Communication method and communication apparatus

Abstract

The present application discloses a communication method and a communication apparatus. The method comprises: a network device sending a first message to a terminal device; and the terminal device sending first information to the network device. The first message is used to configure a first carrier combination. The first information is used to indicate a first frequency band, the first frequency band being a frequency band which is not supported under the first carrier combination due to dual-sim reasons. In the method, the first frequency band is a frequency band which is not supported under the first carrier combination due to dual-sim reasons, or the first frequency band is specifically for the first carrier combination. If the carrier combination currently configured by the terminal device is the first carrier combination, the network device may configure the first frequency band for the terminal device. Compared with existing network devices that do not configure a first frequency band for a terminal device by default for any carrier combination, the present disclosure can improve the flexibility of the carrier combination configured for a terminal device by a network device, reduce excessive limitation on the frequency band of the terminal device, and improve system performance.

Description

Communication method and communication device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on September 28, 2023, with application number 202311295245.7 and application name "A Communication Method and Communication Device", the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of communication technology, and in particular to a communication method and a communication device. Background Art

[0004] Network devices configure and schedule terminal devices based on their capabilities to ensure normal communication between them and the network. Typically, terminal device capabilities are relatively static, but in certain scenarios, they can change. For example, for a terminal device that supports multiple user identities, its capabilities may change as it switches between single-user and multi-user operation.

[0005] To ensure that network equipment does not configure terminal devices beyond their actual capabilities, when a terminal device's capabilities change, the terminal device reports temporarily restricted capabilities to the network equipment. Currently, network equipment cannot accurately detect the restricted capabilities of terminal devices. Inconsistent understanding between network equipment and terminal devices can cause network configurations to exceed the restricted capabilities, leading to anomalies such as bit errors and re-establishment, or excessive network restrictions, which can reduce communication performance and information transmission rates.

[0006] Summary of the Invention

[0007] The present application provides a communication method and a communication device to enable network equipment to accurately know the limited capabilities of terminal equipment, avoid network configuration exceeding the actual capabilities of terminal equipment, reduce excessive restrictions on the capabilities of terminal equipment, ensure communication performance, and improve information transmission rate.

[0008] To achieve the above objectives, the present invention adopts the following technical solutions:

[0009] In a first aspect, embodiments of the present application provide a communication method that can be performed by a first communication device. The first communication device can be a terminal device, or the first communication device can be a component used to implement the functions of the terminal device. For example, the first communication device can be a unit / module, circuit, or chip within the terminal device. The method provided in the first aspect is described below using the first communication device as an example of the terminal device itself. Of course, the method provided in the first aspect can also be implemented by a unit / module, circuit, or chip within the terminal device.

[0010] The communication method includes: a terminal device receiving a first message from a network device and sending first information to the network device, wherein the first message is used to configure a first carrier combination. The first information is used to indicate a first frequency band, which is a frequency band that is not supported under the first carrier combination due to dual SIM card issues.

[0011] Accordingly, in a second aspect, embodiments of the present application provide a communication method that can be performed by a second communication device. The second communication device can be a terminal device, or the second communication device can be a component used to implement the functions of a network device. For example, the second communication device can be a unit / module, circuit, or chip within the network device. The method provided in the second aspect is described below using the second communication device as an example, wherein the second communication device is the network device itself. Of course, the method provided in the second aspect can also be implemented by a unit / module, circuit, or chip within the network device.

[0012] The communication method includes: a network device sending a first message and receiving first information from a terminal device, wherein the first message is used to configure a first carrier combination, and the first information is used to indicate a first frequency band, which is a frequency band that is not supported under the first carrier combination due to dual SIM card issues.

[0013] In the method provided in the first aspect or the second aspect, the first frequency band indicated by the terminal device to the network device is a frequency band that is not supported under the first carrier combination due to dual-card reasons. The first frequency band is for the first carrier combination, so that the network device accurately knows the restricted frequency band of the terminal device. If the carrier combination currently configured by the terminal device is the first carrier combination, then the network device can configure the first frequency band for the terminal device. Compared with the current network device's default of not configuring the first frequency band for the terminal device for any carrier combination, the flexibility of the carrier combination configured by the network device for the terminal device can be improved, excessive restrictions on the frequency band of the terminal device can be reduced, and communication performance can be improved.

[0014] In an implementation of the first aspect, the method further includes: the terminal device sending second information to the network device, the second information being used to indicate a second frequency band and a capability parameter corresponding to the second frequency band, the second frequency band being a frequency band whose capability is limited under the first carrier combination due to dual SIM card issues. Accordingly, in an implementation of the second aspect, the method further includes: the network device receiving second information from the terminal device, the second information being used to indicate the second frequency band and a capability parameter corresponding to the second frequency band, the second frequency band being a frequency band whose capability is limited under the first carrier combination due to dual SIM card issues.

[0015] The second frequency band indicated by the terminal device to the network device is a frequency band with limited capabilities under the first carrier combination due to dual SIM card issues, or in other words, the limited second frequency band is specific to the first carrier combination. The second information includes capability parameters corresponding to the second frequency band. Under the first carrier combination, the network device can configure more appropriate parameters for the terminal device based on the capability parameters corresponding to the second frequency band, so that the terminal device's configuration does not exceed the terminal device's actual capabilities.

[0016] In one implementation of the first aspect, the first frequency band is a frequency band that is not supported under the first carrier combination due to dual-card reasons, including: the first frequency band is at least one frequency band that is not supported to be configured as a secondary cell (SCell) or a secondary cell group (SCG) under the first carrier combination; or, the first frequency band is at least one frequency band that is not supported to be added as an SCell or SCG under the first carrier combination.

[0017] In an implementation manner of the first aspect, the first frequency band is at least one frequency band that is not supported to be configured as an SCell or SCG under the first carrier combination, including: the first frequency band is at least one frequency band of the affected SCell or SCG under the first carrier combination, and the affected SCell or SCG is the cell corresponding to the carrier in the first carrier combination; or, the first frequency is at least one frequency band of the SCell or SCG requested to be released under the first carrier combination, and the SCell or SCG requested to be released is the cell corresponding to the carrier in the first carrier combination.

[0018] In an implementation manner of the first aspect or the second aspect, the carrier combination currently configured by the terminal device is changed from the first carrier combination to the second carrier combination, and the first information becomes invalid.

[0019] The failure of the first information can be understood as that under the first carrier combination, the terminal device can support the first frequency band, or the restricted capability is lifted. In this solution, it can be assumed that the first information is for the currently configured carrier combination. If the current configuration is not the first carrier combination, the network device can configure the first frequency band for the terminal device. For example, if the currently configured carrier combination changes (for example, the currently configured first carrier combination is changed to the second carrier combination), then the first information becomes invalid. This solution does not require additional signaling to indicate the failure of the first information, which can save signaling overhead. The second carrier combination and the first carrier combination correspond to different frequency band combinations. Alternatively, the frequency band corresponding to at least one carrier in the second carrier combination is different from the frequency band corresponding to at least one carrier in the first carrier combination, or the frequency corresponding to at least one carrier in the second carrier combination is different from the frequency corresponding to at least one carrier in the first carrier combination. When the frequency of the carrier corresponding to the primary cell in the second carrier combination and the first carrier combination changes, the first information becomes invalid.

[0020] In an implementation of the first aspect, the method further includes: the terminal device sending indication information to the network device, the indication information being used to indicate that the first information is invalid. Correspondingly, in an implementation of the second aspect, the method further includes: the terminal device sending indication information to the network device, the indication information being used to indicate that the first information is invalid.

[0021] In this solution, the terminal device can indicate the invalidation of the first information through the indication information, so that the network device can clearly know that the first information is invalid, thereby configuring more reasonable parameters for the terminal device as much as possible to improve the system communication performance.

[0022] In an implementation manner of the first aspect or the second aspect, the indication information is used to indicate that the first information is invalid, including but not limited to the following methods, which are relatively flexible.

[0023] Method 1: The indication information is 1 bit, and the value of the 1 bit is the first value. The indication information indicates that the first information is invalid, which is relatively simple.

[0024] Method 2: The indication information does not include information about the first frequency band, indicating that the first information is invalid; wherein the indication information is used to indicate unsupported frequency bands under the first carrier combination. When the terminal device indicates all unsupported frequency bands to the network device each time, the terminal device may reuse signaling for reporting restricted frequency bands to indicate the invalidation of the first information.

[0025] Mode 3: The indication information is a UE assistance information (UAI) message, the UAI message includes a first field, and the first field is used to indicate that the first information is invalid. The UAI message is multiplexed to indicate that the first information is invalid.

[0026] Mode 4: When the indication information is a UAI message and the UAI message does not include the first field, the UAI message is used to indicate that the first information is invalid.

[0027] In an implementation of the first aspect, the method further includes: before the terminal device sends the first information to the network device, the terminal device further receives a second message from the network device, the second message including information about a candidate service frequency, where the candidate service frequency is the frequency of a candidate SCell or a candidate SCG under the first carrier combination. Accordingly, in an implementation of the second aspect, the method further includes: the network device sends the second message to the terminal device, the second message including information about a candidate service frequency, where the candidate service frequency is the frequency of a candidate SCell or a candidate SCG under the first carrier combination.

[0028] In an implementation of the first aspect, the first frequency band includes one or more frequencies among candidate serving frequencies and / or frequencies corresponding to the first carrier combination. The unsupported frequency band indicated by the terminal device to the network device is a frequency / frequency band among the candidate serving frequencies.

[0029] In this solution, if the network device is configured with candidate service frequencies, the terminal device may only consider restricted frequencies among the candidate service frequencies to avoid reporting unnecessary frequencies, thereby minimizing the overhead of the first information.

[0030] In an implementation manner of the first aspect, the first frequency band is a first frequency, and the first information is an ARFCN, where the ARFCN is used to indicate the first frequency; or, the first information is an index or identifier of at least one frequency band.

[0031] In a third aspect, embodiments of the present application provide a communication method that can be performed by a first communication device. The first communication device can be a terminal device, or the first communication device can be a component used to implement the functions of the terminal device. For example, the first communication device can be a unit / module, circuit, or chip within the terminal device. The method provided in the third aspect is described below using the first communication device as an example of the terminal device itself. Of course, the method provided in the third aspect can also be implemented by a unit / module, circuit, or chip within the terminal device.

[0032] The communication method includes: a terminal device receiving a first message from a network device, and sending a third message to the network device based on a dual-SIM reason, wherein the first message is used to configure a first carrier combination, and the third message is used to request the release of a first cell or a first cell group under the first carrier combination.

[0033] Accordingly, in a fourth aspect, embodiments of the present application provide a communication method that can be performed by a second communication device. The second communication device can be a terminal device, or the second communication device can be a component used to implement the functions of a network device. For example, the second communication device can be a unit / module, circuit, or chip within the network device. The method provided in the fourth aspect is described below using the second communication device as the network device itself as an example. Of course, the method provided in the fourth aspect can also be implemented by a unit / module, circuit, or chip within the network device.

[0034] The communication method includes: a network device sending a first message, and receiving a third message sent by a terminal device based on a dual-SIM reason. The first message is used to configure a first carrier combination. The third message is used to request the release of a first cell or a first cell group under the first carrier combination.

[0035] In the method provided in the third aspect or the fourth aspect, the terminal device requests the network device to release the first cell or the first cell group under the first carrier combination. The first cell or the first cell group refers to the first carrier combination. If the carrier combination currently configured by the terminal device is the first carrier combination, the network device does not use the first cell as a candidate secondary cell, or does not use the first cell group as a candidate secondary cell group. Compared with the current network device's default of not using the first cell as a candidate secondary cell for any carrier combination, or not using the first cell group as a candidate secondary cell group, the flexibility of the network device in configuring the terminal device can be improved, excessive restrictions on the frequency band / frequency of the terminal device can be reduced, and system performance can be improved.

[0036] In the implementation of the third aspect or the fourth aspect, when the third message is used to request the release of the first cell, the third message also indicates that the frequency band corresponding to the first cell is affected; or, when the third message is used to request the release of the first cell group, the third message also indicates that the frequency band corresponding to the main cell in the first cell group is affected.

[0037] In this solution, when the third message is used to request the release of the first cell, it also implicitly indicates that the frequency band corresponding to the first cell is affected / restricted, so that the network device no longer adds other cells located in the same frequency band as the first cell as SCell or SCG, so as to avoid the configuration of the terminal device exceeding the actual capability of the terminal device, thereby affecting the normal communication of the terminal device. Similarly, when the third message is used to request the release of the first cell group, it also implicitly indicates that the frequency band corresponding to the main cell in the first cell group is affected / restricted, so that the network device no longer adds other cells located in the same frequency band as the main cell in the first cell group as SCell or SCG, so as to avoid the configuration of the terminal device exceeding the actual capability of the terminal device, thereby affecting the normal communication of the terminal device.

[0038] In the implementation of the third aspect or the fourth aspect, the third message includes the identification information of the first cell and the index of the frequency band corresponding to the first cell; or, the third message includes the identification information of the first cell group and the index of the frequency band corresponding to the main cell in the first cell group.

[0039] In this solution, the third message can explicitly indicate the restricted frequency band of the terminal device, so that the network device can clearly understand whether the terminal device does not support any cell on the requested frequency band to be configured as SCell, or does not support the first cell on the requested frequency band to be configured as SCell, so as to reduce excessive suppression and improve system performance.

[0040] In the implementation of the third aspect, the method also includes: if the terminal device does not receive a response message from the network device to the message within a first time period after sending the third message, the terminal device stops communicating with the network device in the first cell or the first cell group, and the response message indicates the release or deactivation of the first cell or the first cell group.

[0041] It is understandable that if the terminal device requests to release or deactivate the first cell or the first cell group due to dual SIM card reasons, it can be considered that there is a resource conflict in the first cell or the first cell group. Therefore, even if the network device does not release or deactivate the first cell or the first cell group, the terminal device will not communicate with the network device in the first cell or the first cell group to reduce signaling waste.

[0042] In the implementation manner of the third aspect or the fourth aspect, the carrier combination currently configured by the terminal device is changed from the first carrier combination to the second carrier combination, and the third message becomes invalid.

[0043] In one possible implementation, the frequency band corresponding to at least one carrier in the second carrier combination is different from the frequency band corresponding to at least one carrier in the first carrier combination, or the frequency corresponding to at least one carrier in the second carrier combination is different from the frequency corresponding to at least one carrier in the first carrier combination.

[0044] In a possible implementation, when the frequencies of the carriers corresponding to the primary cells in the second carrier combination and the first carrier combination change, the third message becomes invalid.

[0045] In a possible implementation manner, the second carrier combination and the first carrier combination correspond to different frequency band combinations.

[0046] The failure of the third message can be understood as: the terminal device supports the first cell as a candidate secondary cell, or the terminal device supports the carrier on the frequency band corresponding to the first cell as a candidate secondary cell, or the terminal device supports the first cell group as a candidate secondary cell group, or the terminal device supports the carrier on the frequency band corresponding to the main cell in the first cell group as a candidate secondary cell group. In this solution, it can be assumed that the third message is for the currently configured carrier combination. If the currently configured carrier combination changes (for example, the currently configured first carrier combination is changed to the second carrier combination), the network device can use the first cell as a candidate secondary cell or the first cell group as a candidate secondary cell group. There is no need to indicate the failure of the third message through additional signaling, which can save signaling overhead.

[0047] In an implementation of the third aspect, the method further includes: the terminal device sending indication information to the network device, the indication information being used to indicate that the third message is invalid. Correspondingly, in an implementation of the fourth aspect, the method further includes: the network device receiving indication information sent from the terminal device, the indication information being used to indicate that the third message is invalid.

[0048] In this solution, the terminal device can explicitly indicate the invalidation of the third message through indication information, so that the network device can clearly know the invalidation of the third message, thereby configuring more reasonable parameters for the terminal device as much as possible to improve the system communication performance.

[0049] In the implementation manner of the third aspect or the fourth aspect, the indication information is used to indicate that the third message includes: the indication information is 1 bit, the value of the 1 bit is the first value, and the indication information indicates that the third message is invalid; or, the indication information does not include information of the first cell or the first cell group, indicating that the third message is invalid; wherein, the indication information is used to indicate the cell or cell group requested to be released under the first carrier combination; or, the indication information is a UAI message, the UAI message includes a first field, and the first field is used to indicate that the third message is invalid; or, the indication information is a UAI message, and when the UAI message does not include the first field, the UAI message is used to indicate that the third message is invalid.

[0050] In a fifth aspect, embodiments of the present application provide a communication method that can be performed by a first communication device. The first communication device can be a terminal device, or the first communication device can be a component used to implement the functions of the terminal device. For example, the first communication device can be a unit / module, circuit, or chip within the terminal device. The method provided in the fifth aspect is described below using the first communication device as the terminal device itself as an example. Of course, the method provided in the fifth aspect can also be implemented by a unit / module, circuit, or chip within the terminal device.

[0051] The communication method includes: the terminal device receives first indication information from the network device, the first indication information is used to indicate whether the terminal device is allowed to indicate capability limitation before entering the RRC connection state, and is used to indicate whether the terminal device is allowed to send UAI for temporary capability limitation, and the indication information is carried in SIB1.

[0052] Accordingly, in a sixth aspect, embodiments of the present application provide a communication method that can be performed by a second communication device. The second communication device can be a terminal device, or the second communication device can be a component used to implement the functions of a network device. For example, the second communication device can be a unit / module, circuit, or chip within the network device. The method provided in the sixth aspect is described below using the second communication device as the network device itself as an example. Of course, the method provided in the sixth aspect can also be implemented by a unit / module, circuit, or chip within the network device.

[0053] The communication method includes: the network device sends first indication information, which is used to indicate whether the terminal device is allowed to indicate capability limitation before entering the RRC connection state, and is used to indicate whether the terminal device is allowed to send UAI for temporary capability limitation, and the indication information is carried in SIB1.

[0054] In the method provided in the fifth aspect or the sixth aspect, the network device can simultaneously indicate through the first indication information in SIB1 that the terminal device is allowed to indicate capability limitation before entering the RRC connection state, and allow the terminal device to send UAI for temporary capability limitation. In this way, before receiving the RRC reconfiguration message, the terminal device can indicate the parameters of the limited capability to the network device through the UAI message. In this way, when the limited capability actually supported by the terminal device is greater than the capability corresponding to the current configuration, the network device can configure a stronger capability for the terminal device in advance (for example, the network device configures a higher number of MIMO layers or more CCs for the terminal device), which improves the flexibility of the network device configuration on the one hand, and improves the data transmission rate on the other hand.

[0055] In the implementation of the fifth aspect, the method further includes: the terminal device sends capability limitation indication information before entering the RRC connection state, the capability limitation indication information is carried in a first message, and the first message is an RRC connection establishment completion message, or an RRC recovery completion message, or an RRC re-establishment completion message; or, the terminal device sends third indication information before entering the RRC connection state, and the third indication information is carried in a first logical channel. Accordingly, in the implementation of the sixth aspect, the method further includes: the network device receives capability limitation indication information from the terminal device, the capability limitation indication information is carried in a first message, and the first message is an RRC connection establishment completion message, or an RRC recovery completion message, or an RRC re-establishment completion message; or, the network device receives third indication information from the terminal device, and the third indication information is carried in a first logical channel.

[0056] In the implementation manner of the fifth aspect or the sixth aspect, the capability limitation includes at least one of the following: the terminal device does not support CA / DC, and the terminal device does not support MIMO transmission.

[0057] In the implementation of the fifth aspect or the sixth aspect, whether the terminal device is allowed to send UAI for temporary capability restriction includes: whether the terminal device is allowed to send a first UAI, and the restricted capability indicated by the first UAI is independent of the currently configured carrier combination; or whether the terminal device is allowed to send a second UAI in the RRC establishment or recovery process, and the restricted capability indicated by the second UAI is based on the current RRC configuration, or the capability indicated by the second UAI is lower than the current RRC configuration.

[0058] In a seventh aspect, embodiments of the present application provide a communication method that can be performed by a first communication device. The first communication device can be a terminal device, or the first communication device can be a component used to implement the functions of the terminal device. For example, the first communication device can be a unit / module, circuit, or chip within the terminal device. The method provided in the seventh aspect is described below using the first communication device as the terminal device itself as an example. Of course, the method provided in the seventh aspect can also be implemented by a unit / module, circuit, or chip within the terminal device.

[0059] The communication method includes: a terminal device receiving first indication information and second indication information from a network device, wherein the first indication information is used to indicate whether the terminal device is allowed to indicate capability restriction before entering an RRC connected state. The second indication information is used to indicate whether the terminal device is allowed to send a UAI message for temporary capability restriction, and the indication information is carried in SIB1.

[0060] Accordingly, in an eighth aspect, an embodiment of the present application provides a communication method that can be performed by a second communication device. The second communication device can be a terminal device, or the second communication device can be a component used to implement the functions of the network device. For example, the second communication device can be a unit / module, circuit, or chip within the network device. The method provided in the eighth aspect is described below using the second communication device as the network device itself as an example. Of course, the method provided in the eighth aspect can also be implemented by a unit / module, circuit, or chip within the network device.

[0061] The communication method includes: a network device sending first indication information and second indication information. The first indication information is used to indicate whether the terminal device is allowed to indicate capability limitation before entering the RRC connected state. The second indication information is used to indicate whether the terminal device is allowed to send a UAI message for temporary capability limitation, and the indication information is carried in system information block (SIB) 1.

[0062] In the method of the seventh aspect or the eighth aspect, the second indication information is candidate service frequency information carried in an RRC reconfiguration message or an RRC recovery message, and the second indication information is used to indicate that the terminal device is allowed to send UAI for temporary capability restriction.

[0063] In the implementation manner of the seventh aspect or the eighth aspect, the capability limitation includes at least one of the following: the terminal device does not support CA / DC, and the terminal device does not support MIMO transmission.

[0064] In the implementation of the seventh aspect or the eighth aspect, whether the terminal device is allowed to send UAI for temporary capability restriction includes: whether the terminal device is allowed to send a first UAI, and the restricted capability indicated by the first UAI is independent of the currently configured carrier combination; or whether the terminal device is allowed to send a second UAI in the RRC establishment or recovery process, and the restricted capability indicated by the second UAI is based on the current RRC configuration, or the capability indicated by the second UAI is lower than the current RRC configuration.

[0065] In the ninth aspect, an embodiment of the present application provides a communication device, which has the function of implementing the behavior in the method example of any aspect from the first aspect to the eighth aspect above. The beneficial effects can be found in the relevant descriptions of the first aspect to the eighth aspect and will not be repeated here. For example, the communication device may be a terminal device in the first aspect, the third aspect, the fifth aspect or the seventh aspect. For another example, the communication device may be a device that can support the terminal device to implement the functions required by the method provided in the first aspect, the third aspect, the fifth aspect or the seventh aspect, for example, the communication device may be a chip or chip system in the terminal device. Alternatively, the communication device may be a network device in the second aspect, the fourth aspect, the sixth aspect or the eighth aspect. For another example, the communication device may be a device that can support the network device to implement the functions required by the method provided in the second aspect, the fourth aspect, the sixth aspect or the eighth aspect, for example, the communication device may be a chip or chip system in the network device.

[0066] In one possible design, the communication device includes a baseband device and a radio frequency device.

[0067] In one possible design, the communication device includes corresponding means (means) or modules for executing the method of any aspect from the first aspect to the eighth aspect. For example, the communication device includes a processing unit (sometimes also referred to as a processing module or processor) and / or a transceiver unit (sometimes also referred to as a transceiver module or transceiver). The transceiver unit can realize the sending function and the receiving function. When the transceiver unit realizes the sending function, it can be called a sending unit (sometimes also referred to as a sending module). When the transceiver unit realizes the receiving function, it can be called a receiving unit (sometimes also referred to as a receiving module). The sending unit and the receiving unit can be the same functional unit, which is called a transceiver unit, and the functional unit can realize the sending function and the receiving function; or, the sending unit and the receiving unit can be different functional units, and the transceiver unit is a general term for these functional units. These units (modules) can perform the corresponding functions in the method examples of any aspect from the first aspect to the eighth aspect above. Please refer to the detailed description in the method example for details, which will not be repeated here.

[0068] In a tenth aspect, an embodiment of the present application provides a communication device, which may be the communication device in the ninth aspect of the above-mentioned embodiment, or a chip or chip system provided in the communication device in the ninth aspect. The communication device includes a communication interface and a processor, and optionally, further includes a memory. The memory is used to store computer programs or instructions or data, and the processor is coupled to the memory and the communication interface. When the processor reads the computer program or instructions or data, the communication device executes the method executed by the terminal device in the above-mentioned method embodiment. For example, the communication device may be a terminal device or a functional module in the terminal device, such as a baseband chip and a radio frequency chip. Alternatively, when the processor reads the computer program or instructions or data, the communication device executes the method executed by the network device in the above-mentioned method embodiment. For example, the communication device may be a network device or a functional module in the network device, such as a baseband chip and a radio frequency chip.

[0069] In the eleventh aspect, an embodiment of the present application provides a chip system, which includes a processor and may also include a communication interface for implementing the method described in any of the first to eighth aspects. Optionally, the chip system also includes a memory. The memory is used to store computer programs (also referred to as codes, or instructions). The processor is used to call and run the computer program from the memory so that the device equipped with the chip system executes the method in any of the first to eighth aspects and any possible implementation thereof. The chip system can be composed of chips, and may also include chips and other discrete devices.

[0070] In a twelfth aspect, an embodiment of the present application provides a communication device, comprising an input / output interface and a logic circuit. The input / output interface is used to input and / or output information. The input / output interface can be an interface circuit, an output circuit, an input circuit, a pin, or related circuits. The logic circuit is used to execute the method described in any of aspects 1 to 8.

[0071] In a specific implementation, the communication device may be a chip, the input circuit may be an input pin, the output circuit may be an output pin, and the logic circuit may be a transistor, a gate circuit, a trigger, or various logic circuits. The input signal received by the input circuit may be, for example, but not limited to, received and input by a receiver, and the signal output by the output circuit may be, for example, but not limited to, output to and transmitted by a transmitter. The input circuit and the output circuit may be the same circuit, which functions as an input circuit and an output circuit, respectively, at different times. This application does not limit the specific implementation of the input and output interfaces and logic circuits.

[0072] In one implementation, when the communication device is a wireless communication device, the wireless communication device may be a terminal device such as a mobile phone, the interface circuit may be a radio frequency processing chip in the wireless communication device, and the processing circuit may be a baseband processing chip in the wireless communication device.

[0073] In a thirteenth aspect, an embodiment of the present application provides a communication system, comprising a terminal device and a network device. The terminal device is configured to implement the functions of the method described in the first aspect, and the network device is configured to implement the functions of the method described in the second aspect; or the terminal device is configured to implement the functions of the method described in the third aspect, and the network device is configured to implement the functions of the method described in the fourth aspect; or the terminal device is configured to implement the functions of the method described in the fifth aspect, and the network device is configured to implement the functions of the method described in the sixth aspect; or the terminal device is configured to implement the functions of the method described in the seventh aspect, and the network device is configured to implement the functions of the method described in the eighth aspect.

[0074] In the fourteenth aspect, an embodiment of the present application provides a computer-readable storage medium, which is used to store computer programs or instructions. When the computer-readable storage medium is executed, the method described in any aspect of the first to eighth aspects above and any possible implementation method thereof is implemented.

[0075] In the fifteenth aspect, an embodiment of the present application further provides a computer program product comprising instructions, which, when executed on a computer, enables the method described in any of the above-mentioned aspects 1 to 8 and any possible implementation thereof to be implemented.

[0076] The beneficial effects of the above-mentioned ninth to fifteenth aspects and their implementation methods can refer to the description of the beneficial effects of the first to eighth aspects and any possible implementation methods thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] FIG1 is a schematic diagram of a communication system applicable to an embodiment of the present application;

[0078] FIG2 is a flow chart of a communication method 200 provided in an embodiment of the present application;

[0079] FIG3 is a flow chart of a communication method 300 provided in an embodiment of the present application;

[0080] FIG4 is a flow chart of a communication method 400 provided in an embodiment of the present application;

[0081] FIG5 is a flow chart of a communication method 500 provided in an embodiment of the present application;

[0082] FIG6 is a schematic structural diagram of a communication device provided in an embodiment of the present application;

[0083] FIG7 is another schematic diagram of the structure of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0084] The embodiments of the present application provide a variety of communication methods, all of which are applicable to reporting when the terminal device has limited capabilities. The solutions provided by the embodiments of the present application are further described below with reference to the accompanying drawings.

[0085] The technical solutions provided in the embodiments of the present application can be applied to various wireless communication systems. For example, the methods provided in the embodiments of the present application can be applied to communication systems related to the 3rd Generation Partnership Project (3GPP), such as long term evolution (LTE) communication systems, sixth generation (5G) mobile communication systems, or mobile communication systems, or other similar communication systems. Other similar communication systems may include wireless fidelity (WIFI), vehicle to everything (V2X), internet of things (IoT) systems, narrowband internet of things (NB-IoT) systems, and the like.

[0086] Please refer to Figure 1, which shows a network architecture of a communication system. The network architecture may include at least one network device and at least one terminal device. Figure 1 takes at least one terminal device as a terminal device and at least one network device as an example. The network device may be an access network device, or the network device includes an access network device and a core network. The network architecture shown in Figure 1 is only a schematic, and the number of terminal devices and / or network devices may be less or more. The communication system described in the embodiment of the present application is to more clearly illustrate the technical solution of the embodiment of the present application, and does not constitute a limitation on the communication system to which the embodiment of the present application is applicable. It is known to those skilled in the art that with the evolution of network architecture, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems. When applying the technical solution of the embodiment of the present application to other communication systems, the devices, components, modules, etc. in the embodiment can be replaced with corresponding devices, components, modules in other communication systems without limitation.

[0087] The network devices involved in the embodiments of the present application are mainly access network devices. Therefore, in the following text, unless otherwise specified, the "network devices" referred to are radio access network (RAN) devices, which can be referred to as access network devices for short. RAN can be a 3GPP-related cellular system, for example, a 5G mobile communication system, or a future-oriented evolution system (such as a 6G mobile communication system). RAN can also be an open access network (open RAN, O-RAN or ORAN), a cloud radio access network (cloud radio access network, CRAN), or a virtualized radio access network (virtualized RAN, vRAN), etc. RAN can also be a communication system that is a fusion of two or more of the above systems. RAN devices can also be referred to as RAN nodes, RAN entities, or access nodes, etc.

[0088] In one possible scenario, a RAN node can be a base station, an evolved NodeB (eNodeB), an access point (AP), a transmission reception point (TRP), a next-generation NodeB (gNB), a next-generation base station in a 6G mobile communication system, or a base station in a future mobile communication system. A RAN node can be a macro base station, a micro base station, an indoor station, a relay node, a donor node / host node, or a wireless controller. A RAN node can also be a server, a wearable device, a vehicle, or an onboard device. For example, a RAN node in V2X technology can be a roadside unit (RSU).

[0089] In another possible scenario, the RAN node may be a module or unit that performs part of the functions of the base station; or multiple RAN nodes collaborate to assist terminal devices in achieving wireless access, and different RAN nodes respectively perform part of the functions of the base station. For example, the RAN node may be a centralized unit (CU), a distributed unit (DU), or a radio unit (RU). The functions of the CU may be implemented by one entity, or by different entities. For example, the functions of the CU may be further divided, that is, the control plane and the user plane may be separated and implemented by different entities, namely the control plane CU entity (i.e., CU-control plane (CP) entity) and the user plane CU entity (i.e., CU-user plane (UP) entity). The CU-CP entity and the CU-UP entity may be coupled with the DU to jointly perform the functions of the RAN node. The CU and DU may be set separately, or may be included in the same network element, such as the baseband unit (BBU).

[0090] In different systems, CU (or CU-CP and CU-UP), DU or RU may also have different names, but those skilled in the art can understand their meanings. For example, in the ORAN system, CU may also be called O-CU (Open CU), DU may also be called O-DU, CU-CP may also be called O-CU-CP, CU-UP may also be called O-CU-UP, and RU may also be called O-RU. For the convenience of description, this application uses CU, CU-CP, CU-UP, DU and RU as examples for description. Any unit of CU (or CU-CP, CU-UP), DU and RU in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0091] CU and DU can be configured according to the protocol layer functions of the wireless network they implement: for example, CU is configured to implement the functions of the packet data convergence protocol (PDCP) layer and above protocol layers (such as the radio resource control (RRC) layer and / or the service data adaptation protocol (SDAP) layer, etc.); DU is configured to implement the functions of the protocol layers below the PDCP layer (such as the radio link control (RLC), MAC layer, and / or physical (PHY) layer, etc.). For a detailed description of each of the above protocol layers, please refer to the relevant technical specifications of 3GPP or the technical specifications of other applicable communication protocols. The above division of the processing functions of CU and DU according to the protocol layer is only an example, and can also be divided in other ways, which is not limited by this application.

[0092] In the embodiments of the present application, the device for implementing the functions of the network device can be the network device itself, or a device that can support the network device to implement the functions, such as a chip system or a combination of devices or components that can implement the functions of the network device, and the device can be installed in the network device. The embodiments of the present application do not limit the specific technology and specific device form used by the network device.

[0093] In the embodiments of the present application, any device capable of performing data communication with a base station can be considered a terminal device. A terminal device is also referred to as a terminal, user equipment (UE), mobile station, or mobile terminal. Terminal devices can be widely used in various scenarios, such as D2D communication, V2X communication, machine-type communication (MTC), IoT, virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wearable, smart transportation, or smart city. For example, a terminal device can be: a mobile phone, a computer, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a robotic arm, a camera, a robot, or a smart home device (such as a TV, air conditioner, vacuum cleaner, speaker, set-top box), a relay, a customer premise equipment (CPE), etc.

[0094] The various terminal devices introduced above, if located on a vehicle (for example, placed / installed in a vehicle), can be considered as on-board terminal devices. The on-board terminal device can be an on-board module, on-board module, on-board component, on-board chip or on-board unit built into the vehicle as one or more components or units, and the vehicle can implement the method of the present application through the built-in on-board module, on-board module, on-board component, on-board chip or on-board unit. The on-board terminal device can be a complete vehicle device, an on-board module, a vehicle, an on-board unit (OBU), a roadside unit RSU, a vehicle-mounted system (or a vehicle-mounted sending unit) (telematics box, T-box), a chip or a system on chip (SOC), etc. The above chip or SOC can be installed in a vehicle, OBU, RSU or T-box.

[0095] In the embodiments of the present application, the device for implementing the functions of the terminal device can be the terminal device itself, or a device capable of supporting the terminal device in implementing the functions, such as a chip system or a combination of devices or components capable of implementing the functions of the terminal device, which can be installed in the terminal device. The embodiments of the present application do not limit the specific technology and specific device form used by the terminal device.

[0096] Different terminal devices may have different capabilities. Network devices will configure and schedule terminal devices based on their actual capabilities to ensure normal communication between the terminal devices and network devices. Typically, the capabilities of terminal devices remain constant, but in certain scenarios, they may change. For example, for a terminal device that supports multiple user identities, the capabilities of the terminal device will change as the user identity of the terminal device switches. To ensure that the network device's configuration of the terminal device does not exceed the actual capabilities of the terminal device, when a terminal device's capabilities change, the terminal device will report the changed capabilities to the network device.

[0097] The "user identity" here is a logical concept. For example, "user identity" can correspond to a SIM card or subscriber information or a virtual SIM card or a user identity (such as an international mobile subscriber identity (IMSI) or a temporary mobile subscriber identity (TMSI) or an embedded subscriber identity module (eSIM) or a multi-universal subscriber identity module (MUSIM), etc.). Different "user identities" logically correspond to different communication entities. For example, for the network side, a terminal device that supports two user identities can be regarded as two communication entities. For example, the user identity is a SIM card, and a terminal device that supports multiple SIM cards is a physical communication entity, but the network device will identify the terminal device that supports multiple SIM cards as multiple different communication entities, where one SIM card corresponds to one communication entity. In the embodiment of this application, the "user identity" corresponding to the SIM card will be mainly used as an example for explanation. In the embodiment of this application, terminal devices that support multiple user identities are collectively referred to as multi-card terminal devices.

[0098] Assume that a multi-card terminal device is installed with SIM card 1 and SIM card 2, and SIM card 1 and SIM card 2 share the radio frequency path of the terminal device. When SIM card 1 is in the RRC connected (RRC_CONNECTED) state, SIM card 2 is in the RRC idle (RRC_IDLE) state or the RRC inactive (RRC_INACTIVE) state. From the perspective of SIM card 1, when only SIM card 1 in the dual-card terminal device is in the RRC connected state, SIM card 1 can occupy all the capabilities of the dual-card terminal device. When SIM card 2 enters the RRC connected state from the RRC idle state or the RRC inactive state, SIM card 2 also needs to occupy part or all of the capabilities of the dual-card terminal device to achieve normal communication functions. Since SIM card 2 occupies part or all of the capabilities of the dual-card terminal device, the capabilities of SIM card 1 may change from occupying all the capabilities of the dual-card terminal device to occupying part of the capabilities of the dual-card terminal device, that is, the capabilities of SIM card 1 are restricted / suppressed. In this case, SIM card 1 needs to notify the network device of the temporary capacity restriction of SIM card 1 so that the network device's configuration and scheduling of SIM card 1 match SIM card 1's actual capacity, avoiding the network device's configuration of SIM card 1 exceeding SIM card 1's actual capacity, which would cause the multi-card terminal device to be unable to communicate normally. SIM card 1 in the RRC connected state reports temporary capacity restriction to the network device due to SIM card 2 entering the RRC connected state. This can be understood as SIM card 1 passively reporting temporary capacity restriction to the network device or SIM card 1 passively having its capacity restricted.

[0099] In contrast, in some scenarios, the SIM card needs to actively report to the network device that its capabilities are temporarily restricted. For example, from the perspective of SIM card 1, when only SIM card 2 in the dual-card terminal device is in the RRC connected state, SIM card 2 occupies part or all of the capabilities of the dual-card terminal device. When SIM card 1 enters the RRC connected state from the RRC idle state or the RRC inactive state, since SIM card 2 occupies part or all of the capabilities of the dual-card terminal device, SIM card 1 cannot occupy all the capabilities of the dual-card terminal device. In this case, SIM card 1 needs to inform the network device that the capabilities of SIM card 1 are temporarily restricted. SIM card 1, which is about to enter the RRC connected state, reports to the network device that its capabilities are temporarily restricted because SIM card 2 is in the RRC connected state. This can be understood as SIM card 1 actively reporting to the network device that its capabilities are temporarily restricted or SIM card 1 actively has its capabilities restricted.

[0100] The capabilities of the terminal device include but are not limited to one or more of the following: supported frequency bands (bands), supported frequency band combinations (band combinations, BCs), supported secondary cells (SCells), supported number of component carriers (CCs), supported maximum number of multiple-input multiple-output (MIMO) layers, and measurement interval capabilities, etc. The frequency band combination can be used to express the carrier aggregation (CA) and dual connectivity (DC) capabilities supported by the UE. Among them, the frequency band can also be called a frequency band, and each frequency band corresponds to a frequency range. Each frequency band in each frequency band combination may include one or more continuous or non-continuous carriers. In an embodiment of the present application, a frequency band may also be a frequency / frequency point. For example, in an embodiment of the present application, at least one frequency band of an SCell or SCG may be replaced by at least one frequency of an SCell or SCG.

[0101] Carrier aggregation refers to the simultaneous provision of services to terminal devices via multiple carriers. By aggregating multiple CCs to provide services to terminal devices simultaneously, communication bandwidth can be increased and peak rates can be improved. Each carrier can have at least one serving cell component carrier operating for terminal devices. In carrier aggregation technology, one carrier is usually the primary CC (PCC) or the primary cell (PCell), and the other carriers are secondary CCs (SCCs) or Scells. Scells can be activated or deactivated during use. For example, if there is no data transmission for a period of time, the network can deactivate the Scell ​​and reactivate it when data is sent later.

[0102] Carrier aggregation is categorized as intra-band carrier aggregation and multi-band (or band combination) carrier aggregation. Intra-band carrier aggregation refers to the aggregation of multiple carriers within a single frequency band (also called a frequency band), while multi-band carrier aggregation refers to the aggregation of multiple carriers across multiple bands. For example, in a band combination consisting of bands A, B, and C, there is one carrier on band A, two carriers on band B, and two carriers on band C. Band combination carrier aggregation involves aggregating one carrier on band A, two carriers on band B, and two carriers on band C.

[0103] Dual connectivity refers to a terminal device connecting to multiple network devices to enhance wireless network cellular cell connectivity. The purpose of dual connectivity is to utilize the wireless resources of multiple carriers to improve the throughput of terminal devices. Dual connectivity can configure a terminal device in RRC connected mode (RRC connected) with multiple receive / transmit (Rx / Tx) functions to use the wireless resources of two base stations and two different scheduling processes. These two base stations are backhauled via non-direct links on the X2 interface. Dual connectivity allows terminal devices to simultaneously send and receive signals on multiple carriers in two cell groups through a primary base station and a secondary base station.

[0104] The capabilities of terminal devices can be divided into several levels, including but not limited to: frequency band combination level capabilities, per-frequency band combination per-frequency band level capabilities, carrier level capabilities, etc.

[0105] Band combination-level capability (also known as BC-level capability or per BC capability) is a capability related to the band combination. The band combination is mainly related to the CA and DC capabilities supported by the terminal device. A band combination can be composed of one or more bands and carriers included in the bands that are supported by the terminal device for carrier aggregation or dual connectivity. That is, for a band combination reported by the terminal device, the network device can configure the carriers included in the bands in the band combination to the terminal device for carrier aggregation or dual connectivity transmission. The band combination supported by the terminal device is usually related to the RF capability and baseband capability of the terminal device.

[0106] Per-band per-band capability (also known as perBCperband capability) is the capability for a specific band within a BC and is typically related to the RF capabilities of the terminal device. PerBCperband capability is associated with a feature set (FS) parameter that characterizes the capability, also known as perFS capability.

[0107] Carrier-level capability (also known as per CC capability) is the capability of the component carrier on the frequency band in the frequency band combination. In the per CC capability information, each component carrier is associated with a feature set per CC (FSPC) to indicate the capability of the corresponding component carrier. Therefore, per CC capability is also called FeatureSetPerCC capability. Each FSPC includes a FeatureSetDownlinkPerCC information element for reporting downlink transmission capability and a FeatureSetUplinkPerCC information element for reporting uplink transmission capability, which are used to indicate the uplink transmission capability and downlink transmission capability of the terminal device respectively.

[0108] Fallback band combination: A band combination created by releasing at least one SCell or SCell uplink configuration, secondary cell group (SCG), or supplementary uplink carrier (SUL) from another band combination. This band combination is the parent band combination (BC) of the fallback band combination. For example, BC 1 includes bands A, B, and C; if BC 2 includes bands A and B, then BC 2 is the fallback BC for BC 1.

[0109] Because the protocol defines numerous frequency bands and frequency band combinations, to save signaling overhead, the standard allows terminal devices to omit the ability to report a fallback BC with the same capabilities as the parent BC when reporting frequency band combination capabilities. If the fallback BC has different capabilities (i.e., higher capabilities) than the parent BC, the terminal device can report the fallback BC.

[0110] When a terminal device's proactive reporting capability is temporarily limited, it can indicate the affected frequency, frequency band, or bandwidth to the network device. Based on the terminal device's indication, the network device will not configure the affected frequency and bandwidth for the terminal device. For example, if the terminal device indicates that the affected frequency is {A, B}, the network device will not configure {A, B} for the terminal device. If the terminal device indicates that the affected frequency band is {bandA}, the network device will not configure {bandA} for the terminal device.

[0111] However, the same frequency or the same frequency band is affected differently in different frequency band combinations. That is to say, the same frequency or the same frequency band is affected in some frequency band combinations, but not in other frequency band combinations. When the understanding of the network equipment and the terminal equipment is inconsistent, the network configuration will exceed the limited capabilities, resulting in abnormalities such as bit errors and reconstruction, or the network will over-restrict the capabilities of the terminal equipment, resulting in lower communication performance and information transmission rate. For example, the terminal device believes that the indicated frequency band / frequency is affected under some carrier combinations, but the network device defaults to any frequency band combination. The frequency band / frequency indicated by the terminal device is affected, then the network device will not configure any frequency band combination that includes this frequency band / frequency, which will result in excessive suppression of the terminal device's capabilities and affect system performance.

[0112] For example, the affected frequency band indicated by the terminal device is band C. Assume that in the combination {bandA+bandB+bandC}, band C is affected; in the combination {bandA+bandC}, band C is unaffected. Currently, network devices do not configure any frequency band combination that includes band C for terminal devices. For example, network devices do not configure the combination {bandA+bandB+bandC} or {bandA+bandC} for terminal devices. However, in the combination {bandA+bandC}, band C is unaffected. Therefore, configuring {bandA+bandC} on the network device does not exceed the capabilities of the terminal device. Therefore, the network device assumes that the frequency band / frequency indicated by the terminal device is affected regardless of the frequency band combination, which can lead to excessive suppression of the terminal device's capabilities and affect system performance.

[0113] In view of this, a first communication method is proposed in an embodiment of the present application. In this method, a terminal device indicates to a network device the affected frequency bands / frequencies under a certain frequency band combination. Accordingly, based on the terminal device's indication, the network device does not configure the frequency band / frequency for the terminal device under that frequency band combination; however, it may configure the frequency band / frequency for the terminal device under another frequency band combination. This method allows the network device to configure frequency bands or frequency band combinations for the terminal device with greater flexibility, reduces excessive suppression of the terminal device's capabilities, and improves system performance.

[0114] When the passive reporting capability of the terminal device is temporarily limited, it can request the network device to release a specific SCell or SCG, and at least one frequency of the specific SCell or SCG is affected. The network device will release the specific SCell or SCG in response to the request of the terminal device. When the channel quality of one or some frequency points of the specific SCell or SCG is good in the measurement results reported by the terminal device to the network device, the network device will again use the specific SCell as a candidate SCell, or, again use the specific SCG as a candidate SCG, so that the terminal device will again request the network device to release the specific SCell or SCG. This repetitive process increases signaling overhead and also affects the system performance of the terminal device.

[0115] In view of this, a second communication method is proposed in an embodiment of the present application. In this method, a terminal device can request the network device to release a specific SCell or SCG under a certain carrier combination. As long as the terminal device is currently configured under this carrier combination, the network device will not add the specific SCell as a candidate SCell or the specific SCG as a candidate SCG. This method can avoid the terminal device frequently indicating to the network device that its capabilities are temporarily limited, saving signaling overhead and improving system performance.

[0116] The technical solutions provided by the embodiments of the present application are described below in combination with the above content and the accompanying drawings.

[0117] The method provided in the embodiment of the present application can be applied to a terminal device that supports at least two user identities. The terminal device that supports two user identities is, for example, a terminal device that supports dual SIM dual active (DSDA) or a terminal device that supports dual SIM dual receive single send (DR-DSDS).

[0118] In the embodiments of the present application, "due to dual-SIM reasons (for MUSIM propose)" has the following meanings: the terminal device is a multi-SIM terminal device, the terminal device operates in dual-SIM mode, the terminal device operates simultaneously as multiple users, or the terminal device is about to operate simultaneously as multiple users, etc. The method provided in the present application is also applicable in these cases. Therefore, "due to dual-SIM reasons" in the present application can be replaced with the above meaning description. "Affected" can also be replaced by: "restricted / limited", "prohibited", "supported" or "unsupported configuration", etc. For example, the affected frequency band can be replaced by an unsupported frequency band, a frequency band that does not support configuration, a prohibited frequency band or a restricted frequency band, etc.

[0119] In the embodiments of this application, "when," "if," and "if" all indicate that the device will perform a corresponding action under certain objective circumstances. They do not limit the time, do not require the device to perform a judgment action when implemented, and do not imply any other limitations. Unless otherwise specified, "if" and "if" are interchangeable, and "when" and "under the circumstances" are interchangeable. "When" and "if" are interchangeable.

[0120] In the communication methods provided in the embodiments of the present application (for example, communication methods 200 to 500), the steps performed by the network device may be implemented by the RAN device itself, or by components in the RAN device (such as a baseband chip, or other processing units or processor modules). For example, the network device may be the network device in 1, or it may be a chip (system) in the network device in FIG1 . The steps performed by the terminal device may be implemented by the terminal device itself, or by components in the terminal device (such as a chip, a processing unit, or a processor module). The terminal device may be the terminal device shown in FIG1 , or it may be a chip (system) in the terminal device in FIG1 .

[0121] Please refer to Figure 2, which shows a flow chart of a communication method 200 provided in an embodiment of the present application. For example, Figure 2 takes the communication method 200 executed by a network device and a terminal device as an example to introduce the method from the perspective of interaction between the network device and the terminal device. It should be understood that the communication method 200 can also be implemented by other devices, such as a chip or communication device with communication functions. The communication method 200 takes the case where the active capability of the terminal device is limited as an example. As shown in Figure 2, the process of the communication method 200 includes the following steps.

[0122] S201. A network device sends a first message to a terminal device, where the first message is used to configure a first carrier combination.

[0123] Accordingly, the terminal device receives a first message from the network device. The first message can be used to configure the first carrier combination. The embodiment of the present application does not limit the signaling that carries the first message. For example, the first message can be carried in an (RRC reconfiguration) message or an RRC resume (RRC resume) message, or the first message is an RRC reconfiguration message or an RRC resume message.

[0124] The first carrier combination is the carrier combination currently configured by the network device for the terminal device. The network device configures the first carrier combination for the terminal device via the first message and deems the terminal device's currently configured carrier combination to be the first carrier combination. The terminal device confirms, based on the first message, that the currently configured carrier combination is the first carrier combination.

[0125] The cell corresponding to the carrier in the first carrier combination can be understood as the service cell configured by the network device for the terminal device. Therefore, the first message is used to configure the first carrier combination, which can be replaced by the first message being used to configure at least one service cell of the terminal device. The cell corresponding to the carrier in the first carrier combination can be a cell in a cell group (cell group) or a cell across cell groups. For example, in the DC scenario, the first carrier combination includes cells in the master cell group (MCG) and the SCG.

[0126] S202. The network device sends a second message to the terminal device. The second message includes information about a candidate service frequency. The candidate service frequency is the frequency of a candidate SCell or a candidate SCG under the first carrier combination.

[0127] Correspondingly, the terminal device receives a second message from the network device. In addition to configuring the first carrier combination for the terminal device, the network device may also configure the frequency / frequency band of the candidate SCell based on the first carrier combination for the terminal device, or the frequency / frequency band of the candidate SCG based on the first carrier combination for the terminal device. The frequency / frequency band of the candidate SCell can also be referred to as the candidate frequency / candidate frequency band of the SCell; the frequency / frequency band of the candidate SCG can also be referred to as the candidate frequency / candidate frequency band of the SCG. For example, the cells corresponding to the carriers in the first carrier combination are PCell and SCell#1, PCell belongs to bandA, and SCell#1 belongs to bandB. The network device may add bandC and bandD as candidate frequency bands for the SCell / SCG, then the second message may indicate bandC and bandD. For another example, the cells corresponding to the carriers in the first carrier combination are PCell and SCell#1, PCell is located at frequency A, and SCell#1 is located at frequency B. The network device may add frequency C and frequency D as candidate frequencies for the SCell / SCG, then the second message may indicate frequency C and frequency D.

[0128] For the candidate frequencies of the SCell or SCG, the second message may include an absolute radio-frequency channel number (ARFCN) to indicate the frequency of the candidate SCell or candidate SCG. Continuing with the above example, the second message may include the ARFCN of frequency C and the ARFCN of frequency D. For the candidate frequency bands of the SCell or SCG, the second message may include the frequency band number (frequency band number) or the frequency band index (index) of the candidate frequency band of the SCell or SCG. Continuing with the above example, the second message may include the frequency band number or index of bandC and the frequency band number or index of bandD. In one implementation, the second message may include the information element "FreqBandIndicatorNR" to indicate the frequency / frequency of the candidate SCell / SCG of the first carrier combination to the terminal device through FreqBandIndicatorNR.

[0129] Step S202 is optional and not a mandatory step, and is indicated by a dashed line in FIG2 . That is, if the network device does not provide the terminal device with a candidate service frequency, the terminal device may also perform other steps in the embodiments of the present application. For example, instead of performing S202, S203 may be performed.

[0130] S203. The terminal device sends first information to the network device. The first information is used to indicate a first frequency band. The first frequency band is a frequency band that is not supported in the first carrier combination due to dual-SIM reasons.

[0131] Accordingly, the network device receives the first information from the terminal device, and the first information may indicate the frequency band that the terminal device does not support under the first carrier combination due to dual card reasons. As mentioned above, due to dual card reasons (for MUSIM purpose), some capabilities of the terminal device may be limited. For example, the terminal device may not support some frequencies or frequency bands, that is, some frequencies / frequency bands originally supported by the terminal device may be affected. In order to ensure that the frequency / frequency band configured by the network device for the terminal device does not exceed the frequency / frequency band supported by the terminal device, the terminal device may indicate to the network device through the first information that the terminal device does not support the frequency band under the first carrier combination due to dual card reasons. For convenience of description, this article takes the frequency band that the terminal device does not support under the first carrier combination due to dual card reasons as the first frequency band as an example. Among them, the first frequency band can be at least one frequency or at least one frequency range. In an embodiment of the present application, it can be assumed that the first information is for the currently configured carrier combination. Therefore, the first information does not need to carry information about the currently configured carrier combination (i.e., the first carrier combination). For example, the first information does not need to carry the index of the first carrier combination, which can save signaling overhead.

[0132] The terminal device is due to dual-card reasons, which can be understood as the terminal device being a multi-card terminal device, the terminal device working in dual-card mode, the terminal device working simultaneously as multiple users, or the terminal device is about to work simultaneously as multiple users, etc. As mentioned above, due to dual-card reasons, some capabilities of the terminal device will be limited. For example, the terminal device may not support some frequencies or frequency bands, that is, some frequencies / frequency bands will be limited. "Limited" here can also be understood as "affected, prohibited, not supported or configured, etc.". Affected / restricted frequency bands can also be understood as frequency bands with resource conflicts. For example, the first frequency band being affected / restricted can be understood as the first frequency band having a resource conflict.

[0133] The first frequency band that the terminal device does not support in the first carrier combination due to dual SIM reasons may include (or may be replaced by): the terminal device does not support at least one frequency band configured as an SCell or SCG in the first carrier combination due to dual SIM reasons. The frequency band that the terminal device does not support is a frequency band that the terminal device does not want the network device to add as an SCell or SCG. From this perspective, the first information indicating that the terminal device does not support the first frequency band in the first carrier combination due to dual SIM reasons can be replaced by: the first information indicating that the terminal device does not prefer to add the first frequency band as an SCell or SCG in the first carrier combination due to dual SIM reasons; or the first information indicating that the terminal device does not expect / support to add the first frequency band as an SCell or SCG in the first carrier combination due to dual SIM reasons; or the first information indicating that the terminal device requests to suppress the first frequency band in the first carrier combination due to dual SIM reasons; or the first information indicating that the terminal device is prohibited in the first carrier combination due to dual SIM reasons; or the first information indicating that the terminal device is affected / restricted in the first carrier combination due to dual SIM reasons; or the first information indicating that the terminal device does not support communication in the SCell or SCG in the first frequency band due to dual SIM reasons. In one scenario, the at least one frequency / frequency band may not have been configured as an SCell or SCG, and the terminal device requests not to add the carrier on the at least one frequency band / frequency as an SCell or / SCG in addition to the first carrier combination.

[0134] The terminal device does not support at least one frequency band configured as SCell or SCG in the first carrier combination due to dual-card reasons. It can also be understood that: the terminal device does not support at least one frequency band of the affected SCell or SCG in the first carrier combination due to dual-card reasons. The affected SCell or SCG is the cell corresponding to the carrier in the first carrier combination. The affected cell can also be understood as a cell with resource conflicts, or a cell that the terminal device expects or requests the network device to release. In this case, the cell corresponding to the at least one frequency band indicated by the first information is at least one cell in the currently configured service cell.

[0135] Alternatively, the terminal device does not support at least one frequency band configured as an SCell or SCG under the first carrier combination due to dual-card reasons. It can also be understood that: the terminal device requests the network device to release at least one frequency band of the SCell or SCG under the first carrier combination due to dual-card reasons, and the SCell or SCG requested to be released is the cell corresponding to the carrier in the first carrier combination. In this case, the cell corresponding to the at least one frequency band indicated by the first information belongs to the currently configured service cell.

[0136] The first information may include information about the first frequency band. If the network device is configured with candidate service frequencies, the first frequency band includes at least one frequency among the candidate service frequencies or at least one frequency among the frequencies corresponding to the first carrier combination. The first frequency band can be replaced with the first frequency, and the first information may be the ARFCN of the first frequency. The first information may also be the frequency band number, index, or identifier of the first frequency band; or, the first information may include the ARFCN of the center frequency of the first frequency band and a bandwidth to indicate the frequency band range in which the first frequency band is located. When the first frequency band is a plurality of frequency bands, the first information may include the frequency band numbers, indexes, or identifiers of the plurality of frequency bands; or, the first information may include multiple groups of center frequencies and a bandwidth, wherein a group of center frequencies and corresponding bandwidths indicate a frequency band.

[0137] The embodiments of the present application do not limit the signaling that carries the first information. For example, the first information may be carried in an RRC message and / or a MAC CE. In one implementation, the first information may be "FreqBandIndicatorNR" to indicate the first frequency band. For another example, the first information may be carried in a UAI message. Optionally, the UAI message is a UAI for multiple cards.

[0138] For example, take the case where the first carrier combination is {bandA+bandB} or the currently configured serving cell is a cell on {bandA+bandB}, and the terminal device does not support {bandA+bandB+bandC} due to dual-SIM reasons. Due to dual-SIM reasons, the terminal device does not support bandC under {bandA+bandB}; or, due to dual-SIM reasons, the terminal device does not support adding cells of bandC as SCells or SCGs based on the currently configured serving cell; or, the terminal device does not support using cells of bandC as candidate SCells or SCGs based on the currently configured serving cell. The first information may include information on bandC to indicate that the terminal device does not support the frequency of bandC configured as SCell / SCG on the currently configured serving cell due to dual-SIM reasons.

[0139] It should be noted that the first frequency band indicated by the first information is for the first carrier combination (i.e., the currently configured carrier combination). For other carrier combinations, the terminal device may support the first frequency band or may not support the first frequency band. For example, the first information includes information indicating that bandC is based on the configuration of {bandA+bandB} and does not support adding the cell with bandC as an SCell or SCG; while for {bandA}, it may support adding the cell with bandC as an SCell or SCG (i.e., it may support the configuration of {bandA+bandC}), or it may support configuring bandC as a PCell. In addition, "the first information indicates that the terminal device does not support the first frequency band under the first carrier combination due to dual-card reasons" means "the first information indicates that the terminal device does not support all frequencies or frequency bands included in the first frequency band being configured at the same time under the first carrier combination due to dual-card reasons." That is, when the first frequency band is multiple frequencies or multiple frequency bands, the first information indicates that these multiple frequencies or multiple frequency bands cannot be added as frequencies / frequency bands of SCell / SCG at the same time. For example, the first carrier combination is {bandA}, and the configurations not supported by the terminal device include {bandA+bandB+bandC}. The first information includes information about bandB and bandC; however, the terminal device can support the configurations {bandA+bandB} or {bandA+bandC}. Therefore, the network device can configure {bandA+bandB} or {bandA+bandC} for the terminal device. Compared to the network device assuming that the terminal device does not support bandC due to dual SIM card issues and not configuring any carrier combination including bandC for the terminal device, S203 can increase the flexibility of the network device in configuring carrier combinations, reduce excessive suppression of terminal device capabilities, and improve system performance.

[0140] S204: The terminal device sends second information to the network device, where the second information indicates a second frequency band and a capability parameter corresponding to the second frequency band, where the second frequency band is a frequency band restricted under the first carrier combination due to dual SIM card issues. Accordingly, the network device receives the second information from the terminal device.

[0141] Due to dual SIM card issues, the capabilities of the terminal device may be temporarily limited. To prevent the network device from configuring the terminal device beyond the actual capabilities of the terminal device, the terminal device may report specific capability parameters corresponding to the terminal device to the network. For example, the frequency band with limited / affected capabilities is the second frequency band, which may be an affected frequency band or an affected cell. The capability parameters corresponding to the second frequency band may include at least one of limited downlink (DL) / uplink (UL) MIMO layer capability and the number of DL / UL carriers.

[0142] The second information may include information about the second frequency band and a capability parameter corresponding to the second frequency band. The information about the second frequency band includes the frequency band number or identifier of the second frequency band. The capability parameter corresponding to the second frequency band may be a capability parameter of a carrier of the second frequency band. The carrier of the second frequency band may be a continuous carrier on the second frequency band. Exemplarily, if the terminal device indicates that the number of DL MIMO layers restricted by the second frequency band is 2MIMO, then the number of DL MIMO layers of each carrier on at least one continuous carrier included in the second frequency band is 2MIMO. If intra-band non-continuous carrier aggregation is supported within a frequency band, the restricted capability of the non-continuous carrier is indicated by different second frequency bands. For example, CA_n41A-A is a carrier aggregation of two non-continuous single carriers on frequency band n41, then the terminal device reports the restricted capability of two bands n41 (second frequency band) and the carriers corresponding to each band n41.

[0143] The capability corresponding to the above capability parameters is lower than the configuration of the current network or is based on the configuration of the current network, or the capability corresponding to the above capability parameters is a passively restricted capability. For example, for the terminal device, the maximum number of MIMO layers supported on carrier 1 is 4, and the number of MIMO layers of carrier 1 configured by the current network is 2. The second information may indicate that the number of MIMO layers of carrier 1 currently supported by the terminal device is 1. In this case, the number of MIMO layers supported by the terminal device is less than the number of MIMO layers currently configured by the network, indicating that the configuration of the network has exceeded the capability of the terminal device and the capability of the terminal device is limited. Alternatively, the capability corresponding to the above capability parameters may also be greater than or equal to the configuration of the current network, or the capability corresponding to the above capability parameters is an actively restricted capability. In possible scenarios, the network device has not yet configured the terminal device with a carrier of the second frequency band, or a frequency band combination related to the second frequency band, or an SCell or SCG of the second frequency band, and the terminal device may also send the second information.

[0144] The embodiment of the present application does not limit the signaling carried by the second information. For example, the second information can be carried in an RRC message and / or a MAC CE. For another example, the second information can be carried in a UAI message.

[0145] In one implementation, the first information and the second information can be carried in one signaling. For example, the first information and the second information can be carried in different fields / elements of the same signaling; or the first information and the second information can be carried in the same field of the same signaling. Alternatively, the first information and the second information can be independent, that is, the first information is carried in one signaling, and the second information is carried in another signaling. The terminal device can send the first information but not the second information; or the terminal device can send the second information but not the first information; or the terminal device can send the first information and the second information. Figure 2 takes the example of the terminal device sending the first information, and S204 is an optional step, which is illustrated by a dotted line in Figure 2.

[0146] Based on the first information and / or the second information, the network device can clearly identify the restricted frequencies / frequency bands of the terminal device under the currently configured carrier combination. In this way, the network device and the terminal device have the same understanding of the restricted capabilities of the terminal device, which can avoid the network configuration exceeding the restricted capabilities, resulting in errors, reconstruction and other anomalies, or the network excessively restricting the capabilities of the terminal device, thereby ensuring higher communication performance and information transmission rate.

[0147] It can be understood that the first information is for the currently configured carrier combination. If the carrier combination currently configured by the terminal device is changed from the first carrier combination to the second carrier combination, the first information becomes invalid. The failure of the first information can also be understood as: the first frequency band is not restricted / not affected, or the first frequency band releases capability restrictions / suppression. The failure of the first information indicates that the terminal device has restored the ability to configure the cell corresponding to the first frequency band as an SCell / SCG. When the first information fails, the first frequency band can be added as an SCell / SCG under the second carrier combination. The failure of the first information can be replaced by the release of restricted capability or the release of capability restrictions.

[0148] Similarly, the second information is for the currently configured carrier combination. If the carrier combination currently configured by the terminal device is changed from the first carrier combination to the second carrier combination, the second information becomes invalid. The invalidation of the second information indicates that the terminal device has restored its capabilities in the second frequency band, such as restoring the ability to support the number of MIMO layers in the second frequency band. When the second information becomes invalid, the capabilities supported on the second frequency band under the second carrier combination are the same as the capabilities reported in the terminal device capability information. For example, the number of MIMO layers supported by the carrier on the second frequency band is the same as the number of supported MIMO layers reported in the terminal device capability information. The invalidation of the second information can be replaced by the release of restricted capabilities or the release of capability restrictions.

[0149] Among them, the currently configured carrier combination is changed from the first carrier combination to the second carrier combination, including: the second carrier combination and the first carrier combination correspond to different frequency band combinations; or, the frequency band corresponding to at least one carrier in the second carrier combination is different from the frequency band corresponding to at least one carrier in the first carrier combination, or, the frequency corresponding to at least one carrier in the second carrier combination is different from the frequency corresponding to at least one carrier in the first carrier combination; or, the frequency of the carrier corresponding to the primary cell in the second carrier combination and the first carrier combination changes.

[0150] In one implementation, a change in the carrier combination or frequency band combination configured by the network device may be defaulted to invalidate the first information and / or the second information. Changes in the configured carrier combination or frequency combination include: a change in the frequency / band of the PCell, which can be replaced by a terminal device handover; a change in the frequency / band of the SCell / SCG; or the addition / deletion of an SCell or SCG by the network.

[0151] In another implementation, if the currently configured carrier combination changes, the terminal device may indicate to the network device that the first information is invalid. For example, the communication method 200 further includes S205. S205 is an optional step, not a required step, and is illustrated by a dotted line in FIG2 .

[0152] S205. The terminal device sends indication information to the network device, where the indication information is used to indicate that the first information is invalid.

[0153] Accordingly, the network device receives indication information from the terminal device, and the indication information may indicate that the first information is invalid. This application does not limit how the indication information indicates that the first information is invalid. For example, the indication information may indicate that the first information is invalid in any of the following implementations.

[0154] In implementation mode 1, the indication information is 1 bit, the value of the 1 bit is a first value, and the indication information indicates that the first information is invalid. The first value can be 0 or 1.

[0155] In a second implementation mode, the indication information is used to indicate a frequency band that is not supported under the first carrier combination. When the indication information does not include information about the first frequency band, the first information is invalid.

[0156] Each time the frequency information sent by the terminal device to the network device indicates that under the carrier combination currently configured by the terminal device, the unsupported frequency information does not include information about a certain frequency / frequency band, indicating that the frequency / frequency band has lifted the capability restriction. For example, under the first carrier combination, the unsupported frequency bands include three frequency bands: frequency band A, frequency band B, and frequency band C. When the indication information includes the respective information of frequency band A, frequency band B, and frequency band C, it indicates that frequency band A, frequency band B, and frequency band C are restricted; when the indication information includes the information of frequency band A and frequency band B, and the first frequency band is frequency band C, the indication information indicates that frequency band A and frequency band B are not supported under the first carrier combination, and support for frequency band C is restored, that is, the indication of the first information is invalid.

[0157] Implementation method three: the indication information is a UAI message, and the UAI message includes a first field, and the first field is used to indicate that the first information is invalid.

[0158] For example, the first field is a prohibited field in the UAI message, which is used to carry information about the first frequency band that is not supported by the terminal device under the currently configured first carrier combination due to dual-card reasons. When the first field does not carry information about the first frequency band, the UAI message indicates that the first information is invalid, that is, it indicates that the capability restriction of the first frequency band is lifted. For example, the unsupported frequency bands under the first carrier combination include three frequency bands: frequency band A, frequency band B, and frequency band C. When the indication information includes information about frequency band A, frequency band B, and frequency band C respectively, it indicates that frequency band A, frequency band B, and frequency band C are restricted; when the indication information does not include any frequency, it indicates that support for frequency band A, frequency band B, and frequency band C is restored, that is, it indicates that the first information is invalid.

[0159] Implementation method four: the indication information is a UAI message, the UAI message does not include the first field, and the UAI message is used to indicate that the first information is invalid.

[0160] For example, the first field is a prohibited field in the UAI message, which is used to carry information about the first frequency band that the terminal device does not support under the currently configured first carrier combination due to dual SIM card reasons. When the UAI message does not include the first field, the UAI message indicates that the first information is invalid.

[0161] In the communication method 200, the terminal device indicates to the network device the frequency band whose capabilities are limited under the currently configured carrier combination due to dual SIM card reasons. Accordingly, the network device does not configure the frequency band for the terminal device under the currently configured carrier combination according to the instruction of the terminal device; under other carrier combinations, the network device can configure the frequency band for the terminal device. Through the communication method 200, the frequency band or frequency band combination configured by the network device for the terminal device is more flexible, and can reduce excessive suppression of the terminal device's capabilities and improve system performance. In addition, the terminal device only reports the limited capabilities for the currently configured carrier combination, which reduces the signaling overhead of the terminal device reporting the limited capabilities and also reduces the implementation complexity of the terminal device.

[0162] Please refer to Figure 3, which shows a flow chart of a communication method 300 provided in an embodiment of the present application. For example, Figure 3 takes the communication method 300 executed by a network device and a terminal device as an example to introduce the method from the perspective of interaction between the network device and the terminal device. It should be understood that the communication method 300 can also be implemented by other devices, such as a chip or communication device with communication functions. The communication method 300 takes the passive capability of the terminal device as an example. As shown in Figure 3, the process of the communication method 300 includes the following steps.

[0163] S301. A network device sends a first message to a terminal device, where the first message is used to configure a first carrier combination.

[0164] Accordingly, the terminal device receives a first message from the network device. For details, please refer to the relevant content of the aforementioned S201. It can be understood that the cell corresponding to the carrier in the first carrier combination is a serving cell. S301 can also be understood as: the network device configures at least one serving cell for the terminal device, and the at least one serving cell can be used for CA communication or DC communication.

[0165] S302. The terminal device sends a third message to the network device based on the dual-SIM reason. The third message is used to request to release or deactivate the first cell or the first cell group under the first carrier combination.

[0166] Accordingly, the network device receives a third message from the terminal device. The terminal device sends the third message to the network device based on the dual-SIM reason. That is, the terminal device's sending of the third message is triggered by the dual-SIM reason. Due to the dual-SIM reason, resource conflicts may occur in at least one cell / cell group. To avoid resource conflicts, the terminal device may indicate to the network device the cell or cell group for which release or deactivation is requested. For ease of description, this embodiment of the present application uses the example of a terminal device requesting the network device to release a first cell or first cell group.

[0167] Requesting to release the first cell can be understood as: resource conflict on the first cell, or temporary limitation / impact on the capabilities of the first cell. Similarly, requesting to release the first cell group can be understood as: resource conflict on the first cell group, or temporary limitation / impact on the capabilities of the first cell group.

[0168] In one implementation, when the third message is used to request the release of the first cell, it also implicitly indicates that the frequency band or frequency corresponding to the first cell is affected / restricted. The affected frequency band corresponding to the first cell can be understood as: the terminal device does not support the configuration of the frequency band corresponding to the first cell as a secondary cell or secondary cell group, or does not support the configuration of a carrier within the frequency band corresponding to the first cell as a secondary cell or secondary cell group. Alternatively, the affected frequency corresponding to the first cell can be understood as: the SSB frequency corresponding to the first cell is affected or primed, or the configuration of a cell with the SSB frequency corresponding to the first cell as a secondary cell or secondary cell group is not supported. For the network device, it can be considered that the terminal device requests the release of the first cell, and after releasing the first cell, no other cells in the same frequency band or SSB frequency as the first cell are added as SCells or SCGs. When the third message is used to request the release of the first cell group, it also implicitly indicates that the frequency band corresponding to the primary cell in the first cell group is affected / restricted. For the network device, it can be considered that the terminal device requests the release of the first cell group and no other cells in the same frequency band or SSB frequency as the primary cell in the first cell group are added as serving cells.

[0169] In another implementation, the third message may explicitly indicate the first cell and the affected frequency band, so as to indicate that the terminal device does not support configuration of one or some cells on the requested frequency band as SCell. For example, the third message includes the identification information or index of the first cell and the index of the frequency band corresponding to the first cell, which may indicate that the terminal device does not support configuration of the first cell as SCell. Similarly, the third message may also explicitly indicate the first cell group and the affected frequency band. For example, the third message includes the identification information or index of the first cell group and the index of the frequency band corresponding to the first cell group, which may indicate that the terminal device does not support configuration of the main cell in the first cell group as a service cell. In this implementation, the network device can clarify whether the terminal device does not support configuration of any cell on the requested frequency band as SCell, or does not support configuration of the first cell on the requested frequency band as SCell, so as to reduce excessive suppression and improve system performance.

[0170] S303. The network device releases or deactivates the first cell or the first cell group.

[0171] In response to the third message, the network device may release or deactivate the first cell or the first cell group. For example, the network device sends an RRC reconfiguration message to the terminal device, where the RRC reconfiguration message may indicate the release or deactivation of the first cell or the first cell group. For example, the network device sends a MAC CE to the terminal device, where the MAC CE may indicate the release or deactivation of the first cell or the first cell group.

[0172] The third message is sent by the terminal device to the network device due to dual SIM issues, implicitly indicating that the terminal device does not support adding the first cell as an SCell or the first cell group as an SCG under the current configuration. After releasing the first cell or the first cell group, the network device will not add the first cell as an SCell or the first cell group as an SCG again, as long as the carrier combination remains unchanged after the release of the first cell or the first cell group, until it receives an indication that the terminal device's transmit capability has been lifted. The carrier combination remains unchanged after the release of the first cell or the first cell group, which can be understood as: the frequency or frequency band corresponding to at least one carrier in the carrier combination remains unchanged, or the frequency or frequency band corresponding to the primary cell in the carrier combination remains unchanged. Similarly, if the third message indicates an affected frequency or frequency band, the network device will not add cells on that frequency or frequency band as SCells or SCGs again, as long as the affected frequency or frequency band remains affected under the current configuration. This prevents resource conflicts that would otherwise cause the terminal device to frequently indicate temporary capability limitations to the network device, avoids ping-pong conflicts, saves signaling overhead, and improves system performance.

[0173] It can be understood that the third message is for the currently configured carrier combination. If the carrier combination currently configured by the terminal device is changed from the first carrier combination to the second carrier combination, the third message becomes invalid. The failure of the third message indicates that the terminal device has restored the ability to configure the first cell as an SCell, or restored the ability to configure the first cell group as an SCG, or the capability restriction of the terminal device has been lifted. When the third message fails, the network device can configure the first cell as an SCell or the first cell group as an SCG under the first carrier combination. The currently configured carrier combination is changed from the first carrier combination to the second carrier combination, including: the second carrier combination and the first carrier combination correspond to different frequency band combinations; or, the frequency band corresponding to at least one carrier in the second carrier combination is different from the frequency band corresponding to at least one carrier in the first carrier combination; or, the frequency corresponding to at least one carrier in the second carrier combination is different from the frequency corresponding to at least one carrier in the first carrier combination; or, the frequency of the carrier corresponding to the main cell in the second carrier combination and the first carrier combination changes.

[0174] In one implementation, it may be assumed that the currently configured carrier combination has changed and the third message is invalid. The change in the currently configured carrier combination includes a change in the frequency band where the PCell is located and a change in the frequency band where the SCell is located.

[0175] In another implementation, if the currently configured carrier combination changes, the terminal device may indicate to the network device that the third message is invalid. For example, the terminal device sends indication information to the network device, where the indication information is used to indicate that the third message is invalid.

[0176] Accordingly, the network device receives indication information from the terminal device, and the indication information may indicate that the first information is invalid. This application does not limit how the indication information indicates that the first information is invalid. For example, the indication information may indicate that the third message is invalid through any of the following implementation methods.

[0177] In implementation mode 1, the indication information is 1 bit, and the value of the 1 bit is a first value, and the indication information indicates that the third message is invalid. The first value can be 0 or 1.

[0178] In the second implementation mode, the indication information is used to indicate all cells or cell groups that are requested to be released or deactivated. When the indication information does not include information of the first cell or the first cell group, the third indication message is invalid.

[0179] For example, the cells requested to be released under the first carrier combination include: cell A, cell B, and cell C. When the indication information includes information about cell A, cell B, and cell C, it indicates a request to release or deactivate cells A, cell B, and cell C. When the indication information includes information about cell A and cell B, and the first cell is cell C, the indication information indicates that the cells requested to be released under the first carrier combination do not include the first cell, that is, the third message is invalid.

[0180] Implementation method three: the indication information is a UAI message, and the UAI message includes a first field, and the first field is used to indicate that the third message is invalid.

[0181] For example, the first field is a field in the UAI message, which is used to carry information about the first cell group of the cell that the terminal device requests to release due to dual SIM card reasons under the current configuration. When the first field does not carry information about the first cell or the first cell group, the UAI message indicates that the third message is invalid.

[0182] Implementation method four: the indication information is a UAI message, the UAI message does not include the first field, and the UAI message is used to indicate that the third message is invalid.

[0183] For example, the first field is a field in the UAI message, which is used to carry information about the first cell group of cells that the terminal device requests to release due to dual SIM card reasons under the current configuration. When the UAI message does not include the first field, the UAI message indicates that the third message is invalid.

[0184] In communication method 300, due to dual SIM card issues, the terminal device requests the network device to release or deactivate the first cell or first cell group under the currently configured carrier combination. Accordingly, the network device releases or deactivates the first cell or first cell group under the currently configured carrier combination based on the terminal device's request, and does not configure the first cell or first cell group as an SCell or SCG unless the current configuration changes. Communication method 300 avoids frequent notifications from the terminal device to the network device regarding temporarily limited capabilities, saving signaling overhead and improving system performance.

[0185] The terminal device requests to release or deactivate the first cell or the first cell group due to dual card reasons, which can be considered as a resource conflict on the first cell or the first cell group. Therefore, even if the network device does not release or deactivate the first cell or the first cell group, the terminal device will not communicate with the network device on the first cell or the first cell group. For example, when the terminal device does not receive a response message from the network device to the third message within the first time period after sending the third message, the terminal device stops communicating with the network device in the first cell or the first cell group to avoid affecting the normal communication of the terminal device due to resource conflicts. The response message indicates the release or deactivation of the first cell or the first cell group. The terminal device stops communicating with the network device in the first cell or the first cell group, which can be replaced by the terminal device actively releasing or deactivating the first cell or the first cell group.

[0186] In one possible implementation, the terminal device starts a first timer after sending the third message, and the duration of the first timer is the first duration. After receiving a response message from the network device, the terminal device stops the first timer; after the first timer times out, the terminal device stops communicating with the network device in the first cell or the first cell group. Alternatively, if the third message indicates that the terminal device requests to release the first cell or the first cell group, the terminal device releases the first cell or the first cell group after the first timer times out; if the third message indicates that the terminal device requests to deactivate the first cell or the first cell group, the terminal device deactivates the first cell or the first cell group after the first timer times out.

[0187] Stopping communication on the first cell group means stopping communication on all cells in the first cell group. Stopping communication on the first cell or the first cell group includes at least one of the following meanings: not detecting the physical downlink control channel (PDCCH) on the first cell or the first cell group; not detecting the PDCCH used for scheduling the first cell or the first cell group; not sending a sounding reference signal (SRS) in the first cell or the first cell group; not sending a physical uplink control channel (PUCCH) in the first cell or the first cell group; not performing random access on the first cell or the first cell group; not sending channel state information (CSI) for the first cell or the first cell group; not transmitting an uplink shared channel (UL-SCH) on the first cell or the first cell group; not performing radio resource management (RRM) measurements on the first cell or the first cell group, etc. If radio link monitoring (RLM) and / or beam failure detection (BFD) are configured on the first cell group, the terminal device does not perform RLM and / or BFD on the first cell group.

[0188] For multi-card terminal devices, the terminal device can indicate to the network device that the terminal device is a terminal device with temporarily restricted capabilities or that the capabilities of the terminal device are temporarily restricted during the RRC setup process or the RRC resume process. In one implementation method, it is allowed to carry indication information in SIB1 to indicate whether the terminal device is allowed to indicate that the capabilities are temporarily restricted during the RRC setup or RRC resume process. If the indication information indicates that the terminal device is allowed to indicate that the capabilities are temporarily restricted during the RRC setup process, during the RRC setup process, the terminal device can indicate that the capabilities of the terminal device are temporarily restricted through an RRC setup completion message to avoid the configuration carried by the first RRC reconfiguration message exceeding the current capabilities of the terminal device. For another example, if the indication information indicates that the terminal device is allowed to indicate that the capabilities are temporarily restricted during the RRC resume process, the terminal device can indicate that the capabilities of the terminal device are temporarily restricted through an RRC resume request message to avoid the configuration carried by the first RRC resume message exceeding the current capabilities of the terminal device. Temporary capability restriction can be understood as the actual capability of the terminal device on one card being lower than the capability of the card saved by the network device due to multiple cards. The card change capability maintained by the network device refers to the capability reported by the terminal device to the network device through the UEcapabilityinformation message.

[0189] SIB1 may include a 1-bit early indication, the presence of which indicates that the terminal device is allowed to indicate that the capability is temporarily restricted during the RRC establishment process or the RRC recovery process; or the value of this 1 bit is 0 or 1, indicating that the terminal device is allowed to indicate that the capability is temporarily restricted during the RRC establishment process or the RRC recovery process. However, the network device does not know which specific capabilities are restricted. In one implementation, the network device sends an RRC reconfiguration message to the terminal device, and the RRC reconfiguration message includes indication information, and the indication information indicates the parameters that allow the terminal device to indicate restricted capabilities through a UAI message. In this case, when the capability of the terminal device changes, after entering the RRC connection state or receiving the RRC reconfiguration message, the terminal device may report the capability parameters of the terminal device through a UAI message to indicate which capabilities are restricted. Since the capability parameters reported by the terminal device are before entering the RRC state, the network device has a long configuration delay for the terminal device, and the data transmission efficiency is low.

[0190] To this end, the embodiments of the present application provide multiple methods. In any method, the network device may indicate parameters allowing the terminal device to indicate limited capabilities in advance and indicate parameters allowing the terminal device to indicate limited capabilities through UAI messages, so that the terminal device can indicate limited capabilities in advance according to the instructions of the network device, and can indicate parameters of limited capabilities through UAI messages before the RRC reconfiguration message, so that the network device can determine the specific limited capabilities of the terminal device as early as possible, configure reasonable parameters for the terminal device, and improve data transmission efficiency.

[0191] Please refer to Figure 4, which shows a schematic flow chart of a communication method 400 provided in an embodiment of the present application. For example, Figure 4 uses the example of communication method 400 being executed by a network device and a terminal device as an example to introduce the method from the perspective of interaction between the network device and the terminal device. It should be understood that communication method 400 can also be implemented by other devices, such as a chip or communication device with communication capabilities. As shown in Figure 4, the process of communication method 400 includes the following steps.

[0192] S401. The network device sends SIB1 to the terminal device, where the SIB1 includes first indication information, where the first indication information is used to indicate that the terminal device is allowed to indicate capability limitation before entering the RRC connected state, and to indicate that the terminal device is allowed to send UAI for temporary capability limitation.

[0193] Accordingly, the terminal device receives SIB1 from the network device. The SIB1 may include first indication information, which may be used to indicate that the terminal device is allowed to indicate that the capability is limited before entering the RRC connection state, and to indicate that the terminal device is allowed to send UAI for temporary capability limitation. For example, the first indication information is 1-bit information, and the value of the 1 bit is 1, indicating that the terminal device is allowed to indicate that the capability is limited before entering the RRC connection state, and to indicate that the terminal device is allowed to send a UAI message for temporary capability limitation; accordingly, when the value of the 1 bit is 0, it indicates that the terminal device is not allowed to send a UAI message for temporary capability limitation. For another example, SIB1 includes the first indication information, indicating that the terminal device is allowed to indicate that the capability is limited before entering the RRC connection state, and to indicate that the terminal device is allowed to send a UAI for temporary capability limitation; accordingly, SIB1 does not include the first indication information indicating that the terminal device is not allowed to send a UAI message for temporary capability limitation.

[0194] The UAI message for temporary capability restriction can also be understood as a UAI message for multiple cards (also called a multi-card UAI message). The multi-card UAI message can be used to indicate the terminal device's preference for restricted capabilities due to multiple cards. The terminal device sending a UAI message for temporary capability restriction can be replaced by the terminal device sending a multi-card UAI message. Allowing the terminal device to send a multi-card UAI message can be understood as allowing the terminal device to send a multi-card UAI message indicating that active capabilities are restricted, or allowing the terminal device to send a multi-card UAI message indicating that passive capabilities are restricted. It can be understood that when the restricted capability is independent of the current configuration, the active capability is restricted; when the restricted capability is lower than the current configuration or is based on the current configuration, the passive capability is restricted.

[0195] For example, assuming that the capability corresponding to the current configuration is the first capability set, or the capability of the terminal device before entering the RRC state is the first capability set, for example, the first capability set includes at least one of the following: the terminal device does not support CA / DC, and the terminal device does not support MIMO transmission. Allowing the terminal device to send a multi-card UAI message may be allowing the terminal device to send a first UAI message, and the restricted capability indicated by the first UAI message is greater than or equal to the first capability set through the restricted capability indicated by the UAI message; or, the restricted capability indicated by the first UAI message is independent of the currently configured carrier combination. Alternatively, allowing the terminal device to send a multi-card UAI message may be allowing the terminal device to send a second UAI message, and the restricted capability indicated by the second UAI message is less than or equal to the first capability set, or, the restricted capability indicated by the second UAI message is based on or lower than the current configuration.

[0196] S402: The terminal device sends capability limitation indication information to the network device.

[0197] Based on the first indication information, the terminal device can determine that it is allowed to indicate limited capabilities to the network device before entering the RRC connection state. Therefore, when the terminal device is limited in capability, it can send limited capability indication information to the network device before entering the RRC connection state. The limited capability indication information is used to indicate that the terminal device is limited in capability. Accordingly, the network device receives the limited capability indication information from the terminal device. For example, the capability indication information is 1-bit information. When the value of 1 bit is 0 or 1, it indicates that the terminal device is limited in capability. The limited capability indication information can be carried in an RRC connection establishment complete message, an RRC recovery complete message, or an RRC re-establishment complete message.

[0198] Alternatively, the terminal device may send a third indication message to the network device before entering the RRC connected state to indicate that the terminal device has limited capabilities. The third indication message may be carried on a first logical channel, which may be a logical channel included in a MAC subheader in a MAC PDU.

[0199] S403: The terminal device sends a UAI message to the network device. The UAI message includes parameters of the limited capabilities of the terminal device.

[0200] When the capabilities of a terminal device are limited, a UAI message carrying parameters indicating the limited capabilities of the terminal device may be sent to the network device. This UAI message may be sent to the network device before the terminal device enters the RRC connected state. For example, as shown in FIG4 , the terminal device sends the UAI message before receiving an RRC reconfiguration message from the network device.

[0201] In the communication method 400, 1 bit in SIB1 can simultaneously indicate that the terminal device is allowed to indicate capability limitation before entering the RRC connection state, and that the terminal device is allowed to send UAI for temporary capability limitation. In this way, before receiving the RRC reconfiguration message, the terminal device can indicate the parameters of the limited capability to the network device through the UAI message. In this way, when the limited capability actually supported by the terminal device is greater than the capability corresponding to the current configuration (i.e., the first capability set), the network device can configure a capability that is stronger than the first set capability for the terminal device in advance (for example, the network device configures a higher number of MIMO layers or more CCs for the terminal device), which improves the flexibility of the network device configuration on the one hand, and improves the data transmission rate on the other hand.

[0202] Please refer to Figure 5, which shows a schematic flow chart of a communication method 500 provided in an embodiment of the present application. For example, Figure 5 uses the example of communication method 500 being executed by a network device and a terminal device as an example to introduce the method from the perspective of interaction between the network device and the terminal device. It should be understood that communication method 500 can also be implemented by other devices, such as a chip or communication device with communication capabilities. As shown in Figure 5, the process of communication method 500 includes the following steps.

[0203] S501. The network device sends first indication information to the terminal device, where the first indication information is used to indicate whether the terminal device is allowed to indicate limited capability before entering the RRC connected state.

[0204] Accordingly, the terminal device receives first indication information from the network device. The first indication information may be carried in SIB1. For example, the first indication information is 1 bit in SIB1. When the value of the 1 bit is 1, it indicates that the terminal device is allowed to indicate limited capabilities before entering the RRC connected state; when the value of the 1 bit is 0, it indicates that the terminal device is not allowed to indicate limited capabilities before entering the RRC connected state.

[0205] S502. The network device sends second indication information to the terminal device, where the second indication information is used to indicate whether the terminal device is allowed to send a UAI message for temporary capability restriction.

[0206] Accordingly, the terminal device receives the second indication information from the network device. The second indication information can be carried in the RRC reconfiguration message or the RRC recovery message. Regarding the meaning of "allowing the terminal device to send a UAI message for temporary capability restriction", please refer to the relevant content in the aforementioned S401. For example, the second indication information is used to indicate whether the terminal device is allowed to send a UAI message for temporary capability restriction. It can be replaced by the second indication information being used to indicate whether sending a multi-card UAI message is allowed; or the second indication information is used to indicate whether sending a first UAI message is allowed; or the second indication information is used to indicate whether sending a second UAI message is allowed. For the sake of brevity, it will not be repeated here.

[0207] In one implementation, the second indication information may be 1 bit, and the value of the 1 bit is 1, indicating that the terminal device is allowed to send a UAI message for temporary capability restriction; when the value of the 1 bit is 0, it indicates that the terminal device is not allowed to send a UAI message for temporary capability restriction. Or,

[0208] In another implementation, the second indication information is the candidate service frequency information carried in the RRC reconfiguration message or the RRC recovery message, and the second indication information is used to indicate that the terminal device is allowed to send a UAI message for temporary capability restriction. Alternatively, the network device sends an RRC reconfiguration message / RRC recovery message to the terminal device, and when the RRC reconfiguration message / RRC recovery message includes the candidate service frequency information, the RRC reconfiguration message / RRC recovery message indicates that the terminal device is allowed to send a UAI message for temporary capability restriction. On the contrary, the network device sends an RRC reconfiguration message / RRC recovery message to the terminal device, and when the RRC reconfiguration message / RRC recovery message does not include the candidate service frequency information, the RRC reconfiguration message / RRC recovery message indicates that the terminal device is not allowed to send a UAI message for temporary capability restriction. For an introduction to the candidate service frequency, please refer to the relevant content in the aforementioned communication method 200, which will not be repeated here.

[0209] S503: The terminal device sends a UAI message to the network device. The UAI message includes parameters of the limited capabilities of the terminal device.

[0210] When the capabilities of a terminal device are limited, a UAI message containing parameters indicating the limited capabilities of the terminal device may be sent to the network device. This UAI message may be sent to the network device after the terminal device enters the RRC connected state. For example, the terminal device may send the UAI message after sending an RRC reconfiguration complete message.

[0211] In the communication method 500, a 1-bit indication in SIB1 allows the terminal device to indicate capability limitation before entering the RRC connected state, and a second indication information allows the terminal device to send UAI for temporary capability limitation. In this way, when the limited capabilities actually supported by the terminal device are greater than the capabilities corresponding to the current configuration (i.e., the first capability set), the network device can configure and schedule the terminal device according to a capability that is stronger than the first set capability (for example, the network device configures a higher number of MIMO layers or a greater number of CCs for the terminal device), which improves the flexibility of network device configuration on the one hand and improves the data transmission rate on the other.

[0212] The various embodiments provided in the present application can be implemented independently or in combination with each other. For example, communication method 200 can be combined with communication method 400, or with communication method 500. Communication method 300 can be combined with communication method 400, or with communication method 500.

[0213] In the embodiments provided in the present application, the methods provided in the embodiments of the present application are introduced from the perspective of the interaction between the terminal device and the network device. Among them, the steps performed by the terminal device can be implemented by different functional entities that constitute the terminal device. The steps performed by the network device can be implemented by different functional entities that constitute the network device. For example, the network device can be a CU-DU architecture, the CU can generate a first message, and the DU can send an RRC first message. In order to implement the various functions in the method provided in the above-mentioned embodiments of the present application, the terminal device and the network device may include a hardware structure and / or a software module, and implement the above-mentioned functions in the form of a hardware structure, a software module, or a hardware structure plus a software module. Whether one of the above-mentioned functions is executed in the form of a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraints of the technical solution.

[0214] The following describes the communication device used to implement the above method in the embodiment of the present application with reference to the accompanying drawings. Therefore, the above contents can be used in subsequent embodiments, and repeated contents will not be repeated.

[0215] Figure 6 is a schematic block diagram of a communication device 600 provided in an embodiment of the present application. The communication device 600 may be a network device or a terminal device in the aforementioned embodiments. For example, the communication device 600 may be the network device or terminal device in Figure 1; alternatively, the communication device 600 may be a chip (system) in a network device or a chip (system) in a terminal device; or alternatively, the communication device 600 may be a software module of the network device or terminal device. The communication device 600 may implement the functions or steps implemented by the terminal device or network device in the aforementioned method embodiments. The communication device 600 may include a processing module 610 and a transceiver module 620. Optionally, it may also include a storage module, which may be used to store instructions (code or program) and / or data. The storage module may be, for example, a memory. The processing module 610 and the transceiver module 620 may be coupled to the storage module. For example, the processing module 610 may read the instructions (code or program) and / or data in the storage module to implement the corresponding method. When the communication device 600 is a chip in a terminal device, the storage module may be a storage module within the chip, such as a register or cache. For example, the storage module may also be a storage module located outside the chip within the network device / terminal device, such as a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM), etc. The above-mentioned units may be independently provided or partially or fully integrated.

[0216] In one possible implementation, the processing module 610 may be a processor or controller, such as a general-purpose central processing unit (CPU), a general-purpose processor, a digital signal processing (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It may implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. The processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like. The transceiver module 620 is a transceiver, an interface circuit, a bus, a pin, or other possible communication interface for receiving signals from other devices. For example, when the device is implemented in the form of a chip, the transceiver module 620 is an interface circuit for the chip to receive signals from other chips or devices, or an interface circuit for the chip to send signals to other chips or devices.

[0217] In some possible implementations, the communication device 600 can implement the behaviors and functions of the terminal device in the above-described method embodiments. The communication device 600 can be a terminal device, a component (e.g., a chip or circuit) used in a terminal device, a chip or chipset in a terminal device, or a portion of a chip used to perform the functions of the relevant method, or a software module capable of implementing the method performed by the terminal device in the above-described method (e.g., any of the methods in communication methods 200-500), without limitation.

[0218] For example, the communication device 600 implements the method executed by the terminal device in the embodiment of Figure 2. The transceiver module 620 can be used to execute S201-S205 in the embodiment shown in Figure 2, and / or to support other processes of the technology described herein; the processing module 610 can be used to execute other processes of the technology described herein.

[0219] In a possible implementation, the transceiver module 620 is configured to receive a first message from a network device and send first information to the network device. The first message is configured to configure a first carrier combination. The first information indicates a first frequency band that is not supported by the first carrier combination due to dual SIM card issues.

[0220] As an optional implementation method, the transceiver module 620 is also used to: send second information to the network device, where the second information is used to indicate the second frequency band and the restricted capability parameters corresponding to the second frequency band, where the second frequency band is a frequency band restricted under the first carrier combination due to dual card reasons.

[0221] As an optional implementation manner, the carrier combination currently configured in the communication apparatus 600 is changed from the first carrier combination to the second carrier combination, and the first information becomes invalid.

[0222] As an optional implementation manner, the transceiver module 620 is further used to: send indication information to the network device, where the indication information is used to indicate that the first information is invalid.

[0223] As an optional implementation method, the indication information is used to indicate that the first information is invalid, including: the indication information is 1 bit, the value of the 1 bit is the first value, and the indication information indicates that the first information is invalid; or the indication information does not include information of the first frequency band, indicating that the first information is invalid; wherein the indication information is used to indicate an unsupported frequency band under the first carrier combination; or the indication information is a UAI message, the UAI message includes a first field, and the first field is used to indicate that the first information is invalid; or the indication information is a UAI message, and when the UAI message does not include the first field, the UAI message is used to indicate that the first information is invalid.

[0224] As an optional implementation method, before sending the first information to the network device, the transceiver module 620 is also used to: receive a second message from the network device, the second message including information about the candidate service frequency, and the candidate service frequency is the frequency of the candidate SCell or candidate SCG under the first carrier combination.

[0225] For another example, the communication device 600 implements the method executed by the network device in the embodiment of Figure 2. The transceiver module 620 can be used to execute S201-S205 in the embodiment shown in Figure 2, and / or to support other processes of the technology described herein; the processing module 610 can be used to execute other processes of the technology described herein.

[0226] In a possible implementation, the transceiver module 620 is configured to send a first message and receive a first message from a terminal device. The first message is configured to configure a first carrier combination. The first message is configured to indicate a first frequency band that is not supported by the first carrier combination due to dual SIM card issues.

[0227] As an optional implementation method, the transceiver module 620 is also used to: receive second information from the terminal device, where the second information is used to indicate the second frequency band and the restricted capability parameters corresponding to the second frequency band, where the second frequency band is a frequency band restricted under the first carrier combination due to dual card reasons.

[0228] As an optional implementation manner, the carrier combination currently configured in the communication apparatus 600 is changed from the first carrier combination to the second carrier combination, and the first information becomes invalid.

[0229] As an optional implementation manner, the transceiver module 620 is further used to: receive indication information from the terminal device, where the indication information is used to indicate that the first information is invalid.

[0230] As an optional implementation method, the indication information is used to indicate that the first information is invalid, including: the indication information is 1 bit, the value of the 1 bit is the first value, and the indication information indicates that the first information is invalid; or the indication information does not include information of the first frequency band, indicating that the first information is invalid; wherein the indication information is used to indicate an unsupported frequency band under the first carrier combination; or the indication information is a UAI message, the UAI message includes a first field, and the first field is used to indicate that the first information is invalid; or the indication information is a UAI message, and when the UAI message does not include the first field, the UAI message is used to indicate that the first information is invalid.

[0231] As an optional implementation method, the transceiver module 620 is also used to: send a second message to the terminal device, where the second message includes information about the candidate service frequency, where the candidate service frequency is the frequency of the candidate SCell or candidate SCG under the first carrier combination.

[0232] When the communication device 600 implements the method executed by the terminal device or network device in the embodiment of Figure 2, the first frequency band is a frequency band that is not supported under the first carrier combination due to dual-card reasons, including: the first frequency band is at least one frequency band that is not supported to be configured as SCell or SCG under the first carrier combination.

[0233] As an optional implementation method, the first frequency band is at least one frequency band that is not supported to be configured as an SCell or SCG under the first carrier combination, including: the first frequency band is at least one frequency band of the affected SCell or SCG under the first carrier combination, and the affected SCell or SCG is the cell corresponding to the carrier in the first carrier combination; or, the first frequency band is at least one frequency band of the SCell or SCG requested to be released under the first carrier combination, and the SCell or SCG requested to be released is the cell corresponding to the carrier in the first carrier combination.

[0234] As an optional implementation manner, the first frequency band includes one or more frequencies among the candidate service frequencies and / or frequencies corresponding to the first carrier combination.

[0235] As an optional implementation manner, the first frequency band is the first frequency, the first information is ARFCN, and the ARFCN is used to indicate the first frequency; or, the first information is an index or identifier of at least one frequency band.

[0236] For example, the communication device 600 implements the method executed by the terminal device in the embodiment of FIG. 3 . The transceiver module 620 can be used to execute S301-S302 in the embodiment shown in FIG. 3 , and / or other processes used to support the technology described herein; the processing module 610 can be used to execute other processes used in the technology described herein. For another example, the communication device 600 implements the method executed by the network device in the embodiment of FIG. 3 . The transceiver module 620 can be used to execute S301-S302 in the embodiment shown in FIG. 3 , and / or other processes used to support the technology described herein; the processing module 610 can be used to execute other processes used in the technology described herein.

[0237] In a possible implementation, the communication device 600 implements the method executed by the terminal device in the embodiment of FIG. 3 , wherein the transceiver module 620 is configured to receive a first message from a network device and send a second message to the network device based on the dual SIM reason. The first message is configured to configure a first carrier combination, and the second message is configured to request the release of the first cell or the first cell group under the first carrier combination.

[0238] In a possible implementation, a communication device 600 implements the method executed by the network device in the embodiment of FIG. 3 , wherein the transceiver module 620 is configured to send a first message and receive a second message sent by the terminal device based on a dual-SIM reason. The first message is configured to configure a first carrier combination, and the second message is configured to request the release of the first cell or the first cell group under the first carrier combination.

[0239] As an optional implementation method, when the second message is used to request the release of the first cell, the second message also indicates that the frequency band corresponding to the first cell is affected; or, when the second message is used to request the release of the first cell group, the second message also indicates that the frequency band corresponding to the main cell in the first cell group is affected.

[0240] As an optional implementation method, the second message includes identification information of the first cell and an index of the frequency band corresponding to the first cell; or, the second message includes identification information of the first cell group and an index of the frequency band corresponding to the main cell in the first cell group.

[0241] As an optional implementation method, the communication device 600 implements the method executed by the terminal device in the embodiment of Figure 3, and the processing module 610 is also used to stop communicating with the network device in the first cell or the first cell group if no response message from the network device to the message is received within a first time period after sending the second message, and the response message indicates the release or deactivation of the first cell or the first cell group.

[0242] As an optional implementation method, the carrier combination currently configured by the terminal device is changed from the first carrier combination to the second carrier combination, and the second message becomes invalid.

[0243] As an optional implementation, the communication device 600 implements the method executed by the terminal device in the embodiment of FIG. 3 , and the transceiver module 620 is further configured to send indication information to the network device, where the indication information is used to indicate that the second message is invalid. The communication device 600 implements the method executed by the network device in the embodiment of FIG. 3 , and the transceiver module 620 is further configured to receive indication information from the terminal device, where the indication information is used to indicate that the second message is invalid.

[0244] As an optional implementation method, the indication information used to indicate the second message includes: the indication information is 1 bit, the value of the 1 bit is the first value, and the indication information indicates that the second message is invalid; or, the indication information does not include information of the first cell or the first cell group, indicating that the second message is invalid; wherein, the indication information is used to indicate the cell or cell group requested to be released under the first carrier combination; or, the indication information is a UAI message, the UAI message includes a first field, and the first field is used to indicate that the second message is invalid; or, the indication information is a UAI message, and when the UAI message does not include the first field, the UAI message is used to indicate that the second message is invalid.

[0245] For example, the communication device 600 implements the method executed by the terminal device in the embodiment of FIG. 4 . The transceiver module 620 can be used to execute S401-S402 in the embodiment shown in FIG. 4 , and / or other processes used to support the technology described herein; the processing module 610 can be used to execute other processes used in the technology described herein. For another example, the communication device 600 implements the method executed by the network device in the embodiment of FIG. 4 . The transceiver module 620 can be used to execute S401-S402 in the embodiment shown in FIG. 4 , and / or other processes used to support the technology described herein; the processing module 610 can be used to execute other processes used in the technology described herein.

[0246] In a possible implementation, the communication device 600 implements the method executed by the terminal device in the embodiment of Figure 4, and the transceiver module 620 is used to receive a first indication information from the network device, the first indication information is used to indicate whether the terminal device is allowed to indicate that the capability is limited before entering the RRC connection state, and is used to indicate whether the terminal device is allowed to send UAI for temporary capability limitation, and the indication information is carried on SIB1. The communication device 600 implements the method executed by the network device in the embodiment of Figure 4, and the transceiver module 620 is used to send a first indication information, the first indication information is used to indicate whether the terminal device is allowed to indicate that the capability is limited before entering the RRC connection state, and is used to indicate whether the terminal device is allowed to send UAI for temporary capability limitation, and the indication information is carried on SIB1.

[0247] As an optional implementation, the communication device 600 implements the method executed by the terminal device in the embodiment of Figure 4, and the transceiver module 620 is further used to: send capability limitation indication information before entering the RRC connection state, the capability limitation indication information is carried in a first message, the first message is an RRC connection establishment completion message, or an RRC recovery completion message, or an RRC re-establishment completion message; or, send third indication information before entering the RRC connection state, the third indication information is carried in a first logical channel. The communication device 600 implements the method executed by the network device in the embodiment of Figure 4, and the transceiver module 620 is further used to: receive capability limitation indication information from the terminal device, the capability limitation indication information is carried in a first message, the first message is an RRC connection establishment completion message, or an RRC recovery completion message, or an RRC re-establishment completion message; or, receive third indication information from the terminal device, the third indication information is carried in the first logical channel.

[0248] As an optional implementation manner, the capability limitation includes at least one of the following: the terminal device does not support CA / DC, and the terminal device does not support MIMO transmission.

[0249] As an optional implementation method, whether the terminal device is allowed to send UAI for temporary capability restriction includes: whether the terminal device is allowed to send a first UAI, and the restricted capability indicated by the first UAI is independent of the currently configured carrier combination; or whether the terminal device is allowed to send a second UAI in the RRC establishment or recovery process, and the restricted capability indicated by the second UAI is based on the current RRC configuration, or the capability indicated by the second UAI is lower than the current RRC configuration.

[0250] For example, the communication device 600 implements the method executed by the terminal device in the embodiment of FIG. 5 . The transceiver module 620 can be used to execute S501-S502 in the embodiment shown in FIG. 5 , and / or other processes used to support the technology described herein; the processing module 610 can be used to execute other processes used in the technology described herein. For another example, the communication device 600 implements the method executed by the network device in the embodiment of FIG. 5 . The transceiver module 620 can be used to execute S501-S502 in the embodiment shown in FIG. 5 , and / or other processes used to support the technology described herein; the processing module 610 can be used to execute other processes used in the technology described herein.

[0251] In a possible implementation, the communication device 600 implements the method executed by the terminal device in the embodiment of Figure 5, and the transceiver module 620 is used to receive the first indication information and the second indication information from the network device. Among them, the first indication information is used to indicate whether it is allowed. The terminal device indicates that the capability is limited before entering the RRC connection state. The second indication information is used to indicate whether the terminal device is allowed to send a UAI message for temporary capability restriction, and the indication information is carried on SIB1. The communication device 600 implements the method executed by the network device in the embodiment of Figure 5, and the transceiver module 620 is used to send the first indication information and the second indication information. Among them, the first indication information is used to indicate whether it is allowed. The terminal device indicates that the capability is limited before entering the RRC connection state. The second indication information is used to indicate whether the terminal device is allowed to send a UAI message for temporary capability restriction, and the indication information is carried on SIB1.

[0252] As an optional implementation, the communication device 600 implements the method executed by the terminal device in the embodiment of Figure 4, and the transceiver module 620 is further used to: send capability limitation indication information before entering the RRC connection state, the capability limitation indication information is carried in a first message, the first message is an RRC connection establishment completion message, or an RRC recovery completion message, or an RRC re-establishment completion message; or, send third indication information before entering the RRC connection state, the third indication information is carried in a first logical channel. The communication device 600 implements the method executed by the network device in the embodiment of Figure 4, and the transceiver module 620 is further used to: receive capability limitation indication information from the terminal device, the capability limitation indication information is carried in a first message, the first message is an RRC connection establishment completion message, or an RRC recovery completion message, or an RRC re-establishment completion message; or, receive third indication information from the terminal device, the third indication information is carried in the first logical channel.

[0253] As an optional implementation method, the second indication information is the candidate service frequency information carried in the RRC reconfiguration message or the RRC recovery message, and the second indication information is used to indicate that the terminal device is allowed to send a UAI message for temporary capability restriction.

[0254] When the communication device 600 is a chip-type device or circuit, the transceiver module may be an input / output circuit and / or a communication interface; the processing module may be an integrated processor or microprocessor or integrated circuit.

[0255] Figure 7 is a schematic block diagram of a communication device 700 provided in an embodiment of the present application. The communication device 700 can be a network device or a terminal device in the above-mentioned embodiment. For example, the communication device 700 can be the network device or terminal device in Figure 1; or the communication device 700 is a chip (system) in the network device or terminal device. In the embodiment of the present application, the chip system can be composed of a chip, or it can include a chip and other discrete devices. For specific functions, please refer to the description in the above-mentioned method embodiment.

[0256] The communication device 700 includes one or more processors 701, which are used to implement or support the communication device 700 to implement the functions of the terminal device or network device in the method provided in the embodiment of the present application. Please refer to the detailed description in the method example for details, which will not be repeated here. The processor 701 can also be called a processing unit or processing module, which can implement certain control functions. The processor 701 can be a general-purpose processor or a dedicated processor. For example, it includes: a baseband processor, a central processing unit, an application processor, a modem processor, a graphics processor, an image signal processor, a digital signal processor, a video codec processor, a controller, a memory, and / or a neural network processor. The baseband processor can be used to process communication protocols and communication data. The central processing unit can be used to control the communication device 700 (such as a network device or terminal device), execute software programs and / or process data. Different processors can be independent devices or integrated into one or more processors, for example, integrated into one or more dedicated integrated circuits.

[0257] In one design, the processor 701 may include a program 703 (sometimes also referred to as code or instructions), which may be executed on the processor 701 to cause the communication device 700 to perform the methods described in the following embodiments. In another possible design, the communication device 700 includes circuitry (not shown in FIG7 ) configured to implement the network device or terminal device functions described in the above embodiments.

[0258] In one design, the communication device 700 may include one or more memories 702 on which a program 704 (sometimes also referred to as code or instructions) is stored. The program 704 can be run on the processor 701, so that the communication device 700 performs the method described in the above method embodiment, such as the process shown in one or more figures in Figures 2 to 5.

[0259] In one design, the processor 701 and / or the memory 702 may include an artificial intelligence (AI) module 707 and an AI module 708, each configured to implement AI-related functions. The AI ​​module may be implemented using software, hardware, or a combination of software and hardware. For example, the AI ​​module may include a RAN intelligent controller (RIC) module. For example, the AI ​​module may be a near real-time RIC or a non-real-time RIC.

[0260] In a possible design, data may also be stored in the processor 701 and / or the memory 702. The processor and the memory may be provided separately or integrated together.

[0261] In one possible design, the communication device 700 may further include a transceiver 705 and / or an antenna 706. The processor 701 may also be sometimes referred to as a processing unit, and controls the communication device 700. The transceiver 705 may also be sometimes referred to as a transceiver unit, a transceiver, a transceiver circuit, or a transceiver, and is configured to implement the transceiver function of the communication device through the antenna 706.

[0262] In one possible design, the communication device 700 may further include one or more of the following components: a wireless communication module, an audio module, an external memory interface, an internal memory, a universal serial bus (USB) interface, a power management module, an antenna, a speaker, a microphone, an input / output module, a sensor module, a motor, a camera, or a display screen, etc. It will be appreciated that in some embodiments, the communication device 700 may include more or fewer components, or some components may be integrated or separated. These components may be implemented in hardware, software, or a combination of software and hardware.

[0263] The communication device in the above embodiments can be a terminal device (or network device), a circuit, a chip used in a terminal device (or network device), or other combined devices or components with the above terminal device (or network device). When the communication device is a terminal device (or network device), the transceiver module can be a transceiver, which can include an antenna and a radio frequency circuit, etc., and the processing module can be a processor, such as a CPU. When the communication device is a component with the functions of the above terminal device (or network device), the transceiver module can be a radio frequency unit, and the processing module can be a processor. When the communication device is a chip system, the communication device can be an FPGA, a dedicated ASIC, a system on chip (SoC), a CPU, a network processor (NP), a DSP, a microcontroller unit (MCU), a programmable logic device (PLD), or other integrated circuit. The processing module can be the processor of the chip system. The transceiver module or communication interface can be the input / output interface or interface circuit of the chip system. For example, the interface circuit can be a code / data read / write interface circuit. The interface circuit can be used to receive code instructions (the code instructions are stored in a memory and can be read directly from the memory or read from the memory via another device) and transmit them to the processor; the processor can be used to execute the code instructions to perform the method in the above method embodiment. For example, the interface circuit can also be a signal transmission interface circuit between a communication processor and a transceiver.

[0264] The present application also provides a communication system. Specifically, the communication system includes a network device and a terminal device. Exemplarily, the communication system includes a terminal device and a network device for implementing the functions associated with one or more of Figures 2 to 5. For details, please refer to the relevant descriptions in the above method embodiments and will not be repeated here.

[0265] An embodiment of the present application also provides a computer-readable storage medium, including instructions, which, when executed on a computer, enables the computer to execute the method executed by the terminal device or network device in Figures 2 to 5.

[0266] An embodiment of the present application also provides a computer program product, including instructions, which, when executed on a computer, enables the computer to execute the method executed by the terminal device or network device in Figures 2 to 5.

[0267] The embodiment of the present application provides a chip system, which includes a processor and may also include a memory, for implementing the functions of the terminal device or network device in the above method. The chip system can be composed of a chip or include a chip and other discrete devices.

[0268] To implement the functions of the communication device shown in Figures 6 and 7, embodiments of the present application further provide a chip including a processor for supporting the communication device in implementing the functions of the terminal device or network device in the above method embodiments. In one possible design, the chip is connected to or includes a memory, which is used to store computer programs, instructions, and data necessary for the communication device.

[0269] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0270] Those skilled in the art will appreciate that the various illustrative logical blocks and steps described in conjunction with the embodiments disclosed herein can be implemented using electronic hardware, computer software, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0271] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0272] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0273] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0274] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the part that essentially contributes to the technical solution of the present application or the part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a RAM, a magnetic disk or an optical disk.

[0275] Obviously, those skilled in the art may make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include these modifications and variations.

Claims

1. A communication method, characterized in that: include: receiving a first message from a network device, wherein the first message is used to configure a first carrier combination; Sending first information to the network device, where the first information is used to indicate a first frequency band, where the first frequency band is a frequency band that is not supported under the first carrier combination due to dual-card reasons.

2. The method according to claim 1, characterized in that The method further comprises: Sending second information to the network device, where the second information is used to indicate a second frequency band and a capability parameter corresponding to the second frequency band, where the second frequency band is a frequency band with limited capability under the first carrier combination due to dual-card reasons.

3. The method according to claim 1, characterized in that The first frequency band is a frequency band that is not supported under the first carrier combination due to dual-card reasons, including: The first frequency band is at least one frequency band that does not support configuration as an SCell or SCG under the first carrier combination.

4. The method according to claim 3, characterized in that The first frequency band is at least one frequency band that is not supported to be configured as an SCell or an SCG under the first carrier combination, including: The first frequency band is at least one frequency band of an affected SCell or SCG under the first carrier combination, and the affected SCell or SCG is a cell corresponding to a carrier in the first carrier combination; or, The first frequency is at least one frequency band of the SCell or SCG requested to be released under the first carrier combination, and the SCell or SCG requested to be released is a cell corresponding to a carrier in the first carrier combination.

5. The method according to any one of claims 1 to 4, characterized in that The carrier combination currently configured by the terminal device is changed from the first carrier combination to the second carrier combination, and the first information becomes invalid.

6. The method according to any one of claims 1 to 4, characterized in that The method further comprises: Send indication information to the network device, where the indication information is used to indicate that the first information is invalid.

7. The method according to any one of claims 1 to 6, characterized in that Before sending the first information to the network device, the method further includes: A second message is received from the network device, where the second message includes information about a candidate service frequency, where the candidate service frequency is a frequency of a candidate SCell or a candidate SCG under the first carrier combination.

8. A communication method, characterized in that: include: Sending a first message to a terminal device, where the first message is used to configure a first carrier combination; Receive first information from the terminal device, where the first information is used to indicate a first frequency band, where the first frequency band is a frequency band that is not supported under the first carrier combination due to dual-card reasons.

9. The method according to claim 8, characterized in that The method further comprises: Receive second information from the terminal device, where the second information is used to indicate a second frequency band and a capability parameter corresponding to the second frequency band, where the second frequency band is a frequency band with limited capability under the first carrier combination due to dual-card reasons.

10. The method according to claim 8, characterized in that The first frequency band is a frequency band that is not supported under the first carrier combination due to dual-card reasons, including: The first frequency band is at least one frequency band that does not support configuration as an SCell or SCG under the first carrier combination.

11. The method according to claim 10, characterized in that The first frequency band is at least one frequency band that is not supported to be configured as an SCell or an SCG under the first carrier combination, including: The first frequency band is at least one frequency band of an affected SCell or SCG under the first carrier combination, and the affected SCell or SCG is a cell corresponding to a carrier in the first carrier combination; or, The first frequency is at least one frequency band of the SCell or SCG requested to be released under the first carrier combination, and the SCell or SCG requested to be released is a cell corresponding to a carrier in the first carrier combination.

12. The method according to any one of claims 8 to 11, characterized in that The carrier combination currently configured by the terminal device is changed from the first carrier combination to the second carrier combination, and the first information becomes invalid.

13. The method according to any one of claims 8 to 11, characterized in that The method further comprises: Receive indication information from the terminal device, where the indication information is used to indicate that the first information is invalid.

14. The method according to any one of claims 8 to 13, characterized in that The method further comprises: A second message is sent, where the second message includes information about a candidate service frequency, where the candidate service frequency is the frequency of a candidate SCell or a candidate SCG under the first carrier combination.

15. A communication method, characterized in that: include: receiving a first message from a network device, wherein the first message is used to configure a first carrier combination; A third message is sent to the network device based on the dual card reason, where the third message is used to request to release the first cell or the first cell group under the first carrier combination.

16. The method according to claim 15, characterized in that When the third message is used to request the release of the first cell, the third message also indicates that the frequency band corresponding to the first cell is affected; or, when the third message is used to request the release of the first cell group, the third message also indicates that the frequency band corresponding to the main cell in the first cell group is affected.

17. The method according to claim 15 or 16, characterized in that The third message includes identification information of the first cell and an index of a frequency band corresponding to the first cell; or, the third message includes identification information of the first cell group and an index of a frequency band corresponding to a primary cell in the first cell group.

18. The method according to any one of claims 15 to 17, characterized in that The method further comprises: If no response message from the network device to the third message is received within a first time period after sending the third message, communication with the network device in the first cell or the first cell group is stopped, and the response message indicates releasing or deactivating the first cell or the first cell group.

19. The method according to any one of claims 15 to 18, characterized in that The carrier combination currently configured by the terminal device is changed from the first carrier combination to the second carrier combination, and the third message becomes invalid.

20. The method according to any one of claims 15 to 18, characterized in that Send indication information to the network device, where the indication information is used to indicate that the third message is invalid.

21. A communication method, characterized in that: include: Sending a first message, where the first message is used to configure a first carrier combination; A third message is received from the terminal device, where the third message is sent to the network device based on a dual-card reason, and the third message is used to request to release the first cell or the first cell group under the first carrier combination.

22. The method according to claim 21, characterized in that When the third message is used to request the release of the first cell, the third message also indicates that the frequency band corresponding to the first cell is affected; or, when the third message is used to request the release of the first cell group, the third message also indicates that the frequency band corresponding to the main cell in the first cell group is affected.

23. The method according to claim 21 or 22, characterized in that The third message includes identification information of the first cell and an index of a frequency band corresponding to the first cell; or, the third message includes identification information of the first cell group and an index of a frequency band corresponding to a primary cell in the first cell group.

24. The method according to any one of claims 21 to 23, characterized in that The carrier combination currently configured by the terminal device is changed from the first carrier combination to the second carrier combination, and the third message becomes invalid.

25. The method according to any one of claims 21 to 24, characterized in that Receive indication information from the terminal device, where the indication information is used to indicate that the third message is invalid.

26. A communication device, characterized in that: include: a transceiver module, configured to receive a first message from a network device, and send first information to the network device, wherein the first message is used to configure a first carrier combination, and the first information is used to indicate a first frequency band, and the first frequency band is a frequency band that is not supported under the first carrier combination due to dual card reasons; A processing module is used to determine the first information.

27. The device according to claim 26, characterized in that The transceiver module is also used for: Sending second information to the network device, where the second information is used to indicate a second frequency band and a capability parameter corresponding to the second frequency band, where the second frequency band is a frequency band with limited capability under the first carrier combination due to dual-card reasons.

28. The device according to claim 26, characterized in that The first frequency band is a frequency band that is not supported under the first carrier combination due to dual-card reasons, including: The first frequency band is at least one frequency band that does not support configuration as an SCell or SCG under the first carrier combination.

29. The device according to claim 28, characterized in that The first frequency band is at least one frequency band that is not supported to be configured as an SCell or an SCG under the first carrier combination, including: The first frequency band is at least one frequency band of an affected SCell or SCG under the first carrier combination, and the affected SCell or SCG is a cell corresponding to a carrier in the first carrier combination; or, The first frequency is at least one frequency band of the SCell or SCG requested to be released under the first carrier combination. The released SCell or SCG is a cell corresponding to the carrier in the first carrier combination.

30. The device according to any one of claims 26 to 29, characterized in that The carrier combination currently configured by the communication device is changed from the first carrier combination to the second carrier combination, and the first information becomes invalid.

31. The device according to any one of claims 26 to 29, characterized in that The transceiver module is also used for: Send indication information to the network device, where the indication information is used to indicate that the first information is invalid.

32. The device according to any one of claims 26 to 31, characterized in that Before sending the first information to the network device, the transceiver module is further used to: A second message is received from the network device, where the second message includes information about a candidate service frequency, where the candidate service frequency is a frequency of a candidate SCell or a candidate SCG under the first carrier combination.

33. A communication device, characterized in that: include: A transceiver module, configured to send a first message to a terminal device, and receive first information from the terminal device, wherein the first message is used to configure a first carrier combination, and the first information is used to indicate a first frequency band, and the first frequency band is a frequency band that is not supported under the first carrier combination due to dual-card reasons; A processing module is used to determine the first message.

34. The device according to claim 33, characterized in that The transceiver module is also used for: Receive second information from the terminal device, where the second information is used to indicate a second frequency band and a capability parameter corresponding to the second frequency band, where the second frequency band is a frequency band with limited capability under the first carrier combination due to dual-card reasons.

35. The device according to claim 33, characterized in that The first frequency band is a frequency band that is not supported under the first carrier combination due to dual-card reasons, including: The first frequency band is at least one frequency band that does not support configuration as an SCell or SCG under the first carrier combination.

36. The device according to claim 35, characterized in that The first frequency band is at least one frequency band that is not supported to be configured as an SCell or an SCG under the first carrier combination, including: The first frequency band is at least one frequency band of an affected SCell or SCG under the first carrier combination, and the affected SCell or SCG is a cell corresponding to a carrier in the first carrier combination; or, The first frequency is at least one frequency band of the SCell or SCG requested to be released under the first carrier combination, and the SCell or SCG requested to be released is a cell corresponding to a carrier in the first carrier combination.

37. The device according to any one of claims 33 to 36, characterized in that The carrier combination currently configured by the terminal device is changed from the first carrier combination to the second carrier combination, and the first information becomes invalid.

38. The device according to any one of claims 33 to 36, characterized in that The transceiver module is also used for: Receive indication information from the terminal device, where the indication information is used to indicate that the first information is invalid.

39. The device according to any one of claims 33 to 38, characterized in that The transceiver module is also used for: A second message is sent, where the second message includes information about a candidate service frequency, where the candidate service frequency is the frequency of a candidate SCell or a candidate SCG under the first carrier combination.

40. A communication device, characterized in that: include: A transceiver module, configured to receive a first message from a network device, and send a third message to the network device based on a dual-card reason, wherein the first message is used to configure a first carrier combination, and the third message is used to request to release a first cell or a first cell group under the first carrier combination; A processing module is used to determine the third message.

41. The device according to claim 40, characterized in that When the third message is used to request the release of the first cell, the third message also indicates that the frequency band corresponding to the first cell is affected; or, when the third message is used to request the release of the first cell group, the third message also indicates that the frequency band corresponding to the main cell in the first cell group is affected.

42. The device according to claim 40 or 41, characterized in that The third message includes identification information of the first cell and an index of a frequency band corresponding to the first cell; or, the third message includes identification information of the first cell group and an index of a frequency band corresponding to a primary cell in the first cell group.

43. The device according to any one of claims 40 to 42, characterized in that The device transceiver module is also used for: If no response message from the network device to the third message is received within a first time period after sending the third message, communication with the network device in the first cell or the first cell group is stopped, and the response message indicates releasing or deactivating the first cell or the first cell group.

44. The device according to any one of claims 40 to 43, characterized in that The carrier combination currently configured by the terminal device is changed from the first carrier combination to the second carrier combination, and the third message becomes invalid.

45. The device according to any one of claims 40 to 43, characterized in that The transceiver module is also used for: Send indication information to the network device, where the indication information is used to indicate that the third message is invalid.

46. ​​A communication device, characterized in that: include: a transceiver module, configured to send a first message and receive a third message from the terminal device, wherein the first message is used to configure a first carrier combination, the third message is sent to the network device based on a dual card reason, and the third message is used to request to release the first cell or the first cell group under the first carrier combination; A processing module is used to determine the first message.

47. The device according to claim 46, characterized in that When the third message is used to request the release of the first cell, the third message also indicates that the frequency band corresponding to the first cell is affected; or, when the third message is used to request the release of the first cell group, the third message also indicates that the frequency band corresponding to the main cell in the first cell group is affected.

48. The device according to claim 46 or 47, characterized in that The third message includes identification information of the first cell and an index of a frequency band corresponding to the first cell; or, the third message includes identification information of the first cell group and an index of a frequency band corresponding to a primary cell in the first cell group.

49. The device according to any one of claims 46 to 48, characterized in that The carrier combination currently configured by the terminal device is changed from the first carrier combination to the second carrier combination, and the third message becomes invalid.

50. The device according to any one of claims 46 to 49, characterized in that The transceiver module is also used for: Receive indication information from the terminal device, where the indication information is used to indicate that the third message is invalid.

51. A communication device, characterized in that: comprising a processor for executing one or more computer programs or instructions so that the method according to any one of claims 1 to 7 is executed by the communication device, or the method according to any one of claims 8 to 14 is executed by the communication device, or the method according to any one of claims 15 to 20 is executed by the communication device, or the method according to any one of claims 21 to 25 is executed by the communication device.

52. A communication system, characterized in that: The method comprises a first communication device and a second communication device, wherein the first communication device is used to execute the method as described in any one of claims 1 to 7, and the second communication device is used to execute the method as described in any one of claims 8 to 14; or, the first communication device is used to execute the method as described in any one of claims 15 to 20, and the second communication device is used to execute the method as described in any one of claims 21 to 25.

53. A computer-readable storage medium, characterized in that: A computer program or instruction is stored, wherein the computer program or instruction is used to implement the method according to any one of claims 1 to 7, or to implement the method according to any one of claims 8 to 14, or to implement the method according to any one of claims 15 to 20, or to implement the method according to any one of claims 21 to 25.

54. A computer program product, characterized in that The computer program product comprises a computer program, which, when executed on a computer, enables the method according to any one of claims 1 to 7 to be executed by the computer, or enables the method according to any one of claims 8 to 14 to be executed by the computer, or enables the method according to any one of claims 15 to 20 to be executed by the computer, or enables the method according to any one of claims 21 to 25 to be executed by the computer.

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