Communication method and communication device

Abstract

Provided are a communication method and a communication device, the method comprising: receiving first information, the first information comprising first configuration information and second configuration information, or the first information comprising the first configuration information and not comprising the second configuration information, the first configuration information indicating a frequency band to which a first cell belongs, the second configuration information indicates that the first cell supports the first communication mode; determining whether the first cell is prohibited or not based on the first condition, and prohibiting the first cell under the condition that the first condition is not met; wherein the first condition comprises that under the condition that the first information does not comprise the second configuration information, the terminal equipment supports the second communication mode on the first frequency band; or the first information comprises second configuration information; the frequency band to which the first cell belongs comprises a first frequency band, and the first communication mode is different from the second communication mode. Therefore, the problem that the communication mode supported by the first cell and the terminal equipment is not matched can be avoided, and the working reliability of the terminal equipment can be improved.

Description

Communication method and communication device

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on August 11, 2023, with application number 202311021314.5 and application name “A Communication Method and Communication Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communication technology, and more particularly, to a communication method and a communication device. Background Art

[0003] To reduce the cost of terminal devices, reduced-capability terminal devices, such as reduced-capability UE (RedCap UE), have been introduced. These reduced-capability terminal devices can support half-duplex frequency division duplexing (HD-FDD) mode. In other words, these terminal devices do not support simultaneous reception and transmission on different frequencies, reducing the implementation complexity of the terminal device and, compared to full-duplex frequency division duplexing (FD-FDD) mode, lowering costs.

[0004] Terminal devices may have different communication mode capabilities on different frequencies. For example, a terminal device may only support HD-FDD on some frequencies but not only HD-FDD on others. However, currently, when terminal devices select a cell, this is not taken into account, resulting in a mismatch between the cell capabilities and the terminal device's capabilities, and the terminal device cannot operate.

[0005] Summary of the Invention

[0006] The present application provides a communication method and a communication device, which can improve the reliability of terminal equipment operation.

[0007] In a first aspect, a communication method is provided, which can be executed by a terminal device or a chip in the terminal device, the method comprising: receiving first information, the first information including first configuration information and second configuration information, or the first information including the first configuration information but not including the second configuration information, wherein the first configuration information indicates the frequency band to which the first cell belongs, and the second configuration information indicates that the first cell supports a first communication mode; determining whether the first cell is prohibited or not prohibited based on a first condition, and if the first condition is not met, the first cell is prohibited; wherein the first condition comprises: when the first information does not include the second configuration information, the terminal device supports the second communication mode on the first frequency band; or the first information includes the second configuration information; wherein the frequency band to which the first cell belongs includes the first frequency band, and the first communication mode and the second communication mode are different.

[0008] Based on the present technical solution, the terminal device takes into account the ability of the terminal device to support a communication mode on the frequency band in the conditions for determining whether the first cell is prohibited, thereby avoiding the problem of mismatch between the communication mode supported by the first cell and the communication mode supported by the terminal device on the first frequency band on the first frequency band, avoiding the problem of inability to communicate due to mismatch between the capabilities of the terminal device and the capabilities of the cell, and improving the reliability of the terminal device's operation.

[0009] In a second aspect, a communication method is provided, which can be executed by a network device or a chip in the network device, the method comprising: sending first information, the first information including first configuration information and second configuration information, or the first information including the first configuration information but not including the second configuration information, wherein the first configuration information indicates the frequency band to which the first cell belongs, and the second configuration information indicates that the first cell supports a first communication mode; wherein, if a first condition is not met, the first cell is prohibited, the first condition comprising: when the first information does not include the second configuration information, the terminal device supports the second communication mode on the first frequency band; or the first information includes the second configuration information; wherein the frequency band to which the first cell belongs includes the first frequency band, and the first communication mode and the second communication mode are different.

[0010] Regarding the beneficial technical effects of various implementation methods of the second aspect, please refer to the description of the relevant implementation methods of the first aspect and will not be repeated here.

[0011] In combination with the first aspect or the second aspect, in some implementations, the first communication mode is half-duplex frequency division duplex HD-FDD.

[0012] In combination with the first aspect or the second aspect, in some implementations, the first condition also includes one or more of the following: the first frequency band is a frequency division duplex FDD band; the terminal device supports the transmission requirements of the first frequency band; the terminal device supports a first uplink channel bandwidth, and the maximum transmission bandwidth of the first uplink channel bandwidth is less than or equal to the carrier bandwidth, and greater than or equal to the bandwidth of the initial uplink bandwidth part BWP; the terminal device supports a first downlink channel bandwidth, and the maximum transmission bandwidth of the first downlink channel bandwidth is less than or equal to the carrier bandwidth, and greater than or equal to the bandwidth of the initial downlink BWP; the terminal device is enabled for frequency-shifted uplink transmission, and the terminal device supports frequency offset on the first frequency band, or the terminal device is not enabled for frequency-shifted uplink transmission.

[0013] Based on this technical solution, the terminal device can judge multiple conditions to determine whether the first cell is prohibited, thereby further improving the reliability of the terminal device.

[0014] In combination with the first aspect or the second aspect, in some implementations, when the first condition is met, the first frequency band in the frequency band to which the first cell belongs that meets the second condition is selected, and the second condition includes at least one of the following: when the first information does not include the second configuration information, the second communication mode is supported.

[0015] Based on this technical solution, the terminal device selects a bandwidth that meets the second condition, thereby avoiding selecting a bandwidth that does not match the capabilities of the terminal device and the first cell, and can improve the reliability of the terminal device's operation.

[0016] In combination with the first aspect or the second aspect, in some implementations, the second condition further includes one or more of the following: supporting transmission requirements; and supporting frequency offset in the case of uplink transmission with frequency offset enabled.

[0017] In combination with the first aspect or the second aspect, in some implementations, the method also includes: when a third condition is met, determining that the first cell is configured with a supplementary uplink carrier SUL; wherein the third condition includes: when the first information does not include the second configuration information, the terminal device supports a third communication mode on the second frequency band; the first information includes the second configuration information; wherein the frequency band to which the first cell SUL belongs includes the second frequency band, and the first communication mode and the third communication mode are different.

[0018] Based on the embodiments of the present application, when the terminal device determines whether the first cell is configured with SUL, it may also take into account the capabilities of the communication mode supported by the frequency band to which the first cell SUL belongs, thereby avoiding the problem of mismatch between the terminal device and the capabilities of the first cell on the frequency band to which the first cell SUL belongs, and further improving the reliability of the terminal device.

[0019] In combination with the first aspect or the second aspect, in some implementations, the third condition also includes one or more of the following: the second frequency band is included in the SUL frequency band list supported by the terminal device; the terminal device supports the transmission requirements of the second frequency band; the terminal device supports the second uplink channel bandwidth, and the maximum transmission bandwidth of the second uplink channel bandwidth is less than or equal to the SUL carrier bandwidth and greater than or equal to the bandwidth of the SUL initial uplink BWP; the terminal device is enabled for frequency-shifted uplink transmission, and the terminal device supports frequency offset on the second frequency band, or the terminal device is not enabled for frequency-shifted uplink transmission.

[0020] In combination with the first aspect or the second aspect, in some implementations, when the third condition is met, the first frequency band in the SUL frequency band to which the first cell belongs that meets the fourth condition is selected, and the fourth condition includes: when the first information does not include the second configuration information, supporting the second communication mode.

[0021] In combination with the first aspect or the second aspect, in some implementations, the fourth condition further includes one or more of the following: supporting transmission requirements; supporting frequency offset in the case of uplink transmission with frequency offset enabled for SUL.

[0022] According to a third aspect, a communication method is provided, which can be executed by a terminal device or a chip in the terminal device, and the method includes: receiving first information, the first information includes first configuration information and second configuration information, or the first information includes the first configuration information but does not include the second configuration information, wherein the first configuration information indicates N frequency bands to which the first cell belongs, and the second configuration information indicates that the first cell supports a first communication mode, and N is a positive integer; determining that the first cell is prohibited based on a fifth condition, and when the fifth condition is met, the first cell is prohibited; wherein the fifth condition includes: when the first information does not include the second configuration information, the terminal device supports the first communication mode on N frequency bands but does not support the second communication mode, and the first communication mode and the second communication mode are different.

[0023] Based on this technical solution, the terminal device takes into account the ability of the terminal device to support communication modes on N frequency bands in the conditions for determining whether the first cell is prohibited, thereby avoiding the problem of mismatch between the communication mode supported by the first cell and the communication mode supported by the terminal device on the selected frequency band, and improving the reliability of the terminal device.

[0024] In a fourth aspect, a communication method is provided, which can be executed by a network device or a chip in the network device, the method comprising: sending first information, the first information including first configuration information and second configuration information, or the first information including the first configuration information but not including the second configuration information, wherein the first configuration information indicates the N frequency bands to which the first cell belongs, and the second configuration information indicates that the first cell supports a first communication mode, and N is a positive integer; wherein, when the fifth condition is met, the first cell is prohibited, and the fifth condition comprises: when the first information does not include the second configuration information, the terminal device supports the first communication mode on N frequency bands but does not support the second communication mode, and the first communication mode and the second communication mode are different.

[0025] Regarding the beneficial technical effects of various implementation methods of the fourth aspect, please refer to the description of the relevant implementation methods of the first aspect and will not be repeated here.

[0026] In combination with the third aspect or the fourth aspect, in certain implementations, the N frequency bands include a normal uplink carrier NUL frequency band and an auxiliary uplink carrier NUL frequency band.

[0027] In a fifth aspect, a communication method is provided, which can be executed by a terminal device or a chip in the terminal device, and the method includes: sending capability information, where the capability information is used to indicate whether the terminal device supports or does not support half-duplex frequency division duplex HD-FDD on a first frequency band pair, and the first frequency band pair includes a frequency band for a supplementary uplink carrier and a frequency band for a downlink carrier.

[0028] Based on this technical solution, by stipulating that the terminal device reports the SUL support for HD-FDD specifically in the downlink frequency band, it is possible to indicate the SUL support for HD-FDD in a more flexible and fine-grained manner.

[0029] In a sixth aspect, a communication method is provided, which can be executed by a network device or a chip in the network device, the method including: receiving capability information, the capability information being used to indicate whether the terminal device supports or does not support half-duplex frequency division duplex HD-FDD on a first frequency band pair, the first frequency band pair including a frequency band for a supplementary uplink carrier and a frequency band for a downlink carrier.

[0030] Regarding the beneficial technical effects of various implementation methods of the sixth aspect, please refer to the description of the relevant implementation methods of the first aspect and will not be repeated here.

[0031] In combination with the fifth aspect or the sixth aspect, in some implementations, the supplementary uplink frequency band is a supplementary uplink frequency band supported by the terminal device, and the downlink carrier frequency band is a downlink carrier frequency band supported by the terminal device.

[0032] In the seventh aspect, a communication device is provided, which includes a transceiver unit and a processing unit, wherein the transceiver unit is used to receive first information, the first information includes first configuration information and second configuration information, or the first information includes the first configuration information but does not include the second configuration information, wherein the first configuration information indicates the frequency band to which the first cell belongs, and the second configuration information indicates that the first cell supports a first communication mode; the processing unit is used to determine whether the first cell is prohibited or not prohibited based on a first condition, and when the first condition is not met, the first cell is prohibited; wherein the first condition includes: when the first information does not include the second configuration information, the terminal device supports the second communication mode on the first frequency band; or the first information includes the second configuration information; wherein the frequency band to which the first cell belongs includes the first frequency band, and the first communication mode and the second communication mode are different.

[0033] Regarding the various implementation methods of the seventh aspect and the beneficial technical effects of the various implementation methods, please refer to the description of the relevant implementation methods of the first aspect and will not be repeated here.

[0034] In an eighth aspect, a communication device is provided, which includes a transceiver unit and a processing unit, wherein the processing unit is used to generate first information; the transceiver unit is used to send the first information, the first information includes first configuration information and second configuration information, or the first information includes the first configuration information but does not include the second configuration information, wherein the first configuration information indicates the frequency band to which the first cell belongs, and the second configuration information indicates that the first cell supports the first communication mode; wherein, if the first condition is not met, the first cell is prohibited, and the first condition includes: when the first information does not include the second configuration information, the terminal device supports the second communication mode on the first frequency band; or the first information includes the second configuration information; wherein the frequency band to which the first cell belongs includes the first frequency band, and the first communication mode and the second communication mode are different.

[0035] Regarding the various implementation methods of the eighth aspect and the beneficial technical effects of the various implementation methods, please refer to the description of the relevant implementation methods of the first aspect and will not be repeated here.

[0036] In the ninth aspect, a communication device is provided, which includes a transceiver unit and a processing unit, wherein the transceiver unit is used to receive first information, the first information includes first configuration information and second configuration information, or the first information includes the first configuration information but does not include the second configuration information, wherein the first configuration information indicates N frequency bands to which the first cell belongs, and the second configuration information indicates that the first cell supports a first communication mode, and N is a positive integer; the processing unit is used to determine that the first cell is prohibited based on a fifth condition, and when the fifth condition is met, the first cell is prohibited; wherein the fifth condition includes: when the first information does not include the second configuration information, the terminal device supports the first communication mode on N frequency bands but does not support the second communication mode, and the first communication mode and the second communication mode are different.

[0037] Regarding the various implementation methods of the ninth aspect and the beneficial technical effects of the various implementation methods, please refer to the description of the relevant implementation methods of the third aspect and will not be repeated here.

[0038] In the tenth aspect, a communication device is provided, which includes a transceiver unit and a processing unit, wherein the processing unit is used to generate first information; the transceiver unit is used to send the first information, the first information includes first configuration information and second configuration information, or the first information includes the first configuration information but does not include the second configuration information, wherein the first configuration information indicates N frequency bands to which the first cell belongs, and the second configuration information indicates that the first cell supports a first communication mode, and N is a positive integer; wherein, when the fifth condition is met, the first cell is prohibited, and the fifth condition includes: when the first information does not include the second configuration information, the terminal device supports the first communication mode on N frequency bands but does not support the second communication mode, and the first communication mode and the second communication mode are different.

[0039] Regarding the various implementation methods of the tenth aspect and the beneficial technical effects of various implementation methods, please refer to the description of the relevant implementation methods of the third aspect and will not be repeated here.

[0040] In the eleventh aspect, a communication device is provided, which includes a transceiver unit and a processing unit, wherein the processing unit is used to generate capability information; the transceiver unit is used to send capability information, and the capability information is used to indicate whether the terminal device supports or does not support half-duplex frequency division duplex HD-FDD on a first frequency band pair, and the first frequency band pair includes a frequency band for a supplementary uplink carrier and a frequency band for a downlink carrier.

[0041] Regarding the various implementation methods of the eleventh aspect and the beneficial technical effects of the various implementation methods, please refer to the description of the relevant implementation methods of the fifth aspect and will not be repeated here.

[0042] In the twelfth aspect, a communication device is provided, which includes a transceiver unit and a processing unit, wherein the transceiver unit is used to receive capability information, and the capability information is used to indicate whether the terminal device supports or does not support half-duplex frequency division duplex HD-FDD on a first frequency band pair, and the first frequency band pair includes a frequency band for a supplementary uplink carrier and a frequency band for a downlink carrier.

[0043] Regarding the various implementation methods of the twelfth aspect and the beneficial technical effects of the various implementation methods, please refer to the description of the relevant implementation methods of the fifth aspect and will not be repeated here.

[0044] In a thirteenth aspect, a communication device is provided, wherein the communication device has the function of implementing the method of any one of the first, third, or fifth aspects, or any possible implementation of the first, third, or fifth aspects. The function can be implemented by hardware, or by hardware executing corresponding software implementation. The hardware or software includes one or more units or modules corresponding to the above-mentioned functions.

[0045] In a fourteenth aspect, a communication device is provided, wherein the communication device has the function of implementing the method of the second aspect, the fourth aspect, or the sixth aspect, or any possible implementation of the second aspect, the fourth aspect, or the sixth aspect. The function can be implemented by hardware or by hardware executing corresponding software implementation. The hardware or software includes one or more units or modules corresponding to the above-mentioned functions.

[0046] In a fifteenth aspect, a communication device is provided, comprising a processor and a memory. Optionally, a transceiver is further provided. The memory is configured to store a computer program, and the processor is configured to call and execute the computer program stored in the memory and control the transceiver to transmit and receive signals, so that the communication device performs the method of the first aspect, the third aspect, or the fifth aspect, or any possible implementation of any of the first, third, or fifth aspects.

[0047] Exemplarily, the communication device is a terminal device or a chip used in a terminal device.

[0048] In a sixteenth aspect, a communication device is provided, comprising a processor and a memory. Optionally, the device may further comprise a transceiver. The memory is configured to store a computer program, and the processor is configured to call and execute the computer program stored in the memory, and control the transceiver to transmit and receive signals, so that the communication device performs the method of the second aspect, the fourth aspect, or the sixth aspect, or any possible implementation of any of the second, fourth, or sixth aspects.

[0049] Exemplarily, the communication device is a network device or a chip used in a network device.

[0050] In the seventeenth aspect, a communication device is provided, comprising a processor and a communication interface, wherein the communication interface is used to receive data and / or information and transmit the received data and / or information to the processor, and the processor processes the data and / or information, and the communication interface is also used to output the data and / or information processed by the processor, so that the method in any possible implementation of the first aspect, the third aspect or the fifth aspect, or any aspect of the first aspect, the third aspect or the fifth aspect is executed.

[0051] Exemplarily, the communication device is a terminal device or a chip used in a terminal device.

[0052] In aspect 18, a communication device is provided, comprising a processor and a communication interface, wherein the communication interface is used to receive data and / or information and transmit the received data and / or information to the processor, and the processor processes the data and / or information, and the communication interface is also used to output the data and / or information processed by the processor, so that the method in any possible implementation of aspect 2, aspect 4 or aspect 6, or any aspect of aspect 2, aspect 4 or aspect 6 is executed.

[0053] Exemplarily, the communication device is a network device or a chip used in a network device.

[0054] In the nineteenth aspect, a computer-readable storage medium is provided, in which computer instructions are stored. When the computer instructions are run on a computer, the method in any one of the first to second aspects, or any possible implementation of any one of these aspects, is executed.

[0055] In the twentieth aspect, a computer program product is provided, which includes a computer program code, and when the computer program code is run on a computer, the method in any aspect from the first to the sixth aspect, or any possible implementation of any aspect of these aspects, is executed.

[0056] In aspect 21, a communication system is provided, comprising the communication device as described in aspect 13 and the communication device as described in aspect 14.

[0057] In aspect 22, a communication system is provided, comprising a communication device as described in any one or more of aspects 13 to 20, or a communication device in any possible implementation of any of these aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] FIG1 is a schematic architecture diagram of a communication system provided in an embodiment of the present application;

[0059] FIG2 is a schematic diagram of an HD-FDD working mode;

[0060] FIG3 is a schematic flow chart of a communication method provided in an embodiment of the present application;

[0061] FIG4 is a schematic flow chart of another communication method provided in an embodiment of the present application;

[0062] 5 to 7 are schematic diagrams of possible communication devices provided in embodiments of the present application. DETAILED DESCRIPTION

[0063] The technical solution in this application will be described below with reference to the accompanying drawings.

[0064] The technical solutions of the embodiments of the present application can be applied to various communication systems, for example, fifth generation (5G), new radio (NR), long term evolution (LTE), Internet of Things (IoT), wireless fidelity (WiFi), wireless communications related to the 3rd Generation Partnership Project (3GPP), or other wireless communications that may appear in the future.

[0065] Figure 1 is a schematic diagram of a communication system provided by an embodiment of the present application. Communication system 100 includes at least one network device, such as network device 110 shown in Figure 1 ; communication system 100 may also include at least one terminal device, such as terminal device 120 and / or terminal device 130 shown in Figure 1 . Network device 110 and terminal devices 120 / 130 can communicate via wireless links and exchange information. It is understood that network devices and terminal devices may also be referred to as communication devices.

[0066] A network device is a network-side device with wireless transceiver functions. A network device may be a device in a radio access network (RAN) that provides wireless communication functions for terminal devices, and is referred to as a RAN device. For example, the network device may be a base station, an evolved NodeB (eNodeB), a next-generation NodeB (gNB) in a 5G mobile communication system, a base station that has been subsequently evolved by 3GPP, a transmission reception point (TRP), an access node in a WiFi system, a wireless relay node, a wireless backhaul node, etc. In communication systems using different radio access technologies (RATs), the names of devices with base station functions may vary. For example, in an LTE system, it may be called an eNB or eNodeB, and in a 5G system or NR system, it may be called a gNB. This application does not limit the specific name of the base station. A network device may include one or more co-located or non-co-located transmission and reception points. For another example, a network device may include one or more centralized units (CUs), one or more distributed units (DUs), or one or more CUs and one or more DUs. Exemplarily, the functions of the CU can be implemented by one entity or different entities. For example, the functions of the CU are further divided, that is, the control plane and the user plane are separated and implemented through different entities, namely the control plane CU entity (i.e., CU-CP entity) and the user plane CU entity (i.e., CU-UP entity). The CU-CP entity and the CU-UP entity can be coupled with the DU to jointly complete the functions of the access network device. For example, the CU is responsible for processing non-real-time protocols and services, and implementing the functions of the radio resource control (RRC) and packet data convergence protocol (PDCP) layers. The DU is responsible for processing physical layer protocols and real-time services, and implementing the functions of the radio link control (RLC) layer, the media access control (MAC) layer, and the physical (PHY) layer. In this way, some functions of the wireless access network device can be implemented through multiple network function entities. These network function entities can be network elements in hardware devices, or they can be software functions running on dedicated hardware, or virtualized functions instantiated on a platform (e.g., a cloud platform). The network device may also include an active antenna unit (AAU).AAU implements some physical layer processing functions, radio frequency processing and related functions of active antennas. Since the information of the RRC layer will eventually become the information of the PHY layer, or be converted from the information of the PHY layer, under this architecture, high-level signaling, such as RRC layer signaling, can also be considered to be sent by DU, or sent by DU+AAU. It can be understood that the network device can be a device including one or more of the CU node, DU node, and AAU node. In addition, the CU can be divided into a network device in the access network (radio access network, RAN), or the CU can be divided into a network device in the core network (core network, CN), and this application does not limit this. For example, in the vehicle to everything (V2X) technology, the access network device can be a road side unit (RSU). Multiple access network devices in the communication system can be base stations of the same type or different types. The base station can communicate with the terminal device, or it can communicate with the terminal device through a relay station. In the embodiments of the present application, the apparatus for implementing the network device function may be the network device itself, or may be an apparatus capable of supporting the network device in implementing the function, such as a chip system or a combination of devices or components capable of implementing the access network device function, which may be installed in the network device. In the embodiments of the present application, the chip system may be composed of a chip or may include a chip and other discrete components.

[0067] A terminal device is a user-side device with wireless transceiver capabilities. It can be a fixed device, mobile device, handheld device (such as a mobile phone), wearable device, in-vehicle device, or a wireless device built into any of the above devices (such as a communication module, modem, or chip system). Terminal devices are used to connect people, objects, and machines, and can be used in a wide range of scenarios, such as cellular communications, device-to-device (D2D) communications, vehicle-to-everything (V2X) communications, machine-to-machine / machine-type communications (M2M / MTC) communications, the Internet of Things (IoT), virtual reality (VR), augmented reality (AR), industrial control, self-driving, remote medical care, smart grids, smart furniture, smart offices, smart wearables, smart transportation, smart cities, drones, robots, and other scenarios. Exemplarily, the terminal device may be a handheld terminal in cellular communication, a communication device in D2D, an IoT device in MTC, a surveillance camera in intelligent transportation and smart cities, or a communication device on a drone, etc. The terminal device may sometimes be referred to as user equipment (UE), user terminal, user device, user unit, user station, terminal, access terminal, access station, UE station, remote station, mobile device or wireless communication device, etc. In the embodiment of the present application, the device for realizing the function of the terminal device may be the terminal device, or may be a device that can support the terminal device to realize the function, such as a chip system or a combination device or component that can realize the function of the terminal device, and the device may be installed in the terminal device.

[0068] To facilitate understanding of the embodiments of the present application, the concepts and related processes involved in the present application are first introduced.

[0069] 1. Reduced capability UE (RedCap UE)

[0070] RedCap UEs are terminals with reduced capabilities, lower than those supporting enhanced mobile broadband (eMBB) and ultra-reliable and low latency communication (URLLC). For example, RedCap UEs may reduce the complexity of the following features: reduced maximum bandwidth, fewer transmit and receive antennas / antenna branches, a reduced maximum number of multiple input multiple output (MIMO) layers, a reduced maximum modulation order, support for half-duplex frequency division duplexing (FDD), and so on.

[0071] 2. System Information (SI)

[0072] System information is a message sent by the base station that contains information required for UE initialization and related information of some other functions / features. System information is divided into minimum system information (Minimum SI) and other system information (Other SI).

[0073] The minimum system information consists of the master information block (MIB) and system information block 1 (SIB1). SIB1 is also called the remaining minimum system information (RMSI). The MIB is broadcast periodically on the broadcast channel (BCH). SIB1 is broadcast periodically on the downlink shared channel (DL-SCH) or sent to RRC_CONNECTED UEs via dedicated signaling.

[0074] Other system information consists of other SIBs, such as SIB2 to SIB9. Other SIBs are broadcast on the DL-SCH periodically, on-demand (i.e., the network broadcasts a SIB only when a UE in RRC idle state (RRC_IDLE) or RRC inactive state (RRC_INACTIVE) requests it, and otherwise does not send the SIB), or are sent to RRC connected UEs via dedicated signaling.

[0075] 3. Cell bar mechanism

[0076] It is an access control mechanism. In NR, the network sends a cell barring indication field (cellBarred) in the master information block MIB, which is used to indicate whether the current cell is barred or not barred. If a cell is barred, the UE in RRC idle state, RRC inactive state, and performing RRC reestablishment process cannot camp on the cell, and the cell will no longer be used as a candidate cell for cell reselection within a certain period of time. In addition to the cell barring indication field in the MIB, the terminal device can also determine whether the cell status is barred or not barred based on other conditions. For example, the RedCap UE can also determine the barring status of the cell based on the cell barring indication field of the RedCap UE in SIB1.

[0077] 4. Frequency Division Duplex (FDD)

[0078] Different frequencies are used to distinguish uplink and downlink data transmission. Uplink data and downlink data can be transmitted on two different frequency bands. For the transmitting party, receiving data and sending data on different frequencies.

[0079] 5. Time Division Duplex

[0080] Time (e.g., different time slots) is used to distinguish uplink and downlink transmissions. Uplink data and downlink data can be transmitted at different times. For the transmitting party, data is received and sent at different times.

[0081] 6. Communication mode: simplex, half-duplex and full-duplex

[0082] Simplex: refers to a working mode in which data can only be sent in one direction, and the data stream can only be sent from one party to another.

[0083] Half-duplex: refers to a transmission mode that can transmit data in both directions, but one party cannot receive and send data at the same time. Half-duplex transmission can be further divided into TDD half-duplex and FDD half-duplex:

[0084] TDD half-duplex: Only one of the upstream and downstream data streams can be transmitted at a given time. This means that one party sends and receives data at the same frequency but at different times.

[0085] Half-duplex FDD (HD-FDD): Uplink and downlink data streams are transmitted at different frequencies and times. This means that one party sends and receives data at different frequencies and times.

[0086] For example, referring to Figure 2, which is a schematic diagram of an HD-FDD operating mode, at time T1, the network device sends a data stream to the terminal device on frequency band 1, and at time T2, the terminal device sends a data stream to the network device on frequency band 2. Time T1 and time T2 are different times, and frequency band 1 and frequency band 2 are different frequency bands.

[0087] Full-duplex: refers to a transmission mode that can transmit data in both directions, with one party receiving and sending data at the same time. Full-duplex mode includes frequency division half-duplex mode.

[0088] FDD full-duplex (FD-FDD): Uplink data and downlink data are transmitted simultaneously on different frequencies, that is, one communicating party sends and transmits data simultaneously on different frequencies.

[0089] In order to facilitate understanding of the embodiments of the present application, the following first briefly describes the process and method for an existing terminal device to determine the barring status of a cell and select a frequency band. Currently, the cell broadcasts SIB1. After receiving SIB1, the UE uses the half-duplex support field (halfDuplexRedCap-Allowed) and the UE capability to determine whether the cell is barred. Among them, if SIB1 contains the half-duplex support field, then the terminal device can determine that the cell supports HD-FDD. Conversely, if SIB1 does not contain the half-duplex support field, then the terminal device can determine that the cell does not support HD-FDD. If the terminal device determines (1) that the half-duplex support field does not appear, and (2) the UE only supports the HD-FDD communication mode. Then the terminal device determines that the cell is barred and determines whether the intra-frequency cell is barred based on the intra-frequency reselection field (intraFreqReselectionRedCap).

[0090] It can be seen that if the above (1) and (2) are not satisfied, the terminal device may execute the subsequent frequency band selection process, usually selecting the first frequency band supported by the UE and supporting at least one corresponding transmission requirement in the FDD uplink frequency band list (frequencyBandList) or the TDD downlink frequency band list (frequencyBandList). The UE supports the transmission requirement can be understood as the additional frequency transmission requirement (additionalSpectrumEmission) in the maximum power list (NR-NS-PmaxList) corresponding to the frequency band supported by the UE. In addition, if the cell is configured with a supplementary uplink carrier (SUL), the terminal device can also select the frequency band on the SUL. The frequency band selection on the SUL is similar to the frequency band selection conditions on the normal uplink carrier (NUL), which will not be repeated here.

[0091] However, the UE may have different capabilities to support communication modes on different frequency bands. For example, the UE only supports HD-FDD on frequency band #1, and supports more than HD-FDD on frequency band #2 (for example, the UE supports FD-FDD on frequency band #2). In this case, even if the half-duplex support field does not appear, that is, the cell does not support HD-FDD, since the above condition (2) is not met, the terminal device may not determine that the cell is prohibited, and subsequently select frequency band #1. It can be seen that the terminal device and the cell do not support HD-FDD on frequency band #1, and one only supports HD-FDD, resulting in the terminal device being unable to work. For example, the following problem scenarios may occur:

[0092] Problem scenario 1:

[0093] As shown in Table 1, the cell does not support HD-FDD, and the UE only supports FD-FDD on bands that the cell does not support (even if the cell only supports HD-FDD on supported bands). This causes the "UE only supports HD-FDD operation" condition to fail. The UE does not consider the cell barred and proceeds with subsequent operations. Ultimately, a band is selected according to the subsequent process, but because the cell does not support HD-FDD, the UE cannot operate on this band and is unable to perform HD-FDD. A cell-supported band can also be understood as the band to which the cell belongs, that is, the band that appears in the cell's frequency band list.

[0094] Table 1:

[0095] Problem scenario 2:

[0096] As shown in Table 2, the cell does not support HD-FDD. The UE supports HD-FDD on some supported bands but not on others. This causes the "UE only supports HD-FDD operation" condition to fail. The UE does not consider the cell barred and proceeds with subsequent operations. Ultimately, a band is selected according to the subsequent process. However, because the cell does not support HD-FDD, the UE cannot operate on this band and is unable to perform HD-FDD operations.

[0097] Table 2:

[0098] Problem scenario 3:

[0099] As shown in Table 3, the cell is configured with both NUL and SUL. The UE supports FD-FDD on the NUL band but only HD-FDD on the SUL band. Therefore, the "UE only supports HD-FDD operation" condition is not met. The UE does not consider the cell barred and proceeds with subsequent operations. Ultimately, a SUL band is selected according to the subsequent process. However, because the cell does not support HD-FDD, the UE cannot perform HD-FDD on this band and cannot operate.

[0100] The present invention provides a communication method and a communication apparatus, wherein a terminal device considers the capabilities of supported communication modes on a frequency band when determining whether a cell is barred, thereby improving the reliability of the terminal device.

[0101] FIG3 is a schematic flowchart of a communication method provided in an embodiment of the present application.

[0102] S310: The terminal device receives first information from the network device. Correspondingly, the network device sends the first information to the terminal device.

[0103] The first information includes first configuration information and second configuration information, or the first information includes the first configuration information but does not include the second configuration information, wherein the first configuration information indicates the frequency band to which the first cell belongs, and the second configuration information indicates that the first cell supports the first communication mode.

[0104] That is, the first information can be used to determine whether the first cell supports the first communication mode. If the first information includes the second configuration information, the first cell supports the first communication mode; if the first information does not include the second configuration information, the first cell does not support the first communication mode.

[0105] In some implementations, the communication mode is a duplex mode, and the first communication mode is half-duplex frequency division duplex (HD-FDD).

[0106] Exemplarily, the first information may be SI, such as SIB1 in SI. The first configuration information may be a frequency band list (frequencyBandList) in the first information. The frequency band to which the first cell belongs may be understood as a frequency band supported by the first cell, or may be understood as a frequency band included in the frequency band list of the first cell. The second configuration information may be a half-duplex support field. When the first information includes a half-duplex support field, the terminal device may consider that the first cell supports HD-FDD; when the first information does not include a half-duplex support field, the terminal device may consider that the first cell does not support HD-FDD.

[0107] It is understandable that the second configuration information may be indicated in other ways. For example, if the second configuration information indicates a first value, it indicates that the first cell supports the first communication mode; if the second configuration information indicates a second value, it indicates that the first cell does not support the first communication mode. In this case, if the first information includes the second configuration information, it can be replaced by the second configuration information indicating the first value; if the first information does not include the second configuration information, it can be replaced by the second configuration information indicating the second value.

[0108] In some implementations, the network device may broadcast first information, so that a terminal device that receives the first information may determine whether the first cell supports HD-FDD based on the first information. The fact that the first cell supports HD-FDD may mean that the frequency band to which the first cell belongs supports HD-FDD.

[0109] It is understandable that when the first information does not include the second configuration information, the first cell does not support the first communication mode, and the first cell may support other communication modes, such as the second communication mode. The second communication mode is a communication mode different from the first communication mode, for example, the second communication mode may be FD-FDD. For example, if SIB1 does not include a half-duplex support field, the terminal device may assume that the first cell does not support HD-FDD but supports FD-FDD. This application does not specifically limit this.

[0110] Optionally, the terminal device may be a RedCap UE.

[0111] S320: The terminal device determines whether the first cell is prohibited or not prohibited based on the first condition.

[0112] The following describes the situation where the first cell is prohibited:

[0113] In case the first condition is not satisfied, the first cell is barred.

[0114] The first condition includes: when the first information does not include the second configuration information, the terminal device supports the second communication mode on the first frequency band (hereinafter referred to as the first condition #1), and / or the first information includes the second configuration information (hereinafter referred to as the first condition #2). The frequency band to which the first cell belongs includes the first frequency band. This condition can be subsequently recorded as the first sub-condition 1.

[0115] The terminal device supports the second communication mode on the first frequency band, which can be understood as the terminal device supporting not only the first communication mode on the first frequency band. For example, the terminal device supports other communication modes besides the first communication mode on the first frequency band. For example, the terminal device supports FD-FDD on the first frequency band, or the terminal device supports not only HD-FDD on the first frequency band.

[0116] Exemplarily, the first condition #1 includes: when the half-duplex support field is not included in SIB1, the terminal device supports FD-FDD on the frequency band of the first cell. In other words, when the half-duplex support field is not included in SIB1, the terminal device supports not only HD-FDD (for example, supports FD-FDD and HD-FDD) on the frequency band of the first cell.

[0117] Exemplarily, the first condition #2 includes: including a half-duplex support field in SIB1.

[0118] Failure to meet the first condition (or first sub-condition 1) can be understood as failing to meet either first condition #1 or first condition #2. That is, situations where the first condition is not met include: when the first information does not include the second configuration information, the terminal device only supports the first communication mode on the first frequency band. In this case, the terminal device should consider the first cell to be prohibited. For example, when the first information does not include the half-duplex support field, the terminal device only supports HD-FDD on the first frequency band.

[0119] Satisfying the first condition (or first sub-condition 1) can be understood as satisfying the first condition #1 or satisfying the first condition #2, that is, satisfying either the first condition #1 or the first condition #2. Situations in which the first condition is satisfied include: Scenario 1) The first information includes the second configuration information. Scenario 2) When the first information does not include the second configuration information, the terminal device supports the second communication mode on the first frequency band.

[0120] For example, the first condition (or first sub-condition 1) is met in the following situations: 1) SIB1 contains a half-duplex support field. 2) When SIB1 does not contain a half-duplex support field, the terminal device supports FD-FDD on the first frequency band. In this case, the terminal device should not consider the first cell as prohibited. Furthermore, the terminal device can perform subsequent conditional judgment and frequency band selection.

[0121] That is to say, if the first condition (or the first sub-condition 1) is not met, for example, when the first cell does not support HD-FDD, the terminal device only supports HD-FDD on the first frequency band (or the terminal device does not support FD-HDD on the first frequency band), the terminal device can determine that the first cell and the terminal device do not support the same communication mode on the first frequency band, thereby determining to prohibit the first cell, avoiding the terminal device from selecting the first frequency band, the first cell does not support HD-FDD on the first frequency band, and the terminal device only supports the HD-FDD band on the first frequency band, causing the terminal device to be unable to work.

[0122] The first frequency band is one or more frequency bands belonging to the first cell. It is understood that if the first condition is not met, it can be understood that all frequency bands belonging to the first cell do not meet the first condition, and the terminal device considers the first cell to be in a prohibited state; if the first condition is met, it can be understood that at least one frequency point belonging to the first cell meets the first condition.

[0123] The first cell is barred, which can be understood as the terminal device considering the first cell to be in a barred state (barred), or the terminal device excluding the first cell from candidate cells in a cell selection or cell reselection process.

[0124] Optionally, when the first condition is not met, the terminal device also considers the cell on the same frequency as the first cell to be in a prohibited state. Alternatively, when the first condition is not met, the terminal device considers the first cell to be in a prohibited state and uses the same-frequency reselection field (intraFreqReselectionRedCap or intraFreqReselection) to determine the state of the cell on the same frequency as the first cell.

[0125] It is understandable that the first condition may also include other conditions, for example, the first condition may also include one or more of the following:

[0126] First sub-condition 2: the first frequency band is a frequency division duplex (FDD) frequency band.

[0127] Exemplarily, the terminal device supports one or more frequency bands in the TDD downlink frequency band list. Alternatively, the terminal device supports one or more frequency bands in the FDD uplink frequency band list. Furthermore, the one or more frequency bands are not frequency bands used only for downlink transmission. In other words, the one or more frequency bands include frequency bands that can be used for uplink transmission, and the first frequency band may be one or more of these frequency bands.

[0128] First sub-condition 3: The terminal device supports the transmission requirements of the first frequency band.

[0129] Exemplarily, the terminal device supports at least one transmission requirement for a downlink frequency band supporting TDD or an uplink frequency band supporting FDD.

[0130] First sub-condition 4: The terminal device supports the first uplink channel bandwidth, the maximum transmission bandwidth of the first uplink channel bandwidth is less than or equal to the carrier bandwidth, and greater than or equal to the bandwidth of the initial uplink bandwidth part BWP.

[0131] Exemplarily, the terminal device supports an uplink channel bandwidth, the maximum transmission bandwidth of the uplink channel bandwidth is less than or equal to the carrier bandwidth of the first cell and greater than or equal to the bandwidth of the initial uplink BWP of the first cell. In some implementations, if the terminal device is configured with a RedCap-specific initial uplink BWP, the initial uplink BWP is a RedCap-specific initial uplink BWP.

[0132] Optionally, the carrier bandwidth of the first cell is the carrier bandwidth corresponding to NUL, and the initial uplink BWP bandwidth of the first cell is the initial uplink BWP bandwidth corresponding to NUL.

[0133] First sub-condition 5: The terminal device supports the first downlink channel bandwidth, the maximum transmission bandwidth of the first downlink channel bandwidth is less than or equal to the carrier bandwidth, and greater than or equal to the bandwidth of the initial downlink BWP.

[0134] Exemplarily, the terminal device supports a downlink channel bandwidth, the maximum transmission bandwidth of the downlink channel bandwidth is less than or equal to the carrier bandwidth of the first cell and greater than or equal to the bandwidth of the initial downlink BWP of the first cell. In some implementations, if the terminal device is configured with a RedCap-specific initial downlink BWP, the initial downlink BWP is a RedCap-specific initial downlink BWP.

[0135] Optionally, the carrier bandwidth of the first cell is the carrier bandwidth corresponding to the downlink, and the initial downlink BWP bandwidth of the first cell is the initial downlink BWP bandwidth corresponding to NUL.

[0136] First sub-condition 6: the terminal device is enabled for uplink transmission with frequency shift, and the terminal device supports frequency shift on the first frequency band, or the terminal device is not enabled for uplink transmission with frequency shift.

[0137] Exemplarily, a terminal device may receive information #1, which is used to enable uplink transmission with a frequency shift. For example, information #1 may be a 7.5kHz frequency shift indication (frequencyShift7p5khz). If the network device is configured with a 7.5kHz frequency shift indication and the terminal device supports the corresponding 7.5kHz frequency shift on the first frequency band, then the first sub-condition 6 is satisfied. Alternatively, if the terminal device is not configured with frequencyShift7p5khz, then the first sub-condition 6 is satisfied.

[0138] It is understandable that the first condition not being satisfied may mean that any one or more of the sub-conditions included in the first condition are not satisfied. The first condition being satisfied may mean that all the sub-conditions included in the first condition are satisfied.

[0139] For example, if no first frequency band satisfies first sub-conditions 1 to 6, the terminal device considers the first cell to be in a prohibited state. If at least one first frequency band satisfies first sub-conditions 1 to 6, the terminal device should not consider the first cell to be prohibited. Furthermore, the terminal device can perform subsequent condition determination and frequency band selection.

[0140] It should be noted that when the first condition is met, the terminal device can determine that the first cell is barred. However, when the first condition is not met, the terminal device can determine that the first cell is not barred, or the terminal device can execute other conditions to further determine whether the first cell is barred.

[0141] Exemplarily, when the first condition is met, the terminal device determines whether the first cell is configured with a tracking area code (trackingAreaCode) or a tracking area list (trackingAreaList) of a public land mobile network (PLMN) or an equivalent PLMN to which the terminal device is registered. For example, if the network device does not provide the tracking area code or tracking area list of the selected PLMN or equivalent PLMN, the terminal device determines that the first cell is prohibited. If the network device provides any one or more of the above parameters, the terminal device may determine that the first cell is not prohibited.

[0142] In some implementations, the terminal device determines whether the cell is prohibited before determining whether the first condition is met. For example, when the first information does not include the second configuration information (i.e., the first cell does not support HD-FDD), and each of the multiple frequency bands in the frequency bandwidth list configured for the first cell obtained by the terminal device only supports HD-FDD, then the terminal device determines that the first cell is prohibited. Otherwise, the terminal device can perform the judgment of the first condition as described above to further determine whether the first cell is prohibited.

[0143] The above describes the mechanism by which a terminal device determines whether a first cell is barred. For example, if the terminal device determines that the first condition is not met, it determines that the cell is barred. If the first condition is met, and the terminal device does not determine that the first cell is barred, the terminal device may select a frequency band. Step S330 is then executed.

[0144] Optionally, in S330, the terminal device selects the first frequency band that meets the second condition among the frequency bands to which the first cell belongs.

[0145] The second condition includes: when the first information does not include the second configuration information, supporting the second communication mode (hereinafter represented by the second sub-condition 1).

[0146] For example, the second condition includes: when the half-duplex support field is not included in SIB1, FD-FDD is supported. In other words, when the half-duplex support field is not included in SIB1, not only HD-FDD is supported (for example, both FD-FDD and HD-FDD are supported).

[0147] It can be understood that: S330 can also be understood as, when the first information does not include the second configuration information, the terminal device selects the first frequency band that meets the second condition, and the second condition includes that the frequency band supports the second communication mode.

[0148] That is to say, when the first cell does not support HD-FDD, the terminal device can select the first frequency band in the frequency band to which the first cell belongs that not only supports HD-FDD (or supports FD-FDD). The first frequency band may refer to the first frequency band in the frequency band list of the first cell, or the frequency band with the smallest frequency band index, or the first frequency band arranged according to a specific rule, and this application does not specifically limit this. For example, in the frequency band list to which the first cell belongs, band 1, band 5, and band 7 meet the requirements of not only supporting HD-FDD (or supporting FD-FDD), then the terminal device can select band 1.

[0149] It is understandable that the second condition may also include other conditions, for example, the second condition may also include one or more of the following:

[0150] Second sub-condition 2: Support launch requirements.

[0151] Exemplarily, for the downlink frequency band of TDD or the uplink frequency band of FDD, at least one transmission requirement is supported.

[0152] Second sub-condition 3: In case of uplink transmission with frequency shift enabled, frequency shift is supported.

[0153] Exemplarily, the terminal device may receive information #1, which is used to enable uplink transmission of a frequency offset. For example, the information #1 may be a 7.5 kHz frequency offset indication.

[0154] It can be understood that the second sub-condition 3 is that in the case of uplink transmission with frequency offset enabled, the second condition includes that the terminal device supports frequency offset on the frequency band.

[0155] Exemplarily, the terminal device can select the first frequency band in the FDD uplink frequency band list, or the TDD downlink frequency band list, which the terminal device supports and the terminal device supports at least one transmission requirement, and if the half-duplex support field does not appear, not only supports the first frequency band in the frequency band of HD-FDD (or supports FD-FDD).

[0156] It should be noted that the first condition above can be used to determine whether the first cell is barred. The terminal device can determine whether the cell is barred by determining whether it has one or more first frequency bands that meet some of the first sub-conditions (sub-conditions related to the frequency band) in the first condition. The second condition can be used to select a frequency band, that is, select one of the frequency bands that meet the second condition.

[0157] In some implementations, the frequency band selected above is a frequency band in the NUL. After the terminal device selects the NUL frequency band, it may also select the SUL frequency band based on the configuration of the SUL. In this case, the terminal device and the network device may further perform the following step S340.

[0158] Optionally, in S340 , when the third condition is met, determine that the first cell is configured with a supplementary uplink carrier SUL.

[0159] The third condition includes: when the first information does not include the second configuration information, the terminal device supports the third communication mode on the second frequency band (hereinafter referred to as the third condition #1), or the first information includes the second configuration information (hereinafter referred to as the third condition #2). This condition can be subsequently recorded as the third sub-condition 1.

[0160] The frequency band to which the first cell SUL belongs includes the second frequency band, the first communication mode is different from the third communication mode, and the third communication mode can be the same as or different from the second communication mode.

[0161] The terminal device supports the third communication mode on the second frequency band, which can be understood as the terminal device supporting not only the first communication mode on the second frequency band. For example, the terminal device supports other communication modes in addition to the first communication mode on the second frequency band. For example, the terminal device supports FD-FDD on the second frequency band, or the terminal device supports not only HD-FDD on the second frequency band. In some implementations, the third communication mode is FD-FDD.

[0162] Illustratively, the third condition #1 includes: when the half-duplex support field is not included in SIB1, the terminal device supports FD-FDD. In other words, when the half-duplex support field is not included in SIB1, the terminal device supports not only HD-FDD (for example, supports FD-FDD and HD-FDD) on the second frequency band.

[0163] Exemplarily, the third condition #2 includes: including a half-duplex support field in SIB1.

[0164] Satisfying the third condition (or third sub-condition 1) can be understood as satisfying the third condition #1 or satisfying the third condition #2, that is, satisfying either the third condition #1 or the third condition #2. Situations in which the third condition is satisfied include: Scenario 1) The first information includes the second configuration information. Scenario 2) When the first information does not include the second configuration information, the terminal device supports the third communication mode on the second frequency band.

[0165] Exemplarily, the third condition is satisfied in the following cases: 1) SIB1 includes a half-duplex support field; 2) when SIB1 does not include a half-duplex support field, the terminal device supports FD-FDD on the SUL frequency band.

[0166] Failure to meet the third condition (or third sub-condition 1) can be understood as failing to meet either third condition #1 or third condition #2. That is, situations where the third condition is not met include: when the first information does not include the second configuration information, the terminal device only supports the third communication mode on the second frequency band. In this case, the terminal device should assume that the first cell is not configured with SUL. For example, when the first information does not include the half-duplex support field, the terminal device only supports HD-FDD on the second frequency band.

[0167] That is to say, if the third condition is not met, for example, when the first cell does not support HD-FDD, the terminal device does not support FD-HDD on the SUL band (or the terminal device only supports HD-FDD on the first band), the terminal device can determine that the first cell is not configured with SUL, avoiding the terminal device selecting the SUL band, causing the terminal device to fail to work.

[0168] The third frequency band is one or more frequency bands to which the SUL of the first cell belongs, or a cell included in the frequency band list of the SUL of the first cell. It is understood that if the third condition is met, it can be understood that at least one frequency point to which the SUL of the first cell belongs meets the third condition; if the third condition is not met, it can be understood that all frequency bands to which the SUL of the first cell belongs do not meet the third condition, and in this case, the terminal device believes that the first cell is not configured with a SUL.

[0169] Determining that the first cell is configured with a supplementary uplink carrier SUL can be understood as the terminal device believing that the first cell is configured with SUL, or the terminal device believing that the SUL of the first cell is available.

[0170] It is understandable that the third condition may also include other conditions, for example, the third condition may also include one or more of the following:

[0171] Third sub-condition 2: The terminal device includes the second frequency band in the list of frequency bands supported by SUL;

[0172] Exemplarily, the terminal device supports one or more frequency bands in the frequency band list of the SUL.

[0173] Third sub-condition 3: The terminal device supports the emission requirements of the second frequency band;

[0174] Exemplarily, the terminal device supports at least one transmission requirement for the SUL uplink frequency band.

[0175] Third sub-condition 4: The terminal device supports a second uplink channel bandwidth, the maximum transmission bandwidth of the second uplink channel bandwidth is less than or equal to the SUL carrier bandwidth, and greater than or equal to the bandwidth of the SUL initial uplink BWP;

[0176] Exemplarily, the terminal device supports an uplink channel bandwidth, the maximum transmission bandwidth of which is less than or equal to the carrier bandwidth of the first cell SUL and greater than or equal to the bandwidth of the initial uplink BWP of the first cell SUL.

[0177] Third sub-condition 5: the terminal device is enabled for uplink transmission with frequency shift, and the terminal device supports frequency shift on the second frequency band, or the terminal device is not enabled for uplink transmission with frequency shift.

[0178] The description about the second frequency band (SUL frequency band) in the third condition is similar to the description about the first frequency band (NUL frequency band) in the first condition, and is not repeated here.

[0179] For example, if the first cell is configured with SUL configuration information (such as supplementaryUplink), and the terminal device supports one or more frequency bands in the frequency band list of SUL, and the terminal device supports at least one transmission requirement corresponding to a supported SUL band, and the terminal device supports an uplink channel bandwidth that is less than or equal to the uplink carrier bandwidth and greater than or equal to the bandwidth of the initial BWP of SUL, and when the half-duplex support field does not appear, the terminal device supports not only HD-FDD on the frequency band (or the terminal device supports FD-FDD on the frequency band). The terminal device can consider that the first cell is configured with SUL.

[0180] The above describes the mechanism by which a terminal device determines whether a first cell is configured with SUL. For example, when the terminal device determines that the third condition is met, it determines that the first cell is configured with SUL. The terminal device can then select a SUL frequency band and execute step S350.

[0181] Optionally, in S350, when the third condition is met, the terminal device selects the first frequency band that meets the fourth condition in the SUL frequency band to which the first cell belongs.

[0182] The fourth condition includes: when the first information does not include the second configuration information, supporting the second communication mode (hereinafter represented by the fourth sub-condition 1).

[0183] Exemplarily, the fourth condition includes: when the half-duplex support field is not included in SIB1, FD-FDD is supported. In other words, when the half-duplex support field is not included in SIB1, not only HD-FDD is supported (for example, both FD-FDD and HD-FDD are supported). It can be understood that: S350 can also be understood as, when the first information does not include the second configuration information, the terminal device selects the first frequency band that meets the fourth condition, and the fourth condition includes that the frequency band supports the third communication mode.

[0184] That is to say, when the first cell does not support HD-FDD, the terminal device can select the first frequency band in the SUL frequency band to which the first cell belongs that not only supports HD-FDD (or supports FD-FDD). The first frequency band may refer to the first frequency band in the frequency band list of the first cell SUL, or the frequency band with the smallest frequency band index, or the first frequency band arranged according to a specific rule, and this application does not specifically limit this. For example, in the SUL frequency band list to which the first cell belongs, SUL band 1, SUL band 5, and SUL band 7 meet the requirements of not only supporting HD-FDD (or supporting FD-FDD), then the terminal device can select SUL band 1.

[0185] It is understandable that the fourth condition may also include other conditions, for example, the fourth condition may also include one or more of the following:

[0186] Fourth sub-condition 2: Support launch requirements;

[0187] Exemplarily, the terminal device supports at least one transmission requirement for the SUL uplink frequency band.

[0188] Fourth sub-condition 3: In case of uplink transmission with SUL frequency shift enabled, frequency shift is supported.

[0189] The description of the fourth condition is similar to that of the second condition and will not be repeated here.

[0190] Exemplarily, the terminal device can select the first frequency band supported by the terminal device and the second frequency band supported by the terminal device in the frequency band list of SUL and supporting at least one transmission requirement, and when the half-duplex support field does not appear, it supports not only HD-FDD (or FD-FDD) but also the first frequency band.

[0191] Based on the present technical solution, the terminal device takes into account the ability of the terminal device to support a communication mode on the first frequency band in the conditions for determining whether the first cell is prohibited, thereby avoiding the problem of mismatch between the communication mode supported by the first cell and the communication mode supported by the terminal device on the first frequency band on the first frequency band, and improving the reliability of the terminal device's operation.

[0192] In the communication method described in FIG3 above, when the terminal device determines whether the first cell is prohibited, even if the first cell does not support HD-FDD, the terminal device supports not only HD-FDD on one or some frequency bands, and the terminal device can consider that the first cell is not prohibited. The embodiment of the present application also provides a method, which is different from the communication method described in FIG3 in that when the first cell does not support HD-FDD, the terminal device can determine that the first cell is prohibited as long as it supports only HD-FDD on one frequency band among all frequency bands. This implementation method is described below in conjunction with FIG4.

[0193] FIG4 is a schematic flowchart of another communication method provided in an embodiment of the present application.

[0194] S410: The terminal device receives first information from the network device. Correspondingly, the network device sends the first information to the terminal device.

[0195] The first information includes first configuration information and second configuration information, or the first information includes the first configuration information but does not include the second configuration information, wherein the first configuration information indicates the N frequency bands to which the first cell belongs, and the second configuration information indicates that the first cell supports the first communication mode, and N is a positive integer.

[0196] In some implementations, the N frequency bands include a normal uplink carrier (NUL) frequency band and a supplementary uplink carrier (SUL) frequency band. For example, the N frequency bands include frequency bands belonging to a normal uplink carrier and frequency bands belonging to a supplementary uplink carrier. That is, if the network device is configured with SUL, the frequency band list includes frequency band lists for NUL and SUL.

[0197] For a more detailed description of the first information, please refer to the description of step S310 in FIG3 above, which will not be repeated here.

[0198] S420: When the fifth condition is met, the terminal device determines that the first cell is prohibited.

[0199] The fifth condition includes: when the first information does not include the second configuration information, the terminal device supports the first communication mode on at least one frequency band of the N frequency bands and does not support the second communication mode, and the first communication mode and the second communication mode are different.

[0200] In other words, the fifth condition includes: when the first information does not include the second configuration information, the terminal device only supports the first communication mode on at least one frequency band among the N frequency bands.

[0201] Exemplarily, the fifth condition includes: when the half-duplex support field is not included in SIB1, the terminal device only supports HD-FDD on at least one frequency band among the N frequency bands.

[0202] When the first cell does not support HD-FDD, the terminal device only supports HD-FDD on one frequency band among all frequency bands, and the terminal device may determine that the first cell is prohibited.

[0203] Based on this technical solution, the terminal device takes into account the ability of the terminal device to support communication modes on N frequency bands in the conditions for determining whether the first cell is prohibited, thereby avoiding the problem of mismatch between the communication mode supported by the first cell and the communication mode supported by the terminal device on the selected frequency band, and improving the reliability of the terminal device.

[0204] In some implementations, an embodiment of the present application provides a method for reporting capabilities.

[0205] Exemplarily, the terminal device sends capability information to the network device, and correspondingly, the network device receives the capability information from the terminal device.

[0206] The capability information indicates whether the terminal device supports or does not support half-duplex frequency division duplex HD-FDD on a first frequency band pair, where the first frequency band pair includes a frequency band of a supplementary uplink carrier and a frequency band of a downlink carrier.

[0207] Optionally, the supplementary uplink frequency band is a supplementary uplink frequency band supported by the terminal device, and the downlink carrier frequency band is a downlink carrier frequency band supported by the terminal device.

[0208] That is, when reporting the SUL's support for HD-FDD, the terminal device may report specifically on the downlink frequency band. For example, the terminal device may report whether HD-FDD is supported in conjunction with the SUL for one or more supported downlink frequency bands.

[0209] When selecting a frequency band, if the terminal device selects SUL, it can determine whether to use SUL based on the HD-FDD capability of its own SUL-DL frequency band pair and the capability of the optional cell to support HD-FDD.

[0210] The network determines whether the terminal device supports HD-FDD based on the HD-FDD capability corresponding to the SUL-DL frequency band pair reported by the terminal device.

[0211] Currently, in existing technologies, terminal devices and network equipment can only assume that the UE supports HD-FDD on all downlink frequency bands for the SUL, or does not support HD-FDD at all. Based on this technical solution, by requiring terminal devices to report SUL support for HD-FDD specifically for downlink frequency bands, it can provide more flexible and fine-grained indication of SUL support for HD-FDD.

[0212] It is understandable that the methods of FIG. 2 and FIG. 3 and reporting capabilities provided in the above embodiment of the application can be implemented separately or in combination. For example, the method provided in FIG. 2 and the method of reporting capabilities can be implemented in combination. For example, in step S340 of FIG. 2 , the terminal device can use the method of reporting capabilities to determine whether HD-FDD is supported on the frequency band of SUL. For another example, the method provided in FIG. 3 and the method of reporting capabilities can be implemented in combination. For example, the terminal device can use the method of FIG. 3 to determine whether the cell is prohibited, and use the method of reporting capabilities in subsequent processes to determine whether the terminal device supports HD-FDD on the frequency band of SUL. This application does not specifically limit this.

[0213] As used herein, the term "at least one of" or "at least one of" refers to all or any combination of the listed items. For example, "at least one of A, B, and C" can mean: A alone, B alone, C alone, A and B together, B and C together, and A, B, and C together. As used herein, "at least one" means one or more. "A plurality" means two or more.

[0214] It should be understood that in the various embodiments of the present application, "B corresponding to A" means that B is associated with A and can be determined based on A. However, it should also be understood that determining B based on A does not mean determining B solely based on A; B can also be determined based on A and / or other information. The terms "include," "comprising," "having," and their variations all mean "including but not limited to," unless otherwise specifically emphasized.

[0215] It is understood that in various embodiments of the present application, the first, second, and various numerical numbers are merely distinctions for ease of description and are not intended to limit the scope of the embodiments of the present application.

[0216] It is understandable that in various embodiments of the present application, "indication" may include direct indication and indirect indication, and may also include explicit indication and implicit indication. The information indicated by a certain information (such as the first information mentioned above) is referred to as information to be indicated. In the specific implementation process, there are many ways to indicate the information to be indicated, such as but not limited to, the information to be indicated can be directly indicated, such as the information to be indicated itself or the index of the information to be indicated. The information to be indicated can also be indirectly indicated by indicating other information, wherein the other information and the information to be indicated have an association relationship. It is also possible to indicate only a part of the information to be indicated, while the other parts of the information to be indicated are known or agreed in advance. For example, the indication of specific information can also be achieved by means of the arrangement order of each information agreed in advance (such as specified in the protocol), thereby reducing the indication overhead to a certain extent.

[0217] It can be understood that in various embodiments of the present application, "pre-configuration" can be achieved by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in a device (for example, a first terminal device), and the present application does not limit its specific implementation method.

[0218] It is understood that in some of the above embodiments, when "transmission" is mentioned, unless otherwise specified, transmission includes receiving and / or sending. For example, transmitting a signal may include receiving a signal and / or sending a signal.

[0219] It can be understood that, in various embodiments of the present application, “receiving” may also be replaced by “detecting” or “monitoring”.

[0220] It is understood that in the various embodiments of this application, the interaction between a terminal device and a network device is mainly used as an example for illustration, and this application is not limited to this. The terminal device can be replaced by a receiving device, which can be a terminal device or a network device; the network device can be replaced by a sending device, which can be a terminal device or a network device. For example, "terminal device" can be replaced by "first terminal device" and "network device" can be replaced by "second terminal device."

[0221] It is understood that the formulas involved in the various embodiments of the present application are merely illustrative and do not limit the scope of protection of the embodiments of the present application. In the process of calculating the various parameters involved above, calculations can also be performed according to the above formulas, or based on variations of the above formulas, or calculations can be performed in other ways to meet the results of the formula calculations.

[0222] It is understandable that some optional features in the embodiments of the present application may not depend on other features in some scenarios, and may also be combined with other features in some scenarios, without limitation.

[0223] It is understandable that the solutions in the various embodiments of the present application can be reasonably combined and used, and the explanations or descriptions of the various terms appearing in the embodiments can be referenced or explained with each other in the various embodiments, without limitation to this.

[0224] It can also be understood that in the above-mentioned method embodiments, the methods and operations implemented by the terminal device can also be implemented by components that can be formed by the terminal device (such as chips or circuits); in addition, the methods and operations implemented by the network device can also be implemented by components that can be formed by the network device (such as chips or circuits), without limitation.

[0225] Corresponding to the methods provided in the above method embodiments, embodiments of the present application also provide corresponding apparatuses, which include modules for executing the corresponding methods in the above method embodiments. The modules may be software, hardware, or a combination of software and hardware. It is understood that the technical features described in the above method embodiments are also applicable to the following apparatus embodiments.

[0226] Referring to Figure 5 , as an example, Figure 5 is a schematic diagram of a communication device 10 provided in an embodiment of the present application. Device 10 includes a transceiver unit 11 and a processing unit 12. Transceiver unit 11 can be used to implement corresponding communication functions. Transceiver unit 11 can also be referred to as a communication interface or communication unit. Processing unit 12 can be used to process data or information.

[0227] Optionally, the device 10 further includes a storage unit, which can be used to store instructions and / or data. The processing unit 12 can read the instructions and / or data in the storage unit so that the device implements the aforementioned various method embodiments.

[0228] In one possible design, the device 10 can be used to execute the actions performed by the terminal device in the above method embodiments. In this case, the device 10 can be a terminal device or a component of the terminal device, the transceiver unit 11 is used to execute the transceiver-related operations on the terminal device side in the above method embodiments, and the processing unit 12 is used to execute the processing-related operations on the terminal device side in the above method embodiments.

[0229] A first possible implementation method is that the transceiver unit 11 is used to receive first information, where the first information includes first configuration information and second configuration information, or the first information includes the first configuration information but does not include the second configuration information, wherein the first configuration information indicates the frequency band to which the first cell belongs, and the second configuration information indicates that the first cell supports the first communication mode; the processing unit 12 is used to determine whether the first cell is prohibited or not prohibited based on a first condition, and when the first condition is not met, the first cell is prohibited; wherein the first condition includes: when the first information does not include the second configuration information, the terminal device supports the second communication mode on the first frequency band, wherein the frequency band to which the first cell belongs includes the first frequency band, and the first communication mode and the second communication mode are different.

[0230] The apparatus 10 can implement the steps or processes corresponding to those performed by the terminal device in the method embodiment according to the embodiment of the present application. The apparatus 10 may include units for executing the method performed by the terminal device in the method embodiment according to the embodiment of the present application. The specific process of each unit executing the above-mentioned corresponding steps has been described in detail in the above-mentioned method embodiments and will not be repeated here for the sake of brevity.

[0231] Another possible design is that the device 10 can be used to execute the actions performed by the network device in the above method embodiments. In this case, the device 10 can be a network device or a component of a network device, the transceiver unit 11 is used to execute the transceiver-related operations on the network device side in the above method embodiments, and the processing unit 12 is used to execute the processing-related operations on the network device side in the above method embodiments.

[0232] In a first possible implementation, the processing unit 12 is used to generate first information; the transceiver unit 11 is used to send the first information, the first information includes first configuration information and second configuration information, or the first information includes the first configuration information but does not include the second configuration information, wherein the first configuration information indicates the frequency band to which the first cell belongs, and the second configuration information indicates that the first cell supports the first communication mode; wherein, if the first condition is not met, the first cell is prohibited, and the first condition includes: if the first information does not include the second configuration information, the terminal device supports the second communication mode on the first frequency band, wherein the frequency band to which the first cell belongs includes the first frequency band, and the first communication mode and the second communication mode are different.

[0233] The apparatus 10 can implement the steps or processes performed by the network device in the method embodiment according to the embodiment of the present application. The apparatus 10 may include a unit for executing the method performed by the network device in the method embodiment according to the embodiment of the present application. The specific process of each unit performing the above-mentioned corresponding steps has been described in detail in the above-mentioned method embodiments and will not be repeated here for the sake of brevity.

[0234] It should be understood that the device 10 here is embodied in the form of a functional unit. The term "unit" here may refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (such as a shared processor, a dedicated processor or a group processor, etc.) and a memory for executing at least one software or firmware program, a combined logic circuit and / or other suitable components that support the described functions. In an optional example, those skilled in the art will understand that the device 10 may be specifically the terminal device in the above-mentioned embodiment, and may be used to execute the various processes and / or steps corresponding to the terminal device in the above-mentioned method embodiments; or, the device 10 may be specifically the network device in the above-mentioned embodiment, and may be used to execute the various processes and / or steps corresponding to the network device in the above-mentioned method embodiments. To avoid repetition, it will not be described here.

[0235] The apparatus 10 of each of the above-mentioned solutions has the function of implementing the corresponding steps performed by the communication device (such as a terminal device or a network device) in the above-mentioned method. The functions can be implemented by hardware, or the corresponding software can be implemented by hardware. The hardware or software includes at least one module corresponding to the above-mentioned functions; for example, the transceiver unit can be replaced by a transceiver (for example, the sending unit in the transceiver unit can be replaced by a transmitter, and the receiving unit in the transceiver unit can be replaced by a receiver), and other units, such as the processing unit, can be replaced by a processor to respectively perform the sending and receiving operations and related processing operations in each method embodiment.

[0236] In addition, the transceiver unit 11 may also be a transceiver circuit (for example, may include a receiving circuit and a sending circuit), and the processing unit may be a processing circuit.

[0237] It should be noted that the apparatus in FIG5 may be the device in the aforementioned embodiment, or may be a chip or chip system, such as a system on chip (SoC). The transceiver unit may be an input / output circuit or a communication interface; the processing unit may be a processor, microprocessor, or integrated circuit integrated on the chip. This is not limited here.

[0238] Referring to Figure 6 , as an example, Figure 6 is a schematic diagram of another communication device 20 provided in an embodiment of the present application. The device 20 includes a processor 21, which is coupled to a memory 22. Optionally, the device 20 also includes the memory 22. The memory 22 is used to store computer programs or instructions and / or data. The processor 21 is used to execute the computer programs or instructions stored in the memory 22, or read the data stored in the memory 22, to perform the methods described in the above method embodiments.

[0239] Optionally, there is at least one processor 21.

[0240] Optionally, there is at least one memory 22.

[0241] Optionally, the memory 22 is integrated with the processor 21 or provided separately.

[0242] Optionally, as shown in Figure 6, the device 20 further includes a transceiver 23, which is used to receive and / or send signals. For example, the processor 21 is used to control the transceiver 23 to receive and / or send signals.

[0243] As a solution, the apparatus 20 is used to implement the operations performed by the terminal device in each of the above method embodiments.

[0244] For example, the processor 21 is configured to execute computer programs or instructions stored in the memory 22 to implement the relevant operations of the terminal device in the above various method embodiments. For example, the method executed by the terminal device in the embodiment shown in FIG3 .

[0245] As another solution, the device 20 is used to implement the operations performed by the network device in the above various method embodiments.

[0246] For example, the processor 21 is configured to execute computer programs or instructions stored in the memory 22 to implement the relevant operations of the network device in the above various method embodiments. For example, the method executed by the network device in the embodiment shown in FIG3 .

[0247] It should be understood that the processor mentioned in the embodiments of the present application may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc.

[0248] It should also be understood that the memory mentioned in the embodiments of the present application may be a volatile memory and / or a non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM). For example, RAM can be used as an external cache. By way of example and not limitation, RAM includes the following forms: static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM).

[0249] It should be noted that when the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, the memory (storage module) can be integrated into the processor.

[0250] It should also be noted that the memory described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0251] 7 , as an example, is a schematic diagram of a chip system 30 provided in accordance with an embodiment of the present application. The chip system 30 (or processing system) includes a logic circuit 31 and an input / output interface 32 .

[0252] The logic circuit 31 may be a processing circuit in the chip system 30. The logic circuit 31 may be coupled to a storage unit and call instructions in the storage unit so that the chip system 30 can implement the methods and functions of the various embodiments of the present application. The input / output interface 32 may be an input / output circuit in the chip system 30, outputting information processed by the chip system 30 or inputting data or signaling information to be processed into the chip system 30 for processing.

[0253] Specifically, for example, if the terminal device is installed with the chip system 30, the logic circuit 31 is coupled to the input / output interface 32, and the input / output interface 32 can input the wake-up signal to the logic circuit 31 for processing.

[0254] As a solution, the chip system 30 is used to implement the operations performed by the terminal device in the above various method embodiments.

[0255] For example, the logic circuit 31 is used to implement the processing-related operations performed by the terminal device in the above method embodiments, such as the processing-related operations performed by the terminal device in the embodiment shown in Figure 3; the input / output interface 32 is used to implement the sending and / or receiving-related operations performed by the terminal device in the above method embodiments, such as the sending and / or receiving-related operations performed by the terminal device in the embodiment shown in Figure 3.

[0256] As another solution, the chip system 30 is used to implement the operations performed by the network device in the above various method embodiments.

[0257] For example, the logic circuit 31 is used to implement the processing-related operations performed by the network device in the above method embodiments, such as the processing-related operations performed by the network device in the embodiment shown in Figure 3; the input / output interface 32 is used to implement the sending and / or receiving-related operations performed by the network device in the above method embodiments, such as the sending and / or receiving-related operations performed by the network device in the embodiment shown in Figure 3.

[0258] An embodiment of the present application further provides a computer-readable storage medium on which computer instructions for implementing the methods executed by the device in the above-mentioned method embodiments are stored.

[0259] For example, when the computer program is executed by a computer, the computer can implement the method executed by the terminal device in each embodiment of the above method.

[0260] For another example, when the computer program is executed by a computer, the computer can implement the methods performed by the network device in each embodiment of the above method.

[0261] An embodiment of the present application also provides a computer program product, comprising instructions, which, when executed by a computer, implement the methods performed by a terminal device or a network device in the above-mentioned method embodiments.

[0262] An embodiment of the present application also provides a communication system, which includes the terminal device and network device in the above embodiments.

[0263] The explanation of the relevant contents and beneficial effects of any of the above-mentioned devices can be referred to the corresponding method embodiments provided above, which will not be repeated here.

[0264] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods, such as at least two units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0265] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes at least one computer instruction. When the computer program instruction is loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. For example, the computer can be a personal computer, a server, or a network device, etc. The computer instruction can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instruction can be transmitted from one website, computer, server or data center to another website, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes at least one available medium integrated. The available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid state disk (SSD)). For example, the aforementioned available medium includes, but is not limited to, various media that can store program code, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

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

Claims

1. A communication method, characterized in that: The method is applicable to a terminal device or a chip of the terminal device, and the method includes: receiving first information, where the first information includes first configuration information and second configuration information, or the first information includes the first configuration information but does not include the second configuration information, wherein the first configuration information indicates that a frequency band to which the first cell belongs includes a first frequency band, and the second configuration information indicates that the first cell supports a first communication mode; It is determined based on a first condition whether the first cell is barred or not barred, wherein: The first condition includes: First sub-condition: when the first information does not include the second configuration information, the terminal device supports the second communication mode on the first frequency band; or Second sub-condition: the first information includes the second configuration information; The first communication mode and the second communication mode are different.

2. The method according to claim 1, characterized in that The method further comprises: When the first condition is not satisfied, the first cell is prohibited; the first condition not being satisfied includes the first sub-condition not being satisfied and the second sub-condition not being satisfied.

3. The method according to claim 1 or 2, characterized in that The first information is system information block 1 SIB1, and the first configuration information is a frequency band list frequencyBandList.

4. The method according to any one of claims 1 to 3, characterized in that The terminal device is a reduced capability terminal device redcapUE.

5. The method according to any one of claims 1 to 4, characterized in that The first communication mode is half-duplex frequency division duplex HD-FDD, and the second communication mode is full-duplex frequency division duplex FD-FDD.

6. The method according to any one of claims 1 to 5, characterized in that The method further includes: determining that the first cell is barred when one or more of the following conditions are not satisfied: The first frequency band is a frequency division duplex FDD frequency band; The terminal device supports the transmission requirement of the first frequency band; The terminal device supports a first uplink channel bandwidth, the maximum transmission bandwidth of the first uplink channel bandwidth is less than or equal to the carrier bandwidth, and is greater than or equal to the bandwidth of the initial uplink bandwidth part BWP; The terminal device supports a first downlink channel bandwidth, the maximum transmission bandwidth of the first downlink channel bandwidth is less than or equal to the carrier bandwidth, and is greater than or equal to the bandwidth of the initial downlink BWP; The terminal device is enabled for uplink transmission with frequency shift, and the terminal device supports frequency shift on the first frequency band, or the terminal device is not enabled for uplink transmission with frequency shift.

7. The method according to any one of claims 1 to 6, characterized in that When the first condition is met, selecting a first frequency band that meets a second condition in the frequency band to which the first cell belongs, where the second condition includes: In a case where the first information does not include the second configuration information, the second communication mode is supported.

8. The method according to claim 7, characterized in that The second condition also includes one or more of the following: Support launch requirements; In case of uplink transmission with frequency shift enabled, frequency shift is supported.

9. The method according to any one of claims 1 to 8, characterized in that The method further comprises: When the third condition is met, it is determined that the first cell is configured with a supplementary uplink carrier SUL; wherein, The third condition includes: when the first information does not include the second configuration information, the terminal device supports the third communication mode on the second frequency band; or the first information includes the second configuration information; The frequency band to which the first cell SUL belongs includes the second frequency band, and the first communication mode and the third communication mode are different.

10. The method according to claim 9, characterized in that The third condition also includes one or more of the following: The SUL frequency band list supported by the terminal device includes the second frequency band; The terminal device supports the transmission requirement of the second frequency band; The terminal device supports a second uplink channel bandwidth, the maximum transmission bandwidth of the second uplink channel bandwidth is less than or equal to the SUL carrier bandwidth, and is greater than or equal to the bandwidth of the SUL initial uplink BWP; The terminal device is enabled for uplink transmission with frequency shift, and the terminal device supports frequency shift on the second frequency band, or the terminal device is not enabled for uplink transmission with frequency shift.

11. The method according to claim 9 or 10, characterized in that When the third condition is met, selecting a first frequency band in the SUL frequency band to which the first cell belongs that meets a fourth condition, where the fourth condition includes: In a case where the first information does not include the second configuration information, the second communication mode is supported.

12. The method according to claim 11, characterized in that The fourth condition also includes one or more of the following: Support launch requirements; In case of uplink transmission with frequency offset enabled for SUL, frequency offset is supported.

13. A communication method, characterized in that: The method is applicable to a terminal device or a chip of the terminal device, and the method includes: receiving first information, where the first information includes first configuration information and second configuration information, or the first information includes the first configuration information but does not include the second configuration information, wherein the first configuration information indicates that a frequency band to which the first cell belongs is a first frequency band, and the second configuration information indicates that the first cell supports a first communication mode; When the first sub-condition is not met and the second sub-condition is not met, determining that the first cell is prohibited; The first sub-condition is that when the first information does not include the second configuration information, the terminal device supports the second communication mode on the first frequency band, and the second sub-condition is that the first information includes the second configuration information.

14. The method according to claim 13, characterized in that The first information is system information block 1 SIB1, and the first configuration information is a frequency band list frequencyBandList.

15. The method according to claim 13 or 14, characterized in that The terminal device is a reduced capability terminal device redcap UE.

16. The method according to any one of claims 13 to 15, characterized in that The first communication mode is half-duplex frequency division duplex HD-FDD, and the second communication mode is full-duplex frequency division duplex FD-FDD.

17. A communication system, characterized in that: Including network equipment and terminal equipment: The network device sends first information to the terminal device, where the first information includes first configuration information and second configuration information, or the first information includes the first configuration information but does not include the second configuration information, wherein the first configuration information indicates a frequency band to which the first cell belongs, and the second configuration information indicates that the first cell supports a first communication mode; The terminal device determines whether the first cell is prohibited or not prohibited based on a first condition, wherein: The first condition includes: First sub-condition: when the first information does not include the second configuration information, the terminal device supports the second communication mode on the first frequency band; or Second sub-condition: the first information includes the second configuration information; The first communication mode and the second communication mode are different.

18. A communication device, characterized in that: The device comprises a transceiver unit and a processing unit, wherein: The transceiver unit is configured to receive first information, where the first information includes first configuration information and second configuration information, or the first information includes the first configuration information but does not include the second configuration information, wherein the first configuration information indicates a frequency band to which the first cell belongs, and the second configuration information indicates that the first cell supports a first communication mode; The processing unit is configured to determine whether the first cell is prohibited or not prohibited based on a first condition, wherein: The first condition includes: First sub-condition: when the first information does not include the second configuration information, the terminal device supports the second communication mode on the first frequency band; or Second sub-condition: the first information includes the second configuration information; The first communication mode and the second communication mode are different.

19. A communication device, characterized in that: The device comprises a transceiver unit and a processing unit, wherein: The transceiver unit is configured to receive first information, where the first information includes first configuration information and second configuration information, or the first information includes the first configuration information but does not include the second configuration information, wherein the first configuration information indicates that a frequency band to which the first cell belongs is a first frequency band, and the second configuration information indicates that the first cell supports a first communication mode; When the first sub-condition is not satisfied and the second sub-condition is not satisfied, the processing unit is used to determine that the first cell is prohibited; The first sub-condition is that when the first information does not include the second configuration information, the terminal device supports the second communication mode on the first frequency band, and the second sub-condition is that the first information includes the second configuration information.

20. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed on a computer, the computer is caused to execute the method according to any one of claims 1 to 12, or the method according to claim 13 or 16.

21. A computer program product, characterized in that The method comprises a computer program code, which, when executed on a computer, causes the computer to execute the method according to any one of claims 1 to 12, or causes the computer to execute the method according to claim 13 or 16.

22. A communication device, characterized in that: include: A processor, configured to execute a computer program stored in a memory, so that the computer executes the method according to any one of claims 1 to 12, or the computer executes the method according to claim 13 or 16.

23. The device according to claim 22, characterized in that The apparatus also includes the memory.

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