and a first MAC subPDU. The UE contention resolution identity field can reuse existing fields, such as the field corresponding to LCID 62; the first MAC subPDU can be a subPDU format of a variable-length MAC CE (e.g., ...). Figure 7D As shown in Table 1, use reserved LCIDs (such as 35-46). Figure 7D These are schematic diagrams illustrating different MAC subPDU formats provided in embodiments of this application. For example... Figure 7D As shown, the first MAC subPDU may include a subheader and a field for carrying data. This field is a variable-length MAC CE, and the LCID in the subheader can be a reserved LCID (i.e., a reserved value for the LCID). Figure 7DThe application also exemplarily illustrates a fixed-length MAC subPDU (i.e., a MAC subPDU including MAC CE1) and a padding portion, which are not limited in this application; Table 11 exemplarily illustrates that the reserved value of LCID is 35-46, that is, the first MAC subPDU can use the reserved value of 35-46.

[0211] Table 1

[0212] Codepoint / index LCID values 0 CCCH 1-32 … 33 … 34 … 35-46 Reserved value

[0213] exist Figure 5A In the illustrated embodiment, after receiving message 4, the terminal can first check the UEcontention resolution identity field in message 4. If it does not match the identity information reported in message 3, it ignores other content; otherwise, it further checks other fields. If the terminal detects the presence of the aforementioned first MAC subPDU in message 4, it further reads the payload content therein to obtain the configuration information of the second carrier and performs carrier switching according to the configuration information. The configuration information may include: the second carrier SSB frequency point, the specific beam SSB indication, and the non-contention access resource indication field (i.e., Figure 5A (the second field in the text).

[0214] Method 2: Carried in the Common Common Control Channel (CCCH) of message 4. For example, as shown in Table 1, the CCCH can be LCID 0, which is distinguished at the upper layer and multiplexed in the extended field of RRC.

[0215] Method 3: Carried in SIB1 of a shared carrier. It should be understood that this excludes UE-specific configuration information, such as specific beam SSB indications (as described in the fourth section above) and non-contention-based access resource configuration information (as described above). Figure 5A (the second field in the text).

[0216] The foregoing details the method provided in this application. To facilitate the implementation of the above-described solutions in the embodiments of this application, corresponding apparatus or devices are also provided in the embodiments of this application.

[0217] This application divides network devices and terminals into functional modules based on the above-described method embodiments. For example, each function can be divided into its own functional module, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware or as a software functional module. It should be noted that the module division in this application is illustrative and represents only one logical functional division; in actual implementation, other division methods may be used. The following will combine... Figures 8 to 10 The communication device of the present application embodiment is described in detail.

[0218] See Figure 8 , Figure 8 This is a schematic diagram of the structure of a communication device provided in an embodiment of this application. Figure 8 As shown, the communication device may include a transceiver unit 10, and optionally, a processing unit 20.

[0219] In some embodiments of this application, the communication device may be a terminal as shown above, or a chip or circuit disposed in a terminal. That is, the communication device may be used to perform the steps or functions performed by the terminal in the method embodiments described above.

[0220] In one design, the transceiver unit 10 is used to: acquire first information and second information on a first carrier, wherein the first information is used to indicate carrier switching and the second information is used to indicate a first random access resource or a first random access preamble or the identity information of the terminal; and the processing unit 20 is used to: perform non-contention access on a second carrier based on the first information and the second information.

[0221] For example, the second information is used to indicate the first random access resource or the first random access preamble, and the transceiver unit 10 is specifically used to: acquire a conflict resolution message on the first carrier, the conflict resolution message including the first information and the second information.

[0222] For example, the second information is used to indicate the first random access resource, and the second information is also used to indicate the configuration information of the SSB. The processing unit 20 is specifically used to: detect the SSB on the second carrier based on the configuration information of the SSB; and initiate random access on the second carrier based on the first random access resource and the detected SSB.

[0223] Optionally, the SSB configuration information is used to indicate the SSB frequency of the second carrier.

[0224] Optionally, the configuration information of the SSB is also used to indicate the preset beam direction, and the processing unit 20 is specifically used to detect the SSB in the preset beam direction of the second carrier.

[0225] Optionally, the first random access resource includes RO resources and / or a second random access preamble.

[0226] Optionally, the first and / or second information may be carried in the first MAC sub-PDU of the conflict resolution message or the CCCH of the conflict resolution message.

[0227] For example, the second information is used to indicate the first random access preamble, and the transceiver unit 10 is specifically used to: receive the first random access response on the second carrier; the first random access response includes third information, which is used to indicate the third random access preamble; the processing unit 20 is specifically used to: determine that the access on the second carrier is successful if the first random access preamble and the third random access preamble match.

[0228] For example, the second information is used to indicate the identity information of the terminal, and the transceiver unit 10 is specifically used to: acquire a conflict resolution message on the first carrier, the conflict resolution message including the first information; and acquire a second random access response on the first carrier, the second random access response including the second information.

[0229] For example, the second information is used to indicate the identity information of the terminal, and the processing unit 20 is specifically used to: detect the PDCCH on the second carrier based on the second information; if the PDCCH is detected on the second carrier, determine that the access on the second carrier is successful.

[0230] For example, the terminal's identity information is TC-RNTI, and the conflict resolution message also includes fourth information, which is used to indicate at least one of the following: downlink timing advance TA information corresponding to the second carrier, uplink TA information corresponding to the second carrier, configuration information of the second carrier, and initial downlink BWP configuration; the processing unit 20 is specifically used to: detect PDCCH on the second carrier based on TC-RNTI and the fourth information.

[0231] Optionally, the transceiver unit 10 is further configured to: send a response message, the response message being used to indicate that the first information and / or the second information has been obtained.

[0232] In the embodiments of this application, the description of the first information and the second information, etc., can be found above. Figures 4 to 7A The descriptions in the method embodiments shown will not be repeated here.

[0233] It is understood that the specific descriptions of the transceiver unit 10 and processing unit 20 shown in the embodiments of this application are merely examples. For the specific functions or execution steps of the transceiver unit 10 and processing unit 20, please refer to the above descriptions. Figures 4 to 7A The method embodiments shown are not described in detail here. Furthermore, the technical effects of the embodiments of this application are explained in the foregoing. Figures 4 to 7A The technical effects of the method embodiments shown are not elaborated here for the sake of simplicity.

[0234] Reuse Figure 8 In some embodiments of this application, the communication device may be the network device shown above or a chip or circuit disposed in the network device. That is, the communication device may be used to perform the steps or functions performed by the network device in the method embodiments above.

[0235] In one design, the transceiver unit 10 is used to: output first information and second information on a first carrier, wherein the first information is used to indicate carrier switching and the second information is used to indicate a first random access resource or a first random access preamble or the identity information of the terminal; the first information and the second information are used to perform non-contention access on a second carrier.

[0236] For example, the second information is used to indicate the first random access resource or the first random access preamble, and the transceiver unit 10 is specifically used to: output a conflict resolution message on the first carrier, the conflict resolution message including the first information and the second information.

[0237] For example, the second information is used to indicate the first random access resource, and the second information is also used to indicate the configuration information of the SSB. The transceiver unit 10 is also used to: output the SSB on the second carrier based on the configuration information of the SSB; and obtain the random access request output by the terminal on the second carrier.

[0238] In one possible implementation, the SSB configuration information is used to indicate the SSB frequency of the second carrier.

[0239] In one possible implementation, the configuration information of the SSB is also used to indicate a preset beam direction, and the processing unit 20 is specifically used to output the SSB in the preset beam direction of the second carrier.

[0240] For example, the first random access resource includes random access timing (RO) resources and / or a second random access preamble.

[0241] Optionally, the first information and / or the second information may be carried in the first Media Access Control (MAC) sub-protocol data unit (PDU) in the conflict resolution message or the common control channel (CCCH) in the conflict resolution message.

[0242] In one implementation, the second information is used to indicate the first random access preamble, and the transceiver unit 10 is further used to: output a first random access response on the second carrier; the first random access response includes third information, which is used to indicate a third random access preamble, and the third random access preamble is related to the first random access preamble.

[0243] In one implementation, the second information is used to indicate the identity information of the terminal, and the transceiver unit 10 is specifically used to: output a conflict resolution message on the first carrier, the conflict resolution message including the first information; and output a second random access response on the first carrier, the second random access response including the second information.

[0244] Optionally, the second information is used to indicate the identity information of the terminal, and the transceiver unit 10 is also used to: output PDCCH on the second carrier based on the second information, wherein the PDCCH is used for non-contention access on the second carrier.

[0245] For example, the terminal's identity information is TC-RNTI, and the conflict resolution message also includes fourth information, which is used to indicate at least one of the following: downlink TA information corresponding to the second carrier, uplink TA information corresponding to the second carrier, configuration information of the second carrier, or initial downlink BWP configuration; wherein, TC-RNTI and the fourth information are used to detect PDCCH on the second carrier.

[0246] Optionally, the transceiver unit 10 is further configured to: acquire a response message, the response message indicating that the first information and / or the second information has been acquired; and the processing unit 20 is configured to: activate the second carrier based on the response message.

[0247] In the embodiments of this application, the description of the first information and the second information, etc., can be found above. Figures 4 to 7A The descriptions in the method embodiments shown will not be repeated here.

[0248] It is understood that the specific descriptions of the transceiver unit 10 and processing unit 20 shown in the embodiments of this application are merely examples. For the specific functions or execution steps of the transceiver unit 10 and processing unit 20, please refer to the above descriptions. Figure 4 The method embodiments shown are not described in detail here. Furthermore, the technical effects of the embodiments of this application are explained in the foregoing. Figure 4 The technical effects of the method embodiments shown are not elaborated here for the sake of simplicity.

[0249] The network devices and terminals described above represent embodiments of this application. The following describes possible product forms of the network devices and terminals. It should be understood that any network device or terminal possessing the above-described features... Figure 8 Any form of the terminal or network device described herein falls within the protection scope of the embodiments of this application. It should also be understood that the following description is merely illustrative and does not limit the product form of the communication device in the embodiments of this application to this extent.

[0250] In one possible implementation, Figure 8In the communication device shown, the processing unit 20 can be a processing circuit, and the transceiver unit 10 can be a communication circuit. The processing circuit can be one or more processors, or all or part of the control or processing circuitry within one or more processors. When the communication device is a terminal or network device, the communication circuit can be a transceiver circuit, which can be a transceiver unit. When the communication device is a chip or chip system, the communication circuit can be an interface circuit. When the communication device is a server, the communication circuit can be an interface circuit or a transceiver circuit. The transceiver unit 10 can also be a sending unit and / or a receiving unit. The sending unit can be a sending circuit, and the receiving unit can be a receiving circuit, integrated into a single device. In this embodiment, the processing circuit and the communication circuit can be coupled, etc., and the connection method between the processing circuit and the communication circuit is not limited in this embodiment. During the execution of the above method, the process of sending information in the above method can be understood as the process of the processing circuit outputting the above information. When outputting the above information, the processing circuit outputs the above information to the communication circuit for transmission. After the above information is output by the processing circuit, it may need to undergo further processing before reaching the communication circuit. Similarly, the process of receiving information in the above method can be understood as the process by which the processing circuit receives the input information. When the processing circuit receives the input information, the communication circuit receives the information and inputs it into the processing circuit. Furthermore, after the communication circuit receives the information, the information may need to undergo further processing before being input into the processing circuit.

[0251] In one possible implementation, Figure 8 In the communication device shown, the processing unit 20 can be one or more processors, and the transceiver unit 10 can be a transceiver, or the transceiver unit 10 can also be a transmitting unit and / or a receiving unit. The transmitting unit can be a transmitter, and the receiving unit can be a receiver. The transmitting unit and the receiving unit are integrated into one device, such as a transceiver. In the embodiments of this application, the processor and the transceiver can be coupled, etc., and the connection method between the processor and the transceiver is not limited in the embodiments of this application. In the process of executing the above method, the process of sending information in the above method can be understood as the process of the processor outputting the above information. When outputting the above information, the processor outputs the above information to the transceiver so that the transceiver can transmit it. After the above information is output by the processor, it may need to undergo other processing before reaching the transceiver. Similarly, the process of receiving information in the above method can be understood as the process of the processor receiving the input above information. When the processor receives the input information, the transceiver receives the above information and inputs it into the processor. Furthermore, after the transceiver receives the above information, the above information may need to undergo other processing before being input into the processor.

[0252] See Figure 9 , Figure 9 This is another structural schematic diagram of the communication device provided in the embodiments of this application. For example... Figure 9 As shown, the communication device provided in this application embodiment can be used to implement the methods described in the above method embodiments, and the description in the above method embodiments can be referred to. The communication device can be a terminal, a network device, or a chip therein. Exemplarily, the communication device includes one or more processors 1001. Optionally, the communication device may further include a memory 1003. Optionally, the communication device may further include a transceiver 1002. In one implementation, the communication device further includes an input / output device (...). Figure 9 (Not indicated).

[0253] The processor 1001 is primarily used for processing communication protocols and data, controlling the entire communication device, executing software programs, and processing software program data. The memory 1003 is primarily used for storing software programs and data. In one possible implementation, the transceiver 1002 may include control circuitry and an antenna; the transceiver may also be a communication circuit, a communication interface, an input / output interface, or chip pins. The control circuitry is primarily used for converting baseband signals to radio frequency signals and processing radio frequency signals. The antenna is primarily used for transmitting and receiving radio frequency signals in the form of electromagnetic waves. Input / output devices, such as touchscreens, displays, and keyboards, are primarily used for receiving user input data and outputting data to the user.

[0254] In one possible implementation, processor 1001 can read software programs from memory 1003, interpret and execute the instructions of the software programs, and process the data of the software programs. When data needs to be transmitted wirelessly, processor 1001 performs baseband processing on the data to be transmitted and outputs a baseband signal to the radio frequency (RF) circuit. The RF circuit then performs RF processing on the baseband signal and transmits the RF signal outward in the form of electromagnetic waves through an antenna. When data is sent to the communication device, the RF circuit receives the RF signal through the antenna, converts the RF signal into a baseband signal, and outputs the baseband signal to processor 1001. Processor 1001 converts the baseband signal into data and processes the data.

[0255] In another implementation, the radio frequency circuitry and antenna can be set up independently of the processor performing baseband processing. For example, in a distributed scenario, the radio frequency circuitry and antenna can be arranged remotely, independent of the communication device.

[0256] In one possible implementation, the processor 1001, transceiver 1002, and memory 1003 can be connected via a communication bus.

[0257] For example, when the communication device is used to perform the above... Figure 4 When the network device performs a step, method, or function in the illustrated embodiment, the transceiver 1002 can be used to perform... Figure 4 In step S401, the processor 1001 can be used to perform a process for the techniques described herein (such as generating first information).

[0258] For example, when the communication device is used to perform the above... Figure 4 In the illustrated embodiment, when the terminal executes a step, method, or function, the transceiver 1002 can be used to perform... Figure 4 In step S401, processor 1001 can be used to execute step S402, the process of other techniques described herein.

[0259] In any of the above implementations, the processor 1001 may include a transceiver for implementing receiving and transmitting functions. For example, the transceiver may be a transceiver circuit, an interface, or an interface circuit. The transceiver circuit, interface, or interface circuit for implementing receiving and transmitting functions may be separate or integrated. The aforementioned transceiver circuit, interface, or interface circuit can be used for reading and writing code / data, or it can be used for transmitting or relaying signals.

[0260] In any of the above implementations, the processor 1001 may store instructions, which may be computer programs. These computer programs, running on the processor 1001, cause the communication device to execute the methods described in the above method embodiments. The computer program may be embedded in the processor 1001; in this case, the processor 1001 may be implemented in hardware.

[0261] In one implementation, the communication device may include a circuit that can perform the functions of transmitting, receiving, or communicating in the aforementioned method embodiments. The processor and transceiver described in this application can be implemented on integrated circuits (ICs), analog ICs, radio frequency integrated circuits (RFICs), mixed-signal ICs, application-specific integrated circuits (ASICs), printed circuit boards (PCBs), electronic devices, etc. The processor and transceiver can also be manufactured using various IC process technologies, such as complementary metal-oxide semiconductors (CMOS), n-metal-oxide-semiconductor (NMOS), positive-channel metal-oxide semiconductors (PMOS), bipolar junction transistors (BJTs), bipolar CMOS (BiCMOS), silicon-germanium (SiGe), gallium arsenide (GaAs), etc.

[0262] For example, the processor described in this application may include one or more of the following: a central processing unit (CPU), an ASIC, a digital signal processor (DSP), a microprocessor unit (MPU), a microcontroller unit (MCU), a graphics processing unit (GPU), a field programmable gate array (FPGA), an artificial intelligence processor (AI processor), or a neural processing unit (NPU).

[0263] It is understood that the communication device shown in the embodiments of this application may also have more than Figure 9This application does not limit the use of other components or other related elements. The methods performed by the processor and transceiver shown above are merely examples; for the specific steps performed by the processor and transceiver, please refer to the description of the method embodiments above.

[0264] In another possible implementation, the communication device provided in this application embodiment may include one or more processors and a memory. The processor is used to execute a program stored in the memory, and when the program is executed, the method embodiment described above is performed. Exemplarily, the processor and memory may also be integrated into a single device, i.e., the processor and memory may be integrated together.

[0265] For example, the memory described in this application (e.g., memory 1003) may include, but is not limited to, cache, read-only memory (ROM), random access memory (RAM), synchronous dynamic random access memory (SDRAM), hard disk drive (HDD) or solid-state drive (SSD), erasable programmable read-only memory (EPROM), or compact disc read-only memory (CD-ROM), etc. Memory is any other medium capable of carrying or storing desired program code having an instruction or data structure form and accessible by a computer, but is not limited thereto. The memory in the embodiments of this application may also be a circuit or any other means capable of implementing storage functions for storing computer programs or instructions, and / or data.

[0266] For more detailed information on processors and memory, please refer to [link / reference]. Figure 9 The relevant information regarding the processor 1001 and memory 1003.

[0267] In another possible implementation, Figure 9 The communication device shown may further include a processing unit, which may be one or more logic circuits. The transceiver unit 10 may be an input / output interface, or a communication interface, or an interface circuit, or an interface, etc. Alternatively, the transceiver unit 10 may also be a transmitting unit and a receiving unit. The transmitting unit may be an output interface, and the receiving unit may be an input interface. The transmitting unit and the receiving unit are integrated into one unit, such as an input / output interface.

[0268] See Figure 10 , Figure 10 This is another structural schematic diagram of the communication device provided in the embodiments of this application. For example... Figure 10 As shown, Figure 10 The communication device shown includes logic circuitry 901 and interface 902. That is, the processing unit can be implemented using logic circuitry 901, and the transceiver unit 10 can be implemented using interface 902. The logic circuitry 901 can be a chip, processing circuit, integrated circuit, or system-on-chip (SoC) chip, etc., and the interface 902 can be a communication interface, input / output interface, pins, etc. For example, Figure 10 The above-mentioned communication device is used as an example of a chip, which includes a logic circuit 901 and an interface 902.

[0269] In this embodiment, the logic circuit and the interface can also be coupled to each other. The specific connection method between the logic circuit and the interface is not limited in this embodiment.

[0270] For example, when the communication device is used to perform the above... Figure 4 When the terminal executes a step, method, or function in the method embodiment shown, interface 902 is used to transmit first information and second information.

[0271] For example, when the communication device is used to perform the above... Figure 4 When the network device performs a step, method, or function in the method embodiment shown, interface 902 is used to transmit first information and second information.

[0272] In the embodiments of this application, the description of the first data, etc., can be found above. Figure 4 The method embodiments shown are described in detail here, and will not be repeated here. It is understood that for a more detailed explanation of the logic circuit 901 and interface 902, please refer to [the relevant documentation / reference needed]. Figure 8 The descriptions of the processing unit and transceiver unit shown will not be repeated here.

[0273] It is understood that the communication device shown in the embodiments of this application can implement the method provided in the embodiments of this application in hardware form or in software form, etc., and the embodiments of this application do not limit it in this way.

[0274] for Figure 10 For specific implementations of the various embodiments shown, please refer to the above embodiments, which will not be described in detail here.

[0275] This application also provides a communication system, which includes a network device and a terminal, and the network device and terminal can be used to execute any of the foregoing method embodiments. Figures 4 to 7A The method in ).

[0276] In addition, this application also provides a computer program for implementing the operations and / or processes performed by a communication device (such as the network device and terminal described above) in the method provided in this application.

[0277] This application also provides a computer-readable storage medium storing computer code that, when executed on a computer, causes the computer to perform the operations and / or processes performed by a communication device (such as the network device and terminal described above) in the method provided in this application.

[0278] This application also provides a computer program product, which includes computer code or a computer program that, when run on a computer, causes the operations and / or processes performed by a communication device (such as the network device and terminal described above) in the method provided in this application to be executed.

[0279] In the embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interfaces, devices, or units, or it may be an electrical, mechanical, or other form of connection.

[0280] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected according to actual needs to achieve the technical effects of the solutions provided in the embodiments of this application.

[0281] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0282] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to existing technology, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a readable storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned readable storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks.

[0283] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A communication method, characterized in that, Applied to a first communication device, the method includes: First information and second information are acquired on the first carrier. The first information is used to indicate carrier switching, and the second information is used to indicate the first random access resource, the first random access preamble, or the identity information of the terminal. Based on the first information and the second information, non-contention access is performed on the second carrier.

2. The method according to claim 1, characterized in that, The second information is used to indicate the first random access resource or the first random access preamble. The step of acquiring the first and second information on the first carrier includes: A conflict resolution message is acquired on the first carrier, the conflict resolution message including the first information and the second information.

3. The method according to claim 1 or 2, characterized in that, The second information is used to indicate the first random access resource, and the second information is also used to indicate the configuration information of the synchronization signal block (SSB). The step of performing non-contention-free access on the second carrier based on the first information and the second information includes: Based on the configuration information of the SSB, the SSB is detected on the second carrier; Based on the first random access resource and the detected SSB, random access is initiated on the second carrier.

4. The method according to claim 3, characterized in that, The SSB configuration information is used to indicate the SSB frequency point of the second carrier.

5. The method according to claim 4, characterized in that, The configuration information of the SSB is also used to indicate the preset beam direction. The step of detecting SSB on the second carrier includes detecting SSB in the preset beam direction of the second carrier.

6. The method according to any one of claims 1-5, characterized in that, The first random access resource includes random access timing (RO) resources and / or a second random access preamble.

7. The method according to any one of claims 1-6, characterized in that, The first information and / or the second information are carried in the first Media Access Control (MAC) Sub-Protocol Data Unit (PDU) in the conflict resolution message or in the Common Control Channel (CCCH) in the conflict resolution message.

8. The method according to claim 1 or 2, characterized in that, The second information is used to indicate the first random access preamble, and the non-contention-free access on the second carrier based on the first information and the second information includes: A first random access response is acquired on the second carrier; the first random access response includes third information, which is used to indicate a third random access preamble. If the first random access preamble and the third random access preamble match, it is determined that access on the second carrier was successful.

9. The method according to claim 1, characterized in that, The second information is used to indicate the identity information of the terminal. The step of obtaining the first and second information on the first carrier includes: Acquire a conflict resolution message on the first carrier, the conflict resolution message including the first information; A second random access response is obtained on the first carrier, the second random access response including the second information.

10. The method according to claim 1 or 9, characterized in that, The second information is used to indicate the identity information of the terminal. The non-contention-free access on the second carrier based on the first information and the second information includes: Based on the second information, the physical downlink control channel (PDCCH) is detected on the second carrier; If a PDCCH is detected on the second carrier, it is determined that access on the second carrier was successful.

11. The method according to claim 10, characterized in that, The terminal's identity information is a temporary network-side identity identifier (TC-RNTI). The conflict resolution message also includes a fourth piece of information, which indicates at least one of the following: downlink timing advance (TA) information corresponding to the second carrier, uplink TA information corresponding to the second carrier, configuration information of the second carrier, and initial downlink partial bandwidth (BWP) configuration. The step of detecting PDCCH on the second carrier based on the second information includes: Based on the TC-RNTI and the fourth information, the PDCCH is detected on the second carrier.

12. The method according to any one of claims 1-11, characterized in that, The method further includes: Output a response message, which indicates that the first information and / or the second information has been obtained.

13. A communication method, characterized in that, Applied to a second communication device, the method includes: First information and second information are output on the first carrier. The first information is used to indicate carrier switching, and the second information is used to indicate the first random access resource, the first random access preamble, or the identity information of the terminal. The first information and the second information are used to perform non-contention access on the second carrier.

14. The method according to claim 13, characterized in that, The second information is used to indicate the first random access resource or the first random access preamble. The step of outputting the first and second information on the first carrier includes: Output a conflict resolution message on the first carrier, the conflict resolution message including the first information and the second information.

15. The method according to claim 13 or 14, characterized in that, The second information is used to indicate the first random access resource, and the second information is also used to indicate the configuration information of the synchronization signal block (SSB). The method further includes: Based on the configuration information of the SSB, the SSB is output on the second carrier; Obtain the random access request output by the terminal on the second carrier.

16. The method according to claim 15, characterized in that, The SSB configuration information is used to indicate the SSB frequency point of the second carrier.

17. The method according to claim 16, characterized in that, The configuration information of the SSB is also used to indicate the preset beam direction, and the method further includes: SSB is output in the preset beam direction of the second carrier.

18. The method according to any one of claims 13-17, characterized in that, The first random access resource includes random access timing (RO) resources and / or a second random access preamble.

19. The method according to any one of claims 1-18, characterized in that, The first information and / or the second information are carried in the first Media Access Control (MAC) Sub-Protocol Data Unit (PDU) in the conflict resolution message or in the Common Control Channel (CCCH) in the conflict resolution message.

20. The method according to claim 13 or 14, characterized in that, The second information is used to indicate the first random access preamble, and the method further includes: A first random access response is output on the second carrier; the first random access response includes third information, which is used to indicate a third random access preamble, which is related to the first random access preamble.

21. The method according to claim 13, characterized in that, The second information is used to indicate the identity information of the terminal. The step of outputting the first information and the second information on the first carrier includes: Output a conflict resolution message on the first carrier, the conflict resolution message including the first information; A second random access response is output on the first carrier, the second random access response including the second information.

22. The method according to claim 13 or 21, characterized in that, The second information is used to indicate the identity information of the terminal, and the method further includes: Based on the second information, a physical downlink control channel (PDCCH) is output on the second carrier, and the PDCCH is used for non-contention access on the second carrier.

23. The method according to claim 22, characterized in that, The terminal's identity information is a temporary network-side identity identifier (TC-RNTI). The conflict resolution message also includes a fourth piece of information, which is used to indicate at least one of the following: downlink timing advance (TA) information corresponding to the second carrier, uplink TA information corresponding to the second carrier, configuration information of the second carrier, or initial downlink partial bandwidth (BWP) configuration. The TC-RNTI and the fourth information are used to detect the PDCCH on the second carrier.

24. The method according to any one of claims 13-23, characterized in that, The method further includes: Obtain a response message, the response message being used to indicate that the first information and / or the second information has been obtained; Based on the response message, the second carrier is activated.

25. A communication device, characterized in that, Includes modules or units for performing the method according to any one of claims 1 to 24.

26. A communication device, characterized in that, The device includes a processor and an interface circuit, wherein the interface circuit is used to acquire signals from other communication devices and transmit them to the processor or to output signals from the processor to other communication devices, and the processor is used through logic circuits or executing code instructions to cause the communication device to implement the method as described in any one of claims 1 to 24.

27. A readable storage medium, characterized in that, Used to store computer programs or instructions, which are executed by one or more processors, causing an apparatus including the one or more processors to perform the method as described in any one of claims 1 to 24.

28. A computer program product, characterized in that, When the computer program product is run on an electronic device, it causes the electronic device to perform the method as described in any one of claims 1-24.

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